JP2000258621A - Production of color filter and colored composition for color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a color filter having high resolution, excellent in transparency and excellent also in light resistance. SOLUTION: A dispersion solution of pigment particles coated with a thermoplastic resin is applied to a transparent filter substrate, recording is carried out with heat of laser and pigment colored particles in the unrecorded part are removed to produce the objective color filter. The objective colored composition for a color filter contains a pigment coated with a self-water-dispersive resin obtained by neutralizing at least part of a thermoplastic resin having an acid value with a volatile base and dispersed in a dispersive medium.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for producing a color filter and a coloring composition for a color filter.

[0002]

2. Description of the Related Art Color filters for display devices such as liquid crystals are
R on a transparent substrate having a transparent conductive film (ITO) pattern
(Red-red), G (Green-green), B (Blue)
-Blue) and a so-called black matrix that separates the three primary color pixel patterns from the three primary colors.

As a method of forming a black matrix or a three-primary-color pixel pattern, a method of obtaining a pattern formed by a photolithographic method by dyeing and an electrodeposition method using a patterned electrode are known. As a coloring material, a dye can provide a filter with high transparency, but has poor durability such as light fastness, while a pigment has the disadvantage that the filter's optical performance (transparency and color purity) is poor due to dispersibility. Was.

A dyeing method and a colored resin method for forming a colored pattern using a photosensitive resin which has been conventionally used can obtain a high-precision filter pattern. However, in the dyeing method, the dyeing process is complicated and the resin coloring is difficult. According to the method, the dispersion stability of the dispersed pigment is poor, and in order to efficiently photo-cure the photosensitive resin, it is necessary to devise a device such as oxygen shielding.

As a low-cost manufacturing method, a conventional printing method using a printing plate, an ink-jet method, and the like are known. However, it is necessary to take measures to prevent the spread of pixels at the time of printing and to improve the pattern accuracy. .

Specifically, Japanese Patent Application Laid-Open No. S59-75205 proposes a method of printing a light transmitting portion with a diffusion prevention pattern having poor wettability and a dye made of a material having good wettability using an ink jet method. However, color pattern printing with sufficient accuracy could not be obtained.

Japanese Unexamined Patent Publication (Kokai) No. 62-106407 proposes an ink which hardly wets a partition wall as an ink. However, similarly, the disclosed content is insufficient for printing a color pattern with sufficient accuracy. .

In the above prior art method, depending on the combination of the partition pattern (black matrix) and the printing ink, printing accuracy due to bleeding is insufficient, defective pixels due to partial insufficient wetting of the ink, or the like. Ink jet recording has a drawback that it is difficult to always accurately and accurately apply ink to a predetermined location of a black matrix.

In a manufacturing method using an electrophotographic method,
This is not always an effective means due to stable formation of an electrostatic latent image, uneven development and fixing with toner, and the like.

[0010]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is that a high precision black matrix pattern and an RG surrounded by a black matrix pattern partition.
An object of the present invention is to provide a method for producing a color filter excellent in resolution, optical performance, and durability (light resistance) for a B pattern, and a coloring composition for a color filter.

[0011]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have accomplished the present invention.

That is, the present invention provides the following color filter manufacturing method to solve the above-mentioned problems.

(1) At least a step 1 of applying a pigment particle dispersion liquid coated with a thermoplastic resin to a transparent filter substrate, and a step 2 of recording by heat of a laser.
And a step 3 for removing pigment-colored particles. (2) A coloring composition for a color filter, wherein the pigment is a dispersion dispersed in a dispersion medium, wherein the pigment is coated with a self-water dispersible resin obtained by neutralizing at least a part of a thermoplastic resin having an acid value with a volatile base. object.

The present invention is characterized by including the above steps (1) to (3) as essential. These steps are generally performed in the order of step 1, step 2, and step 3.

In the present invention, pigment particles coated with a thermoplastic resin are hereinafter abbreviated as pigment-colored particles. Step 1 is a step of applying a dispersion of pigment-colored particles to a transparent filter substrate. The most characteristic feature here is that a dispersion of pigment-colored particles is used.

As the thermoplastic resin constituting the pigment-colored particles, those which can be dispersed in a liquid medium as a dispersion medium, for example, known resins such as polyester resin, petroleum resin, polyurethane resin, styrene resin and acrylic resin are used. It is possible. In addition, as the dispersion medium, known and commonly used ones such as an organic solvent and water can be used. The weight ratio between the pigment and the thermoplastic resin in the pigment-colored particles dispersed in the dispersion liquid is not particularly limited. However, in order to ensure good adhesion to the transparent filter substrate described below, usually, the weight ratio per 100 parts by weight of the pigment is 5 to 300 parts by weight of the thermoplastic resin,
It is preferred that the amount be up to 120 parts by weight. A preferred dispersion of the pigmented particles will be described later in detail.

