KR20110125369A - Ink composition for ink-jet, color filter using the composition and display unit comprising the color filter - Google Patents

Abstract

PURPOSE: An ink composition for ink-jet, a color filter using the composition and a display unit comprising the color filter are provided to improve the efficiency of an ink jet process for manufacturing a color filter by manufacturing an ink composition for ink-jet having a high solid portion. CONSTITUTION: An ink composition for an ink-jet comprises (a) a binder polymer having an epoxy group, (b) a melamine compound represented by chemical formula 1, (c) a polymerizable monomer having three or more ethylenic functional group, (d) a polymerization initiator, (e) a coloring agent and (f) a solvent. The ink composition for an ink-jet has a three-dimensional network.

Description

Ink composition for inkjet, color filter using same, and display device including same {INK COMPOSITION FOR INK-JET, COLOR FILTER USING THE COMPOSITION AND DISPLAY UNIT COMPRISING THE COLOR FILTER}

This invention relates to the ink composition for inkjets which is excellent in chemical resistance and high in solid content.

In the manufacture of color filters and various wirings such as liquid crystal displays, organic EL displays, and plasma displays, nulls are used in inkjet processes. The inkjet process is a method of forming a desired thin film by printing a liquid raw material according to a predesigned pattern using inkjet equipment and then drying. Therefore, it is known to be a very innovative process in terms of economics or eco-friendliness because it uses a small amount of material compared to the existing process.

In particular, the chemical resistance of the ink in the liquid crystal display manufacturing process is one of the important factors among the color filter evaluation items. This is because a fatal defect may be caused when the colorant in the color filter is eluted by the solvent used in the post-treatment process. Therefore, in order to improve the chemical resistance of the color filter, the degree of curing should be strengthened to produce an ink film having a robust network structure.

Accordingly, an object of the present invention is to provide an ink composition which is excellent in chemical resistance and can provide an ink composition having a high solid content, and which can greatly improve the efficiency of an inkjet process for producing a color filter.

In order to achieve the above object, the present invention is (a) a binder polymer containing an epoxy group, (b) a melamine compound represented by the following formula (1), (c) a polymerizable monomer having three or more ethylenic functional groups, (d) It provides a ink composition for an inkjet comprising a polymerization initiator, (e) a colorant and (f) a solvent, and implementing two or more three-dimensional network networks in a curing state.

[Formula 1]

Where

At least two of R1, R2 and R3 are amine groups, and the substituents other than the amine groups in R1 to R3 are hydrogen,

The amine groups are each independently a linear or branched alkyl having 1 to 30 carbon atoms; Linear or branched alkoxy having 1 to 30 carbon atoms; Linear or branched allyl having 3 to 30 carbon atoms; Linear or branched alkenyl having 2 to 30 carbon atoms; Linear or branched vinyl of 2 to 30 carbon atoms; Carboxyl group (COO-); Ether group (-CH ₂ OR), alcohol group (-CH ₂ OH), substituted or unsubstituted cycloalkyl having 3 to 20 carbon atoms; Substituted or unsubstituted aryl having 6 to 40 carbon atoms; Substituted or unsubstituted aralkyl having 7 to 15 carbon atoms; It may be substituted with a substituent selected from the group consisting of alkylaryl having 7 to 15 carbon atoms unsubstituted or substituted with a hydrocarbon,

When the substituent substituted by the said amine group is substituted by other substituents, these substituents are a C1-C30 alkyl group; Aryl groups having 6 to 40 carbon atoms; It is selected from the group consisting of a heterocyclic group and a halogen group having 3 to 40 carbon atoms.

The present invention also provides a color filter manufactured using the ink composition for the inkjet.

In addition, the present invention provides a display device including the color filter.

The ink composition for inkjet according to the present invention can provide an ink composition having excellent chemical resistance and high solid content, and can greatly improve the efficiency of an inkjet process for manufacturing a color filter.

1 is a schematic diagram of a curing mechanism of an ink composition for an inkjet according to the present invention, in which a dual three-dimensional network network is formed.

