JP2010072031A - Color filter ink, color filter, image display device, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet color filter ink which can be stably and suitably used to manufacture color filters in which color unevenness and density unevenness among parts thereof are suppressed and which have excellent durability and excellent characteristic uniformity among individuals. <P>SOLUTION: The color filter ink used to manufacture a color filter by an inkjet method includes a colorant, a liquid medium in which the colorant is dissolved and/or dispersed, and a resin material. If butyl rubber is left still in the liquid medium sealed in an environment at 40°C under atmospheric pressure for 15 days, a swelling rate of the butyl rubber is ≤35%. The liquid medium, e.g., has an alkoxyl group or an acetyl group at both ends of a molecular chain and further has at least one ether oxygen atom within a molecule. The resin material contains a polymer W represented by formula (17), wherein a, b, c and d each independently represent an integer of ≥1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a color filter ink, a color filter, an image display device, and an electronic apparatus.

In general, a color filter is used in a liquid crystal display (LCD) or the like that performs color display.
A color filter has conventionally formed a coating film composed of a material (coloring layer forming composition) containing a colorant, a photosensitive resin, a functional monomer, a polymerization initiator, etc. on a substrate, and then a photomask. It has been manufactured by using a so-called photolithography method in which a photosensitive process, a developing process, and the like are performed. In such a method, the colors are usually overlapped by repeating the operation of forming a coating film corresponding to each color on almost the entire surface of the substrate, curing only a part thereof, and removing most of the other part. Manufacture color filters so that they do not match. For this reason, only a part of the coating film formed in the production of the color filter remains as a colored layer in the finally obtained color filter, and most of it is removed in the production process. Become. For this reason, not only the manufacturing cost of the color filter increases, but also from the viewpoint of resource saving.

  On the other hand, in recent years, a method for forming a colored layer of a color filter using a droplet discharge device provided with an inkjet head (droplet discharge head) has been proposed (for example, see Patent Document 1). In such a method, the discharge position of the droplets of the colored layer forming material (colored layer forming composition) can be easily controlled and waste of the colored layer forming composition can be reduced. The manufacturing cost can also be suppressed. However, in the method of manufacturing a color filter using a droplet discharge device equipped with an inkjet head, the droplet discharge amount becomes unstable if droplet discharge is performed for a long time or droplets are continuously discharged. In some cases, the trajectory of the discharged droplet changes (so-called flight curve occurs), and the droplet cannot land on the target site. When such a problem occurs, a plurality of types of inks used to form colored portions of different colors may be mixed (mixed) on the substrate on which the droplets are to be landed, or may be the same in nature. Variations in color density between multiple colored parts that are required to have a color density occur, resulting in color unevenness, density unevenness, etc. in each part of the color filter. If the characteristics (particularly color characteristics such as contrast ratio and color reproduction range) vary among a large number of color filters, the reliability of the color filter becomes low. In addition, the droplet discharge device (industrial use) used for manufacturing the color filter is completely different from that applied to the printer (consumer use). For example, mass production or large work (substrate) is performed. Therefore, it is required to eject a large amount of droplets for a long time. In general, ink used for droplet ejection devices (industrial use) applied to the manufacture of color filters (color filter inks) has a viscosity higher than that used for printers (consumer use). Since the load is high and the specific gravity is large, the load applied to the droplet discharge device is much larger than that of a consumer printer. Because it is used under such severe conditions, in the production of color filters by the conventional ink jet method, the components (parts) of the droplet discharge device are rapidly deteriorated, and parts are replaced or repaired at a relatively high frequency. There was a need to do. When replacing or repairing parts, it is necessary to adjust the droplet discharge conditions (for example, voltage waveform adjustment) again in order to suppress variations in characteristics among the many color filters that are manufactured. This has been a factor in reducing the productivity of color filters.

Further, in order to ensure a wider color gamut in the color filter, in recent years, there is a tendency to use a high colorant content as the color filter ink, but the higher the colorant content, The problem that the ejection stability of the droplet as described above is lowered becomes more remarkable.
Further, relatively strong light from a light source such as a backlight is incident on the color filter when it is used (when an image is displayed). For this reason, the color filter is required to have excellent light resistance, and also to have excellent heat resistance in order to cope with a temperature change accompanying incident light.

JP 2002-372613 A

  An object of the present invention is to stably and suitably use for the production of a color filter that suppresses uneven color and density unevenness at each site, is excellent in durability, and has excellent uniformity of characteristics among individuals. Ink-jet color filter inks that can be used, color unevenness and density unevenness in each part are suppressed, and excellent in durability and uniformity in characteristics among individuals It is another object of the present invention to provide a filter and to provide an image display device and an electronic device provided with the color filter.

これにより、各部位での色むら、濃度むら等が抑制され、かつ、耐久性にも優れるとともに、個体間での特性の均一性に優れたカラーフィルターの製造に安定的に好適に用いることができる、インクジェット方式のカラーフィルター用インクを提供することができる。 Such an object is achieved by the present invention described below.
The color filter ink of the present invention is a color filter ink used for producing a color filter by an inkjet method,
A colorant, a liquid medium in which the colorant is dissolved and / or dispersed, and a resin material,
In the sealed liquid medium, the swelling rate of the butyl rubber when the butyl rubber is allowed to stand in an environment of 40 ° C. under atmospheric pressure for 15 days is 35% or less,
The liquid medium includes those having an alkoxyl group or an acetyl group at both ends of the molecular chain, and further having at least one ether oxygen atom in the molecule,
The resin material is a monomer component w1 represented by the following formula (1), a monomer component w2 represented by the following formula (2), and a monomer component w3 represented by the following formula (3): It includes a polymer W containing a monomer component w4 represented by the following formula (4).

As a result, color unevenness, density unevenness, etc. in each part are suppressed, and it is excellent in durability and can be stably and suitably used for producing a color filter excellent in uniformity of characteristics among individuals. An ink jet color filter ink that can be provided can be provided.

In the color filter ink of the present invention, the content of the monomer component w1 in the total components constituting the polymer W is 25 to 75 wt%,
The content of the monomer component w2 in the total components constituting the polymer W is 2 to 25 wt%,
The content rate of the monomer component w3 in the total components constituting the polymer W is 5 to 50 wt%,
It is preferable that the content of the monomer component w4 in the total components constituting the polymer W is 3 to 40 wt%.

  As a result, it is possible to effectively prevent the deterioration or the like of the constituent members (parts) of the droplet discharge device that discharges the color filter ink, and the trajectory of the droplet discharged from the droplet discharge device changes (so-called). This effectively prevents problems such as the occurrence of flying bends), the inability to land droplets on the target site, and the instability of the droplet ejection amount (unstabilized droplet ejection). In addition, it is possible to more effectively prevent unintentional irregularities from occurring on the surface of the colored portion formed using the color filter ink, and each part of the produced color filter. Color unevenness, density unevenness, etc. can be more effectively prevented, and the uniformity of characteristics among individuals can be made particularly excellent. Further, the hardness of the colored portion to be formed and the adhesion to the substrate can be made particularly excellent, and the durability (light resistance, heat resistance, etc.) of the produced color filter can be made particularly excellent. In addition, the resin material has a particularly excellent characteristic (switching characteristic) that allows the curing reaction to proceed efficiently at a temperature higher than that at a predetermined temperature and substantially does not proceed with the curing reaction. When the color filter ink contains a pigment as a colorant, the dispersion stability of the pigment in the color filter ink can be made particularly excellent. For this reason, the long-term storage stability of the color filter ink can be made particularly excellent.

これにより、製造されるカラーフィルターの各部位での色むら、濃度むら等をより効果的に防止することができる。また、カラーフィルター用インクが、着色剤として顔料を含む場合においては、カラーフィルター用インク中における顔料の分散安定性（カラーフィルター用インクの長期保存性）を特に優れたものとすることができる。 In the color filter ink of the present invention, in addition to the polymer W, the resin material further includes at least a monomer component x1 represented by the following formula (5) and a single amount represented by the following formula (6). It is preferable that the polymer X contains a body component x2, a monomer component x3 represented by the following formula (7), and a monomer component x4 represented by the following formula (8).

Thereby, color unevenness, density unevenness and the like at each part of the manufactured color filter can be more effectively prevented. Further, when the color filter ink contains a pigment as a colorant, the dispersion stability of the pigment in the color filter ink (long-term storage stability of the color filter ink) can be made particularly excellent.

これにより、カラーフィルター用インクを吐出する液滴吐出装置の構成部材（部品）の劣化等を効果的に防止することができ、液滴吐出装置から吐出された液滴の軌道が変化し（いわゆる、飛行曲がりが発生し）、目的の部位に液滴を着弾させることができなくなったり、液滴の吐出量が不安定化する等の問題（液滴吐出の不安定化）を効果的に防止することができ、また、カラーフィルター用インクを用いて形成される着色部の表面に不本意な凹凸が生じてしまうのをより効果的に防止することができ、製造されるカラーフィルターの各部位での色むら、濃度むら等をより効果的に防止し、個体間での特性の均一性を特に優れたものとすることができる。また、形成される着色部の硬度、基板に対する密着性を特に優れたものとし、製造されるカラーフィルターの耐久性（耐光性、耐熱性等）を特に優れたものとすることができる。また、樹脂材料についての、所定温度以下では実質的に硬化反応を進行させず、それ以上の温度で効率よく硬化反応を進行させることができる特性（スイッチング特性）を特に優れたものとし、さらに、カラーフィルター用インクが、着色剤として顔料を含む場合においては、カラーフィルター用インク中における顔料の分散安定性を特に優れたものとすることができる。このようなことから、カラーフィルター用インクの長期保存性を特に優れたものとすることができる。 In the color filter ink of the present invention, in addition to the polymer W, the resin material further includes at least a monomer component y1 represented by the following formula (9) and a single amount represented by the following formula (10). It is preferable that the polymer Y contains the body component y2.

As a result, it is possible to effectively prevent the deterioration or the like of the constituent members (parts) of the droplet discharge device that discharges the color filter ink, and the trajectory of the droplet discharged from the droplet discharge device changes (so-called). This effectively prevents problems such as the occurrence of flying bends, the inability to land droplets on the target site, and the instability of the droplet ejection volume (unstabilized droplet ejection). In addition, it is possible to more effectively prevent unintentional irregularities from occurring on the surface of the colored portion formed using the color filter ink, and each part of the manufactured color filter. Color unevenness, density unevenness, etc. can be more effectively prevented, and the uniformity of characteristics among individuals can be made particularly excellent. Further, the hardness of the colored portion to be formed and the adhesion to the substrate can be made particularly excellent, and the durability (light resistance, heat resistance, etc.) of the produced color filter can be made particularly excellent. In addition, the resin material has a particularly excellent characteristic (switching characteristic) that allows the curing reaction to proceed efficiently at a temperature higher than that at a predetermined temperature and substantially does not proceed with the curing reaction. When the color filter ink contains a pigment as a colorant, the dispersion stability of the pigment in the color filter ink can be made particularly excellent. For this reason, the long-term storage stability of the color filter ink can be made particularly excellent.

これにより、製造されるカラーフィルターの各部位での色むら、濃度むら等をより効果的に防止し、個体間での特性の均一性を特に優れたものとすることができるとともに、形成される着色部の基板に対する密着性を特に優れたものとし、製造されるカラーフィルターの耐久性（耐光性、耐熱性等）を特に優れたものとすることができる。また、カラーフィルター用インクが、着色剤として顔料を含む場合においては、カラーフィルター用インク中における顔料の分散安定性（カラーフィルター用インクの長期保存性）を特に優れたものとすることができる。 In the color filter ink of the present invention, in addition to the polymer W, the resin material further includes at least a monomer component z1 represented by the following formula (11) and a single quantity represented by the following formula (12). It is preferable that it contains the polymer Z containing the body component z2 and the monomer component z3 represented by the following formula (13).

Thereby, it is possible to more effectively prevent color unevenness, density unevenness, etc. in each part of the produced color filter, and to make the uniformity of characteristics among individuals particularly excellent and formed. The adhesion of the colored portion to the substrate can be made particularly excellent, and the durability (light resistance, heat resistance, etc.) of the produced color filter can be made particularly excellent. Further, when the color filter ink contains a pigment as a colorant, the dispersion stability of the pigment in the color filter ink (long-term storage stability of the color filter ink) can be made particularly excellent.

The color filter ink of the present invention contains a pigment as the colorant,
Furthermore, it is preferable that the dispersant contains an acid value dispersant having a predetermined acid value and an amine value dispersant having a predetermined amine value.
As a result, the trajectory of the droplet ejected from the droplet ejection device changes (so-called flight bending occurs), and the droplet cannot be landed on the target site, or the amount of ejected droplet is ineffective. It can effectively prevent problems such as stabilization (instability of droplet ejection), and more effectively prevent color unevenness and density unevenness at each part of the manufactured color filter. The uniformity of characteristics among individuals can be made particularly excellent. Further, the dispersion stability of the pigment in the color filter ink (long-term storage stability of the color filter ink) can be made particularly excellent.

In the color filter ink of the present invention, the colorant contains a pigment,
The pigment is C.I. I. Pigment Green 58 is preferably included, and a sulfonated pigment derivative is preferably included as a secondary pigment.
C. I. Although Pigment Green 58 has a feature of excellent brightness, conventionally, it has been an extremely difficult material to stably disperse in color filter inks. Conventionally, the color filter ink used in the ink jet system is C.I. I. When the pigment green 58 is included, there is a problem that the discharge stability of the droplet is remarkably lowered. On the other hand, according to the present invention, it is difficult to stably disperse C.I. I. Even in the case of CI Pigment Green 58, the long-term dispersion stability of the pigment in the color filter ink can be made particularly excellent, and the droplet ejection stability can also be made excellent. That is, C.I. I. By including the pigment green 58, the effect of the present invention is more remarkably exhibited.

In the color filter ink of the present invention, the liquid medium may have at least two ether oxygen atoms in the molecule in addition to the alkoxyl group or acetyl group provided at both ends of the molecular chain. preferable.
This effectively prevents deterioration of the components (parts) of the droplet discharge device that discharges the color filter ink, and allows the manufactured color filter to have higher quality and individual characteristics. It can be excellent in uniformity.

In the color filter ink of the present invention, the liquid medium preferably has a linear molecular structure having no side chain.
This effectively prevents deterioration of the components (parts) of the droplet discharge device that discharges the color filter ink, and allows the manufactured color filter to have higher quality and individual characteristics. It can be excellent in uniformity.

The color filter ink of the present invention is used in a droplet discharge device in which a connection member that connects a liquid supply tube for supplying the color filter ink and an inkjet head for discharging droplets is composed of the butyl rubber. It is preferable that
This effectively prevents deterioration of the components (parts) of the droplet discharge device that discharges the color filter ink, and allows the manufactured color filter to have higher quality and individual characteristics. It can be excellent in uniformity.

In the color filter ink of the present invention, the fluorosilicone rubber has a swelling ratio of 10 when the fluorosilicone rubber is allowed to stand for 15 days in an environment of 40 ° C. under atmospheric pressure in the sealed liquid medium. % Or less is preferable.
As a result, it is possible to effectively prevent deterioration of the constituent members (parts) of the droplet discharge device that discharges the color filter ink, clogging in the droplet discharge head, etc. It is possible to achieve higher quality and excellent uniformity of characteristics among individuals.

The color filter of the present invention is manufactured using the color filter ink of the present invention.
As a result, it is possible to provide a color filter that suppresses color unevenness, density unevenness, and the like at each site, is excellent in durability, and has excellent uniformity of characteristics among individuals.
An image display device according to the present invention includes the color filter according to the present invention.
As a result, it is possible to provide an image display device that suppresses uneven color, uneven density, and the like in each part of the display unit, is excellent in durability, and has excellent uniformity of characteristics among individuals.

The image display device of the present invention is preferably a liquid crystal panel.
As a result, it is possible to provide an image display device that suppresses uneven color, uneven density, and the like in each part of the display unit, is excellent in durability, and has excellent uniformity of characteristics among individuals.
An electronic apparatus according to the present invention includes the image display device according to the present invention.
As a result, it is possible to provide an electronic device that suppresses uneven color, uneven density, and the like in each part of the display unit, is excellent in durability, and is excellent in uniformity of characteristics among individuals.

Hereinafter, preferred embodiments of the present invention will be described in detail.
《Color filter ink》
The color filter ink of the present invention is an ink used for the production of a color filter (formation of a colored portion of a color filter), and is particularly used for the production of a color filter by an ink jet method.
The color filter ink includes a colorant, a liquid medium in which the colorant is dissolved and / or dispersed, a resin material, and the like.

<Colorant>
The color filter usually has different colored portions (generally, three colors corresponding to RGB). The colorant is usually selected according to the color tone of the colored portion to be formed. As a colorant constituting the color filter ink, for example, various pigments and various dyes can be used.

  Examples of the pigment include C.I. I. Pigment Red 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 21, 21, 22, 23, 30, 31, 32, 37, 38, 40, 41, 42, 48: 1, 48: 2, 48: 3, 48: 4, 49: 1, 49: 2, 50: 1, 52: 1, 53: 1, 57, 57: 1, 57: 2, 58: 2, 58: 4, 60: 1, 63: 1, 63: 2, 64: 1, 81, 81: 1, 83, 88, 90: 1, 97, 101, 102, 104, 105, 106, 108, 108: 1, 112, 113, 114, 122, 123, 144, 146, 149, 150, 151, 166, 168, 170, 171, 172, 174, 175, 176, 177, 178, 179, 180, 185, 187, 188, 190, 193 194,202,206,207,208,209,215,216,220,224,226,242,243,245,254,255,264,265; C. I. Pigment Green 7, 36, 15, 17, 18, 19, 26, 50, 58; I. Pigment blue 1,15,15: 1,15: 2,15: 3,15: 4,15: 6, 17: 1,18,60,27,28,29,35,36,60,80; I. Pigment Yellow 1, 3, 12, 13, 14, 15, 16, 17, 20, 24, 31, 34, 35, 35: 1, 37, 37: 1, 42, 43, 53, 55, 60, 61, 65, 71, 73, 74, 81, 83, 93, 94, 95, 97, 98, 100, 101, 104, 106, 108, 109, 110, 113, 114, 116, 117, 119, 120, 126, 127, 128, 129, 138, 139, 150, 151, 152, 153, 154, 155, 156, 157, 166, 168, 175, 180, 184, 185; I. Pigment violet 1, 3, 14, 16, 19, 23, 29, 32, 36, 38, 50; C.I. I. Pigment Orange 1, 5, 13, 14, 16, 17, 20, 20: 1, 24, 34, 36, 38, 40, 43, 46, 49, 51, 61, 63, 64, 71, 73, 104; C. I. Pigment brown 7, 11, 23, 25, 33; I. Pigment Black 1 and 7 and derivatives thereof may be used, and one or more selected from these may be used in combination.

  When the color filter ink is one containing a pigment as a colorant (pigment ink), the light filter and the heat resistance of the produced color filter are superior to those containing a dye as a colorant (dye ink). Can be. Conventionally, when the color filter ink contains a pigment, the droplet discharge stability is particularly low. In the color filter ink, the pigment is stably dispersed over a long period of time. Replacement of color filter ink for droplet ejection, replacement of color filter ink in the droplet ejection device is difficult, and it is difficult to stably produce color filters with excellent contrast etc. over a long period of time It is difficult to sufficiently increase the productivity of the color filter because it is necessary to frequently perform the color filter, and the characteristic difference between the lots of the color filter to be manufactured easily occurs due to the replacement or replacement of the color filter ink. However, in the present invention, as described in detail later, a pigment is used as a colorant. , It is possible to reliably prevent the occurrence of the above problems. That is, when a pigment is used as the colorant, the effect of the present invention is more remarkably exhibited.

  Among the above pigments, the color filter ink is C.I. I. Pigment red 254, C.I. I. Pigment red 177, C.I. I. Pigment green 58, C.I. I. Pigment blue 15: 6, C.I. I. Pigment violet 23, C.I. I. It is preferable to include one or more selected from the group consisting of CI Pigment Yellow 150 and derivatives thereof.

In particular, the color filter ink is used as a pigment (red pigment) as C.I. I. Pigment red 177 and its derivatives, and / or C.I. I. When the pigment red 254 and derivatives thereof are included, the color developability of the color filter ink (red color filter ink) can be made particularly excellent. In addition, the effects of using in combination with a dispersant and a resin material, which will be described in detail later, are more prominently exhibited. It can be particularly excellent.
C. I. Pigment Red 177 derivatives, C.I. I. When the pigment red 254 derivative contains a compound (derivative) represented by the following formula (14) or the following formula (15), the above-described effects are more remarkably exhibited.

  In particular, the color filter ink is used as a pigment (green pigment). I. When it contains CI Pigment Green 58 (brominated zinc phthalocyanine pigment), the color developability of the color filter ink (green color filter ink) can be made particularly excellent. In addition, C.I. I. Although Pigment Green 58 has a feature of excellent lightness, it has been a material that has been extremely difficult to stably disperse in the past, but the present inventor has stably dispersed in the past. C. was extremely difficult. I. It has been found that even when Pigment Green 58 is included, long-term dispersion stability in a color filter ink can be made particularly excellent by using in combination with a resin material as will be described in detail later. The color filter ink is C.I. I. When pigment green 58 is included, it is preferable to further include a sulfonated pigment derivative as a sub-pigment. As a result, the color developing properties of the color filter ink can be further improved, the pigment dispersion stability in the color filter ink (long-term storage stability of the color filter), and the ejection stability of the color filter ink. Can be made particularly excellent.

  As a pigment, C.I. I. When the pigment green 58 and the sulfonated pigment derivative are included, the sulfonated pigment derivative preferably contains a compound (derivative) represented by the following formula (16). As a result, the long-term dispersion stability of the pigment particles in the color filter ink and the ejection stability of the droplets can be made particularly excellent, and an image with better contrast can be displayed on the manufactured color filter. can do. Further, in the method as described later, the efficiency of the fine dispersion step can be made particularly excellent, and the color filter ink can be produced in a short time and with relatively small energy. The productivity of the filter ink can be made particularly excellent, which can contribute to the reduction of the production cost.

In this way, a pigment derivative (sub-pigment) having a specific chemical structure is converted into C.I. I. By using together with Pigment Green 58 (main pigment), the above-mentioned excellent effect is obtained as a result of intensive studies by the present inventors, and details of the mechanism are unknown. However, it is thought that this is due to the following reasons.
C. I. The brominated phthalocyanine constituting the pigment green 58 has a highly conjugated system as a whole molecule, and has a planar structure, which is stable in terms of energy. The brominated phthalocyanine is placed in a stable state in which the conjugated π electrons between the molecules overlap each other by arranging (parallel) the planar molecules. For this reason, C.I. I. Pigment Green 58 inherently tends to agglomerate and is difficult to stably disperse in a liquid medium.

  On the other hand, in the pigment derivative as described above, the hydrogen atom bonded to the nitrogen atom in the formula (16) forms a hydrogen bond with the oxygen atom constituting the phthalimide structure. For this reason, the hydrogen atom bonded to the nitrogen atom in formula (16) is substantially bonded to the oxygen atom constituting the phthalimide structure together with the nitrogen atom constituting the quinoline structure. In the pigment derivative (sulfonated pigment derivative) as described above, a stable ring structure (7-membered ring structure) with 7 atoms numbered 1 to 7 in the formula (16) is formed. By forming such a seven-membered ring structure, the plane due to the quinoline structure and the plane due to the phthalimide structure are in a non-parallel state.

  In this way, the plane due to the quinoline structure and the plane due to the phthalimide structure are non-parallel, so that C.I. I. Pigment derivatives (sulfonated pigment derivatives) having moderate affinity for CI Pigment Green 58 (brominated phthalocyanine) are disclosed in C.I. I. Pigment Green 58 enters between the molecules, and as described above, C. I. It is possible to make the pigment green 58 difficult to aggregate. Furthermore, since the above pigment derivatives (sulfonated pigment derivatives) have a sulfo group in the molecule, they are excellent in dispersibility in a liquid medium described later. The above is considered to act synergistically and to obtain the very excellent effects as described above.

