JP2009271229A - Color filter, image display device and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color filter manufactured by using an inkjet method and excellent in lightness and a contrast ratio, and to provide an image display device and electronic equipment having the color filter. <P>SOLUTION: The color filter has a plurality of colored portions on a substrate, the colored portions provided by a droplet discharge method using a color filter ink comprising a colorant and a liquid medium. The color filter is characterized in that, when an effective area is defined in a plan view of the color filter, the area in a similar figure to the colored portion with a homothetic ratio of 0.90 to the colored portion and having the gravity center at the same point as that of the colored portion, the colored portion satisfies a relationship of an expression (I). The expression (I) is 0.80≤T<SB>min</SB>/T<SB>max</SB>≤1.00, wherein T<SB>min</SB>[μm] represents the minimum thickness in the effective area and T<SB>max</SB>[μm] represents the maximum thickness in the effective area. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

A color filter is generally used for 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 (colored 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 manufacture of the color filter remains as a colored layer in the finally obtained color filter, and most of it is removed in the manufacturing 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 of forming a colored layer (colored portion) of a color filter using an inkjet head (droplet discharge head) has been proposed (see, for example, 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.
By the way, the color filter manufacturing method using the ink jet method is excellent in productivity as described above, but the color filter manufactured using the ink jet head is the same as the color filter manufactured by the photolithography method. In comparison, there was a problem that the brightness and contrast ratio were inferior.

JP 2004-2815 A

  An object of the present invention is to provide a color filter excellent in brightness and contrast ratio manufactured using an ink jet method, and to provide an image display device and an electronic apparatus provided with the color filter.

Such an object is achieved by the present invention described below.
In the color filter of the present invention, a plurality of colored portions are provided on a substrate by a droplet discharge method using a color filter ink comprising a colorant and a liquid medium in which the colorant is dissolved or dispersed. Color filter,
When the color filter is viewed in plan, the effective area of the colored part is similar to the colored part, the similarity ratio to the colored part is 0.90, and the center of gravity is at the same point as the colored part Then, a colored portion satisfying the relationship of the following formula (I) is provided.
0.80 ≦ T _min / T _max ≦ 1.00 (I)
(However, T _min [μm] is the minimum value of the thickness in the effective region, and T _max [μm] is the maximum value of the thickness in the effective region.)
Thereby, the color filter excellent in the brightness and contrast ratio manufactured using the inkjet method can be provided.

In the color filter of the present invention, when the color filter is viewed in plan, each of the plurality of colored portions has a rectangular shape,
When an arbitrary cross section A perpendicular to the substrate in the short side direction of the rectangle is observed, it is preferable that a colored portion satisfying the relationship of the following formula (II) is provided.
0.85 ≦ TA _min / TA _max ≦ 1.00 (II)
(However, TA _min [μm] is the minimum value of the thickness of the colored portion in the effective area of the cross section A, and TA _max [μm] is in the effective area of the cross section A. And the maximum thickness of the colored portion.)
Thereby, the brightness and contrast ratio of the color filter are particularly excellent.

In the color filter of the present invention, when the color filter is viewed in plan, each of the plurality of colored portions has a rectangular shape,
When observing an arbitrary cross section B perpendicular to the substrate in the long side direction of the rectangle, it is preferable that a colored portion satisfying the relationship of the following formula (III) is provided.
0.90 ≦ TB _min / TB _max ≦ 1.00 (III)
(However, TB _min [μm] is the minimum value of the thickness of the colored portion in the effective area of the cross section B, and TB _max [μm] is in the effective area of the cross section B. And the maximum thickness of the colored portion.)
Thereby, the brightness and contrast ratio of the color filter are particularly excellent.

In the color filter of the present invention, the average thickness of the colored portion is preferably 1.0 to 2.5 μm.
When the average thickness of the colored portion is in such a range, the relationship of the above-described formula can be easily satisfied, and the light transmittance of the colored portion is particularly excellent.
In the color filter of the present invention, the plurality of colored portions are composed of colored portions of a plurality of colors, and include at least a green colored portion,
It is preferable that the green colored portion satisfying the formula (I) is provided.
Generally, the green colored portion formed by the ink jet method has a lightness and a contrast ratio that are likely to be low, but when the green colored portion satisfies such a relationship, the green colored portion is Excellent brightness and contrast ratio.

In the color filter of the present invention, the color filter ink includes a resin material,
The resin material preferably includes a polymer A containing at least an epoxy group-containing vinyl monomer a1 as a monomer component.
Thereby, the coloring part can satisfy the relationship of the above-mentioned formula easily.
In the color filter of the present invention, the polymer A contains, as a monomer component, a vinyl monomer having an isocyanate group or a blocked isocyanate group protected by a protective group in addition to the epoxy group-containing vinyl monomer a1. A copolymer containing the monomer a2 is preferred.
Thereby, bursting of bubbles in the color filter ink at the time of forming the colored portion can be prevented, the colored portion becomes particularly flat, and the relationship of the above formula can be more easily satisfied.

これにより、基板上に吐出されたインクは、好適に基板上に濡れ広がることができ、結果として得られる着色部の厚みを特に均一なものとすることができる。すなわち、着色部をより平坦にすることができより容易に前記式の関係を満足することができる。 In the color filter of the present invention, the color filter ink includes a resin material,
The resin material preferably includes a polymer B containing at least an alkoxysilyl group-containing vinyl monomer represented by the following formula (1) as a monomer component.

Thereby, the ink discharged on the substrate can be suitably spread on the substrate, and the thickness of the resulting colored portion can be made particularly uniform. That is, the colored portion can be made flatter and the relationship of the above equation can be satisfied more easily.

In the color filter according to the aspect of the invention, it is preferable that the color filter ink includes a flattening agent that flattens the formed colored portion when the colored portion is formed.
Thereby, the bursting of bubbles in the color filter ink at the time of forming the colored portion can be prevented, and the colored portion can be made particularly flat.
In the color filter of the present invention, it is preferable that the leveling agent contains a polyhydric alcohol.
The polyhydric alcohol has a function of flattening the colored portion by reducing the thixotropic property of the color filter ink at the time of forming the colored portion, and the colored portion becomes particularly flat and easier. The relationship of the above-described formula can be satisfied.

In the color filter of the present invention, the polyhydric alcohol is preferably an oligomer of glycols.
Thereby, a coloring part becomes especially flat and can satisfy | fill the relationship of the type | formula mentioned above more easily and reliably.
In the color filter of the present invention, the polyhydric alcohol is a liquid in an atmosphere of 25 ° C. and 1 atm,
The polyhydric alcohol preferably has a viscosity at 25 ° C. of 40 to 400 mPa · s.
Thereby, a coloring part becomes especially flat and can satisfy | fill the relationship of the type | formula mentioned above more easily and reliably.

An image display device according to the present invention includes the color filter according to the present invention.
Thereby, the image display apparatus provided with the color filter excellent in the brightness and contrast ratio in the display part can be provided.
The image display device of the present invention is preferably a liquid crystal panel.
Thereby, the image display apparatus provided with the color filter excellent in the brightness and contrast ratio in the display part can be provided.
An electronic apparatus according to the present invention includes the image display device according to the present invention.
Thereby, an electronic apparatus provided with a color filter having excellent brightness and contrast ratio can be provided on the display unit.

Hereinafter, preferred embodiments of the present invention will be described.
"Color filter"
First, an example of the color filter of the present invention will be described.
FIG. 1 is a plan view showing a preferred embodiment of the color filter of the present invention, FIG. 2 is a cross-sectional view in the short side direction of the colored portion of the color filter shown in FIG. 1, and FIG. It is the top view (a) of the part which expanded a part, sectional drawing (b) of the short side direction, and sectional drawing (c) of the long side direction of this enlarged part. Note that the drawings referred to in this specification show part of the configuration in an emphasized or simplified manner for convenience of explanation, and do not accurately reflect actual dimensions and the like.
As shown in FIGS. 1 and 2, the color filter 1 includes a substrate 11 and a plurality of coloring portions 12 having a rectangular shape in plan view. 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 optical transparency, 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>
As shown in FIG. 1, the colored portion 12 has a rectangular shape in plan view.
Each colored 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 have 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). Then, one pixel 15 (enclosed by a broken line in the figure) is composed of a pair of the first coloring portion 12A, the second coloring portion 12B, and the third coloring portion 12C arranged in the short side direction of the coloring portion 12. Constitutes one pixel 15).

  As shown in FIG. 1, the color filter 1 includes a row in which a plurality of pixels 15 are arranged in the short side direction of the coloring portion 12 and a column in which the plurality of pixels 15 are arranged in the long side direction of the coloring portion 12. It is configured. For example, when the color filter 1 is a high-definition color filter, 1366 × 768 pixels 15 are arranged, and when the color filter 1 is a full high-definition color filter, 1920 × 1080 pixels 15 are arranged. In the case of a super high vision color filter, 7680 × 4320 pixels 15 are arranged. For example, the color filter 1 may include a spare pixel 15 outside the effective area.

By the way, although the manufacturing method of the color filter using the inkjet method is excellent in productivity, the color filter manufactured using the inkjet head is generally compared with the color filter manufactured by the photolithography method. The brightness and contrast ratio are inferior.
Thus, as a result of intensive studies, the present inventors have focused on the shape of the colored portion and satisfied the predetermined relationship with respect to the thickness of the colored portion, so that the brightness of the color filter manufactured using the inkjet head and It has been found that the contrast ratio can be made excellent.

This will be described in detail below. Attention is paid to the colored portion 12 surrounded by the point OPQR of the color filter 1 shown in FIG. Further, a region having a similar shape to the region OPQR of the colored portion 12, a similarity ratio to the region OPQR of 0.90, and a center of gravity at the same point as the colored portion 12 is defined as a region O′P′Q′R ′. And In the present invention, when the region O′P′Q′R ′ is the effective region 16, the color filter 1 as the colored portion 12 satisfies the relationship of the following formula (I) in the effective region 16. Is provided.
0.80 ≦ T _min / T _max ≦ 1.0 (I)
(However, T _min [μm] is the minimum value of the thickness in the effective region 16, and T _max [μm] is the maximum value of the thickness in the effective region 16.)

As described above, the ratio between the maximum value T _max [μm] of the colored portion 12 in the effective region 16 and the minimum value T _min [μm] of the colored portion 12 is sufficiently small. The colored portion 12 has less unevenness and is flat. If the colored portion 12 is flat, the light transmitted through the colored portion 12 is less likely to be unintentionally scattered, and as a result, the amount of light transmitted through the colored portion 12 increases. From the above, it is considered that the color filter 1 provided with such a colored portion 12 has excellent brightness and contrast ratio.

On the other hand, when T _min / T _max is less than the lower limit, the colored portion 12 has a lot of unevenness and does not become flat. For this reason, the amount of light transmitted through the colored portion 12 is small, and the brightness and contrast ratio of the color filter 1 are not excellent.
In addition, regarding the amount of light transmitted through the colored portion 12, the behavior of light transmitted through the effective region 16 near the center of the colored portion 12 is considered to be important. Attention was paid to the relationship between the thicknesses of the colored portions 12 in the effective region 16. The outside of the effective area 16 of the colored portion 12 is generally easily shaded by the partition wall 13. Further, the partition wall 13 may be formed to be inclined, and in this case, the outside of the effective region 16 of the colored portion 12 has a portion that does not have light transmittance.

Further, the straight line or curve on the outer periphery of the effective region 16 is arranged so as to be parallel to the corresponding straight line or curve on the outer periphery of the similar colored portion 12. In other words, the effective region 16 is similar to the colored portion 12 but is not rotated from the colored portion 12.
Moreover, it is preferable that the color filter 1 is provided with the green coloring part 12B which satisfies Formula (I). In general, a green colored portion formed by an inkjet method tends to have a lower brightness and contrast ratio than a green colored portion formed by a photolithography method. However, by providing a green colored portion 12B that satisfies the formula (I), the colored portion 12B has excellent brightness and contrast ratio, and when the color filter 1 performs green display. The brightness and contrast ratio are excellent.

The colored portion 12 that satisfies the formula (I) is preferably 60% or more, more preferably 70% or more, and more preferably 80% or more of all the colored portions 12 in the color filter 1. More preferably. As a result, the color filter 1 has particularly excellent brightness and contrast ratio.
In addition, regarding the color filter 1, when a plurality (for example, 100) of arbitrary colored portions 12 of the same color are randomly selected, the average value of T _min / T _max of the colored portions 12 is 0.80 to 1 It is preferably 0.000, more preferably 0.82 to 1.00, still more preferably 0.85 to 1.00, and the above-described effects can be obtained more remarkably.

3B shows an arbitrary cross section A perpendicular to the substrate 11 in the short side direction of the colored portion 12 of FIG. 3A. The cross section A is a cross section perpendicular to the substrate 11 on a straight line in a direction parallel to the short side connecting the points A and A ′ in FIG.
When the cross section A is observed, the color filter 1 is preferably provided with a colored portion 12 that satisfies the relationship of the following formula (II).
0.85 ≦ TA _min / TA _max ≦ 1.00 (II)
(However, TA _min [μm] is the minimum value of the thickness of the colored portion 12 in the effective area 16 of the cross section A, and TA _max [μm] is in the effective area 16 of the cross section A. (This is the maximum thickness of the colored portion 12.)

As a result, the light transmitted through the colored portion 12 is effectively prevented from being unintentionally scattered. As a result, the amount of light transmitted through the colored portion 12 is further increased, and the color filter 1 is improved in brightness and contrast ratio. Especially excellent.
In particular, when the colored portion 12 satisfies the formula (I) and the formula (II) at the same time, the colored portion 12 is particularly excellent in light transmission, and the color filter 1 has a lightness and a contrast ratio. Especially excellent.

The colored portion 12 that satisfies the formula (II) is preferably 60% or more, more preferably 70% or more, and more preferably 80% or more of all the colored portions 12 in the color filter 1. More preferably. As a result, the color filter 1 has particularly excellent brightness and contrast ratio.
Moreover, it is preferable that the coloring part 12 which satisfy | fills said Formula (I) and said Formula (II) simultaneously is 55% or more among all the coloring parts 12 in the color filter 1, and is 60% or more. Is more preferable, and 70% or more is more preferable. As a result, the color filter 1 has particularly excellent brightness and contrast ratio.

In addition, regarding the color filter 1, when a plurality of (for example, 100) arbitrary colored portions 12 of the same color are randomly selected, the average value of TA _min / TA _max of the colored portions 12 is 0.85 to 1. It is preferably 0.000, more preferably 0.88 to 1.00, still more preferably 0.90 to 1.00, and the effects as described above can be obtained more remarkably.

3C shows an arbitrary cross section B perpendicular to the substrate 11 in the long side direction of the colored portion 12 in FIG. 3A. The cross section V is a cross section perpendicular to the substrate 11 on a straight line in a direction parallel to the short side connecting the points B and B ′ in FIG.
When observing such a cross section B, the color filter 1 is preferably provided with a colored portion 12 that satisfies the relationship of the following formula (III).
0.90 ≦ TB _min / TB _max ≦ 1.00 (III)
(However, TB _min [μm] is the minimum value of the thickness of the colored portion 12 in the effective area 16 of the cross section B, and TB _max [μm] is in the effective area 16 of the cross section B. And the maximum thickness of the colored portion 12.)

