JP4403304B2 - Color filter manufacturing method and color filter coloring composition - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a method for producing a color filter and a coloring composition for a color filter.
[0002]
[Prior art]
A color filter for a display element such as a liquid crystal has three primary color pixel patterns of R (Red-red), G (Green-green), and B (Blue-blue) and 3 on a transparent substrate having a transparent conductive film (ITO) pattern. It is obtained by forming a so-called black matrix that partitions the primary colors.
[0003]
As a method for forming a black matrix or a three-primary color pixel pattern, a method for obtaining a pattern formed by a conventional photolithography method by staining or a method for electrodeposition using a patterned electrode are known. As a colorant, dyes can provide highly transparent filters, but they have poor durability such as light resistance, while pigments have the disadvantage of poor filter optical performance (transparency, color purity) due to dispersibility. Was.
[0004]
Highly accurate filter patterns can be obtained by the dyeing method and colored resin method that form a colored pattern using a photosensitive resin that has been used in the past. The dispersion stability of the pigment being used is poor, and in order to efficiently photo-cure the photosensitive resin, it is necessary to devise equipment such as oxygen blocking.
[0005]
As a low-cost manufacturing method, a conventional printing method using a printing plate, an inkjet method, and the like are known. However, it is necessary to devise measures to prevent pixel spreading during printing and improve pattern accuracy.
[0006]
Specifically, Japanese Patent Application Laid-Open No. 59-75205 proposes a method of printing a light transmitting portion using an ink jet method with a dye composed of a diffusion preventing pattern having poor wettability and a material having good wettability. , Color pattern printing with sufficient accuracy could not be obtained.
[0007]
In Japanese Patent Laid-Open No. 62-106407, an ink that is difficult to wet against the partition wall is proposed as an ink. However, in the same manner, a sufficiently accurate color pattern printing is insufficient.
[0008]
In the above prior art method, depending on the combination of the partition pattern (black matrix) and the printing ink, the printing accuracy due to bleeding is insufficient, defective pixels due to partial ink wetting may occur, or in inkjet recording. Has the disadvantage that it is difficult to always accurately inject ink into a predetermined place of the black matrix.
[0009]
Also, the manufacturing method using the electrophotographic method is not necessarily an effective means due to the formation of a stable electrostatic latent image and development / fixing unevenness with toner.
[0010]
[Problems to be solved by the invention]
The problem to be solved by the present invention is that a highly accurate RGB matrix surrounded by a black matrix pattern and a black matrix pattern partition, a color filter manufacturing method and a color excellent in resolution, optical performance, and durability (light resistance) It is providing the coloring composition for filters.
[0011]
[Means for Solving the Problems]
As a result of intensive studies in order to solve the above problems, the present inventors have solved the present invention.
[0012]
That is, the present invention provides the following color filter manufacturing method in order to solve the above problems.
[0013]
(1) A color filter comprising at least a step 1 of applying a pigment particle dispersion liquid coated with a thermoplastic resin to a transparent filter substrate, a step 2 of recording with the heat of a laser, and a step 3 of removing pigment colored particles. Production method.
(2) Color composition for color filter, wherein 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 neutralization with a volatile base and dispersed in a dispersion medium object.
[0014]
The present invention is characterized by including steps 1 to 3 of (1) as essential. These steps are generally performed in the order of step 1, step 2, and step 3.
[0015]
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 pigment colored particle dispersion to the transparent filter substrate. Here, the greatest feature is to use a dispersion of pigment colored particles.
[0016]
As the thermoplastic resin constituting the pigment-colored particles, those that can be dispersed in a liquid medium as a dispersion medium, such as polyester resins, petroleum resins, polyurethane resins, styrene resins, acrylic resins, can be used. . Moreover, a well-known and usual thing as a dispersion medium, for example, an organic solvent, water, etc. can be used. The weight ratio between the pigment and the thermoplastic resin in the pigment-colored particles dispersed in the dispersion is not particularly limited, but usually, per 100 parts by weight of the pigment, in order to ensure good adhesion to the transparent filter substrate described later. The thermoplastic resin is preferably 5 to 300 parts by weight, and more preferably 80 to 120 parts by weight. A suitable dispersion of pigment colored particles will be described in detail later.
