JPH10253819A - Ink for liquid crystal color filter, and manufacture of liquid crystal color filter using same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink capable of forming a liquid crystal color filter having an excellent printed shape such as pattern surface flatness without any occurrence of piling, as well as a method for manufacturing a liquid crystal color filter using the ink. SOLUTION: This ink for liquid crystal color filter contains a resin, a coloring agent and liquid mold releasing component, and the liquid mold releasing component is made of an organic solvent. Also, a difference between the SP value (dissolution parameter) of the organic solvent and the SP value of the ink without containing the liquid releasing component is between 0.3 and 3.5. Also, a method for manufacturing the liquid crystal color filter is that the recess of a recessed plate is filled with the ink and then the ink is transferred to a blanket. Then, the ink is transferred from the blanket to a transparent substrate, thereby forming an ink layer on the surface of the transparent substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal color filter ink suitable for printing by an intaglio offset printing method, and a method for manufacturing a liquid crystal color filter using the ink.

[0002]

2. Description of the Related Art A liquid crystal color filter used for realizing a color display of a liquid crystal display includes, for example,
A pattern of a color filter layer of red (R), green (G) and blue (B) and a pattern of a black matrix layer for shading are formed on a transparent substrate. The color filter layer and black matrix layer patterns have extremely high precision, such as extremely fine line width, flat surface, and sharp edges, in order to respond to high image quality of liquid crystal displays. It is required to be formed with it. Therefore, conventionally, a photolithography method capable of obtaining a pattern with high dimensional accuracy has been used for forming a color filter layer and a black matrix layer. However, this photolithography method requires a complicated manufacturing process or a high manufacturing cost. There was a problem that it became expensive.

On the other hand, in recent years, an attempt has been made to manufacture a liquid crystal color filter by using a printing method instead of the photolithographic method. In this printing method, a color filter layer ink or a black matrix layer (light shielding layer) ink is printed on a transparent substrate to form a pattern composed of an ink coating film. It is excellent and is expected to be able to realize the cost reduction of the liquid crystal color filter.

There are various printing methods described above. Among them, the intaglio offset printing method can form a fine pattern with extremely high dimensional accuracy, and is therefore most suitable for manufacturing a liquid crystal color filter. However, in the intaglio offset printing method, the ink filled in the indentations of the intaglio is not completely transferred onto the blanket, or the ink on the blanket is not completely transferred onto the transparent substrate, which is a printing substrate. There is a problem that piling (separation of ink) is likely to occur. For this reason, the flatness of the pattern surface of the liquid crystal color filter tends to be low, and the reproducibility of the pattern tends to be poor, which causes color unevenness and shading unevenness. In particular, the black matrix layer is required to faithfully reproduce an extremely fine pattern of about 20 μm, and when piling occurs when the black matrix layer is formed, the light shielding property and the aperture ratio of the liquid crystal color filter are adversely affected. In addition, there is a problem that the image quality of the liquid crystal display deteriorates.

[0005]

Various studies have hitherto been made to prevent the occurrence of the above-mentioned piling. For example, when a blanket made of silicone rubber is used, the ink is transferred from the blanket to the transparent substrate. It is known that a complete transfer of However, in the process of transferring ink from the intaglio to the blanket, it was not possible to prevent the occurrence of piling because the commonly used intaglio is made of glass or metal and has low ink transferability. .

Therefore, an intaglio whose surface is treated with polytetrafluoroethylene (Teflon resin) is used (JP-A-2-135348), or an intaglio whose surface is coated with silicone rubber is used (JP-A-5-1390065). For example, attempts have been made to improve the transferability of the ink from the intaglio to the blanket. Above all,
When silicone rubber is used for the surface treatment of the intaglio, the releasability of the ink in the intaglio is significantly improved, and complete transfer of the ink from the intaglio to the blanket can be realized.