As a result, the light transmitted through the colored portion 12 is effectively prevented from being unintentionally scattered. As a result, the amount of light transmitted through the colored portion 12 is further increased, and the color filter 1 is improved in brightness and contrast ratio. Especially excellent.
In particular, when the colored portion 12 satisfies the formula (I) and the formula (III) at the same time, the colored portion 12 is particularly excellent in light transmission, and the color filter 1 has a brightness and contrast ratio. Especially excellent.

Further, the colored portion 12 satisfying the formula (III) is preferably 60% or more, more preferably 70% or more, and more preferably 80% or more of all the colored portions 12 in the color filter 1. More preferably. As a result, the color filter 1 has particularly excellent brightness and contrast ratio.
Moreover, it is preferable that the coloring part 12 which satisfy | fills said Formula (I) and said Formula (III) simultaneously is 55% or more of all the coloring parts 12 in the color filter 1, and is 60% or more. Is more preferable, and 70% or more is more preferable. As a result, the color filter 1 has particularly excellent brightness and contrast ratio.

In addition, regarding the color filter 1, when a plurality of (for example, 100) arbitrary colored portions 12 of the same color are randomly selected, the average value of TB _min / TB _max of the colored portions 12 is 0.90 to 1 Is preferably 0.0, more preferably 0.93 to 1.0, and the effects as described above can be obtained more remarkably.
Moreover, it is preferable that it is 1.0-2.5 micrometers, and, as for the average thickness of the coloring part 12, it is more preferable that it is 1.5-2.0 micrometers. When the average thickness of the colored portion 12 is in such a range, the relationship of the above-described formula can be easily satisfied, and the light transmittance of the colored portion 12 is particularly excellent.

<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 more 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 curable resin material. Thereby, the partition wall 13 can be easily formed to have a desired shape by a method 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.
In addition, the color filter as described above may be manufactured by an ink jet method, and may be manufactured by any color filter ink and manufacturing method. According to the manufacturing method, it can manufacture easily and reliably.

《Color filter ink》
Next, the color filter ink capable of suitably forming the colored portion as described above will be described in detail.
The color filter ink of the present embodiment is an ink used for manufacturing a color filter (forming a colored portion of a color filter), and particularly used for manufacturing a color filter by an inkjet method.
The color filter ink (hereinafter also simply referred to as ink) includes a colorant and a liquid medium in which the colorant is dispersed or dissolved.

Hereinafter, the constituent materials of the color filter ink suitably used in the present invention will be described in detail.
<Colorant>
A 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, 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 a pigment containing a pigment as a colorant (pigment ink), the color filter to be manufactured has superior light resistance and the like compared to a pigment containing a dye as a colorant (dye ink). be able to.
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 effect of using in combination with a dispersant and a curable resin material (curable resin composition), which will be described in detail later, is more prominent, and the dispersion stability of the pigment particles in the color filter ink is excellent. Can be. As a result, it is possible to suppress an increase in thixotropic property of the color filter ink at the time of forming the colored portion, and at the time of applying the ink to the cell, the discharge stability of the color filter ink is particularly excellent. be able to.
C. I. Pigment Red 177 derivatives, C.I. I. When the compound of Pigment Red 254 contains a compound (derivative) represented by the following formula (2) or the following formula (3), the above-described effects are more remarkably exhibited.

  In particular, the color filter ink is used as a pigment (green pigment) as C.I. 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 brightness, conventionally, it has been an extremely difficult material to stably disperse. However, the present inventor I. It has been found that even when Pigment Green 58 is included, the dispersion stability in the color filter ink can be improved by simultaneously including a sulfonated pigment derivative as a sub-pigment. As a result, the color developability of the color filter ink can be further improved, and the increase in thixotropic property of the color filter ink due to the high concentration of the pigment when forming the colored portion can be suppressed. Can do. In addition, the long-term storage stability of the pigment in the color filter ink and the discharge 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 (4). Thereby, the dispersion stability of the pigment particles in the color filter ink can be made particularly excellent, and an image with a better contrast can be displayed on the manufactured color filter.

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-described 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 (4) 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 (4) 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 (4) 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. A pigment derivative (sulfonated pigment derivative) having an appropriate affinity for CI Pigment Green 58 (brominated phthalocyanine) is 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 above excellent effects.

  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 dispersion stability of the pigment particles in the color filter ink can be made excellent. Further, the contrast ratio and brightness of the manufactured color filter can be made particularly excellent.

  In particular, the color filter ink is used as a pigment (blue pigment). I. Pigment blue 15: 6 or C.I. I. When the pigment blue 15 derivative is included, the color developing property of the color filter ink (blue color filter ink) can be made particularly excellent. In addition, the dispersion stability of the pigment particles in 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; 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.

<Liquid medium>
The liquid medium (liquid medium) has a function of dispersing or dissolving the colorant in the color filter ink. In general, most of the liquid medium constituting the color filter ink is removed in the process of manufacturing the color filter. In addition, when the color filter ink includes a resin material (a curable resin material or a thermoplastic resin material) as described later, the liquid medium also functions as a solvent for dissolving them.

  As the liquid medium, for example, ester compounds, ether compounds, hydroxy ketones, carbonic acid diesters, cyclic amide compounds and the like can be used. Among them, [1] polyhydric alcohols (for example, ethylene glycol, propylene glycol, butylene glycol, Glycerin etc.) or alkyl ethers of polyhydric alcohol ethers (eg methyl ether, ethyl ether, butyl ether, hexyl ether etc.), esters (eg formate, acetate, propionate etc.), [2] polyvalent carboxylic acids (eg amber) Acid, glutaric acid, etc.) esters (for example, methyl esters, etc.), [3] ethers, esters, etc. of compounds having at least one hydroxyl group and at least one carboxyl group in the molecule (hydroxy acid), [4] many Valco Carbonic diester having a chemical structure as obtained by the reaction of Le and phosgene, is preferred. Examples of the compound that can be used as the liquid medium include 2- (2-methoxy-1-methylethoxy) -1-methylethyl acetate, triethylene glycol dimethyl ether, triethylene glycol diacetate, diethylene glycol monoethyl ether acetate, 4-methyl-1,3-dioxolan-2-one, bis (2-butoxyethyl) ether, dimethyl glutarate, ethylene glycol di-n-butylate, 1,3-butylene glycol diacetate, diethylene glycol monobutyl ether acetate, tetraethylene Glycol dimethyl ether, 1,6-diacetoxyhexane, tripropylene glycol monomethyl ether, butoxypropanol, diethylene glycol methyl ethyl ether, diethylene Glycol methyl butyl ether, triethylene glycol methyl ethyl ether, triethylene glycol methyl butyl ether, dipropylene glycol monomethyl ether acetate, diethylene glycol dimethyl ether, ethyl 3-ethoxypropionate, diethylene glycol ethyl methyl ether, 3-methoxybutyl acetate, diethylene glycol diethyl ether, octane Ethyl acid, ethylene glycol monobutyl ether acetate, ethylene glycol monobutyl ether, cyclohexyl acetate, diethyl succinate, ethylene glycol diacetate, propylene glycol diacetate, 4-hydroxy-4-methyl-2-pentanone, dimethyl succinate, 1-butoxy 2-propanol, diethylene Recall monoethyl ether, diethylene glycol monomethyl ether, dipropylene glycol monomethyl ether, 3-methoxy-n-butyl acetate, diacetin, dipropylene glycol mono n-propyl ether, polyethylene glycol monomethyl ether, butyl glycolate, ethylene glycol monohexyl ether, Dipropylene glycol mono n-butyl ether, N-methyl-2-pyrrolidone, triethylene glycol butyl methyl ether, bis (2-propoxyethyl) ether, diethylene glycol diacetate, diethylene glycol butyl methyl ether, diethylene glycol butyl ethyl ether, diethylene glycol butyl propyl ether , Diethylene glycol ethyl propyl ether Diethylene glycol methyl propyl ether, diethylene glycol propyl ether acetate, triethylene glycol methyl ether acetate, triethylene glycol ethyl ether acetate, triethylene glycol propyl ether acetate, triethylene glycol butyl ether acetate, triethylene glycol butyl ethyl ether, triethylene glycol ethyl Methyl ether, triethylene glycol ethyl propyl ether, triethylene glycol methyl propyl ether, dipropylene glycol methyl ether acetate, n-nonyl alcohol, diethylene glycol monobutyl ether, triethylene glycol monomethyl ether, ethylene glycol 2-ethylhexyl ether Examples include triethylene glycol monoethyl ether, diethylene glycol monohexyl ether, triethylene glycol monobutyl ether, diethylene glycol mono-2-ethylhexyl ether, tripropylene glycol mono n-butyl ether, butyl cellosolve acetate, and one or two selected from these A combination of more than one species can be used.

  Among these, liquid media include 1,3-butylene glycol diacetate, bis (2-butoxyethyl) ether, 2- (2-methoxy-1-methylethoxy) -1-methylethyl acetate, and diethylene glycol mono It preferably contains one or more selected from the group consisting of butyl ether acetate. Thereby, the discharge stability of the ink droplets for the color filter can be made particularly excellent, and color unevenness, density unevenness, etc. at each part of the manufactured color filter can be more effectively suppressed. In addition, the uniformity of characteristics among individuals can be made particularly excellent. Even when a relatively large amount of colorant, resin material, or the like is contained in the ink, the change in the physical properties of the ink is relatively small. Further, when a pigment is contained in the color filter ink, the long-term dispersion stability of the pigment can be made sufficiently excellent even when the pigment content is increased, and the colored portion is formed at the time of formation. An increase in thixotropic property of the color filter ink is suppressed. Further, when the liquid medium is composed of the above compound, the color filter ink can be surely wetted and spread throughout the cell in the color filter manufacturing method as described later. it can.

  Further, among the above, when the liquid medium contains diethylene glycol monobutyl ether acetate, the viscosity of the ink can be made particularly low, and the discharge stability of the ink droplets can be made particularly excellent. it can. Further, since the ink quickly wets and spreads to every corner on the substrate, the color reproducibility and depolarization (contrast ratio) can be made particularly excellent by making the thickness of the obtained color filter uniform. In addition, since diethylene glycol monobutyl ether acetate has a solubility parameter (SP value) close to a curable resin or a dispersant as described later, the dispersion stability of the ink is high, and the viscosity change is small over a long period of time. Moreover, deterioration and aggregation of components such as a colorant and a resin can be suitably prevented. Furthermore, when the liquid medium contains diethylene glycol monobutyl ether acetate, the solubility of water in the liquid medium can be made appropriate. For this reason, the liquid medium of ink can reliably prevent moisture absorption from the outside. Further, even when water is mixed in the ink flow path or the like of the droplet discharge device, the water can be suitably dissolved and removed. As a result, the water content in the ink can be made particularly low, and the ejection stability of the ink droplets from the droplet ejection head (for example, the uniformity of the ejection amount of the droplets) can be improved over a longer period. Can be particularly excellent. In addition, when the flattening agent described later has a glycol skeleton, particularly when it is an ethylene glycol oligomer, the flattening agent can sufficiently reduce the thixotropic property of the ink. This is presumably because the leveling agent and diethylene glycol monobutyl ether acetate both have a glycol skeleton and the leveling agent is more uniformly dissolved in the ink.

  In addition, among the above, when the liquid medium contains bis (2-butoxyethyl) ether or 1,3-butylene glycol diacetate, the ink becomes very difficult to dry in the vicinity of the nozzle, and the flight curve in the inkjet process. Is more effectively suppressed. In addition, in the flushing process that is performed to periodically discharge a small amount of ink to prevent nozzle clogging, it is possible to prevent ink drying near the nozzle during long-distance head movement, such as dummy pixels provided in the substrate The abandoned area is unnecessary. In addition, since the ink is difficult to dry, deterioration, aggregation, and segregation of components such as a colorant and a resin can be more reliably prevented.

  In particular, when the liquid medium contains 1,3-butylene glycol diacetate, the solubility parameter (SP value) is close to that of a curable resin or a dispersant as will be described later, so that the dispersion stability of the ink is high and long-term. The viscosity change is small across. Moreover, the solubility of water in the liquid medium can be made moderate. For this reason, the liquid medium of the ink reliably prevents excessive moisture absorption from the outside, and even when some moisture is mixed inside the ink flow path of the droplet discharge device, By suitably dissolving water, it is possible to move in the flow path while maintaining dispersion stability and fluidity.

Moreover, it is good also as a liquid medium using multiple types of compounds as mentioned above.
For example, the liquid medium may include a first liquid medium as a liquid medium as a main component and a second liquid medium as a subcomponent.
In such a case, the second liquid medium is preferably a glycol condensate monoalkyl ether having an average degree of polymerization of 4 to 10. The glycol condensate monoalkyl ether is a compound in which the terminal hydroxyl group of the glycol condensate is substituted with an alkyl group.

  The glycol condensate monoalkyl ether having the average polymerization degree as described above is a compound having a relatively high boiling point and capable of reducing the thixotropic property of the ink. By including the glycol condensate monoalkyl ether, the color filter ink is thixotropic due to the glycol condensate monoalkyl ether remaining in the ink even when a certain amount of the liquid medium is volatilized from the color filter ink. As a result, it is possible to maintain the high fluidity for a relatively long time. For this reason, even when the liquid medium is volatilized from a specific portion at the time of forming the colored portion, the color filter ink can be more uniformly mixed, and the solid content of the ink is concentrated on the portion. Is prevented. As a result, the color filter ink in the cell has a uniform solid content concentration in each portion, and can lose its fluidity and solidify when the surface is flat. As a result, the brightness and contrast ratio of the manufactured color filter are particularly excellent. Further, the effect of the glycol condensate monoalkyl ether as described above is remarkably exhibited particularly in the initial stage when the liquid medium is removed.

  Glycols constituting the glycol condensate monoalkyl ether are not particularly limited. For example, ethylene glycol, 1,2-propanediol, 1,3-propanediol and other propanediols, various butanediols, various pentanediols, various types A hexanediol etc. are mentioned, Among these, it can use 1 type or in combination of 2 or more types. Of these, ethylene glycol, 1,2-propanediol, and 1,3-propanediol are preferably used. Thereby, it is possible to sufficiently suppress an increase in the thixotropic property of the ink when forming the colored portion while sufficiently reducing the ink viscosity for the color filter.

The average degree of polymerization of the glycol condensate monoalkyl ether may be within the above-mentioned range, but is preferably 4-8. Thereby, while making the ink viscosity for color filters sufficiently low, the increase in thixotropic property of the ink at the time of forming the colored portion can be sufficiently suppressed, and the ink can maintain high fluidity.
The weight average molecular weight of the glycol condensate monoalkyl ether is preferably 210 to 500, and more preferably 210 to 400. Thereby, it is possible to sufficiently suppress an increase in thixotropic property of the ink at the time of forming the colored portion while sufficiently reducing the viscosity of the color filter ink.

