JP2010107814A - Color filter, image display device and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color filter which is manufactured by using an inkjet method and which is excellent in lightness and a contrast ratio, and on which occurrence of light transmitting streak is suppressed, and to provide an image display device and electronic equipment equipped with the color filter. <P>SOLUTION: The color filter has a plurality of colored portions with a plurality of colors on a substrate, wherein the colored portions are provided with a droplet discharge method using a color filter ink. 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, having the gravity center at the same point as that of the colored portion, and existing in the colored portion, and T<SB>min</SB>[μm] represents the minimum thickness of the colored portion in the effective area, and T<SB>max</SB>[μm] represents the maximum thickness, an average of T<SB>min</SB>/T<SB>max</SB>of respective colored portions of those with at least one color is 0.85-1.00, and the ink for the color filter includes a coloring agent, a liquid medium, and a predetermined polymer. <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 a color filter rises but it is not preferable also from a 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, as described above, the color filter manufacturing method using the ink jet method is excellent in productivity. However, a color filter manufactured using an inkjet head has a plurality of colored stripes (hereinafter simply referred to as “transmission stripes”) that transmit light with different brightness and color when transmitting light. There is also a problem that is likely to occur. Moreover, the color filter manufactured using the inkjet head has a problem that the brightness and contrast ratio are inferior to those of the color filter manufactured by the photolithography method.

JP 2004-2815 A

  An object of the present invention is to provide a color filter that is manufactured using an inkjet method, has excellent brightness and contrast ratio, and suppresses transmission streaks, and an image display device including the color filter, To provide electronic equipment.

これにより、インクジェット法を用いて製造され、明度およびコントラスト比に優れ、かつ、透過すじの発生が抑制されたカラーフィルターを提供することができる。 Such an object is achieved by the present invention described below.
The color filter of the present invention is a color filter in which a plurality of colored portions of a plurality of colors are provided on a substrate by a droplet discharge method using a color filter ink,
When the color filter is viewed in plan, a region in the colored portion that is similar to the colored portion, has a similarity ratio of 0.90 to the colored portion, and has a center of gravity at the same point as the colored portion. When the effective area is defined, and the minimum value of the thickness of the colored portion in the effective area is T _min [μm] and the maximum value of the thickness is T _max [μm], the colored portion of at least one color in the color filter The average value for T _min / T _max of each colored portion is 0.85 to 1.00,
The color filter ink includes a colorant, a liquid medium in which the colorant is dissolved or dispersed, a monomer component w1 represented by the following formula (1), and a single amount represented by the following formula (2). A polymer W comprising a body component w2, a monomer component w3 represented by the following formula (3), and a monomer component w4 represented by the following formula (4); It includes at least one of a polymer component Z including a monomer component z1, a monomer component z2 represented by the following formula (6), and a monomer component z3 represented by the following formula (7). It is characterized by being.

Thereby, it is possible to provide a color filter that is manufactured using an ink jet method, has excellent brightness and contrast ratio, and suppresses generation of transmission lines.

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 the cross section A perpendicular to the substrate in the short side direction of the rectangle and passing through the center of gravity of the effective area is observed, the minimum value of the thickness in the effective area of the cross section A is TA _min [μm], the cross section When the maximum value of the thickness in the effective area of A is TA _max [μm], the average value of TA _min / TA _max of each colored portion is about 0. It is preferable that it is 88-1.00.
As a result, the brightness and contrast ratio of the color filter are particularly excellent, and transmission streaks are more reliably suppressed.

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,
The rectangle observing a cross section B that passes through the center of gravity of the substrate and the vertical and the effective area of the longitudinal direction of the cross-section wherein the minimum value of the thickness of the effective region TB _{min [μm]} of B, the cross-section When the maximum value of the thickness of B in the effective region is TB _max [μm], the average value of TB _min / TB _max of each colored portion with respect to at least one colored portion of the color filter is 0.92 It is preferable that it is -1.00.
As a result, the brightness and contrast ratio of the color filter are particularly excellent, and transmission streaks are more reliably suppressed.
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 color filter ink contains the polymer W,
The content of the monomer component w1 in the total components constituting the polymer W is 25 to 75 wt%,
The content of the monomer component w2 in the total components constituting the polymer W is 2 to 25 wt%,
The content rate of the monomer component w3 in the total components constituting the polymer W is 5 to 50 wt%,
It is preferable that the content of the monomer component w4 in the total components constituting the polymer W is 3 to 40 wt%.
As a result, the brightness and contrast ratio of the color filter are particularly excellent, and transmission streaks are more reliably suppressed.

In the color filter of the present invention, the color filter ink contains the polymer Z,
The content of the monomer component z1 in the total components constituting the polymer Z is 50 to 95 wt%,
The content of the monomer component z2 in the total components constituting the polymer Z is 3 to 35 wt%,
It is preferable that the content of the monomer component z3 in the total components constituting the polymer Z is 3 to 35 wt%.
As a result, the brightness and contrast ratio of the color filter are particularly excellent, and transmission streaks are more reliably suppressed.
In the color filter according to the aspect of the invention, it is preferable that the color filter ink includes a planarizing agent that planarizes the formed colored portion when the colored portion is formed.
As a result, the brightness and contrast ratio of the color filter are particularly excellent, and transmission streaks are more reliably suppressed.

In the color filter of the present invention, the flattening agent preferably 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 when the colored portion is formed, and the colored portion is particularly flat. As a result, the brightness and contrast ratio of the color filter are particularly excellent, and the generation of transmission lines is more reliably suppressed.
In the color filter of the present invention, the polyhydric alcohol is preferably an oligomer of glycols.
As a result, the brightness and contrast ratio of the color filter are particularly excellent, and transmission streaks are more reliably suppressed.

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.
As a result, the brightness and contrast ratio of the color filter are particularly excellent, and transmission streaks are more reliably suppressed.

これにより、カラーフィルターの明度、コントラスト比はより長期にわたって特に優れたものとなり、透過すじの発生がより確実に抑制される。 In the color filter of the present invention, the color filter ink further includes a monomer component x1 represented by the following formula (8), a monomer component x2 represented by the following formula (9), and the following formula (10). It is preferable that it contains the polymer X containing the monomer component x3 represented by this, and the monomer component x4 represented by following formula (11).

As a result, the brightness and contrast ratio of the color filter are particularly excellent for a longer period, and the generation of transmission lines is more reliably suppressed.

これにより、カラーフィルターの明度、コントラスト比はより長期にわたって特に優れたものとなり、透過すじの発生がより確実に抑制される。 In the color filter of the present invention, the color filter ink further includes a polymer containing a monomer component y1 represented by the following formula (12) and a monomer component y2 represented by the following formula (13). It is preferable that Y is included.

As a result, the brightness and contrast ratio of the color filter are particularly excellent for a longer period, and the generation of transmission lines is more reliably suppressed.

An image display device according to the present invention includes the color filter according to the present invention.
As a result, it is possible to provide an image display device that includes a color filter that suppresses generation of transmission streaks and is excellent in brightness and contrast ratio.
The image display device of the present invention is preferably a liquid crystal panel.
As a result, it is possible to provide an image display device that includes a color filter that suppresses generation of transmission streaks and is excellent in brightness and contrast ratio.
An electronic apparatus according to the present invention includes the image display device according to the present invention.
Accordingly, it is possible to provide an electronic device provided with a color filter that suppresses generation of transmission streaks and is excellent in brightness and contrast ratio.

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

<Coloring part>
As shown in FIG. 1, the colored portion 12 has a rectangular shape in plan view.
Each coloring portion 12 is provided in a cell 14 which is a region surrounded by a partition wall 13 which will be described later.
The first colored portion 12A, the second colored portion 12B, and the third colored portion 12C 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, as described above, the color filter manufactured using the ink jet head is likely to cause transmission lines, and further has a problem that the brightness and contrast ratio are inferior to those of the color filter manufactured by the photolithography method. It was.
In general, the colored portion is formed by applying ink to a plurality of cells formed on the substrate and drying and solidifying the ink by performing a process such as heating the applied ink. In addition, when applying ink into a cell with an inkjet head, the inkjet head is usually moved relative to the substrate along the long side direction or the short side direction of the cell 14. Ink is applied to a plurality of cells. For example, in the case where ink is continuously applied to a plurality of cells along the short side direction of the color filter cell to be manufactured, a plurality of cells in the same column along the short side direction may be included in each cell. Ink is applied around the portion of the inkjet head through which the nozzles pass. In a plurality of rows along the short side direction, the positions where the nozzles of the inkjet head pass through the cells in each row may be different for each row.

  From the facts as described above, the present inventors have the possibility that the colored portion to be formed has a different shape (unevenness) for each column due to different locations where ink is applied in the cells for each column. I found it. In addition, when the colored portion has a different shape for each row, it is assumed that transmission streaks are likely to occur, and as a result of intensive studies, a color filter is manufactured and formed using a color filter ink having a predetermined composition. The present inventors have found that the above-mentioned problem can be solved by satisfying a predetermined relationship with respect to the shape of the colored portion, particularly the thickness of the colored portion.

Hereinafter, the shape of the colored portion found by the present inventor will be described in detail. 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, the region O′P′Q′R ′ is defined as the effective region 16, the minimum thickness of the colored portion 12 in the effective region 16 is T _min [μm], and the maximum thickness is T _max [ [mu] m], the average value of T _min / T _max of each colored portion 12 between the colored portions 12 of at least one color in the color filter 1 is 0.85 to 1.00.

Thus, when the average value of T _min / T _max for the colored portion 12 of at least one color in the color filter 1 is sufficiently large, each colored portion 12 of the color has less unevenness, It will be flat. As a result, the color filter 1 is suppressed in the generation of transmission lines, and has excellent brightness and contrast ratio. This is considered as follows.

  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. In such a case, considering the colored portion 12 of the same color in the color filter 1, the amount of light transmitted through the colored portion 12 is the amount of light transmitted when the colored portion 12 is assumed to be ideally flat. (That is, the maximum amount of light that can pass through the colored portion 12). For this reason, if the amount of light irradiated to each colored portion 12 of the same color is uniform among the colored portions 12, the amount of light transmitted between the colored portions 12 of the same color is also uniform. As a result of the above, it is considered that the generation of transmission streaks is suppressed by the uniform amount of light transmission between the colored portions 12 of the same color. Further, since the amount of light transmitted through the colored portion 12 increases, the color filter 1 provided with such a colored portion 12 is considered to be excellent in brightness and contrast ratio.

And the coloring part 12 which has the above relationships can be formed using the color filter ink which is mentioned later.
On the other hand, when the average value about _Tmin / _Tmax is less than the lower limit, the colored portion has a lot of unevenness and does not become flat. For this reason, the amount of light transmitted through the colored portion is small, and for the reasons described above, the generation of transmission lines cannot be suppressed, and the brightness and contrast ratio of the color filter are not excellent.