The ink composition for inkjet of the present invention is characterized by forming two or more kinds of three-dimensional network networks in a cured state.

The curing state of the inkjet ink composition means a state in which the inkjet ink composition of the present invention is manufactured in the form of an ink film through a heating process or the like.

In addition, the two or more kinds of three-dimensional network network is the ink composition of the inkjet ink composition according to the present invention to react the melamine compound acting as a crosslinking agent with the epoxy group of the binder polymer to form a first three-dimensional network network solid in the ink film In addition, this means a state in which a polymerizable monomer having three or more functional groups forms another three-dimensional network having different properties between polymers forming the three-dimensional network.

Figure 1 shows a schematic diagram of the curing mechanism of the ink composition for the inkjet is formed a different dual three-dimensional network network.

As described above, the ink composition for ink jet according to the present invention has a dual three-dimensional network structure having different characteristics, and thus an ink film having excellent chemical resistance can be formed.

Hereinafter, the present invention will be described in more detail.

The present invention provides a binder polymer containing (a) an epoxy group, (b) a melamine compound represented by the formula (1), (c) a polymerizable monomer having three or more ethylenic functional groups, (d) a polymerization initiator, and (e) a colorant. And (f) a solvent, and providing an ink composition for an ink jet, wherein the two or more network networks are implemented in a curing state.

The binder polymer containing the epoxy group (a) is not particularly limited as long as it is a polymer that does not deteriorate the performance of an inkjet ink composition. Preferably, the monomer having an epoxy group and the acrylic monomer having an epoxy group have an ethylenic double bond in the side chain. Copolymers of at least one substance selected from the group consisting of acrylic monomers and (meth) acrylic acid ester monomers, styrene monomers, and silane monomers containing ethylenically unsaturated defects can be used.

In this case, the copolymer is preferably contained in the content of the monomer having the epoxy group in 5 to 30 mol% based on the entire copolymer.

When the content of the monomer having an epoxy is less than 5 mol%, the degree of curing of the ink may be weak, and thus the strength and chemical resistance of the ink film may be weakened. If the content of the monomer is greater than 30 wt%, the reactivity of the binder may be too high to react with the colorant component. As a result, the storage stability of the ink may deteriorate. Therefore, in order to improve the chemical resistance, it is not possible to continuously increase the content of epoxy in the binder, so a method of improving chemical resistance by a double network structure has been introduced.

It is preferable that the weight average molecular weights of the binder polymer containing the said (a) epoxy group are 1,000-100,000. If the weight average molecular weight is 100,000 or more, there is a fear that the solubility in the solvent or the viscosity of the entire ink may be too high. If the weight average molecular weight is less than 1,000, the physical property of the ink film may finally occur.

The a) binder polymer containing an epoxy group is preferably 1 to 20% by weight based on the total weight of the ink composition for inkjet. When the content of the binder polymer containing the epoxy group is less than 1% by weight, the mechanical properties of the ink film may be weakened, and thus the chemical resistance may be weakened. When the content of the binder polymer is greater than 20% by weight, the viscosity of the ink may be too high to make the inkjet process unstable. Can be.

(B) The melamine compound represented by the formula (1) has a strong three-dimensional network structure by acting as a cross-linker between two or three amine groups formed from the terminal functional group and the binder polymer containing the (a) epoxy group By forming a network, the chemical resistance of the ink film can be improved.

In addition, the ink composition for inkjet (b) containing the melamine compound represented by Formula 1 is subjected to a condensation type thermosetting process rather than a chain polymerization using a carbon-carbon double bond, thereby improving the overall chemical resistance of the ink film. Can be.

In addition, (b) the melamine compound represented by the formula (1) has a lower molecular weight and lower viscosity compared to the dipentaerythritol hexaacrylate (DPHA), which is a monomer used in the inkjet ink composition, so that the dosage is increased. Since the solid content of the ink composition for an inkjet can be increased, the number of drops of ink can be reduced in a coating process such as an inkjet process.

In one preferred embodiment, the compound of Formula 1 may be represented by the following formula (2).