As the filter substrate to which the dispersion is to be applied, any known and transparent one which is insoluble in the dispersion and transparent can be used. For example, a glass plate of quartz or a plastic plate of PET or the like can be used. No. It is desirable that these transparent filter substrates are extremely smooth.

In this way, the dispersion is applied to the transparent filter substrate, and the application is performed so as to be uniform. This coating can be performed, for example, using black matrix and / or RGB.
It can be applied so as to correspond to the pixel pattern.
In step 2 described below, a black matrix or RGB
It is more preferable to irradiate a laser so as to correspond to the pixels, record the pattern by the heat, and remove the pigment-colored particles in the unrecorded portion in step 3. At this time, R
In the case of the GB pixel pattern, the same operation is repeated for each color pixel pattern.

The dispersion liquid of the pigment particles coated with the thermoplastic resin applied to the transparent filter substrate in the step 1 can be directly irradiated with laser according to the step 2 as it is. The removal can be performed after removing the medium.

According to the method for producing a color filter of the present invention, the form of energy applied to the coating layer by the dispersion of the pigment-colored particles is such that the thermoplastic resin contained in the pigment-colored particles is selectively fused by irradiation to achieve high definition. Since it is extremely easy to form the above pattern, convergent light is preferable, and laser light (heat mode) that can directly draw a fine pattern without contact is most preferable.

The particle size of the pigment colored particles used for forming the pattern of the black matrix and the RGB pixels is not particularly limited, and is usually 1 μm or less, preferably 0.001 to 0.005, depending on the forming method and the forming order. It is selected from the range of 1 μm.

For example, when an RGB pixel pattern is formed after a black matrix is formed in advance, the pigment-colored particles used for forming the black matrix have a particle size of 1 μm or less, especially 0 μm, in terms of resolution and light blocking properties. .0
5 to 1 μm is preferred. The pigment-colored particles used for forming the RGB pixel pattern preferably have a particle size of 1 μm or less, particularly 0.01 to 0.5 μm, in terms of light transmittance.

In step 2, the pigment-colored particles in the portion irradiated with the laser beam are fused to form a colored image, and the unrecorded portions of the pigment-colored particles are removed by development in step 3 to be described later. When the pigment contained in the colored particles is a black pigment, an organic pigment of an RGB color is used as a pigment contained in the pigment colored particles of each color on a black matrix, on a filter substrate on which the black matrix is formed by the present invention or another method. Is used, a color filter can be obtained by repeating coating, recording and development for each color.

The laser light source used in the present invention is specifically a semiconductor laser (oscillation wavelength 780 nm / 840).
nm), carbon dioxide laser (10.6 μm), YAG
Laser (532/1060 nm), excimer laser (193.308.351 nm) and argon laser (488 nm).

The laser irradiation may be carried out under such a control that the temperature is raised to a temperature at which the pigment-colored particles fuse with each other by heat and that the pigment-colored particle layer is not etched.

The laser beam is irradiated from the transparent filter substrate side through the substrate or directly from the coating side.
Can be performed from any convenient side. Of course,
It may be performed from both sides, or simultaneously from both sides,
Irradiation with laser light is also possible.

In the step 3, the unfixed portion which is not irradiated with the laser other than the portion fixed to the substrate by fusion of the pigment colored particles performed in the step 2 is removed. The development removal operation includes wet development in addition to removal of unfixed particles by air, and both can be combined. In the case where the pigment is pigment-colored particles coated with a self-water-dispersible resin obtained by neutralizing at least a part of a thermoplastic resin having an acid value with a volatile base, laser irradiation was performed by the operation of Step 2. The part is heated up and the base volatilizes, forming a lipophilic film at the same time as the fusion, while the unirradiated part is hydrophilic,
Selective development is possible using water or a water-soluble developer containing a weak base, a water-soluble organic solvent, a surfactant, or the like.

Next, the dispersion of pigment-colored particles will be described. The dispersion of the black pigment coated with the thermoplastic resin can be used for forming a black matrix pattern. Each dispersion liquid of the RGB organic pigments coated with the thermoplastic resin can be used for forming an RGB pixel pattern.