Further, the terminal alkyl group of the glycol condensate monoalkyl ether may be linear or may have a branched chain.
The number of carbon atoms of the terminal alkyl group of the glycol condensate monoalkyl ether is preferably 1 to 5, more preferably 1 to 3, and still more preferably 1. Thereby, it is possible to sufficiently suppress an increase in thixotropic property of the ink at the time of forming the colored portion while sufficiently reducing the viscosity of the color filter ink.

Further, when the glycol condensate monoalkyl ether is a mixture of components having different polymerization degrees and molecular weights (for example, a mixture of glycol condensate monoalkyl ethers having a polymerization degree of 4 to 8), these plural components are stepwise. Volatilizes. For this reason, at the time of forming the colored portion, the ink can have high fluidity for a longer period of time.
Further, for example, the first liquid medium can have a relatively low boiling point, and the second liquid medium can have a higher boiling point than the first liquid medium. Thereby, at the time of removal of the liquid medium as described later, the first liquid medium volatilizes first with priority. The second liquid medium is retained in the color filter ink for a relatively long period of time. For this reason, the color filter ink in the cell can maintain fluidity for a relatively long time.

In such a case, the boiling point of the second liquid medium is preferably 5 to 80 ° C., more preferably 10 to 70 ° C. higher than the boiling point of the first liquid medium. Thereby, the color filter ink can maintain fluidity for a longer period when the colored portion is formed.
When the color filter ink includes the first liquid medium and the second liquid medium as the liquid medium, the content of the first liquid medium in the color filter ink is the second liquid. When the content of the sex medium is 100 parts by weight, it is preferably 100 to 2000 parts by weight, and more preferably 150 to 1000 parts by weight. Thereby, the color filter ink can maintain fluidity for a longer period when the colored portion is formed. In addition, productivity when manufacturing a color filter is improved.

  Moreover, it is preferable that it is 0.5-20 mPa * s, and, as for the viscosity in 25 degreeC of a liquid medium, it is more preferable that it is 1-18 mPa * s. As described above, since the liquid medium has a sufficiently low viscosity, the viscosity of the color filter ink can be made sufficiently low, and the uniformity of the droplets of the color filter ink and the stability of the discharge amount can be achieved. Can be made particularly excellent. The measurement of the viscosity of a liquid such as a liquid medium can be performed, for example, using an E-type viscometer (for example, RE-01 manufactured by Toki Sangyo Co., Ltd.) under the condition of 60 rpm, and particularly compliant with JIS Z8803. Can be done.

  The boiling point of the liquid medium under atmospheric pressure (1 atm) is preferably 160 to 300 ° C, more preferably 180 to 290 ° C, and further preferably 200 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 0.7 mmHg or less, and more preferably 0.1 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%, more preferably 55 to 95 wt%, and even more preferably 65 to 93 wt%. When the content of the liquid medium is a value within the above range, the color filter ink is excellent in the discharge property from the droplet discharge head, and the manufactured color filter has excellent durability. can do. In addition, a sufficient color density can be ensured in the manufactured color filter.

<Flating agent>
The color filter ink preferably contains a flattening agent for flattening the colored portion. The flattening agent flattens the colored part when forming the colored part. Thereby, the coloring part can satisfy the relationship of the above-mentioned formula more easily and reliably.
The planarizing agent that can be used in the color filter ink is not particularly limited as long as it has a function of planarizing the colored portion during the production of the color filter. Examples thereof include polyhydric alcohols and various surfactants.

[Polyhydric alcohol]
The polyhydric alcohol has a function of flattening the colored portion by reducing the thixotropic property of the color filter ink when the colored portion is formed.
In general, the colored portion is formed by applying a color filter ink to a cell formed by partition walls, removing a liquid medium from the applied color filter ink, and further solidifying the color filter ink. . In such a case, the solid content concentration of the colorant or the resin material described later in the color filter ink in the cell increases, and the thixotropic property and viscosity of the color filter ink are removed as the liquid medium is removed. Rises. In particular, when a pigment is used as the colorant, such an increase in thixotropic property becomes remarkable. As described above, since the thixotropic property is high, the color filter ink loses fluidity and easily solidifies even when the viscosity is relatively low.

  In addition, when the ink is dried by heating or vacuum drying, a phenomenon in which the ink is thermally convected (benard cell phenomenon) occurs in the cell due to volatilization of the liquid medium from the outer surface of the ink. In addition, due to heat distribution in the ink in the cell, volatilization of the liquid medium in the ink tends to occur from a specific portion of the cell. For this reason, the color filter ink in the cell does not have a uniform thickness and is easily uneven.

  As described above, when the convection of the ink in the cell and the volatilization of the liquid medium from a specific portion occur while the viscosity and thixotropic property of the color filter ink are increased, the color filter ink At a relatively early stage of removal, the shape with irregularities loses fluidity and solidifies. In such a case, the surface of the colored part to be formed has many irregularities.

  On the other hand, since the color filter ink contains a polyhydric alcohol, the polyhydric alcohol remains even when the majority of the liquid medium is removed from the color filter ink. An increase in thixotropic property can be suppressed, and fluidity can be maintained for a relatively long time. In addition, the color filter ink has a relatively high viscosity when a certain amount of the liquid medium is removed, and convection is suppressed. As described above, since the color filter ink has fluidity while suppressing the convection of the color filter ink for a relatively long time when the colored portion is formed, the surface of the color filter ink in the cell is flat. It loses fluidity in the state and can solidify. For this reason, when such a color filter ink is used, the formed colored portion has a uniform thickness, and the relationship of the above-described expression of the colored portion can be easily satisfied.

Such polyhydric alcohol is decomposed or volatilized and removed from the color filter ink by heating when forming the colored portion. For this reason, polyhydric alcohol hardly remains in the formed colored portion, and changes in chromaticity, brightness, etc. of the colored portion due to the polyhydric alcohol contained in the ink are extremely small.
In addition, by using the above-described glycol condensate monoalkyl ether in combination with a polyhydric alcohol in the ink, the glycol condensate monoalkyl ether is used in the ink when the liquid medium is volatilized when forming the colored portion. High fluidity can be maintained, and the solid content concentration of the ink in the cell can be made uniform. In addition, after most of the liquid medium is removed, the polyhydric alcohol is colored with a particularly uniform thickness and a particularly smooth surface by maintaining fluidity while preventing convection of ink in the cell. Part is formed.

  The polyhydric alcohol that can be used in the color filter ink is not particularly limited as long as it reduces the thixotropic property of the color filter ink as described above. For example, an oligomer of a diol compound can be used. May be an oligomer of glycols. Such a compound can easily reduce the thixotropic property of the color filter ink, and can suppress convection in the cell of the color filter ink during the formation of the colored portion. In particular, when the leveling agent is an oligomer of glycols, the effects as described above become more prominent.

  Examples of glycols constituting the oligomer of glycols include propanediols such as ethylene glycol, 1,2-propanediol, and 1,3-propanediol, various butanediols, various pentanediols, and various hexanediols. These can be used alone or in combination of two or more. Of these, ethylene glycol or 1,2-propanediol is preferably used as the glycols. In addition, an oligomer of glycols obtained by mixing and condensing ethylene glycol and 1,2-propanediol may be used, or an oligomer of ethylene glycol and an oligomer of 1,2-propanediol may be used in combination. Good.

  Further, the planarizing agent preferably has a hydroxyl group. For example, when an oligomer of glycols is used as the leveling agent, the terminal hydroxyl group is preferably not substituted. Thus, when the polyhydric alcohol has a hydroxyl group, the polarity of the polyhydric alcohol becomes relatively high, and the viscosity of the polyhydric alcohol easily falls within the range described later. In addition, the color filter ink has excellent affinity for a substrate (particularly a glass substrate) as described later, and the color filter ink can be suitably spread in the cell, and more easily A colored portion satisfying the relationship can be formed.

When the polyhydric alcohol is an oligomer, the degree of polymerization of the polyhydric alcohol is preferably 3 to 40, and more preferably 3 to 20. Thereby, the thixotropic property of the color filter ink can be sufficiently lowered, and the convection of the color filter ink in the cell can be suppressed when the colored portion is formed.
Moreover, it is preferable that the molecular weight of a polyhydric alcohol is 150-2000, It is more preferable that it is 180-1000, It is further more preferable that it is 180-500. Thereby, the thixotropic property of the color filter ink can be sufficiently lowered, and the convection of the color filter ink in the cell can be suppressed when the colored portion is formed.

  The polyhydric alcohol is preferably a liquid in an atmosphere of 25 ° C. and 1 atm. As described above, since the polyhydric alcohol is a liquid, it can be uniformly mixed in the color filter ink, and the solid content of the color filter ink at the time of forming the colored portion should be relatively small. Can do. For this reason, it is possible to more reliably suppress an increase in the thixotropic property of the ink when forming the colored portion.

Further, when the polyhydric alcohol is a liquid in the atmosphere as described above, the viscosity η ₆₀ [mPa · s] measured using a rotary viscometer under the conditions of 25 ° C. and 60 rpm is 40 to 400 mPa · s. It is preferable and it is more preferable that it is 50-300 mPa * s. By using a liquid having a relatively high viscosity in this manner, the color filter ink in the cell has a relatively high viscosity when the colored portion is formed, and convection in the cell is suppressed.

  The content of the polyhydric alcohol in the color filter ink is preferably 0.3 to 15.0 wt%, more preferably 0.4 to 13.0 wt%, and 0.5 to 6 More preferably, it is 0.0 wt%. Thereby, the discharge stability of the color filter ink droplets can be made particularly excellent while sufficiently reducing the thixotropic property of the color filter ink.

In addition, as an index of thixotropic property of the color filter ink, for example, the ratio of the obtained viscosity (thixotropic index) when the viscosity at two different rotational speeds is measured using a rotary E-type viscometer. ). Specifically, the viscosity measured with a color filter ink at 25 ° C. under the condition of 6 rpm is η ₆ [mPa · s], and the viscosity measured with the color filter ink at 25 ° C. under the condition of 60 rpm is η _{When it is 60} [mPa · s], the thixo index of the color filter ink can be η ₆ / η ₆₀ . In addition, thixotropic property is so high that (eta) ₆ / (eta) ₆₀ is large.
The thixo index (η ₆ / η ₆₀ ) of the color filter ink is specifically preferably 1.06 or less, more preferably 1.05 or less, and 1.03 or less. More preferably, the effects as described above can be obtained more remarkably.

[Surfactant]
The surfactant has a function of flattening the colored portion by reducing the surface tension of the ink. More specifically, when the surfactant is contained in the color filter ink, the surfactant is concentrated on the outermost layer of the color filter ink applied in the cell. The surface tension of the outermost layer of the color filter ink is lowered by the surfactant collected on the outermost layer of the color filter ink, and the unevenness generated on the outermost layer becomes flat. For this reason, the colored portion is flat and has a uniform thickness, and can easily satisfy the relationship of the above-described formula.

  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 A as described later, and can increase the brightness of the formed colored portion.

Further, the content of the surfactant in the color filter ink is preferably 0.005 to 5.0 wt%, and more preferably 0.01 to 2.0 wt%. Thereby, the colored part to be formed has a particularly flat and uniform thickness.
Further, as a planarizing agent, a surfactant and a polyhydric alcohol as described above may be used at the same time. As a result, the function of lowering the surface tension of the surfactant ink and the effect of suppressing the increase in thixotropic property of the polyhydric alcohol ink act synergistically, and the formed colored portion has a thickness at each site. Is particularly uniform and flat.

<Resin material>
The color filter ink usually contains a binder resin (resin material) for the purpose of improving the adhesion of the formed colored portion to the substrate. In addition, the binder resin is required to have solvent resistance in order to prevent adverse effects due to chemical application and washing in the subsequent process of the ink application process by the inkjet method. In the present invention, it is preferable to use a curable resin material as the binder resin.

[Curable resin material]
The curable resin material is generally excellent in adhesion to the substrate after curing. Therefore, the durability of the color filter can be improved by using a curable resin material as the binder resin.
The curable resin is not particularly limited. For example, various thermal chemical resins, energy ray curable resins such as a photocurable resin, and the like can be used, and the following curable resin materials are included. preferable. In general, when a large amount of a curable resin material is included in the ink, the viscosity tends to be high and the droplet ejection stability is not easily improved. Further, when the colored portion is formed, the thixotropic property of the color filter ink is likely to be improved by removing the liquid medium in the color filter ink. However, when the following curable resin material is used as the curable resin material, the viscosity of the ink is prevented from increasing even if a relatively large amount of the curable resin material is included. In addition, when the colored portion is formed, the thixotropic property of the color filter ink is prevented from increasing. For this reason, the colored part to be formed can easily satisfy the relationship of the above-described formula. Further, the obtained color filter is particularly excellent in durability.

Hereinafter, a curable resin material (curable resin composition) that can be suitably used for the color filter ink will be described in detail.
[Polymer A]
The polymer A contains at least an epoxy group-containing vinyl monomer a1 as a monomer component. The polymer A may consist essentially of a single compound, or may be a mixture of a plurality of types of compounds. However, when the polymer A is a mixture of a plurality of types of compounds, each compound contains at least an epoxy group-containing vinyl monomer a1 as a monomer component.

(Epoxy group-containing vinyl monomer a1)
The polymer A contains at least an epoxy group-containing vinyl monomer a1 as a monomer component. By containing such an epoxy group-containing vinyl monomer a1 as a monomer component, an epoxy group can be easily and reliably introduced into the polymer A. Further, by using such a curable resin containing a poxy group-containing vinyl monomer a1 together with the polyhydric alcohol as described above, it is easier to increase the thixotropic property of the ink at the time of forming the colored portion. Can be suppressed. Further, by containing the epoxy group-containing vinyl monomer a1 as a monomer component, the polymer A is prevented from being unintentionally cured during storage of the color filter ink and when ink is applied to the cells. The Further, the long-term storage stability and ejection stability of the color filter ink can be made particularly excellent. Moreover, the colored part formed using the ink for color filters can be made especially excellent in solvent resistance by containing the epoxy group containing vinyl monomer a1 as a monomer component. Further, by containing the epoxy group-containing vinyl monomer a1 as a monomer component, the curable resin material is cured under relatively mild conditions when forming the colored portion using the color filter ink. It is useful for improving the hardness and the like of the colored portion to be formed. In addition, when the polymer A contains a vinyl monomer a2, a vinyl monomer a3, and the like as described later, the polymer can be suitably synthesized, and the polymer A having desired characteristics can be easily obtained. And it can be obtained reliably.

  As the epoxy group-containing vinyl monomer a1, for example, one having a structure represented by the following formula (5) can be used. When the epoxy group-containing vinyl monomer a1 has such a structure, the effects as described above can be more remarkably obtained, and the compatibility between the polymer A and the polymer B described later is particularly improved. It can be made excellent, and the transparency of the colored portion formed using the color filter ink can be made particularly high.

In formula (5), examples of the alkyl group having 1 to 7 carbon atoms represented by R ⁶ include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, s-butyl, t-butyl, pentyl, hexyl, heptyl group An alkyl group such as a hydrogen atom or an alkyl group having 1 to 2 carbon atoms is preferable, and a hydrogen atom or a methyl group is more preferable. As a result, the polymer A is more reliably prevented from unintentionally curing when the color filter ink is stored and when ink is applied to the cells. Further, the long-term storage stability and ejection stability of the color filter ink can be made particularly excellent. Further, in the manufactured color filter, the contrast of the displayed image can be made particularly excellent. Moreover, the hardness etc. of the coloring part formed using the ink for color filters can be made excellent. Further, the compatibility between the polymer A and the polymer B described later can be made particularly excellent, and the transparency of the colored portion formed using the color filter ink can be made extremely high. it can.