[Formula 2]

Where

R4, to R9 are each independently, linear or branched alkyl having 1 to 30 carbon atoms; Linear or branched alkoxy having 1 to 30 carbon atoms; Linear or branched allyl having 3 to 30 carbon atoms; Linear or branched alkenyl having 2 to 30 carbon atoms; Linear or branched vinyl of 2 to 30 carbon atoms; Carboxyl group (COO-); Ether group (-CH ₂ OR), alcohol group (-CH ₂ OH), substituted or unsubstituted cycloalkyl having 3 to 20 carbon atoms; Substituted or unsubstituted aryl having 6 to 40 carbon atoms; Substituted or unsubstituted aralkyl having 7 to 15 carbon atoms; It is selected from the group consisting of alkylaryl having 7 to 15 carbon atoms unsubstituted or substituted with hydrocarbon,

When R4 to R9 are substituted by other substituents, these substituents include an alkyl group having 1 to 30 carbon atoms; Aryl groups having 6 to 40 carbon atoms; It is selected from the group consisting of a heterocyclic group and a halogen group having 3 to 40 carbon atoms.

In the present invention, the alkyl group having 1 to 30 carbon atoms may be at least one selected from the group consisting of methyl group, ethyl group, propyl group, isopropyl group, butyl group, tertiary-butyl group, pentyl group, hexyl group and heptyl group. .

The aryl group having 6 to 40 carbon atoms may be at least one selected from the group consisting of a phenyl group, a naphthyl group, anthracenyl group, a biphenyl group, a pyrenyl group, and a perrylenyl group.

The heterocyclic group having 3 to 40 carbon atoms may be at least one selected from the group consisting of pyridyl group, bipyridyl group, acridinyl group, thienyl group, imidazolyl group, oxazolyl group, thiazolyl group and quinolyl group.

The halogen group may be at least one selected from the group consisting of fluorine, chlorine, bromine and iodine.

B) The melamine compound represented by Formula 1 is preferably 1 to 20% by weight based on the total weight of the ink composition for inkjet. If the content of the melamine compound represented by the formula (1) is less than 1% by weight, the degree of curing of the ink film may be weak, and the chemical resistance may deteriorate. When the amount of the melamine compound is greater than 20% by weight, the amount of the melamine compound does not react because the amount of the melamine compound is too high. Will be present and fume may be generated during the curing process.

The polymerizable monomer having three or more ethylenic functional groups may include trimethylol ethane triacrylate, trimethylol propane triacrylate, pentaerythritol tetra acrylate, pentaerythritol triacrylate, dipentaerythritol penta acryl. Using at least one selected from the group consisting of latex, dipentaerythritol hexa acrylate, polyfunctional monomers having caprolactone, epoxy acrylates of bisphenol A derivatives, novolak-epoxy acrylates, and ures multifunctional monomers It is preferable.

C) The polymerizable monomer having three or more ethylenic functional groups is preferably 1 to 20% by weight based on the total weight of the ink composition for inkjet. When the content of the polymerizable monomer having three or more ethylenic functional groups is less than 1% by weight, the heat resistance and strength of the ink film may be lowered due to insufficient crosslinking, and when it exceeds 20% by weight, the curing process or the additional heat treatment process. In this case, the unreacted monomer may be denatured, thereby decreasing the permeability of the ink film.

In addition, since the viscosity of the polymerizable monomer having three or more ethylenic functional groups (c) is relatively lower than that of the binder polymer (a), the dosage can be increased, so that the solid content of the ink composition for an inkjet can be increased, thereby making the inkjet process possible. It is possible to reduce the number of drops of ink in the coating process.

The polymerizable monomer having three or more ethylenic functional groups (c) is a substance containing three or more reactive groups in a molecule, and polymerizes with a radical active species formed from the following polymerization initiator to form a three-dimensional network structure. The chemical resistance of the ink film can be improved.

The d) polymerization initiator may be used one or more selected from a thermal polymerization initiator and a photopolymerization initiator.