According to the present invention, a dispersion of pigment particles coated with a thermoplastic resin, whether for forming a pattern of a black matrix or for forming a pattern of RGB pixels, can be easily formed into a high-definition liquid according to the production method of the present invention. The pigment is a dispersion in which the pigment is coated with a self-water-dispersible resin in which at least a part of the thermoplastic resin having an acid value is neutralized with a volatile base, and is dispersed in a dispersion medium. Some can be suitably used as a coloring composition for a color filter. Here, it is preferable that the dispersion medium of the dispersion liquid is water alone or water as a main component in terms of working environment and less fear of fire.

A self-water-dispersible resin obtained by neutralizing at least a part of a thermoplastic resin having an acid value with a volatile base is:
At the same time as the dispersion medium is removed, the volatile base that neutralized the acid group, which is the origin of the acid value of the thermoplastic resin, also volatilizes and hardly remains. Is likely to be excellent and is preferred.

In the present invention, for use as a dispersion of pigment-colored particles, a copolymer of (meth) acrylic acid with at least one monomer selected from the group consisting of styrene, substituted styrene and (meth) acrylic acid ester is used. The polymer can provide a pigmented particle dispersion with excellent stability.

When the dispersion of the pigmented particles is an aqueous dispersion, the self-water-dispersible resin is obtained by substituting a salt of a thermoplastic resin having an acid value with a basic substance or a hydrophilic group such as a hydroxyl group. The resin has an acid value of 10 or more and 280 or less in order to make the water-dispersible pigmented colored particles finer, and to impart large hydrophilicity to the particles while preventing dissolution and swelling of the particles. It is preferable that the thermoplastic resin is a self-water dispersible resin obtained by neutralizing at least a part of the thermoplastic resin with a base.

In particular, in order to prevent fusion of the resin particles and to easily separate the resin particles by development, the glass transition temperature of the resin is preferably 50 ° C. or more, more preferably 70 to 70 ° C.
The glass transition temperature at 150 ° C. in a range that does not hinder the thermal fusion of the pigment-colored particles by laser light irradiation is good.

In order to improve the resolution of the colored portion, the particle size of the resin particles is made smaller, and in order to increase the hydrophilicity of the unfused resin particles in the non-colored portion and to enhance the developability, the thermoplastic resin is used. 40 mol% or more of acid groups, preferably 40 to 120 mol%
Is preferably neutralized with a base.

The anionic functional group that gives the thermoplastic resin an acid value is not particularly limited, for example, a carboxyl group, a sulfonic acid group, a sulfinic acid group, and the like. And lipophilicity of the fused film after laser irradiation.

The type of the resin of the self-water dispersible resin particles is not particularly limited. Acrylates such as substituted styrene, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, methacrylic acid A copolymer containing at least one monomer unit selected from methacrylic acid esters such as 2-ethylhexyl and at least one monomer unit selected from acrylic acid and methacrylic acid is preferable. No limit, but more than 1000 Those 0 10,000 or less molecular weight is more preferable.

The base used for neutralizing the thermoplastic resin having an acid value to make it self-dispersible in water is preferably volatile, and the volatile base is particularly preferably ammonia or an organic amine.

Here, at least a part of the self-water dispersible resin obtained by neutralizing at least a part of the thermoplastic resin having an acid value with a volatile base is a thermoplastic resin having an acid value. A more durable colored portion can be obtained by cross-linking between molecules.

There are, for example, the following two methods for forming such a state of intermolecular crosslinking. (1) A thermoplastic resin having an acid value and a compound capable of permanently crosslinking the resin by a covalent bond are used in combination.

(2) A thermoplastic resin which is obtained by reacting a thermoplastic resin having an acid value with a polyvalent metal compound capable of reversibly crosslinking the resin by an ionic bond is used, the crosslinking of which is dissociated by heating.

As the cross-linking agent, a compound corresponding to the above (1) includes, for example, a compound capable of permanently cross-linking the resin by a covalent bond. For example, known crosslinking agents such as polyepoxy compounds, oxazoline compounds (compounds containing an oxazoline group in the chemical structure), and polyisocyanate compounds can be used. However, these covalently cross-linking agents reduce the thermoplasticity of the resin.
It is preferable to keep the partial cross-linking of 1 to 30 mol%, especially 1 to 10 mol%.

By containing a thermoplastic resin having an acid value and the above-mentioned crosslinkable compound in the dispersion, the thermoplastic resin is crosslinked with the crosslinkable component without lowering the melting temperature of the thermoplastic resin by the heat of the laser. As a result, the thermal and mechanical strengths are improved, and a colored portion having more excellent durability can be obtained.