Further, regarding the amount of light transmitted through the colored portion 12, it is considered that the behavior of light transmitted through the effective region 16 near the center of the colored portion 12 is important. Attention was paid to the relationship between the thicknesses of the colored portions 12 within the effective region 16. Note that 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 the range as mentioned above about the average value of _Tmin / _Tmax . In general, the green colored portion formed by the ink jet method is likely to be uneven, and therefore, transmission lines are likely to occur, and the brightness and contrast ratio tend to be low. However, by providing the green colored portion 12B that satisfies the above-described range with respect to the average value of T _min / T _max , the color filter 1 can sufficiently suppress the occurrence of transmission streaks, brightness and The contrast ratio is excellent.
The average value of T _min / T _max as described above may be any value as long as it satisfies the range as described above, but is preferably 0.90 to 1.00, more preferably 0.93 to 1 0.00 is more preferable, and the effects as described above can be obtained more remarkably.

The color filter 1 may be satisfied a relation of the average value of _T min _{/ T max} as described above for at least one color, but for the colored portions 12 of a plurality of colors, respectively, as described above _{T min} / T It is preferable to satisfy the relationship of the average value of _max , and it is more preferable to satisfy the relationship of the average value of T _min / T _max as described above for each of the colored portions 12 of all colors. The effect can be obtained more remarkably.

Further, in the color filter 1, the standard deviation of T _min / T _max of each colored portion 12 between the colored portions 12 of at least one color is preferably 0.06 or less, and is 0.03 or less. It is more preferable. Thereby, the transmission amount of light between the colored portions of the color becomes more uniform, and the generation of transmission streaks is more reliably suppressed.
Moreover, it is preferable that the relationship of the standard deviation about _Tmin / _Tmax of each said coloring part 12 is satisfy | filled respectively about the colored parts 12 of several colors, and is satisfied respectively between the colored parts 12 of all the colors. It is more preferable. Thereby, generation | occurrence | production of a transmission streak is suppressed more reliably.

3B shows a cross section A that is perpendicular to the substrate 11 in the short side direction of the colored portion 12 of FIG. 3A and passes through the center of gravity of the effective region 16. 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 such a cross section A is observed, the minimum value of the thickness in the effective area 16 of the cross section A is TA _min [μm], and the maximum value of the thickness in the effective area 16 of the cross section A is TA. _{When max} [μm] is set, the average value of TA _min / TA _max of each colored portion 12 for the colored portion 12 of at least one color in the color filter is preferably 0.88 to 1.00, 0 More preferably, it is .90 to 1.00, and further preferably 0.93 to 1.00. Thereby, the light which permeate | transmits the coloring part 12 of the said color is prevented from unintentional scattering effectively, As a result, the quantity of the light which permeate | transmits the coloring part 12 further increases. For this reason, the color filter 1 is more excellent in brightness and contrast ratio because transmission lines are more reliably suppressed.
Moreover, it is preferable that the color filter 1 satisfies the relationship of the average value of TA _min / TA _max as described above for the colored portions 12 of the plurality of colors, and the colored portions 12 of all colors are described above. It is more preferable to satisfy the relationship of the average value of TA _min / TA _max as described above, and the effects as described above can be obtained more remarkably.

Further, in the color filter 1, the standard deviation of TA _min / TA _max of each colored portion 12 between the colored portions 12 of at least one color is preferably 0.05 or less, and 0.03 or less. It is more preferable. Thereby, the transmission amount of light between the colored portions of the color becomes more uniform, and the generation of transmission streaks is more reliably suppressed.
The relationship between the standard deviation for TA _{min /} TA _max of the colored portion 12 described above, for between colored portions 12 of the plurality of colors, to satisfy each preferably satisfy respectively for between colored portions 12 of all colors It is more preferable. Thereby, generation | occurrence | production of a transmission streak is suppressed more reliably.

3C shows a cross section B that is perpendicular to the substrate 11 in the long-side direction of the colored portion 12 in FIG. 3A and passes through the center of gravity of the effective region 16. The cross section B 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 such a cross section B is observed, the minimum value of the thickness in the effective region 16 of the cross section B is TB _min [μm], and the maximum value of the thickness of the cross section B in the effective region 16 is TB. _{When max} [μm] is set, the average value of TB _min / TB _max of each colored portion 12 for the colored portion 12 of at least one color in the color filter is preferably 0.92 to 1.00, 0 It is more preferable that it is 0.94-1.00, and it is further more preferable that it is 0.96-1.00. Thereby, the light which permeate | transmits the coloring part 12 of the said color is prevented from unintentional scattering effectively, As a result, the quantity of the light which permeate | transmits the coloring part 12 further increases. For this reason, the color filter 1 is more excellent in brightness and contrast ratio because transmission lines are more reliably suppressed.
Moreover, it is preferable that the color filter 1 satisfies the relationship of the average value of TB _min / TB _max as described above for the colored portions 12 of a plurality of colors, and the colored portions 12 of all colors are respectively described above. It is more preferable to satisfy the relationship of the average value of TB _min / TB _max as described above, and the effects as described above can be obtained more remarkably.

Further, in the color filter 1, the standard deviation of TB _min / TB _max of each colored portion 12 between the colored portions 12 of at least one color is preferably 0.05 or less, and is 0.02 or less. It is more preferable. Thereby, the transmission amount of light between the colored portions of the color becomes more uniform, and the generation of transmission streaks is more reliably suppressed.
The relationship between the standard deviation for TB _{min /} TB _max of the colored portion 12 described above, for between colored portions 12 of the plurality of colors, to satisfy each preferably satisfy respectively for between colored portions 12 of all colors It is more preferable. Thereby, generation | occurrence | production of a transmission streak is suppressed more reliably.

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 formula can be easily satisfied more easily, and the light transmittance of the colored portion 12 is particularly excellent. Become.
In addition, the standard deviation of the thickness of the colored portion 12 between the colored portions 12 of the same color is preferably 1.0 μm or less, more preferably 0.5 μm or less, and 0.2 μm or less. More preferably it is. Thereby, the amount of light transmitted through the plurality of colored portions 12 can be made more uniform, and the generation of transmission lines can be more reliably suppressed.

<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 substantially the same as the film 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, more preferably 0.5 to 3.5 μm, and further preferably 1.5 to 2.0 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 as having a desired shape by a method as described later. Moreover, when the partition 13 has a function as a light-shielding part, it may include a light-absorbing material such as carbon black as a constituent material.
The color filter as described above is manufactured by an ink jet method, and can be manufactured by a color filter ink as described later.

《Color filter ink》
Next, the color filter ink used for producing the color filter of the present invention will be described in detail.
The color filter ink used for producing the color filter of the present invention is an ink used for forming a colored portion of the color filter, and is particularly used for producing a color filter by an ink jet method.
In addition, the color filter ink (hereinafter, also simply referred to as ink) includes at least one of a colorant, a liquid medium in which the colorant is dispersed or dissolved, and a polymer W and a polymer Z described later as a resin material. Is included.

  As described above, generally, the colored portion is formed by removing the liquid medium from the color filter ink applied in the cell and solidifying the color filter ink. In such a case, the solid content concentration of the colorant in the color filter ink in the cell or a resin material as described later increases, and the viscosity of the color filter ink increases as the liquid medium is removed. As the liquid medium is removed, the color filter ink loses its fluidity due to an increase in viscosity and solidifies.

  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 due to volatilization of the liquid medium from the outer surface of the ink in the cell. 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.

The conventional color filter ink has a problem that the viscosity increases at a relatively early stage in which the removal of the liquid medium proceeds and the fluidity is easily lost, and thus solidifies in a shape having irregularities. As a result, when the conventional ink is used, the surface of the colored portion to be formed has many irregularities.
Further, when the ink is solidified and dried, the colorant tends to concentrate locally, and the colorant is difficult to be uniformly distributed in the colored part. In particular, when a pigment is used as the colorant, the pigment particles tend to aggregate when the ink is solidified and dried.

As described above, when the formed colored portion is not flat, or when the colored portion is not uniformly distributed in the colored portion, there is a problem that the brightness and contrast ratio of the color filter are not high.
On the other hand, in the present invention, the color filter ink contains at least one of the polymers W and Z. The polymers W and Z both have a function of uniformly distributing the colorant in the color filter ink and keeping the viscosity of the color filter ink low. In particular, the polymers W and Z are present around the pigment, prevent aggregation of the pigment particles, and maintain excellent pigment dispersion stability.

When the liquid medium is removed from the ink for the color filter, in the state where most of the liquid medium is removed, the volatilization of the liquid medium from the ink surface is reduced, so that convection (Benard cell phenomenon) is suppressed. ing. At this time, the color filter ink used in the present invention maintains the low viscosity by the polymers W and Z, and maintains the fluidity without loss. Therefore, at the time of forming the colored portion, the color filter ink has fluidity and low viscosity while suppressing the convection of the color filter ink. Can lose fluidity and solidify in a flat state. As a result, by using such a color filter ink, a flat colored portion satisfying the above-described relationship can be formed.
Further, in the process of forming the colored portion, the colorant can be uniformly distributed in the color filter ink by the polymers W and Z, and the colorant can be uniformly distributed also in the formed colored portion. . In particular, even under conditions where the liquid medium is removed, the dispersion stability of the pigment particles in the color filter ink is maintained.
As described above, the colored portion formed using such a color filter ink satisfies the relationship as described above, and the colorant is uniformly distributed, and the color filter is excellent in contrast ratio and brightness. It will be a thing.

Hereinafter, the constituent materials of the color filter ink suitably used for producing the color filter of the present invention will be described in detail.
<Colorant>
The color filter usually has different colored portions (generally, three colors corresponding to RGB). The colorant is usually selected according to the color tone of the colored portion to be formed. As a colorant constituting the color filter ink, for example, various pigments and various dyes can be used.

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

When the color filter ink is 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 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 do. As a result, when ink is applied to the cells, the discharge stability of the color filter ink can be made particularly excellent.
C. I. Pigment Red 177 derivatives, C.I. I. When the pigment red 254 derivative contains a compound (derivative) represented by the following formula (14) or the following formula (15), the above-described effects are more remarkably exhibited.

  In particular, the color filter ink is used as a pigment (green pigment). I. When it contains CI Pigment Green 58 (brominated zinc phthalocyanine pigment), the color developability of the color filter ink (green color filter ink) can be made particularly excellent. In addition, C.I. I. Although Pigment Green 58 has a feature of excellent brightness, conventionally, it has been a very difficult material to stably disperse. However, the inventor has disclosed C.I. 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 (16). 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.

  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 further improved. 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 and C.I. I. When the pigment violet 23 is contained, the color developability of the color filter ink (blue color filter ink) can be made particularly excellent. Further, 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; C.I. I. Basic oranges 21, 23 and the like can be mentioned, and one or more selected from these can be used in combination.

  The content of the colorant in the color filter ink is preferably 2 to 25 wt%, and more preferably 3 to 20 wt%. When the content of the colorant is a value within the above range, the discharge property (discharge stability) from the droplet discharge head (inkjet head) for the color filter is particularly excellent, and the produced color filter The durability can be improved. Further, a sufficient color density can be secured in the manufactured color filter.