  C. I. When the pigment green 58 and the pigment derivative (sulfonated pigment derivative) as described above are included, the content of the pigment derivative (sulfonated pigment derivative) in the color filter ink is not particularly limited. I. Pigment Green 58 (main pigment): It is preferably 2 to 32 parts by weight, more preferably 7 to 28 parts by weight with respect to 100 parts by weight. Thereby, the long-term dispersion stability of the pigment particles in the color filter ink and the discharge stability of the droplets can be made particularly excellent, and the contrast of the color filter manufactured using the color filter ink, The brightness can be made particularly excellent.

  In particular, the color filter ink is used as a pigment (blue pigment). I. Pigment blue 15: 6, C.I. I. Pigment violet 23 or C.I. I. When the pigment blue 15 derivative is included, the color developability of the color filter ink (blue color filter ink) can be made particularly excellent. Further, the long-term dispersion stability of the pigment particles in the color filter ink and the discharge stability of the color filter ink can be made particularly excellent.

  When the color filter ink is a pigment containing a pigment as a colorant (pigment ink), the average particle diameter of the pigment is preferably 10 to 200 nm, and more preferably 20 to 180 nm. As a result, the durability (light resistance) of the color filter manufactured using the color filter ink while sufficiently improving the dispersion stability of the pigment in the color filter ink and the discharge stability of the color filter ink. Etc.) can be made sufficiently excellent, and the color developability, contrast, etc. in the color filter can be made particularly excellent.

  Examples of the dye include azo dyes, anthraquinone dyes, condensed polycyclic aromatic carbonyl dyes, indigoid dyes, carbonium dyes, phthalocyanine dyes, methine, and polymethine dyes. Specific examples of the dye include C.I. I. Direct Red 2, 4, 9, 23, 26, 28, 31, 39, 62, 63, 72, 75, 76, 79, 80, 81, 83, 84, 89, 92, 95, 111, 173, 184 207, 211, 212, 214, 218, 221, 223, 224, 225, 226, 227, 232, 233, 240, 241, 242, 243, 247; I. Acid Red 35, 42, 51, 52, 57, 62, 80, 82, 111, 114, 118, 119, 127, 128, 131, 143, 145, 151, 154, 157, 158, 211, 249, 254 257, 261, 263, 266, 289, 299, 301, 305, 319, 336, 337, 361, 396, 397; I. Reactive Red 3, 13, 17, 19, 21, 22, 23, 24, 29, 35, 37, 40, 41, 43, 45, 49, 55; I. B. Basic Red 12, 13, 14, 15, 18, 22, 23, 24, 25, 27, 29, 35, 36, 38, 39, 45, 46; I. Direct violet 7, 9, 47, 48, 51, 66, 90, 93, 94, 95, 98, 100, 101; I. Acid Violet 5, 9, 11, 34, 43, 47, 48, 51, 75, 90, 103, 126; I. Reactive violet 1,3,4,5,6,7,8,9,16,17,22,23,24,26,27,33,34; I. B. Basic violet 1, 2, 3, 7, 10, 15, 16, 20, 21, 25, 27, 28, 35, 37, 39, 40, 48; I. Direct yellow 8, 9, 11, 12, 27, 28, 29, 33, 35, 39, 41, 44, 50, 53, 58, 59, 68, 87, 93, 95, 96, 98, 100, 106, 108, 109, 110, 130, 142, 144, 161, 163; I. Acid Yellow 17, 19, 23, 25, 39, 40, 42, 44, 49, 50, 61, 64, 76, 79, 110, 127, 135, 143, 151, 159, 169, 174, 190, 195 196, 197, 199, 218, 219, 222, 227; I. Reactive Yellow 2, 3, 13, 14, 15, 17, 18, 23, 24, 25, 26, 27, 29, 35, 37, 41, 42; I. Basic yellow 1, 2, 4, 11, 13, 14, 15, 19, 21, 23, 24, 25, 28, 29, 32, 36, 39, 40; I. Acid Green 16; C.I. I. Acid Blue 9, 45, 80, 83, 90, 185; C.I. I. Basic oranges 21, 23 and the like can be mentioned, and one or more selected from these can be used in combination.

  The content of the colorant in the color filter ink is preferably 2 to 25 wt%, and more preferably 3 to 20 wt%. When the content of the colorant is a value within the above range, the discharge property (discharge stability) from the droplet discharge head (inkjet head) for the color filter is particularly excellent, and the produced color filter The durability can be improved. Further, a sufficient color density can be secured in the manufactured color filter. Further, the amount of color filter ink required to form a colored portion having a predetermined color density can be reduced, which is advantageous from the viewpoint of resource saving. Moreover, since the volatilization amount of the liquid medium when forming the colored portion of the color filter can be suppressed, the burden on the environment can be reduced.

<Liquid medium>
The liquid medium (liquid medium) has a function of dissolving and / or dispersing the colorant as described above. That is, the liquid medium functions as a solvent and / or a dispersion medium. In general, most of the liquid medium is removed in the process of manufacturing the color filter.

  By the way, in a liquid droplet ejection apparatus that performs liquid droplet ejection by an ink jet method, a liquid droplet ejection head (inkjet head) is generally connected to a tube (liquid feeding tube) that feeds ink. In general, the connection between the droplet discharge head and the tube is made via a connection member made of a material having excellent stretchability. And as a constituent material of the connecting member, butyl rubber having characteristics such as rich stretchability, low gas permeability, excellent vibration proof property, water resistance, acid resistance, alkali resistance, weather resistance, etc. is widely used. Yes. However, even when using a droplet discharge device equipped with a connecting member made of butyl rubber, conventional color filter inks meet the recent demand for higher performance (higher image quality). It is difficult to make the characteristic difference between individuals sufficiently small, especially when a large number of color filters are manufactured, the characteristic difference between individuals is sufficiently small. It was difficult. Although the detailed mechanism for causing such problems is unknown, when conventional color filter ink is used, even if liquid leakage in the vicinity of the connection member is prevented, bubbles are taken in from the vicinity of the connection member. This is probably because the ejection characteristics of the color filter ink are affected. Therefore, the present inventor has conducted intensive research for the purpose of solving the above problems. As a result, it has been found that the above-mentioned problems can be solved by using a liquid medium as described below and using a resin material as described in detail later.

  The color filter ink of the present invention has, as a liquid medium, an alkoxyl group or an acetyl group at both ends of a molecular chain, and at least one ether oxygen atom in the molecule. Including those that satisfy That is, a swelling rate indicating an increase in the weight of butyl rubber when the butyl rubber is allowed to stand in a sealed liquid medium at 40 ° C. under atmospheric pressure for 15 days (hereinafter also referred to as “swelling rate of butyl rubber”). .) Is 35% or less. By satisfying such a condition, in the production of a color filter using an inkjet method, even if droplet discharge is performed for a long period of time, the conditions such as the droplet discharge amount can be stabilized, and the long-term A stable quality color filter can be manufactured. That is, color unevenness, density unevenness and the like in each part are suppressed, and a color filter excellent in uniformity of characteristics among individuals can be stably manufactured over a long period of time. Further, by satisfying the above conditions, it is possible to effectively prevent the constituent members (parts) of the droplet discharge device used for droplet discharge from deteriorating. For this reason, even when a large number of color filters are manufactured, the frequency of maintenance such as replacement and repair of components (parts) of the droplet discharge device can be reduced, so that the productivity of the color filter is excellent. Can be. Further, by using the liquid medium as described above, the solubility of the resin material, which will be described in detail later, in the color filter ink can be improved. In particular, even when an environmental change such as a temperature change occurs, the solubility of the resin material can be made excellent, and unintentional precipitation of the resin material or the resin material during storage of the color filter ink, etc. Can be reliably prevented. As a result, droplet discharge can be performed stably over a longer period of time, and the adhesion of the colored portion formed using the color filter ink to the substrate (color filter durability) is particularly excellent. It can be.

  On the other hand, if the swelling rate of butyl rubber is too high for liquid media, the droplet discharge conditions are unstable when droplets are discharged for a long period of time in the production of a color filter using an inkjet method. Therefore, it becomes difficult to sufficiently suppress uneven color and uneven density at each part of the manufactured color filter. In addition, when a large number of color filters are manufactured, variation in characteristics among individuals increases, making it difficult to stably manufacture color filters of excellent quality. The swelling rate of butyl rubber can be measured using, for example, a disk-shaped test piece having a diameter of 3 mm and a thickness of 2 mm made of solid butyl rubber.

As described above, in the present invention, the swelling rate of butyl rubber is 35% or less when the butyl rubber is allowed to stand in a sealed liquid medium at 40 ° C. for 15 days under atmospheric pressure. The swelling ratio of butyl rubber when left in the above environment is preferably 20% or less, and more preferably 10% or less. Thereby, the effect of the present invention as described above becomes more remarkable. The swelling ratio is [(w _A / w _B ], where w _B [g] is the weight before dipping in the liquid medium, and w _A [g] is the weight after the dipping treatment under the above conditions. ) -1] indicates a value (%) represented by x100.

  Further, if a liquid medium having the above chemical structure is not used (more specifically, the liquid medium has an alkoxy group at one end of the molecular chain and an acetyl group at the other end. In the case of a compound having an alkoxy group or an acetyl group at both ends of the molecular chain, but having a compound other than that having no ether oxygen) To sufficiently prevent the occurrence of adverse effects on members (parts), to improve the dissolution stability of the resin material described in detail later, and in the case of using a pigment as a colorant, the pigment in the color filter ink It becomes difficult to make the dispersion stability sufficiently excellent, and to make the viscosity and vapor pressure (hardness of volatilization) of the color filter ink suitable values. In the production of color filters using this method, when droplets are ejected for a long period of time, the droplet ejection conditions become unstable, and color unevenness, density unevenness, etc. are sufficient at each part of the produced color filter. It becomes difficult to suppress it. In addition, when a large number of color filters are manufactured, variation in characteristics among individuals increases, making it difficult to stably manufacture color filters of excellent quality.

  Examples of the compound having the above chemical structure and usable as a liquid medium include triethylene glycol dimethyl ether, triethylene glycol diacetate, bis (2-butoxyethyl) ether, tetraethylene glycol dimethyl ether, and dipropylene. Glycol dimethyl ether, diethylene glycol dimethyl ether, diethylene glycol ethyl methyl ether, diethylene glycol diethyl ether, triethylene glycol butyl methyl ether and the like can be mentioned, and one or more selected from these can be used in combination.

  The color filter ink of the present invention may be any liquid medium that has an alkoxyl group or an acetyl group at both ends of the molecular chain and further has at least one ether oxygen atom in the molecule. The liquid medium is preferably one having at least two ether oxygen atoms in the molecule in addition to the alkoxyl group or acetyl group provided at both ends of the molecular chain. As a result, it is possible to effectively prevent deterioration of the constituent members (parts) of the droplet discharge device that discharges the color filter ink, and the manufactured color filter has higher quality and individual characteristics. It can be excellent in uniformity. In addition to the alkoxyl group or acetyl group provided at both ends of the molecular chain, the compound having at least two ether oxygen atoms in the molecule (liquid medium) includes, for example, triethylene glycol dimethyl ether, triethylene glycol diester. Examples include acetate, tetraethylene glycol dimethyl ether, and triethylene glycol butyl methyl ether.

Further, the liquid medium preferably has a linear molecular structure having no side chain. This effectively prevents deterioration of the components (parts) of the droplet discharge device that discharges the color filter ink, and allows the manufactured color filter to have higher quality and individual characteristics. It can be excellent in uniformity. Examples of the compound having a linear molecular structure not having a side chain (liquid medium) include triethylene glycol dimethyl ether, triethylene glycol diacetate, bis (2-butoxyethyl) ether, tetraethylene glycol dimethyl ether, Examples include dipropylene glycol dimethyl ether, diethylene glycol dimethyl ether, diethylene glycol ethyl methyl ether, diethylene glycol diethyl ether, and triethylene glycol butyl methyl ether.
In the color filter ink of the present invention, the liquid medium may contain any compound as described above and may contain other components. However, in such a case, the content of the other components in the liquid medium is preferably 30 wt% or less, more preferably 25 wt% or less, and even more preferably 20 wt% or less. .

  In the present invention, the liquid medium preferably satisfies the following conditions. That is, the swelling rate of the fluorosilicone rubber when the fluorosilicone rubber is allowed to stand for 15 days in a sealed liquid medium at 40 ° C. under atmospheric pressure (hereinafter referred to as “swelling rate of the fluorosilicone rubber”). Is also preferably 10% or less, and more preferably 5% or less. Fluorosilicone rubber is a material generally used as a connection material for connecting an ink supply unit and a head drive portion in a head in a droplet discharge head (particularly in the vicinity of a nozzle plate) of a droplet discharge device as will be described later. However, if the fluorosilicone rubber swells in the droplet discharge device, the ink leaks to the outside and the ink supply capacity decreases, making it impossible to discharge properly, or the swollen member pieces are eluted. There is a possibility of causing problems such as clogging of the nozzle. In addition, the rubber component that dissolves into the color filter also causes the product characteristics to deteriorate. Therefore, by using such a liquid medium having a low swelling rate of fluorosilicone rubber, deterioration of components (parts) of a droplet discharge device that discharges color filter ink, or clogging in a droplet discharge head Etc. can be effectively prevented, and the manufactured color filter can have higher quality and excellent uniformity of characteristics among individuals. The swelling rate of the fluorosilicone rubber can be measured using, for example, a disk-shaped test piece having a diameter of 3 mm and a thickness of 2 mm made of solid fluorosilicone rubber.

  The boiling point of the liquid medium under atmospheric pressure (1 atm) is preferably 180 to 300 ° C, more preferably 190 to 290 ° C, and further preferably 230 to 280 ° C. When the boiling point of the liquid medium under atmospheric pressure is a value within the above range, clogging or the like in the droplet discharge head that discharges the color filter ink can be more effectively prevented, and the productivity of the color filter is improved. Can be made particularly excellent.

  The vapor pressure at 25 ° C. of the liquid medium is preferably 0.1 mmHg or less, and more preferably 0.05 mmHg or less. When the vapor pressure of the liquid medium is within the above range, it is possible to more effectively prevent clogging and the like in the droplet discharge head that discharges the color filter ink, and the color filter productivity is particularly excellent. Can be.

  The content of the liquid medium in the color filter ink is preferably 50 to 98 wt%, and more preferably 70 to 95 wt%. When the content of the liquid medium is a value within the above range, the durability of the produced color filter is excellent while the droplet discharge performance from the droplet discharge device for the color filter is particularly excellent. Can be. Further, a sufficient color density can be secured in the manufactured color filter.

<Resin material>
The color filter ink generally contains a resin material (binder resin) for the purpose of improving the adhesion of the formed colored portion to the substrate. In addition, the resin material is required to have solvent resistance in order to prevent adverse effects due to chemical application and cleaning in the subsequent step of the ink application step by the inkjet method. However, with conventional color filter inks, it has been difficult to sufficiently improve the durability of the color filter (colored portion). In addition, with conventional color filter inks, if a droplet is discharged for a long period of time or continuously discharged by an inkjet method, the discharge amount of the droplet becomes unstable or the discharged droplet The trajectory has changed (so-called flight bends occur), and problems such as the inability to land droplets on the target site may occur. When such a problem occurs, a plurality of types of inks used to form colored portions of different colors may be mixed (mixed) on the substrate on which the droplets are to be landed, or may be the same in nature. Variations in color density between multiple colored parts that are required to have a color density occur, resulting in color unevenness, density unevenness, etc. in each part of the color filter, Variations in characteristics (particularly color characteristics such as contrast ratio, color gamut, etc.) among a large number of color filters result in low color filter reliability. Such a problem becomes conspicuous particularly when a colored portion is formed by discharging droplets on a large substrate (for example, G5 or more), which causes a significant decrease in the productivity (yield) of the color filter. It was.

In order to solve the above problems, the present inventor has conducted intensive research. As a result, it has been found that the above-described problems can be solved by including a resin material as described in detail below together with the liquid medium described above in the color filter ink. Such an excellent effect is obtained by coexisting the above-mentioned liquid medium and the resin material described in detail below in the color filter ink, and includes only one of them. Cannot be obtained.
Hereinafter, the resin material (curable resin material) constituting the color filter ink of the present invention will be described in detail.
In the color filter ink of the present invention, the resin material is at least a monomer component w1 represented by the following formula (1), a monomer component w2 represented by the following formula (2), and the following formula (3). The polymer W containing the monomer component w3 represented and the monomer component w4 represented by following formula (4) is included.

[Polymer W]
The polymer W includes a monomer component w1 represented by the above formula (1), a monomer component w2 represented by the above formula (2), and a monomer component w3 represented by the above formula (3). And the monomer component w4 represented by the above formula (4). Examples of the polymer W include those represented by the following formula (17).

By including such a polymer W, even when droplets are ejected for a long period of time or when droplets are ejected continuously, the amount of ejected droplets becomes unstable or flight bending occurs. It is possible to reliably prevent the occurrence of problems such as This is presumably because the color filter ink containing the polymer W effectively prevents the liquid medium from adversely affecting the constituent members (parts) of the droplet discharge device. As described above, in the present invention, a liquid medium that does not adversely affect the constituent members (parts) of the droplet discharge device is used, but by using the polymer W together with this, a more stable droplet can be obtained. Discharging can be performed. In addition, by including the polymer W, it is possible to effectively prevent the occurrence of unintended irregularities on the surface of the colored portion formed using the color filter ink, and a pigment as a colorant. In the case where it contains, the dispersion state of the pigment in the colored portion can be improved. As described above, it is possible to more effectively prevent the occurrence of color unevenness and density unevenness and a decrease in contrast ratio in an image displayed using a color filter. Further, by including the polymer W, the resin material has a characteristic that allows the curing reaction to proceed efficiently at a temperature higher than that at a predetermined temperature (hereinafter referred to as “curing”). Also called “reaction switching characteristics”), and the hardness of the colored portion to be formed, etc., and when the color filter ink contains a pigment, the pigment in the color filter ink Dispersion stability can be made particularly excellent. As a result, the long-term storage stability of the color filter ink (the life of the color filter ink) is extremely excellent, and problems such as deterioration in quality due to the mass production of the color filter ink are generated. Since it is effectively prevented and the replacement frequency of the color filter ink can be reduced when the color filter is manufactured, the productivity of the color filter and the reliability of the manufactured color filter can be made excellent.
The polymer W may be substantially composed of a single compound, or may be a mixture of a plurality of types of compounds. However, when the polymer W is a mixture of a plurality of types of compounds, each compound contains monomer components w1, w2, w3, and w4.

(Monomer component w1)
The polymer W contains the monomer component w1 represented by the above formula (1) as a monomer component.
By containing such a monomer component w1 as a monomer component, the droplet ejection stability can be made sufficiently excellent, and the curing reaction of the resin material constituting the color filter ink The switching characteristics can be made excellent. In addition, by containing the monomer component w1 as the monomer component, when the color filter ink contains a pigment, the dispersion stability of the pigment particles can be improved, and the color filter ink The long-term storage stability and discharge stability can be improved. Moreover, by including the monomer component w1 as the monomer component, the hardness of the formed colored portion, the durability of the color filter, and the like can be made sufficiently excellent. In addition, the monomer component w1 is excellent in reactivity in a high-temperature environment in the polymer W, but has extremely excellent stability against mechanical force. For this reason, for example, even when it is subjected to the fine dispersion step described later together with the pigment, the modification and deterioration of the polymer W in this step are prevented, and the function of the polymer W is ensured in the color filter ink. It can be demonstrated.

  The content of the monomer component w1 in the polymer W (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 25 to 75 wt%, and 40 to 60 wt%. More preferably. When the content of the monomer component w1 in the polymer W is a value within the above range, the above-described effects can be achieved without inhibiting the functions of the monomer components w2, w3, and w4 described in detail later. It can be expressed more significantly. On the other hand, when the content of the monomer component w1 in the polymer W is less than the lower limit value, the effect of including the monomer component w1 may not be sufficiently exhibited. Further, when the content of the monomer component w1 in the polymer W is less than the lower limit value, the discharge stability of the color filter ink is lowered, or the colored portion formed using the color filter ink Transparency may be reduced. On the other hand, when the content rate of the monomer component w1 in the polymer W exceeds the upper limit, the content rates of the monomer components w2, w3, and w4 are relatively lowered, and these functions are not sufficiently exhibited. there is a possibility. In addition, when the content of the monomer component w1 in the polymer W exceeds the upper limit, the formed colored portion lacks appropriate flexibility and tends to be brittle, and is deformed into a substrate on which the colored portion is provided. In the case where (for example, thermal expansion, thermal contraction, etc.) occurs, the followability of the colored portion is lowered, and it becomes difficult to sufficiently improve the adhesion of the colored portion to the substrate or the like. In addition, when the polymer W is a mixture of a plurality of types of compounds, the weighted average value (weighted average value based on the weight ratio) for these compounds is adopted as the content value of the monomer component w1. can do. Moreover, when the polymer W is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component w1 at the content as described above.

(Monomer component w2)
The polymer W contains the monomer component w2 represented by the above formula (2) as a monomer component.
By containing such a monomer component w2 as a monomer component, it is possible to improve the wetting and spreading of the color filter ink on the substrate, and mixing of bubbles and the like is reliably prevented, A colored portion having excellent adhesion to the substrate can be suitably formed. In addition, when the color filter ink includes a pigment and a dispersant, by including the monomer component w2 as a monomer component, not only the dispersion stability of the pigment but also the dispersion stability of the dispersant can be obtained. It can be made particularly excellent. As a result, the pigment dispersion stability and the long-term storage stability of the color filter ink can be made particularly excellent, and the droplet ejection stability can be made good over a long period of time. As described above, it is possible to reliably prevent the occurrence of color unevenness, density unevenness, and the like at each portion of the color filter manufactured using the color filter ink.

  The content of the monomer component w2 in the polymer W (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 2 to 25 wt%, and 5 to 15 wt%. More preferably. When the content of the monomer component w2 in the polymer W is a value within the above range, without inhibiting the functions of the monomer component w1 and the monomer components w3 and w4 described in detail later, The effects as described above can be expressed more remarkably. On the other hand, when the content of the monomer component w2 in the polymer W is less than the lower limit value, the effect of including the monomer component w2 may not be sufficiently exhibited. On the other hand, when the content rate of the monomer component w2 in the polymer W exceeds the upper limit value, the content rates of the monomer components w1, w3, and w4 are relatively lowered, and these functions are not sufficiently exhibited. there is a possibility. In addition, when the content of the monomer component w2 in the polymer W exceeds the upper limit, the color filter ink from the nozzles becomes poor when the droplets are ejected by the inkjet method, and the ejection stability is deteriorated. Decreases and problems such as color unevenness easily occur. In addition, when the polymer W is a mixture of a plurality of types of compounds, the weighted average value (weighted average value based on the weight ratio) for these compounds is used as the content value of the monomer component w2. can do. Moreover, when the polymer W is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component w2 at the content rate described above.

(Monomer component w3)
The polymer W contains the monomer component w3 represented by the above formula (3) as a monomer component.
By containing the monomer component w3 in the polymer W, the content of gas (dissolved gas, bubbles present as microbubbles, etc.) in the color filter ink can be reduced more effectively. In addition, it is possible to effectively prevent deterioration of constituent members (parts) of the droplet discharge device for discharging the color filter ink, and to sufficiently improve the discharge stability of the color filter ink. . In addition, by including the monomer component w3 as the monomer component, the colored portion formed using the color filter ink is excellent in transparency (preventing a decrease in light transmittance due to the opacity of the resin material). In particular, the adhesion to the substrate is particularly excellent, and problems such as cracks are less likely to occur. Further, by containing the monomer component w3 as the monomer component, the chemical resistance, solvent resistance, and the like of the colored portion to be formed can be improved. Thus, after the colored portion forming step (curing step), chemical application and washing (especially washing with N-methyl-2-pyrrolidone, γ-butyrolactone, isopropyl alcohol, hydrochloric acid, aqueous sodium hydroxide, etc.), etc. Even when post-processing is performed, the occurrence of adverse effects due to these can be reliably prevented. Further, the monomer component w3 is colored in the polymer W, while the reactivity at a relatively low temperature (for example, 100 ° C. or less) is sufficiently low, like the monomer component w1 described above. Under a heating environment such as a heat treatment applied in the part forming step (curing step), sufficient reactivity is exhibited. For this reason, in the coloring part formation process (curing process) performed in a heating environment while reliably preventing unintentional reaction (polymerization reaction) of the resin material during storage of the color filter ink or in the ink application process described later. Can suitably advance the curing reaction (polymerization reaction) of the resin material. In addition, by containing the monomer component w3, when the colored part is formed, when the liquid medium is removed from the color filter ink applied on the substrate, the surface of the formed colored part is unwilling. Unevenness can be reliably prevented from occurring. In addition, by containing the monomer component w3 as a monomer component, for example, when the color filter ink contains a pigment, the dispersion stability of the pigment particles can be improved. The long-term storability and ejection stability of the ink for use can be improved.