However, in the case described above, there is a problem that the ink releasability of silicone rubber or the like decreases with time during continuous printing. Therefore, even if the complete transfer of the ink can be realized in the initial stage of printing, the repetition of printing gradually reduces the transferability of the ink and causes piling. In Japanese Patent Application Laid-Open No. 8-99476, an intaglio having an amorphous fluororesin layer formed on the surface is used, and the photocurable ink filled in the intaglio recesses is irradiated with ionizing radiation to form a surface layer of the ink. By making the part in a semi-cured state, the releasability of the ink from the intaglio is improved. However, irradiation with ionizing radiation such as ultraviolet rays or infrared rays has many practical problems, and has problems such as high cost.

Further, in order to improve the transferability of the ink from the intaglio to the blanket, a method of applying a release agent to the surface of the intaglio can be considered for the purpose of reducing the affinity between the intaglio recess and the ink. . However, in this method, it is necessary to apply the release agent each time printing is performed, it is difficult to mechanize the application of the release agent, and it is possible to prevent foreign matter from entering during the application of the release agent. This was disadvantageous from the viewpoint of mass productivity, for example, it was necessary to take measures to prevent it.

Therefore, it is desired to solve the above-mentioned problem by improving the releasability of the ink itself from the intaglio rather than improving the transferability of the ink on the intaglio surface. An object of the present invention is to provide an ink for a liquid crystal color filter that can solve the above technical problems and can obtain a liquid crystal color filter having excellent printing shape such as flatness of a pattern surface without occurrence of piling. A method of manufacturing a liquid crystal color filter using ink.

[0010]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, have obtained an ink for a liquid crystal color filter containing a resin, a colorant and a liquid release component. When the liquid release component is composed of an organic solvent and the difference between the SP value of the liquid release component and the SP value of the ink in a state where the liquid release component is not contained is 0.3 to 3.5, the intaglio offset is used. When forming a color filter layer or a black matrix layer by a printing method, the present inventors have found a new fact that the releasability of the ink from the intaglio recesses is good, and thus it is possible to prevent the occurrence of piling, and to complete the present invention. Reached.

That is, the organic solvent as the liquid release component contained in the ink for a liquid crystal color filter of the present invention has an SP value which is 0.3 or more away from the ink not containing the liquid release component. Has low affinity for ink, while intaglio recesses (especially intaglio recesses made of glass)
It has the characteristic of high affinity with Therefore, when the liquid crystal color filter ink of the present invention is filled in the concave portions of the intaglio, the liquid mold release component oozes out of the ink and is localized at the interface with the concave surface, and the ink is easily transferred from the intaglio concave portion to the blanket. Become. As a result, when a liquid crystal color filter is manufactured by the intaglio offset printing method using the liquid crystal color filter ink,
A liquid crystal color filter having an excellent printed shape such as flatness of the pattern surface can be obtained.

On the other hand, in the method of manufacturing a liquid crystal color filter of the present invention, after filling the ink for a liquid crystal color filter of the present invention into the recesses of the intaglio, the ink is transferred to a blanket, and further transferred from the blanket to a transparent substrate. It is characterized by the following. According to the above-described method of manufacturing a liquid crystal color filter, a pattern having excellent surface flatness can be formed without causing pilling when transferring ink from an intaglio plate to a blanket.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the liquid crystal color filter of the present invention will be described in detail. As described above, the liquid crystal color filter ink of the present invention contains a resin, a colorant and a liquid release component, and is used as a color filter layer ink or a black matrix layer ink depending on the colorant used. Used.

The liquid release component used in the ink for a liquid crystal color filter of the present invention includes (i) SP of the liquid release component.
And the S of the ink without the liquid release component.
The difference in P value is 0.3 to 3.5, and (ii) the affinity with the intaglio recess is higher than that of the ink in the state where the liquid release component is not contained (that is, the “fit-in” is good). thing)
Any organic solvent satisfying the condition may be used.

The SP value (dissolution parameter, Solu
Ability Parameter) indicates compatibility between solvents or between a solvent and a resin. The closer this value is, the higher the compatibility between the solvents or between the solvent and the resin. The SP value of the ink in the present invention can be determined by dissolving the ink in several kinds of solvents having known SP values, and setting the SP value of the solvent having the lowest viscosity as the SP value of the ink.