Non-limiting examples of the thermal polymerization initiator include 2,2'-azobisisobutyronitrile (AIBN), 2,2'-azobis- (2,4-dimethylvaleronitrile), 2,2'- Azobis- (4-methoxy-2,4-dimethylvaleronitrile), 2-cyano-2-propylazoformamide, 1,1'-azobis (cyclohexane-1-caronitrile), 2, 2'-azobis (2-methylbutyronitrile), V-40, VA-086, VA-085, VF096, VAm-110, Vam-111 (above Wako pure chemicals ind.), Benzoyl peroxide, lauro Yl peroxide, t-butylperoxy pivalate and 1,1'-bis- (bis-t-, butylperoxy) cyclohexane and the like.

Non-limiting examples of the photopolymerization initiator include 2,4-trichloromethyl- (4'-methoxyphenyl) -6-triazine, 2,4-trichloromethyl- (4'-methoxystyryl) -6 -Triazine, 2,4-trichloromethyl- (piflonil) -6-triazine, 2,4-trichloromethyl- (3 ', 4'-dimethoxyphenyl) -6-triazine, 3- Triazine compounds such as {4- [2,4-bis (trichloromethyl) -s-triazin-6-yl] phenylthio} propanoic acid; 2,2'-bis (2-chlorophenyl) -4,4 ', 5,5'-tetraphenyl biimidazole, 2,2'-bis (2,3-dichlorophenyl) -4,4', 5 Biimidazole compounds such as 5′-tetraphenylbiimidazole; 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 4- (2-hydroxy Methoxy) -phenyl (2-hydroxy) propyl ketone, 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy-2-phenyl acetophenone, 2-methyl- (4-methylthiophenyl) -2-mol Acetophenone-based compounds (Irgacure- such as polyno-1-propane-1-one (Irgacure-907) and 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one) 369); O-acyl oxime compounds such as Irgacure OXE 01 and Irgacure OXE 02 from Ciba Geigy; Benzophenone compounds such as 4,4'-bis (dimethylamino) benzophenone and 4,4'-bis (diethylamino) benzophenone; Thioxanthone-based compounds such as 2,4-diethyl thioxanthone, 2-chloro thioxanthone, isopropyl thioxanthone and diisopropyl thioxanthone; 2,4,6-trimethylbenzoyl diphenylphosphine oxide, bis (2,6-dimethoxybenzoyl) -2,4,4-trimethylpentyl phosphine oxide, bis (2,6-dichlorobenzoyl) propyl phosphine oxide Phosphine oxide compounds such as these; 3,3'-carbonylvinyl-7- (diethylamino) coumarin, 3- (2-benzothiazolyl) -7- (diethylamino) coumarin, 3-benzoyl-7- (diethylamino) coumarin, 3-benzoyl-7-methoxy-coumarin, 10,10'-carbonylbis [1,1,7,7-tetramethyl-2,3,6,7-tetrahydro-1H, 5H, 11H-Cl] Coumarin-based compounds such as -benzopyrano [6,7,8-ij] -quinolizin-11-one; and the like.

The d) the polymerization initiator is preferably included in 0.1 to 5% by weight of the total weight of the ink composition for an inkjet. If the content of the polymerization initiator is less than 0.1% by weight, the film participation strength of the polymerizable monomer may be lowered, and the film strength, heat resistance, etc. of the prepared polymer film may be lowered. Contamination and viscosity of the ink composition for ink may be increased, thereby decreasing the jetting property.

The colorant e) is preferably high transmittance and smaller in particle size. The average particle diameter of the said particle | grains becomes like this. Preferably it is 0.01-0.2 micrometer, More preferably, it is 0.01-0.05 micrometer.