<Resin material>
The color filter ink generally contains a resin material (binder resin) for the purpose of improving the adhesion of the formed colored portion to the substrate.
The color filter ink is a resin material having a monomer component w1 represented by the following formula (1), a monomer component w2 represented by the following formula (2), and a simple substance represented by the following formula (3). A polymer W containing a monomer component w3 and a monomer component w4 represented by the following formula (4), a monomer component z1 represented by the following formula (5) and the following formula (6). At least one of the polymers Z containing the monomer component z2 and the monomer component z3 represented by the following formula (7) is included.

  As described above, the polymers W and Z both have a function of uniformly distributing the colorant in the color filter ink and keeping the viscosity of the color filter ink low. In particular, the polymers W and Z are present around the pigment, prevent aggregation of the pigment particles, and maintain excellent pigment dispersion stability over a long period of time. For this reason, a flat colored part can be formed for the reasons described above, and the brightness and contrast ratio of the manufactured color filter can be made excellent.

Furthermore, since the polymers W and Z can uniformly distribute (disperse) the colorant (particularly the pigment) in the ink, the ink discharged when the ink is discharged from the discharge portion (nozzle). The uniformity of the amount of the liquid droplets, the landing accuracy of the discharged liquid droplets, etc. (also referred to as ejection stability) can be improved over a long period of time.
Polymers W and Z have an epoxy group and are a curable resin, but the curing reaction is not allowed to proceed substantially at a predetermined temperature or lower, and the curing reaction can be efficiently performed at a temperature higher than that. It has a characteristic (hereinafter also referred to as “curing reaction switching characteristic”). By having such characteristics, it is possible to prevent the polymers W and Z from unintentionally causing a curing reaction during storage of the color filter ink, and the color filter ink has a property such as viscosity over a long period of time. There will be little change. As a result, the discharge stability of the color filter ink is excellent over a long period of time. On the other hand, when the color filter ink is heated to a predetermined temperature or higher, the polymers W and Z quickly undergo a curing reaction, and the color filter ink is cured.

Further, the color filter ink contains the polymers W and Z, so that the color filter ink can be satisfactorily spread on the substrate, and air bubbles can be reliably prevented from being mixed with the substrate. A colored portion having excellent adhesion can be suitably formed.
In addition, the color filter ink contains the polymer W, so that not only the colorant can be uniformly distributed but also the dispersion stability of the dispersant described later can be particularly excellent. As a result, the pigment dispersion stability and the long-term storage stability of the color filter ink can be made particularly excellent.

  In addition to improving the dispersion stability of the pigment as described above, the polymers W and Z have extremely excellent stability against mechanical force. For this reason, when the color filter ink is manufactured using a manufacturing method as described later (in a fine dispersion step described later), the polymers W and Z are preferably used at the time of fine dispersion of the aggregate of pigment particles used as a raw material. Can be used. This will be described later.

Hereinafter, each component of the resin material that can be used in the color filter ink suitably applied to the color filter of the present invention will be described in detail.
[Polymer W]
The polymer W includes a monomer component w1 represented by the above formula (1), a monomer component w2 represented by the above formula (2), and a monomer component w3 represented by the above formula (3). And the monomer component w4 represented by the above formula (4). Examples of the polymer W include those represented by the following formula (17).

The polymer W has the following specific functions by including the polymer W in addition to the common functions by including the polymers Z and W as described above.
First, by including the polymer W, the color filter ink can be made excellent in chemical resistance, solvent resistance, and the like of the colored portion to be formed. For this reason, after the colored portion forming step (curing step), chemical application and washing (especially washing with N-methyl-2-pyrrolidone, γ-butyrolactone, isopropyl alcohol, hydrochloric acid, aqueous sodium hydroxide, etc.), etc. Even when post-processing is performed, the occurrence of adverse effects due to these can be reliably prevented.

  The polymer W may be substantially composed of a single compound, or may be a mixture of a plurality of types of compounds. However, when the polymer W is a mixture of a plurality of types of compounds, each compound contains monomer components w1, w2, w3, and w4.

(Monomer component w1)
The polymer W contains the monomer component w1 represented by the above formula (1) as a monomer component.
By containing such a monomer component w1 as the monomer component, the switching characteristics of the curing reaction of the resin material can be made excellent. Further, by containing the monomer component w1 as a monomer component, the dispersion stability of the pigment particles in the color filter ink can be made particularly excellent, and the long-term storage stability of the color filter ink, The discharge stability can be made particularly excellent. In addition, the monomer component w1 is excellent in reactivity in a high-temperature environment in the polymer W, but has extremely excellent stability against mechanical force. For this reason, even if it is a case where it uses for the fine dispersion process mentioned later with a pigment, modification | denaturation and deterioration of the polymer W in this process are prevented, and the function of the polymer W is reliably demonstrated in the ink for color filters. be able to. Moreover, the hardness etc. of the colored part formed can be made excellent by containing the monomer component w1 as a monomer component.

The content of the monomer component w1 in the polymer W (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 25 to 75 wt%, and 40 to 60 wt%. More preferably. When the content of the monomer component w1 in the polymer W is a value within the above range, the above-described effects can be achieved without inhibiting the functions of the monomer components w2, w3, and w4 described in detail later. It can be expressed more significantly. Moreover, when the polymer W is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component w1 at the content as described above.
Moreover, when the polymer W is a mixture of a plurality of types of compounds, the weighted average value (weighted average value based on the weight ratio) for these compounds is used as the content value of the monomer component w1. can do. Hereinafter, the same applies to the content of each other monomer of the polymer W and the content of each monomer of the polymers Z, X, and Y.

(Monomer component w2)
The polymer W contains the monomer component W2 represented by the above formula (2) as a monomer component.
By containing such a monomer component w2 as a monomer component, it is possible to improve the wetting and spreading of the color filter ink on the substrate, and mixing of bubbles and the like is reliably prevented, A colored portion having excellent adhesion to the substrate can be suitably formed. In addition, when the color filter ink contains a dispersant in addition to the pigment, by including the monomer component w2 as a monomer component, not only the dispersion stability of the pigment but also the dispersion stability of the dispersant. Can also be made particularly excellent. As a result, the pigment dispersion stability and the long-term storage stability of the color filter ink can be made particularly excellent.

The content of the monomer component w2 in the polymer W (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 2 to 25 wt%, and 5 to 15 wt%. More preferably. When the content of the monomer component w2 in the polymer W is a value within the above range, without inhibiting the functions of the monomer component w1 and the monomer components w3 and w4 described in detail later, The effects as described above can be expressed more remarkably.
Moreover, when the polymer W is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component w2 at the content rate described above.

(Monomer component w3)
The polymer W contains the monomer component w3 represented by the above formula (3) as a monomer component.
By containing the monomer component w3 as a monomer component, the chemical resistance, solvent resistance, and the like of the colored portion to be formed can be improved.

Further, the monomer component w3 is colored in the polymer W, while the reactivity at a relatively low temperature (for example, 100 ° C. or less) is sufficiently low, like the monomer component w1 described above. Under a heating environment such as a heat treatment applied in the part forming step (curing step), sufficient reactivity is exhibited. For this reason, in the coloring part formation process (curing process) performed in a heating environment while reliably preventing unintentional reaction (polymerization reaction) of the resin material during storage of the color filter ink or in the ink application process described later. Can suitably advance the curing reaction (polymerization reaction) of the resin material.
Further, by containing the monomer component w3 as the monomer component, for example, the dispersion stability of the pigment particles in the color filter ink can be made excellent, and the long-term storage stability of the color filter ink. The discharge stability can be made excellent.

  The content of the monomer component w3 in the polymer W (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 5 to 50 wt%, and 10 to 40 wt%. More preferably. When the content of the monomer component w3 in the polymer W is a value within the above range, without inhibiting the functions of the monomer components w1, w2 and the monomer component w4 described in detail later, The effects as described above can be expressed more remarkably. Moreover, when the polymer W is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component w3 at the above-described content.

(Monomer component w4)
The polymer W contains the monomer component w4 represented by the above formula (4) as a monomer component.
When the polymer W contains the monomer component w4, when the liquid medium is removed from the color filter ink applied on the substrate at the time of forming the colored portion, the color increases as the solid content concentration increases. It is possible to reliably prevent the viscosity of the filter ink from rising and the occurrence of unintended irregularities on the surface of the formed colored portion.

  Further, by containing the monomer component w4 as a monomer component, the hydrophobicity of the entire resin material can be suitably adjusted, and the affinity and compatibility of each polymer constituting the resin material are particularly good. It can be excellent. As a result, the discharge stability of the color filter ink can be made particularly excellent, and the colored portion formed using the color filter ink has excellent transparency (light due to the opacity of the resin material). The decrease in transmittance is prevented), and the adhesion to the substrate is particularly excellent, and problems such as cracks are less likely to occur.

The content of the monomer component w4 in the polymer W (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 3 to 40 wt%, and 5 to 30 wt%. More preferably. When the content of the monomer component w4 in the polymer W is a value within the above range, the above-described effects are more remarkable without inhibiting the functions of the monomer components w1, w2, and w3. Can be expressed.
Moreover, when the polymer W is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component w4 with the content as described above.

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

The weight average molecular weight of the polymer W is preferably 5000 to 50000, and more preferably 6000 to 15000. As a result, it is possible to make the color filter ink stable over time (long-term storage stability), the discharge stability of the color filter ink, and the color filter productivity sufficiently. Furthermore, the flatness of the colored portion formed using the color filter ink can be made more reliable, and the occurrence of color unevenness or the like in the image displayed using the color filter can be more effectively achieved. Can be prevented.
Moreover, it is preferable that the dispersion degree (weight average molecular weight Mw / number average molecular weight Mn) of the polymer W is 1-3.

[Polymer Z]
The polymer Z includes a monomer component z1 represented by the above formula (5), a monomer component z2 represented by the above formula (6), and a monomer component z3 represented by the above formula (7). Is included. Examples of the polymer Z include those represented by the following formula (18).

The polymer Z has the following specific functions by including the polymer Z in addition to the common functions by including the polymers Z and W as described above.
As described above, the polymer Z is a curable resin, and is a component that contributes to the curing of the resin material in the colored portion forming step (curing step) to be described later. Even if deformation (for example, thermal expansion, thermal contraction, etc.) occurs in the substrate or the like provided with the colored portion, the function of following the deformation and maintaining the adhesion of the colored portion to the substrate or the like. Have. Thereby, for example, even when the manufactured color filter is repeatedly exposed to a rapid temperature change accompanying image display, good adhesion can be maintained, and problems such as light leakage (white spots, bright spots), etc. Can be prevented more reliably. That is, the durability of the color filter is particularly excellent, and excellent brightness and contrast ratio are maintained over a long period of time.
The polymer Z may be substantially composed of a single compound, or may be a mixture of a plurality of types of compounds. However, when the polymer Z is a mixture of a plurality of types of compounds, each compound contains monomer components z1, z2, and z3.