  The content of the monomer component w3 in the polymer W (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 5 to 50 wt%, and 10 to 40 wt%. More preferably. When the content of the monomer component w3 in the polymer W is a value within the above range, without inhibiting the functions of the monomer components w1, w2 and the monomer component w4 described in detail later, The effects as described above can be expressed more remarkably. On the other hand, when the content of the monomer component w3 in the polymer W is less than the lower limit value, the effect of including the monomer component w3 may not be sufficiently exhibited. On the other hand, when the content rate of the monomer component w3 in the polymer W exceeds the upper limit value, the content rates of the monomer components w1, w2, and w4 are relatively lowered, and these functions are not sufficiently exhibited. there is a possibility. In addition, the colored portion formed using the color filter ink becomes too hard, and the tendency to follow the deformation of the substrate or the like accompanying a temperature change appears. In addition, when the polymer W is a mixture of a plurality of types of compounds, the weighted average value (weighted average value based on the weight ratio) for these compounds is adopted as the content value of the monomer component w3. can do. Moreover, when the polymer W is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component w3 at the above-described content.

(Monomer component w4)
The polymer W contains the monomer component w4 represented by the above formula (4) as a monomer component.
When the polymer W contains the monomer component w4, when the colored medium is formed, the liquid medium is removed from the color filter ink applied on the substrate. The thixotropic property and viscosity of the filter ink can be increased, and unintentional irregularities can be prevented from being generated on the surface of the formed colored portion, and the color filter manufactured using the color filter ink can be prevented. It is possible to reliably prevent the occurrence of color unevenness, density unevenness, and the like at each part.

  Moreover, when the monomer component w4 is contained as a monomer component, the hydrophobicity of the entire resin material can be suitably adjusted, and the resin material is composed of a plurality of types of polymers. (For example, in addition to the polymer W, when one or more selected from the group consisting of the polymer X, the polymer Y, and the polymer Z described in detail later are included) And compatibility can be made particularly excellent. As a result, the discharge stability of the color filter ink can be made particularly excellent, and the colored portion formed using the color filter ink has excellent transparency (light due to the opacity of the resin material). The decrease in transmittance is prevented), and the adhesion to the substrate is particularly excellent, and problems such as cracks are less likely to occur.

  The content of the monomer component w4 in the polymer W (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 3 to 40 wt%, and 5 to 30 wt%. More preferably. When the content of the monomer component w4 in the polymer W is a value within the above range, the above-described effects are more remarkable without inhibiting the functions of the monomer components w1, w2, and w3. Can be expressed. On the other hand, when the content of the monomer component w4 in the polymer W is less than the lower limit, the effect of including the monomer component w4 may not be sufficiently exhibited. On the other hand, when the content rate of the monomer component w4 in the polymer W exceeds the upper limit value, the content rates of the monomer components w1, w2, and w3 are relatively lowered, and these functions are not sufficiently exhibited. there is a possibility. On the other hand, if the content of the monomer component w4 in the polymer W exceeds the upper limit, the dispersion stability (long-term storage stability) of the pigment particles is lowered when the color filter ink contains a pigment. In addition, when the polymer W is a mixture of a plurality of types of compounds, the weighted average value (weighted average value based on the weight ratio) for these compounds is used as the content value of the monomer component w4. can do. Moreover, when the polymer W is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component w4 with the content as described above.

The polymer W may include monomer components (other monomer components) other than the above-described monomer components w1, w2, w3, and w4. Thereby, for example, the effect derived from the chemical structure of another monomer can be acquired, exhibiting the above characteristics.
When the polymer W contains other monomer components (monomer components other than the monomer components w1, w2, w3, and w4), the content of other monomer components in the polymer W ( When plural kinds of other monomer components are included, the sum of these contents) is preferably 15 wt% or less, and more preferably 10 wt% or less.

  The weight average molecular weight of the polymer W is preferably 5000 to 50000, and more preferably 6000 to 15000. As a result, it is possible to make the color filter ink stable over time (long-term storage stability), the discharge stability of the color filter ink, and the color filter productivity sufficiently. Furthermore, the flatness of the colored portion formed using the color filter ink can be made more reliable, and the occurrence of color unevenness in the image displayed using the color filter can be more effectively achieved. Can be prevented.

Moreover, it is preferable that the dispersion degree (weight average molecular weight Mw / number average molecular weight Mn) of the polymer W is 1-3.
As described above, in the present invention, the resin material constituting the color filter ink includes the polymer W, but may further include another resin component (polymer).
Examples of such a resin component (polymer) include polymer X, polymer Y, and polymer Z as described below.

[Polymer X]
The polymer X includes a monomer component x1 represented by the following formula (5), a monomer component x2 represented by the following formula (6), and a monomer component x3 represented by the following formula (7): And a monomer component x4 represented by the following formula (8). Examples of the polymer X include those represented by the following formula (18).

By including such a polymer X, the color filter while sufficiently improving the switching characteristics of the curing reaction as a whole resin material and the affinity and compatibility of each polymer component in the color filter ink. The solvent resistance of the colored portion formed using the ink for ink can be made particularly excellent, and the flatness of the surface of the colored portion formed can be made particularly high. As a result, it is possible to more reliably prevent color unevenness, density unevenness, contrast reduction, etc. at each part of the color filter manufactured using the color filter ink, and durability and reliability of the color filter. Can be made particularly excellent.
In addition, the polymer X may consist essentially of a single compound, or may be a mixture of a plurality of types of compounds. However, when the polymer X is a mixture of a plurality of types of compounds, each compound contains monomer components x1, x2, x3 and x4.

(Monomer component x1)
The polymer X contains the monomer component x1 represented by the formula (5) as a monomer component.
By containing such a monomer component x1 as a monomer component, an unintentional reaction (polymerization reaction) of the resin material can be reliably prevented during storage of the color filter ink or in the ink application process described later. On the other hand, in the colored part forming step (curing step) performed in a heating environment, the curing reaction (polymerization reaction) of the resin material can be suitably advanced. That is, by including the monomer component x1, the switching characteristics of the curing reaction for the resin material can be made particularly excellent. Further, by containing the monomer component x1 as the monomer component, for example, when the color filter ink contains a pigment, the dispersion stability of the pigment particles can be made particularly excellent. The long-term storage stability and ejection stability of the filter ink can be made particularly excellent. Moreover, the hardness etc. of the colored part formed can be made excellent by containing the monomer component x1 as a monomer component.

  The content of the monomer component x1 in the polymer X (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 30 to 90 wt%, and 40 to 80 wt%. More preferably. When the content of the monomer component x1 in the polymer X is a value within the above range, the above-described effects can be achieved without inhibiting the functions of the monomer components x2, x3, and x4 described in detail later. It can be expressed more significantly. On the other hand, if the content of the monomer component x1 in the polymer X is less than the lower limit value, the effect of including the monomer component x1 may not be sufficiently exhibited. On the other hand, when the content of the monomer component x1 in the polymer X exceeds the upper limit, the content of the monomer components x2, x3, and x4 is relatively lowered, and these functions are not sufficiently exhibited. there is a possibility. Further, the reaction rate of the polymer X at a high temperature decreases, and it becomes difficult to produce a color filter with sufficiently excellent productivity. In addition, when the polymer X is a mixture of plural kinds of compounds, the weighted average value (weighted average value based on the weight ratio) of these compounds is adopted as the content value of the monomer component x1. can do. Moreover, when the polymer X is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component x1 at the content as described above.

(Monomer component x2)
The polymer X contains the monomer component x2 represented by the above formula (6) as a monomer component.
Containing such a monomer component x2 as a monomer component (particularly, together with the monomer component x1 described above and the monomer component x3 described in detail later) can preserve the color filter ink. In the colored part formation process (curing process) performed in a heating environment while reliably preventing unintentional reaction (polymerization reaction) of the resin material in the ink application process or the like described later, the resin material curing reaction (polymerization) Reaction) can be suitably carried out. In particular, in the colored portion forming step (curing step) under a heating environment, the rising of the polymerization reaction of the resin material can be improved, and the polymerization reaction can be continuously advanced. Moreover, the hardness etc. of the colored part formed can be made excellent by containing the monomer component x2 as a monomer component.

  The content of the monomer component x2 in the polymer X (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 5 to 60 wt%, and 10 to 50 wt%. More preferably. When the content of the monomer component x2 in the polymer X is a value within the above range, without inhibiting the functions of the monomer component x1 and the monomer components x3 and x4 described in detail later, The effects as described above can be expressed more remarkably. On the other hand, when the content of the monomer component x2 in the polymer X is less than the lower limit, the effect of including the monomer component x2 may not be sufficiently exhibited. On the other hand, when the content of the monomer component x2 in the polymer X exceeds the upper limit, the content of the monomer components x1, x3, and x4 is relatively lowered, and these functions are not sufficiently exhibited. there is a possibility. In addition, the reactivity of the polymer X at a relatively low temperature increases, and the storage stability of the color filter ink tends to decrease. In addition, when the polymer X is a mixture of a plurality of kinds of compounds, the weighted average value (weighted average value based on the weight ratio) for these compounds is adopted as the content value of the monomer component x2. can do. Moreover, when the polymer X is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component x2 at the above-described content.

(Monomer component x3)
The polymer X contains the monomer component x3 represented by the formula (7) as a monomer component.
When the polymer X contains the monomer component x3, the affinity and compatibility between the polymer X and the polymer W described above can be made sufficiently excellent. As a result, the discharge stability of the color filter ink can be made excellent, and the colored portion formed using the color filter ink has excellent transparency (light transmission due to the opacity of the resin material). Rate is prevented), adhesion to the substrate is particularly excellent, and problems such as cracks are less likely to occur.

  Further, by containing the monomer component x3 as the monomer component, the chemical resistance, solvent resistance, and the like of the colored portion to be formed can be improved. Thus, after the colored portion forming step (curing step), chemical application and washing (especially washing with N-methyl-2-pyrrolidone, γ-butyrolactone, isopropyl alcohol, hydrochloric acid, aqueous sodium hydroxide, etc.), etc. Even when post-processing is performed, the occurrence of adverse effects due to these can be reliably prevented.

Further, the monomer component x3 has a sufficiently low reactivity at a relatively low temperature (for example, 100 ° C. or lower) in the polymer X, similarly to the monomer component x1 described above. Under a heating environment such as a heat treatment applied in the forming step (curing step), the substrate exhibits sufficient reactivity. For this reason, in the coloring part formation process (curing process) performed in a heating environment while reliably preventing unintentional reaction (polymerization reaction) of the resin material during storage of the color filter ink or in the ink application process described later. Can suitably advance the curing reaction (polymerization reaction) of the resin material.
Further, by containing the monomer component x3 as a monomer component, for example, when the color filter ink contains a pigment, the dispersion stability of the pigment particles can be made particularly excellent. The long-term storage stability and ejection stability of the filter ink can be made particularly excellent.

  The content of the monomer component x3 in the polymer X (value obtained by conversion based on the weight of the monomer used for the synthesis of the polymer) is preferably 2 to 20 wt%, and 3 to 15 wt%. More preferably. When the content of the monomer component x3 in the polymer X is a value within the above range, without inhibiting the functions of the monomer components x1 and x2 described above and the monomer component x4 described in detail later, The effects as described above can be expressed more remarkably. On the other hand, when the content of the monomer component x3 in the polymer X is less than the lower limit, the effect of including the monomer component x3 may not be sufficiently exhibited. On the other hand, when the content of the monomer component x3 in the polymer X exceeds the upper limit, the content of the monomer components x1, x2, and x4 is relatively decreased, and these functions are not sufficiently exhibited. there is a possibility. In addition, the colored portion formed using the color filter ink becomes too hard, and the tendency to follow the deformation of the substrate or the like accompanying a temperature change appears. In addition, when the polymer X is a mixture of a plurality of types of compounds, the weighted average value (weighted average value based on the weight ratio) of these compounds is adopted as the content value of the monomer component x3. can do. Moreover, when the polymer X is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component x3 with the content as described above.

(Monomer component x4)
The polymer X contains the monomer component x4 represented by the formula (8) as a monomer component.
By containing such a monomer component x4 as a monomer component, the solid content concentration is increased when the liquid medium is removed from the color filter ink applied on the substrate during the formation of the colored portion. As a result, the thixotropic property and viscosity of the color filter ink are increased, and it is possible to more reliably prevent the occurrence of unintended irregularities on the surface of the formed colored portion. In particular, in the past, when a pigment was included as a colorant, a problem of unintentional unevenness on the surface of the formed colored portion occurred remarkably, but according to the present invention, such a problem occurs. Can be reliably prevented.

Moreover, the monomer component x4 has a hydroxyl group at the terminal. By having such a structure, the reaction at a relatively low temperature (for example, 100 ° C. or less) is sufficiently low, and the reaction is performed in a heating environment such as a heat treatment performed in the colored portion forming step (curing step). Can increase the sex. As a result, a colored portion forming step (curing step) performed in a heated environment while more reliably preventing unintentional reaction (polymerization reaction) of the resin material during storage of the color filter ink or in the ink application step described later. In the method, the curing reaction (polymerization reaction) of the resin material can be suitably advanced.
In addition, by containing the monomer component x4 as a monomer component, for example, when the color filter ink contains a pigment, the dispersion stability of the pigment particles can be made particularly excellent. The long-term storage stability and ejection stability of the filter ink can be made particularly excellent.

  The content of the monomer component x4 in the polymer X (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 2 to 20 wt%, and 3 to 15 wt%. More preferably. When the content of the monomer component x4 in the polymer X is a value within the above range, the above-described effects are more remarkable without inhibiting the functions of the monomer components x1, x2, and x3. Can be expressed. On the other hand, when the content of the monomer component x4 in the polymer X is less than the lower limit, the effect due to the inclusion of the monomer component x4 may not be sufficiently exhibited. On the other hand, when the content of the monomer component x4 in the polymer X exceeds the upper limit, the content of the monomer components x1, x2, and x3 is relatively lowered, and these functions are not sufficiently exhibited. there is a possibility. Moreover, the tendency for the hardness of the colored part formed using the ink for color filters to fall appears. In addition, when the polymer X is a mixture of a plurality of types of compounds, the weighted average value (weighted average value based on the weight ratio) of these compounds is used as the content value of the monomer component x4. can do. Moreover, when the polymer X is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component x4 with the content as described above.

In addition, the polymer X may contain monomer components (other monomer components) other than the monomer components x1, x2, x3, and x4 described above. Thereby, for example, the effect derived from the chemical structure of another monomer can be acquired, exhibiting the above characteristics.
When the polymer X includes other monomer components (monomer components other than the monomer components x1, x2, x3, and x4), the content of other monomer components in the polymer X ( When a plurality of other monomer components are included, the sum of these contents) is preferably 15 wt% or less, and more preferably 10 wt% or less.

The weight average molecular weight of the polymer X is preferably 1000 to 50000, more preferably 1200 to 10000, and further preferably 1500 to 5000. As a result, it is possible to make the color filter ink stable over time (long-term storage stability), the discharge stability of the color filter ink, and the color filter productivity sufficiently. Furthermore, the flatness of the colored portion formed using the color filter ink can be made more reliable, and the occurrence of color unevenness or the like in the image displayed using the color filter can be more effectively achieved. Can be prevented.
Moreover, it is preferable that the dispersion degree (weight average molecular weight Mw / number average molecular weight Mn) of the polymer X is 1-3.

[Polymer Y]
The polymer Y includes a monomer component y1 represented by the following formula (9) and a monomer component y2 represented by the following formula (10). Examples of the polymer Y include those represented by the following formula (19).

By including such a polymer Y, the color filter ink is used while the discharge stability of the color filter ink and the dispersion stability of the pigment when the color filter ink contains a pigment are excellent. The adhesion of the colored part formed to the substrate can be made particularly excellent, and the durability and reliability of the produced color filter can be made particularly excellent.
The polymer Y may be substantially composed of a single compound or a mixture of a plurality of types of compounds. However, when the polymer Y is a mixture of a plurality of types of compounds, each compound contains monomer components y1 and y2.

(Monomer component y1)
The polymer Y contains the monomer component y1 represented by the formula (9) as a monomer component.
By including such a monomer component y1 as the monomer component, the adhesion of the formed colored portion to the substrate can be made particularly excellent. As a result, the durability of the color filter can be made particularly excellent.

  The content of the monomer component y1 in the polymer Y (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 30 to 90 wt%, and 40 to 80 wt%. More preferably. When the content of the monomer component y1 in the polymer Y is a value within the above range, the above-described effects are more remarkably exhibited without inhibiting the function of the monomer component y2 described in detail later. Can be made. On the other hand, when the content of the monomer component y1 in the polymer Y is less than the lower limit value, the effect of including the monomer component y1 may not be sufficiently exhibited. On the other hand, when the content of the monomer component y1 in the polymer Y exceeds the upper limit, the content of the monomer component y2 is relatively lowered, and the function of the monomer component y2 is not sufficiently exhibited. there is a possibility. In addition, when the colored portion is formed, when the liquid medium is removed from the color filter ink applied on the substrate, the viscosity of the color filter ink tends to increase as the solid content concentration increases. Involuntary irregularities are likely to occur on the surface of the colored portion. In addition, when the polymer Y is a mixture of a plurality of types of compounds, the weighted average value (weighted average value based on the weight ratio) of these compounds is adopted as the content value of the monomer component y1. can do. Moreover, when the polymer Y is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component y1 at the content as described above.

(Monomer component y2)
The polymer Y contains the monomer component y2 represented by the formula (10) as a monomer component.
By containing such a monomer component y2 as a monomer component (particularly, together with the above-described monomer component y1), the resin in the storage of the color filter ink or in the ink application step described later, etc. In the colored part forming step (curing step) performed in a heating environment while preventing unintentional reaction (polymerization reaction) of the material more reliably, the curing reaction (polymerization reaction) of the resin material can be suitably advanced. it can. In particular, in the colored portion forming step (curing step) under a heating environment, the rising of the polymerization reaction of the resin material can be improved, and the polymerization reaction can be continuously advanced. Moreover, the hardness etc. of the colored part formed can be made excellent by containing the monomer component y2 as a monomer component.

  In addition, when the polymer Y contains the monomer component y2, the affinity and compatibility of the polymer Y with respect to the polymer W and the like can be sufficiently improved. As a result, the discharge stability of the color filter ink can be made excellent, and the colored portion formed using the color filter ink has excellent transparency (light transmission due to the opacity of the resin material). Rate is prevented), adhesion to the substrate is particularly excellent, and problems such as cracks are less likely to occur. On the other hand, when the monomer component y2 is not included as the monomer component, the affinity and compatibility of the polymer Y with respect to the polymer W and the like cannot be sufficiently improved, and the color filter ink Is inferior in ejection stability, and the produced color filter is liable to cause uneven color and density, and inferior in contrast, durability, reliability and the like.

  The content of the monomer component y2 in the polymer Y (value obtained by conversion in terms of the weight of the monomer used for polymer synthesis) is preferably 10 to 70 wt%, and is 20 to 60 wt%. More preferably. When the content of the monomer component y2 in the polymer Y is a value within the above range, the above-described effects can be expressed more significantly without inhibiting the function of the monomer component y1 described above. Can do. On the other hand, when the content of the monomer component y2 in the polymer Y is less than the lower limit value, the effect of including the monomer component y2 may not be sufficiently exhibited. On the other hand, when the content of the monomer component y2 in the polymer Y exceeds the upper limit, the content of the monomer component y1 is relatively lowered, and the function of the monomer component y1 is not sufficiently exhibited. there is a possibility. In addition, the reactivity of the polymer Y at a relatively low temperature increases, and the storage stability of the color filter ink tends to decrease. In addition, when the polymer Y is a mixture of a plurality of types of compounds, the weighted average value (weighted average value based on the weight ratio) for these compounds is adopted as the content value of the monomer component y2. can do. Moreover, when the polymer Y is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component y2 with the content as described above.

In addition, the polymer Y may contain monomer components (other monomer components) other than the monomer components y1 and y2 described above. Thereby, for example, the effect derived from the chemical structure of another monomer can be acquired, exhibiting the above characteristics.
When the polymer Y contains other monomer components (monomer components other than the monomer components y1 and y2), the content of other monomer components in the polymer Y (multiple types of other components) In the case where the monomer component is included, the sum of these contents) is preferably 15 wt% or less, and more preferably 10 wt% or less.

The weight average molecular weight of the polymer Y is preferably 1000 to 50000, more preferably 1200 to 10000, and further preferably 1500 to 5000. As a result, it is possible to make the color filter ink stable over time (long-term storage stability), the discharge stability of the color filter ink, and the color filter productivity sufficiently. Furthermore, the flatness of the colored portion formed using the color filter ink can be made more reliable, and the occurrence of color unevenness or the like in the image displayed using the color filter can be more effectively achieved. Can be prevented.
Moreover, it is preferable that the dispersion degree (weight average molecular weight Mw / number average molecular weight Mn) of the polymer Y is 1-3.

[Polymer Z]
The polymer Z includes a monomer component z1 represented by the following formula (11), a monomer component z2 represented by the following formula (12), and a monomer component z3 represented by the following formula (13): Is included. Examples of the polymer Z include those represented by the following formula (20).

By including such a polymer Z, the switching characteristics of the curing reaction as a resin material, the discharge stability of the color filter ink, the hardness of the formed colored portion, etc. can be made particularly excellent. When the color filter ink contains a pigment, the dispersion stability of the pigment can be made particularly excellent. In addition, by including the polymer Z, it is possible to more effectively prevent unintended irregularities from occurring on the surface of the colored portion formed using the color filter ink. It is possible to more effectively prevent the occurrence of color unevenness and density unevenness and a decrease in contrast ratio in the displayed image. In addition, by including the polymer Z, when the color filter ink is manufactured using a manufacturing method as described later (in a fine dispersion step described later), the aggregate of pigment particles used as a raw material can be more easily formed into fine particles. And the productivity of the color filter ink can be improved. In addition, since the polymer Z has extremely excellent stability with respect to mechanical force, even when the polymer Z is subjected to the fine dispersion step described later together with the pigment, the modification and deterioration in the step are not caused. Is prevented. Therefore, by using the polymer Z, it is possible to more efficiently prepare a color filter ink excellent in pigment dispersibility while reliably preventing deterioration of the resin material.
The polymer Z may be substantially composed of a single compound, or may be a mixture of a plurality of types of compounds. However, when the polymer Z is a mixture of a plurality of types of compounds, each compound contains monomer components z1, z2, and z3.

(Monomer component z1)
The polymer Z contains the monomer component z1 represented by the formula (11) as a monomer component.
By containing such monomer component z1 as a monomer component, unintentional reaction (polymerization reaction) of the resin material during storage of the color filter ink or in the ink application process described later can be prevented more reliably. However, in the colored part forming step (curing step) performed in a heating environment, the curing reaction (polymerization reaction) of the resin material can be more suitably progressed. That is, the switching characteristics of the curing reaction for the resin material can be made particularly excellent. In addition, by containing the monomer component z1 as the monomer component, when the color filter ink contains a pigment, the dispersion stability of the pigment particles can be made particularly excellent. The long-term storage stability and discharge stability can be made particularly excellent. In addition, the monomer component z1 in the polymer Z is excellent in reactivity under a high temperature environment, but has extremely excellent stability against mechanical force. For this reason, for example, even when it is subjected to the fine dispersion step described later together with the pigment, the modification and deterioration of the polymer Z in this step are prevented, and the function of the polymer Z is ensured in the color filter ink. It can be demonstrated. Further, by containing the monomer component z1 as a monomer component, the hardness of the colored portion to be formed can be made particularly excellent.

  Further, when the polymer Z contains the monomer component z1, the affinity and compatibility between the polymer W and the polymer Z can be made sufficiently excellent. As a result, the discharge stability of the color filter ink can be made excellent, and the colored portion formed using the color filter ink has excellent transparency (light transmission due to the opacity of the resin material). Rate is prevented), adhesion to the substrate is particularly excellent, and problems such as cracks are less likely to occur.