The colorant may use various conventionally known pigments, dyes or mixtures thereof. Specific examples of the colorant include carmine 6B (CI12490), phthalocyanine green (CI 74260), phthalocyanine blue (CI 74160), perylene black (BASF K0084. K0086), cyanine black, linol yellow (CI21090), linol yellow GRO (CI 21090), benzidine yellow 4T-564D, Victoria pure blue (CI42595), CI PIGMENT RED 3, 23, 97, 108, 122, 139, 140, 141, 142, 143, 144, 149, 166, 168, 175, 177, 180, 185, 189, 190, 192, 202, 214, 215, 220, 221, 224, 230, 235, 242, 254, 255, 260, 262, 264, 272; C.I. PIGMENT GREEN 7, 36; C.I. PIGMENT blue 15: 1, 15: 3, 15: 4, 15: 6, 16, 22, 28, 36, 60, 64; C.I. PIGMENT yellow 13, 14, 35, 53, 83, 93, 95, 110, 120, 138, 139, 150, 151, 154, 175, 180, 181, 185, 194, 213; C.I. PIGMENT VIOLET 15, 19, 23, 29, 32, 37, etc. In addition, a white pigment, a fluorescent pigment, etc. can also be used.

The colorant is preferably added 0.5 to 10% by weight relative to the total weight of the ink composition for inkjet. If the content of the colorant is less than 0.5 wt%, the desired chromaticity cannot be exhibited. If it is more than 10 wt%, there may be a problem in dispersion stability of the colorant in the ink composition.

The solvent f) is preferably a solvent having a boiling point of 150 ° C. or higher and a high boiling point solvent having low volatility, and more preferably having a boiling point of 150 to 250 ° C.

Specific examples of the f) solvent include ethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether, Diethylene glycol monoethyl ether acetate, dipropylene glycol methyl ether acetate, methoxy ethanol, ethoxy ethanol, butoxy ethanol, butoxy propanol, ethoxy ethyl acetate, and butoxy acetate and butoxy One or more selected from the group consisting of ethyl acetate may be used, but is not limited thereto.

The solvent (f) is preferably 40 to 90% by weight based on the total weight of the ink composition for inkjet. If the solvent is less than 40% by weight of the ink viscosity is too high may deteriorate the stability of the inkjet process, if it exceeds 90% by weight solids is too low can reduce the efficiency of the inkjet process.

The ink composition for an inkjet ink composition according to the present invention may further include at least one additive selected from surfactants, adhesion promoters, curing accelerators, thermal polymerization inhibitors, dispersants, plasticizers, fillers, antifoaming agents, dispersion aids, anti-agglomerating agents, and the like.

It is preferable to use at least 1 type selected from a silicone type surfactant and a fluorine type surfactant as said surfactant.

The additive is preferably added in an amount of 0.01 to 0.5% by weight based on the total weight of the inkjet ink composition.

The viscosity of the ink composition for an inkjet is preferably 8 to 16 cP, more preferably 12 to 14 cP so that it can be easily applied to the inkjet process. If the viscosity of the inkjet ink composition is less than 8 cP or more than 16 cP, jetting stability may be lowered.

The present invention also provides a color filter manufactured using the ink composition for the inkjet.

The color filter may be manufactured by forming a black matrix pattern on a substrate using a method known in the art and then curing the black filter to form a light blocking portion and a pixel portion partitioned by the black matrix on the substrate; Filling the pixel portion partitioned by the black matrix using the inkjet method of the inkjet ink composition of the present invention: and by curing the filled inkjet ink composition.

Although it does not specifically limit as a material as a said board | substrate, A glass substrate, a plastic substrate, another flexible substrate, etc. can be used, A transparent glass substrate with strong heat resistance is preferable.

The inkjet method is a method of discharging droplet-shaped ink in a non-contact manner to a pixel portion partitioned by the black matrix using an ink nozzle.

When the ink composition for inkjet ink is filled, it is preferable to pre-bake at 50 to 120 ° C. and then to post-bake at 220 to 280 ° C. when a thermal initiator is used. If the temperature of the thermosetting is less than 220 ℃ the evaporation and thermal curing of the solvent is insufficient to reduce the strength and chemical resistance of the film, if the temperature exceeds 280 ℃ due to excessive volumetric shrinkage of the pixel portion problems with adhesion and precision to the substrate May occur, and the formed film may be damaged by heat.