On the other hand, in a similar manner to the above (2), at least a part of the total amount of the functional groups imparting an acid value in the thermoplastic resin is intermolecularly crosslinked via a polyvalent metal ion.
Since a so-called ionomer resin does not reduce the thermoplasticity of the thermoplastic resin, the pigmented particles are easily fused by the heat of the laser to provide excellent durability and adhesion to the substrate.

An ionomer resin is different from a covalent crosslink which forms a permanent gel having a permanently crosslinked network structure, and is different from a polyvalent metal ion and an anionic group which form a reversible gel having a network structure consisting of reversible crosslinks. It is a chelating resin by ionic bonding. This resin behaves as in the case of permanent cross-linking at around normal temperature, but when heated, ionic bonds dissociate and behave as a thermoplastic resin before cross-linking. The resin particles and the heat-fused resin film obtained from the aqueous dispersion are extremely tough and rich in elasticity, and have excellent adhesion to the substrate. Reversible crosslinking means that even if the crosslinking ratio is high, good thermoplasticity is exhibited because the ionic bond energy is small compared to the covalent bond energy.

The valence of the polyvalent metal ion used in the ionomer resin may be any number as long as it is 2 or more, but is preferably 2 or 3, particularly preferably aluminum ion or aluminum ion in order not to deteriorate the electrical characteristics. Those having a valence of 3 or more, such as titanium ions and zirconium ions, and in which the resin particles are colorless, less toxic, tough, and exhibit good thermoplasticity are preferred.

Crosslinking of the resin with these polyvalent metal ions preferably results in gelling of the thermoplastic resin when crosslinked with an amount of polyvalent metal ions corresponding to 1% to 30% of the anionic functional groups. A small and stable ionomer resin aqueous dispersion can be obtained, and there is little decrease in the thermal fluidity of the resin particles.

Of course, the methods (1) and (2) can be used together.

The pigment of the present invention preferably has good spectral characteristics, light fastness, particle size and dispersibility.
Examples of the black pigment include carbon black, graphite, titanium black, platinum black, and perylene pigment, and carbon black is preferred in terms of cost.

The color pigments include organic pigments of each color of RGB, and the red color includes perylene pigments, lake pigments, azo pigments, quinacridone pigments, anthraquinone pigments and the like. I. Pigment Red 9, 9
7, 102, 122, 123, 149, 168, 17
7, 179, 180, 192, 215, 224, etc., green is a halogen polysubstituted (copper) phthalocyanine pigment,
Specifically, C.I. I. Pigment Green 7, 36, and blue are copper phthalocyanine pigments, indanthrone-based pigments, cyanine pigments, and the like. I. Pigment Blue 15, 15: 1, 15: 2, 15: 3, 15:
4,15: 6,22,60,64. Other examples include yellow pigments for toning such as isoindoline, disazo, isoindolinone, and acetolone pigments. I. Pigment Yellow 83, 109, 11
0, 139, 154, etc., such as dioxazine pigments as violet pigments; I. Pigment Violet 23, 37 and the like.

As a dispersion in the present invention, a pigment is coated with a self-water dispersible resin obtained by neutralizing at least a part of a thermoplastic resin having an acid value with a volatile base,
When a dispersion dispersed in a dispersion medium is employed, the self-water-dispersible pigment-colored particles may be formed by a known resin emulsification method, and specific examples include the following two methods.

First, in the so-called phase inversion emulsification method, specifically, as a first step, at least a resin and a pigment which can become self-water dispersible by neutralization are kneaded in an organic solvent, and then a predetermined amount of neutralization is carried out. Mix the base. In the second step, emulsification is performed by mixing an excess amount of an aqueous medium with the colored resin solution obtained in the first step to obtain an aqueous dispersion of pigment-colored particles.

As a third step, a desolvation step of removing the organic solvent used in the first step may be included as a third step in order to enhance the dispersion stability of the pigment-colored particle dispersion. After the completion of the second or third step, large pigment pigment particles and large resin particles are removed by filtering or centrifuging to keep the particle size distribution constant or narrow. It is preferable to perform the step of

Examples of the organic solvent which dissolves the thermoplastic resin in the first step include ketone solvents such as acetone, dimethyl ketone and methyl ethyl ketone, alcohol solvents such as methanol, ethanol and isopropyl alcohol, chloroform, methylene chloride and the like. Chlorine solvents, aromatic solvents such as benzene and toluene, ester solvents such as ethyl acetate, glycol ether solvents such as ethylene glycol monomethyl ether and ethylene glycol dimethyl ether, and resins that dissolve resins such as amides Although it is possible, when the resin component is a styrene resin or a (meth) acrylic resin, at least one combination selected from a ketone solvent and an alcohol solvent is preferable.