[0017]
As the filter substrate to which the dispersion liquid is to be applied, any known transparent and insoluble material that is insoluble in the dispersion liquid can be used, and examples thereof include a glass plate such as quartz and a plastic plate such as PET. These transparent filter substrates are desirably extremely smooth.
[0018]
Thus, the dispersion liquid is applied to the transparent filter substrate, and this application is performed so as to be uniform. This coating can be performed, for example, so as to correspond to a black matrix and / or RGB pixel pattern. However, a dispersion liquid is applied in advance to the entire surface of the transparent filter substrate, and in step 2 described later, the black matrix or It is preferable to irradiate the laser so as to correspond to the RGB pixels, and record the pattern by the heat so that the pigment-colored particles in the unrecorded portion are removed in Step 3. At this time, in the case of an RGB pixel pattern, the same operation is repeated for each color pixel pattern.
[0019]
In Step 1, the dispersion of pigment particles coated on the transparent filter substrate and coated with the thermoplastic resin can be directly irradiated with laser according to Step 2, but the dispersion medium of the dispersion is removed. You can also do it after that.
[0020]
According to the method for producing a color filter of the present invention, the form of energy given to the coating layer by the pigment colored particle dispersion is selectively fused with the thermoplastic resin contained in the pigment colored particles by irradiation to form a high-definition pattern. Since it is extremely easy to form, convergent light is preferable, and laser light (heat mode) that can directly draw a fine pattern without contact is most preferable.
[0021]
The particle diameter of the pigment-colored particles used for forming the black matrix or RGB pixel pattern is not particularly limited, and is usually 1 μm or less, preferably in the range of 0.001 to 1 μm, depending on the forming method and forming order. Selected from.
[0022]
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 diameter of 1 μm or less, particularly 0.05- 1 μm is preferred. Pigment-colored particles used to form RGB pixel patterns have a particle diameter of 1 μm or less in terms of light transmission.
Of these, 0.01 to 0.5 μm is preferable.
[0023]
The pigment colored particles in the portion irradiated with the laser beam in Step 2 are fused to form a colored image, and the uncolored portion of the pigment colored particles is removed by development or the like in Step 3 to be described later. When the pigment contained is a black pigment, an organic pigment of RGB color is used as the pigment contained in the pigment colored particles of each color on the filter matrix on which the black matrix is formed by the present invention or other methods. A color filter can be obtained by repeating coating, recording and developing for each color.
[0024]
Specifically, the laser light source used in the present invention is 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) argon laser (488 nm).
[0025]
The laser irradiation may be controlled so that the pigment colored particles are heated to a temperature at which the pigment colored particles are fused to each other, and the pigment colored particle layer is not etched.
[0026]
Further, the laser light irradiation can be performed from the convenient side, either from the transparent filter substrate side through the substrate or directly from the coating side. Of course, it may be performed from both sides, and laser light can be irradiated from both sides simultaneously.
[0027]
In step 3, development removal of the unfixed portion not irradiated with the laser other than the fixed portion to the substrate by fusing the pigment colored particles performed in step 2 is performed. In addition to the removal of unfixed particles by air, the development removal operation includes wet development, and both can be combined. In the case where the pigment is a pigment-colored particle coated with a self-water dispersible resin in which at least a part of a thermoplastic resin having an acid value is neutralized with a volatile base, the pigment was irradiated with a laser by the operation of step 2. The part becomes hot and the base is volatilized, and the fusion becomes a lipophilic film at the same time as the fusion, while the unirradiated part is hydrophilic and contains water or a water-soluble solvent containing a weak base, water-soluble organic solvent or surfactant. Selective development is possible using a developer.
[0028]
Next, the pigment colored particle dispersion will be described.
The dispersion of black pigment coated with a thermoplastic resin can be used for forming a black matrix pattern. Each dispersion of RGB organic pigments coated with a thermoplastic resin can be used for forming RGB pixel patterns.
[0029]
In the present invention, regardless of whether it is for black matrix pattern formation or RGB pixel pattern formation, a high-definition pattern can be easily formed as a dispersion of pigment particles coated with a thermoplastic resin according to the production method of the present invention. In terms of formation, 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 neutralization with a volatile base and dispersed in a dispersion medium. , It can be suitably used as a coloring composition for a color filter. Here, the dispersion medium of the dispersion liquid is preferably water alone or water as a main component from the viewpoint of less concern about the working environment and fire.