In formula (5), a divalent hetero atom represented by G may be contained. As typical examples of the hydrocarbon group, a linear or branched alkylene group, more specifically, for example, methylene, ethylene, propylene, tetramethylene, ethylethylene, pentamethylene, hexamethylene, oxymethylene, Examples include oxyethylene and oxypropylene.
Specific examples of the epoxy group-containing vinyl monomer a1 include, for example, glycidyl (meth) acrylate, methyl glycidyl (meth) acrylate, ethyl glycidyl (meth) acrylate, glycidyl vinyl benzyl ether (manufactured by Seimi Chemical Co., Ltd., (Trade name VBGE), alicyclic epoxy group-containing unsaturated compounds represented by the following formulas (5-1) to (5-31), and the like, and one or more selected from these are combined As the epoxy group-containing vinyl monomer a1, (3,4-epoxycyclohexyl) methyl (meth) acrylate is particularly preferable. Thereby, the polymer A can acquire the effect as mentioned above more notably.

In formulas (5-1) to (5-31), R ⁷ represents a hydrogen atom or a methyl group, R ⁸ represents a divalent hydrocarbon group having 1 to 8 carbon atoms, and R ⁹ represents And a C1-C20 divalent hydrocarbon group. R ⁷ , R ⁸ and R ⁹ may be the same or different from each other. Moreover, w shows 0-10.
The content of the epoxy group-containing vinyl monomer a1 in the polymer A (value obtained by conversion in terms of the weight of the monomer used for the synthesis of the polymer) is preferably 50 to 99 wt%, and preferably 70 to More preferably, it is 94 wt%. When the content of the epoxy group-containing vinyl monomer a1 in the polymer A is a value within the above range, by using it together with the polyhydric alcohol as described above, the thixotropic property of the ink can be improved when forming the colored portion. It is possible to more easily suppress the rise. In addition, the polymer A is more reliably prevented from being unintentionally cured when the color filter ink is stored or when ink is applied to the cells. Further, the long-term storage stability and ejection stability of the color filter ink can be made particularly excellent. Further, when the content of the epoxy group-containing vinyl monomer a1 in the polymer A is a value within the above range, it is cured under relatively mild conditions when forming the colored portion using the color filter ink. The resin material can be cured and the hardness, solvent resistance, and the like of the colored portion to be formed can be made particularly excellent.

  In addition, when the polymer A is a mixture of a plurality of types of compounds, the content of the epoxy group-containing vinyl monomer a1 is a weighted average value (weighted average value based on a weight ratio) for these compounds. ) Can be adopted. Moreover, when the polymer A is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the epoxy group-containing vinyl monomer a1 with the content as described above.

(Vinyl monomer a2)
The polymer A only needs to contain at least an epoxy group-containing vinyl monomer a1 as a monomer component. In addition to the epoxy group-containing vinyl monomer a1, the polymer A further has an isocyanate group or a protective group. It is preferably a copolymer (copolymer) containing a vinyl monomer a2 having a blocked isocyanate group protected with a group as a monomer component. As a result, the gas content in the color filter ink (dissolved gas, bubbles present as microbubbles, etc.) can be lowered more effectively, and the droplet discharge stability by the ink jet method is particularly excellent. It will be a thing. Further, since there are few air bubbles contained in the color filter ink, it is possible to prevent bursting of the air bubbles in the color filter ink at the time of forming the colored portion, and the colored portion can be made particularly flat and formed. The colored part can more easily satisfy the relationship of the above formula. As a result, in the manufactured color filter, it is possible to more effectively prevent color unevenness, density unevenness, and characteristic variation among individuals from occurring in each part.

Examples of the polymerizable vinyl monomer a2 include 2-acryloyloxyethyl isocyanate (manufactured by Showa Denko KK, trade name “Karenz MOI”), 2-methacryloyloxyethyl isocyanate, etc., (meth) acryloyl groups having a carbon number. (Meth) acryloyl isocyanate etc. which couple | bonded with the isocyanate group through 2-6 alkylene groups are mentioned.
The isocyanate group of the (meth) acryloyl isocyanate is preferably a blocked isocyanate group. The blocked isocyanate group here refers to an isocyanate group whose end is masked with a blocking agent. Examples of the monomer having a blocked isocyanate group include 2- (0- [1′methylpropylideneamino] carboxyamino) ethyl methacrylate and the like, and “Karenz MOI-BM” manufactured by Showa Denko KK It is marketed with the brand name. These polymerizable vinyl monomers can be used alone or in combination of two or more.

  The content of the vinyl monomer a2 in the polymer A (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is 2 with respect to 100 parts by weight of the epoxy group-containing vinyl monomer a1. It is preferably ˜20 parts by weight, more preferably 3 to 15 parts by weight. When the content of the vinyl monomer a2 in the polymer A is a value within the above range, the gas content in the color filter ink while sufficiently improving the long-term storage stability of the color filter ink and the like. (Dissolved gas, bubbles present as microbubbles, etc.) can be reduced more effectively, and the stability of droplet ejection by the ink jet method is particularly excellent. Moreover, the transparency of the colored part formed using the color filter ink can be made sufficiently high.

  In addition, when the polymer A 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 vinyl monomer a2. can do. Moreover, when the polymer A is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the vinyl monomer a2 with the content as described above.

(Vinyl monomer a3)
The polymer A only needs to contain at least an epoxy group-containing vinyl monomer a1 as a monomer component. In addition to the epoxy group-containing vinyl monomer a1, the polymer A further includes a vinyl monomer having a hydroxyl group. It is preferable that the monomer a3 is contained as a monomer component (copolymer). As a result, the adhesion of the colored portion formed using the color filter ink to the substrate, particularly the adhesion when repeatedly exposed to a rapid temperature change accompanying image display, is particularly excellent. it can. As a result, for example, even when the color filter is used for a long period of time, it is possible to more reliably prevent problems such as light leakage (white spots, bright spots). That is, the durability of the color filter can be made particularly excellent. Further, if the polymer A contains the vinyl monomer a3 as a monomer component, the compatibility between the polymer A and the polymer B described later can be made particularly excellent. The transparency of the colored portion formed using the color filter ink can be made extremely high.

  Examples of the vinyl monomer a3 include 2-hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, 2,3-dihydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 6-hydroxyhexyl. Monoesterified product of polyhydric alcohol and acrylic acid or methacrylic acid, such as (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 4-hydroxymethylcyclohexyl (meth) acrylate, polyalkylene glycol mono (meth) acrylate, Compounds obtained by ring-opening polymerization of ε-caprolactone to the monoesterified product of polyhydric alcohol and acrylic acid or methacrylic acid (Dacel Chemical Industries, Ltd. Plaxel FA series, Plaxel FM series, etc.) or ethylene Kisaido compound was ring-opening polymerization of propylene oxide and the like, may be used alone or in combination of two or more selected from these.

  The content of the vinyl monomer a3 in the polymer A (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is 2 with respect to 100 parts by weight of the epoxy group-containing vinyl monomer a1. It is preferably ˜20 parts by weight, more preferably 3 to 15 parts by weight. When the content of the vinyl monomer a3 in the polymer A is a value within the above range, the color filter ink is manufactured using the color filter ink while sufficiently improving the long-term storage stability of the color filter ink. The durability of the color filter can be made particularly excellent. Moreover, the transparency of the colored part formed using the color filter ink can be increased. In addition, the ejection stability of ink droplets is particularly excellent.

  In addition, when the polymer A 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 vinyl monomer a3. can do. Moreover, when the polymer A is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the vinyl monomer a3 with the content as described above.

(Other polymerizable vinyl monomer a4)
The polymer A contains the above-mentioned epoxy group-containing vinyl monomer a1, vinyl monomer a2, and polymerizable vinyl monomer a4 other than the vinyl monomer a3 as monomer components. Also good. As such a polymerizable vinyl monomer a4, a vinyl monomer copolymerizable with the epoxy group-containing vinyl monomer a1 can be used, and specifically, for example, methyl (meth) acrylate, ethyl (Meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, phenyl (meth) acrylate, cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentanyloxyethyl (meth) acrylate Alkyl having 1 to 12 carbon atoms such as isobornyl (meth) acrylate, benzyl (meth) acrylate, and phenylethyl (meth) acrylate, aralkyl (meth) acrylate; vinyl aromatic compounds such as styrene and α-methylstyrene; CF ₃ (CF ₂ ) ₃ CH ₂ CH═C H ₂ , CF ₃ (CF ₂ ) ₃ CH═CH ₂ , CF ₃ (CF ₂ ) ₅ CH ₂ CH═CH ₂ , CF ₃ (CF ₂ ) ₅ CH═CH ₂ , CF ₃ (CF ₂ ) ₇ CH═ CH ₂ , CF ₃ (CF ₂ ) ₉ CH ₂ CH═CH ₂ , CF ₃ (CF ₂ ) ₉ CH═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₂ CH ₂ CH═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₂ CH═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₄ CH ₂ CH═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₄ CH═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₆ CH ₂ CH═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₆ CH═CH ₂ , F ₅ C ₆ CH═CH ₂ , CF ₃ (CF ₂ ) ₅ CH ₂ CH ₂ OCH ₂ CH═CH ₂ , CF ₃ (CF ₂ ) ₅ CH ₂ CH ₂ CH ₂ OCH ₂ CH═CH ₂ , CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ OCH ₂ CH═CH ₂ , CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ CH ₂ OCH ₂ CH═CH ₂ , CF ₃ (CF ₂ ) ₉ CH ₂ CH ₂ OCH ₂ CH═CH ₂ , CF ₃ (CF ₂ ) ₉ CH ₂ CH ₂ CH ₂ OCH ₂ CH═CH ₂ , H (CF ₂ ) ₆ CH ₂ OCH _{2 CH = CH 2, H (CF} 2) 8 CH 2 OCH 2 CH = CH 2, (CF 3) 2 CF (CF 2) 2 CH 2 CH 2 OCOCH = CH 2, (CF 3) 2 CF (CF 2) ₂ CH ₂ CH ₂ OCOC (CH ₃ ) ═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₄ CH ₂ CH ₂ OCOCH═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₄ CH ₂ C H ₂ OCOC (CH ₃ ) ═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₆ CH ₂ CH ₂ OCOCH═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₆ CH ₂ CH ₂ OCOC (CH ₃ ) = CH ₂ , CF ₃ (CF ₂ ) ₅ CH ₂ CH ₂ OCOCH═CH ₂ , CF ₃ (CF ₂ ) ₅ CH ₂ CH ₂ OCOC (CH ₃ ) ═CH ₂ , CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ OCOCH═CH ₂ , CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ OCOC (CH ₃ ) ═CH ₂ , CF ₃ (CF ₂ ) ₉ CH ₂ CH ₂ OCOCH═CH ₂ , CF ₃ (CF ₂ ) _{9 CH 2 CH 2 OCOC (CH 3} ) = CH 2, H (CF 2) 6 CH 2 CH 2 OCOCH = CH 2, H (CF 2) 8 CH 2 CH 2 OCOC (CH 3) = _{H 2, F (CF 2)} 8 CH 2 CH 2 OCOCH = CH 2, F (CF 2) 8 CH 2 CH 2 OCOC (CH 3) = CH 2, H (CF 2) 4 CH 2 OCOC (CH 3) Fluoroalkyl groups or fluoroaryl group-containing vinyl compounds such as ═CH ₂ , H (CF ₂ ) ₄ CH ₂ OCOCH═CH _{2 and the} like, and one or more selected from these may be used in combination. it can. However, the polymer A does not contain an alkoxysilyl group-containing vinyl monomer b1 as described later as a monomer component.

  The content of the polymerizable vinyl monomer a4 in the polymer A (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is 100 parts by weight of the epoxy group-containing vinyl monomer a1. , Preferably 20 parts by weight or less, and more preferably 10 parts by weight or less. In addition, when the polymer A is a mixture of a plurality of types of compounds, the value of the content of the polymerizable vinyl monomer a4 is a weighted average value (weighted average value based on weight ratio) for these compounds. Can be adopted. Moreover, when the polymer A is a mixture of a plurality of types of compounds, it is preferable that the content of the polymerizable vinyl monomer a4 satisfies the above conditions for each compound.

  As described above, the polymer A only needs to contain at least an epoxy group-containing vinyl monomer a1 as a monomer component, but in addition to the epoxy group-containing vinyl monomer a1, It is preferable to contain the body a2 and the vinyl monomer a3. Thereby, the effect by including the vinyl monomer a2 as described above and the effect by including the vinyl monomer a3 as described above can be compatible.

Although the ratio (content rate) of the polymer A in the curable resin material is not particularly limited, it is preferably 25 to 80 wt%, and more preferably 33 to 70 wt%. In addition, when the polymer A is a mixture of a plurality of types of compounds, the total content of these compounds is adopted as the content of the polymer A.
The weight average molecular weight of the polymer A is preferably 1000 to 50000, more preferably 1200 to 10000, and further preferably 1500 to 5000. When the weight average molecular weight of the polymer A is in such a relatively low range, the increase in thixotropic property of the color filter ink as described above is more effectively suppressed.

[Polymer B]
In the color filter ink, the curable resin material may include a polymer B containing at least an alkoxysilyl group-containing vinyl monomer b1 represented by the following formula (1) as a monomer component. preferable.

The polymer B may consist essentially of a single compound, or may be a mixture of a plurality of types of compounds. However, when the polymer B is a mixture of a plurality of types of compounds, each compound contains at least an alkoxysilyl group-containing vinyl monomer b1 as a monomer component.
Since such a polymer B contains an alkoxysilyl group, it has a high affinity with a substrate (particularly a glass substrate) that supports the colored portion of the color filter. For this reason, when the ink contains the polymer B as the curable resin material, the ink ejected onto the substrate can suitably spread on the substrate, and the resulting colored portion has a particularly uniform thickness. It can be. That is, the colored portion can be made flatter and the relationship of the above equation can be satisfied more easily. For this reason, the obtained color filter is particularly excellent in brightness and contrast ratio. Moreover, since the polymer B has high affinity with respect to a board | substrate, the coloring part of the color filter obtained can make the adhesiveness with respect to a board | substrate especially excellent. Moreover, by having such a polymer B, the hardening of the polymer A can be supplemented, and the colored portion can be formed under relatively mild conditions, and the hardness and light resistance of the formed colored portion can be formed. The heat resistance and the like can be made sufficiently excellent.