The amount of the organic solvent used is not particularly limited as long as the effects of the present invention are achieved, but is preferably such that the weight ratio of the thermoplastic resin to the organic solvent is 1/1 to 1/20.

Next, in a method called suspension reprecipitation method,
Specifically, an aqueous dispersion of colored resin particles is obtained in the following steps.

(1) A resin coloring step of dispersing at least a pigment in a thermoplastic resin having an acid value to obtain a solid coloring compound. (2) At least water, an organic solvent that dissolves the thermoplastic resin, a base, and the solid coloring compound obtained in the resin coloring step are mixed, and the pigment suspension in which at least a part of the resin is dissolved by dispersion is mixed. The resulting suspension step. (3) A reprecipitation step of depositing a dissolved resin component on the surface of the pigment in the pigment suspension obtained in the suspension step.

The resin coloring step (1) is a step of dispersing at least a pigment in a thermoplastic resin having an acid value to obtain a solid coloring compound. In this step, the pigment is uniformly dispersed in a thermoplastic resin having an acid value by using a kneading device such as a roll, a kneader, or a bead mill, which is conventionally known, in a solution or a heated and melted state. By removing the mixture as a solid kneaded material (solid colored compound).

As means for dispersing the pigment, it is preferable to employ a dispersing means which forms a state where a relatively high shearing force is applied among conventionally known dispersing methods, and perform the dispersion under a high shearing force. . Such preferred means include:
It is preferable to use this roll.

In the suspension step (2) of the present method, at least water, an organic solvent that dissolves the thermoplastic resin, a base, and the solid coloring compound obtained in the resin coloring step are mixed, and at least the resin is dispersed by dispersion. This is a step of obtaining a partially dissolved pigment suspension.

The solid coloring compound obtained in the resin coloring step (1) is added uniformly to a mixed solvent in which water, an organic solvent dissolving a thermoplastic resin having an acid value, and a base are essential as a dispersion medium. By stirring to disperse,
From the surface of the solid colored compound, a film-forming resin having an acid value including a pigment is formed with the help of an organic solvent and a base.
The pigment is dissolved or self-emulsified, and in each case, a pigment suspension in which at least a part of the resin is dissolved is obtained.

By this step, the thermoplastic resin having an acid value, which is present on the surface of the solid colored compound, is gradually neutralized at least partially or entirely with the base by the base, and the solid form of the compound is solidified. Therefore, the mixture is in a suspended state.

When the resin is completely dissolved in the liquid medium, the surface of the pigment is exposed. When the resin is self-emulsified, at least the pigment in the suspension is exposed. It is considered that a part of the surface is covered with the resin.

As a stirring method for obtaining a suspension, any known and commonly used method can be adopted. For example, in addition to a conventional uniaxial propeller-type stirring blade, a stirring blade having a shape suitable for the purpose or a stirring blade may be used. It can be easily suspended using a container.

In order to obtain a suspension, there is no or relatively small shearing force, simple mixing and stirring, or if the pigment is relatively easy to aggregate, in addition to this, and then under high shearing force , The dispersion may be further stabilized. As a dispersing machine in this case, it is preferable to use a high-pressure homogenizer, a beadless dispersing machine known under the trade name of Microfluidizer or Nanomizer, etc., since reagglomeration of the pigment is small.

The reprecipitation step (3) of the present method is a step of depositing the dissolved resin component on the surface of the pigment in the pigment suspension obtained in the suspension step. In the present method, “re-precipitation” does not mean that the pigment or the pigment in which the dissolved resin is adsorbed on the pigment surface is separated and settled from the liquid medium of the suspension.

The deposition of the dissolved resin on the pigment surface in the pigment suspension in the suspension step (2) can be performed, for example, by adding the resin to the pigment suspension in which the resin is dissolved at least partially. This can be easily carried out by adding water or an aqueous medium that functions as a poor solvent, and / or by removing the organic solvent from the pigment suspension.

As described above, in (3), colored resin particles having a desired particle size can be obtained, but the average particle size range is usually 0.01 to 20 μm.