In the production of a liquid crystal color filter, an intaglio made of a glass substrate such as soda lime glass is usually used. In this case, the SP value of the ink for the liquid crystal color filter generally becomes smaller than the SP value of the intaglio recess. (Ie, the ink has a lower surface activity than the intaglio recesses). Therefore, the SP value of the liquid release component is:
SP of the ink without the liquid release component
It is preferably 0.3 to 3.5 larger than the value.

When a metal substrate such as copper is used as the intaglio, or a glass substrate whose surface is coated with a silicone resin or a fluorine resin is generally used as an ink for a liquid crystal color filter. The SP value is larger than the SP value of the intaglio recess (that is, the ink has a higher surface activity than the intaglio recess). Therefore, it is preferable that the SP value of the liquid release component is 0.3 to 3.5 smaller than the SP value of the ink in a state where the liquid release component is not included.

The SP value of the liquid release component itself is determined in accordance with the SP value of the ink in a state where the liquid release component is not contained, but the intaglio made of a glass substrate such as soda lime glass is used. When used, usually 10.0-1
It is preferably in the range of 5.0. Examples of the organic solvent having an SP value satisfying the above range include various polar solvents, for example, cyclohexanol (SP value = 11.4), diethylene glycol (SP value = 12.0), and furfuryl alcohol (SP value = 12.5). ), Propylene glycol (SP value = 12.6), ethanol (SP value = 12.8), ethylene glycol (SP value = 14.2), methanol (S
Alcohols such as P value = 14.8) and acetic acid (SP value = 1
10.0).

On the other hand, the SP value of the liquid release component itself is determined according to the SP value of the ink in a state where the liquid release component is not contained. When an intaglio made of a glass substrate or the like coated with a resin or a fluororesin is used, the SP value of the liquid release component itself is preferably in the range of 7.0 to 12.0.

Examples of the organic solvent having an SP value satisfying the above range include n-butane (SP value = 7.0), n-octane (SP value = 7.8), and cyclohexane (SP value =
8.25), ethylbenzene (SP value = 8.7), p-
Xylene (SP value = 8.8), toluene (SP value = 8.
9), benzene (SP value = 9.0), ethyl cellosolve (ethylene glycol monoethyl ether, SP value =
9.9), diethylene glycol (SP value = 12.0)
And the like.

In the present invention, the SP value of the liquid release component and the SP value of the ink without the liquid release component are described.
The difference from the value is 0.3 to 3.5, preferably 0.4 to 3.
0. When the difference between the SP value of the liquid release component and the SP value of the ink containing no liquid release component exceeds 3.5, the ink and the liquid release component are separated from each other and are not dissolved at all. Therefore, it is not preferable.

Conversely, when the difference between the SP value of the liquid release component and the SP value of the ink containing no liquid release component is less than 0.3, the affinity between the liquid release component and the intaglio plate is reduced. In addition, the compatibility between the liquid release component and the ink becomes too high, so that the liquid release component does not ooze out of the ink, which is not preferable. In addition, the SP value of the ink in a state not containing the liquid release component is 5 to 16, preferably 7 to 1.
Suitably, it is in the range of 5. If the SP value of the ink in a state where the liquid release component is not included is below the above range, there occurs a problem that a blanket made of silicone rubber or the like swells with the ink. Conversely, if the SP value exceeds the above range, there is a problem that it is difficult for ink to come out of the intaglio recess during printing.

The resin used in the ink for a liquid crystal color filter of the present invention includes, for example, polyester-melamine resin, epoxy resin, acrylic resin, melamine resin, polyester resin and the like. Among them, polyester-melamine resins are preferably used from the viewpoint of the SP value of the resin itself and the printing characteristics of the resin. The SP value of the above resin is suitably from 8 to 11, preferably from 9.5 to 10.5.

As the colorant used in the ink for a liquid crystal color filter of the present invention, various pigments and dyes are used depending on the use of the ink. For example, when the above ink is used as a color filter layer ink, depending on the color of the color filter layer, for example, pigments such as anthraquinone red pigment, halogenated phthalocyanine green pigment, phthalocyanine blue pigment, and auxiliary pigments Yellow pigment or violet pigment may be used.
When used as an ink for a black matrix layer, for example, carbon black, iron oxide (iron black), titanium black, iron sulfate, or the like may be used.