[0030]
A self-water dispersible resin in which at least a part of a thermoplastic resin having an acid value is neutralized with a volatile base is an acid group that is the source of the acid value of the thermoplastic resin at the same time as the dispersion medium is removed. Since the volatile base that neutralized the water also volatilizes and hardly remains, a film based on it is preferable because it tends to be relatively excellent in water resistance.
[0031]
In the present invention, a copolymer of (meth) acrylic acid and at least one monomer selected from the group consisting of styrene, substituted styrene, and (meth) acrylic acid ester is used as a dispersion of pigment-colored particles. , It is possible to provide a pigment colored particle dispersion having excellent stability.
[0032]
When the pigment colored particle dispersion is an aqueous dispersion, the self-water-dispersible resin has a salt of a thermoplastic resin having an acid value and a basic substance, or a hydrophilic group such as a hydroxyl group as a substituent. Although there are some, the resin has a thermoplastic acid value of 10 to 280 in order to make the water-dispersible pigment-colored particles fine, to prevent dissolution / swelling of the particles, and to impart great hydrophilicity to the particles. A self-water dispersible resin obtained by neutralizing at least a part of the resin with a base is preferable.
[0033]
In particular, in order to prevent the resin particles from fusing together and to be easily peeled off by development, the glass transition temperature of the resin is preferably 50 ° C. or higher, more preferably 70 to 150 ° C. A glass transition temperature in a range not hindering thermal fusion is good.
[0034]
In order to improve the resolvability of the colored part, the particle size of the resin particles is further reduced, and in order to increase the hydrophilicity of the unfused resin particles in the non-colored part and improve the developability, the acid group of the thermoplastic resin is increased. It is preferable that 40 mol% or more, preferably 40 to 120 mol%, is neutralized with a base.
[0035]
The anionic functional group that gives the acid value to the thermoplastic resin is not particularly limited, such as a carboxyl group, a sulfonic acid group, and a sulfinic acid group, but the carboxyl group is general and has good self-water dispersibility and laser. Enables lipophilicity of the fused film after irradiation.
[0036]
There are no particular restrictions on the type of resin of the self-water dispersible resin particles, but styrene or α-methylstyrene is preferred as satisfying the resin particle formation, film strength of the colored part, hydrophilicity of the non-colored part, etc. Substituted styrene, acrylic acid methyl ester, acrylic acid ethyl ester, acrylic acid butyl ester, acrylic acid 2-ethylhexyl ester and other acrylic acid esters, methacrylic acid methyl ester, methacrylic acid ethyl ester, methacrylic acid butyl ester, methacrylate 2-ethylhexyl methacrylate A copolymer containing at least one monomer unit selected from methacrylic acid esters and the like and at least one monomer unit selected from acrylic acid and methacrylic acid is preferable, and there is no particular limitation on the molecular weight range of the resin. Is 1,000 or more and 100,000 or less Those of the molecular weight is more preferable.
[0037]
The base used for neutralizing the thermoplastic resin having an acid value to make it self-dispersible is preferably volatile, and the volatile base is particularly preferably ammonia or an organic amine.
[0038]
Here, at least a part of the self-water-dispersible resin obtained by neutralizing at least a part of the acid value thermoplastic resin with a volatile base, which is a thermoplastic resin having an acid value, is intermolecularly crosslinked by a crosslinking agent. By doing so, a more durable colored part can be obtained.
[0039]
There are, for example, the following two methods for forming such a state of intermolecular crosslinking.
(1) A thermoplastic resin having an acid value is used in combination with a compound capable of permanently crosslinking the resin by a covalent bond.
[0040]
(2) Use is made of a thermoplastic resin in which crosslinking is dissociated by heating, in which a thermoplastic resin having an acid value is reacted with a polyvalent metal compound capable of reversibly crosslinking the resin by ionic bonds.
[0041]
Examples of the cross-linking agent include compounds that can permanently cross-link the resin by a covalent bond as those corresponding to the above (1). For example, known crosslinking agents such as polyepoxy compounds, oxazoline compounds (compounds containing an oxazoline group in the chemical structure), polyisocyanate compounds, and the like can be used. However, since these covalent crosslinking agents reduce the thermoplasticity of the resin, it is preferable that the crosslinking is limited to 0.1 to 30 mol%, particularly 1 to 10 mol%.