  The content of the monomer component z1 in the polymer Z (value obtained by conversion in terms of the weight of the monomer used for the synthesis of the polymer) is preferably 50 to 95 wt%, and 60 to 85 wt%. More preferably. When the content of the monomer component z1 in the polymer Z is a value within the above range, the above-described effects are more prominent without inhibiting the functions of the monomer components z2 and z3 described in detail later. Can be expressed. In addition, when the polymer Z is a mixture of a plurality of types of compounds, the weighted average value (weighted average value based on the weight ratio) for these compounds is adopted as the content value of the monomer component z1. can do. Moreover, when the polymer Z is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component z1 at the content as described above.

(Monomer component z2)
The polymer Z contains the monomer component Z2 represented by the formula (12) as a monomer component.
By containing such a monomer component z2 as the monomer component, the color filter ink can be spread more favorably on the substrate, and mixing of bubbles and the like can be reliably prevented. A colored portion having excellent adhesion to the substrate can be formed more suitably. In addition, when the color filter ink contains a pigment and a dispersant, by containing the monomer component z2 as a monomer component, not only the dispersion stability of the pigment but also the dispersion stability of the dispersant can be obtained. It can be made particularly excellent. As a result, the pigment dispersion stability and the long-term storage stability of the color filter ink can be made particularly excellent.

  In addition, when the polymer Z contains the monomer component z2, the affinity and compatibility between the polymer W and the polymer Z can be sufficiently improved. As a result, the discharge stability of the color filter ink can be made excellent, and the colored portion formed using the color filter ink has excellent transparency (light transmission due to the opacity of the resin material). Rate is prevented), adhesion to the substrate is particularly excellent, and problems such as cracks are less likely to occur.

  The content of the monomer component z2 in the polymer Z (value obtained by conversion in terms of the weight of the monomer used for the synthesis of the polymer) is preferably 3 to 35 wt%, and 10 to 25 wt%. More preferably. When the content of the monomer component z2 in the polymer Z is a value within the above range, the above-described monomer component z1 and the above-described monomer component z3 described in detail later are not inhibited. Such an effect can be expressed more remarkably. In addition, when the polymer Z is a mixture of a plurality of types of compounds, the weighted average value (weighted average value based on the weight ratio) for these compounds is used as the content value of the monomer component z2. can do. Further, when the polymer Z is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component z2 at the above-described content.

(Monomer component z3)
The polymer Z contains the monomer component z3 represented by the formula (13) as a monomer component.
Such a monomer component z3 is a component that contributes to the curing of the resin material in the colored portion forming step (curing step) described later, as with the monomer component w1 and the like described above. While w1 has a function of increasing the hardness of the colored portion to be formed, the monomer component z3 gives an appropriate flexibility to the formed colored portion, and the colored portion is provided. Even when the substrate or the like is deformed (for example, thermal expansion or thermal contraction), it has a function of following the deformation and maintaining the adhesion of the colored portion to the substrate or the like. Thereby, for example, even when the manufactured color filter is repeatedly exposed to a rapid temperature change accompanying image display, good adhesion can be maintained, and problems such as light leakage (white spots, bright spots), etc. Can be prevented more reliably. That is, the durability of the color filter can be made particularly excellent.

Further, the monomer component z3 has a sufficiently low reactivity at a relatively low temperature (for example, 100 ° C. or lower) in the polymer Z, like the monomer component w1 described above. In a heating environment such as a heat treatment applied in the formation step (curing step), the substrate has sufficient reactivity. For this reason, in the coloring part formation process (curing process) performed in a heating environment while reliably preventing unintentional reaction (polymerization reaction) of the resin material during storage of the color filter ink or in the ink application process described later. Can suitably advance the curing reaction (polymerization reaction) of the resin material.
In addition, by containing the monomer component z3 as a monomer component, the solid content concentration is increased when the liquid medium is removed from the color filter ink applied on the substrate during the formation of the colored portion. Along with this, the thixotropic property and viscosity of the color filter ink are increased, and it is possible to reliably prevent the occurrence of unintended irregularities on the surface of the formed colored portion.

  The content of the monomer component z3 in the polymer Z (value obtained by conversion in terms of the weight of the monomer used for the synthesis of the polymer) is preferably 2 to 30 wt%, and 5 to 20 wt%. More preferably. When the content of the monomer component z3 in the polymer Z is a value within the above range, the above-described effects are more remarkably exhibited without inhibiting the functions of the monomer components z1 and z2. Can be made. In addition, when the polymer Z is a mixture of a plurality of types of compounds, the weighted average value (weighted average value based on the weight ratio) for these compounds is adopted as the content value of the monomer component z3. can do. Further, when the polymer Z is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component z3 at the above-described content.

In addition, the polymer Z may contain monomer components (other monomer components) other than the monomer components z1, z2, and z3 described above. Thereby, for example, the effect derived from the chemical structure of another monomer can be acquired, exhibiting the above characteristics.
When the polymer Z contains other monomer components (monomer components other than the monomer components z1, z2, and z3), the content of other monomer components in the polymer Z (multiple types) When the other monomer component is included, the sum of these contents) is preferably 15 wt% or less, more preferably 10 wt% or less.

  The weight average molecular weight of the polymer Z is preferably 5000 to 50000, and more preferably 6000 to 15000. As a result, it is possible to make the color filter ink stable over time (long-term storage stability), the discharge stability of the color filter ink, and the color filter productivity sufficiently. Furthermore, the flatness of the colored portion formed using the color filter ink can be made more reliable, and the occurrence of color unevenness in the image displayed using the color filter can be more effectively achieved. Can be prevented.

Moreover, it is preferable that the dispersion degree (weight average molecular weight Mw / number average molecular weight Mn) of the polymer Z is 1-3.
In addition, each polymer mentioned above should finally have a structure as described above (each partial structure corresponding to each monomer component), and is synthesized using each monomer component described above. It may be synthesized, or may be synthesized using a component (precursor, derivative, etc.) different from the monomer component described above.

  In addition, the content of the resin material in the color filter ink is preferably 0.5 to 18 wt%, more preferably 1 to 15 wt%, and further preferably 3 to 10 wt%. When the content of the resin material is within the above range, the storage stability in the color filter ink and the discharge property of the color filter ink from the droplet discharge head are particularly excellent, and the color is manufactured. The durability of the filter can be made particularly excellent. Further, a sufficient color density can be secured in the manufactured color filter.

When the color filter ink contains a pigment as a colorant, the content of the resin material in the color filter ink is C _R [wt%], and the content of the pigment in the color filter ink is C _P [wt %], It is preferable to satisfy the relationship of 0.2 ≦ _CR / _CP ≦ 9.0, and it is more preferable to satisfy the relationship of 0.3 ≦ _CR / _CP ≦ 5.0. More preferably, the relationship 0.4 ≦ C _R / C _P ≦ 3.5 is satisfied. By satisfying such a relationship, the dispersion stability of the pigment in the color filter ink and the ejection stability of the color filter ink are sufficiently excellent, and the contrast of the produced color filter is more excellent. Even when the thickness of the colored portion is thinner, sufficient contrast can be ensured. In addition, in the conventional color filter ink, when the content of the resin material is low with respect to the pigment content, the dispersion stability of the pigment in the color filter ink and the discharge stability of the color filter ink are In the present invention, the content of the resin material with respect to the content of the pigment is low as described above. Even in this case, it is possible to reliably prevent the occurrence of the above problems. That is, by satisfying the relationship as described above, the effects of the present invention are more remarkably exhibited.

The resin material constituting the color filter ink includes a polymer other than those described above (for example, a thermoplastic polymer or a curable polymer other than the above-described polymers W, X, Y, and Z). It may be.
The color filter ink may contain components other than those described above. Examples of the components other than those described above constituting the color filter ink include a dispersant.

<Dispersant>
The color filter ink may contain a dispersant. Thereby, for example, the dispersibility of the pigment particles in the color filter ink can be improved, and the discharge stability of the ink droplets can be made particularly excellent. In particular, when the polymer W and the dispersant are used in combination, these effects work synergistically, and the dispersion stability of the pigment in the color filter ink and the discharge stability of the color filter ink are particularly excellent. Can be.
Examples of the dispersant include cationic, anionic, nonionic, amphoteric, silicone, and fluorine surfactants.

  More specific examples of the dispersant include, for example, Dispersic 101, Dispersic 102, Dispersic 103, Dispersic P104, Dispersic P104S, Dispersic 220S, Dispersic 106, Dispersic 108, Dispersic 109, Disperse Bic 110, Dispersic 111, Dispersic 112, Dispersic 116, Dispersic 140, Dispersic 142, Dispersic 160, Dispersic 161, Dispersic 162, Dispersic 163, Dispersic 164, Dispersic 166, Dispersic 167 Dispersic 168, Dispersic 170, Dispersic 171, Dispersic 1 4, Dispersic 180, Dispersic 182, Dispersic 183, Dispersic 184, Dispersic 185, Dispersic 2000, Dispersic 2001, Dispersic 2050, Dispersic 2070, Dispersic 2095, Dispersic 2150, Dispersic LPN6919, Dispersic 9075, Dispersic 9077 (above, manufactured by BYK Chemie); EFKA 4008, EFKA 4009, EFKA 4010, EFKA 4015, EFKA 4020, EFKA 4046, EFKA 4047, EFKA 4050, EFKA 4055, EFKA 4055, EFKA 4055 , EFKA 4401, EFKA 4402, EF A 4403, EFKA 4406, EFKA 4408, EFKA 4300, EFKA 4330, EFKA 4340, EFKA 4015, EFKA 4800, EFKA 5010, EFKA 5065, EFKA 5066, EFKA 5070, EFKA 5070, EFKA 5070 Sol Sparse 3000, Sol Sparse 9000, Sol Sparse 13000, Sol Sparse 16000, Sol Sparse 17000, Sol Sparse 18000, Sol Sparse 20000, Sol Sparse 21000, Sol Sparse 24000, Sol Sparse 26000, Sol Sparse 27000, Sol Sparse 28000, Sol Sparse 32000, Sol Sparse 32500, Sol Sparse 32550, Sol Sparse 33500, Solsperse 35100, Solsperse 35200, Solsperse 36000, Solsperse 36600, Solsperse 38500, Solsperse 41000, Solsperse 41090, Solsperse 20000 (above, manufactured by Lubrizol); Manufactured by Ajinomoto Fine Techno Co., Ltd.); Disparon 1850, Disparon 1860, Disparon 2150, Disparon 7004, Disparon DA-100, Disparon DA-234, Disparon DA-325, Disparon DA-375, Disparon DA-705, Disparon DA-725, Disparon PW-36 (above, manufactured by Enomoto Kasei Co., Ltd.) And Florene DOPA-14, Florene DOPA-15B, Florene DOPA-17, Florene DOPA-22, Floren DOPA-44, Floren TG-710, Floren D-90 (manufactured by Kyoei Chemical Co., Ltd.), Anti-Terra-205 (Made by Big Chemie), Hinoact KF-1000, KF-1525, Hinoact 1300M, Hinoact T9050, Hinoact T6000, Hinoact T7000, Hinoact T8000, Hinoact T8000E (above, manufactured by Kawaken Fine Chemical Co., Ltd.) and the like are selected. These can be used alone or in combination.

  In particular, in the present invention, as the dispersant, a dispersant having a predetermined acid value (hereinafter also referred to as an acid value dispersant) and a dispersant having a predetermined amine value (hereinafter also referred to as an amine value dispersant) It is preferable to use together. As a result, the trajectory of the droplet ejected from the droplet ejection device changes (so-called flight bending occurs), and it becomes impossible to land the droplet on the target site, or the ejection amount of the droplet is low. It can effectively prevent problems such as stabilization (instability of droplet ejection), and more effectively prevent color unevenness and density unevenness at each part of the manufactured color filter. The uniformity of the characteristics between them can be made particularly excellent. Further, the dispersion stability of the pigment in the color filter ink (long-term storage stability of the color filter ink) can be made particularly excellent.

  Specific examples of the acid value dispersant include Dispersic P104, Dispersic P104S, Dispersic 220S, Dispersic 110, Dispersic 111, Dispersic 170, Dispersic 171, Dispersic 174, Dispersic 2095 (above, BYK Chemie) EFKA 5010, EFKA 5065, EFKA 5066, EFKA 5070, EFKA 7500, EFKA 7554 (manufactured by Ciba Specialty Co., Ltd.); (Above, manufactured by Lubrizol), Hinoact KF-1000 (Kawaken Fine Chemi) Le Co., Ltd.).

  Specific examples of the amine value dispersant include Dispersic 102, Dispersic 160, Dispersic 161, Dispersic 162, Dispersic 163, Dispersic 164, Dispersic 166, Dispersic 167, Dispersic 168, Dispersic 2150, Dispersic LPN6919, Dispersic 9075, Dispersic 9077 (above, manufactured by BYK Chemie); EFKA 4015, EFKA 4020, EFKA 4046, EFKA 4047, EFKA 4050, EFKA 4055, EFKA 4060, EFKA 4060, EFKA 4060, EFKA 4060, , EFKA 4340, EFKA 4400, EFKA 4401, EFKA 4402, EFK A4403, EFKA 4800 (manufactured by Ciba Specialty); Azisper PB711 (manufactured by Ajinomoto Finetechno); Anti-Terra-205 (manufactured by Big Chemie), KF-1525, Hinoact 1300M, Hinoact T9050, Hinoact T6000 Hinoact T7000, Hinoact T8000, Hinoact T8000E (manufactured by Kawaken Fine Chemical Co., Ltd.) and the like.

By using such a dispersant (acid value dispersant and amine value dispersant), the dispersion stability of the pigment in the ink is excellent without adversely affecting the color of the formed colored portion. can do.
When the acid value dispersant and the amine value dispersant are used in combination, the acid value of the acid value dispersant (acid value when converted to solid content) is not particularly limited, but is preferably 5 to 370 KOHmg / g. It is more preferably 20 to 270 KOH mg / g, and further preferably 30 to 135 KOH mg / g. When the acid value of the acid value dispersant is within the above range, the dispersion stability of the pigment when used in combination with the amine value dispersant can be made particularly excellent, and it is also used in combination with the amine value dispersant. In this case, the effect of reducing and stabilizing the viscosity of the color filter ink can be obtained more remarkably. The acid value of the dispersant can be determined by a method based on DIN EN ISO 2114, for example.

Moreover, it is preferable that the acid value dispersant does not have a predetermined amine value, that is, the amine value is zero.
When the amine value dispersant and the acid value dispersant are used in combination, the amine value of the amine value dispersant (amine value in terms of solid content) is not particularly limited, but is preferably 5 to 200 KOHmg / g. It is more preferably 25 to 170 KOH mg / g, and further preferably 30 to 130 KOH mg / g. When the amine value of the amine value dispersant is within the above range, the dispersion stability of the pigment when used in combination with the acid value dispersant can be made particularly excellent. In this case, the effect of reducing and stabilizing the viscosity of the color filter ink can be obtained more remarkably. In addition, the amine value about a dispersing agent can be calculated | required by the method based on DIN 16945, for example.

Moreover, it is preferable that the amine value dispersant does not have a predetermined acid value, that is, the acid value is zero.
Further, when the acid value dispersant and the amine value dispersant are used in combination, the content of the acid value dispersant in the color filter ink is X _A [wt%], and the amine value dispersant is contained in the color filter ink. When the rate is X _B [wt%], it is preferable that the relationship of 0.1 ≦ X _A / X _B ≦ 1 is satisfied, and the relationship of 0.15 ≦ X _A / X _B ≦ 0.5 is satisfied. Is more preferable. By satisfying such a relationship, the synergistic effect by using the acid value dispersant and the amine value dispersant in combination is more remarkably exhibited, and the pigment dispersion stability, droplet ejection stability, etc. are particularly excellent. Can be.

The acid value of the acid value dispersant is AV [KOH mg / g], the amine value of the amine value dispersant is BV [KOH mg / g], the content of the acid value dispersant is X _A [wt%], and the amine When the content of the valent dispersant is X _B [wt%], it is preferable that the relationship of 0.01 ≦ (AV × X _A ) / (BV × X _B ) ≦ 1.9 is satisfied, and 0.10 _{≦ (AV × X a) /} (BV × X B) is more desirable to satisfy the relation of ≦ 1.5. By satisfying such a relationship, the synergistic effect by using the acid value dispersant and the amine value dispersant in combination is more remarkably exhibited, and the pigment dispersion stability, droplet ejection stability, etc. are particularly excellent. Can be.

  Moreover, you may use a dispersing agent other than the above as a dispersing agent. For example, as the dispersant, a compound having a siamelide skeleton can be used. By using such a compound as a dispersant, the dispersibility of the pigment in the liquid medium in which the resin material as described above is dissolved can be made particularly excellent, and the ejection stability of the color filter ink can be improved. It can be made particularly excellent. Such an excellent effect is not obtained simply by using a compound having a seamide skeleton as a dispersant, but includes a liquid medium as described above and a resin material as described above (including the polymer W). Resin material) and a compound having a seamellide skeleton are used in combination to obtain a synergistic effect.

  Moreover, as a dispersing agent, the compound which has the partial structure represented by following formula (21) and following formula (22) can be used, for example. By using such a compound as a dispersant, the dispersibility of the pigment in the color filter ink can be made particularly excellent, and the discharge stability of the color filter ink should be made particularly excellent. Can do.

  The content of the dispersant in the color filter ink is not particularly limited, but is preferably 0.3 to 15 wt%, and more preferably 0.5 to 8 wt%.

<Other ingredients>
The color filter ink of the present invention may contain components other than those described above. Examples of such components include various crosslinking agents; thermal acid generators such as diazonium salts, iodonium salts, sulfonium salts, phosphonium salts, selenium salts, oxonium salts, ammonium salts, onium salts such as benzothiazolium salts; Photoacid generators such as diazonium salts, iodonium salts, sulfonium salts, phosphonium salts, selenium salts, oxonium salts, ammonium salts; various polymerization initiators; acid crosslinking agents; surfactants; sensitizers; light stabilizers; Leveling agent; adhesion improver; various polymerization accelerators; various light stabilizers; fillers such as glass and alumina; vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, N- ( 2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N- (2-aminoethyl) ) -3-Aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltri Adhesion promoters such as methoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane; 2,2-thiobis (4-methyl) -6-t-butylphenol), 2,6-di-t-butylphenol and other antioxidants; 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, alkoxybenzophenone UV absorbers such as Aggregation inhibitor such as sodium Le acid.

  As the crosslinking agent, for example, polyvalent carboxylic acid anhydride, polyvalent carboxylic acid, polyfunctional epoxy monomer, polyfunctional acrylic monomer, polyfunctional vinyl ether monomer, polyfunctional oxetane monomer and the like can be used. Specific examples of polyhydric carboxylic acid anhydrides include phthalic anhydride, itaconic anhydride, succinic anhydride, citraconic anhydride, dodecenyl succinic anhydride, tricarballylic anhydride, maleic anhydride, hexahydrophthalic anhydride, dimethyltetrahydro anhydride Aliphatic or alicyclic dicarboxylic anhydrides such as phthalic acid, hymic anhydride, and nadic anhydride; Fats such as 1,2,3,4-butanetetracarboxylic dianhydride, cyclopentanetetracarboxylic dianhydride Aromatic polycarboxylic dianhydrides; aromatic polycarboxylic anhydrides such as pyromellitic anhydride, trimellitic anhydride, and benzophenone tetracarboxylic anhydride; ester groups such as ethylene glycol bistrimellitate and glycerin tristrimitate Examples of the acid anhydrides include aromatic polycarboxylic anhydrides. Masui. Moreover, the epoxy resin hardening | curing agent which consists of a commercially available carboxylic acid anhydride can also be used suitably. Specific examples of the polycarboxylic acid include aliphatic polycarboxylic acids such as succinic acid, glutaric acid, adipic acid, butanetetracarboxylic acid, maleic acid, and itaconic acid; hexahydrophthalic acid, 1,2-cyclohexane. Aliphatic polycarboxylic acids such as dicarboxylic acid, 1,2,4-cyclohexanetricarboxylic acid and cyclopentanetetracarboxylic acid, and phthalic acid, isophthalic acid, terephthalic acid, pyromellitic acid, trimellitic acid, 1,4,5 , 8-Naphthalenetetracarboxylic acid, benzophenonetetracarboxylic acid, and other aromatic polyvalent carboxylic acids, among which aromatic polyvalent carboxylic acids are preferred. Specific examples of the polyfunctional epoxy monomer include Daicel Chemical Industries, Ltd., trade name Celoxide 2021, Daicel Chemical Industries, Ltd., trade name Epolide GT401, Daicel Chemical Industries, Ltd., trade name Epolide PB3600, and Bisphenol A. , Hydrogenated bisphenol A, triglycidyl isocyanurate, and the like. Specific examples of the polyfunctional acrylic monomer include pentaerythritol ethoxytetraacrylate, pentaerythritol tetraacrylate, pentaerythritol triacrylate, ditrimethylolpropane tetraacrylate, trimethylolpropane triacrylate, trimethylolpropane ethoxytriacrylate, dipentaerythritol. Examples include hexaacrylate trimethallyl isocyanurate and triallyl isocyanurate. Specific examples of the polyfunctional vinyl ether monomer include 1,4-butanediol divinyl ether, 1,6-hexanediol divinyl ether, nonanediol divinyl ether, cyclohexanediol divinyl ether, cyclohexanedimethanol divinyl ether, and triethylene. Examples include glycol divinyl ether, trimethylolpropane trivinyl ether, pentaerythritol tetravinyl ether, and the like. Specific examples of the polyfunctional oxetane monomer include xylylene oxetane, biphenyl type oxetane, novolak type oxetane and the like.

  The surfactant flattens the colored portion by reducing the surface tension of the ink. As such surfactants, for example, acrylic surfactants, vinyl ether surfactants, silicone surfactants, fluorine surfactants and the like can be used, and among these, acrylic surfactants are used. It is preferable to use it. The acrylic surfactant can contribute to the flattening of the colored portion and has excellent affinity with the polymer W as described above, and can increase the brightness of the formed colored portion.

  The thermal acid generator is a component that generates an acid by heating, and among them, a sulfonium salt and a benzothiazolium salt are particularly preferable. As more specific examples of thermal acid generators, as trade names, Sun-Aid SI-45, Same as left SI-47, Same as left SI-60, Same as left SI-60L, Same as left SI-80, Same as left SI-80L, Same as left SI- 100, same left SI-100L, same left SI-145, same left SI-150, same left SI-160, same left SI-110L, same left SI-180L (above, Sanshin Chemical Co., Ltd., product name), CI-2921, CI -2920, CI-2946, CI-3128, CI-2624, CI-2639, CI-2064 (Nippon Soda Co., Ltd. product, trade name), CP-66, CP-77 (Asahi Denka Kogyo Co., Ltd. products) , Product name), FC-520 (product of 3M company, product name) and the like.

  The photoacid generator is a component that generates an acid by light. As more specific examples, as trade names, Cyracure UVI-6970, Cyracure UVI-6974, Cyracure UVI-6990, Cyracure UVI-950 (above, US Union Carbide, trade name), Irgacure 261 (Ciba Specialty Chemicals, trade name), SP-150, SP-151, SP-170, Optmer SP-171 (above, manufactured by Asahi Denka Kogyo Co., Ltd.) , Trade name), CG-24-61 (trade name, manufactured by Ciba Specialty Chemicals), DAICAT II (trade name, manufactured by Daicel Chemical Industries, Ltd.), UVAC1591 (trade name, manufactured by Daicel UCB Co., Ltd.) CI-2064, CI-2639, CI-2624, CI-2481, CI-2 34, CI-2855, CI-2823, CI-2758 (Nippon Soda Co., Ltd. product, trade name), PI-2074 (Rhone-Poulenc, trade name, pentafluorophenylborate toluylcumyl iodonium salt), FFC509 ( 3M company product, trade name), BBI-102, BBI-101, BBI-103, MPI-103, TPS-103, MDS-103, DTS-103, NAT-103, NDS-103 (Midori Chemical Co., Ltd., product) Name), CD-1012 (trade name, manufactured by Sartomer, USA) and the like.