The content of the coloring agent is not particularly limited, but in the case of an ink for a color filter layer, the ink resin 100
Usually, about 10 to 80 parts by weight is blended with respect to parts by weight. In the case of an ink for a black matrix layer, it is usually added in an amount of about 10 to 200 parts by weight based on 100 parts by weight of the ink resin. The ink for a liquid crystal color filter of the present invention is prepared by blending a resin, a colorant, a solvent, and an extender if necessary with the above-described resin, and further mixing the mixture with a mixer such as a three-roll mill or a ball mill. It is obtained by blending a liquid release component.

The ink for a liquid crystal color filter of the present invention preferably has a low viscosity, and more specifically, the value measured by an E (conplate) type viscometer (23.0 ± 0.1 ° C.) is 10%.
Up to 3000 poise (P), preferably 500 to 1000
P is appropriate. In the ink for a liquid crystal color filter of the present invention, the difference between the SP value of the liquid release component and the SP value of the ink without the liquid release component is 0.3 to 3.5. Features. Above all, the SP value of a normal ink is smaller than the SP value of an intaglio made of glass or the like that is generally used in intaglio offset printing, so the SP value of the liquid release component includes this liquid release component. 0.3 ~ than SP value of ink without
3.5 is preferred.

When the SP value of the intaglio recess is reduced by subjecting the intaglio recess to a chemical treatment or coating treatment, the SP value is lower than the SP value of the ink in the state where the liquid mold release component is not contained. It is also possible to use a liquid release component having the following. Next, a method for manufacturing the liquid crystal color filter of the present invention will be described. The method for producing a liquid crystal color filter of the present invention comprises forming an ink layer such as a color filter layer or a black matrix layer on a transparent substrate by intaglio offset printing using the liquid crystal color filter ink of the present invention. is there.

The intaglio substrate used in the method for producing a liquid crystal color filter of the present invention includes, for example, glass such as soda lime glass, non-alkali glass, quartz glass, low alkali glass, and low expansion glass; fluororesin, polycarbonate resin, Resins such as polyethersulfone resin and polymethacrylic resin; metals such as stainless steel, copper and low expansion alloy invar are used. Among them, it is preferable to use soft glass such as soda lime glass in order to reproduce a fine pattern with high accuracy.

The concave portions formed on the surface of the intaglio are formed according to the pattern of the color filter layer and the black matrix layer. The depth of the recess is appropriately set according to the thickness of the color filter layer or the black matrix layer. As the blanket used in the method for producing a liquid crystal color filter of the present invention, various types of conventionally known blankets can be used. In particular, by using a silicone blanket whose surface is made of silicone rubber, the ink from the blanket to the transparent substrate can be completely removed. Transfer can be realized. That is, from the viewpoint of forming a pattern having excellent printing characteristics such as excellent surface flatness, it is preferable to use a silicone blanket in the present invention.

As the transparent substrate used in the method for producing a liquid crystal color filter of the present invention, it is preferable to use a transparent substrate having a high transmittance for light having a wavelength of 400 to 700 nm, such as non-alkali glass, soda lime glass, and low alkali glass. And the like, and a plastic film such as polyether, polysulfone, polyarylate, polyacrylate and the like are preferably used.

In the method of manufacturing a liquid crystal color filter according to the present invention, for example, a black matrix layer for light shielding is printed on the surface of a transparent substrate, and then the three colors of red (R), green (G) and blue (B) are formed. The color filter layer may be printed, or the printing order of the black matrix layer and the color filter layer may be reversed. When the black matrix layer is formed on the array substrate side of the liquid crystal display, the printing of the black matrix layer on the transparent substrate is omitted.

After printing the ink for the color filter layer or the ink for the black matrix layer on the transparent substrate to form each pattern, the conditions under which the transparent substrate is not thermally deformed (specifically, at 180 to 250 ° C., 30 ° C.). Heating conditions of 200 to 230 ° C, preferably 50 to 80 minutes)
When the ink is heated and dried, the ink is completely cured and a liquid crystal color filter is obtained.