(Alkoxysilyl group-containing vinyl monomer b1)
The polymer B contains at least the alkoxysilyl group-containing vinyl monomer b1 represented by the formula (1) as a monomer component. By containing such an alkoxysilyl group-containing vinyl monomer b1 as a monomer component, an alkoxysilyl group can be easily and reliably introduced into the polymer B. Further, by containing the alkoxysilyl group-containing vinyl monomer b1 as a monomer component, the curing of the polymer A is performed when the curable resin material (curable resin composition) is cured to form a colored portion. The colored portion can be formed under relatively mild conditions, and the formed colored portion has sufficient hardness, adhesion to the substrate, light resistance, heat resistance, etc. Can be. Further, when the polymer B contains a vinyl monomer b2 or the like as will be described later, the synthesis of the polymer can be suitably performed, and the polymer B having desired characteristics can be obtained easily and reliably. it can.

In the formula (1), examples of the alkyl group having 1 to 7 carbon atoms represented by R ¹ include, for example, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, s-butyl, t-butyl, pentyl, hexyl, heptyl group An alkyl group such as a hydrogen atom or an alkyl group having 1 to 2 carbon atoms is preferable, and a hydrogen atom or a methyl group is more preferable. Thereby, the discharge stability of the ink droplets can be made particularly excellent. Moreover, the hardness of the colored part to be formed, adhesion to the substrate, light resistance, heat resistance and the like can be made particularly excellent. Further, the compatibility between the polymer A and the polymer B can be made particularly excellent, and the transparency of the colored portion formed using the color filter ink can be made particularly high.

  In the formula (1), as a representative example of the divalent hydrocarbon group represented by E, a linear or branched alkylene group, more specifically, for example, methylene, ethylene, propylene, tetramethylene, Examples include ethylethylene, pentamethylene, hexamethylene and the like. Among these, a C1-C3 linear alkylene group (for example, a methylene, ethylene, a propylene group) is especially preferable.

In formula (1), the alkyl group having 1 to 6 carbon atoms represented by R ² , R ³ and R ⁴ is a linear or branched alkyl group such as methyl, ethyl, propyl, isopropyl, butyl, Examples include isobutyl, s-butyl, t-butyl, pentyl, hexyl group and the like. Examples of the alkoxyl group having 1 to 6 carbon atoms represented by R ² and R ³ include linear or branched alkoxyl groups such as methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, s-butoxy, t- Examples include butoxy, pentoxy, hexyloxy groups and the like.

  Specific examples of the monomer represented by the formula (1) include vinyltrimethoxysilane, vinyltriethoxysilane, vinylmethyldimethoxysilane, vinylmethyldiethoxysilane, and γ- (meth) acryloyloxypropyltrimethoxy. Silane, γ- (meth) acryloyloxypropylmethyldimethoxysilane, γ- (meth) acryloyloxypropylmethyldiethoxysilane, γ- (meth) acryloyloxypropyltriethoxysilane, β- (meth) acryloyloxyethyltrimethoxysilane And alkoxysilyl group-containing polymerizable unsaturated compounds such as γ- (meth) acryloyloxybutylphenyldimethoxysilane, and the like, and one or more selected from these can be used in combination.

  The content of the alkoxysilyl group-containing vinyl monomer b1 in the polymer B (value obtained by conversion in terms of the weight of the monomer used for the synthesis of the polymer) is preferably 70 to 100 wt%, and 80 More preferably, it is -100 wt%. When the content of the alkoxysilyl group-containing vinyl monomer b1 in the polymer B is a value within the above range, the curable resin material (curable resin composition) is cured to form a colored portion. Curing of the polymer A can be effectively compensated, and a colored part can be formed under milder conditions. Moreover, the uniformity of the shape of the colored part to be formed, hardness, adhesion to the substrate, light resistance, heat resistance and the like can be made particularly excellent. In addition, when the polymer B is a mixture of a plurality of types of compounds, the value of the content of the alkoxysilyl group-containing vinyl monomer b1 is a weighted average value (weighted average based on weight ratio) for these compounds. Value). Moreover, when the polymer B is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the alkoxysilyl group-containing vinyl monomer b1 at the content described above.

(Other polymerizable vinyl monomer b2)
The polymer B only needs to contain at least an alkoxysilyl group-containing vinyl monomer b1 as a monomer component. In addition to the alkoxysilyl group-containing vinyl monomer b1, the polymer B further contains an alkoxysilyl group. A polymerizable vinyl monomer b2 other than the vinyl monomer b1 may be contained as a monomer component. As such a polymerizable vinyl monomer b2, a vinyl monomer copolymerizable with the alkoxysilyl group-containing vinyl monomer b1 can be used. Specifically, for example, 2-hydroxyethyl (meta ) Acrylate, hydroxypropyl (meth) acrylate, 2,3-dihydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 4- For monoesterified products of polyhydric alcohol and acrylic acid or methacrylic acid, such as hydroxymethylcyclohexyl (meth) acrylate, polyalkylene glycol mono (meth) acrylate, and monoesterified products of polyhydric alcohol and acrylic acid or methacrylic acid ε-Caprolak A polymerizable vinyl monomer having a hydroxyl group, such as a compound obtained by ring-opening polymerization of ethylene (Placcel FA series, Plaxel FM series, etc. manufactured by Daicel Chemical Industries, Ltd.) or a compound obtained by ring-opening polymerization of ethylene oxide or propylene oxide; (Meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, phenyl (meth) acrylate, cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentanyloxy C1-C12 alkyl such as ethyl (meth) acrylate, isobornyl (meth) acrylate, benzyl (meth) acrylate, phenylethyl (meth) acrylate, aralkyl (meth) acrylate; styrene, α-methylstyrene Vinyl aromatic compounds such _{as; CF 3 (CF 2) 3} CH 2 CH = CH 2, CF 3 (CF 2) 3 CH = CH 2, CF 3 (CF 2) 5 CH 2 CH = CH 2, CF 3 ( CF ₂ ) ₅ CH═CH ₂ , CF ₃ (CF ₂ ) ₇ CH═CH ₂ , CF ₃ (CF ₂ ) ₉ CH ₂ CH═CH ₂ , CF ₃ (CF ₂ ) ₉ CH═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₂ CH ₂ CH═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₂ CH═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₄ CH ₂ CH═CH ₂ , ( _{CF 3) 2 CF (CF 2} ) 4 CH = CH 2, (CF 3) 2 CF (CF 2) 6 CH 2 CH = CH 2, (CF 3) 2 CF (CF 2) 6 CH = CH 2, F _{5 C 6 CH = CH 2,} CF 3 (CF 2 _{5 CH 2 CH 2 OCH 2 CH} = CH 2, CF 3 (CF 2) 5 CH 2 CH 2 CH 2 OCH 2 CH = CH 2, CF 3 (CF 2) 7 CH 2 CH 2 OCH 2 CH = CH 2, CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ CH ₂ OCH ₂ CH═CH ₂ , CF ₃ (CF ₂ ) ₉ CH ₂ CH ₂ OCH ₂ CH═CH ₂ , CF ₃ (CF ₂ ) ₉ CH ₂ CH ₂ CH ₂ OCH ₂ CH═CH ₂ , H (CF ₂ ) ₆ CH ₂ OCH ₂ CH═CH ₂ , H (CF ₂ ) ₈ CH ₂ OCH ₂ CH═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₂ CH _{2 CH 2 OCOCH = CH 2,} (CF 3) 2 CF (CF 2) 2 CH 2 CH 2 OCOC (CH 3) = CH 2, (CF 3) 2 CF (CF 2) 4 CH 2 CH 2 _{COCH = CH 2, (CF 3} ) 2 CF (CF 2) 4 CH 2 CH 2 OCOC (CH 3) = CH 2, (CF 3) 2 CF (CF 2) 6 CH 2 CH 2 OCOCH = CH 2, ( _{CF 3) 2 CF (CF 2} ) 6 CH 2 CH 2 OCOC (CH 3) = CH 2, CF 3 (CF 2) 5 CH 2 CH 2 OCOCH = CH 2, CF 3 (CF 2) 5 CH 2 CH 2 OCOC (CH ₃ ) ═CH ₂ , CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ OCOCH═CH ₂ , CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ OCOC (CH ₃ ) ═CH ₂ , CF ₃ (CF _{2 ) 9 CH 2 CH 2 OCOCH =} CH 2, CF 3 (CF 2) 9 CH 2 CH 2 OCOC (CH 3) = CH 2, H (CF 2) 6 CH 2 CH 2 OCOCH = _{H 2, H (CF 2)} 8 CH 2 CH 2 OCOC (CH 3) = CH 2, F (CF 2) 8 CH 2 CH 2 OCOCH = CH 2, F (CF 2) 8 CH 2 CH 2 OCOC (CH _{3) = CH 2, H (} CF 2) 4 CH 2 OCOC (CH 3) = CH 2, H (CF 2) 4 CH 2 OCOCH = CH 2 , etc. fluoroalkyl or fluoroaryl-containing vinyl monomers and the like of 1 type or 2 types or more selected from these can be used in combination. However, the polymer B does not contain the epoxy group-containing vinyl monomer a1 as described above as a monomer component. Moreover, it is preferable that the polymer B does not contain the above fluoroalkyl group or fluoroaryl group containing vinyl monomer as a monomer component.

  The content of the polymerizable vinyl monomer b2 in the polymer B (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 30 wt% or less, and is 20 wt% or less. Is more preferable. In addition, when the polymer B is a mixture of a plurality of types of compounds, the content of the polymerizable vinyl monomer b2 is a weighted average value (weighted average value based on the weight ratio) for these compounds. Can be adopted. Moreover, when the polymer B is a mixture of a plurality of types of compounds, it is preferable that the content of the polymerizable vinyl monomer b2 satisfies the above-described conditions for each compound.

  As described above, the polymer B only needs to contain at least the alkoxysilyl group-containing vinyl monomer b1 as a monomer component, and monomers other than the alkoxysilyl group-containing vinyl monomer b1. Although it may contain a component, it is preferably a homopolymer of an alkoxysilyl group-containing vinyl monomer b1. That is, it is preferable that the polymer B does not contain any component other than the alkoxysilyl group-containing vinyl monomer b1 as a monomer component. Thereby, the discharge stability of the color filter ink and the durability of the color filter manufactured using the color filter ink can be made particularly excellent.

The ratio (content ratio) of the polymer B in the curable resin material is not particularly limited, but is preferably 20 to 60 wt%, and more preferably 25 to 55 wt%. In addition, when the polymer B is a mixture of a plurality of types of compounds, the total content of these compounds is adopted as the content of the polymer B.
The weight average molecular weight of the polymer B is preferably 1000 to 50000, more preferably 1200 to 10000, and further preferably 1500 to 5000. Thus, the color filter ink has particularly excellent affinity for the substrate, and the ink can quickly spread on the substrate.

  Further, when the polymer A and the polymer B are included as the curable resin material, the ratio of the content ratio of the polymer A and the content ratio of the polymer B is 25:75 to 75:25 by weight ratio. It is preferable that it is 45:55 to 55:45. By satisfying such conditions, the color filter ink can be suitably wetted and spread on the glass substrate when the ink is applied to the cell, and the thixotropic property of the color filter ink when the colored portion is formed. Rise is more effectively suppressed. Further, the discharge stability of the color filter ink can be made particularly excellent. In addition, color filters manufactured using color filter inks can more reliably prevent color unevenness and density unevenness at each part, and are particularly excellent in uniformity of characteristics among individuals. It can be. Further, the durability of the color filter can be made particularly excellent.

[Polymer C]
The curable resin material (curable resin composition) further includes a polymer C containing a fluoroalkyl group- or fluoroaryl group-containing vinyl monomer c1 represented by the following formula (6) as a monomer component. May be included.

By including such a polymer C, the discharge stability of the color filter ink can be made particularly excellent. In particular, the liquid breakage from the nozzle of the droplet discharge head is improved. Further, the heat resistance of the colored portion formed using the color filter ink can be made particularly excellent.
The polymer C may be substantially composed of a single compound, or may be a mixture of a plurality of types of compounds. However, when the polymer C is a mixture of a plurality of types of compounds, each compound contains at least a fluoroalkyl group- or fluoroaryl group-containing vinyl monomer c1 as a monomer component.

(Fluoroalkyl group or fluoroaryl group-containing vinyl monomer c1)
The polymer C contains at least a fluoroalkyl group- or fluoroaryl group-containing vinyl monomer c1 represented by the formula (6) as a monomer component. By containing such a fluoroalkyl group or fluoroaryl group-containing vinyl monomer c1 as a monomer component, the fluoroalkyl group or fluoroaryl group can be easily and reliably introduced into the polymer C. Further, by containing the fluoroalkyl group- or fluoroaryl group-containing vinyl monomer c1 as a monomer component, the discharge stability of the color filter ink can be made particularly excellent. In particular, the ink drainage from the nozzle can be made particularly excellent. Further, the heat resistance of the colored portion formed using the color filter ink can be made particularly excellent. Further, when the polymer C contains a vinyl monomer c2 or the like as will be described later, the polymer can be synthesized suitably, and the polymer C having desired characteristics can be obtained easily and reliably. it can.

In formula (6), examples of the alkyl group having 1 to 7 carbon atoms represented by R ⁵ include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, s-butyl, t-butyl, pentyl, hexyl and heptyl groups. An alkyl group such as a hydrogen atom or an alkyl group having 1 to 2 carbon atoms is preferable, and a hydrogen atom or a methyl group is more preferable. Thereby, the discharge stability of the color filter ink and the heat resistance of the colored portion formed using the color filter ink can be made particularly excellent.

  In the formula (6), as a typical example of the divalent hydrocarbon group represented by D (hydrocarbon group which may contain a hetero atom), a linear or branched alkylene group, more specifically, Examples include methylene, ethylene, propylene, tetramethylene, ethylethylene, pentamethylene, hexamethylene, oxymethylene, oxyethylene, and oxypropylene.