(Monomer component z1)
The polymer Z contains the monomer component z1 represented by the above formula (5) as a monomer component.
By containing such monomer component z1 as a monomer component, unintentional reaction (polymerization reaction) of the resin material during storage of the color filter ink or in the ink application process described later can be prevented more reliably. However, in the colored part forming step (curing step) performed in a heating environment, the curing reaction (polymerization reaction) of the resin material can be more suitably progressed. That is, the switching characteristics of the curing reaction for the resin material can be made particularly excellent. Further, by containing the monomer component z1 as the monomer component, the dispersion stability of the pigment particles in the color filter ink can be made particularly excellent, and the long-term storage stability of the color filter ink, The discharge stability can be made particularly excellent. In addition, the monomer component z1 in the polymer Z is excellent in reactivity under a high temperature environment, but has extremely excellent stability against mechanical force. For this reason, even when it is subjected to the fine dispersion step described later together with the pigment, the modification and deterioration of the polymer Z in this step are prevented, and the function of the polymer Z is reliably exhibited in the color filter ink. be able to. Further, by containing the monomer component z1 as a monomer component, the hardness of the colored portion to be formed can be made particularly excellent.

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

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

(Monomer component z2)
The polymer Z contains the monomer component Z2 represented by the above formula (6) as a monomer component.
By containing such a monomer component z2 as the monomer component, the color filter ink can be spread more favorably on the substrate, and mixing of bubbles and the like can be reliably prevented. A colored portion having excellent adhesion to the substrate can be formed more suitably. In addition, when the color filter ink contains a dispersant in addition to the pigment, by containing the monomer component z2 as a monomer component, not only the dispersion stability of the pigment but also the dispersion stability of the dispersant. Can also be made particularly excellent. As a result, the pigment dispersion stability and the long-term storage stability of the color filter ink can be made particularly excellent.

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

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

(Monomer component z3)
The polymer Z contains the monomer component z3 represented by the formula (7) as a monomer component.
Such a monomer component z3 is a component that contributes to the curing of the resin material in the colored portion forming step (curing step) described later, as with the monomer component w1 and the like described above. While w1 and the like have a function of increasing the hardness of the colored portion to be formed, the monomer component z3 gives an appropriate flexibility to the formed colored portion, and the colored portion is provided. Even when the substrate is deformed (for example, thermal expansion, thermal contraction, etc.), it has a function of following the deformation and maintaining the adhesion of the colored portion to the substrate.

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

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

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

The weight average molecular weight of the polymer Z is preferably 5000 to 50000, and more preferably 6000 to 15000. As a result, it is possible to make the color filter ink stable over time (long-term storage stability), the discharge stability of the color filter ink, and the color filter productivity sufficiently. Furthermore, the flatness of the colored portion formed using the color filter ink can be made more reliable, and the occurrence of color unevenness or the like in the image displayed using the color filter can be more effectively achieved. Can be prevented.
Moreover, it is preferable that the dispersion degree (weight average molecular weight Mw / number average molecular weight Mn) of the polymer Z is 1-3.

As described above, in the present invention, the resin material may further include a resin component (polymer) other than the polymer W and the polymer Z.
Examples of such a resin component (polymer) include polymer X and polymer Y as described below. The polymers X and Y mainly contribute to forming a colored part as a hard thing. When the color filter ink contains the polymers X and Y together with the polymers W and Z, the colored portion to be formed becomes harder and the durability of the manufactured color filter becomes particularly excellent. That is, the brightness and contrast ratio of the color filter are maintained as being excellent for a longer period. Further, the polymers X and Y are excellent in affinity with the polymers W and Z as described above, and even when these are mixed, the viscosity of the color filter ink is low. Further, even when the color filter ink contains a relatively large amount of the polymers X and Y, the viscosity of the color filter ink is maintained as low. For this reason, the color filter ink has excellent droplet ejection stability.

[Polymer X]
Polymer X includes monomer component x1 represented by the following formula (8), monomer component x2 represented by the following formula (9), monomer component x3 represented by the following formula (10), and And a monomer component x4 represented by the following formula (11). Examples of the polymer X include those represented by the following formula (19).

By including such a polymer X, the affinity (affinity as a whole resin material) of each polymer component constituting the resin material contained in the color filter ink can be made particularly excellent. The discharge stability of the color filter ink can be made particularly excellent. Moreover, the transparency of the colored part formed using the color filter ink can be made extremely high. For this reason, it is possible to more reliably prevent the occurrence of color unevenness, density unevenness, contrast reduction, and the like at each part of the color filter manufactured using the color filter ink. In addition, by including the polymer X, the switching property of the curing reaction as a whole resin material is sufficiently excellent, and the solvent resistance of the colored portion formed using the color filter ink is particularly excellent. Can be. For this reason, the durability and reliability of the color filter manufactured using the color filter ink can be made particularly excellent.
In addition, the polymer X may consist essentially of a single compound, or may be a mixture of a plurality of types of compounds. However, when the polymer X is a mixture of a plurality of types of compounds, each compound contains monomer components x1, x2, x3 and x4.

(Monomer component x1)
The polymer X contains the monomer component x1 represented by the above formula (8) as a monomer component.
By containing such a monomer component x1 as a monomer component, an unintentional reaction (polymerization reaction) of the resin material can be reliably prevented during storage of the color filter ink or in the ink application process described later. On the other hand, in the colored part forming step (curing step) performed in a heating environment, the curing reaction (polymerization reaction) of the resin material can be more suitably progressed. That is, by including the monomer component x1, the switching characteristics of the curing reaction for the resin material can be made particularly excellent. Further, by containing the monomer component x1 as the monomer component, for example, the dispersion stability of the pigment particles in the color filter ink can be improved, and the long-term storage stability of the color filter ink. The discharge stability can be made excellent. Moreover, the hardness etc. of the colored part formed can be made excellent by containing the monomer component x1 as a monomer component.

  The content of the monomer component x1 in the polymer X (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 30 to 90 wt%, and 40 to 80 wt%. More preferably. When the content of the monomer component x1 in the polymer X is a value within the above range, the above-described effects can be achieved without inhibiting the functions of the monomer components x2, x3, and x4 described in detail later. It can be expressed more significantly. Moreover, when the polymer X is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component x1 at the content as described above.

(Monomer component x2)
The polymer X contains the monomer component x2 represented by the formula (9) as a monomer component.
By including such a monomer component x2 as a monomer component (in particular, together with the monomer component x1 described above and the monomer component x3 described in detail later), coloring is performed in a heating environment. In the part forming step (curing step), the curing reaction (polymerization reaction) of the resin material can be proceeded more suitably. In particular, in the colored portion forming step (curing step) under a heating environment, the rising of the polymerization reaction of the resin material can be improved, and the polymerization reaction can be continuously advanced. Further, by containing the monomer component x2 as the monomer component, the affinity and compatibility between the polymer Y and the polymer X can be made sufficiently excellent. As a result, the discharge stability of the color filter ink can be made excellent, and the colored portion formed using the color filter ink has excellent transparency (light transmission due to the opacity of the resin material). Rate is prevented), adhesion to the substrate is particularly excellent, and problems such as cracks are less likely to occur. Further, by containing the monomer component x2 as the monomer component, the hardness of the colored portion to be formed can be made particularly excellent.

  The content of the monomer component x2 in the polymer X (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 5 to 60 wt%, and 10 to 50 wt%. More preferably. When the content of the monomer component x2 in the polymer X is a value within the above range, without inhibiting the functions of the monomer component x1 and the monomer components x3 and x4 described in detail later, The effects as described above can be expressed more remarkably. Moreover, when the polymer X is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component x2 at the above-described content.

(Monomer component x3)
The polymer X contains the monomer component x3 represented by the formula (10) as a monomer component.
By containing the monomer component x3 as a monomer component, the chemical resistance, solvent resistance, and the like of the colored portion to be formed can be improved. Thus, after the colored portion forming step (curing step), chemical application and washing (especially washing with N-methyl-2-pyrrolidone, γ-butyrolactone, isopropyl alcohol, hydrochloric acid, aqueous sodium hydroxide, etc.), etc. Even when post-processing is performed, the occurrence of adverse effects due to these can be reliably prevented.

  Further, the monomer component x3 has a sufficiently low reactivity at a relatively low temperature (for example, 100 ° C. or lower) in the polymer X, similarly to the monomer component x1 described above. Under a heating environment such as a heat treatment applied in the forming step (curing step), the substrate exhibits sufficient reactivity. For this reason, in the coloring part formation process (curing process) performed in a heating environment while reliably preventing unintentional reaction (polymerization reaction) of the resin material during storage of the color filter ink or in the ink application process described later. Can suitably advance the curing reaction (polymerization reaction) of the resin material.

  Further, by containing the monomer component x3 as the monomer component, for example, the dispersion stability of the pigment particles in the color filter ink can be made particularly excellent, and the polymer X and others The affinity and compatibility with the polymers W, Z, and Y can be made sufficiently excellent. As a result, the long-term storage stability and ejection stability of the color filter ink can be improved, and the colored portion formed using the color filter ink has excellent transparency (the opaqueness of the resin material). The light transmittance is prevented from lowering due to the property), the adhesion to the substrate is particularly excellent, and problems such as cracks are less likely to occur.

  The content of the monomer component x3 in the polymer X (value obtained by conversion based on the weight of the monomer used for the synthesis of the polymer) is preferably 2 to 20 wt%, and 3 to 15 wt%. More preferably. When the content of the monomer component x3 in the polymer X is a value within the above range, without inhibiting the functions of the monomer components x1 and x2 described above and the monomer component x4 described in detail later, The effects as described above can be expressed more remarkably. Moreover, when the polymer X is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component x3 with the content as described above.

(Monomer component x4)
The polymer X contains the monomer component x4 represented by the formula (11) as a monomer component.
By containing such a monomer component x4 as a monomer component, when the liquid medium is removed from the color filter ink applied on the substrate, the color component for the color filter increases as the solid content concentration increases. It can prevent more reliably that the viscosity of an ink raises.

Moreover, the monomer component x4 has a hydroxyl group at the terminal. By having such a structure, the reaction at a relatively low temperature (for example, 100 ° C. or less) is sufficiently low, and the reaction is performed in a heating environment such as a heat treatment performed in the colored portion forming step (curing step). The sex can be further enhanced. By this, in the colored part forming step (curing step) performed in a heating environment while reliably preventing unintentional reaction (polymerization reaction) of the resin material during storage of the color filter ink or in the ink application step described later Can advance the curing reaction (polymerization reaction) of the resin material more suitably.
Further, by containing the monomer component x4 as the monomer component, for example, the dispersion stability of the pigment particles in the color filter ink can be made particularly excellent, and the color filter ink can be stored for a long time. And discharge stability can be made particularly excellent.

  The content of the monomer component x4 in the polymer X (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 2 to 20 wt%, and 3 to 15 wt%. More preferably. When the content of the monomer component x4 in the polymer X is a value within the above range, the above-described effects are more remarkable without inhibiting the functions of the monomer components x1, x2, and x3. Can be expressed. Moreover, when the polymer X is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component x4 with the content as described above.

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

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

[Polymer Y]
The polymer Y includes a monomer component y1 represented by the following formula (12) and a monomer component y2 represented by the following formula (13). Examples of the polymer Y include those represented by the following formula (20). The polymer Y may be substantially composed of a single compound or a mixture of a plurality of types of compounds. However, when the polymer Y is a mixture of a plurality of types of compounds, each compound contains monomer components y1 and y2.