[0033]

The present invention will now be described with reference to Reference Examples, Examples and Comparative Examples. Reference Example (Preparation of Polyester-Melamine Resin) Among the components shown in Table 1 below, "Melamine Sumimar M100C"
Components other than (hexamethoxymethylolmelamine) were mixed at the ratios shown in the same table, and heated at 200 ° C. for 5 hours to polymerize, thereby obtaining a polyester resin.

[0034]

[Table 1]

Weight average molecule of the obtained polyester resin
Quantity M_WIs 2500 and the acid value (AV) is 23 KOH mg /
g. Then, the polyester resin and Table 1
"Melamine Sumimar M100C" (shown above)
Mix and heat at 98 ° C for 7 hours to apply melamine modification.
did. The SP value of the obtained polyester-melamine resin is
10.0, weight average molecular weight M _WIs 18500, acid value (A
V) was 14 KOH mg / g and the viscosity was 8400P.
Was.

[0036] Incidentally, the weight average molecular weight M _W of the resin liquid chromatography (manufactured by Tosoh of "HLC-8120GP
C "). Example 1 (Production of Ink for Liquid Crystal Color Filter) Along with the polyester-melamine resin obtained in the above Reference Example, a coloring agent,
The solvent and the dispersant were mixed in the amounts (parts by weight) shown in Table 2 and premixed with a planetary mixer (manufactured by Inoue Seisakusho).

[0037]

[Table 2]

Then, the polyester-melamine resin is finely pulverized in a ball mill until the average particle diameter of the resin becomes 0.1 μm or less, butyl carbitol acetate is added, and the viscosity is measured with an E (complate) type viscometer (23. 0 ± 0.1 ℃)
Was adjusted to 600P. The SP value in this state (that is, the state without the liquid release component) is 11.
It was 0.

Then, cyclohexanol (liquid release component, SP value: 11.4) was added in an amount of 10% by weight based on the total amount of the ink.
To obtain a liquid crystal color filter ink (red). The viscosity of this ink was 540P. In addition, the SP value of the liquid release component was 0.4 larger than the SP value of the ink in the state where the liquid release component was not included. (Printing test) Using the ink for a liquid crystal color filter thus obtained, printing was performed by an intaglio offset printing method. The printing conditions are as follows. Intaglio: Soda lime glass having a concave portion with a line width of 50 μm and a depth of 5 μm was used. Blanket: The one whose surface printing layer was silicone rubber was used. -Transparent substrate: Non-alkali glass ("# 7059" manufactured by Corning Incorporated) was used.・ Printing speed: Transfer speed from intaglio to blanket is 30
mm / s, transition speed from blanket to transparent substrate is 1
It was 50 mm / s. (Evaluation of Printing Characteristics) In the above printing test, the ratio (%) of the ink transferred from the intaglio to the blanket and from the blanket to the transparent substrate was measured. In addition,
The ratio (%) of the ink is determined by performing image processing on an enlarged photograph of the surface of the blanket or the transparent substrate after the transfer of the ink to determine the transfer area of the ink.
It is expressed as a percentage of the ink transfer area when In the present invention, since excellent printing characteristics are required, the transfer rate of the ink is required to be 100% (that is, the ink is completely transferred).

The results of the evaluation of the printing characteristics are shown in Table 3 below. Example 2 An ink for a liquid crystal color filter was produced in the same manner as in Example 1 except that propylene glycol (SP value = 12.6) was blended at a ratio of 1% by weight instead of cyclohexanol. The viscosity of this ink was 580P. The SP value of the liquid release component was 1.5 times larger than that of the ink without the liquid release component.

Next, a printing test was performed in the same manner as in Example 1 except that this ink was used. Example 3 Instead of cyclohexanol, ethylene glycol (S
P value = 14.2) in a proportion of 1% by weight,
In the same manner as in Example 1, a liquid crystal color filter ink was manufactured. The viscosity of this ink was 520P. In addition,
The SP value of the above-mentioned liquid release component was 3.2 larger than the SP value of the ink in a state where the liquid release component was not contained.