The crosslinking of the resin with the crosslinking agent can be achieved by adding a crosslinking agent to any of the above steps to form colored resin particles and then heating the dispersion.

The ionic crosslinking of the resin of the pigment-colored particles is carried out by adding the polyvalent metal ion as a metal or a soluble polyvalent metal salt to the resin solution in the phase inversion emulsification method or the kneading step or the suspension step in the suspension reprecipitation method. Is done.

Those selected from a ligand such as a polyvalent metal carboxylate, acetylacetone, acetoacetate and the like and a polyvalent metal chelate are preferable in terms of availability and solubility in organic solvents. When these soluble metal salts are added to a synthetic resin solution, the solubility of the resin decreases due to crosslinking, resulting in gelation and an increase in the particle size of the resin emulsion. In this case, raise the liquid temperature or use acetylacetone or acetoacetate ester. By adding an excessive amount of a volatile chelating agent such as described above, gelation can be prevented and a resin emulsion having a fine particle size can be obtained.

The pigment-colored particle dispersion thus obtained can be used as it is, but since the colored resin particles are in a swollen state due to the effect of the coexisting organic solvent, the storage stability is further improved. In order to further increase the safety against fire and pollution, or further, a deorganizing solvent can be further used.

The above-mentioned thermoplastic resin solution may contain, as additives, dispersants, plasticizers, antioxidants, ultraviolet absorbers, and energy absorbers for efficiently absorbing the heat energy of the irradiating laser. Etc. can be added.

When a compound that causes crosslinking with the resin is added at the same time that the pigment-colored particles are thermally fused by a laser, a filter having extremely high heat resistance can be obtained. That is,
The aqueous dispersion of pigmented resin particles contained in the thermoplastic resin having an acid group of the present invention contains a compound capable of crosslinking with the thermoplastic resin as a crosslinking agent.

As described in detail above, known crosslinking agents can be used, but those soluble in the dispersion medium react with the resin in a relatively short time to generate coarse particles. Preferably, the addition of a dispersible polymer, specifically, a polymer having a water-dispersible oxazoline group is preferred.

The aqueous medium mixed with the above-mentioned thermoplastic resin solution is preferably water of a grade equal to or higher than ion-exchanged water in order to avoid the influence of impurities and metal ions.

The particle layer of the pigment-colored particles having self-water dispersibility may be used in combination with a particle adhesion inhibitor. The particle adhesion inhibitor is not particularly limited. Examples thereof include ethylene glycol and diethylene glycol. , Polyethylene glycol, polyhydric alcohols such as glycerin,
Examples include inorganic fine particles such as colloidal silica, and a surfactant.

The self-water dispersible pigment-colored particle dispersion may contain, as additives, the above-mentioned particle adhesion inhibitor, preservative, laser light-activated particle crosslinking agent, and the like.

The development (removal) of the unfused pigmented color particles used in the color filter manufacturing method of the present invention is mainly composed of water or water, and if necessary, an alkali agent, a water-soluble organic solvent, a surfactant, etc. Can be carried out using a developer containing the above-mentioned additive.

The method of manufacturing a color filter according to the present invention relates to a part of a method of coloring a color filter, and does not prevent a conventional process of manufacturing a color filter before and after the steps of the manufacturing method. The black matrix and the RGB pixels obtained by the present invention correspond to a part of the whole forming a color filter.

Specifically, for example, the following operation can be performed. A step of applying a dispersion of black pigment particles coated with a thermoplastic resin to a transparent filter substrate; a step of fusing the thermoplastic resin by heat of a laser to record a pattern corresponding to a black matrix; Removing a portion of the pigmented particles, applying a dispersion of each of the organic pigment particles of RGB coated with a thermoplastic resin to a filter substrate, fusing the thermoplastic resin with the heat of a laser, and applying the same to each of the RGB pixels. The method includes a step of recording a corresponding pattern, and a step of removing each of the uncolored portions of the pigmented particles of RGB. By performing these steps in this order, a component for a color filter can be manufactured.

The color filter component obtained in this way is, for example, then covered with a protective film over the black matrix and the RGB pixels, and provided with a transparent conductive film on the protective film. You can do it.

The coloring composition for a color filter of the present invention can be applied as a coloring material in a known color filter manufacturing method such as an electrodeposition method, a resin coloring method and a printing method.

[0083]

BEST MODE FOR CARRYING OUT THE INVENTION The preferred embodiment of the present invention will be described below by taking as an example the case of manufacturing by a phase inversion emulsification method.