(Monomer component y1)
The polymer Y contains the monomer component y1 represented by the formula (12) as a monomer component.
By including such a monomer component y1 as the monomer component, the adhesion of the formed colored portion to the substrate can be made particularly excellent. As a result, the durability of the color filter can be made particularly excellent.

Moreover, it can prevent that the reactivity of the monomer component y2 in the polymer Y becomes higher than necessary because the polymer Y contains the monomer component y1. As a result, in the colored portion forming step (curing step) performed in a heating environment while reliably preventing unintentional reaction (polymerization reaction) of the resin material during storage of the color filter ink or in the ink application step described later. Can suitably advance the curing reaction (polymerization reaction) of the resin material. That is, by containing the monomer component y1, the switching characteristics of the curing reaction can be improved.
Moreover, the hardness etc. of the colored part formed can be made excellent by containing the monomer component y1 as a monomer component.

  The content of the monomer component y1 in the polymer Y (value obtained by conversion based on the weight of the monomer used for polymer synthesis) is preferably 30 to 90 wt%, and 40 to 80 wt%. More preferably. When the content of the monomer component y1 in the polymer Y is a value within the above range, the above-described effects are more remarkably exhibited without inhibiting the function of the monomer component y2 described in detail later. Can be made. Moreover, when the polymer Y is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component y1 at the content as described above.

(Monomer component y2)
The polymer Y contains the monomer component y2 represented by the formula (13) as a monomer component.
By including such a monomer component y2 as a monomer component (particularly containing it together with the monomer component y1 described above), in the colored portion forming step (curing step) performed in a heating environment, The curing reaction (polymerization reaction) of the resin material can be suitably proceeded. In particular, in the colored portion forming step (curing step) under a heating environment, the rising of the polymerization reaction of the resin material can be made favorable, and the polymer W described in detail later is suitably involved in the curing reaction. The polymerization reaction can be continued continuously. Moreover, the hardness etc. of the colored part formed can be made excellent by containing the monomer component y2 as a monomer component.

  In addition, when the polymer Y contains the monomer component y2, the affinity and compatibility with the polymer W described in detail later can be sufficiently improved. As a result, the discharge stability of the color filter ink can be made excellent, and the colored portion formed using the color filter ink has excellent transparency (light transmission due to the opacity of the resin material). Rate is prevented), adhesion to the substrate is particularly excellent, and problems such as cracks are less likely to occur.

  The content of the monomer component y2 in the polymer Y (value obtained by conversion in terms of the weight of the monomer used for polymer synthesis) is preferably 10 to 70 wt%, and is 20 to 60 wt%. More preferably. When the content of the monomer component y2 in the polymer Y is a value within the above range, the above-described effects can be expressed more significantly without inhibiting the function of the monomer component y1 described above. Can do. Moreover, when the polymer Y is a mixture of a plurality of types of compounds, it is preferable that all of these compounds contain the monomer component y2 with the content as described above.

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

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

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

In addition, the content of the resin material in the color filter ink is preferably 0.5 to 18 wt%, more preferably 1 to 15 wt%, and further preferably 3 to 10 wt%.
When the content of the resin material in the color filter ink is C _R [wt%] and the content of the pigment in the color filter ink is C _P [wt%], 0.2 ≦ C _R / C _It is preferable to satisfy the relationship of _P ≦ 9.0, more preferably satisfy the relationship of 0.3 ≦ _CR / _CP ≦ 5.0, and 0.4 ≦ _CR / _CP ≦ 3.5. It is more preferable to satisfy this relationship. By satisfying such a relationship, it is possible to sufficiently increase the coloring density of the colored portion while sufficiently flattening the colored portion of the produced color filter.
The resin material constituting the color filter ink includes a polymer other than those described above (for example, a thermoplastic polymer or a curable polymer other than the above-described polymers W, Z, X, and Y). It may be.

<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 above-mentioned relationship more easily and reliably.
The leveling agent that can be used in the color filter ink is not particularly limited as long as it has a function of leveling the colored portion during the production of the color filter, and examples thereof include polyhydric alcohols and leveling agents.

[Polyhydric alcohol]
The polyhydric alcohol has a function of reducing the thixotropic property of the color filter ink when forming the colored portion.
As described above, when removing the liquid medium from the color filter ink applied in the cell, the solid content concentration of the colorant or the resin material in the color filter ink in the cell is increased. The viscosity of the color filter ink tends to increase with the removal of the liquid medium. Since the color filter ink of the present embodiment contains at least one of the polymers W and Z as described above, the increase in viscosity in such a situation is relatively suppressed. Further, when the color filter ink contains a polyhydric alcohol, an increase in thixotropic property of the color filter ink is also suppressed. Therefore, the color filter ink can maintain fluidity for a longer period in the process of removing and solidifying such a liquid medium, and is sufficient even when the majority of the liquid medium is removed and convection is suppressed. Fluidity is maintained. As a result, the color filter ink is solidified in a flat state, the formed colored portion is flatter, and the thickness relationship as described above can be satisfied more reliably.

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.
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. 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.

Moreover, when using the oligomer of glycols as a polyhydric alcohol, it is preferable that the terminal hydroxyl group is not substituted. Thereby, the thixotropic property of the ink can be further reduced. In addition, the affinity for the color filter ink to a substrate (especially a glass substrate), which will be described later, is excellent, and the color filter ink can be suitably spread in the cell, and more easily as described above. It is possible to form a colored portion that satisfies this relationship.
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 reduced.

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 reduced.
The polyhydric alcohol is preferably a liquid in an atmosphere of 25 ° C. and 1 atm. As described above, since the polyhydric alcohol is 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 way, convection in the cell is suppressed in the color filter ink in the cell when the colored portion is formed.

  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 for the color filter ink at 25 ° C. under the condition of 6 rpm is η ₆ [mPa · s], and the viscosity of the 25 ° C. color filter ink measured under the condition of 60 rpm is η _{When 60} [mPa · s] is set, 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.

[Leveling agent]
The leveling agent has a function of flattening the colored portion by reducing the surface tension of the ink. More specifically, when the leveling agent is contained in the color filter ink, the leveling agent concentrates on the outermost layer of the color filter ink applied in the cell. The leveling agent that collects on the outermost layer of the color filter ink reduces the surface tension of 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 formula as described above more reliably. Further, since the ink has a leveling agent, it can act synergistically with the effects of the polymers W and Z that maintain fluidity with low viscosity over a long period of time.

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

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

<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. The liquid medium also functions as a solvent for dissolving the resin material.

  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 (eg, methyl esters), [3] ethers, esters, etc. of compounds having at least one hydroxyl group and at least one carboxyl group in the molecule (hydroxy acid), [4] 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, the liquid medium includes 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 a colorant, a resin material, or the like is included in the ink, the change in the physical properties of the ink is relatively small. In addition, when a pigment is contained in the color filter ink, the long-term dispersion stability of the pigment can be sufficiently excellent even when the pigment content is increased, and at the time of forming the colored portion 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 that of the resin material as described above and a dispersant as described later, dispersion stability of colorant such as ink pigment (uniformity in ink). Is high and the viscosity change is small over a long period of time. In addition, it is possible to prevent deterioration, aggregation, and the like of components such as colorants and resin materials. 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 polyhydric alcohol has a glycol skeleton, particularly when it is an oligomer of ethylene glycol, the polyhydric alcohol can sufficiently reduce the thixotropic property of the ink. This is presumably because the polyhydric alcohol 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. Further, since the ink is difficult to dry, deterioration, aggregation, and segregation of components such as a colorant and a resin material 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 the resin material or dispersant as described above, so that the dispersion stability of the ink is high and the ink is stable for a long time. Thus, the viscosity change is small. Moreover, the solubility of water in the liquid medium can be made appropriate. 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 preferable that the viscosity at 25 degrees C of a liquid medium is 0.5-20 mPa * s, and 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 viscosity of the liquid medium can be measured using, for example, an E-type viscometer (for example, RE-01 manufactured by Toki Sangyo Co., Ltd.), and in particular, can be performed according to JIS Z8803.

  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.

  Further, 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. Further, a sufficient color density can be ensured in the produced color filter.

<Dispersant>
The color filter ink may contain a dispersant. Thereby, when a pigment is contained as the colorant, the dispersibility of the pigment particles in the color filter ink can be improved, and the discharge stability of the ink droplets can be made particularly excellent. In particular, when the polymer W or polymer Z and the dispersant are used in combination, these effects work synergistically, the dispersion stability of the pigment in the color filter ink, and the ejection stability of the color filter ink. Etc. can be made particularly excellent.

Examples of the dispersant include cationic, anionic, nonionic, amphoteric, silicone, and fluorine surfactants.
More specific examples of the dispersant include, for example, Dispersic 101, Dispersic 102, Dispersic 103, Dispersic P104, Dispersic P104S, Dispersic 220S, Dispersic 106, Dispersic 108, Dispersic 109, Disperse BIC 110, 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, EFKA 44 3, 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 33500, Sol Sparse 33500 Perth 35100, Solsperse 35200, Solsperse 36000, Solsperse 36600, Solsperse 38500, Solsperse 41000, Solsperse 41090, Solsperse 20000 (above, manufactured by Lubrizol Corporation); Manufactured by 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.); DOPA-14, Floren DOPA-15B, Floren DOPA-17, Floren DOPA-22, Floren DOPA-44, Floren TG-710, Floren D-90 (above, manufactured by Kyoei Chemical Co., Ltd.), Anti-Terra-205 (Big Chemie) Hinoact KF-1000, KF-1525, Hinoact 1300M, Hinoact T9050, Hinoact T6000, Hinoact T7000, Hinoact T8000, Hinoact T8000E (above, manufactured by Kawaken Fine Chemical Co., Ltd.), etc. Alternatively, two or more kinds can be used in combination.

  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 amine value (hereinafter also referred to as an amine value dispersant). It is preferable that it contains. 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. As a result, the pigment dispersion stability in the color filter ink and the discharge stability of the color filter ink droplets can be made particularly excellent.

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

Specific examples of the amine value dispersant include Dispersic 102, Dispersic 160, Dispersic 161, Dispersic 162, Dispersic 163, Dispersic 164, Dispersic 166, Dispersic 167, Dispersic 168, Dispersic 2150, Dispersic LPN6919, Dispersic 9075, Dispersic 9077 (above, manufactured by BYK Chemie); EFKA 4015, EFKA 4020, EFKA 4046, EFKA 4047, EFKA 4050, EFKA 4055, EFKA 4060, EFKA 4060, EFKA 4060, EFKA 4060, , EFKA 4340, EFKA 4400, EFKA 4401, EFKA 4402, EFKA 440 , EFKA 4800 (above, manufactured by Ciba Specialty); Addisper PB711 (above, manufactured by Ajinomoto Fine-Techno); Anti-Terra-205 (produced by Big Chemie), KF-1525, Hinoact 1300M, Hinoact T9050, Hinoact T6000, Hinoact T7000, Hinoact T8000, Hinoact T8000E (manufactured by Kawaken Fine Chemical Co., Ltd.) and the like.
By using such a dispersant (acid value dispersant and amine value dispersant), the dispersion stability of the pigment in the ink is excellent without adversely affecting the color of the formed colored portion. can do.