[0042]
By containing a thermoplastic resin having an acid value and the crosslinkable compound in the dispersion, without lowering the melting temperature of the thermoplastic resin by the heat of the laser, and by crosslinking with the crosslinking component after melting, Thermal and mechanical strength is improved, and a colored portion having further excellent durability can be obtained.
[0043]
On the other hand, similarly to (2), a so-called ionomer resin in which at least a part of the total amount of functional groups giving acid value in a thermoplastic resin is intermolecularly crosslinked via a polyvalent metal ion is In order not to lower the thermoplasticity of the plastic resin, the pigment-colored particles are easily fused by the heat of the laser to give excellent durability and adhesion to the substrate.
[0044]
Ionomer resins differ from covalent crosslinks that form permanent gels with a permanently cross-linked network structure, and ionizable polyvalent metal ions and anionic groups that form reversible gels with a reversible cross-linked network structure. It is a chelating resin by bonding. This resin behaves as if it was permanently cross-linked at around room temperature, but when heated, the ionic bond dissociates and behaves as a thermoplastic resin before cross-linking. The resin particles and the heat-sealing resin film obtained from the aqueous dispersion are extremely tough and rich in elasticity, and have excellent adhesion to the substrate. The reversible cross-linking means that since the ionic bond energy is smaller than the covalent bond energy, good thermoplasticity is exhibited even if the cross-linking rate is high.
[0045]
The polyvalent metal ion used in the ionomer resin may have any valence of 2 or more, preferably 2 or 3, and particularly preferably aluminum ions, titanium ions, Those having a valence of 3 or more such as zirconium ions, resin particles are colorless, less toxic, tough and exhibit good thermoplasticity are preferred.
[0046]
The cross-linking of the resin with these polyvalent metal ions is preferably stable with less gelation of the thermoplastic resin when cross-linked with polyvalent metal ions in an amount corresponding to 1% to 30% of the anionic functional group. An ionomer resin aqueous dispersion can be obtained, and the heat flow characteristics of the resin particles are hardly degraded.
[0047]
Of course, the above methods (1) and (2) can be used in combination.
[0048]
The pigment of the present invention preferably has good spectral characteristics, light resistance, particle diameter, and dispersibility. Specifically, black pigments include carbon black, graphite, titanium black, platinum black, and perylene pigments. However, carbon black is preferable in terms of cost.
[0049]
Examples of color pigments include organic pigments of each color of RGB. Red color includes perylene pigments, lake pigments, azo pigments, quinacridone pigments, anthraquinone pigments, and the like. I. Pigment Red 9, 97, 102, 122, 123, 149, 168, 177, 179, 180, 192, 215, 224, etc., green is a halogen polysubstituted (copper) phthalocyanine pigment, specifically C.I. I. Pigment Green 7, 36, and blue include copper phthalocyanine pigments, indanthrone pigments, cyanine pigments, and the like. I. Pigment Blue 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 22, 60, 64, and the like. Other examples include yellow pigments for toning such as isoindoline, disazo, isoindolinone, and acetolone pigments. I. Pigment Yellow 83, 109, 110, 139, 154 and the like, dioxazine pigments as violet pigments, specifically C.I. I. Pigment violet 23, 37, and the like.
[0050]
As the dispersion liquid in the present invention, a dispersion is used 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 dispersed in a dispersion medium. The self-water-dispersible pigment-colored particles in this case can use a known resin emulsification method, and specifically include the following two methods.
[0051]
First, in the so-called phase inversion emulsification method, specifically, as a first step, a resin and a pigment that can be made self-dispersible at least by neutralization are kneaded in an organic solvent, and a predetermined amount of a neutralizing base is further mixed. To do. As the second stage, emulsification is carried out by mixing an excessive amount of an aqueous medium with the colored resin solution obtained in the first stage to obtain an aqueous dispersion of pigment colored particles.
[0052]
If necessary, a desolvation step for removing the organic solvent used in the first step may be added as a third step in order to enhance the dispersion stability of the pigment colored particle dispersion. In addition, after the second or third stage is completed, large pigment particle colored particles and large particle resin particles are removed by filtering or centrifuging to make the particle size distribution constant or narrow. It is preferable to perform the process to do.