A thermoplastic resin having an acid value of 10 or more and 280 or less and a glass transition temperature of 50 ° C. or more, particularly preferably a part of the thermoplastic resin, is intermolecularly crosslinked via a polyvalent metal ion to form an integrated structure. After dissolving the ionomer resin in an organic solvent, a lower amine of 40 mol% or more of the acid groups of the thermoplastic resin is further mixed.

After adding the pigment to the resin solution and dispersing the pigment with a dispersing machine, emulsification is carried out by mixing an excess amount of an aqueous medium containing ethylene glycol as a particle adhesion inhibitor, and if necessary, a crosslinking agent. Is added to the mixture to further adjust the pigment concentration and the additives, and then each large-diameter particle is removed by filtration with a filter or centrifugation to obtain a self-water-dispersible dispersion of pigmented particles.

The obtained self-water-dispersible pigment-colored particle dispersion is applied on the surface of a transparent color filter substrate, and an excess of water and a low-boiling organic solvent is removed to form a uniform coating film. The temperature is raised by a laser beam to a temperature at which the resin is fused and converted to a lipophilic resin, and the resin is fixed to the substrate. Next, the non-irradiated portion of the laser beam is developed using a developer such as water to remove unfused pigment colored particles. By performing the above operation for each color, a color filter can be obtained.

[0087]

Next, the present invention will be described more specifically with reference to examples and comparative examples. In addition, "part" in the following examples
Represents "parts by weight".

(Example 1) Styrene acrylate resin (styrene / acrylic acid / 2-ethylhexyl acrylate = 77/13/10; acid value 100; molecular weight 40,000)
0 parts, 10 parts of carbon black, 6 parts of acetylacetonatoaluminum (an amount corresponding to a cross-linking rate of 9%), and 50 parts of methyl ethyl ketone were added to glass beads 15 having a diameter of 0.2 mm.
The mixture was dispersed for 4 hours using a paint shaker together with 0 parts.

To 76 parts of the dispersion excluding the glass beads, 40 parts of methyl ethyl ketone and 40 parts of isopropyl alcohol
And 4 parts of triethylamine (an amount equivalent to a resin neutralization rate of 60%), and a mixture of 420 parts of ion-exchanged water was dropped at a rate of 5 ml / min with stirring to obtain a particle diameter of 0.1 μm.
After obtaining an aqueous dispersion containing the pigment-colored particles of the above, 5 parts of a water-dispersible oxazoline polymer (Epocross K-1030E manufactured by Nippon Shokubai, nonvolatile content of 40% by mass) is further added as a crosslinking agent, and the mixture is heated at 60 ° C. for 5 hours. After that, the mixture was concentrated so that the pigment concentration became 20%, 5% of propylene glycol propyl ether was added, and the mixture was stirred. Then, the mixture was filtered using a 0.5 μm membrane filter to obtain a particle diameter of 0.1 μm.
A final black pigment colored particle dispersion containing a permanently crosslinked portion was obtained.

The obtained final dispersion of black pigment-colored particles is coated on a transparent substrate for a color filter, air-dried at 40 ° C., irradiated with a laser using an irradiation device equipped with a semiconductor laser element, and heat-fixed to form a black matrix. A pattern is formed, and the unirradiated part is washed away with pure water spray,
Finally, the substrate was heated at 150 ° C. for 1 hour in a vacuum to obtain a substrate on which a black matrix filter was formed.

Example 2 Pigment C.I. I. Pigment Blue 15: 6 (40 parts) and a styrene acrylic resin (styrene / acrylic acid / ethyl 2-ethylhexyl acrylate = 77/13/10; acid value 100; molecular weight 40,000) kneaded with a double-roll kneaded product were mixed with water. In a mixed solution of 250 parts, 16 parts of triethylamine (equivalent to a resin neutralization rate of 60%), 90 parts of methyl ethyl ketone, and 40 parts of isopropyl alcohol, the mixture is stirred at room temperature for 3 hours to dissolve the kneaded material. Using a Nanomizer (manufactured by Nanomizer), dispersion was performed at a pressure of 98 MPa to obtain a blue pigment suspension.

While stirring the obtained pigment suspension, a mixture of 2 parts of ethylene glycol and 150 parts of water was added at a rate of 5 ml / min.
10 parts of a water-dispersible oxazoline polymer (Epocross K-1030E manufactured by Nippon Shokubai, nonvolatile content: 40% by mass) as a crosslinking agent was added, and the mixture was heated at 60 ° C. for 5 hours.
After that, the mixture was concentrated so that the pigment concentration became 15%, 5% of propylene glycol propyl ether was added, and the mixture was stirred. After that, the mixture was filtered through a 0.5 μm membrane filter. A particle dispersion was obtained.