When the acid value dispersant and the amine value dispersant are used in combination, the acid value of the acid value dispersant (acid value when converted to solid content) is not particularly limited, but is preferably 5 to 370 KOHmg / g. It is more preferably 20 to 270 KOH mg / g, and further preferably 30 to 135 KOH mg / g. When the acid value of the acid value dispersant is within the above range, the dispersion stability of the pigment when used in combination with the amine value dispersant can be made particularly excellent, and it is also used in combination with the amine value dispersant. In this case, the effect of reducing and stabilizing the viscosity of the color filter ink can be obtained more remarkably. The acid value of the dispersant can be determined by a method based on DIN EN ISO 2114, for example.
Moreover, it is preferable that the acid value dispersant does not have a predetermined amine value, that is, the amine value is zero.

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

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 in the color filter ink When the content 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. More preferably. By satisfying such a relationship, the synergistic effect due to the combined use of the acid value dispersant and the amine value dispersant is more prominently exhibited, and the droplet discharge stability and the like are particularly excellent. it can.
Moreover, you may use a dispersing agent other than the above as a dispersing agent.
The content of the dispersant in the color filter ink is preferably 0.5 to 15 wt%, and more preferably 0.5 to 8 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, etc .; various polymerization initiators; acid cross-linking agents; sensitizers; light stabilizers; Agents; various polymerization accelerators; various light stabilizers; fillers such as glass and alumina; vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, N- (2-aminoethyl) -3 Aminopropylmethyldimethoxysilane, N- (2-aminoethyl) -3-aminopropyl Methoxysilane, 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-chloropropyl Adhesion promoters such as methyldimethoxysilane, 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; poly Agglomeration prevention such as sodium acrylate Agent, and the like.

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

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

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

  The viscosity at 25 ° C. of the color filter ink (viscosity measured using a vibration viscometer) is not particularly limited, but is preferably 4 to 12 mPa · s, and more preferably 5 to 11 mPa · s. preferable. When the viscosity of the color filter ink is within the above-mentioned range, in the droplet discharge by the ink jet method as described later, the droplet discharge is performed while the variation in the appropriate amount of the color filter ink discharged is particularly small. The occurrence of clogging in the head can be prevented more reliably. The viscosity of the color filter ink can be measured using, for example, a vibration viscometer, and can be performed in particular in accordance with JIS Z8809.

≪Method for producing color filter ink≫
Next, a preferred embodiment of the method for producing the color filter ink as described above will be described.
Hereinafter, the case where a pigment is used as a colorant will be described as a specific example of an embodiment of a method for producing a color filter ink.
The manufacturing method of this embodiment includes a dispersion resin solution preparation step of preparing a dispersion resin solution in which at least one of the polymer W and the polymer Z is dissolved in a solvent as a dispersion resin, a pigment is added to the dispersion resin solution, and inorganic The method includes a fine dispersion step of adding a bead in multiple stages to perform fine dispersion treatment to obtain a pigment dispersion, and a mixing step of mixing the pigment dispersion with a resin material and the like.

<Dispersed resin solution preparation process>
In the dispersion resin solution preparation step, a dispersion resin solution in which at least one of the polymer W and the polymer Z is dissolved in a solvent as a dispersion resin is prepared. Thus, prior to the step of finely dispersing the pigment described later (fine dispersion step), by adjusting the liquid (dispersed resin solution) mixed with the pigment, the aggregate of pigment particles used as a raw material can be easily and reliably obtained. In addition, the pigment particles can be finely divided (pulverized), and re-aggregation of the finely divided pigment particles can be prevented. This is presumably because the presence of the polymers W and Z around the pigment particles prevented contact between the pigment particles and hindered aggregation of the pigment particles. Moreover, the dispersion stability of the pigment in the finally obtained color filter ink can be made particularly excellent.

  Further, in this specification, the dispersion resin refers to a resin used for improving the efficiency of fine dispersion by mixing with the pigment aggregate when finely dispersing the pigment aggregate. In addition, the dispersion resin not only improves the efficiency of fine dispersion, but also prevents aggregation of pigment particles once dispersed. In the manufactured ink, the dispersion resin functions as a binder resin together with other resins.

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

The content of the dispersant in the dispersion resin solution prepared in this step (the sum of the content when a plurality of types of dispersant is included) is not particularly limited, but is preferably 5 to 30 wt%. More preferably, it is ˜25 wt%. When the content of the dispersant is a value within the above range, the effects as described above are more remarkably exhibited.
Moreover, the content rate of the solvent in the dispersion resin solution prepared in this step is not particularly limited, but is preferably 40 to 80 wt%, and more preferably 53 to 75 wt%. When the content of the solvent is within the above range, the effects as described above are more remarkably exhibited. In addition, as a solvent, what has the same composition as the liquid medium which comprises the target color filter ink may be used, and the thing of a different composition may be used. In this step, when a solvent having a composition different from the liquid medium constituting the target color filter ink is used as the solvent, for example, in a later step, diluted with a predetermined liquid (solvent), A liquid medium having a desired composition can be obtained in the finally obtained color filter ink by substituting a liquid (solvent) accompanied by a decompression treatment, a heat treatment or the like.
Further, the dispersed resin solution may contain a resin material other than the polymers W and Z. For example, the dispersion resin solution may contain other resin materials such as a thermoplastic resin.

In this step, a dispersed resin solution can be obtained by stirring the mixture of the above components using various stirrers.
Examples of the stirrer that can be used in this step include a uniaxial or biaxial mixer such as a disper mill.
Although the stirring processing time using a stirrer is not specifically limited, It is preferable that it is 1 to 30 minutes, and it is more preferable that it is 3 to 20 minutes.

  Moreover, the rotation speed of the stirring blade which the stirrer has in this step is not particularly limited, but is preferably 500 to 4000 rpm, and more preferably 800 to 3000 rpm. Thereby, while making the productivity of the color filter ink sufficiently excellent, the dispersion stability of the pigment particles in the finally obtained color filter ink can be made particularly excellent. Further, deterioration, modification, and the like due to heat or the like of the polymers W and Z and the dispersant can be more reliably prevented.

<Fine dispersion process>
Next, a pigment is added to the dispersion resin solution obtained in the above step, and inorganic beads are added in multiple stages to perform fine dispersion treatment (fine dispersion step).
As described above, since the dispersion resin solution used in this step contains at least one of the polymer W or the polymer Z, the pigment can be efficiently atomized (disintegrated), and the color filter ink The productivity can be made particularly excellent. In this step, as described above, the presence of the polymers W and Z around the pigment particles prevents the pigment particles from coming into contact with each other, and promotes the micronization (pulverization) of the pigments. This is considered to prevent the aggregated pigment particles from reaggregating.

By the way, as mentioned above, the polymers W and Z are curable resins. The polymers W and Z are compounds that are stable against mechanical force. For this reason, in this process, the polymers W and Z can be suitably used as the dispersion resin.
In addition, it is conceivable to use a resin that does not cause a curing reaction, such as a thermoplastic resin, as the dispersion resin. However, when such a resin is used, the viscosity of the produced color filter ink tends to be high, and the color filter When the viscosity of the color ink is high, the fluidity of the color filter ink tends to be lost at a relatively early stage when the liquid medium is removed when forming the colored portion. Further, the color portion finally formed using the color filter ink has low hardness, chemical resistance, and solvent resistance, and the durability of the color filter is inferior. For this reason, such a color filter cannot maintain the brightness and contrast ratio as excellent over a long period of time. On the other hand, in this embodiment, by using the polymers W and Z, which are curable resins, as the dispersion resin, it is possible to reduce the resin other than the curable resin contained in the color filter ink. The color filter finally formed using the color filter ink can be made more durable.
Further, when a general curable resin is used as a dispersion resin, a curing reaction tends to start when the pigment is dispersed, and it becomes difficult to increase the viscosity and produce an ink.

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

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

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

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

The average particle diameter of the first inorganic beads is not particularly limited, but is preferably 0.5 to 3.0 mm, more preferably 0.5 to 2.0 mm, and 0.5 to 1.2 mm. More preferably.
Although the usage-amount of a 1st inorganic bead is not specifically limited, It is preferable that it is 100-600 weight part with respect to dispersion resin solution: 100 weight part, and it is more preferable that it is 200-500 weight part.
Although the usage-amount of the pigment added to a dispersion resin solution is not specifically limited, It is preferable that it is 12 weight part or more with respect to dispersion resin solution: 100 weight part, and it is more preferable that it is 18-35 weight part.

The first treatment can be performed by stirring using various stirrers in a state where the pigment and the first inorganic beads are added to the polymer W solution.
Examples of the stirrer that can be used in the first treatment include a media-type disperser such as a pearl mill, a uniaxial or biaxial mixer such as a disper mill, and the like.
The stirring time using the stirrer (processing time of the first processing) is not particularly limited, but is preferably 10 to 120 minutes, and more preferably 15 to 40 minutes.

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

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

It is preferable that the second inorganic beads used in the second treatment have a smaller particle diameter than the first inorganic beads used in the first treatment.
The average particle diameter of the second inorganic beads is not particularly limited, but is preferably 0.03 to 0.3 mm, and more preferably 0.05 to 0.2 mm.
Although the usage-amount of a 2nd inorganic bead is not specifically limited, It is preferable that it is 100-600 weight part with respect to dispersion resin solution: 100 weight part, and it is more preferable that it is 200-500 weight part.

The second treatment can be performed using various stirrers.
Examples of the stirrer that can be used in the second treatment include a media-type disperser such as a pearl mill, a uniaxial or biaxial mixer such as a disper mill, and the like.
The stirring time using the stirrer (second processing time) is not particularly limited, but is preferably 10 to 120 minutes, and more preferably 15 to 40 minutes.

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

In the above description, the case where fine dispersion processing is performed in two stages has been mainly described, but three or more stages of processing may be performed. In such a case, it is preferable that the inorganic beads used in the subsequent treatment have a smaller particle size than the inorganic beads used in the previous treatment. In other words, the average particle diameter of the inorganic beads (n-th inorganic beads) used in the n-th stage treatment is that of the inorganic beads ((n-1) inorganic beads) used in the (n-1) -stage treatment. The average particle size is preferably smaller.
In the fine dispersion step (for example, the first process and the second process), for example, a process such as dilution with a solvent may be performed as necessary.

<Mixing process>
The pigment dispersion obtained in the fine dispersion step as described above is mixed with a material used for color filter ink such as a flattening agent and an additional resin material (mixing step). Thereby, the ink for color filters is obtained. In this step, for example, a leveling agent and a curable resin such as polymers X and Y can be mixed with the pigment dispersion. Further, materials such as the above-described polymers W and Z and a dispersant may be further added and mixed with the pigment dispersion.
This step is preferably performed in a state where the second inorganic beads used in the second treatment are removed. The removal of the second inorganic beads can be easily and reliably performed by a method such as filtration.