[0053]
Examples of organic solvents that dissolve the thermoplastic resin in the first stage include ketone solvents such as acetone, dimethyl ketone, and methyl ethyl ketone, alcohol solvents such as methanol, ethanol, and isopropyl alcohol, and chlorine solvents such as chloroform and methylene chloride. , 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, amides and other resins can be used. However, 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.
[0054]
The amount of the organic solvent used is not particularly defined as long as the effects of the present invention are achieved, but is preferably such that the weight ratio of thermoplastic resin / organic solvent is 1/1 to 1/20.
[0055]
Next, in a method called suspension reprecipitation method, specifically, colored resin particle aqueous dispersion is obtained in the following steps.
[0056]
(1) A resin coloring step of obtaining a solid coloring compound by dispersing at least a pigment in a thermoplastic resin having an acid value.
(2) Mixing at least water, an organic solvent that dissolves the thermoplastic resin, a base, and the solid coloring compound obtained in the resin coloring step, and a pigment suspension in which at least a part of the resin is dissolved by dispersion Obtaining suspension step.
(3) A reprecipitation step of depositing a dissolved resin component on the pigment surface in the pigment suspension obtained in the suspension step.
[0057]
The resin coloring step (1) is a step of obtaining a solid coloring compound by dispersing at least a pigment in a thermoplastic resin having an acid value. In this step, for example, the pigment is uniformly dispersed in a thermoplastic resin having an acid value in a solution or in a heated and melted state using a kneading apparatus such as a conventionally known roll, kneader or bead mill. The solid kneaded product (solid coloring compound) can be taken out.
[0058]
As a means for dispersing the pigment, it is preferable to use a dispersion means that forms a relatively high shearing force among the dispersion methods known in the art and perform dispersion under a high shearing force. As such a suitable means, it is preferable to use two rolls.
[0059]
In the suspension step (2) of this 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 a part of the resin is dispersed by dispersion. This is a step of obtaining a dissolved pigment suspension.
[0060]
The solid coloring compound obtained in the resin coloring step of (1) is added to water, an organic solvent that dissolves the thermoplastic resin having an acid value, and a mixed solvent that requires a base as a dispersion medium, and uniformly dispersed. The film-forming resin having an acid value including the pigment is dissolved or self-emulsified with the help of an organic solvent and a base from the surface of the solid coloring compound. A pigment suspension in which parts are dissolved is obtained.
[0061]
By this step, the thermoplastic resin having an acid value present on the surface of the solid coloring compound is gradually neutralized at least partly or entirely with the base by the base, and the mixture is converted into a mixture from the solid form of the compound. Becomes suspended.
[0062]
When the resin is completely dissolved in the liquid medium, the pigment surface in the suspension is exposed, but when the resin is self-emulsified, at least one pigment surface is present. The part is considered to be coated with resin.
[0063]
As a stirring method for obtaining a suspension, any known and commonly used method can be employed. For example, in addition to a conventional uniaxial propeller-type stirring blade, a stirring blade or a stirring vessel having a shape suitable for the purpose is used. And can be easily suspended.
[0064]
In obtaining a suspension, there is no shear force or relatively little, only simple mixing and stirring, or if the pigment is more likely to agglomerate, in addition to that, then further dispersion under high shear force. May be stabilized. As a disperser in this case, it is preferable to use a beadless disperser known as a high-pressure homogenizer, a trade name microfluidizer, or a nanomizer because the reaggregation of the pigment is small.
[0065]
The reprecipitation step (3) of this method is a step of depositing the dissolved resin component on the pigment surface in the pigment suspension obtained in the suspension step. In this method, “reprecipitation” does not mean that the pigment or the pigment having the dissolved resin adsorbed on the pigment surface is separated and settled from the liquid medium of the suspension.
[0066]
The deposition of the dissolved resin on the pigment surface in the pigment suspension in the suspension step (2) is, for example, (1) the pigment suspension in which at least a part of the resin is dissolved is applied to the resin It can be easily carried out by adding water or an aqueous medium that functions as a poor solvent and / or removing the organic solvent from the pigment suspension.
[0067]
Thus, in (3), colored resin particles having a desired particle diameter can be obtained, but the average particle diameter range is usually 0.01 to 20 μm.