Specific examples of the monomer represented by the formula (6) include, for example, CF ₃ (CF ₂ ) ₃ CH ₂ CH═CH ₂ , CF ₃ (CF ₂ ) ₃ CH═CH ₂ , CF ₃ (CF ₂ ) ₅ CH ₂ CH═CH ₂ , CF ₃ (CF ₂ ) ₅ CH═CH ₂ , CF ₃ (CF ₂ ) ₇ CH═CH ₂ , CF ₃ (CF ₂ ) ₉ CH ₂ CH═CH ₂ , CF ₃ ( CF ₂ ) ₉ CH═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₂ CH ₂ CH═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₂ CH═CH ₂ , (CF ₃ ) ₂ CF ( _{CF 2) 4 CH 2 CH =} CH 2, (CF 3) 2 CF (CF 2) 4 CH = CH 2, (CF 3) 2 CF (CF 2) 6 CH 2 CH = CH 2, (CF 3) 2 _{CF (CF 2) 6 CH =} CH 2, F 5 C 6 CH = C _{2, CF 3 (CF 2)} 5 CH 2 CH 2 OCH 2 CH = CH 2, CF 3 (CF 2) 5 CH 2 CH 2 CH 2 OCH 2 CH = CH 2, CF 3 (CF 2) 7 CH 2 CH ₂ OCH ₂ CH═CH ₂ , CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ CH ₂ OCH ₂ CH═CH ₂ , CF ₃ (CF ₂ ) ₉ CH ₂ CH ₂ OCH ₂ CH═CH ₂ , CF ₃ (CF _{2) 9 CH 2 CH 2 CH} 2 OCH 2 CH = CH 2, H (CF 2) 6 CH 2 OCH 2 CH = CH 2, H (CF 2) 8 CH 2 OCH 2 CH = CH 2, (CF 3) ₂ CF (CF ₂ ) ₂ CH ₂ CH ₂ OCOCH═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₂ CH ₂ CH ₂ OCOC (CH ₃ ) ═CH ₂ , (CF ₃ ) ₂ CF (CF _{2) 4 CH 2 CH 2 OCOCH} = CH 2, (CF 3) 2 CF (CF 2) 4 CH 2 CH 2 OCOC (CH 3) = CH 2, (CF 3) 2 CF (CF 2) 6 CH 2 CH ₂ OCOCH═CH ₂ , (CF ₃ ) ₂ CF (CF ₂ ) ₆ CH ₂ CH ₂ OCOC (CH ₃ ) ═CH ₂ , CF ₃ (CF ₂ ) ₅ CH ₂ CH ₂ OCOCH═CH ₂ , CF ₃ (CF _{2) 5 CH 2 CH 2 OCOC} (CH 3) = CH 2, CF 3 (CF 2) 7 CH 2 CH 2 OCOCH = CH 2, CF 3 (CF 2) 7 CH 2 CH 2 OCOC (CH 3) = CH _{2, CF 3 (CF 2)} 9 CH 2 CH 2 OCOCH = CH 2, CF 3 (CF 2) 9 CH 2 CH 2 OCOC (CH 3) = CH 2, H (CF 2) 6 C _{2 CH 2 OCOCH = CH 2,} H (CF 2) 8 CH 2 CH 2 OCOC (CH 3) = CH 2, F (CF 2) 8 CH 2 CH 2 OCOCH = CH 2, F (CF 2) 8 CH 2 CH ₂ OCOC (CH ₃ ) ═CH ₂ , H (CF ₂ ) ₄ CH ₂ OCOC (CH ₃ ) ═CH ₂ , H (CF ₂ ) ₄ CH ₂ OCOCH═CH _{2 and the} like are selected from these One kind or a combination of two or more kinds can be used.

  The content of the fluoroalkyl group- or fluoroaryl group-containing vinyl monomer c1 in the polymer C (value obtained by conversion based on the weight of the monomer used for the synthesis of the polymer) is 15 to 100 wt%. Is preferable, and it is more preferable that it is 18-100 wt%. When the content of the fluoroalkyl group- or fluoroaryl group-containing vinyl monomer c1 in the polymer C is a value within the above range, the ejection stability of the color filter ink can be made particularly excellent. In particular, the ink drainage from the nozzle can be made particularly excellent. The heat resistance of the colored portion formed using the color filter ink can be made particularly excellent. Further, the compatibility of the polymer C with the polymer A or the polymer B can be made particularly excellent, and the transparency of the colored part formed using the color filter ink is made particularly high. Can do.

  When the polymer C is a mixture of a plurality of types of compounds, the value of the content of the fluoroalkyl group- or fluoroaryl group-containing vinyl monomer c1 is a weighted average value (weight ratio) for these compounds. Based weighted average). Further, when the polymer C is a mixture of a plurality of types of compounds, these compounds all contain the fluoroalkyl group- or fluoroaryl group-containing vinyl monomer c1 at the content as described above. Is preferred.

(Other polymerizable vinyl monomer c2)
The polymer C may contain a polymerizable vinyl monomer c2 other than the fluoroalkyl group or fluoroaryl group-containing vinyl monomer c1 as described above as a monomer component. As such a polymerizable vinyl monomer c2, a vinyl monomer copolymerizable with a fluoroalkyl group or fluoroaryl group-containing vinyl monomer c1 can be used. (Meth) acryloyl groups such as acryloyloxyethyl isocyanate (manufactured by Showa Denko KK, trade name “Karenz MOI”), 2-methacryloyloxyethyl isocyanate and the like are bonded to isocyanate groups via alkylene groups having 2 to 6 carbon atoms. Isocyanates or protective groups such as (meth) acryloyl isocyanate, 2- (0- [1′methylpropylideneamino] carboxyamino) ethyl methacrylate (manufactured by Showa Denko KK, trade name “Karenz MOI-BM”) A polymerizable vinyl monomer having a blocked isocyanate group protected with 2; -Hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, 2,3-dihydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meta ) Monoesterified product of polyhydric alcohol and acrylic acid or methacrylic acid, such as acrylate, 4-hydroxymethylcyclohexyl (meth) acrylate, polyalkylene glycol mono (meth) acrylate, etc., the polyhydric alcohol and acrylic acid or methacrylic acid A compound obtained by ring-opening polymerization of ε-caprolactone to a monoester product of the above (such as Plaxel FA series and Plaxel FM series manufactured by Daicel Chemical Industries, Ltd.), ethylene oxide, and propylene oxide. Polymerizable vinyl monomers having hydroxyl groups such as polymerized compounds; methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, phenyl (meth) acrylate, cyclohexyl ( 1 to 12 carbon atoms such as (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentanyloxyethyl (meth) acrylate, isobornyl (meth) acrylate, benzyl (meth) acrylate, phenylethyl (meth) acrylate, etc. Examples include alkyl, aralkyl (meth) acrylate; vinyl aromatic compounds such as styrene and α-methylstyrene, and one or more selected from these can be used in combination. However, the polymer C does not contain the epoxy group-containing vinyl monomer a1 and the alkoxysilyl group-containing vinyl monomer b1 as described above as monomer components.

  The content of the polymerizable vinyl monomer c2 in the polymer C (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 85 wt% or less, and is 82 wt% or less. More preferably. When the polymer C is a mixture of a plurality of types of compounds, the content of the polymerizable vinyl monomer c2 is a weighted average value (weighted average value based on weight ratio) for these compounds. Can be adopted. Further, when the polymer C is a mixture of a plurality of types of compounds, it is preferable that the content of the polymerizable vinyl monomer c2 satisfies the above conditions for each compound.

When the curable resin material contains the polymer C, the ratio (content ratio) of the polymer C in the curable resin material is not particularly limited, but is preferably 1 to 20 wt%, and 2 to 15 wt%. It is more preferable that In addition, when the polymer C is a mixture of a plurality of types of compounds, the total content of these compounds is adopted as the content of the polymer C.
The weight average molecular weight of the polymer C is preferably 1000 to 50000, more preferably 1200 to 10000, and further preferably 1500 to 5000. Thereby, in the color filter ink, the polymer C becomes relatively easy to flow, and an increase in thixotropic property of the color filter ink when the colored portion is formed can be suppressed.

  Further, when the curable resin material contains the polymer C, the ratio of the content ratio of the polymer A and the content ratio of the polymer C is preferably 50:50 to 99: 1 by weight ratio, More preferably, it is 60: 40-98: 2. By satisfying such conditions, the dispersion stability of the pigment in the color filter ink and the discharge stability of the color filter ink are particularly excellent, and the color unevenness and density unevenness in each part of the color filter are reduced. It can be prevented more effectively, and the uniformity of characteristics among individuals can be made particularly excellent, and the durability of the color filter can be made particularly excellent.

  The content of the curable resin material in the color filter ink is preferably 0.5 to 10 wt%, and more preferably 1 to 5 wt%. When the content of the curable resin material is a value within the above range, the color filter manufactured has a particularly excellent discharge property from the droplet discharge head, and the manufactured color filter has a particularly excellent durability. Can be. In addition, a sufficient color density can be ensured in the manufactured color filter.

The content of the curable resin material with respect to 100 parts by weight of the pigment is preferably 15 to 50 parts by weight, and more preferably 19 to 42 parts by weight. By satisfying such conditions, the dispersion stability of the pigment in the color filter ink and the discharge stability of the color filter ink are particularly excellent, and the color filter formed using the color filter ink The color developability and contrast of the colored portion can be made particularly excellent. Further, the adhesion of the colored portion to the substrate can be made particularly excellent.
The curable resin material constituting the color filter ink may include a polymer other than the polymer A, the polymer B, and the polymer C described above.

<Thermoplastic resin>
The color filter ink may contain a thermoplastic resin. Thereby, for example, when the color filter ink contains a pigment, the dispersibility of the pigment particles in the color filter ink can be made particularly excellent.
Examples of the thermoplastic resin include alginic acids, polyvinyl alcohol, hydroxypropyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose, styrene-acrylic acid resin, styrene-acrylic acid-acrylic ester resin, styrene-maleic acid resin, styrene- Maleic acid half ester resin, methacrylic acid-methacrylic acid ester resin, acrylic acid-acrylic acid ester resin, isobutylene-maleic acid resin, rosin-modified maleic acid resin, polyvinylpyrrolidone, gum arabic starch, polyallylamine, polyvinylamine, polyethyleneimine, etc. 1 type or 2 types or more selected from these can be used in combination.

The content of the thermoplastic resin in the color filter ink is not particularly limited, but is preferably 1.5 to 7.7 wt%, and more preferably 2.1 to 7.2 wt%.
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 ejection stability of ink droplets can be made particularly excellent. Further, when a pigment is contained in the color filter ink, the dispersant can contribute to improving the dispersibility of the pigment particles in the color filter ink.

  Although it does not specifically limit as a dispersing agent, For example, a polymeric dispersing agent can be used. Examples of the polymer dispersant include basic polymer dispersants, neutral polymer dispersants, acidic polymer dispersants, and the like. Examples of such polymeric dispersants include, for example, dispersants made of acrylic and modified acrylic copolymers, urethane dispersants, polyaminoamide salts, polyether esters, phosphate esters, and aliphatic polycarboxylic acids. And the like, and the like.

  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, DISPERBIC 111, DISPERBIC 112, DISPERBIC 116, DISPERBIC 140, DISPERBIC 142, DISPERBIC 160, DISPERBIC 161, DISPERBIC 162, DISPERBIC 163, DISPERBIC 164, DISPERBIC 166, DISPERBIC 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, Floren DOPA-17, Floren DOPA-22, Floren DOPA-44, Floren TG-710, Floren D-90 (manufactured by Kyoei Chemical Co., Ltd.), Anti-Terra-205 (Made by Big Chemie) etc. are mentioned, It can use combining 1 type (s) or 2 or more types selected from these.

  In particular, the color filter ink includes, as a dispersant, a dispersant having a predetermined acid value (hereinafter also referred to as an acid value dispersant) and a dispersant having a predetermined value (hereinafter also referred to as an amine value dispersant). It is preferable to include it simultaneously. Thereby, the effect by the acid value dispersing agent which exhibits the viscosity reduction effect which reduces the viscosity of the ink for color filters and the effect by the amine number dispersing agent which stabilizes the viscosity of the ink for color filters are compatible. Further, the effect of the surface tension acid value dispersant of the color filter ink and the effect of the amine value dispersant that improves the dispersibility of the solid content in the color filter ink are compatible. As a result, the discharge stability of the color filter ink droplets can be made particularly excellent. In particular, when a pigment is contained in the color filter ink, the pigment can be stably dispersed in a fine particle state, and an increase in thixotropic properties during formation of the colored portion can be suppressed.

  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, BYC Chemie) EFKA 5010, EFKA 5065, EFKA 5066, EFKA 5070, EFKA 7500, EFKA 7554 (above, manufactured by Ciba Specialty); Solsperse 3000, Solsperse 16000, Solsperse 17000, Solsperse 18000, Solsperse 36000, Solsperse 36000, (Above, manufactured by Lubrizol).

  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 Company); Azisper PB711 (manufactured by Ajinomoto Fine-Techno Company); Anti-Terra-205 (manufactured by Big Chemie Company) and the like.

  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 viscosity reduction and stabilization effect of the color filter ink when used in combination with the amine value dispersant as described above can be obtained more remarkably. . Further, when a pigment is contained in the color filter ink, the dispersion stability of the pigment can be made particularly excellent. 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 viscosity reduction and stabilization effect of the color filter ink when used in combination with the amine value dispersant as described above can be obtained more remarkably. . In addition, when a pigment is contained in the color filter ink, the dispersion stability of the pigment can be made particularly excellent. 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 discharge stability of the droplets can be made particularly excellent. .

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%], 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 It is more preferable that the relationship of ≦ (AV × X _A ) / (BV × X _B ) ≦ 1.5 is satisfied. 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 discharge stability of the droplets can be made particularly excellent. .
The content of the dispersant in the color filter ink is not particularly limited, but is preferably 2.5 to 10.2 wt%, and more preferably 3.2 to 9.2 wt%.

<Other ingredients>
The color filter ink 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; sensitizers; light stabilizers; Polymerization accelerators; various light stabilizers; fillers such as glass and alumina; vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, N- (2-aminoethyl) -3-aminopropyl Methyldimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxy Lan, 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-chloropropylmethyl Adhesion promoters such as dimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane; 2,2-thiobis (4-methyl-6-tert-butylphenol), Antioxidants such as 2,6-di-t-butylphenol; UV absorbers such as 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole and alkoxybenzophenone; polyacryl Anti-aggregation agents such as sodium acid It is.

  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 the polyvalent carboxylic acid anhydride 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 Polyhydric carboxylic acid 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 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, and more specific examples include, 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.) , Product name), CG-24-61 (product name, manufactured by Ciba Specialty Chemicals Co., Ltd.), DAICATII (product name, manufactured by Daicel Chemical Industries, Ltd.), UVAC1591 (product 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., 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.

  Further, the surface tension of the color filter ink at 25 ° C. is preferably 25 to 38 dyn / cm, more preferably 25 to 35 dyn / cm, and further preferably 25 to 32 dyn / cm. Thereby, the discharge property of the droplet can be made particularly stable. For this reason, the characteristic difference between individuals of the color filter to be manufactured can be made particularly small. As the surface tension, a value measured according to JIS K 3362 can be adopted.

  The viscosity of the color filter ink measured at 60 rpm using an E-type viscometer at 25 ° C. is preferably 13 mPa · s or less, more preferably 12 mPa · s or less, and 5 to 11 mPa · s. More preferably, it is s. Thus, when the viscosity of the color filter ink is sufficiently low, for example, the production efficiency of the color filter (formation efficiency of the colored portion) can be made particularly excellent, and the thickness of the colored portion It is possible to effectively prevent such unintentional variations.

<Ink set>
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). For 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 including a plurality 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 can be used to form colored portions of all colors. Is preferred.

  In particular, when the color filter has a green colored portion, the green color filter ink preferably contains the above-described flattening agent. In general, the green colored portion tends to have a large amount of colorant, and the shape of the ink tends to have irregularities when the colored portion is formed. However, by including such a flattening agent in the green color filter ink, the formed green colored portion can be flattened. That is, the green colored portion easily satisfies the above formula.

《Color filter manufacturing method》
Next, a method for manufacturing the color filter 1 as described above will be described.
4 is a cross-sectional view showing a method for manufacturing a color filter, FIG. 5 is a perspective view showing a droplet discharge device used for manufacturing the color filter, and FIG. 6 is a droplet discharge means in the droplet discharge device shown in FIG. FIG. 7 is a diagram showing the bottom surface of the droplet ejection head in the droplet ejection device shown in FIG. 5, and FIG. 8 is a diagram showing the droplet ejection head in the droplet ejection device shown in FIG. It is a figure, (a) is a cross-sectional perspective view, (b) is a cross-sectional view.