This step can be performed using various stirrers.
Examples of the stirrer that can be used in this step include a uniaxial or biaxial mixer such as a disper mill.
The stirring time using the stirrer (processing time in this step) is not particularly limited, but is preferably 1 to 60 minutes, more preferably 15 to 40 minutes.
Moreover, the rotation speed of the stirring blade which the stirrer has in this step is not particularly limited, but is preferably 1000 to 5000 rpm, and more preferably 1200 to 3800 rpm.
In this step, a liquid having a composition different from that of the solvent used in the step may be added. Accordingly, the color filter having desired characteristics while suitably performing the dissolution of the polymers W and Z in the dispersion resin solution preparation step, the dispersion of the dispersant, and the fine dispersion of the pigment particles in the fine dispersion step. The ink for use can be obtained reliably.

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

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

《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 section perspective view, (b) is a 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. Further, the substrate 11 prepared in this step is subjected to appropriate pretreatment such as chemical treatment with a silane coupling agent or the like, plasma treatment, ion plating, sputtering, gas phase reaction method, vacuum deposition, and the like. Also good.

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

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

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

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

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

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

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

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

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

The nozzle plate 128 is provided with a base material made of stainless steel, a silica film provided to cover the base material and mainly made of a silica compound, and provided 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, the liquid medium can be removed gently while preventing the convection of the color filter ink 2 by heating the substrate 11 at a relatively low temperature in the first heat treatment. Further, even after the solvent is sufficiently volatilized in this treatment, the color filter ink 2 has fluidity because the above-described color filter ink contains the polymers W and Z. For this reason, the surface of the color filter ink 2 becomes flat in a state where the volatilization amount of the solvent is reduced and the convection of the color filter ink 2 is suppressed. Moreover, the unintentional curing reaction of the resin material can be prevented by heating at a relatively low temperature.

  In the second heat treatment, the liquid medium that could not be removed by the first heat treatment can be completely removed. Further, when the color filter ink 2 contains a polyhydric alcohol, the polyhydric alcohol can be efficiently volatilized or decomposed and removed. Further, in this step, the color filter ink 2 whose surface has been flattened by the first heat treatment can be efficiently cured in its shape by reacting with a resin material (curable resin material). .

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.
Moreover, the time of the first heat treatment is not particularly limited, but is preferably 3 to 50 minutes, and more preferably 5 to 40 minutes.

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. Thereby, the liquid medium which could not be removed by the first heat treatment can be completely removed. Further, when the color filter ink 2 contains a polyhydric alcohol, the polyhydric alcohol can be efficiently volatilized or decomposed and removed. Further, in this step, the color filter ink 2 having a flat surface in the first treatment can be efficiently cured in the shape.
The time for the second heat treatment is not particularly limited, but is preferably 25 to 150 minutes, and more preferably 30 to 100 minutes.

  Further, in this step, for example, treatment such as irradiation with active energy rays or placing the substrate 11 to which the color filter ink 2 is applied in a reduced pressure environment may be performed. By irradiating the active energy 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 provided with the color filter ink 2 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 side of the color filter 1 on which the colored portion 12 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 side of the substrate 66 opposite to the surface facing the liquid crystal layer 62 (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 portion 1104 having a keyboard 1102 and a display unit 1106. The display unit 1106 is supported by the main body portion 1104 so as to be rotatable via a hinge structure portion. Yes.
In the personal computer 1100, the display unit 1106 includes an image display device 1000.
FIG. 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 includes a plurality of operation buttons 1202, an earpiece 1204 and a mouthpiece 1206, and an image display device 1000 in a display unit.

FIG. 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 salt photographic film with a light image of a subject, whereas a digital still camera 1300 photoelectrically converts a light image of a subject with an image sensor such as a CCD (Charge Coupled Device). An imaging signal (image signal) is generated.

On the back of a case (body) 1302 in the digital still camera 1300, an image display device 1000 is provided in a display unit, and is configured to display based on an image pickup signal from a CCD, and a finder that displays an object as an electronic image. Function as.
A circuit board 1308 is installed inside the case. The circuit board 1308 is provided with a memory that can store (store) an imaging signal.

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

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

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

As mentioned above, although this invention was demonstrated based on suitable embodiment, this invention is not limited to these.
For example, in the above-described embodiment, after applying the color filter ink corresponding to the colored portion of each color into the cell, the liquid medium is removed from the color filter ink of each color in the cell 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 above-described embodiment, the case where the colored portion includes three types (three colors) of colored portions corresponding to the three primary colors of light has been mainly described. However, the type (color) of the colored portion is as described above. It is not limited to. For example, the color filter may include a colored portion having four or more colors.
In the above-described embodiment, the colored portion forming process has been described as performing two stages of heat treatment. However, the colored portion may be formed by a single heat treatment, or in a single heat treatment. The heating temperature may be changed.

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

(Synthesis Examples 2 to 8)
Synthesis Example 1 except that the ratio of monomer components constituting the polymer was changed as shown in Table 1 by changing the type of solvent (solvent) used in the synthesis of the polymer and the ratio of each component. The same operation was performed. As a result, seven types of polymers (polymers W2 to W8) dissolved in the solvent were obtained.
(Synthesis Example 9)
Synthesis Example 1 except that the ratio of monomer components constituting the polymer was changed as shown in Table 1 by changing the type of solvent (solvent) used in the synthesis of the polymer and the ratio of each component. The same operation was performed. As a result, polymer W′1 dissolved in the solvent was obtained.

(Synthesis Example 10)
Into a reaction vessel (flask) equipped with a stirrer, reflux condenser, dropping funnel, nitrogen inlet tube and thermometer, 246 parts by weight of diethylene glycol monobutyl ether acetate as a solvent was put and heated to 80 ° C. Subsequently, in the flask, the monomer component (compound) represented by the above formula (5) z1: 273 parts by weight, the monomer component (compound) represented by the above formula (6) z2: 36 weights. Part of the monomer component (compound) represented by the above formula (7): 41 parts by weight, and 39 parts by weight as a radical initiator dissolved in methoxybutyl acetate: 360 parts by weight. The solution was added dropwise over 5 hours, and further aged for 3 hours.
Thereafter, 26 parts by weight of glycidyl methacrylate and 2 parts by weight of methoquinone were added to the flask and reacted at 110 ° C. for 10 hours. Then, it cooled to room temperature, melt | dissolved in the solvent, and obtained the polymer Z1 as the polymer Z represented by the said Formula (18) including the monomer components z1, z2, and z3.

(Synthesis Examples 11-15)
The synthesis example 13 except that the ratio of the monomer components constituting the polymer was changed as shown in Table 1 by changing the type of the solvent (solvent) used in the synthesis of the polymer and the ratio of each component. The same operation was performed. As a result, five types of polymers (polymers Z2 to Z6) dissolved in the solvent were obtained.
(Synthesis Example 16)
The synthesis example 13 except that the ratio of the monomer components constituting the polymer was changed as shown in Table 1 by changing the type of the solvent (solvent) used in the synthesis of the polymer and the ratio of each component. The same operation was performed. As a result, polymer Z′1 dissolved in the solvent was obtained.

(Synthesis Example 17)
In a reaction vessel (flask) equipped with a stirrer, reflux condenser, dropping funnel, nitrogen inlet tube and thermometer, 314 parts by weight of diethylene glycol monobutyl ether acetate as a solvent was placed and heated to 90 ° C. Subsequently, 2,2′-azobis (isobutyronitrile) (AIBN) as a radical initiator: 20 parts by weight and diethylene glycol monobutyl ether acetate (solvent): 30 parts by weight were added to the flask. The monomer component (compound) represented by the above formula (8) x1: 180 parts by weight, the monomer component (compound) represented by the above formula (9) x2: 90 parts by weight, the above formula (10) Monomer component (compound) x3: 15 parts by weight, monomer component (compound) x4: 15 parts by weight represented by the above formula (11), 2,2′-azobis (isobutyronitrile) ) (AIBN): A solution prepared by dissolving 50 parts by weight of diethylene glycol monobutyl ether acetate: 200 parts by weight was added dropwise using a dropping pump over 5 hours, and further aged for 4 hours. Then, it cooled to room temperature, melt | dissolved in the solvent, and obtained the polymer X1 as the polymer X represented by the said Formula (19) including the monomer components x1, x2, x3, x4.

(Synthesis Examples 18-21)
Synthetic Example 21 except that the ratio of monomer components constituting the polymer was changed as shown in Table 1 by changing the type of solvent (solvent) used in the synthesis of the polymer and the ratio of each component. The same operation was performed. As a result, four types of polymers (polymers X2 to X5) dissolved in the solvent were obtained.

(Synthesis Example 22)
In a reaction vessel (flask) equipped with a stirrer, reflux condenser, dropping funnel, nitrogen inlet tube and thermometer, 314 parts by weight of diethylene glycol monobutyl ether acetate as a solvent was placed and heated to 90 ° C. Subsequently, 2,2′-azobis (isobutyronitrile) (AIBN) as a radical initiator: 20 parts by weight and diethylene glycol monobutyl ether acetate (solvent): 30 parts by weight were added to the flask. The monomer component (compound) represented by the above formula (12) y1: 200 parts by weight, the monomer component (compound) y2 represented by the above formula (13): 100 parts by weight, 2,2′- A solution obtained by dissolving 50 parts by weight of azobis (isobutyronitrile) (AIBN) in 200 parts by weight of diethylene glycol monobutyl ether acetate was added dropwise over 5 hours using a dropping pump, and the mixture was further aged for 4 hours. Then, it cooled to room temperature, melt | dissolved in the solvent, and obtained the polymer Y1 as the polymer Y containing the monomer components y1 and y2 and represented by the said Formula (20).

(Synthesis Examples 23 to 26)
The synthesis example 26 except that the ratio of monomer components constituting the polymer was changed as shown in Table 1 by changing the type of solvent (solvent) used in the synthesis of the polymer and the ratio of each component. The same operation was performed. As a result, four types of polymers (polymers Y2 to Y5) dissolved in the solvent were obtained.

  Table 1 summarizes the types and amounts of materials used for the synthesis of the polymers in Synthesis Examples 1 to 26 (compositions of the polymers synthesized in Synthesis Examples 1 to 26). In the table, “S” means a solvent (solvent), in particular, “S1” indicates diethylene glycol monobutyl ether acetate, and “S2” indicates 1,3-butylene glycol diacetate. , “S3” represents 2- (2-methoxy-1-methylethoxy) -1-methylethyl acetate, “S4” represents bis (2-butoxyethyl) ether, and “S5” represents 3 -Indicates ethyl ethoxypropionate. In the table, the weight average molecular weight Mw of each polymer is also shown. In addition, as for the polymer synthesize | combined as mentioned above, all had dispersion degree (weight average molecular weight Mw / number average molecular weight Mn) in the range of 1-3.