  As the leveling agent, for example, various anionic, cationic and nonionic surfactants can be used. Specific examples of the leveling agent include Megafac F-443, F-444, F-445, F-446, F-470, F-471, F-472SF, F-474, F-475, F-477, F-478, F-479, F-480SF, F-482, F-483, F-484, F-486, F-487, F-489, R-30 (above, Dainippon Ink & Chemicals, Inc.) NOVEC FC-4430, NOVEC FC-4432 (manufactured by Sumitomo 3M Limited); Surfinol 104, Surfinol 82, Surfinol 2502, Surfinol 420, Surfinol 440, Surfinol 465, Surfinol 485, Surfinol 104E, Surfinol 104H, Surfinol 104A, Surfinol 104BC, Surf Nord 104DPM, Surfinol 104PA, Surfinol 104PG-50, Surfinol 104S, Surfinol SE, Surfinol SE-F, Surfinol 504, Surfinol 61, Surfinol 2502, Surfinol 82, Surfinol DF110D, Surfinol DF37 Surfinol DF58, Surfinol DF75, Surfinol DF210, Surfinol CT111, Surfinol CT121, Surfinol CT131, Surfinol CT136, Surfinol CT151, Surfinol TG, Surfinol GA, Surfinol PSA-336, Dynal 604, Envirogem AD-01, Olefin E1004, Olefin E1010, Olefin PD- 01, olefin PD-002W, olefin PD-004, olefins EXP. 4001, Olefin EXP. 4036, Olefin EXP. 4051F, Olefin SPC, Olefin AF-103, Olefin AF-104, Olefin AK-02, Olefin SK-14, Olefin AE-3, Olefin PD-003, Olefin PD-201, Olefin PD-202, Olefin PD-301, Olefin B, Olefin P, Olefin Y, Olefin A, Olefin STG, Olefin SPC (manufactured by Nissin Chemical Industry Co., Ltd.); Phosphanol ML-200, Phosphanol ML-220, Phosphanol RD- 510Y, Phosphanol RS-410, Phosphanol RS-610, Phosphanol RS-710, Phosphanol RL-210, Phosphanol RL-310, Phosphanol RB-410, Phosphanol RD-720N ( Top, manufactured by Toho Chemical Co., Ltd.); Lanco Flow L, Lanco Flow U, SOLSPERSE 20000 (above, manufactured by Lubrizol Deutschland GmbH); Aftergent 100, Aftergent 100C, Aftergent 110, Aftergent 140A, Aftergent 150 , Aftergent 150CH, Aftergent AK, Aftergent 501, Aftergent 250, Aftergent 251, Aftergent 222F, FTX-218, Aftergent 300, Aftergent 310, Aftergent 400SW, Aftergent 251, FTX-212M , FT 250, FTX-245M, FTX-290M, FTX-207S, FTX-211S, FTX-220S, FTS-230S, FTX-209F, FTX-213F, FT 222-F, FT -233F, FTX-245F, FTX-208G, FTX-218G, FTX-230G, FTS-240G, FTX-204D, FTX-208D, FTX-212D, FTX-216D, FTX-218D, FTX-220D, FTX-222D FTX-720C, FTX-740C (manufactured by Neos Co., Ltd.); Surflon S-111n, Surflon S-113, Surflon S-121, Surflon S-131, Surflon S-132, Surflon S-141, Surflon S-145, Surflon S-381, Surflon S-383, Surflon S-393, Surflon SC-101, Surflon KH-40, Surflon SA-100 (above, manufactured by AGC Seimi Chemical Co., Ltd.); Unidyne DS-401 Unidyne DS-40 3, Unidyne NS-1602, Unidyne NS-1603, Unidyne NS-1605 (manufactured by Nihon Kasei Co., Ltd.) and the like. Among such surfactants, it is preferable to use a nonionic surfactant. Thereby, the surface of the colored part to be formed is further flattened, and the obtained color filter has particularly small color unevenness and density unevenness in each part.

  Specific examples of such nonionic surfactants include Megafac F-443, F-444, F-445, F-446, F-470, F-471, and F-472SF as trade names. , F-474, F-475, F-477, F-478, F-479, F-480SF, F-482, F-483, F-484, F-486, F-487, F-489, R -30 (above, manufactured by Dainippon Ink & Chemicals, Inc.); Surfynol 104, 82, left 2502, 250, left 420, left 440, left 465, left 485 (above, manufactured by Nissin Chemical Industry Co., Ltd.) ); Novec FC-4430, Novec FC-4432 (manufactured by Sumitomo 3M Ltd.); Footage 250, Footent 25, Footent 222F, FTX-218, Footage 251, FTX-212M, Aftergent 250, FTX-245M, FTX-290M, FTX-207S, FTX-211S, FTX-220S, FTS-230S, FTX-209F, FTX-213F, Aftergent 222F, FTX-233F , FTX-245F, FTX-208G, FTX-218G, FTX-230G, FTS-240G, FTX-204D, FTX-208D, FTX-212D, FTX-216D, FTX-218D, FTX-220D, FTX-222D, FTX -720C, FTX-740C (above, manufactured by Neos Co., Ltd.) and the like. Among these, Megafac F-444, F-484, F-479, F-477, F-489, and F-487 manufactured by Dainippon Ink and Chemicals, Inc. are particularly preferable. Thereby, the surface of the colored part to be formed is more reliably flattened, and as a result, a color filter in which the color unevenness and density unevenness at each part are more reliably suppressed can be obtained. Moreover, in the image display device provided with such a color filter, it is possible to more reliably prevent, for example, a problem that the display image becomes dark depending on the angle at which the display unit is viewed.

The color filter ink of the present invention is excellent in droplet ejection stability and effectively prevents changes in characteristics over time. For example, the color filter ink has a uniform color density over a long period of time (color filter). It can be suitably applied to formation and the like, and the occurrence of uneven color and uneven density in the formed color filter can be effectively prevented.
The viscosity at 25 ° C. of the color filter ink (viscosity measured using a vibration viscometer) is not particularly limited, but is preferably 4 to 12 mPa · s, more preferably 5 to 11 mPa · s. preferable. When the viscosity of the color filter ink is within the above range, clogging in the droplet discharge head is performed while the variation in the appropriate amount of the color filter ink to be discharged is particularly small in droplet discharge by the inkjet method. The color filter production efficiency (colored part formation efficiency) can be made particularly excellent, and the thickness of the colored part can be unintentionally varied. Can be prevented. The viscosity of the color filter ink can be measured using, for example, a vibration viscometer, and can be performed in particular in accordance with JIS Z8809.

  The color filter ink preferably has a change in viscosity at 25 ° C. of 0.5 mPa · s or less, and is 0.3 mPa · s or less after standing for 8 days in an environment of 55 ° C. More preferably, it is more preferably 0.2 mPa · s or less. As a result, the ejection stability of the color filter ink can be made particularly excellent, and it is suitably used for a longer period of time in the production of a color filter in which the occurrence of uneven color and uneven density is reliably prevented. be able to.

≪Method for producing color filter ink≫
Next, a preferred embodiment of the method for producing the color filter ink as described above, in particular, the method for producing the color filter ink containing a pigment as a colorant will be described.
The production method of this embodiment includes a polymer W solution preparation step for preparing a polymer W solution in which the polymer W is dissolved in a solvent, a pigment is added to the polymer W solution, and inorganic beads are added in multiple stages. It has a fine dispersion step of performing a dispersion treatment to obtain a pigment dispersion, and a resin material addition step of additionally mixing a resin material for dilution into the pigment dispersion.

<Polymer W solution preparation process>
In the polymer W solution preparation step, a polymer W solution in which the polymer W is dissolved in a solvent is prepared. Thus, prior to the step of finely dispersing the pigment described later (fine dispersion step), the liquid mixed with the pigment (polymer W solution) contains the polymer W, whereby the pigment particles used as a raw material are condensed. Efficiently and easily and reliably finely pulverize (crush) the aggregate, improve the productivity of the color filter ink, and stabilize the dispersion of the pigment in the final color filter ink. And the discharge stability of droplets can be made particularly excellent. Further, by using the polymer W solution, the fine dispersion step described later can be performed under relatively mild conditions, so that unintentional modification and deterioration of the constituent material of the color filter ink can be reliably prevented. be able to.

  Moreover, it is preferable to use a dispersing agent in this process. Thereby, the synergistic effect by using the polymer W and a dispersing agent together is exhibited more notably. When a dispersant is used in this step, the mixture containing the dispersant and the solvent is stirred (prior to the mixing of the polymer W and the solvent or when the polymer W and the solvent are mixed) (dispersion). It is preferable to predisperse the agent. Thereby, in the polymer W solution obtained, the association state of the dispersant can be released (unraveled), and the function of the dispersant can be exhibited more effectively. Incidentally, the acid value dispersant and the amine value dispersant described above originally have a property of being easily attracted to each other. However, as in this embodiment, the acid value dispersant and the amine value dispersant are used for fine dispersion (fine dispersion step) of the pigment. Prior to the dispersion of the dispersant, the acid value dispersant and the amine value dispersant are sufficiently dissolved in the association state even when the acid value dispersant and the amine value dispersant are used as the dispersant. Can be uniformly and stably adhered to the surface of the pigment particles, and can more reliably prevent aggregation between the dispersants, aggregation between the pigment particles, and the like. The discharge stability can be made particularly excellent.

In addition, when preparing the ink for color filters as what contains the polymer Z, it is preferable to use the polymer Z with the polymer W in this process.
The content of the dispersing agent in the polymer W solution prepared in this step (when multiple types of dispersing agents are included, the sum of the contents) is not particularly limited, but is preferably 5 to 30 wt%. More preferably, it is 6-25 wt%. When the content of the dispersant is a value within the above range, the effects as described above are more remarkably exhibited.

  Moreover, the content rate of the solvent in the polymer W solution prepared at this process is although it does not specifically limit, It is preferable that it is 40-80 wt%, and it is more preferable that it is 53-75 wt%. When the content of the solvent is within the above range, the effects as described above are more remarkably exhibited. In addition, as a solvent, what has the same composition as the liquid medium which comprises the target color filter ink may be used, and the thing of a different composition may be used. In this step, when a solvent having a composition different from the liquid medium constituting the target color filter ink is used as the solvent, for example, in a later step, diluted with a predetermined liquid (solvent), By substituting the liquid (solvent) accompanied by decompression treatment, heat treatment, etc., the liquid medium having a desired composition can be obtained in the finally obtained color filter ink.

In this step, the polymer W solution can be obtained by stirring the mixture of the above components using various stirrers.
Examples of the stirrer that can be used in this step include a uniaxial or biaxial mixer such as a disper mill.
Although the stirring processing time using a stirrer is not specifically limited, It is preferable that it is 1 to 30 minutes, and it is more preferable that it is 3 to 20 minutes. As a result, the productivity of the color filter ink is sufficiently improved, and the association state of the dispersant can be solved more effectively, and the dispersion stability of the pigment particles in the finally obtained color filter ink is stabilized. And the discharge stability of the color filter ink can be made particularly excellent.

  Moreover, the rotation speed of the stirring blade which the stirrer has in this step is not particularly limited, but is preferably 500 to 4000 rpm, and more preferably 800 to 3000 rpm. As a result, the productivity of the color filter ink can be sufficiently improved, and the association state of the dispersant can be solved more effectively, and the dispersion stability of the pigment particles in the finally obtained color filter ink can be improved. The property can be made particularly excellent. In addition, deterioration, modification, and the like due to heat or the like of the polymer W and the dispersant can be more reliably prevented.

<Fine dispersion process>
Next, a pigment is added to the polymer W solution obtained in the above step, and inorganic beads are added in multiple stages to perform fine dispersion treatment (fine dispersion step).
As described above, since the polymer W solution used in this step contains the polymer W, the pigment can be finely divided (disintegrated) efficiently, and the productivity of the color filter ink is particularly excellent. Can be. This is because, in this step, the polymer W is surrounded by the pigment so as to promote the micronization (pulverization) of the pigment and prevent the micronized pigment particles from reaggregating. Conceivable.

  In this embodiment, inorganic beads are added in multiple stages in the step of finely dispersing the pigment (fine dispersion step). By adding inorganic beads in multiple stages in the fine dispersion step, the pigment atomization efficiency can be made particularly excellent, and the pigment particles in the finally obtained color filter ink are sufficiently small It can be. In particular, when an acid value dispersant and an amine value dispersant are used in combination, the effect of using such a material and the effect of using a method having a polymer W solution preparation step and a multi-stage fine dispersion step are used. However, the color filter ink that is finally obtained is very excellent in the dispersion stability of the pigment and the ejection stability of the droplets, and has a very good contrast. It can be used for manufacturing color filters.

  This step may be performed by adding inorganic beads in multiple stages, and may be performed by adding inorganic beads in three or more stages, but it is preferable to add inorganic beads in two stages. . Thereby, the long-term dispersion stability of the pigment particles in the finally obtained color filter ink can be made sufficiently excellent, and the productivity of the color filter ink can be made particularly excellent.

In the following description, a method of adding inorganic beads in two stages, that is, a first treatment using the first inorganic beads and a second treatment using the second inorganic beads in the fine dispersion step. The method of performing will be described representatively.
The inorganic beads (first inorganic beads, second inorganic beads) used in this step may be made of any material as long as they are made of an inorganic material. Examples include beads made of zirconia (for example, Toray ceram pulverized ball (trade name), manufactured by Toray Industries, Inc.).

[First processing]
In this step, first, a pigment is added to the polymer W solution prepared in the above-described polymer W solution preparation step, and a first treatment for primary fine dispersion using first inorganic beads having a predetermined particle size is performed. .
The first inorganic beads used in the first treatment are preferably those having a larger particle diameter than the second inorganic beads used in the second treatment. Thereby, the efficiency of the atomization (fine dispersion) of the pigment as the whole fine dispersion process can be made particularly excellent.

  The average particle diameter of the first inorganic beads is not particularly limited, but is preferably 0.5 to 3.0 mm, more preferably 0.5 to 2.0 mm, and 0.5 to 1.2 mm. More preferably. When the average particle diameter of the first inorganic beads is a value within the above range, the efficiency of pigment atomization (fine dispersion) as a whole fine dispersion step can be made particularly excellent. On the other hand, if the average particle size of the first inorganic beads is less than the lower limit, the efficiency of atomization (small particle size) of the pigment particles in the first treatment is remarkably depending on the type of pigment and the like. A tendency to decline appears. When the average particle size of the first inorganic beads exceeds the upper limit, the efficiency of atomization (reduction in particle size) of the pigment particles in the first treatment can be made relatively excellent. However, the efficiency of the atomization (small particle size) of the pigment particles in the second treatment is lowered, and the efficiency of the atomization (fine dispersion) of the pigment as the entire fine dispersion process is lowered.

Although the usage-amount of a 1st inorganic bead is not specifically limited, It is preferable that it is 100-600 weight part with respect to polymer W solution: 100 weight part, and it is more preferable that it is 200-500 weight part.
Although the usage-amount of the pigment added to the polymer W solution is not specifically limited, It is preferable that it is 12 weight part or more with respect to polymer W solution: 100 weight part, and it is more preferable that it is 18-35 weight part. .

The first treatment can be performed by stirring using various stirrers in a state where the pigment and the first inorganic beads are added to the polymer W solution.
Examples of the stirrer that can be used in the first treatment include a media-type disperser such as a pearl mill, a uniaxial or biaxial mixer such as a disper mill, and the like.
The stirring process time using the stirrer (the processing time of the first process) is not particularly limited, but is preferably 10 to 120 minutes, and more preferably 15 to 40 minutes. Thereby, the atomization (fine dispersion) of the pigment can be efficiently advanced without reducing the productivity of the color filter ink.

  Moreover, the rotation speed of the stirring blade which the stirrer has in the first treatment is not particularly limited, but is preferably 1000 to 5000 rpm, and more preferably 1200 to 3800 rpm. Thereby, the atomization (fine dispersion) of the pigment can proceed more efficiently without reducing the productivity of the color filter ink. In addition, deterioration, modification, and the like due to heat or the like of the polymer W and the dispersant can be reliably prevented.

[Second processing]
After performing the first treatment, the second treatment using the second inorganic beads is performed. Thereby, a pigment dispersion in which pigment particles are sufficiently finely dispersed is obtained.
The second treatment may be performed in a state including the first inorganic beads, but it is preferable to remove the first inorganic beads prior to the second treatment. Thereby, the efficiency of the atomization (fine dispersion) of the pigment in the second treatment can be made particularly excellent. The removal of the first inorganic beads can be easily and reliably performed by a method such as filtration.

  It is preferable that the second inorganic beads used in the second treatment have a smaller particle diameter than the first inorganic beads used in the first treatment. Thereby, the pigment in the finally obtained color filter ink can be sufficiently atomized (finely dispersed), and the dispersion stability (long term) of the pigment particles in the color filter ink over a long period of time can be achieved. The dispersion stability can be particularly excellent, and the droplet discharge stability can be particularly excellent.

  The average particle size of the second inorganic beads is not particularly limited, but is preferably 0.03 to 0.3 mm, and more preferably 0.05 to 0.2 mm. When the average particle size of the second inorganic beads is within the above range, the efficiency of pigment atomization (fine dispersion) as a whole fine dispersion step can be made particularly excellent. On the other hand, if the average particle size of the second inorganic beads is less than the lower limit value, the efficiency of atomization (reduction in particle size) of the pigment particles in the second treatment is remarkably depending on the type of pigment or the like. A tendency to decline appears. If the average particle size of the second inorganic beads exceeds the upper limit, it may be difficult to sufficiently advance the atomization (fine dispersion) of the pigment particles.

Although the usage-amount of a 2nd inorganic bead is not specifically limited, It is preferable that it is 100-600 weight part with respect to polymer W solution: 100 weight part, and it is more preferable that it is 200-500 weight part.
The second treatment can be performed using various stirrers.
Examples of the stirrer that can be used in the second treatment include a media-type disperser such as a pearl mill, a uniaxial or biaxial mixer such as a disper mill, and the like.

The stirring time using the stirrer (second processing time) is not particularly limited, but is preferably 10 to 120 minutes, and more preferably 15 to 40 minutes. Thereby, the atomization (fine dispersion) of the pigment can be sufficiently advanced without reducing the productivity of the color filter ink.
Moreover, the rotation speed of the stirring blade which the stirrer in the second treatment has is not particularly limited, but is preferably 1000 to 5000 rpm, and more preferably 1200 to 3800 rpm. Thereby, the atomization (fine dispersion) of the pigment can proceed more efficiently without reducing the productivity of the color filter ink. In addition, it is possible to reliably prevent deterioration, modification, and the like of the dispersant due to heat.

In the above description, the case where fine dispersion processing is performed in two stages has been mainly described, but three or more stages of processing may be performed. In such a case, it is preferable that the inorganic beads used in the subsequent treatment have a smaller particle size than the inorganic beads used in the previous treatment. In other words, the average particle diameter of the inorganic beads (n-th inorganic beads) used in the n-th stage treatment is that of the inorganic beads ((n-1) inorganic beads) used in the (n-1) -stage treatment. The average particle size is preferably smaller. By satisfying such a relationship, the efficiency of atomization (fine dispersion) of the pigment particles can be made particularly excellent, and the particle size of the pigment particles in the finally obtained color filter ink can be reduced. It can be smaller.
In the fine dispersion step (for example, the first process and the second process), for example, a process such as dilution with a solvent may be performed as necessary.

<Resin material addition process>
The pigment dispersion obtained in the fine dispersion step as described above is mixed with an additional resin material (resin material addition step). Thereby, the ink for color filters is obtained.
Thus, in this embodiment, the polymer W constituting the resin material is used in the fine dispersion step, and an additional resin material is used after the fine dispersion step. Thereby, while making the efficiency of the fine dispersion process excellent, the dispersion stability of the pigment in the finally obtained color filter ink is excellent, the droplet discharge stability is excellent, and The content of the resin material contained in the color filter ink can be made suitable. Further, when a polymer other than the polymer W is used, the weight of the color filter ink finally obtained is prevented while preventing unintentional modification and deterioration of the polymer during preparation of the color filter ink. The coalescence can be included in the desired proportion.

As the resin material added to this step, for example, a polymer different from the polymer W such as the polymers X, Y, and Z as described above can be used. Further, the polymer W may be used in this step in addition to the polymer W solution preparation step described above.
This step is preferably performed in a state where the second inorganic beads used in the second treatment are removed. The removal of the second inorganic beads can be easily and reliably performed by a method such as filtration.

This step can be performed using various stirrers.
Examples of the stirrer that can be used in this step include a uniaxial or biaxial mixer such as a disper mill.
The stirring time using the stirrer (processing time in this step) is not particularly limited, but is preferably 1 to 60 minutes, more preferably 15 to 40 minutes.

Moreover, the rotation speed of the stirring blade which the stirrer has in this step is not particularly limited, but is preferably 1000 to 5000 rpm, and more preferably 1200 to 3800 rpm.
In this step, a liquid having a composition different from that of the solvent used in the step may be added. Thus, for the color filter having desired characteristics while suitably dissolving the polymer W in the polymer W solution preparation step, dispersing the dispersant, and finely dispersing the pigment particles in the fine dispersion step. Ink can be obtained reliably.

  In this step, at least a part of the solvent used in the above step is removed prior to mixing the pigment dispersion and the additional resin material or after mixing the pigment dispersion and the additional resin material. May be. Thereby, the composition of the solvent in the polymer W solution preparation step and the fine dispersion step can be different from the composition of the liquid medium in the finally obtained color filter ink. As a result, for the color filter having desired characteristics while suitably dissolving the polymer W in the polymer W solution preparation step, dispersing the dispersant, and finely dispersing the pigment particles in the fine dispersion step. Ink can be obtained reliably. The removal of the solvent can be performed, for example, by placing the target liquid in a reduced pressure atmosphere or heating.

<Ink set for color filter>
The color filter ink as described above is used for manufacturing a color filter by an ink jet method. Since the color filter usually corresponds to full color display, it has a plurality of colored portions (usually, three RGB colors corresponding to the three primary colors of light). In forming the colored portions of the plurality of colors, a plurality of types of color filter inks of corresponding colors are used. That is, an ink set (color filter ink set) including a plurality of colors of color filter inks is used for manufacturing a color filter. In the present invention, in the production of the color filter, the color filter ink as described above may be used as long as it can be used to form at least one colored portion, but it can be used to form colored portions of all colors. Is preferred.

  More specifically, the color filter ink set of the present invention includes a red ink containing a red colorant (particularly a red pigment), a green ink containing a green colorant (particularly a green pigment), And a blue ink containing a blue colorant (particularly, a blue pigment). Thereby, the color gamut of the color filter manufactured using the color filter ink set can be made particularly wide. Further, in the color filter, the luminance balance between the respective colors can be easily adjusted, and an image with particularly excellent image quality can be suitably displayed.

"Color filter"
Next, an example of a color filter manufactured using the color filter ink (color filter ink set) as described above will be described.
FIG. 1 is a cross-sectional view showing a preferred embodiment of the color filter of the present invention.
As shown in FIG. 1, the color filter 1 includes a substrate 11 and a colored portion 12 formed using the color filter ink described above. As the coloring portion 12, a first coloring portion 12A, a second coloring portion 12B, and a third coloring portion 12C having different colors are provided. A partition wall 13 is provided between the adjacent colored portions 12.

<Board>
The substrate 11 is a plate-like member having light transmittance, and has a function of holding the colored portion 12 and the partition wall 13.
The substrate 11 is preferably made of a substantially transparent material. Thereby, a clearer image can be formed by the light transmitted through the color filter 1.
The substrate 11 is preferably excellent in heat resistance and mechanical strength. Thereby, for example, deformation due to heat applied during the manufacture of the color filter 1 can be reliably prevented. Examples of the constituent material of the substrate 11 that satisfies such conditions include glass, silicon, polycarbonate, polyester, aromatic polyamide, polyamideimide, polyimide, norbornene-based ring-opening polymer, and hydrogenated products thereof.

<Coloring part>
The colored portion 12 is formed using the color filter ink (color filter ink set) as described above.
Since the colored portion 12 is formed using the color filter ink (color filter ink set) as described above, it is formed with a desired amount of ink and has a desired shape. The variation in characteristics among the pixels is small, and unintentional color mixing (mixing of plural kinds of color filter inks) is reliably prevented. For this reason, the color filter 1 has high reliability in which the occurrence of uneven color and uneven density is suppressed. Moreover, the color filter 1 is excellent in the coloring property of the coloring part 12, and excellent in contrast.
Each coloring portion 12 is provided in a cell 14 which is a region surrounded by a partition wall 13 which will be described later.