In addition, the curing of the filled inkjet ink composition is preferably performed at an exposure amount of 40 to 300 mJ / cm ² when using a photoinitiator. When the exposure amount is less than 40 mJ / cm ^{2, the} photocuring may be insufficient to reduce the strength and chemical resistance of the film. When the exposure amount is higher than 300 mJ / cm ² , the time required for the exposure process may be longer, and thus tack time may be a problem. It is preferable to further cure the ink film formed after the exposure process in a 180 to 230 ℃ oven.

In addition, the present invention provides a display device including the color filter.

The display device may have a configuration known in the art other than using the color filter according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, the following examples are provided only for the purpose of easier understanding of the present invention, and the present invention is not limited thereto.

Example  One

Benzyl acrylate, methacrylate, hydroxy ethyl methacrylate, Glycidyl Methacrylate (GMA) monomers as a binder polymer formed from a molar ratio of 30: 45: 20: 5 5 g of methoxymethyl melamine compound (cymel 303), 4.0 g of dipentaerythritol hexaacrylate (DPHA) as polymerizable monomer, 0.5 g of V40 as thermal initiator, 75 g of diethylene glycol monobutyl ether acetate as solvent, blue pigment as colorant (Pigment blue 15: 6) An ink composition for an inkjet was prepared by mixing 4.7 g of a pigment dispersant with 5.8 g and an additive for 3 hours.

Example  2

Copolymer formed with a binder polymer of tetrahydropyralyl methacrylate, styrene, methacryloxy propyl trimethoxy silane, and glycidyl methacrylate (GMA) monomer in a molar ratio of 10: 50: 40: 30. g, 5 g of hexamethoxymethyl melamine compound (cymel 303), 4.0 g of dipentaerythritol hexaacrylate (DPHA) as polymerizable monomer, 0.5 g of V40 as thermal initiator, 75 g of diethylene glycol monobutyl ether acetate as solvent, 5.8 g of a blue pigment (Pigment blue 15: 6) as a colorant and 4.7 g of a pigment dispersant were mixed for 3 hours to prepare an inkjet ink composition.

Example  3

Benzyl acrylate, methacrylate, hydroxy ethyl methacrylate, Glycidyl Methacrylate (GMA) monomers as a binder polymer formed from a molar ratio of 30: 45: 20: 5 5 g of oxybutyl melamine compound (cymel 1130), 4.0 g of dipentaerythritol hexaacrylate (DPHA) as polymerizable monomer, 0.5 g of V40 as thermal initiator, 75 g of diethylene glycol monobutyl ether acetate as solvent, blue pigment as colorant (Pigment blue 15: 6) An ink composition for an inkjet was prepared by mixing 4.7 g of a pigment dispersant with 5.8 g and an additive for 3 hours.

Comparative example  One

As a binder polymer, 4.8 g of copolymers in which benzyl acrylate, methacrylate, hydroxy ethyl methacrylate, and glycidyl methacrylate (GMA) monomers were formed in a molar ratio of 30: 45: 20: 5 Ink jet ink by mixing 9.7 g of oxymethyl melamine compound (cymel 303), 75 g of diethylene glycol monobutyl ether acetate as a solvent, 5.8 g of blue pigment (Pigment blue 15: 6) as a colorant and 4.7 g of a pigment dispersant for 3 hours. The composition was prepared.

Comparative example  2

4.8 g of copolymer in which a benzyl acrylate, methacrylate, hydroxy ethyl methacrylate and glycidyl methacrylate (GMA) monomers were formed in a molar ratio of 30: 45: 20: 5 as a binder polymer, and polymerizable Dipentaerythritol hexaacrylate (DPHA) as monomer 9.2 g V40 as thermal initiator 0.5 g as diethylene glycol monobutyl ether acetate as solvent, 5.8 g as blue pigment (Pigment blue 15: 6) as colorant and 7.2 g as pigment dispersant Was mixed for 3 hours to prepare an ink composition for an inkjet.