  As shown in FIG. 4, in this embodiment, a substrate preparation step (1a) for preparing the substrate 11, a partition formation step (1b, 1c) for forming the 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 solvent (liquid medium) from the color filter ink 2 to harden the curable resin material, thereby solid-state coloring And a colored portion forming step (1e) as a portion 12.

<Board preparation process>
First, the substrate 11 is prepared (1a). The substrate 11 prepared in this step is preferably subjected to a cleaning process. In addition, the substrate 11 prepared in this step has been 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 . 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 set to, 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.

<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.

The color filter ink 2 is discharged using a droplet discharge device as shown in FIGS.
As shown in FIG. 5, the droplet discharge device 100 used in this step is supplied with the color filter ink 2 from the tank 101 that holds the color filter ink 2, the tube 110, and the tube 110. A discharge scanning unit 102. 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 110, and the color filter ink 2 is compressed by compressed air from the tank 101 to each of the plurality of droplet discharge heads 114. Supplied.

  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 control device 104 and the second position control device 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 liquid droplet discharge means 103 are relative to each other). Move on).
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. 6, the droplet discharge means 103 includes 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. 7, 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 this embodiment, 90 nozzles 118 are arranged in a line in the X-axis direction at a constant interval LNP in each of the nozzle array 116A and the nozzle array 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, each of the nozzle row 116 </ b> A and the nozzle row 116 </ b> B includes 90 nozzles 118, and thus 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. 6, 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 discharge heads 114 in one row and the droplet discharge 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 the present 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 in which the color filter ink 2 supplied from the tank 101 through the hole 131 is always filled 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 via 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 addition, the nozzle plate 128 is provided so as to cover the base material made of stainless steel, the silica film mainly made of the silica compound, and provided so as to cover the silica film. And a liquid repellent film that contains the liquid repellent film.
Further, the silica film has a function of closely attaching the liquid repellent film and the stainless steel base material, and also has a function of protecting the stainless steel base material.

The control means 112 (see FIG. 5) 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 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 curable 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.

Moreover, in this embodiment, this process performs several heat processing from which temperature differs. Specifically, this process includes 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. .
In such a case, by heating the substrate 11 at a relatively low temperature in the first heat treatment, the convection of the color filter ink 2 is prevented, the liquid medium is gently removed, and the color filter ink 2 The surface can be solidified in a flat state. That is, in the first heat treatment, by removing the liquid medium while suppressing an increase in thixotropic property of the color filter ink, the shape of the formed colored portion can be fixed with a flat surface. it can. At this time, even if the curable resin is contained in the color filter ink 2, unintentional reaction of the curable resin can be prevented by heating at a relatively low temperature. In particular, when the color filter ink contains a polyhydric alcohol, the polyhydric alcohol can be prevented from volatilizing and decomposing by heating at a relatively low temperature. It can be easily flat.

  In the second heat treatment, the liquid medium that 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 the curable resin, the color filter ink 2 having a flat surface solidified in the first treatment can be efficiently cured in its shape. it can. Further, when the color filter ink 2 contains a polyhydric alcohol, the polyhydric alcohol can be efficiently volatilized or decomposed and removed. As a result, the colored portion 12 to be formed satisfies the relationship of the above expression more reliably.

In the first treatment as described above, the temperature of the heated substrate 11 is not particularly limited, but is preferably 30 to 100 ° C, and more preferably 40 to 80 ° C. Accordingly, the liquid medium can be suitably removed from the color filter ink 2 while reliably preventing the convection of the substrate 11 and the color filter ink 2 and the volatilization and decomposition of the polyhydric alcohol.
The time for the first heat treatment is not particularly limited, but is preferably 3 to 50 minutes, more preferably 5 to 40 minutes.

  In the second treatment as described above, the temperature of the heated substrate 11 is not particularly limited, but is preferably 120 to 280 ° C, and more preferably 150 to 250 ° C. As a result, the liquid medium that could not be removed by the first heat treatment can be completely removed, and the polyhydric alcohol can be efficiently volatilized or decomposed to be removed. Further, in this step, when the color filter ink 2 is cured by reacting the curable resin, the color filter ink 2 having a flat surface solidified in the first treatment can be efficiently cured in its shape. it can.

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.
Moreover, in this process, you may perform the process of irradiating an active energy ray or placing the board | substrate 11 to which the ink 2 for color filters was provided in a pressure-reduced environment, for example. By irradiating the active energy ray, the curing reaction of the curable resin material is allowed to proceed efficiently, or the curing reaction of the curable resin material is reliably advanced even when the heating temperature is relatively low. Thus, it is possible to obtain 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. Further, by placing the substrate 11 to which the color filter ink 2 is applied in a reduced pressure environment, the liquid medium can be reliably removed even when the heating temperature is relatively low. 11. The occurrence of adverse effects on the formed colored portion 12 and the like is more reliably prevented.

<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. 9 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. A liquid crystal layer 62 made of liquid crystal sealed in a gap between the polarizing plate 67 and a polarizing plate 67 provided on the surface of the substrate 11 of the color filter 1 opposite to the surface facing the liquid crystal layer 62 (lower side in the figure). And a polarizing plate 68 provided on the surface side opposite to the surface facing the liquid crystal layer 62 of the substrate 66 (upper side in the drawing). 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 the figure). 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 the figure).

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

FIG. 11 is a perspective view showing a configuration of a mobile phone (including PHS) to which the electronic apparatus of the invention is applied.
In this figure, a cellular phone 1200 is provided with an image display device 1000 in a display unit, together with a plurality of operation buttons 1202, an earpiece 1204, and a mouthpiece 1206.

FIG. 12 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 halide 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 imaging device 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 the display unit, and is configured to display based on an imaging signal from the CCD, and a finder that displays a subject 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, the effect of the present invention is more remarkably exhibited when applied to an electronic apparatus having a large display unit as described above.

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 the color filter ink corresponding to the colored portion of each color is applied to the cell, the liquid medium is removed from the color filter ink of each color in the cell and cured. In the above description, the resin material is cured, that is, the colored portion forming step is performed only once. However, the ink application step and the colored portion forming step may be repeatedly performed corresponding to each color.

  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.

In the embodiment described above, the case where the color filter ink set includes three (three colors) color filter inks corresponding to the three primary colors of light has been mainly described. The number and type (color) of the color filter ink to be configured are not limited to those described above. For example, the color filter ink set may include four or more color filter inks.
In the above-described embodiment, the colored portion forming process has been described as performing two-step heat treatment. However, the colored portion may be formed by one heat treatment, or in one heat treatment. The heating temperature may be changed.

Next, specific examples of the present invention will be described.
[1] Polymer synthesis (preparation of polymer solution)
(Synthesis Example 1)
In a 1 L reaction vessel equipped with a stirrer, reflux condenser, dropping funnel, nitrogen introduction tube and thermometer, 37.6 parts by weight of diethylene glycol monobutyl ether acetate as a solvent (solvent) was placed and heated to 90 ° C. Subsequently, 2,2′-azobis (isobutyronitrile) (AIBN): 2 parts by weight and diethylene glycol monobutyl ether acetate (solvent): 3 parts by weight were added, and (3,4) was added to the flask. -Epoxycyclohexyl) methyl methacrylate (manufactured by Daicel Chemical Industries, Ltd., trade name Cyclomer M100): 27 parts by weight, 2- (0- [1 ′ methylpropylideneamino] carboxyamino) ethyl methacrylate (Showa Denko Co., Ltd.) (Product name, MOI-BM): 1.5 parts by weight, 2-hydroxyethyl methacrylate (HEMA): 1.5 parts by weight was added dropwise over about 4 hours using a dropping pump. On the other hand, 2,2′-azobis (isobutyric acid) dimethyl (trade name V-601, manufactured by Wako Pure Chemical Industries, Ltd.) as a polymerization initiator: 5 parts by weight diethylene glycol monobutyl ether acetate (solvent): 20 parts by weight The dissolved solution (polymerization initiator solution) was dropped over about 4 hours using another dropping pump. After the dropping of the polymerization initiator solution was completed, 0.2 parts by weight of AIBN and 1 part by weight of diethylene glycol monobutyl ether acetate (solvent) were added and maintained at the same temperature for about 2 hours. 2 parts by weight and diethylene glycol monobutyl ether acetate (solvent): 1 part by weight is added and kept at about the same temperature for about 2 hours, and then cooled to about room temperature to contain the polymer A having a solid content of 30 wt%. A polymer solution A1 was obtained.

(Synthesis Examples 2 to 8)
Except for changing the type of monomer component used in the synthesis of the polymer (preparation of polymer solution), the amount used, and the type of solvent (solvent) as shown in Table 1, the same operation as in Synthesis Example 1 was performed. went. As a result, seven polymer solutions (polymer solutions A2 to A8) containing the polymer A and having a solid content of 30 wt% were obtained.

(Synthesis Example 9)
(3,4-epoxycyclohexyl) methyl methacrylate (manufactured by Daicel Chemical Industries, trade name Cyclomer M100), 2- (0- [1 ′ methylpropylideneamino] carboxyamino) ethyl methacrylate (Showa Denko K.K. Manufactured, trade name MOI-BM), and γ-methacryloxypropyltrimethoxysilane (manufactured by Dow Corning Toray, trade name SZ6030): 30 parts by weight instead of 2-hydroxyethyl methacrylate (HEMA) Except for the above, the same operation as in Synthesis Example 1 was performed. As a result, a polymer solution B1 (homopolymer solution) containing the polymer B and having a solid content of 30 wt% was obtained.

(Synthesis Examples 10-14)
The same operation as in Synthesis Example 9 was performed except that the types of monomer components used in the synthesis of the polymer (preparation of the polymer solution), the amount used, and the type of the solvent (solvent) were changed as shown in Table 1. went. As a result, five types of polymer solutions (polymer solutions B2 to B6) containing polymer B and having a solid content of 30 wt% were obtained.

(Synthesis Example 15)
(3,4-epoxycyclohexyl) methyl methacrylate (manufactured by Daicel Chemical Industries, trade name Cyclomer M100), 2- (0- [1′methylpropylideneamino] carboxyamino) ethyl methacrylate (Showa Denko Co., Ltd.) Manufactured, trade name MOI-BM), and 1H, 1H, 5H-octafluoropentyl methacrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd., trade name Biscote 8FM): 30 weight instead of 2-hydroxyethyl methacrylate (HEMA) The same operations as in Synthesis Example 1 were performed except that the parts were used. As a result, a polymer solution C1 (homopolymer solution) containing the polymer C and having a solid content of 30 wt% was obtained.

(Synthesis Examples 16 to 19)
The same operation as in Synthesis Example 15 was performed except that the types of monomer components used in polymer synthesis (preparation of polymer solution), the amounts used, and the types of solvents (solvents) were changed as shown in Table 1. went. As a result, four types of polymer solutions (polymer solutions C2 to C5) containing polymer C and having a solid content of 30 wt% were obtained.

(Synthesis Example 20)
As a monomer component, (3,4-epoxycyclohexyl) methyl methacrylate (manufactured by Daicel Chemical Industries, Ltd., trade name Cyclomer M100): 13.5 parts by weight, 2- (0- [1 ′ methylpropiyl methacrylate) Ridenamino] carboxyamino) ethyl (manufactured by Showa Denko KK, trade name MOI-BM): 0.75 parts by weight, 2-hydroxyethyl methacrylate (HEMA): 0.75 parts by weight, and γ-methacryloxypropyltri Methoxysilane (trade name SZ6030, manufactured by Toray Dow Corning Co., Ltd.): The same operation as in Synthesis Example 1 was performed except that 15 parts by weight was used. As a result, a polymer solution X1 containing polymer X and having a solid content of 30 wt% was obtained.

  Tables 1 and 2 summarize the types of materials used in the synthesis of polymers in Synthesis Examples 1 to 20 (preparation of polymer solutions) and the amounts used (compositions of polymers synthesized in Synthesis Examples 1 to 20). Indicated. In the table, “S” means a solvent (solvent), in particular, “S1” indicates diethylene glycol monobutyl ether acetate (boiling point: 246 ° C.), and “S2” indicates 1,3-butylene glycol. It indicates diacetate (boiling point: 232 ° C.), “S3” indicates 2- (2-methoxy-1-methylethoxy) -1-methylethyl acetate (boiling point: 213 ° C.), and “S4” indicates It shows bis (2-butoxyethyl) ether (boiling point: 256 ° C.), and “S5” shows ethyl 3-ethoxypropionate (boiling point: 170 ° C.). “V-601” indicates 2,2′-azobis (isobutyric acid) dimethyl, “AIBN” indicates 2,2′-azobis (isobutyronitrile), and “a1-1”. Indicates (3,4-epoxycyclohexyl) methyl methacrylate (cyclomer M100), “a1-2” indicates (3,4-epoxycyclohexyl) methyl acrylate, and “a2-1” indicates methacrylic acid. Acid 2- (0- [1′methylpropylideneamino] carboxyamino) ethyl (MOI-BM), “a2-2” is 2-acryloyloxyethyl isocyanate (manufactured by Showa Denko KK, trade name “ Karenz MOI ")," a3-1 "indicates 2-hydroxyethyl methacrylate (HEMA), and" a3-2 "indicates 4-hydride. “A4-1” indicates 1H, 1H, 5H-octafluoropentyl methacrylate (Biscoat 8FM), “a4-2” indicates 2-ethylhexyl methacrylate, “b1-1” represents γ-methacryloxypropyltrimethoxysilane (SZ6030), “b1-2” represents γ-methacryloxypropyltriethoxysilane, and “b2-1” represents ethyl methacrylate. “C1-1” indicates 1H, 1H, 5H-octafluoropentyl methacrylate (Biscoat 8FM), and “c1-2” indicates 2,2,3,3-tetrafluoropropyl acrylate (Biscoat 4F). "C2-1" is 2,3-dihydroxybutyl methacrylate It is shown, "c2-2" refers to cyclohexyl methacrylate. In the table, the weight average molecular weight Mw of the polymer constituting the polymer solution is also shown.

[2] Preparation of color filter ink (ink set) (ink set 1)
Dispersic 111: 5.04 g (14 parts by weight) as a dispersant, Dispersic 166: 28.07 g (78 parts by weight) as a dispersant, and SPCN-17X (made by Showa Polymer Co., Ltd.) as a thermoplastic resin ): 19.43 g (54 parts by weight) and diethylene glycol monobutyl ether acetate as a liquid medium: 91.05 g (253 parts by weight) were put into a stirrer (uniaxial mixer) having an internal capacity of 400 cc, and 10% by a disper mill. Dispersing agent dispersion liquid was obtained by carrying out preliminary dispersion by stirring for a minute (preliminary dispersion step). At this time, the rotation speed of the stirring blade of the stirrer was set to 2000 rpm.

Next, as described below, a fine dispersion step was performed in which a pigment was added to the dispersant dispersion obtained in the preliminary dispersion step, and inorganic beads were added in multiple stages for fine dispersion treatment.
First, 355.99 g (100 parts by weight) of pigment was added to the obtained dispersant dispersion 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. A mixture of Pigment Red 254 and a pigment derivative represented by the formula (3): 25.85 g; I. A mixture of Pigment Red 177 and the pigment derivative represented by the formula (2): 7.60 g, and a sulfonated pigment derivative powder having a chemical structure represented by the formula (4): 3.55 g were used. At this time, the mixture was diluted with diethylene glycol monobutyl ether acetate as a liquid medium so that the pigment content in the mixture of the dispersant dispersion and the pigment was 16 wt%.