  The first colored portion 12A, the second colored portion 12B, and the third colored portion 12C are of different colors. For example, the first colored portion 12A can be a red filter region (R), the second colored portion 12B can be a green filter region (G), and the third colored portion 12C can be a blue filter region (B). One set of colored portions 12A, 12B, and 12C of different colors constitutes one pixel. In the color filter 1, a predetermined number of colored portions 12 are arranged in the horizontal direction and the vertical direction. For example, when the color filter 1 is a high-definition color filter, 1366 × 768 pixels are arranged, and when the color filter 1 is a full high-definition color filter, 1920 × 1080 pixels are arranged. In the case of a super high vision color filter, 7680 × 4320 pixels are arranged. Note that the color filter 1 may be provided with a spare pixel outside the effective area, for example.

<Partition wall>
A partition wall (bank) 13 is provided between the adjacent colored portions 12. Thereby, it can prevent reliably that the adjacent coloring parts 12 will mix colors, As a result, a clear image can be displayed reliably.
The partition wall 13 may be made of a transparent material, but is preferably made of a light-shielding material. Thereby, an image with excellent contrast can be displayed. The color of the partition wall (light shielding part) 13 is not particularly limited, but is preferably black. Thereby, the contrast of the displayed image can be made particularly excellent.

  The height of the partition wall 13 is not particularly limited, but is preferably larger than the thickness of the colored portion 12. Thereby, the color mixture between the adjacent coloring parts 12 can be prevented reliably. The specific thickness of the partition wall 13 is preferably 0.1 to 10 μm, and more preferably 0.5 to 3.5 μm. As a result, color mixing between the adjacent colored portions 12 can be reliably prevented, and the viewing angle characteristics of the image display device and electronic apparatus including the color filter 1 can be improved.

  The partition wall 13 may be made of any material, but for example, is preferably made mainly of a resin material. Thereby, the partition wall 13 can be easily formed as having a desired shape by a method as described later. Moreover, when the partition 13 has a function as a light-shielding part, it may include a light-absorbing material such as carbon black as a constituent material.

《Color filter manufacturing method》
Next, an example of a method for manufacturing the color filter 1 as described above will be described.
2 is a cross-sectional view showing a method for manufacturing a color filter, FIG. 3 is a perspective view showing a droplet discharge device used for manufacturing the color filter, and FIG. 4 is a droplet discharge means in the droplet discharge device shown in FIG. FIG. 5 is a diagram showing the bottom surface of the droplet ejection head in the droplet ejection device shown in FIG. 3, and FIG. 6 is a diagram showing the droplet ejection head in the droplet ejection device shown in FIG. It is a figure, (a) is a section perspective view, (b) is a sectional view.

  As shown in FIG. 2, in this embodiment, a substrate preparation step (1a) for preparing a substrate 11, a partition formation step (1b, 1c) for forming a partition 13 on the substrate 11, and a color filter by an ink jet method. An ink application step (1d) for applying the ink 2 to the region surrounded by the partition wall 13, and removing the liquid medium from the color filter ink 2 and curing the resin material to form a solid colored portion 12 Part forming step (1e).

<Board preparation process>
First, the substrate 11 is prepared (1a). The substrate 11 prepared in this step is preferably subjected to a cleaning process. Further, the substrate 11 prepared in this step is subjected to appropriate pretreatment such as chemical treatment with a silane coupling agent or the like, plasma treatment, ion plating, sputtering, gas phase reaction method, vacuum deposition, and the like. Also good.

<Partition forming process>
Next, the radiation-sensitive composition for forming the partition walls of the substrate 11 is applied to almost the entire one surface of the substrate 11 to form the coating film 3 (1b). In addition, after giving a radiation sensitive composition on the board | substrate 11, you may perform a prebaking process as needed. The pre-bake treatment can be performed, for example, under the conditions of heating temperature: 50 to 150 ° C. and heating time: 30 to 600 seconds.

Then, the partition 13 is formed by performing a post-exposure baking process (PEB) by irradiating with a radiation through a photomask, and further performing a developing process using an alkaline developer (1c). PEB can be performed, for example, under the conditions of heating temperature: 50 to 150 ° C., heating time: 30 to 600 seconds, and radiation irradiation intensity: 1 to 500 mJ / cm ² . Further, the development processing can be performed by, for example, a liquid piling method, a dipping method, a vibration dipping method, or the like, and the development processing time can be, for example, 10 to 300 seconds. Further, after the development process, a post-bake process may be performed as necessary. The post-bake treatment can be performed, for example, under the conditions of heating temperature: 150 to 280 ° C. and heating time: 3 to 120 minutes.

  Further, a liquid repellency treatment may be performed before the development treatment. Prior to the development treatment, a fluororesin may be applied by a stamp method or the like, or fluorine may be doped by a plasma polymerization treatment. By performing such a treatment, only the bank surface (upper surface in the drawing, the portion excluding the inner wall surface) is made liquid repellent and contributes to flattening. Further, a fluororesin having a light specific gravity may be added to the radiation-sensitive composition so as to be oriented only on the surface.

<Ink application process>
Next, the color filter ink 2 is applied to the cell 14 surrounded by the partition wall 13 by an inkjet method (1d).
This step is performed using a plurality of types of color filter inks 2 corresponding to the plurality of colored portions 12 to be formed. At this time, since the partition wall 13 is provided, it is reliably prevented that two or more kinds of color filter inks 2 are mixed.

Further, as described above, the color filter ink 2 contains a specific liquid medium and a specific resin material (polymer W) in combination, and is excellent in droplet ejection stability. For this reason, even when the color filter 1 to be manufactured is large or when a large number of color filters 1 are manufactured continuously, it is possible to reliably prevent problems such as flight bending. The droplet discharge amount can be easily and reliably controlled. As a result, it is possible to reliably prevent problems such as color mixing, color unevenness / density unevenness, and reduction in contrast ratio in the manufactured color filter 1.
The color filter ink 2 is discharged using a droplet discharge device as shown in FIGS.

  As shown in FIG. 3, the droplet discharge device 100 used in this step includes a tank 101 that holds the color filter ink 2 and a tube (liquid supply tube) 110 that feeds the color filter ink 2 in the tank 101. And a discharge scanning unit 102 to which the color filter ink 2 is supplied from the tank 101 via the tube 110. The ejection scanning unit 102 includes a droplet ejection unit 103 having a plurality of droplet ejection heads (inkjet heads) 114 mounted on a carriage 105, and a first position control device 104 (movement) that controls the position of the droplet ejection unit 103. Means), a stage 106 for holding the substrate 11 on which the partition wall 13 is formed in the above process (hereinafter also simply referred to as "substrate 11"), and a second position control device 108 (moving means) for controlling the position of the stage 106. ) And a control means 112. The tank 101 and a plurality of droplet discharge heads 114 in the droplet discharge means 103 are connected by a tube (liquid supply tube) 110, and a plurality of liquids are discharged from the tank 101 via the tube (liquid supply tube) 110. The color filter ink 2 is supplied to each of the droplet discharge heads 114 by compressed air. The tube (liquid feeding tube) 110 and the droplet discharge means 103 (droplet discharge head 114) are connected by a connection member (not shown). The connection between the tube (liquid feeding tube) 110 and the droplet discharge means 103 (droplet discharge head 114) is likely to be subjected to vibration energy associated with the liquid supply, and the color filter ink 2 being transported in the color filter ink 2 is conveyed. This is a place where air or the like is likely to be mixed. For this reason, butyl rubber is widely used as a constituent material of the connecting member, which is characterized by excellent stretchability, low gas permeability, and excellent vibration proofing properties, water resistance, acid resistance, alkali resistance, weather resistance, and the like. ing. Examples of the butyl rubber used as a material constituting the connecting member include butyl 065, 268, 269, 365 (EXXON MOBILE), 101-3, 301, 402 (LANXESS), JSR butyl (JSR), and the like. It is done.

  The color filter ink supplied to the droplet discharge head is discharged toward the cell of the substrate provided with the partition walls as will be described in detail later. Industrial use is completely different from that applied to printers (consumer use). For example, in order to perform mass production, it is required to eject a large amount of liquid droplets over a long period of time. In addition, liquid droplet ejection devices (industrial) used for manufacturing color filters generally have higher viscosity and higher specific gravity than inks used in printers (consumer products). The load applied to the droplet discharge device is much larger than that of a consumer printer. Since it is used under such severe conditions, conventionally, there has been a problem that the constituent members (parts) of the droplet discharge device are rapidly deteriorated and the droplet discharge amount becomes unstable. In particular, when deterioration occurs in the connection member as described above, bubbles are mixed into the color filter ink supplied to the droplet discharge head, causing variations in the droplet discharge amount, or ejection due to the presence of mixed bubbles. A phenomenon that causes a defect (so-called blank shot) occurs remarkably. When the above problems occur, the color density varies among a plurality of colored portions that are originally required to have the same color density, and as a result, the color at each part of the color filter is changed. Unevenness, density unevenness, etc. occur, and characteristics (particularly color characteristics such as contrast ratio and color gamut) vary among many color filters, resulting in low color filter reliability. It becomes a thing. In contrast, in the present invention, the color filter ink that satisfies the above-described conditions is used, so that the above-described problem can be effectively produced even when droplets are ejected for a long period of time. Can be prevented.

  The first position control device 104 moves the droplet discharge means 103 along the X-axis direction and the Z-axis direction orthogonal to the X-axis direction in response to a signal from the control means 112. Further, the first position control device 104 also has a function of rotating the droplet discharge means 103 around an axis parallel to the Z axis. In the present embodiment, the Z-axis direction is a direction parallel to the vertical direction (that is, the direction of gravitational acceleration). The second position controller 108 moves the stage 106 along the Y-axis direction orthogonal to both the X-axis direction and the Z-axis direction in response to a signal from the control unit 112. Further, the second position control device 108 also has a function of rotating the stage 106 around an axis parallel to the Z axis.

The stage 106 has a plane parallel to both the X-axis direction and the Y-axis direction. The stage 106 is configured so that the substrate 11 having the cells 14 to which the color filter ink 2 is to be applied can be fixed or held on the plane.
As described above, the droplet discharge means 103 is moved in the X-axis direction by the first position control device 104. On the other hand, the stage 106 is moved in the Y-axis direction by the second position control device 108. That is, the first position controller 104 and the second position controller 108 change the relative position of the droplet discharge head 114 with respect to the stage 106 (the substrate 11 held on the stage 106 and the droplet discharge means 103 are relative to each other). To go to).

The control unit 112 is configured to receive ejection data representing a relative position at which the color filter ink 2 is to be ejected from an external information processing apparatus.
As shown in FIG. 4, the droplet discharge means 103 has a plurality of droplet discharge heads 114 each having substantially the same structure, and a carriage 105 that holds these droplet discharge heads 114. In the present embodiment, the number of droplet discharge heads 114 held by the droplet discharge means 103 is eight. Each droplet discharge head 114 has a bottom surface provided with a plurality of nozzles 118 described later. The shape of the bottom surface of each droplet discharge head 114 is a polygon having two long sides and two short sides. The bottom surface of the droplet discharge head 114 held by the droplet discharge means 103 faces the stage 106 side, and the long side direction and the short side direction of the droplet discharge head 114 are respectively an X-axis direction and a Y-axis direction. Parallel to the direction.

  As shown in FIG. 5, the droplet discharge head 114 has a plurality of nozzles 118 arranged in the X-axis direction. The plurality of nozzles 118 are arranged such that the nozzle pitch HXP in the X-axis direction in the droplet discharge head 114 has a predetermined value. Although the specific value of nozzle pitch HXP is not specifically limited, For example, it can be set as 50-90 micrometers. Here, the “nozzle pitch HXP in the X-axis direction of the droplet discharge head 114” is a plurality of images obtained by projecting all the nozzles 118 in the droplet discharge head 114 onto the X-axis along the Y-axis direction. This corresponds to the pitch between nozzle images.

In the present embodiment, the plurality of nozzles 118 in the droplet discharge head 114 form a nozzle row 116A and a nozzle row 116B that both extend in the X-axis direction. The nozzle row 116A and the nozzle row 116B are arranged in parallel with a space therebetween. In the present embodiment, 90 nozzles 118 are aligned in the X-axis direction at regular intervals LNP in each of the nozzle row 116A and the nozzle row 116B. Although the specific value of LNP is not specifically limited, It can be set as 100-180 micrometers.
The position of the nozzle row 116B is shifted from the position of the nozzle row 116A by a half length of the nozzle pitch LNP in the positive direction in the X-axis direction (right direction in FIG. 5). Therefore, the nozzle pitch HXP in the X-axis direction of the droplet discharge head 114 is half the nozzle pitch LNP of the nozzle row 116A (or nozzle row 116B).

  Accordingly, the nozzle line density in the X-axis direction of the droplet discharge head 114 is twice the nozzle line density of the nozzle row 116A (or nozzle row 116B). In the present specification, “nozzle line density in the X-axis direction” means the number per unit length of a plurality of nozzle images obtained by projecting a plurality of nozzles on the X-axis along the Y-axis direction. It corresponds to. Of course, the number of nozzle rows included in the droplet discharge head 114 is not limited to two. The droplet discharge head 114 may include M nozzle rows. Here, M is a natural number of 1 or more. In this case, in each of the M nozzle rows, the plurality of nozzles 118 are arranged at a pitch that is M times the nozzle pitch HXP. Further, when M is a natural number of 2 or more, the other (M−1) nozzle rows are only i times as long as the nozzle pitch HXP with respect to one of the M nozzle rows. There is no overlap in the X-axis direction. Here, i is a natural number from 1 to (M−1).

  In the present embodiment, since each of the nozzle row 116 </ b> A and the nozzle row 116 </ b> B includes 90 nozzles 118, one droplet discharge head 114 has 180 nozzles 118. However, 5 nozzles at both ends of the nozzle row 116A are set as “pause nozzles”. Similarly, 5 nozzles at both ends of the nozzle row 116B are also set as “pause nozzles”. The color filter ink 2 is not ejected from these 20 “rest nozzles”. Therefore, 160 nozzles 118 out of 180 nozzles 118 in the droplet discharge head 114 function as nozzles that discharge the color filter ink 2.

As shown in FIG. 4, in the droplet discharge means 103, a plurality of the droplet discharge heads 114 are arranged in two rows along the X-axis direction. The droplet ejection heads 114 in one row and the droplet ejection heads 114 in the other row are arranged so as to partially overlap when viewed from the Y-axis direction in consideration of the rest nozzles. Thereby, in the droplet discharge means 103, the nozzle 118 that discharges the color filter ink 2 is continuous in the X-axis direction at the nozzle pitch HXP over the length of the dimension of the substrate 11 in the X-axis direction. It is configured.
In the droplet discharge means 103 of this embodiment, the droplet discharge head 114 is disposed so as to cover the entire length of the substrate 11 in the X-axis direction. A part of the length of the substrate 11 corresponding to the dimension in the X-axis direction may be covered.

  As shown in the figure, each droplet discharge head 114 is an inkjet head. More specifically, each droplet discharge head 114 includes a vibration plate 126 and a nozzle plate 128. Between the diaphragm 126 and the nozzle plate 128, a liquid pool 129 that is always filled with the color filter ink 2 supplied from the tank 101 through the hole 131 is located.

  In addition, a plurality of partition walls 122 are located between the diaphragm 126 and the nozzle plate 128. A portion surrounded by the diaphragm 126, the nozzle plate 128, and the pair of partition walls 122 is a cavity 120. Since the cavities 120 are provided corresponding to the nozzles 118, the number of the cavities 120 and the number of the nozzles 118 are the same. The color filter ink 2 is supplied from the liquid pool 129 to the cavity 120 through the supply port 130 positioned between the pair of partition walls 122.

  On the diaphragm 126, the vibrator 124 is positioned corresponding to each cavity 120. The vibrator 124 includes a piezoelectric element 124C and a pair of electrodes 124A and 124B that sandwich the piezoelectric element 124C. By applying a driving voltage between the pair of electrodes 124A and 124B, the color filter ink 2 is ejected from the corresponding nozzle 118. The shape of the nozzle 118 is adjusted so that the color filter ink 2 is ejected from the nozzle 118 in the Z-axis direction.

  In the droplet discharge head 114 (particularly, in the vicinity of the nozzle plate 128), generally, the ink supply unit and the head driving portion are made of a connecting material as an elastic material. Insufficient connection between the ink supply part and the head drive part causes ink leakage, prevents proper pressure from being applied to the color filter ink 2 in the cavity 120, or gas enters the cavity 120 from the outside. May cause problems. In order to prevent the occurrence of such a problem, fluorosilicone rubber is usually used as the connection material. Examples of such fluorosilicone rubber include Silastic LS (Dow Corning), FE251-U, 261-U, 271-U, 273-U, 281-U (Shin-Etsu Silicone), and Fluorsilicone 614002 (ERIKS). Etc.

The control means 112 (see FIG. 3) may be configured to give a signal to each of the plurality of vibrators 124 independently of each other. That is, the volume of the color filter ink 2 ejected from the nozzle 118 may be controlled for each nozzle 118 in accordance with a signal from the control unit 112. The control unit 112 can also set the nozzle 118 that performs the ejection operation during the application scan and the nozzle 118 that does not perform the ejection operation.
In this specification, a portion including one nozzle 118, a cavity 120 corresponding to the nozzle 118, and a vibrator 124 corresponding to the cavity 120 may be referred to as “ejection unit 127”. According to this notation, one droplet discharge head 114 has the same number of discharge units 127 as the number of nozzles 118.

Using the droplet discharge device 100 as described above, the color filter ink 2 corresponding to the colored portions 12 of the plurality of colors of the color filter 1 is applied to the cells 14. By using the apparatus as described above, the color filter ink 2 can be efficiently and selectively applied to the cells 14. In addition, as described above, the color filter ink 2 has excellent ejection stability, and even when droplets are ejected for a long period of time, the flight curve and the droplet ejection amount are low. Problems such as destabilization are extremely unlikely to occur. Therefore, a plurality of types of inks used to form colored portions of different colors are mixed (mixed), or between a plurality of colored portions that are originally required to have the same color density. Problems such as the occurrence of variations in color density can be reliably prevented. In the illustrated configuration, the droplet discharge device 100 has only one tank 101 for holding the color filter ink 2, a tube 110, etc., but the color filter 1 has a plurality of these members. It may have a plurality of colors corresponding to the colored portion 12. In manufacturing the color filter 1, a plurality of droplet discharge devices 100 corresponding to a plurality of color filter inks 2 may be used.
In the present invention, the droplet discharge head 114 may use an electrostatic actuator as a driving element instead of a piezoelectric element. In addition, the droplet discharge head 114 may be configured to use an electrothermal conversion element as a drive element and discharge the color filter ink by utilizing the thermal expansion of the material by the electrothermal conversion element.

<Colored part forming step (curing step)>
Next, the liquid medium is removed from the color filter ink 2 in the cell 14 and the resin material is cured to form a solid colored portion 12 (1e). Thereby, the color filter 1 is obtained.
This step is usually performed by heating. By performing this step by heating, the adhesion of the colored portion 12 to be formed to the substrate 11 can be made particularly excellent. Moreover, it can prevent reliably that a liquid medium remains in the colored part 12 formed. As a result, the durability and reliability of the color filter 1 can be made particularly excellent. Also, the productivity of the color filter 1 is improved.

The heating temperature in this step (the temperature of the heated substrate 11) is not particularly limited, but is preferably 100 to 280 ° C, and more preferably 110 to 250 ° C. Accordingly, the curing reaction of the resin material can be efficiently advanced while preventing the unintentional deterioration / decomposition of the constituent material of the colored portion 12, and the liquid medium can be suitably removed from the color filter ink 2.
Moreover, the heating time in this step is not particularly limited, but is preferably 30 to 190 minutes, and more preferably 40 to 130 minutes.

In this step, a plurality of heat treatments with different temperatures may be performed. Specifically, in this step, a first heat treatment that heats the substrate 11 at a relatively low temperature and a second heat treatment that heats the substrate 11 at a temperature higher than the first heat treatment are performed. May be.
As a result, unintentional deterioration / decomposition of the constituent material of the colored portion 12 is prevented, the productivity of the color filter 1 is improved, and the liquid medium remains in the formed colored portion 12. Can be prevented.

Further, in this step, by performing a first heat treatment for heating the substrate 11 at a relatively low temperature and a second heat treatment for heating the substrate 11 at a temperature higher than the first heat treatment, The flatness of the surface of the coloring part 12 can be made higher.
In such a case, by heating the substrate 11 at a relatively low temperature in the first heat treatment, the liquid medium is gently removed while preventing the convection of the color filter ink 2, and the color filter ink 2. The fluidity can be lost or reduced in a state in which the surface is flat. Moreover, the unintentional curing reaction of the resin material can be prevented by heating at a relatively low temperature.

In the second heat treatment, the liquid medium that could not be removed by the first heat treatment can be completely removed. In this step, when the color filter ink 2 is cured by reacting the resin material, the color filter ink 2 fixed in a flat state in the first heat treatment is efficiently cured in the shape. Can be made.
As described above, in the case where the first heat treatment and the second heat treatment are performed in this step, the treatment temperature in the first heat treatment (the temperature of the heated substrate 11) is not particularly limited, but 30 to It is preferable that it is 100 degreeC, and it is more preferable that it is 40-80 degreeC. Thus, the liquid medium can be suitably removed from the color filter ink 2 while reliably preventing convection of the color filter ink 2.

Moreover, the time of the first heat treatment is not particularly limited, but is preferably 3 to 50 minutes, and more preferably 5 to 40 minutes.
Moreover, the processing temperature (temperature of the heated substrate 11) in the second heat treatment is not particularly limited, but is preferably 120 to 280 ° C, and more preferably 150 to 250 ° C. Thereby, the liquid medium which could not be removed by the first heat treatment can be completely removed. Further, in this step, when the color filter ink 2 is cured by reacting a resin material (curable resin material), the color filter ink 2 fixed in a flat state in the first heat treatment is used. It can be efficiently cured in that shape.
The time for the second heat treatment is not particularly limited, but is preferably 25 to 150 minutes, and more preferably 30 to 100 minutes.

  Further, in this step, for example, treatment such as irradiation with active energy rays or placing the substrate 11 to which the color filter ink 2 is applied in a reduced pressure environment may be performed. By irradiating the active energy rays, the curing reaction of the resin material can be efficiently advanced, or even when the heating temperature is relatively low, the curing reaction of the resin material can be reliably advanced, It is possible to obtain such an effect that the adverse effect on the substrate 11 and the like can be prevented more reliably. As the active energy ray, light beams having various wavelengths, for example, ultraviolet rays, X-rays, g-rays, i-rays, excimer lasers, and the like can be used. In addition, by placing the substrate 11 to which the color filter ink 2 is applied in a reduced pressure environment, the liquid medium can be removed more efficiently, and the shape of the colored portion in the pixel (cell) can be ensured. Even when the heating temperature is relatively low, the liquid medium can be reliably removed, and the adverse effects on the substrate 11 and the like can be more reliably prevented. The effect of being done is acquired. Moreover, a colored part can be formed more efficiently by using a heat treatment and a decompression treatment in combination.

<Image display device>
Next, a preferred embodiment of a liquid crystal display device that is an image display device (electro-optical device) having the color filter 1 will be described.
FIG. 7 is a cross-sectional view showing a preferred embodiment of the liquid crystal display device. As shown in the figure, the liquid crystal display device 60 includes a color filter 1, a substrate (opposite substrate) 66 disposed on the surface side where the colored portion 12 of the color filter 1 is provided, a color filter 1 and a substrate 66. And a polarizing plate 67 provided on the side of the color filter 1 opposite to the surface facing the liquid crystal layer 62 (lower side in FIG. 7). And a polarizing plate 68 provided on the surface opposite to the surface facing the liquid crystal layer 62 of the substrate 66 (upper side in FIG. 7). A common electrode 61 is provided on the surface of the color filter 1 on which the colored portion 12 and the partition wall 13 are provided (the surface opposite to the surface of the colored portion 12 and the partition wall 13 facing the substrate 11). On the surface of the (opposite substrate) 66 facing the liquid crystal layer 62 and the color filter 1, pixel electrodes 65 are arranged in a matrix at positions corresponding to the colored portions 12 of the color filter 1. Further, an alignment film 64 is provided between the common electrode 61 and the liquid crystal layer 62, and an alignment film 63 is provided between the substrate 66 (pixel electrode 65) and the liquid crystal layer 62.