Comparative example  3

4.8 g of copolymer in which benzyl acrylate, methacrylate, and methacrylic acid monomer are formed in a molar ratio of 60:10:30 as a binder polymer, 9.2 g of dipentaerythritol hexaacrylate (DPHA) as a polymerizable monomer, and 0.5 g of V40 as a thermal initiator. 75 g of diethylene glycol monobutyl ether acetate as a solvent, 5.8 g of a blue pigment (Pigment blue 15: 6) as a colorant and 4.7 g of a pigment dispersant were mixed for 3 hours to prepare an inkjet ink composition.

Comparative example  4

Benzyl acrylate, styrene, methacrylic acid monomer, and dodecyl methacrylate as a binder polymer 4.8 g, hexamethoxybutyl melamine compound (cymel 1130) in a molar ratio of 60: 10: 12: 18 9.7 g, 75 g of diethylene glycol monobutyl ether acetate as a solvent, 5.8 g of a blue pigment (Pigment blue 15: 6) as a colorant and 4.7 g of a pigment dispersant were mixed for 3 hours to prepare an inkjet ink composition.

Experimental Example

Chemical resistance measurement

The following method was used to test the chemical resistance of the ink composition prepared according to the present invention.

  The ink composition solutions prepared according to Examples 1 to 3 and Comparative Examples 1 to 4 were respectively spin-coated on a glass substrate, pre-baked at about 90 ° C. for 3 minutes, and then again subjected to an IR oven ( 260-270 ° C.) was post-baked for about 2 minutes to form a film.

  The chemical resistance of each ink composition was cut into 1 cm X 5 cm color coated film formed on the glass substrate by the method described above and soaked in 16 g of 80 ° C. NMP (N-methyl pyrrolidone) for 40 minutes, followed by UV-BIS spectrometer (UV -vis spectrometer) was determined by measuring the absorbance of the pigment-eluted NMP solution. Since the blue pigment was used in the present example and the comparative example, the absorbance at 672 nm was measured. The lower the absorbance, the smaller the amount of the eluted pigment.

  Table 1 shows the experimental results for the chemical resistance and heat resistance. Looking at the results, it can be seen that the ink film comprising two or more three-dimensional network network formed through the ink composition according to the embodiment shows very excellent chemical resistance characteristics because there is almost no elution amount, the ink prepared according to the comparative example Since the film contains only one type of three-dimensional network, it can be seen that it exhibits weak chemical resistance properties compared to the ink film of the present invention.

A: binder polymer

B: melamine compound

C: polymerizable monomer having three or more ethylenic functional groups

Claims (13)

(a) a binder polymer containing an epoxy group, (b) a melamine compound represented by the following formula (1), (c) a polymerizable monomer having three or more ethylenic functional groups, (d) a polymerization initiator, (e) a colorant, and (f) An ink composition for inkjet comprising a solvent and implementing two or more three-dimensional network networks in a curing state.
[Formula 1]

Where
At least two of R ₁ , R _2, and R ₃ are an amine group, and a substituent which is not an amine group in R ₁ to R ₃ is hydrogen,
The amine groups are each independently a linear or branched alkyl having 1 to 30 carbon atoms; Linear or branched alkoxy having 1 to 30 carbon atoms; Linear or branched allyl having 3 to 30 carbon atoms; Linear or branched alkenyl having 2 to 30 carbon atoms; Linear or branched vinyl of 2 to 30 carbon atoms; Carboxyl group (COO-); Ether group (-CH ₂ OR), alcohol group (-CH ₂ OH), substituted or unsubstituted cycloalkyl having 3 to 20 carbon atoms; Substituted or unsubstituted aryl having 6 to 40 carbon atoms; Substituted or unsubstituted aralkyl having 7 to 15 carbon atoms; Substituted by a substituent selected from the group consisting of alkylaryl having 7 to 15 carbon atoms unsubstituted or substituted with a hydrocarbon,
When the substituent substituted by the said amine group is substituted by other substituents, these substituents are a C1-C30 alkyl group; Aryl groups having 6 to 40 carbon atoms; It is selected from the group consisting of a heterocyclic group and a halogen group having 3 to 40 carbon atoms. The method of claim 1, wherein the binder polymer (a) containing the epoxy group is a monomer having an epoxy group and an acrylic monomer having an epoxy group, an acrylic monomer having an ethylenic double bond in the side chain, (meth) acrylic acid ester monomer, styrene monomer and ethylenic An inkjet ink composition, characterized in that the copolymer of at least one material selected from the group consisting of silane monomers containing unsaturated defects. The ink composition of claim 2, wherein the copolymer has an amount of 5 to 30 mol% based on the total copolymer of the monomer having an epoxy group. The ink composition of claim 1, wherein the weight average molecular weight of the binder polymer (a) containing an epoxy group is 1,000 to 100,000. The ink composition of claim 1, wherein (b) the melamine compound represented by Chemical Formula 1 comprises a compound of Chemical Formula 2.
(2)