[1] Preparation of color filter ink (ink set) (ink set 1)
Dispersic 111 as an acid value dispersant, Dispersic 166 as an amine value dispersant, polymer W1, and diethylene glycol monobutyl ether acetate as a solvent (liquid medium) are mixed with a stirrer (uniaxial mixer) having a content of 400 cc. ) And stirred for 10 minutes with a disper mill to obtain a dispersed resin solution (dispersed resin solution adjustment 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 dispersion resin solution obtained in the dispersion resin solution adjustment step, and inorganic beads were added in multiple stages for fine dispersion treatment.
First, a pigment was added to the obtained dispersion resin solution and stirred for 10 minutes. At this time, the rotation speed of the stirring blade of the stirrer was set to 2000 rpm. Examples of the pigment include C.I. I. Pigment Red 177 and a pigment derivative represented by the above formula (14); I. A mixture of Pigment Red 254 and the pigment derivative represented by the above formula (15) and a powder of a sulfonated pigment derivative having a chemical structure represented by the above formula (16) were used. At this time, the mixture was diluted with diethylene glycol monobutyl ether acetate so that the pigment content in the mixture of the dispersion resin solution and the pigment was 16 wt%.

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

  Next, to the pigment dispersion obtained as described above, a polymer X1, a polymer Y1, polyethylene glycol # 300 (weight average molecular weight: 300) as a polyhydric alcohol, and a leveling agent MegaFuck F-444 (manufactured by Dainippon Ink & Chemicals, Inc.) was added and mixed (mixing step). This step was performed by putting each of the above materials into a stirrer (uniaxial mixer) having an internal capacity of 400 cc and stirring for 10 minutes with a disper mill. At this time, the rotation speed of the stirring blade of the stirrer was set to 2000 rpm. As a result, the intended red color filter ink (R ink) was obtained. The content rate of the pigment of the obtained R ink was 7.3 wt%.

  In addition, the color filter ink (G ink) and the blue color filter ink (B ink) are the same as the red color filter ink except that the type of pigment and the amount of each component used are changed. Was prepared. As a result, an ink set 1 composed of three colors of R, G, and B was obtained. The average particle diameter of the pigment constituting the R ink, the average particle diameter of the pigment constituting the G ink, and the average particle diameter of the pigment constituting the B ink were 70 nm, 70 nm, and 70 nm, respectively. Examples of the G ink pigment include C.I. I. Pigment Green 58 and a sulfonated pigment derivative powder having a chemical structure represented by the above formula (16) were used, and the pigment content in the final G ink was 10.1 wt%. Examples of the B ink pigment include C.I. I. Pigment Blue 15: 6 was used, and the pigment content in the final B ink was 4.9 wt%.

(Ink set 2-12)
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 177 is “PR177”, C.I. I. Pigment Red 254 is "PR254", C.I. I. Pigment Red 177 and a pigment derivative represented by the formula (14) “PR177D”, C.I. I. Pigment Red 254 and a pigment derivative represented by the formula (15) “PR254D”, and a powder composed of the pigment derivative represented by the formula (16) is “SPD”, C.I. I. Pigment Green 58 is changed to “PG58”, C.I. I. Pigment Green 36 is “PG36”, C.I. I. Pigment Blue 15: 6 is changed to “PB15: 6”, C.I. I. Pigment Yellow 150 is “PY150”, Dispersic 111 (acid value: 50 KOHmg / g) is “DA1”, Dispersic 2095 (acid value: 13 KOHmg / g) is “DA2”, Dispersic 9075 (amine value: 12 KOHmg / g) ) “DA3”, Dispersic 166 (amine number: 115 KOH mg / g) “DA4”, polyethylene glycol # 300 (average weight molecular weight: 300, viscosity: 70 mPa · s) “PEG1”, polyethylene glycol # 400 (average) Weight molecular weight: 400, viscosity: 90 mPa · s) is “PEG2”, polyethylene glycol # 200 (average weight molecular weight: 200, viscosity: 50 mPa · s) is “PEG3”, polyethylene glycol # 600 (average weight molecular weight: 600, viscosity : 135mP S) is “PEG4”, polypropylene glycol # 400 (molecular weight: 400, viscosity: 70 mPa · s, monomer component: 1,2-propylene glycol) is “PPG1”, polypropylene glycol # 1000 (average weight molecular weight: 1000) , Viscosity: 150 mPa · s, monomer component: 1,2-propylene glycol) “PPG2”, polypropylene glycol # 2000 (average weight molecular weight: 2000, viscosity: 310 mPa · s, monomer component: 1,2- "PPG3" for propylene glycol) and "F444" for leveling agent (Megafac F-444, manufactured by Dainippon Ink & Chemicals, Inc.) and leveling agent (olefin SPC, manufactured by Nissin Chemical Industry Co., Ltd.) "SPC", ACRYDIC A-188 (resin material A, non-curable acrylic resin, D IC Co.) is indicated by “A”. 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 addition, C. used in each Example and each comparative example. I. The content of the pigment derivative represented by the formula (14) in the mixture of Pigment Red 177 and the pigment derivative represented by the formula (14) was 0.1 to 10 wt%. In addition, C.I. used in the above Examples and Comparative Examples. I. The content of the pigment derivative represented by the formula (15) in the mixture of Pigment Red 254 and the pigment derivative represented by the formula (15) was 0.1 to 10 wt%.

[2] Evaluation of color filter ink [2.1] 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 drive 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.

[2.2] Measurement of thixo index For each color filter ink, using an E-type viscometer and setting the color filter ink to 25 ° C., the E-type viscosity (η _{6 under} the conditions of the rotational 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.

[3] 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 alkali developer, and further by performing post-baking to separate 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 was 150 μm, and the length in the long side direction 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 10)
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.
(Comparative Examples 1 and 2)
A color filter was produced in the same manner as in Example 1 except that the ink set was changed to that shown in Table 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. For the color filters of the examples and comparative examples, the average deviation T _SD [μm] of the thickness of the colored portion between the colored portions of the same color was determined.
These results are shown in Tables 4 and 5 together with the types of ink sets used in each Example and Comparative Example.

[4] Evaluation of color filters The following evaluations were performed using the color filters of Examples and Comparative Examples obtained as described above.
[4.1] Evaluation of transmission streaks Using the color filters of the respective examples and comparative examples, an image display device as shown in FIG. 8 was produced, and white display was performed on the image display device. The display screen was visually observed, and the occurrence of transmission streaks was evaluated according to the following five-step criteria.
A: No transmission streak is observed.
B: Transmission lines are slightly observed.
C: Transmission lines are observed.
D: A transmission streak is clearly recognized.
E: Permeation streaks are noticeable.

[4.2] Evaluation of contrast ratio The liquid crystal display devices of the above Examples and Comparative Examples manufactured in [4.1] were evaluated as shown below. A liquid crystal display device is used to display a red single color display, a green single color display, and a blue single color display. The contrast ratio (CR) compared with the case where display was not performed was obtained, and evaluation was performed 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.

[4.3] Evaluation of lightness The liquid crystal display devices of the above Examples and Comparative Examples manufactured in [4.1] were evaluated as follows. 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 used as the brightness Y of white light, and evaluated according to the following five-step 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. In addition, in the color filters of each example, generation of transmission streaks 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 ... Liquid crystal layer 63 and 64 ... Alignment film 65 ... Pixel electrode 66 ... Substrate (counter substrate) 67, 68 ... Polarizing plate 100 ... Droplet ejection device 101 ... Tank 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 ... Electrodes 124C ... Piezo elements 126 ... Vibrating plate 127 ... Discharge unit 128 ... Nozzle plate 129 ... Liquid pool 130 ... Supply port 131 ... Hole 1000 ... Image display device 1100 ... Personal computer 1102 ... Keyboard 1104 ... Main body 1106 ... Display unit 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 in which a plurality of colored portions of a plurality of colors are provided on a substrate by a droplet discharge method using a color filter ink,
When the color filter is viewed in plan, a region in the colored portion that is similar to the colored portion, has a similarity ratio of 0.90 to the colored portion, and has a center of gravity at the same point as the colored portion. When the effective area is defined, and the minimum value of the thickness of the colored portion in the effective area is T _min [μm] and the maximum value of the thickness is T _max [μm], the colored portion of at least one color in the color filter The average value for T _min / T _max of each colored portion is 0.85 to 1.00,
The color filter ink includes a colorant, a liquid medium in which the colorant is dissolved or dispersed, a monomer component w1 represented by the following formula (1), and a single amount represented by the following formula (2). A polymer W comprising a body component w2, a monomer component w3 represented by the following formula (3), and a monomer component w4 represented by the following formula (4); It includes at least one of a polymer component Z including a monomer component z1, a monomer component z2 represented by the following formula (6), and a monomer component z3 represented by the following formula (7). Color filter characterized by being.

In a plan view of the color filter, each of the plurality of colored portions has a rectangular shape,
When the cross section A perpendicular to the substrate in the short side direction of the rectangle and passing through the center of gravity of the effective area is observed, the minimum value of the thickness in the effective area of the cross section A is TA _min [μm], and the cross section When the maximum value of the thickness in the effective area of A is TA _max [μm], the average value of TA _min / TA _max of each colored portion for the colored portion of at least one color in the color filter is 0. The color filter according to claim 1, wherein the color filter is 88 to 1.00. In a plan view of the color filter, each of the plurality of colored portions has a rectangular shape,
When the cross section B perpendicular to the substrate in the long side direction of the rectangle and passing through the center of gravity of the effective area is observed, the minimum value of the thickness in the effective area of the cross section B is TB _min [μm], and the cross section When the maximum value of the thickness of B in the effective region is TB _max [μm], the average value of TB _min / TB _max of each colored portion with respect to at least one colored portion of the color filter is 0.92 The color filter according to claim 1 or 2, which is -1.00.   The color filter according to claim 1, wherein an average thickness of the colored portion is 1.0 to 2.5 μm. The color filter ink contains the polymer W,
The content of the monomer component w1 in the total components constituting the polymer W is 25 to 75 wt%,
The content of the monomer component w2 in the total components constituting the polymer W is 2 to 25 wt%,
The content rate of the monomer component w3 in the total components constituting the polymer W is 5 to 50 wt%,
5. The color filter according to claim 1, wherein the content of the monomer component w <b> 4 in all the components constituting the polymer W is 3 to 40 wt%. The color filter ink contains the polymer Z,
The content of the monomer component z1 in the total components constituting the polymer Z is 50 to 95 wt%,
The content of the monomer component z2 in the total components constituting the polymer Z is 3 to 35 wt%,
6. The color filter according to claim 1, wherein the content of the monomer component z <b> 3 in all components constituting the polymer Z is 3 to 35 wt%.   The color filter according to any one of claims 1 to 6, 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 7, wherein the leveling agent contains a polyhydric alcohol.   The color filter according to claim 8, wherein the polyhydric alcohol is an oligomer of glycols. The polyhydric alcohol is liquid in an atmosphere of 25 ° C. and 1 atm,
The color filter according to claim 8 or 9, wherein the polyhydric alcohol has a viscosity of 40 to 400 mPa · s at 25 ° C. The color filter ink further includes a monomer component x1 represented by the following formula (8), a monomer component x2 represented by the following formula (9), and a single quantity represented by the following formula (10). The color filter according to any one of claims 1 to 10, comprising a polymer X comprising a body component x3 and a monomer component x4 represented by the following formula (11).

2. The color filter ink further comprises a polymer Y containing a monomer component y1 represented by the following formula (12) and a monomer component y2 represented by the following formula (13). The color filter in any one of thru | or 11.

  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.

Images