Next, a printing test was performed in the same manner as in Example 1 except that this ink was used. Comparative Example 1 An ink for a liquid crystal color filter was produced in the same manner as in Example 1 except that cyclohexanol (liquid release component) was not blended. The viscosity of this ink was 600P.

Next, a printing test was performed in the same manner as in Example 1 except that this ink was used. Comparative Example 2 Instead of cyclohexanol, methanol (SP value = 1)
Example 1 was repeated except that 4.8) was added at a ratio of 5% by weight.
In the same manner as in the above, an ink for a liquid crystal color filter was produced.
The viscosity of this ink was 600P. The SP value of the liquid release component was 3.8 higher than the SP value of the ink without the liquid release component.

Next, a printing test was performed in the same manner as in Example 1 except that this ink was used. Examples 1 to 3 above
Table 3 shows the results of the printing test for Comparative Examples 1 and 2.

[0045]

[Table 3]

As is clear from Table 3, Examples 1 to 3 containing an organic solvent (liquid release component) having a predetermined SP value were used.
In No. 3, complete transfer of the ink was realized both in the transfer of the ink from the intaglio to the blanket and in the transfer of the ink from the blanket to the transparent substrate. On the other hand, in Comparative Example 2, the ink and the liquid release component were separated at the time of filling the ink into the intaglio recess, and the ink could not be sufficiently filled in the intaglio recess. In Comparative Example 1, the transfer of the ink from the intaglio to the blanket was insufficient as in the related art.

Example 4 A colorant, a solvent and a dispersant were mixed together with the polyester-melamine resin obtained in the above Reference Example at the compounding amounts (parts by weight) shown in Table 4, and were mixed with a planetary mixer (described above). Mixing.

[0048]

[Table 4]

After the premixing, the polyester-melamine resin was finely pulverized with a ball mill until the average particle diameter became 0.1 μm or less, and butyl carbitol acetate was added to adjust the viscosity to 650P. The SP value in this state (without the liquid release component) was 10.5.
Met. Then, cyclohexanol (liquid release component, SP value: 11.4) was added in an amount of 10% by weight based on the total amount of the ink.
To obtain a liquid crystal color filter ink (green). The viscosity of this ink was 560P. In addition, the SP value of the liquid release component was 0.9 larger than the SP value of the ink without the liquid release component.

A printing test was performed in the same manner as in Example 1 except that the above-mentioned ink for a liquid crystal color filter was used. Example 5 A colorant, a solvent, and a dispersant were mixed together with the polyester-melamine resin obtained in the above Reference Example at the compounding amounts (parts by weight) shown in Table 5, and premixed with a planetary mixer (described above).

[0051]

[Table 5]

After the premixing, the polyester-melamine resin was finely pulverized with a ball mill until the average particle size became 0.1 μm or less, and butyl carbitol acetate was added to adjust the viscosity to 600P. The SP value in this state (without the liquid release component) was 10.5.
Met. Then, propylene glycol (liquid release component, SP value 12.6) was blended at a ratio of 1% by weight based on the total amount of the ink, and an ink for a liquid crystal color filter (blue) was used.
I got The viscosity of this ink was 590P. In addition,
The SP value of the liquid release component was 2.1 greater than the SP value of the ink in the state where the liquid release component was not contained.

A printing test was performed in the same manner as in Example 1 except that the above-described ink for a liquid crystal color filter was used. Table 6 shows the results of the printing test for Examples 4 and 5.

[0054]

[Table 6]

As is clear from Table 6, in Examples 4 and 5, in both the transfer of the ink from the intaglio to the blanket and the transfer of the ink from the blanket to the transparent substrate,
Complete transfer of ink was achieved. Example 6 An ink (red) for a liquid crystal color filter was produced in the same manner as in Example 1, except that cyclohexane (SP value = 8.25) was blended in a ratio of 10% by weight instead of cyclohexanol. The viscosity of this ink was 560P. Note that the SP value of the liquid release component was 2.75 smaller than the SP value of the ink in a state where the liquid release component was not included.