Similarly, the pigment C.I. I. Pigment Red 177 to give a red pigment colored particle dispersion in the same manner as C.I. I. Pigment Green 36 was used to obtain a green pigment colored particle dispersion. In each dispersion, the particle diameter of the pigment-colored particles was 0.1 μm.

The pigment dispersion of blue pigment was coated on the black matrix filter substrate prepared in Example 1, and
After reducing the pressure to 000 Pa to form a coating film, using a laser device equipped with a semiconductor laser device, irradiate the laser to a predetermined blue area surrounded by a black matrix and heat fix it. After washing with excess air, blow off excess water with an air gun and dry to obtain a blue colored part.
Next, similarly, for the green and red colors, a colored portion is formed using the dispersion liquid of each color, and finally, heating is performed at 150 ° C. for 1 hour in a vacuum to obtain high resolution, no pigment aggregation, and high transparency.
A color filter component having excellent light resistance was obtained.

[0095]

According to the present invention, in the method for producing a color filter, at least a step of applying a pigment particle dispersion liquid coated with a thermoplastic resin to a transparent filter substrate, a step of recording by heat of a laser, Since the process includes the step of removing the pigmented particles in the recording portion, a particularly remarkable effect is obtained in that a color filter having high resolution, excellent transparency, and excellent light resistance can be obtained.

In the present invention, the pigment is coated with a self-water-dispersible resin obtained by neutralizing at least a part of a thermoplastic resin having an acid value with a volatile base, and is dispersed in a dispersion medium. Since a certain coloring composition is used for a color filter, it has high resolution, no pigment aggregation, and high transparency.
This has a particularly remarkable effect that a color filter having excellent durability (light resistance) can be obtained.

Claims (11)

[Claims] At least a step of applying a dispersion of pigment particles coated with a thermoplastic resin to a transparent filter substrate, a step of recording by heat of a laser, and removing unrecorded portions of pigment-colored particles. A method for manufacturing a color filter, comprising the steps of: 2. The method for producing a color filter according to claim 1, wherein a black matrix is formed by using a black pigment as a pigment. 3. The color filter according to claim 1, wherein the color filter is coated, recorded, and removed for each color on a filter substrate on which a black matrix is formed, using an RGB organic pigment as a pigment. Production method. 4. The pigment is a dispersion in which at least a part of a thermoplastic resin having an acid value is coated with a self-water-dispersible resin obtained by neutralizing with a volatile base and dispersed in a dispersion medium. Coloring composition for color filters. 5. The color filter coloring composition according to claim 4, wherein at least a part of the thermoplastic resin having an acid value is intermolecularly crosslinked by a crosslinking agent. 6. The color filter according to claim 5, wherein the thermoplastic resin having an acid value has at least a part of the amount of the functional group giving the acid value cross-linked via a polyvalent metal ion. Coloring composition. 7. The coloring composition for a color filter according to claim 4, wherein a compound capable of crosslinking with a thermoplastic resin having an acid value is contained in the dispersion. 8. The coloring composition for a color filter according to claim 7, wherein the compound capable of crosslinking with the thermoplastic resin having an acid value contains an oxazoline group in a chemical structure. 9. The thermoplastic resin having an acid value is a copolymer of (meth) acrylic acid and at least one monomer selected from the group consisting of styrene, substituted styrene, and (meth) acrylate. Item 10. A coloring composition for a color filter according to items 4 to 8. 10. The coloring composition for a color filter according to claim 4, wherein the volatile base for neutralizing the thermoplastic resin having an acid value is ammonia or an organic amine. 11. A step of applying a dispersion of black pigment particles coated with a thermoplastic resin to a transparent filter substrate,
Fusing the thermoplastic resin by the heat of a laser to record a pattern corresponding to a black matrix;
Removing the unrecorded portion of the pigmented particles, applying a dispersion of each of the pigment particles of RGB coated with a thermoplastic resin to a filter substrate, fusing the thermoplastic resin with the heat of a laser, A step of recording a pattern corresponding to a pixel, a step of removing uncolored portions of the pigmented particles of RGB, a step of covering the black matrix and the RGB pixels with a protective film, and a step of forming a transparent conductive film on the protective film. A method for manufacturing a color filter, comprising a step of providing a color filter.