The substrate 66 is a substrate having optical transparency with respect to visible light, and is, for example, a glass substrate.
The common electrode 61 and the pixel electrode 65 are made of a material having optical transparency to visible light, and are made of, for example, ITO.
Although not shown in the drawing, a plurality of switching elements (for example, TFT: thin film transistor) are provided so as to correspond to each pixel electrode 65. For each pixel electrode 65 corresponding to each coloring portion 12, by controlling the voltage application state between the common electrode 61, in the region corresponding to each coloring portion 12 (each pixel electrode 65), Light transmittance can be controlled.

  In the liquid crystal display device 60, light emitted from a backlight (not shown) enters from the polarizing plate 68 side (upper side in FIG. 7). And the light which permeate | transmitted the liquid crystal layer 62 and entered into each coloring part 12 (12A, 12B, 12C) of the color filter 1 is polarized as light of the color corresponding to each coloring part 12 (12A, 12B, 12C). The light is emitted from the plate 67 (lower side in FIG. 7).

  As described above, since the colored portion 12 is formed using the color filter ink 2 (color filter ink set) of the present invention, variation in characteristics between colors and between pixels is suppressed. It is a thing. As a result, the liquid crystal display device 60 can stably display an image in which color unevenness, density unevenness, and the like at each part are suppressed. Moreover, since the coloring part 12 is formed using the color filter ink of the present invention, it is excellent in contrast.

"Electronics"
An image display device (electro-optical device) 1000 such as a liquid crystal display device having the color filter 1 as described above can be used for display portions of various electronic devices.
FIG. 8 is a perspective view showing the configuration of a mobile (or notebook) personal computer to which the electronic apparatus of the present invention is applied.

In this figure, a personal computer 1100 includes a main body portion 1104 having a keyboard 1102 and a display unit 1106. The display unit 1106 is supported by the main body portion 1104 so as to be rotatable via a hinge structure portion. Yes.
In the personal computer 1100, the display unit 1106 includes an image display device 1000.

FIG. 9 is a perspective view showing a configuration of a mobile phone (including PHS) to which the electronic apparatus of the present invention is applied.
In this figure, a cellular phone 1200 includes a plurality of operation buttons 1202, an earpiece 1204 and a mouthpiece 1206, and an image display device 1000 in a display unit.
FIG. 10 is a perspective view showing the configuration of a digital still camera to which the electronic apparatus of the present invention is applied. In this figure, connection with an external device is also simply shown.

Here, an ordinary camera sensitizes a silver salt photographic film with a light image of a subject, whereas a digital still camera 1300 photoelectrically converts a light image of a subject with an image sensor such as a CCD (Charge Coupled Device). An imaging signal (image signal) is generated.
On the back of a case (body) 1302 in the digital still camera 1300, an image display device 1000 is provided in a display unit, and is configured to display based on an image pickup signal from a CCD, and a finder that displays an object as an electronic image. Function as.

A circuit board 1308 is installed inside the case. The circuit board 1308 is provided with a memory that can store (store) an imaging signal.
A light receiving unit 1304 including an optical lens (imaging optical system), a CCD, and the like is provided on the front side of the case 1302 (on the back side in the illustrated configuration).
When the photographer confirms the subject image displayed on the display unit and presses the shutter button 1306, the CCD image pickup signal at that time is transferred and stored in the memory of the circuit board 1308.

  In the digital still camera 1300, a video signal output terminal 1312 and an input / output terminal 1314 for data communication are provided on the side surface of the case 1302. As shown in the figure, a television monitor 1430 is connected to the video signal output terminal 1312 and a personal computer 1440 is connected to the input / output terminal 1314 for data communication as necessary. Further, the imaging signal stored in the memory of the circuit board 1308 is output to the television monitor 1430 or the personal computer 1440 by a predetermined operation.

  The electronic device of the present invention includes, for example, a television (for example, a liquid crystal television), a video camera, a viewfinder type, a monitor in addition to the above-described personal computer (mobile personal computer), mobile phone, and digital still camera. Direct-view video tape recorder, laptop personal computer, car navigation system, pager, electronic notebook (including communication function), electronic dictionary, calculator, electronic game device, word processor, workstation, videophone, security TV monitor , Electronic binoculars, POS terminals, devices equipped with touch panels (for example, cash dispensers of financial institutions, automatic ticket vending machines), medical devices (for example, electronic thermometers, blood pressure monitors, blood glucose meters, electrocardiographic display devices, ultrasonic diagnostic devices, endoscopy) Mirror display device), fish finder, each Measuring instruments, gauges (e.g., gages for vehicles, aircraft, and ships), a flight simulator, various monitors, and a projection display such as a projector. In particular, televisions have a remarkable tendency to increase the size of display portions in recent years. However, in electronic devices having such a large display portion (for example, a display portion having a diagonal length of 80 cm or more), conventional color filter inks are used. When the color filter manufactured using the above is applied, problems such as uneven color and uneven density are particularly likely to occur. However, if the present invention is applied, such problems can be reliably prevented. That is, when applied to an electronic device having a large display unit as described above, the effects of the present invention are more remarkably exhibited.

As mentioned above, although this invention was demonstrated based on suitable embodiment, this invention is not limited to these.
For example, in the above-described embodiment, after applying the color filter ink corresponding to the colored portion of each color into the cell, the liquid medium is removed from the color filter ink of each color in the cell in a lump, and the resin Although it has been described that the material is cured, that is, the colored portion forming step (curing step) is performed only once, the ink application step and the colored portion forming step may be repeatedly performed corresponding to each color. Good.

  In addition, each unit constituting the color filter, the image display device, and the electronic device can be replaced with an arbitrary one that exhibits the same function, or another configuration can be added. For example, in the color filter of the present invention, a protective film that covers the colored portion may be provided on the surface of the colored portion opposite to the surface facing the substrate. Thereby, damage, deterioration, etc. of a coloring part can be prevented more effectively.

  Further, the color filter ink of the present invention may be manufactured by any method, and is not limited to the one manufactured by using the method described above. For example, in the above-described embodiment, the polymer W solution preparation step and the multi-stage fine dispersion step have been described. However, the color filter ink of the present invention does not have the polymer W solution preparation step. Alternatively, it may be produced by a method having a fine dispersion step that is not multistage. In the embodiment described above, the case where a pigment is used as the colorant has been mainly described. However, for example, a dye may be used instead of the pigment.

  In the above-described embodiment, the case where the color filter ink set includes the three types (three colors) of color filter inks corresponding to the three primary colors of light has been mainly described, but the color filter ink set is configured. The number and type (color) of the color filter ink to be performed are not limited to those described above. For example, in the present invention, the color filter ink set may include four or more color filter inks.

Next, specific examples of the present invention will be described.
[1] Synthesis of polymer (Synthesis Example 1)
In a reaction vessel (flask) equipped with a stirrer, reflux condenser, dropping funnel, nitrogen inlet tube and thermometer, 180 parts by weight of triethylene glycol diacetate as a solvent (solvent) was added and heated to 85 ° C. Subsequently, in the flask, the monomer component (compound) w1: 188 parts by weight represented by the above formula (1), the monomer component (compound) w2: 34 weights represented by the above formula (2). Parts: monomer component (compound) w3: 74 parts by weight represented by formula (3) above, monomer component (compound) w4: 74 parts by weight represented by formula (4) above, as radical initiator A solution prepared by dissolving 64 parts by weight of azobisdimethylvaleronitrile in 386 parts by weight of triethylene glycol diacetate was added dropwise over 5 hours using a dropping pump, and further aged for 3 hours. Then, it cooled to room temperature and obtained the polymer W1 as the polymer W represented by the said Formula (17) including the monomer components w1, w2, w3, and w4.

(Synthesis Examples 2 to 16)
The above synthesis examples except that the type and amount of each component (including solvent (solvent)) used in the synthesis of the polymer were changed and adjusted, and the composition and weight average molecular weight of the polymer were changed as shown in Table 1. The same operation as 1 was performed. As a result, 14 types of polymers (polymers W2 to W16) were obtained.
(Synthesis Examples 17-20)
The above synthesis examples except that the type and amount of each component (including solvent (solvent)) used in the synthesis of the polymer were changed and adjusted, and the composition and weight average molecular weight of the polymer were changed as shown in Table 1. The same operation as 1 was performed. As a result, four types of polymers (polymers W′1 to W′4) were obtained.

(Synthesis Example 21)
In a reaction vessel (flask) equipped with a stirrer, reflux condenser, dropping funnel, nitrogen introduction tube and thermometer, 314 parts by weight of triethylene glycol diacetate as a solvent (solvent) was placed and heated to 90 ° C. Subsequently, 2,2′-azobis (isobutyronitrile) (AIBN) as a radical initiator: 20 parts by weight and triethylene glycol diacetate (solvent): 30 parts by weight were added to the flask. The monomer component (compound) represented by the above formula (5) x1: 180 parts by weight, the monomer component (compound) represented by the above formula (6) x2: 90 parts by weight, the above formula (7 ) Monomer component (compound) x3: 15 parts by weight, monomer component (compound) x4: 15 parts by weight represented by the above formula (8), 2,2′-azobis (isobutyro) Nitrile) (AIBN): A solution prepared by dissolving 50 parts by weight in triethylene glycol diacetate: 200 parts by weight was added dropwise over 5 hours using a dropping pump, and further aged for 4 hours. Then, it cooled to room temperature and obtained the polymer X1 as the polymer X represented by the said Formula (18) including the monomer components x1, x2, x3, x4.

(Synthesis Examples 22 to 32)
The above synthesis examples except that the type and amount of each component (including solvent (solvent)) used in the synthesis of the polymer were changed and adjusted, and the composition of the polymer and the weight average molecular weight were changed as shown in Table 2. The same operation as 21 was performed. As a result, 11 types of polymers (polymers X2 to X12) were obtained.
(Synthesis Example 33)
In a reaction vessel (flask) equipped with a stirrer, reflux condenser, dropping funnel, nitrogen introduction tube and thermometer, 314 parts by weight of triethylene glycol diacetate as a solvent (solvent) was placed and heated to 90 ° C. Subsequently, 2,2′-azobis (isobutyronitrile) (AIBN) as a radical initiator: 20 parts by weight and triethylene glycol diacetate (solvent): 30 parts by weight were added to the flask. In addition, monomer component (compound) y1 represented by the above formula (9) y1: 200 parts by weight, monomer component (compound) y2 represented by the above formula (10): 100 parts by weight, 2,2 ′ -Azobis (isobutyronitrile) (AIBN): A solution prepared by dissolving 50 parts by weight in triethylene glycol diacetate: 200 parts by weight was added dropwise over 5 hours using a dropping pump, and further aged for 4 hours. Then, it cooled to room temperature and obtained the polymer Y1 as the polymer Y containing the monomer components y1 and y2 and represented by the said Formula (19).

(Synthesis Examples 34 to 37)
The above synthesis examples except that the type and amount of each component (including solvent (solvent)) used in the synthesis of the polymer were changed and adjusted, and the composition of the polymer and the weight average molecular weight were changed as shown in Table 2. The same operation as 33 was performed. As a result, four types of polymers (polymers Y2 to Y5) were obtained.
(Synthesis Example 38)
Into a reaction vessel (flask) equipped with a stirrer, reflux condenser, dropping funnel, nitrogen introduction tube and thermometer, 246 parts by weight of triethylene glycol diacetate as a solvent (solvent) was placed and heated to 80 ° C. Subsequently, in the flask, the monomer component (compound) represented by the formula (11) z1: 276 parts by weight, the monomer component (compound) represented by the formula (12) z2: 51 weights. A solution prepared by dissolving 39 parts by weight of azobisdimethylvaleronitrile as a radical initiator in 360 parts by weight of methoxybutyl acetate was added dropwise over 5 hours using a dropping pump, and further aged for 3 hours.
Thereafter, 26 parts by weight of glycidyl methacrylate and 2 parts by weight of methoquinone were added to the flask and reacted at 110 ° C. for 10 hours. Then, it cooled to room temperature and obtained the polymer Z1 as the polymer Z represented by the said Formula (20) including the monomer components z1, z2, and z3.

(Synthesis Examples 39 to 42)
The above synthesis examples except that the type and amount of each component (including solvent (solvent)) used in the synthesis of the polymer were changed and adjusted, and the composition of the polymer and the weight average molecular weight were changed as shown in Table 2. The same operation as 38 was performed. As a result, four types of polymers (polymers Z2 to Z5) were obtained.
Tables 1 and 2 collectively show the ratio of each monomer component constituting each polymer synthesized in Synthesis Examples 1 to 40, and the weight average molecular weight Mw of each polymer. In addition, as for the polymer synthesize | combined as mentioned above, all had dispersity (weight average molecular weight Mw / number average molecular weight Mn) in the range of 1-3.

[2] Preparation of color filter ink (color filter ink set) (Example 1)
Dispersic 111 as an acid value dispersant, Dispersic 166 as an amine value dispersant, polymer W1, and triethylene glycol as a solvent (liquid medium in color filter ink) for dissolving the polymer W1 The diacetate was put into a stirrer (uniaxial mixer) having an internal volume of 400 cc, and stirred for 10 minutes with a disper mill to obtain a polymer W solution (polymer W solution preparation step). At this time, the rotation speed of the stirring blade of the stirrer was set to 2000 rpm.

Next, as described below, the polymer W solution obtained in the polymer W solution preparation step was subjected to a fine dispersion step in which a pigment was added and inorganic beads were added in multiple stages to perform a fine dispersion treatment. .
First, a pigment was added to the obtained polymer W solution and stirred for 10 minutes. At this time, the rotation speed of the stirring blade of the stirrer was set to 2000 rpm. Examples of the pigment include C.I. I. Pigment Red 177 and a pigment derivative represented by the above formula (14); I. A mixture of Pigment Red 254 and the pigment derivative represented by the above formula (15) and a powder of a sulfonated pigment derivative having a chemical structure represented by the above formula (16) were used. At this time, the mixture was diluted with triethylene glycol diacetate so that the pigment content in the mixture of the polymer W solution and the pigment was 16 wt%.

Next, inorganic beads having an average particle diameter of 0.8 mm (first inorganic beads, manufactured by Zirconia, “Toray ceramic pulverized ball” (trade name), manufactured by Toray Industries, Inc.) are added and stirred at room temperature for 30 minutes. First-stage distributed processing (first processing) was performed. At this time, the rotation speed of the stirring blade of the stirrer was set to 2000 rpm.
Next, the inorganic beads (first inorganic beads) are removed by filtration using a filter (“PALL HDCII Membrane Filter”, manufactured by PALL). Inorganic beads, manufactured by zirconia, “Toray ceramic pulverized ball” (trade name), manufactured by Toray Industries, Inc.) were added, and the mixture was further stirred for 30 minutes to perform the second stage dispersion treatment (second treatment). At this time, the rotation speed of the stirring blade of the stirrer was set to 2000 rpm. At this time, the resulting pigment dispersion was diluted with triethylene glycol diacetate so that the pigment content was 13 wt%.

Thereafter, the inorganic beads (second inorganic beads) were removed by filtration using a filter (“PALL HDCII Membrane Filter” (trade name), manufactured by PALL) to obtain a pigment dispersion.
Next, the polymer X1 and the polymer Y1 were added to the pigment dispersion obtained as described above and mixed (resin material addition step). This step was performed by putting each of the above materials into a stirrer (uniaxial mixer) having an internal capacity of 400 cc and stirring for 10 minutes with a disper mill. At this time, the rotation speed of the stirring blade of the stirrer was set to 2000 rpm. As a result, the intended red color filter ink (R ink) was obtained. The content ratio of the pigment of the obtained R ink was 7.3 wt%.

  In addition, the color filter ink (G ink) and the blue color filter ink (B ink) are the same as the red color filter ink except that the type of pigment and the amount of each component used are changed. Was prepared. As a result, an ink set composed of three colors of R, G, and B was obtained. The average particle diameter of the pigment constituting the R ink, the average particle diameter of the pigment constituting the G ink, and the average particle diameter of the pigment constituting the B ink were 70 nm, 70 nm, and 70 nm, respectively. Examples of the G ink pigment include C.I. I. Pigment Green 58 and a sulfonated pigment derivative powder having a chemical structure represented by the above formula (16) were used, and the pigment content in the final G ink was 10.1 wt%. Examples of the B ink pigment include C.I. I. Pigment Blue 15: 6 was used, and the pigment content in the final B ink was 4.9 wt%.

(Examples 2 to 11)
A color filter ink (color filter ink set) was prepared in the same manner as in Example 1 except that the type and content of the color filter ink material were changed as shown in the table.
(Comparative Examples 1-10)
A color filter ink (color filter ink set) was prepared in the same manner as in Example 1 except that the type and content of the color filter ink material were changed as shown in the table.

(Comparative Example 11)
A commercially available trisphenolmethane type epoxy resin (manufactured by Nippon Kayaku Co., Ltd., EPPN-502H) was used in place of the polymer X and the polymer Y, and the polymer W was not used. A color filter ink (color filter ink set) was prepared.
In each of the above Examples and Comparative Examples, when the polymers W, Z, and W ′ are used, they are used in the polymer W solution preparation step (or a step performed at a timing corresponding thereto). The polymers X and Y were used in the resin material addition step (or a step performed at a timing corresponding thereto).

  Tables 3 to 5 collectively show the types and contents of the constituent components of the color filter inks in the above Examples and Comparative Examples. In the table, C.I. I. Pigment Red 177 is “PR177”, C.I. I. Pigment Red 254 is "PR254", C.I. I. Pigment Red 177 and a pigment derivative represented by the formula (14) “PR177D”, C.I. I. Pigment Red 254 and a pigment derivative represented by the formula (15) “PR254D”, and a powder composed of the pigment derivative represented by the formula (16) is “SPD”, C.I. I. Pigment Green 58 is changed to “PG58”, C.I. I. Pigment Green 36 is “PG36”, C.I. I. Pigment Blue 15: 6 is changed to “PB15: 6”, C.I. I. Pigment Yellow 150 is changed to “PY150”, C.I. I. Pigment Violet 23 is “PV23”, Dispersic 111 (acid value: 50 KOHmg / g) is “DA1”, Dispersic 2095 (acid value: 13 KOHmg / g) is “DA2”, Dispersic P104 (acid value: 360 KOHmg / g) ) “DA3”, Dispersic 166 (amine number: 115 KOHmg / g) “DA4”, Dispersic 9075 (amine number: 12 KOHmg / g) “DA5”, Solsperse 41000 “DA6”, Dispersic LPN6919 “ DA7 ", Hinoact T8000E" DA8 ", Triethylene glycol diacetate" S1 ", Dipropylene glycol dimethyl ether" S2 ", Diethylene glycol isopropyl methyl ether" S3 ", Dipropylene glycol Butyl methyl ether "S4", ethyl octanoate "S5", propylene glycol diacetate "S6", diethylene glycol monoethyl ether acetate "S7", propylene glycol methyl ether acetate "S8", dimethyl glutarate Is "S9", ethyl ethoxypropionate is "S10", propylene carbonate is "S11", and trisphenolmethane type epoxy resin (Nippon Kayaku Co., Ltd., EPPN-502H) is indicated by "R1". In addition, C. used in each Example and each comparative example. I. The content of the pigment derivative represented by the formula (14) in the mixture of Pigment Red 177 and the pigment derivative represented by the formula (14) was 0.1 to 10 wt%. In addition, C.I. used in the above Examples and Comparative Examples. I. The content of the pigment derivative represented by the formula (15) in the mixture of Pigment Red 254 and the pigment derivative represented by the formula (15) was 0.1 to 10 wt%. The acid value of the dispersant was determined by a method based on DIN EN ISO 2114, and the amine value was determined by a method based on DIN 16945.

  Tables 3 to 5 also show the viscosity of the color filter ink, the swelling rate of butyl rubber, and the swelling rate of silicone rubber. In the column of “Viscosity” in the table, the viscosity at 25 ° C. of the color filter ink measured according to JIS Z8809 using a vibration viscometer was shown. In the column of “swelling rate of butyl rubber”, a disk-shaped test piece having a diameter of 3 mm and a thickness of 2 mm made of solid butyl rubber (manufactured by JSR, JSR butyl) in a sealed liquid medium. Shows the swelling rate of the butyl rubber when allowed to stand for 15 days in an environment of 40 ° C. under atmospheric pressure. In the column of “silicone rubber swelling rate”, the solid-state liquid medium contains Swelling rate of the silicone rubber when a 3 mm diameter x 2 mm thick disc-shaped test piece made of silicone (Fluorisone 614002, manufactured by ERIKS) is allowed to stand in an atmosphere of 40 ° C. for 15 days. showed that.

[3] Storage stability evaluation of color filter ink (durability evaluation)
[3.1] Appearance change after heat treatment The color filter inks of the above Examples and Comparative Examples were left to stand in an environment of 55 ° C. for 8 days and then visually observed. Evaluation was made according to the criteria.

A: No change from before heating is observed.
B: Almost no aggregation or sedimentation of pigment particles is observed.
C: Slight aggregation / precipitation of pigment particles is observed.
D: Aggregation / sedimentation of pigment particles is clearly observed.
E: Aggregation / sedimentation of pigment particles is noticeable.

[3.2] Change in Viscosity For the color filter inks of the above Examples and Comparative Examples, the viscosity (kinematic viscosity) after standing for 8 days in an environment at 55 ° C. was measured, and the viscosity immediately after production. The difference was obtained. That is, when the viscosity immediately after production is ν ₀ [mPa · s] and the viscosity after standing in an environment of 55 ° C. for 8 days is ν ₁ [mPa · s], it is represented by ν ₁ −ν _0. The value was determined. The values thus obtained were evaluated according to the following five-stage criteria.

A: The value of ν ₁ −ν ₀ is less than 0.2 mPa · s.
B: The value of ν ₁ −ν ₀ is 0.2 mPa · s or more and less than 0.5 mPa · s.
C: The value of ν ₁ −ν ₀ is 0.5 mPa · s or more and less than 0.8 mPa · s.
D: The value of ν ₁ −ν ₀ is 0.8 mPa · s or more and less than 1.0 mPa · s.
E: The value of ν ₁ −ν ₀ is 1.0 mPa · s or more.

[4] Droplet discharge stability evaluation (discharge stability evaluation)
Color filter inks obtained in the above Examples and Comparative Examples (color filter inks immediately after production and color filter inks left in a 55 ° C. environment for 8 days (color filters left in a heated environment) The ink was evaluated by a test as shown below.

[4.1] Landing position accuracy evaluation Prepared are a droplet discharge device as shown in FIGS. 3 to 6 installed in a chamber (thermal chamber), and an ink set for a color filter of each of the examples and comparative examples, With the drive waveform of the piezo element optimized, 500,000 (500000 drops) of droplets were continuously discharged from each nozzle of the droplet discharge head for each ink. For the 500,000 droplets discharged from the designated nozzle near the center of the droplet discharge head, the average value of the deviation amount d from the center target position of the center position of each landed droplet is obtained, and the following four steps Evaluation was performed according to the criteria of It can be said that the smaller the value is, the more effectively the occurrence of flight bending is prevented. As a droplet discharge device, a tube (liquid feeding tube) and a droplet discharge means (droplet discharge head) are connected by a connecting member made of butyl rubber (manufactured by JSR, JSR butyl), and the inside of the droplet discharge head The ink supply unit and the head drive unit were connected with a fluorosilicone rubber (Fluorsilicone 614002, manufactured by ERIKS) as a connection material.

A: The average value of the shift amounts d is less than 0.05 μm.
B: The average value of the shift amounts d is 0.05 μm or more and less than 0.11 μm.
C: The average value of the shift amount d is 0.11 μm or more and less than 0.16 μm.
D: The average value of the shift amounts d is 0.16 μm or more.