Next, inorganic beads having an average particle size 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), and then inorganic beads having a mean particle diameter of 0.1 mm (second Inorganic beads, made of 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. Moreover, at this time, it diluted with the diethylene glycol monobutyl ether acetate as a liquid medium so that the content rate of the pigment in the obtained pigment dispersion might be 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 pigment dispersion obtained as described above, the polymer solution A1, the polymer solution B1, and the polymer solution C1 were mixed. In this step, the pigment dispersion, the polymer solution A1, the polymer solution B1, the polymer solution C1, diethylene glycol monobutyl ether acetate, and polyethylene glycol monomethyl ether (trade name: “High” Mole PM ", weight average molecular weight: 220, average degree of polymerization: 4, boiling point: 290-310), polyethylene glycol # 300 (weight average molecular weight: 300) as a polyhydric alcohol, and LHP as an acrylic surfactant -95 (manufactured by Enomoto Kasei Co., Ltd.) was charged into a stirrer (uniaxial mixer) with an internal capacity of 400 cc and stirred 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, a target red color filter ink (R ink) was obtained. The pigment content of the R ink at this time 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 the chemical structure represented by the above formula (4) 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%.
(Ink set 2 to 10)
A color filter ink (ink set) was prepared in the same manner as the ink set 1 except that the type and content of the color filter ink were changed as shown in Tables 2 and 3.

  Tables 2 and 3 collectively show the types and contents of the components of the color filter ink in each of the ink sets. In the table, C.I. I. Pigment Red 254 is "PR254", C.I. I. Pigment Red 177 is “PR177”, C.I. I. Pigment Red 254 and a pigment derivative represented by the formula (3) “PR254D”, C.I. I. Pigment Red 177 and a pigment derivative represented by the formula (2) “PR177D”, 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 “PY150”, the powder composed of the pigment derivative represented by the formula (4) is “SPD”, Dispersic 111 (acid value: 50 KOH mg / g) is “DA1”, Dispersic 166 (amine value) : 115 KOHmg / g) “DA4”, SPCN-17X “DR1”, polyethylene glycol # 300 (average weight molecular weight: 300, viscosity: 70 mPa · s) “PEG1”, polyethylene glycol # 200 (average weight molecular weight: 200) , Viscosity: 50 mPa · s) “PEG2”, polyethylene glycol # 400 (average weight molecular weight: 400, viscosity: 90 mPa · s) “PEG3”, polyethylene glycol # 600 (average weight molecular weight: 600, viscosity: 135 mPa · s) ) "PEG4", polypropylene glycol 400 (molecular weight: 400, viscosity: 70 mPa · s) as “PPG1”, polypropylene glycol # 1000 (average weight molecular weight: 1000, viscosity: 150 mPa · s) as “PPG2”, acrylic surfactant (LHP-95, Enomoto) Kasei Chemical Co., Ltd.) “LHP95”, vinyl surfactant (LHP-90, Enomoto Kasei Co., Ltd.) “LHP90”, fluorosurfactant (Megafac F482, Dainippon Ink & Chemicals, Inc.) )) "MF482", silicon surfactant (BYK-307, manufactured by Big Chemie) "BYK307", silicon surfactant (KP-321, manufactured by Shin-Etsu Chemical Co., Ltd.) "KP321" ". 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.

In the table, the type of solvent (liquid medium) indicates various solvents (liquid medium) in the same manner as in Table 1. Furthermore, polyethylene glycol monomethyl ether (manufactured by Toho Chemical Industry Co., Ltd., trade name: “HIGH” Mole PM ”, weight average molecular weight: 220, average degree of polymerization: 4, boiling point: 290 to 310) are indicated by“ S6 ”. In the column of the curable resin material in the table, the polymer contained in the polymer solution A1 is indicated by A1. Similarly, the polymers contained in the polymer solutions A2 to A8, B1 to B6, C1 to C5, and X1 are indicated by A2 to A8, B1 to B6, C1 to C5, and X1, respectively.
In addition, C. used in each Example and each comparative example. I. The content ratio of the pigment derivative represented by the formula (2) in the mixture of Pigment Red 177 and the pigment derivative represented by the formula (2) 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 (3) in the mixture of Pigment Red 254 and the pigment derivative represented by the formula (3) was 0.1 to 10 wt%.

[3] Evaluation of color filter ink [3.1] Evaluation of droplet discharge stability of color filter ink set (stable discharge evaluation)
Using each of the color filter ink sets, an evaluation by the following test was performed.

5 to FIG. 8 installed in a chamber (thermal chamber) and the inks of the above examples and comparative examples were prepared, and the driving waveform of the piezoelectric element was optimized 25 Under the environment of 55 ° C. and 55% RH, 100000 droplets (100,000 droplets) were continuously discharged from each nozzle of the droplet discharge head for each ink. 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.
A: The value of ΔW / _{W T} is less than 0.023.
B: The value of ΔW / _{W T} is less than 0.023 than 0.430.
C: The value of ΔW / _{W T} is less than 0.430 than 0.770.
D: The value of ΔW / _{W T} is 0.770 or more.

[3.2] Measurement of thixo index For each color filter ink, using an E-type viscometer, after setting the color filter ink to 25 ° C., the E-type viscosity (η _{6 under} the conditions of rotation speed: 6 rpm, 60 rpm) [MPa · s], η ₆₀ [mPa · s]) were measured. The thixo index (η ₆ / η ₆₀ ) of the color filter ink was determined from the obtained E-type viscosity.
The results are shown in Tables 1 and 2.

[4] Production of color filter (Example 1)
Using the ink set 1 obtained as described above, a color filter was produced as follows.
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, irradiation with radiation is performed through a photomask to perform post-exposure baking (PEB), followed by development using an alkaline developer, and further by performing post-baking, thereby separating the partition walls. Formed. 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 height of the formed partition wall (cell) was 2.1 μm. The length of the cell in the short side direction is 150 μm, and the length in the long side direction. It was 460 μm.

Next, using a droplet discharge device as shown in FIGS. 5 to 8, the droplet discharge head is moved relative to the substrate in the short side direction of the cell in the cell as the region surrounded by the partition walls. Ink was discharged while moving. At this time, three colored inks were used. In each cell, the color filter ink was applied in such an amount that the average thickness of the colored portion to be formed was 2.0 μm.
Thereafter, heat treatment is performed on a hot plate at 60 ° C. for 30 minutes, and further heat treatment is performed in an oven at 200 ° C. for 1 hour, so that three colors (red (R), green (G), blue (B )) Colored portion was formed. Thereby, a color filter as shown in FIGS. 1 to 3 was obtained.

(Examples 2 to 9, comparative example)
A color filter was produced in the same manner as in Example 1 except that the ink set was changed to those shown in Tables 4 and 5.
About the color filter of each Example and Comparative Example obtained as described above, 100 colored portions were randomly selected for each color, and the thickness of each colored portion was measured with a surface roughness measuring machine (KLA- Measurement was performed using a product of Tencor, trade name: P-15). Next, from the measurement results, T _min / T _max (t), TA _min / TA _max (a), and TB _min / TB _max in the effective area of each colored portion as described above were obtained. Note that TA _min / TA _max (a) and TB _min / TB _max (b) are the smallest values among these values that can be measured in the colored portion. And in 100 colored parts, the ratio of the colored part that satisfies the formula (I), the formula (II), and the formula (III), and the colored part that simultaneously satisfies the formula (I) and the formula (II) The ratio (a + t) and the ratio (b + t) of the colored portion that simultaneously satisfies the formula (I) and the formula (III) were obtained. Further, the measured colored portion: about _{100, T min / T max, TA} min / TA max, to obtain an average of _{TB min} / _{TB max.}
These results are shown in Tables 4 and 5 together with the types of ink sets used in each Example and Comparative Example.

[5] Evaluation of color filters The following evaluations were performed using the color filters of Examples and Comparative Examples obtained as described above.
[5.1] Color Unevenness and Density Unevenness Using the color filters of the respective examples and comparative examples, a liquid crystal display device as shown in FIG. 9 was manufactured under the same conditions.

Using these liquid crystal display devices, visual observation is performed in a dark room with red single color display, green single color display, blue single color display, and white single color display, and color unevenness and density at each part. The occurrence of unevenness 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 remarkably recognized.

[5.2] Evaluation of contrast ratio The liquid crystal display devices of Examples and Comparative Examples manufactured in [5.1] were evaluated as shown below. Using a liquid crystal display device, a single color display of red, a single color display of green, and a single color display of blue are performed. A contrast tester (manufactured by Aisaka Electric Co., Ltd., CT-1, using a halogen lamp attached as a light source) is used to light The contrast ratio (CR) compared with the case where display was not performed was obtained and evaluated as follows.

In the case of red single color display, evaluation was performed according to the following three-stage criteria.
A: CR is 3500 or more.
B: CR is 2800 or more and less than 3500.
C: CR is less than 2800.

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

In the case of blue single color display, evaluation was performed according to the following three-stage criteria.
A: CR is 3500 or more.
B: CR is 3300 or more and less than 3500.
C: CR is less than 3300.

[5.3] Evaluation of lightness The liquid crystal display devices of the above Examples and Comparative Examples manufactured in [5.1] were evaluated as shown below. The liquid crystal display device performs red single color display, green single color display, and blue single color display, and a chromaticity meter (manufactured by Minolta, CM-3700d, using a C light source as a light source) and three by the xyY color system. Stimulus values were determined, and the average of the Y values of the three colors of red light, green light, and blue light was defined as the brightness Y of white light, and evaluated according to the following five-stage criteria.

A: Brightness Y is 29.0 or more.
B: Brightness Y is 28.3 or more and less than 29.0.
C: Brightness Y is 27.7 or more and less than 28.3.
D: Brightness Y is 27.0 or more and less than 27.7.
E: Lightness Y is less than 27.0.
In each of the above evaluations, each color filter was observed and measured under the same conditions.
The results are shown in Tables 4 and 5.

As is clear from Tables 4 and 5, the color filter of each example had a flat colored portion of the color filter and was excellent in brightness and contrast ratio. Further, in the color filter of each example, the occurrence of uneven color, uneven density, and light leakage was suppressed. On the other hand, in the 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 a top view which shows suitable embodiment of the color filter of this invention. It is sectional drawing in the short side direction of the coloring part of the color filter shown in FIG. FIG. 2 is a plan view (a) of a part of the color filter of FIG. 1 enlarged, a sectional view (b) in the short side direction and a sectional view (c) in the long side direction of the enlarged part. 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. 5 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. 6A and 6B are diagrams showing a droplet discharge head in the droplet discharge apparatus shown in FIG. 5, in which FIG. 5A is a sectional perspective view, and FIG. 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 ... Coloring part 12A ... 1st coloring part 12B ... 2nd coloring part 12C ... 3rd coloring part 13 ... Partition 14 ... Cell 15 ... Pixel 16 ... Effective area 2 ... For color filters Ink 3... Coating film 60. Liquid crystal display device 61. Common electrode 62. DESCRIPTION OF SYMBOLS 102 ... Discharge scanning part 103 ... Droplet discharge means 104 ... 1st position control apparatus 105 ... Carriage 106 ... Stage 108 ... 2nd position control apparatus 110 ... Tube 112 ... Control means 114 ... Droplet discharge head (inkjet head) 116A, 116B ... Nozzle row 118 ... Nozzle 120 ... Cavity 122 ... Bulkhead 124 ... Vibrator 12 4A, 124B ... Electrode 124C ... Piezo element 126 ... Vibration plate 127 ... Discharge part 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 1200 ... cellular phone 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 ... Input / output terminal for data communication 1430 ... TV monitor 1440 ... Personal computer

Claims (15)

A color filter having a plurality of colored portions provided on a substrate by a droplet discharge method using a color filter ink comprising a colorant and a liquid medium in which the colorant is dissolved or dispersed,
When the color filter is viewed in plan, the effective area of the colored part is similar to the colored part, the similarity ratio to the colored part is 0.90, and the center of gravity is at the same point as the colored part Then, a color filter that is provided with a colored portion that satisfies the relationship of the following formula (I):
0.80 ≦ T _min / T _max ≦ 1.00 (I)
(However, T _min [μm] is the minimum value of the thickness in the effective region, and T _max [μm] is the maximum value of the thickness in the effective region.) In a plan view of the color filter, each of the plurality of colored portions has a rectangular shape,
The color filter according to claim 1, wherein a colored portion that satisfies a relationship of the following formula (II) is provided when an arbitrary cross section A perpendicular to the substrate in the short side direction of the rectangle is observed.
0.85 ≦ TA _min / TA _max ≦ 1.00 (II)
(However, TA _min [μm] is the minimum value of the thickness of the colored portion in the effective area of the cross section A, and TA _max [μm] is in the effective area of the cross section A. And the maximum thickness of the colored portion.) In a plan view of the color filter, each of the plurality of colored portions has a rectangular shape,
The color filter according to claim 1, wherein a colored portion that satisfies a relationship of the following formula (III) is provided when an arbitrary cross section B perpendicular to the substrate in the long side direction of the rectangle is observed.
0.90 ≦ TB _min / TB _max ≦ 1.00 (III)
(However, TB _min [μm] is the minimum value of the thickness of the colored portion in the effective area of the cross section B, and TB _max [μm] is in the effective area of the cross section B. And the maximum thickness of the colored portion.)   The color filter according to claim 1, wherein an average thickness of the colored portion is 1.0 to 2.5 μm. The plurality of colored portions are composed of colored portions of a plurality of colors, and include at least a green colored portion,
The color filter according to claim 1, wherein the green colored portion that satisfies the formula (I) is provided. The color filter ink includes a resin material,
6. The color filter according to claim 1, wherein the resin material includes a polymer A containing at least an epoxy group-containing vinyl monomer a1 as a monomer component.   The polymer A contains, as a monomer component, a vinyl monomer a2 having an isocyanate group or a blocked isocyanate group in which it is protected with a protective group, in addition to the epoxy group-containing vinyl monomer a1. The color filter according to claim 6, which is a copolymer. The color filter ink includes a resin material,
8. The resin material according to claim 1, wherein the resin material includes a polymer B containing at least an alkoxysilyl group-containing vinyl monomer represented by the following formula (1) as a monomer component. Color filter.

  The color filter according to any one of claims 1 to 8, wherein the color filter ink includes a flattening agent that flattens the formed colored portion when the colored portion is formed.   The color filter according to claim 9, wherein the leveling agent contains a polyhydric alcohol.   The color filter according to claim 10, wherein the polyhydric alcohol is an oligomer of glycols. The polyhydric alcohol is a liquid in an atmosphere of 25 ° C. and 1 atm,
The color filter according to claim 10 or 11, wherein the polyhydric alcohol has a viscosity of 40 to 400 mPa · s at 25 ° C.   An image display device comprising the color filter according to claim 1.   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.

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