[0068]
Crosslinking of the resin with the crosslinking agent can be achieved by adding the crosslinking agent to any of the above steps to form colored resin particles and then heating the dispersion.
[0069]
In the ion-crosslinking of the resin of the pigment colored particles, the polyvalent metal ion is added as a metal or a soluble polyvalent metal salt to the resin solution in the above phase inversion emulsification method or to the kneading step or suspension step of the suspension reprecipitation method.
[0070]
Those selected from ligands such as polyvalent metal carboxylates, acetylacetone and acetoacetic ester salts and metal chelates of polyvalent metals are preferred in view 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 cross-linking, resulting in gelation and a larger particle size of the resin emulsion. At this time, the liquid temperature is increased, or acetylacetone or acetoacetate is used. By adding an excessive amount of the volatile chelating agent as described above, gelation can be prevented and a resin emulsion having a fine particle diameter can be obtained.
[0071]
The pigment colored particle dispersion thus obtained can be used as it is, but the colored resin particles are in a swollen state due to the influence of the coexisting organic solvent, so that the storage stability can be further improved, or In order to further improve safety against fire and pollution, it is possible to carry out further organic removal solvent.
[0072]
As necessary, the thermoplastic resin solution may be added with a dispersant, a plasticizer, an antioxidant, an ultraviolet absorber, an energy absorber for efficiently absorbing the thermal energy of the irradiated laser, and the like. You can also keep it.
[0073]
In addition, when heat-bonding pigment colored particles with a laser and adding a compound that crosslinks with the resin, a filter with extremely high heat resistance can be obtained. That is, the aqueous dispersion of pigmented resin particles included in the thermoplastic resin having an acid group of the present invention contains a compound that crosslinks with the thermoplastic resin as a crosslinking agent.
[0074]
As described in detail above, known crosslinking agents can be used, but those that dissolve in the dispersion medium react with the resin in a relatively short time to generate coarse particles, and are preferably preferably dispersed. The addition of a water-soluble polymer, specifically, a polymer having a water-dispersible oxazoline group is preferred.
[0075]
The aqueous medium mixed with the thermoplastic resin solution is preferably water of a grade higher than ion-exchanged water in order to avoid the influence of impurities and metal ions.
[0076]
In addition, a particle adhesion preventing agent may be used in combination with the particle layer of pigment-colored particles having self-water dispersibility, and the particle adhesion preventing agent is not particularly limited. For example, ethylene glycol, diethylene glycol, polyethylene glycol , Polyhydric alcohols such as glycerin, inorganic fine particles such as colloidal silica, and surfactants.
[0077]
The self-water-dispersible pigment-colored particle dispersion may contain, as additives, the particle adhesion preventive agent, preservative, particle crosslinker that can be activated by laser light, and the like.
[0078]
The development (removal) of unfused pigment colored particles used in the method for producing a color filter of the present invention is mainly water or water, and additives such as an alkali agent, a water-soluble organic solvent, and a surfactant as necessary. Can be carried out using a developer containing
[0079]
The color filter manufacturing method of the present invention relates to the color filter coloring method part, and does not prevent the conventional color filter manufacturing process from entering before and after the process of the manufacturing method. The black matrix and RGB pixels obtained by the present invention correspond to a part of the entire color filter.
[0080]
Specifically, for example, the following operations 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 with laser heat to record a pattern corresponding to a black matrix, and an unrecorded The process of removing the pigment colored particles in the portion, and a dispersion of RGB organic pigment particles coated with the thermoplastic resin are applied to the filter substrate, and the thermoplastic resin is fused by the heat of the laser to each RGB pixel. A color filter component can be manufactured by carrying out these steps in this order, including a step of performing corresponding pattern recording and a step of removing each pigment colored particle of RGB in an unrecorded portion.
[0081]
The color filter component thus obtained can be made into a color filter finished product, for example, by covering the black matrix and RGB pixels with a protective film and providing a transparent conductive film on the protective film. I can do it.
[0082]
The color filter coloring composition of the present invention can also be applied as a color material for known color filter manufacturing methods such as electrodeposition, resin coloring, and printing.
[0083]
DETAILED DESCRIPTION OF THE INVENTION
The case where the preferred embodiment of the present invention is produced by the phase inversion emulsification method is described as follows.