[4.2] Evaluation of stability of droplet discharge amount Droplet discharge device as shown in FIGS. 3 to 6 installed in a chamber (thermal chamber), and ink set for color filter of each of the above examples and comparative examples Were prepared, and 500,000 droplets (500000 droplets) were continuously discharged from each nozzle of the droplet discharge head for each ink in a state where the drive waveform of the piezoelectric element was optimized. For the two specified nozzles on the left and right ends of the droplet discharge head, the total weight of the discharged droplets is obtained, and the absolute value ΔW [ng] of the difference between the average discharge amounts of the droplets discharged from the two nozzles is calculated. Asked. The ratio (ΔW / W _T ) of this ΔW to the target discharge amount W _T [ng] of the droplet was determined and evaluated according to the following four criteria. As the value of [Delta] W / W _T is small, it can be said that the greater the stability of the droplet discharge amount. As a droplet discharge device, a tube (liquid feeding tube) and a droplet discharge means (droplet discharge head) are connected by a connecting member made of butyl rubber (manufactured by JSR, JSR butyl), and the inside of the droplet discharge head The ink supply unit and the head drive unit were connected with a fluorosilicone rubber (Fluorsilicone 614002, manufactured by ERIKS) as a connection material.

A: The value of ΔW / _{W T} is less than .040.
B: The value of ΔW / _{W T} is less than 0.040 than 0.380.
C: The value of ΔW / _{W T} is less than 0.380 than 0.700.
D: The value of ΔW / _{W T} is 0.700 or more.

[4.3] Evaluation of intermittent printing performance Prepared are a droplet discharge device as shown in FIG. 3 to FIG. 6 installed in a chamber (thermal chamber) and an ink set for a color filter of each of the above examples and comparative examples, With the drive waveform of the piezo element optimized, 10000 droplets (10000 droplets) are continuously discharged from each nozzle of the droplet discharge head for each ink, and then the droplets are discharged for 100 seconds. Interrupted (first sequence). Thereafter, similarly, the operation of continuously discharging the droplets and interrupting the discharge of the droplets were repeated. For the specified nozzle near the center of the droplet discharge head, the average weight W ₁ [ng] of the droplets discharged in the first sequence and the average weight W ₃₀ [ng] of the droplets discharged in the 30th sequence And asked. Then, the ratio (| W ₁ −W ₃₀ | / W _T ) of the absolute value of the difference between W ₁ and W ₃₀ with respect to the target discharge amount W _T [ng] of the droplet is obtained, and the following three criteria are used. ,evaluated. | _W 1 _-W 30 | as the value of / _{W T} is small, it can be said to be excellent in intermittent printing performance (stability of the droplet discharge quantity). As a droplet discharge device, a tube (liquid feeding tube) and a droplet discharge means (droplet discharge head) are connected by a connecting member made of butyl rubber (manufactured by JSR, JSR butyl), and the inside of the droplet discharge head The ink supply unit and the head drive unit were connected with a fluorosilicone rubber (Fluorsilicone 614002, manufactured by ERIKS) as a connection material.
_A: | _{W 1} -W 20 | value of / _{W T} is less than 0.055.
_B: | _{W 1} -W 20 | values of / _{W T} is less than 0.055 or 0.680.
_C: | _{W 1} -W 20 | value of / _{W T} is 0.680 or more.

[4.4] Continuous Discharge Test Using a droplet discharge device as shown in FIGS. 3 to 6 installed in a chamber (thermal chamber), the color filter ink set of each of the above examples and comparative examples, 25 Each ink constituting the color filter ink set was discharged by continuously operating the droplet discharge device for 108 hours in an environment of 35 ° C. and 35% RH. As a droplet discharge device, a tube (liquid feeding tube) and a droplet discharge means (droplet discharge head) are connected by a connecting member made of butyl rubber (manufactured by JSR, JSR butyl), and the inside of the droplet discharge head The ink supply unit and the head drive unit were connected with a fluorosilicone rubber (Fluorsilicone 614002, manufactured by ERIKS) as a connection material.
The nozzle clogging rate ([(number of clogged nozzles) / (total number of nozzles)] × 100) obtained after continuous operation is found and the nozzles are clogged. As for No. 1, it was examined whether or not clogging can be eliminated by a cleaning member made of a plastic material. The results were evaluated according to the following four criteria.

A: No nozzle clogging occurs.
B: The occurrence rate of nozzle clogging is less than 0.7% (excluding zero), and clogging can be eliminated by cleaning.
C: The occurrence rate of nozzle clogging is 0.7% or more and less than 0.9%, and clogging can be eliminated by cleaning.
D: The occurrence rate of nozzle clogging is 0.9% or more, or clogging cannot be eliminated by cleaning.
In addition, said evaluation was performed on the same conditions about each Example and each comparative example.

[5] Production of color filter Color filter ink (color filter ink immediately after production) obtained in each of the above examples and comparative examples, and color filter ink left in a 55 ° C. environment for 8 days ( A color filter was produced in the following manner using a color filter ink left in a heating environment.

First, a soda glass substrate (G5 size: 1100 × 1300 mm) on which a silica (SiO ₂ ) film for preventing elution of sodium ions was formed on both surfaces was prepared and subjected to a cleaning treatment.
Next, the radiation-sensitive composition for forming partition walls containing carbon black was applied to the entire surface of one of the cleaned substrates to form a coating film.
Next, prebaking was performed under the conditions of heating temperature: 110 ° C. and heating time: 120 seconds.

Thereafter, radiation is applied through a photomask, post-exposure baking (PEB) is performed, and subsequently, atmospheric pressure in which a gas in which CF ₄ and He gas are mixed at a volume ratio of 1: 9 is introduced. With a plasma polymerization apparatus, the output is 800 W, the distance from the plasma generator to the table: 0.5 mm, the processing table speed: 10 m / s, only on the surface of the coating film that has been pre-baked and post-exposure baked. Fluorine doped. Thereafter, development processing using an alkali developer was performed, and further, post-baking processing was performed to form partition walls. PEB was performed under the conditions of heating temperature: 110 ° C., heating time: 120 seconds, and radiation irradiation intensity: 150 mJ / cm ² . The development process was performed by, for example, a vibration dipping method. The development processing time was 60 seconds. The post-bake treatment was performed under the conditions of heating temperature: 150 ° C. and heating time: 5 minutes. The formed partition wall had a thickness of 1.6 μm.

  Next, using a droplet discharge device as shown in FIGS. 3 to 6, color filter ink was discharged into a cell as a region surrounded by a partition wall. At this time, three color filter inks were used so that the color filter inks of the respective colors were not mixed. In each cell, a color filter ink was applied in such an amount that the average thickness of the colored portions to be formed was 1.6 μm. As a droplet discharge device, a tube (liquid feeding tube) and a droplet discharge means (droplet discharge head) are connected by a connecting member made of butyl rubber (manufactured by JSR, JSR butyl), and the inside of the droplet discharge head The ink supply unit and the head drive unit were connected with a fluorosilicone rubber (Fluorsilicone 614002, manufactured by ERIKS) as a connection material.

Thereafter, heat treatment was performed on a hot plate at 80 ° C. for 20 minutes (first heat treatment).
Further, by performing heat treatment in an oven at 230 ° C. for 60 minutes (second heat treatment), colored portions of three colors (red (R), green (G), and blue (B)) were formed. Thereafter, washing with N-methyl-2-pyrrolidone and γ-butyrolactone was performed, and a color filter as shown in FIG. 1 was obtained.
Using the method as described above, the color filter ink of each example and each comparative example (the color filter ink immediately after manufacture and the color filter ink left in a heating environment) was used, respectively, 6000. A sheet of color filter was manufactured.

[6] Evaluation of color filter The following evaluation was performed using each color filter obtained as described above.
[6.1] Flatness of colored portion Each of the color filters manufactured using the color filter ink (color filter ink set) of each of the examples and the comparative examples was manufactured on the 1000th sheet. A color filter was prepared.

About these color filters, the difference (DELTA) D of the maximum height of a coloring part and minimum height was calculated | required using the stylus-type roughness meter (the Tencor company make, P-15), and it evaluated according to the following three steps | paragraphs of criteria. .
A: ΔD is less than 0.15 μm.
B: ΔD is 0.15 μm or more and less than 0.40 μm.
C: ΔD is 0.40 μm or more.

[6.2] Evaluation of contrast ratio Among the color filters manufactured using the color filter inks (color filter ink sets) of the respective Examples and Comparative Examples, each color was manufactured on the 6000th sheet. Using the filter, a liquid crystal display device as shown in FIG. 7 was manufactured under the same conditions.
When these liquid crystal display devices are used, a red single color display, a green single color display, and a blue single color display are performed, and a single color display is not performed using a contrast tester (CT-1 manufactured by Aisaka Electric Co., Ltd.). The contrast ratio (CR) in comparison with was calculated and evaluated as follows.

In the case of red single color display, evaluation was performed according to the following four-stage criteria.
A: CR is 2900 or more.
B: CR is 2200 or more and less than 2900.
C: CR is 1900 or more and less than 2200.
D: CR is less than 1900.

In the case of green single color display, evaluation was performed according to the following four-stage criteria.
A: CR is 3800 or more.
B: CR is 3300 or more and less than 3800.
C: CR is 3000 or more and less than 3300.
D: CR is less than 3000.

In the case of blue single color display, evaluation was performed according to the following four-stage criteria.
A: CR is 3100 or more.
B: CR is 2700 or more and less than 3100.
C: CR is 2400 or more and less than 2700.
D: CR is less than 2400.

[6.3] Color unevenness and density unevenness About the liquid crystal display devices of the above examples and comparative examples manufactured in [6.2], in a dark room, red single color display, green single color display, blue single color display, Visual observation was performed in a state where white monochromatic display was performed, and the occurrence of color unevenness and density unevenness at each part was evaluated according to the following five-stage criteria.

A: Color unevenness and density unevenness are not recognized at all.
B: Color unevenness and density unevenness are hardly recognized.
C: Color unevenness and density unevenness are slightly recognized.
D: Color unevenness and density unevenness are clearly recognized.
E: Color unevenness and density unevenness are noticeable.

[6.4] Characteristic difference among individuals Among the color filters manufactured using the color filter inks (color filter ink sets) of the respective examples and comparative examples, the first to 20th sheets, In addition, a color filter manufactured on the 5980th to 5999th sheets is prepared, and in a dark room, a red single color display, a green single color display, a blue single color display, and a white single color display are performed. A spectrophotometer (manufactured by Otsuka Electronics Co., Ltd.) , MCPD3000). From the results, for each example and each comparative example, the color difference (in the Lab display system) that is the largest among the color filters manufactured in the 1st to 20th sheets and the 5980 to 5990th sheets (total 40 color filters), respectively. The color difference ΔE) was determined and evaluated according to the following five-step criteria.

A: Color difference (ΔE) is less than 1.5.
B: Color difference (ΔE) is 1.5 or more and less than 2.5.
C: Color difference (ΔE) is 2.5 or more and less than 3.5.
D: Color difference (ΔE) is 3.5 or more and less than 4.5.
E: Color difference (ΔE) is 4.5 or more.

[6.5] Heat cycle test Of the color filters manufactured using the color filter inks (color filter ink sets) of the respective Examples and Comparative Examples, the heat cycle tests were manufactured for 5921 to 5930 sheets, respectively. A liquid crystal display device as shown in FIG. 7 was manufactured under the same conditions using a color filter.

Using these liquid crystal display devices, light leakage (white spots, bright spots) occurs when visual observation is performed in a dark room with red single color display, green single color display, and blue single color display. Confirmed that there is no.
Next, the color filter was removed from the liquid crystal display device.
Each removed color filter is placed in a 20 ° C environment for 1.5 hours, then in a 60 ° C environment for 2.5 hours, then in a 20 ° C environment for 1.5 hours, and then at -10 ° C. It was left in the environment for 2.5 hours. Thereafter, the ambient temperature was returned again to 20 ° C., which was set to one cycle (8 hours), and this cycle was repeated 30 times in total (total 240 hours).

Thereafter, using these color filters, a liquid crystal display device as shown in FIG. 7 was assembled again.
Using these liquid crystal display devices, visual observation is performed in a dark room with red single color display, green single color display, and blue single color display, and the occurrence of light leakage (white spots, bright spots) is observed. The evaluation was made according to the following five-stage criteria.

A: There is no color filter in which light leakage (white spots, bright spots) occurs.
B: Light leakage (white spots, bright spots) is observed in one or two color filters.
C: Light leakage (white spots, bright spots) is observed in 3 to 5 color filters.
D: Light leakage (white spots, bright spots) is observed in 6 to 9 color filters.
E: Light leakage (white spots, bright spots) is observed in 10 color filters.

[7] Evaluation of heat resistance Each color filter ink of each of the above Examples and Comparative Examples was applied onto a 0.7 mm thick glass substrate by spin coating. The amount of ink applied was set so that the dry film thickness was 1.6 μm.
Next, these test pieces were heated at 220 ° C. for 1 hour in a clean oven.

Next, the color of the test piece subjected to the heat treatment at 220 ° C. was measured using a spectrophotometer (manufactured by Otsuka Electronics Co., Ltd., MCPD3000).
Thereafter, these test pieces were further heated at 250 ° C. for 1 hour in a clean oven.
Here, the color of the test piece subjected to the heat treatment at 250 ° C. was measured using a spectrophotometer (MCPD3000, manufactured by Otsuka Electronics Co., Ltd.).

From these results, the color difference (color difference ΔE in the Lab display system) before and after the heat treatment (heat treatment at 250 ° C.) was determined for each test piece, and evaluated according to the following three criteria.
○: Color difference (ΔE) is less than 1.2.
Δ: Color difference (ΔE) is 1.2 or more and less than 3.2.
X: Color difference (ΔE) is 3.2 or more.

[8] Evaluation of Colored Film Formed Using Color Filter Ink Using the color filter inks of the respective Examples and Comparative Examples, a number of test pieces used for the following tests ( Test plate).
First, each ink was applied onto a glass substrate having a thickness of 0.7 mm by spin coating. The amount of ink applied was set so that the dry film thickness was 1.6 μm.
Next, pre-baking was performed on a 90 ° C. hot plate for 10 minutes. Then, it post-baked by heating at 200 ° C. for 20 minutes in a clean oven, and further post-baked by heating at 240 ° C. for 30 minutes to obtain a test piece (test plate) having a colored film.

[8.1] Evaluation of solvent resistance The test pieces of the respective colors of the respective Examples and Comparative Examples were measured using a spectrophotometer (manufactured by Otsuka Electronics Co., Ltd., MCPD3000).
Next, these test pieces were immersed in a solvent at 50 ° C. for 20 minutes, and then colorimetry was similarly performed using a spectrophotometer (manufactured by Otsuka Electronics Co., Ltd., MCPD3000).
From these results, the color difference before and after immersion of the solvent (color difference ΔE in the Lab display system) was determined for each test piece and evaluated according to the following two-stage criteria.
○: Color difference (ΔE) is less than 3.2.
X: Color difference (ΔE) is 3.2 or more.
As the solvent, γ-butyrolactone (γ-BL), isopropyl alcohol (IPA), N-methyl-2-pyrrolidone (NMP), 0.5N hydrochloric acid (HCl), 0.5N aqueous sodium hydroxide solution (NaOH) are used. It was.

[8.2] Light resistance evaluation The test pieces of the respective colors of the respective Examples and Comparative Examples were measured using a spectrophotometer (MCPD3000, manufactured by Otsuka Electronics Co., Ltd.).
Next, in an environment of 40 ° C. and 60% RH, these test pieces were irradiated with light using a xenon fade meter, and then a spectrophotometer (manufactured by Otsuka Electronics Co., Ltd., MCPD3000) was used similarly. And measured the color. Irradiation conditions were 320 W / m ² × 200 hours. The black panel temperature at this time was 50 degreeC.
From these results, the color difference before and after light irradiation (color difference ΔE in the Lab display system) was determined for each test piece and evaluated according to the following three-stage criteria.
○: Color difference (ΔE) is less than 1.2.
Δ: Color difference (ΔE) is 1.2 or more and less than 3.2.
X: Color difference (ΔE) is 3.2 or more.

[8.3] Evaluation of Adhesiveness to Substrate First, eleven vertical and horizontal cuts perpendicular to each other were made at 1 mm intervals on the colored films of the test pieces of the respective colors of the respective Examples and Comparative Examples. Furthermore, the cellophane tape was lightly adhered to the pattern with a finger and the tape was quickly peeled off. The state of the scratch was observed, and evaluation was performed according to the following five-step criteria.

A: There is slight peeling at the intersecting line of the cuts, and the area of the defect is less than 8% of the total square area.
B: There is peeling at the intersection of the cuts, and the area of the missing part is 8% or more and less than 18% of the total square area.
C: The width of peeling due to the cut is wide, and the area of the defect is 18% or more and less than 38% of the total square area.
D: The width of the peeling due to the cut is wider than 4 points, and the area of the defect is 38% or more and less than 68% of the total square area
E: The area of peeling is 68% or more of the total square area.

[8.4] Evaluation of Adhesiveness of ITO Film First, the test pieces of the respective colors of the respective examples and comparative examples were immersed in isopropyl alcohol for 5 minutes, and then dried and washed with isopropyl alcohol vapor.
Thereafter, an ITO (indium tin oxide) film was formed to a thickness of 120 nm under a vacuum of 6 × 10 ⁻³ Torr at a substrate set temperature of 200 ° C.
After the heat resistance test at 180 ° C. for 50 minutes, the surface roughness (Ra) of the ITO film was measured by AFM and evaluated according to the following three-stage criteria. As the AFM, NanoScope IIIa manufactured by Nippon Bico Co., Ltd. was used.

A: No abnormality such as wrinkles or cracks was observed in the ITO film.
Δ: Several abnormalities such as wrinkles and cracks were observed in the ITO film.
X: Abnormalities such as wrinkles and cracks were observed on the entire surface of the ITO film.
These results are shown in Tables 6-11. In the table, the color filter ink immediately after production is indicated as “before heating”, and the color filter ink left in an environment of 55 ° C. for 8 days (color filter ink left in a heating environment) is “after heating”. "

As is apparent from the table, the present invention is excellent in the stability of droplet discharge, and the produced color filter suppresses the occurrence of color unevenness, density unevenness, etc., and variation in characteristics among individuals. Was also small. In the present invention, the durability of the color filter was also excellent. In the present invention, the contrast was also excellent. Further, in the present invention, the color filter ink has excellent temporal stability, and the color filter ink can be suitably discharged even after the color filter ink is left under heating conditions. Could be manufactured stably. In the present invention, the formed colored portion has sufficient hardness. In the present invention, the colored film (colored portion) formed using the color filter ink is excellent in solvent resistance, heat resistance, light resistance, adhesion to the substrate, and adhesion of the ITO film. confirmed.
On the other hand, in each comparative example, a satisfactory result was not obtained.
Further, when a commercially available liquid crystal television was disassembled and the liquid crystal display device part was replaced with one manufactured as described above, and the same evaluation as described above was performed, the same result as above was obtained.

It is sectional drawing which shows suitable embodiment of the color filter of this invention. It is sectional drawing which shows the manufacturing method of a color filter. It is a perspective view which shows the droplet discharge apparatus used for manufacture of a color filter. It is the figure which observed the droplet discharge means in the droplet discharge apparatus shown in FIG. 3 from the stage side. It is a figure which shows the bottom face of the droplet discharge head in the droplet discharge apparatus shown in FIG. It is a figure which shows the droplet discharge head in the droplet discharge apparatus shown in FIG. 3, (a) is a cross-sectional perspective view, (b) is sectional drawing. It is sectional drawing which shows embodiment of a liquid crystal display device. 1 is a perspective view showing a configuration of a mobile (or notebook) personal computer to which an electronic apparatus of the present invention is applied. It is a perspective view which shows the structure of the mobile telephone (PHS is also included) to which the electronic device of this invention is applied. It is a perspective view which shows the structure of the digital still camera to which the electronic device of this invention is applied.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Color filter 11 ... Board | substrate 12 ... Colored part 12A ... 1st colored part 12B ... 2nd colored part 12C ... 3rd colored part 13 ... Partition 14 ... Cell 2 ... Color filter ink 3 ... Coating film 60 ... Liquid crystal display device 61 ... Common electrode 62 ... Liquid crystal layer 63, 64 ... Alignment film 65 ... Pixel electrode 66 ... Substrate (counter substrate) 67, 68 ... Polarizing plate 100 ... Droplet discharge device 101 ... Tank 102 ... Discharge scanning unit 103 ... Droplet discharge means 104 ... first position control device 105 ... carriage 106 ... stage 108 ... second position control device 110 ... tube (liquid feeding tube) 112 ... control means 114 ... droplet discharge head (inkjet head) 116A, 116B ... Nozzle array 118 ... Nozzle 120 ... Cavity 122 ... Bulkhead 124 ... Vibrator 124A, 12 B ... Electrode 124C ... Piezo element 126 ... Diaphragm 127 ... Discharge unit 128 ... Nozzle plate 129 ... Liquid pool 130 ... Supply port 131 ... Hole 1000 ... Image display device 1100 ... Personal computer 1102 ... Keyboard 1104 ... Main body 1106 ... Display unit DESCRIPTION OF SYMBOLS 1200 ... Mobile telephone 1202 ... Operation button 1204 ... Earpiece 1206 ... Mouthpiece 1300 ... Digital still camera 1302 ... Case (body) 1304 ... Light receiving unit 1306 ... Shutter button 1308 ... Circuit board 1312 ... Video signal output terminal 1314 ... Data communication Input / output terminal 1430 ... TV monitor 1440 ... personal computer

Claims (15)

A color filter ink used in the production of an ink jet color filter,
A colorant, a liquid medium in which the colorant is dissolved and / or dispersed, and a resin material,
In the sealed liquid medium, the swelling rate of the butyl rubber when the butyl rubber is allowed to stand in an environment of 40 ° C. under atmospheric pressure for 15 days is 35% or less,
The liquid medium includes those having an alkoxyl group or an acetyl group at both ends of the molecular chain, and further having at least one ether oxygen atom in the molecule,
The resin material is a monomer component w1 represented by the following formula (1), a monomer component w2 represented by the following formula (2), and a monomer component w3 represented by the following formula (3): A color filter ink comprising a polymer W containing a monomer component w4 represented by the following formula (4).

The content of the monomer component w1 in the total components constituting the polymer W is 25 to 75 wt%,
The content of the monomer component w2 in the total components constituting the polymer W is 2 to 25 wt%,
The content rate of the monomer component w3 in the total components constituting the polymer W is 5 to 50 wt%,
2. The color filter ink according to claim 1, wherein the content of the monomer component w <b> 4 in all components constituting the polymer W is 3 to 40 wt%. In addition to the polymer W, the resin material further includes at least a monomer component x1 represented by the following formula (5), a monomer component x2 represented by the following formula (6), and the following formula (7). The color filter ink according to claim 1, comprising a polymer X comprising a monomer component x3 represented by formula (8) and a monomer component x4 represented by the following formula (8):

In addition to the polymer W, the resin material further includes at least a monomer component y1 represented by the following formula (9) and a monomer component y2 represented by the following formula (10). The color filter ink according to claim 1, comprising:

In addition to the polymer W, the resin material further includes at least a monomer component z1 represented by the following formula (11), a monomer component z2 represented by the following formula (12), and the following formula (13). The color filter ink according to any one of claims 1 to 4, comprising a polymer Z containing a monomer component z3 represented by formula (1).

The color filter ink contains a pigment as the colorant,
6. The color filter ink according to claim 1, further comprising an acid value dispersant having a predetermined acid value and an amine value dispersant having a predetermined amine value as a dispersant. A pigment as the colorant,
The pigment is C.I. I. The color filter ink according to any one of claims 1 to 6, which contains Pigment Green 58 and a sulfonated pigment derivative as an auxiliary pigment.   8. The liquid medium according to claim 1, wherein the liquid medium has at least two ether oxygen atoms in the molecule in addition to the alkoxyl group or acetyl group provided at both ends of the molecular chain. Color filter ink.   9. The color filter ink according to claim 1, wherein the liquid medium has a linear molecular structure having no side chain.   The color filter ink is used in a droplet discharge device in which a connecting member that connects a liquid supply tube for supplying the color filter ink and an inkjet head for discharging droplets is made of the butyl rubber. The ink for a color filter according to any one of claims 1 to 9.   The swelling rate of the fluorosilicone rubber is 10% or less when the fluorosilicone rubber is allowed to stand in the sealed liquid medium for 15 days at 40 ° C under atmospheric pressure. The color filter ink according to any one of the above.   A color filter manufactured using the color filter ink according to claim 1.   An image display device comprising the color filter according to claim 12.   The image display device according to claim 13, wherein the image display device is a liquid crystal panel.   An electronic apparatus comprising the image display device according to claim 13.

Images