Using the ink for a liquid crystal color filter thus obtained, a printing test was performed by an intaglio offset printing method. The printing conditions are as follows. Intaglio: Soda lime glass coated with silicone resin (a mixture of the main agent “KS778” manufactured by Shin-Etsu Chemical Co., Ltd. and the curing agent “CAT PL8” at a weight ratio of 100: 1). And line width 50μ
m and a concave part having a depth of 5 μm were used. Blanket and transparent substrate: The same one as in Example 1 was used. Printing speed: Same as in Example 1.

Next, the printing characteristics were evaluated in the same manner as in Example 1. Example 7 Instead of cyclohexanol, toluene (SP value = 8.
Ink (green) for a liquid crystal color filter was produced in the same manner as in Example 4, except that 9) was added at a ratio of 5% by weight. The viscosity of this ink was 620P. In addition,
The SP value of the above-mentioned liquid release component was 1.6 smaller than the SP value of the ink in a state where the liquid release component was not contained.

Next, a printing test was performed in the same manner as in Example 6 except that this ink was used. Example 8 A colorant, a solvent and a dispersant were mixed together with the polyester-melamine resin obtained in the above Reference Example in the amounts (parts by weight) shown in Table 2 above, and a planetary mixer (described above) was used.
Was premixed.

After the premixing, the polyester-melamine resin was finely pulverized with a ball mill until the average particle diameter became 0.1 μm or less, and butyl carbitol acetate was added to adjust the viscosity to 620P. The SP value in this state (without the liquid release component) was 11.0.
Met. Then, ethyl cellosolve (ethylene glycol monoethyl ether, liquid release component, SP value 9.
9) is blended at a ratio of 10% by weight to the total amount of the ink,
A liquid crystal color filter ink (red) was obtained. The viscosity of this ink was 580P. Note that the SP value of the liquid release component was 1.1 smaller than the SP value of the ink in a state where the liquid release component was not included.

A printing test was performed in the same manner as in Example 6, except that the above-mentioned ink for a liquid crystal color filter was used. Comparative Example 3 Instead of cyclohexanol, n-hexane (SP value =
Ink for liquid crystal color filter (red) in the same manner as in Example 1 except that 7.2) was blended at a ratio of 10% by weight.
Was manufactured. The viscosity of this ink was 580P. In addition, the SP value of the liquid release component was 3.8 smaller than the SP value of the ink in the state where the liquid release component was not included.

Next, a printing test was performed in the same manner as in Example 6 except that this ink was used. Table 7 shows the results of the printing tests for Examples 6 to 8 and Comparative Example 3.

[0062]

[Table 7]

As is apparent from Table 7, even when the SP value of the liquid release component is smaller than the SP value of the ink in a state where the liquid release component is not contained, the difference between the two SP values is small. In Examples 6 to 8 within the predetermined range, complete transfer of the ink was realized both in the transfer of the ink from the intaglio to the blanket and in the transfer of the ink from the blanket to the transparent substrate.

On the other hand, in Comparative Example 3, since the difference between the two SP values exceeded a predetermined range, the ink and the liquid release component were separated at the time of filling the ink into the intaglio recess, and the Could not be sufficiently filled with ink.

[0065]

As described in detail above, according to the ink for a liquid crystal color filter of the present invention, a piling does not occur, and a coating film having excellent printing characteristics and excellent heat resistance can be formed. Also, by using such an ink, a liquid crystal color filter having excellent image quality and excellent heat resistance can be obtained.

Claims (3)

[Claims] 1. An ink for a liquid crystal color filter comprising a resin, a colorant and a liquid release component, wherein the liquid release component is composed of an organic solvent, and has an SP value and does not contain the liquid release component. The ink for a liquid crystal color filter, wherein a difference from an SP value of the ink in a state is 0.3 to 3.5. 2. The liquid crystal color filter ink according to claim 1, wherein the content of the liquid release component is 1 to 10% by weight based on the total amount of the liquid crystal color filter ink. 3. A method for producing a liquid crystal color filter, characterized in that the ink for a liquid crystal color filter according to claim 1 is filled in a concave portion of an intaglio plate, and then the ink is transferred to a blanket, and further transferred from the blanket to a transparent substrate. Method.