[0084]
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, an ionomer resin having a structure in which a part of the thermoplastic resin is integrated by intermolecular crosslinking via polyvalent metal ions. After dissolving in an organic solvent, 40 mol% or more lower amines of the acid groups of the thermoplastic resin are further mixed.
[0085]
After adding a pigment to this resin solution and dispersing the pigment with a disperser, emulsification is carried out by mixing an excess amount of an aqueous medium containing ethylene glycol as a particle adhesion preventing agent, and a crosslinking agent is added if necessary. After further concentration, the pigment concentration and additives are adjusted, and then each large particle size particle is removed by filter filtration or centrifugation to obtain a dispersion of self-water dispersible pigment colored particles.
[0086]
The obtained self-water-dispersible pigment-colored particle dispersion is applied onto the surface of the transparent color filter substrate, and after removing excess water and low-boiling organic solvent to form a uniform coating, the pigment-colored particles are fused together. Then, the temperature is raised with a laser beam to a temperature at which it becomes a lipophilic resin, and fixing to the substrate is performed. Next, an unirradiated portion of the laser beam is developed using a developer such as water, and unfused pigment colored particles are removed. A color filter can be obtained by performing the above operation for each color.
[0087]
【Example】
Next, the present invention will be described more specifically with reference to examples and comparative examples. In the following examples, “part” represents “part by weight”.
[0088]
Example 1
Styrene acrylic acid resin (styrene / acrylic acid / ethyl 2-ethylhexyl acrylate ester = 77/13/10; acid value 100; molecular weight 40,000) 10 parts, carbon black 10 parts, acetylacetonatoaluminum 6 parts (crosslinking rate 9%) Equivalent amount), 50 parts of methyl ethyl ketone and 150 parts of 0.2 mm diameter glass beads were dispersed for 4 hours using a paint shaker.
[0089]
40 parts of methyl ethyl ketone, 40 parts of isopropyl alcohol, and 4 parts of triethylamine (amount corresponding to the neutralization rate of the resin of 60%) are added to 76 parts of the dispersion excluding the glass beads, and a mixed solution of 420 parts of ion-exchanged water is stirred. After dropwise addition at a rate of 5 ml per minute to obtain an aqueous dispersion containing pigmented particles having a particle diameter of 0.1 μm, a water-dispersible oxazoline polymer (Epocross K-1030E manufactured by Nippon Shokubai Co., Ltd., nonvolatile content 40) (5% by mass) Add 5 parts, heat at 60 ° C. for 5 hours, then concentrate to a pigment concentration of 20%, add 5% propylene glycol propyl ether and stir, then use a 0.5 μm membrane filter. Filtration was performed to obtain a final black pigment colored particle dispersion liquid having a particle diameter of 0.1 μm and including a permanently crosslinked portion.
[0090]
The resulting black pigment colored particle dispersion is coated on a transparent substrate for a color filter, air-dried at 40 ° C., and then irradiated with a laser using an irradiation device equipped with a semiconductor laser element to form a black matrix pattern by heat fixing. The unirradiated portion was washed away with a pure water spray, and finally heated at 150 ° C. for 1 hour in a vacuum to obtain a substrate on which a black matrix filter was formed.
[0091]
(Example 2)
Pigment C.I. I. Pigment Blue 15: 6 40 parts and a styrene acrylic acid resin (styrene / acrylic acid / acrylic acid 2-ethylhexyl ester = 77/13/10; acid value 100; molecular weight 40,000) 40 parts of a two-roll kneaded mixture with water 250 parts, 16 parts of triethylamine (amount corresponding to the resin neutralization rate of 60%), 90 parts of methyl ethyl ketone, 40 parts of isopropyl alcohol, stirred for 3 hours at room temperature, and the kneaded material was dissolved. Dispersion was performed at a pressure of 98 MPa using a machine nanomizer (manufactured by Nanomizer) to obtain a blue pigment suspension.
[0092]
While stirring the resulting pigment suspension, a mixture of 2 parts of ethylene glycol and 150 parts of water was added dropwise at a rate of 5 ml per minute, and a water dispersible oxazoline polymer (Epocross K- 1030E (non-volatile content: 40% by mass), add 10 parts, heat at 60 ° C. for 5 hours, then concentrate to a pigment concentration of 15%, add 5% propylene glycol propyl ether and stir, then 0.5 μm A final blue pigment colored particle dispersion with a particle size of 0.1 μm was obtained.