Where
R ₄ to R ₉ are each independently, linear or branched alkyl having 1 to 30 carbon atoms; Linear or branched alkoxy having 1 to 30 carbon atoms; Linear or branched allyl having 3 to 30 carbon atoms; Linear or branched alkenyl having 2 to 30 carbon atoms; Linear or branched vinyl of 2 to 30 carbon atoms; Carboxyl group (COO-); Ether group (-CH ₂ OR), alcohol group (-CH ₂ OH), substituted or unsubstituted cycloalkyl having 3 to 20 carbon atoms; Substituted or unsubstituted aryl having 6 to 40 carbon atoms; Substituted or unsubstituted aralkyl having 7 to 15 carbon atoms; It is selected from the group consisting of alkylaryl having 7 to 15 carbon atoms unsubstituted or substituted with hydrocarbon,
When R ₄ to R ₉ are substituted by other substituents, these substituents may be an alkyl group having 1 to 30 carbon atoms; Aryl groups having 6 to 40 carbon atoms; It is selected from the group consisting of a heterocyclic group and a halogen group having 3 to 40 carbon atoms. The method according to claim 1, wherein (c) the polymerizable monomer having three or more ethylenic functional groups are trimethylol ethane triacrylate, trimethylol propane triacrylate, pentaerythritol tetra acrylate, pentaerythritol triacrylate, di 1 selected from the group consisting of pentaerythritol penta acrylate, dipentaerythritol hexa acrylate, polyfunctional monomers with caprolactone, epoxy acrylates of bisphenol A derivatives, novolak-epoxy acrylate, and ures multifunctional monomers It is an inkjet ink composition characterized by the above-mentioned. The ink composition of claim 1, wherein the f) solvent has a boiling point of 150 ° C or higher. The method of claim 1, wherein f) the solvent is ethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether, diethylene glycol monoethyl ether acetate, dipropylene glycol methyl ether acetate, methoxy ethanol , Ethoxy ethanol, butoxy ethanol, butoxy propanol, ethoxy ethyl acetate, and at least one selected from the group consisting of butoxy acetate and butoxy ethyl acetate. The method according to claim 1, (a) 1 to 20% by weight of the binder polymer containing an epoxy group, (b) 1 to 20% by weight of the melamine compound represented by the following formula (1) based on the total weight of the ink composition for inkjet, (c) 3 1 to 20% by weight of the polymerizable monomer having at least one ethylenic functional group, (d) 0.1 to 5% by weight of the polymerization initiator, (e) 0.5 to 10% by weight of the colorant and (f) 40 to 90% by weight of the solvent. Ink ink composition for ink. The ink composition of claim 1, wherein the ink jet ink composition further comprises at least one additive selected from surfactants, adhesion promoters, curing accelerators, thermal polymerization inhibitors, dispersants, plasticizers, fillers, antifoaming agents, dispersion aids, anti-agglomerating agents, and the like. An ink composition for ink jet, characterized in that. The ink composition of claim 1, wherein the ink composition has a viscosity of 8 to 16 cP. The color filter formed using the ink composition for inkjets of any one of Claims 1-11. A display device comprising the color filter according to claim 12.

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