[0093]
Similarly, the pigment C.I. I. Pigment Red 177 was used to prepare a red pigmented particle dispersion in the same manner as C.I. I. Pigment Green 36 was used to obtain a green pigment colored particle dispersion. In any of the dispersions, the pigment colored particles had a particle diameter of 0.1 μm.
[0094]
The blue pigment colored particle dispersion is coated on the black matrix filter substrate prepared in Example 1, and the pressure is reduced to 4000 Pa to form a coating film. Then, using the irradiation device equipped with the semiconductor laser element, the blue matrix surrounded by the black matrix is coated. After heat-fixing by laser irradiation in place, wash away the unirradiated part with pure water spray, blow off excess water with an air gun to obtain a blue colored part, and then the same for green and red Colored parts are formed using dispersions of each color, and finally heated at 150 ° C. for 1 hour in a vacuum to provide a high-resolution color filter with no pigment aggregation and high transparency and excellent light resistance I got the parts.
[0095]
【The invention's effect】
In 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 with the heat of a laser, and a pigment in an unrecorded portion Since the process of removing the colored particles is included, a particularly remarkable effect is obtained that a color filter having high resolution, excellent transparency, and excellent light resistance can be obtained.
[0096]
In the present invention, the pigment is a dispersion in which the pigment is a dispersion in which at least a part of the thermoplastic resin having an acid value is coated with a self-water dispersible resin obtained by neutralization with a volatile base and dispersed in a dispersion medium. Since the product is used for a color filter, it is possible to obtain a color filter having high resolution, no pigment aggregation, high transparency, and excellent durability (light resistance).

Claims (12)

At least a step of applying a dispersion of pigment particles coated with a thermoplastic resin to a transparent filter substrate and fusing the thermoplastic resin with laser heat to record a pattern corresponding to a black matrix or RGB pixels A color filter manufacturing method comprising: a step and a step of removing pigment-colored particles in an unrecorded portion. The color filter manufacturing method according to claim 1, wherein a pattern corresponding to the black matrix is formed using a black pigment as the pigment. Using RGB organic pigments in the pigment, the coating for each color on the filter substrate on which the black matrix is formed, recording, and forming a pattern corresponding to the RGB pixels by performing the removal process The color filter manufacturing method according to claim 1 or 2. For a color filter, wherein 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. The coloring composition for a color filter according to claim 4, wherein at least part of the amount of the functional group giving an acid value of the thermoplastic resin having an acid value is intermolecularly crosslinked through a polyvalent metal ion. The coloring composition for a color filter according to claim 4 or 5, wherein the thermoplastic resin having an acid value and a compound capable of crosslinking are contained in the dispersion. The colored composition for a color filter according to claim 6, wherein the compound capable of crosslinking with the thermoplastic resin having an acid value has an oxazoline group in the chemical structure. The coloring composition for a color filter according to any one of claims 4 to 7, wherein the volatile base that neutralizes the thermoplastic resin having an acid value is ammonia or an organic amine. Use of a dispersion in which a pigment is coated with a self-water dispersible resin in which at least a part of a thermoplastic resin having an acid value is neutralized with a volatile base and dispersed in a dispersion medium, for producing a color filter. The dispersion filter according to claim 9, wherein at least a part of the acid group-providing functional group amount of the thermoplastic resin having an acid value is intermolecularly crosslinked via a polyvalent metal ion. use. The use of the dispersion for producing a color filter according to claim 9 or 10, wherein the dispersion contains a thermoplastic resin having an acid value and a compound having an oxazoline group in the chemical structure. 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 with laser heat to record a pattern corresponding to a black matrix, and an unrecorded Part of pigment colored particles is removed, and a dispersion of RGB pigment particles coated with thermoplastic resin is applied to the filter substrate, and the thermoplastic resin is fused by the heat of the laser to accommodate each RGB pixel. A pattern recording step, a step of removing uncolored RGB pigment-colored particles, a step of covering the black matrix and RGB pixels with a protective film, and a step of providing a transparent conductive film on the protective film A method for producing a color filter, comprising: