KR101273129B1 - Ink composition for color filter, color filter manufactured by using the same and liquid crystal display device having the same - Google Patents

Abstract

The present invention relates to an ink composition for a color filter comprising a) a binder polymer, b) a polymerizable compound having an ethylenically unsaturated bond, c) a thermal polymerization initiator, d) a surfactant, e) a colorant, and f) a solvent. More specifically, the addition ratio of the polymerizable compound having b) ethylenically unsaturated bond to a) the binder polymer is 1: 3 to 1: 5 in molar ratio, and includes a suitable thermal polymerization initiator and a surfactant. It provides a color filter ink composition, a color filter manufactured using the color filter ink composition and a liquid crystal display device comprising the same.

Ink composition, inkjet, film thickness, color filter

Description

Ink composition for a color filter, a color filter manufactured using the same, and a liquid crystal display device including the same, and a liquid crystal display device including the same, and a liquid crystal display device including the same.

The present invention provides a color filter ink for improving the color characteristics of a color filter by reducing the film thickness difference between a center and an edge during ink jetting, and improving characteristics such as ink persistence and spreadability. A composition, a color filter manufactured therefrom, and a liquid crystal display device including the same.

The liquid crystal display panel displays a desired image by adjusting the light transmittance of liquid crystal cells arranged in a matrix form according to image signal information. The liquid crystal display panel includes a thin film transistor substrate having a metal wiring, a color filter substrate attached to each other so as to face the thin film transistor substrate, and including a color filter, a black matrix, an overcoat layer, and a common electrode, the thin film transistor substrate, and the color. It consists of a liquid crystal layer injected between filter substrates.

In general, a color filter substrate is formed by forming a black matrix having an opening on an insulating substrate, and then repeatedly forming a color filter of RGB (Red, Green, Blue) in the opening with the black matrix as a boundary, and the color filter and the black matrix. The overcoat layer and the common electrode are laminated up to prepare them.

The color filter may be formed by spraying the color filter photosensitive liquid into the opening by an ink jet method in order to reduce the number of color filter masks and simplify the manufacturing process of the color filter substrate.

However, this method does not uniformly spray the color filter ink composition, the solvent is removed in the process of curing the liquid color filter ink composition by the drying process after the spraying the thickness of the completed color filter Can be lower than the thickness of the black matrix. That is, due to the difference in film thickness between the center part and the edge part within the same pixel, there is a problem in that the liquid crystal is not properly arranged around the black matrix so that the viewing angle is poor or light leakage occurs in the panel black state.

Accordingly, the present invention prevents the film step from occurring, and improves the characteristics such as the persistence and spreadability of the ink, the color composition ink composition for improving the color characteristics of the manufactured color filter and the color filter manufactured using the same And to provide a liquid crystal display device comprising the same.

The present invention relates to a color filter ink composition comprising a) a binder polymer, b) a polymerizable compound having an ethylenically unsaturated bond, c) a thermal polymerization initiator, d) a surfactant, e) a colorant, and f) a solvent. The a) addition ratio of the polymerizable compound having an ethylenically unsaturated bond with respect to the binder polymer b) is 1: 3 to 1: 5 in a molar ratio to provide an ink composition for a color filter.

In addition, the present invention provides a color filter manufactured using the ink composition for the color filter.

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

The ink composition for a color filter according to the present invention adjusts the addition ratio of a) the polymerizable compound having an ethylenically unsaturated bond to the binder polymer in a molar ratio of 1: 3 to 1: 5, and a thermal polymerization initiator and an interface. By using the activator together, it is possible to prevent the film step from occurring and to improve the properties such as the persistence and spreadability of the ink. Therefore, the color filter manufactured using the ink composition for color filters according to the present invention may exhibit excellent color characteristics.

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

The ink composition for color filters according to the present invention comprises a) a binder polymer, b) a polymerizable compound having an ethylenically unsaturated bond, c) a thermal polymerization initiator, d) a surfactant, e) a colorant, and a f) a solvent. An ink composition for a filter, wherein the ratio of a) the polymerizable compound having an ethylenically unsaturated bond to the binder polymer is controlled at a molar ratio of 1: 3 to 1: 5, and a suitable thermal polymerization initiator and a surfactant are prepared. It is characterized by selecting.

Here, based on 100 parts by weight of the ink composition for color filters, a) 5 to 15 parts by weight of the binder polymer, b) 15 to 75 parts by weight of the polymerizable compound having an ethylenically unsaturated bond, and c) 0.3 to 3 parts by thermal polymerization initiator 20 parts by weight, d) 0.1 to 30 parts by weight of the surfactant e) 19.5 to 70 parts by weight of the colorant and f) 0.1 to 50 parts by weight of the solvent.

The a) binder polymer may be prepared by polymerizing a composition comprising a1) a compound represented by Formula 1, a2) glycidyl (meth) acrylate, and a3) a solvent.

[Formula 1]

Provided that X is hydrogen, C1-C6 alkoxy, phenoxy, alkyl substituted or unsubstituted C1-C10 alkyl, C1-C12 alkenyl containing 1 to 3 unsaturated groups, phenyl, naphthyl, or anthra Senyl,

Y is C1-C6 alkoxy, phenoxy, C1-C10 alkylene substituted or unsubstituted by halogen, C1-C10 alkenylene, phenylene containing 1 to 3 unsaturated groups, X and Y are linked Can form a 5-6 hexagonal ring,

Z is hydrogen or C1-C10 alkyl of a straight or branched chain substituted with a carboxyl group.

Specific examples of the compound represented by Formula 1 include the compounds of Formula 2 to Formula 9 below.

[Chemical Formula 2] < EMI ID =

[Formula 4] [Formula 5]

[Formula 6] [Formula 7]

[Formula 8] [Formula 9]

The compound of Formula 1 of component a1) is a compound having an acid group and an acid anhydride group at the same time. The acid group of the compound attacks the glycidyl group of glycidyl (meth) acrylate of component a2) to cause a ring-opening reaction, wherein a (meth) acryl group and an alcohol group are simultaneously generated. The alcohol group thus produced is combined with another anhydride group of Formula 1 to produce an ester group and an acid group, which may then react with glycidyl (meth) acrylate. As the condensation reaction proceeds in this form, the molecular weight increases, and the reaction is terminated when the monomer which can be exhausted disappears. The molecular weight and acid value of the resin produced can be adjusted by changing the molar ratio of the a1) component and the a2) component. That is, the molar ratio of component a1) to component a2) can be selected from a ratio of 5 to 1 to 0.2 to 1, and as the component a1) becomes larger than the component a2), the molecular weight decreases and the unreacted component a1) Many remain and acid values are largely produced. On the contrary, when the a2) component is excessively large compared to the a1) component, the acid value becomes too small and the unreacted a2) component is left too much. Therefore, a preferable ratio can be selected from the range of 0.3-1.5 of a1) component with respect to the molar ratio 1 of a2) component.

The solvent which is the a3) component of the reaction is not particularly limited as long as the hydroxyl group does not contain a carboxylic acid group and can be selected from solvents commonly used in the art.

The reaction temperature of the condensation reaction is preferably in the range of 100 to 150 ℃, the reaction time is preferably 1 hour to 24 hours. However, in terms of productivity, 1 hour to 5 hours are more preferable.

The condensation reaction occurs more easily when a small amount of reaction catalyst is added. As the catalyst that can be used in the present invention, a conventional catalyst known in the art as a catalyst for condensation reaction can be used. For example, alkylammonium salt, triphenylphosphine, triphenylantimony, dimethylaminopyridine, etc. which are basic catalysts can be used.

In the above temperature range, since the ethylene group added through the condensation reaction may cause gelation through thermal polymerization, a thermal polymerization inhibitor suitable for the polymerization reaction may be used. Representative examples of thermal polymerization inhibitors include 4-methoxyphenol (MEHQ), 2,6-di-thibutyl-4-methylphenol (BHT), and the like.

The weight average molecular weight of the binder polymer is preferably 5,000 to 20,000. When the weight average molecular weight of the binder polymer is less than 5,000, chemical resistance or film strength may be lowered, and when the weight average molecular weight of the binder polymer is more than 20,000, diffraction may occur in a pixel to cause a film step difference.

The content of the a) binder polymer is preferably 5 to 15 parts by weight based on 100 parts by weight of the total ink composition for color filters. A) When the content of the binder polymer is less than 5 parts by weight, the curing properties of the ink, such as chemical resistance, film strength, voltage holding ratio, etc. are lowered due to the lack of a binder for curing the film, or ink on one pixel An overflow may occur before filling the to reduce the color characteristics, and if it exceeds 15 parts by weight, the viscosity of the ink composition may increase, which may make it difficult to drop onto the pixel when the ink drops (drop).

As said polymerizable compound which has b) ethylenically unsaturated bond, the monomer which has at least 1 or more addition-polymerizable unsaturated group in a molecule | numerator can be used.

B) Non-limiting examples of the polymerizable compound having an ethylenically unsaturated bond include ethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate having 2 to 14 ethylene groups, and trimethylolpropane di ( Meta) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, 2-trisacryloyloxymethylethylphthalic acid, number of propylene groups Acidic modifications of propylene glycol di (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, dipentaerythritol penta (meth) acrylate and dipentaerythritol hexa Α, β-unsaturated polyhydric alcohols such as mixtures of (meth) acrylates Compound obtained by esterifying the acid; A compound obtained by adding (meth) acrylic acid to a compound containing a glycidyl group such as trimethylolpropane triglycidyl ether acrylic acid adduct and bisphenol A diglycidyl ether acrylic acid adduct; Ester compound of the compound which has hydroxyl group or ethylenically unsaturated bond, such as phthalic acid diester of (beta) -hydroxyethyl (meth) acrylate and toluene diisocyanate adduct of (beta) -hydroxyethyl (meth) acrylate, and polyhydric carboxylic acid Or adducts with polyisocyanates; (Meth) acrylic-acid alkylesters, such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate; And 9,9'-bis [4- (2-acryloyloxyethoxy) phenyl] fluorene, and may include one or more selected from the group consisting of, but are not limited to, those known in the art. Compounds can be used.

The content of the polymerizable compound having an ethylenically unsaturated bond is preferably 15 to 75 parts by weight based on 100 parts by weight of the total ink composition for color filters. B) when the content of the polymerizable compound having an ethylenically unsaturated bond is less than 15 parts by weight, a) a viscosity increase effect due to a) the binder polymer relative to the same solid content may occur, thereby causing the ink to be pixelated, 75 Exceeding parts by weight may affect certain film properties after ink curing.

By controlling the a) binder polymer and b) the polymerizable compound having an ethylenically unsaturated bond in a molar ratio of 1: 3 to 1: 5, it is possible to prevent the membrane step from occurring. If it is out of the above range, a film thickness difference between the center portion and the edge portion of the color filter may occur, thereby degrading the color characteristics of the color filter.

The c) thermal polymerization initiator is used to polymerize the polymerizable compound having the ethylenically unsaturated bond.

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 One or more than one selected from the group consisting of yl peroxide, t-butylperoxy pivalate and 1,1'-bis- (bis-t-, butylperoxy) cyclohexane may be used, but is not limited thereto.

The c) thermal polymerization initiator is preferably added to 0.3 to 20 parts by weight based on 100 parts by weight of the total ink composition for color filters. When the content of the thermal polymerization initiator is less than 0.3 part by weight, the curing degree of the ink composition may be decreased, and when the content of the thermal polymerization initiator is more than 20 parts by weight, high temperature storage stability may be lowered.

The d) the surfactant is a component having an action of improving the spreadability, uniformity and stain removal on the substrate, it may be used at least one selected from the group consisting of a silicone-based surfactant and a fluorine-based surfactant, but is not limited thereto. no.

Specifically, the silicone-based surfactant, BYK-300, BYK-301, BYK-302, BYK-306, BYK-307, BYK-310, BYK-330, BYK-333, BYK-335, BYK-341, BYK -344, BYK-345, BYK-370 and the like can be used, and as the fluorine-based surfactants F-114, F-177, F-410, F-411, F-450, F-493, F-494, F-443, F-444, F-445, F-446, F-470, F-471, F-475, F-482, F-487, F-172D, TF-1128, TF-1127, TF- 1129, TF-1126, TF-1130, TF-1116SF, TF-1131, TF1132, TF1027SF, TF-1441, TF-1442, etc. may be used, but are not limited thereto.

It is preferable that the said d) surfactant adds 0.1-30 weight part with respect to 100 weight part of all color filter ink compositions. When the content of the surfactant is less than 0.1 parts by weight, the spreadability of the ink may be lowered, and a film difference may occur. When the content of the surfactant exceeds 30 parts by weight, the ink may overflow and be mixed with other colors.

The e) colorant is used to express the color characteristics of the ink composition for color filters. Non-limiting 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, white pigments, fluorescent pigments, etc. may also be used, but is not limited thereto.

The e) coloring agent is preferably added 19.5 to 70 parts by weight based on 100 parts by weight of the total ink composition for color filters.

The solvent f) is a solvent having a boiling point of 150 ° C. or higher, preferably 200 to 300 ° C., and non-limiting examples thereof include butyl carbitol acetate and dipropylene glycol methyl ether acetate. ether acetate) or diethylene glycol butyl methacrylate, and the like, but is not limited thereto.

The solvent f) preferably adds 0.1 to 50 parts by weight based on 100 parts by weight of the total ink composition for color filters. If the content of the solvent is less than 0.1 parts by weight, the viscosity of the ink composition may be too low for jetting, and if it exceeds 50 parts by weight, overflow may occur before reaching a constant number of drops regardless of the surfactant. overflow) can affect the color characteristics.

The ink composition for a color filter according to the present invention may include at least one additive selected from a dispersant, an adhesion promoter, an antioxidant, an ultraviolet absorber, an adhesion aid, and a leveling agent.

The additive is preferably included in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the ink composition for color filters.

Curly filter ink composition according to the present invention can be used for all of the color filter ink composition having a red (R), green (G), blue (B), in particular, a green (G) color filter ink The composition exhibits better properties.

In addition, the present invention provides a color filter manufactured using the ink composition for the color filter.

The color filter may be manufactured by a method known in the art, except that the color filter ink composition and the ink jet method according to the present invention are used.

Specifically, a metal matrix such as Cr or a black resin film is coated on the transparent substrate, and then patterned by a photolithography method to form a black matrix as a boundary other than the pixel region where the color filter is formed.

A red, green, and blue color filter can be formed by injecting and curing the ink composition for a color filter according to the present invention, which is red, green, and blue, by the inkjet method in a pixel region defined by transparent openings between partition walls. have.

The color filter according to the present invention may include a binder polymer and a polymerizable compound in a molar ratio of 1: 3 to 1: 5, and may include a thermal polymerization initiator and a surfactant together to prevent generation of a film step. In addition, it is possible to improve the color characteristics of the manufactured color filter having excellent jetting characteristics such as ink persistence or spreadability.

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

The method for manufacturing a liquid crystal display device according to the present invention can use techniques in the art except for using the ink composition for color filters of 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

As a binder polymer, 6.95 g of a polymer represented by the following formula (10), a polymerizable compound having an ethylenically unsaturated bond (DPHA: Dipenta erythritol Hexaacrylate) 17.6 g, a thermal polymerization initiator Vam110 0.5 g, KBM503 0.2 g, a surfactant BYK330 0.2 g, a coloring agent (SKHaas, G36: Y 150 = 60: 40) 52 g of butyl carbitol acetate was stirred with a solvent for 3 hours to prepare an ink composition (G331) for a color filter. (Mole ratio of binder polymer (B): polymeric compound (MM) having an ethylenically unsaturated bond = 1: 3)

[Formula 10]

 Weight average molecular weight (Mw) = 12,000

Example  2

As the binder polymer, 5.8 g of the polymer represented by the following formula (11), 16.3 g of a polymerizable compound having an ethylenically unsaturated bond (DPHA), 0.5 g of a thermal polymerization initiator V40, 0.18 g of a surfactant, 0.6 g of a surfactant BYK330, a coloring agent (SKHaas, 55 g of G36: Y 150 = 60:40) and 21 g of butylcarbitol acetate were stirred with a solvent for 3 hours to prepare an ink composition for a color filter (G390). (B / MM = 1: 3.5)

[Formula 11]

 Weight average molecular weight (Mw) = 8,000

Example  3

6 g of the polymer represented by Formula 10 as the binder polymer, 18.7 g of a polymerizable compound having an ethylenically unsaturated bond (DPHA), 0.5 g of a thermal polymerization initiator Vam110, 0.2 g of KBM503, 0.6 g of a surfactant BYK330, a coloring agent (SKHaas, G36) : Y 150 = 60: 40) 52 g of butylcarbitol acetate was stirred with a solvent for 3 hours to prepare an ink composition for color filters (G301). (B / MM = 1: 4)

Example  4

As a binder polymer, 7 g of the polymer represented by Formula 11, 15.7 g of a polymerizable compound having an ethylenically unsaturated bond (DPHA), 0.5 g of a thermal polymerization initiator V40, 0.18 g of KBM503, 0.6 g of a surfactant BYK330, a coloring agent (SKHaas, 55 g of G36: Y 150 = 60: 40) and 20 g of butylcarbitol acetate were stirred with a solvent for 3 hours to prepare an ink composition (G348) for a color filter. (B / MM = 1: 3)

Example  5

7.8 g of the polymer represented by Formula 10 as the binder polymer, 17.82 g of a polymerizable compound having an ethylenically unsaturated bond (DPHA), 0.5 g of a thermal polymerization initiator, 0.6 g of a surfactant BYK330, a coloring agent (SKHaas, G36: Y 150 = 60: 40) 62.1 g of butylcarbitol acetate was stirred with a solvent for 3 hours to prepare an ink composition (G430) for color filters. (B / MM = 1: 3)

Comparative example  One

9.2 g of the polymer represented by the formula (11) as the binder polymer, 14.1 g of a polymerizable compound having an ethylenically unsaturated bond (DPHA), 0.5 g of a thermal polymerization initiator Vam110, 0.6 g of a surfactant BYK330, a coloring agent (SKHaas, G36: Y 150) = 60:40) 47.31 g and 28 g of butyl carbitol acetate were stirred with a solvent for 3 hours to prepare an ink composition (G311) for a color filter. (B / MM = 1: 2)

Comparative example  2

10 g of the polymer mixture represented by the following formula as a binder polymer, 15.6 g of a polymerizable compound having an ethylenically unsaturated bond (DPHA), 0.5 g of a thermal polymerization initiator Vam110, 0.35 g of a surfactant R08MH, a coloring agent (SKHaas, G36: Y 150) = 60:40) 52.05 g of a butyl carbitol acetate was stirred with a solvent for 3 hours to prepare an ink composition (G270) for a color filter. (B / MM = 1: 3)

Experimental Example

Jetting Stability

Jetting stability is the ability to reproduce the ejection speed of the ink under the same printing pulse conditions, by measuring the jetting stability of the ink composition for the color Peter prepared in Examples 1 to 5, Comparative Example 1 and Comparative Example 2 It is shown in Table 1 below.

(Circle): When jetting again after 12 minutes of jetting for the first time, it has a defective rate of 5 or less in 128 nozzles.

(Triangle | delta): When jetting again after 12-minute pause after initial jetting, it has a defective rate of 10 or less in 128 nozzles.

Example 1 (G331) Example 2 (G390) Example 3 (G301) Example 4 (G348) Example 5 (G430) Comparative Example 1
(G311) Comparative Example 2 (G270) Jetting ○ ○ ○ ○ ○ △ △

Persistence

Persistence is the ability to maintain the ejection of ink stably without any ejection for a certain period of time. The experiment was conducted with a printer head having 128 ink ejection nozzles, which was performed four times (# 1 to 4 scans) for 10 minutes. The ejection of the ink was observed for all the nozzles. The sustainability evaluation was measured using the ink composition for color filters prepared in Example 3 and Comparative Example 1, the results are shown in Figure 1 and 2, respectively. 1 and 2, the vertical axis represents the drop velocity (m / s) of the ink, and the horizontal axis represents the nozzle number.

As can be seen in Figure 1, it can be seen that the ink composition for color filters according to Example 3 is uniformly ejected or dripping speed of the ink regardless of the number of scanning.

In addition, as can be seen in Figure 2, the ink composition for the color filter according to Comparative Example 1 has a large amount of non-ejection of the ink. Marking the dripping speed of the ink at 0 m / s means no ejection of the ink. Therefore, it can be seen that the ink composition for color filters according to Comparative Example 1 is not able to control a DPN (Drive Per Nozzle) because a large amount of non-emission occurs.

DPN  correction( Calibration ) ability

Driver Per Nozzle (DPN) Calibration is the ability to control the speed of all nozzles during printing to ensure that the printed pattern is uniform and prevent spots. The image of was analyzed and the speed of the liquid crystal was calculated and evaluated. The DPN calibration capability was measured using the ink composition for color filters prepared in Example 4, and the results are shown in FIG. 3.

As can be seen in Figure 3, at the start (start), the dropping speed of the ink shows a deviation of 1m / s or more. In this regard, it is possible to confirm that the ink drop speed deviation of all nozzles is stabilized within 10% while performing proper calibration process (# 1 to 4 calibration) through individual nozzle control.

Bus stop

After discharging the ink composition for color filters according to Examples 1 to 5 and Comparative Examples 1 to 2 prepared above by an inkjet method on a substrate on which a black matrix was formed, the steps of the center part and the edge part were measured, and the results are shown in Table 2 below. It was.

Example 1 (G331) Example 2 (G390) Example 3 (G301) Example 4 (G348) Example 5 (G430) Comparative Example 1
(G311) Comparative Example 2 (G270) Center part
(Center) 2.27 1.1 2.53 3.5 1.2 1.94 3.86 Edge
(Edge) 2.31 1.5 2.97 3.12 1.5 2.55 3.73 Bus stop 0 0.4 0.44 -0.38 0.3 0.61 -0.13 BM height 1.95 1.4 2.4 3.3 1.2 1.75 2.5

As can be seen in Table 2, the addition ratio of the polymerizable compound having an ethylenically unsaturated bond to the binder polymer according to the present invention is 1: 3 to 1: 5 in the molar ratio of the color filter ink composition prepared in Comparative Example 1 Compared to the ink composition for color filters, the film thickness difference is small, it can be seen that it is effective in reducing the film thickness difference. In addition, in the case of Comparative Example 2, although the film thickness difference is small, it is hardly considered to be a reduction in film thickness difference because it is formed at a position higher than the black matrix (BM).

1 is a graph illustrating the jetting sustainability of the ink composition for color filters according to Example 3 of the present invention.

2 is a graph illustrating the jetting sustainability of the ink composition for color filters according to Comparative Example 1 of the present invention.

Figure 3 is a graph observing the nozzle individual control characteristics of the ink composition for color filters according to Example 4 of the present invention.

Claims (19)

An ink composition for a color filter comprising a) a binder polymer, b) a polymerizable compound having an ethylenically unsaturated bond, c) a thermal polymerization initiator, d) a surfactant, e) a colorant, and f) a solvent, wherein the a) binder polymer B) the addition ratio of the polymerizable compound having an ethylenically unsaturated bond with respect to molar ratio of 1: 3 to 1: 5, Wherein the a) binder polymer is prepared from a composition comprising a1) a compound represented by Formula 1, a2) glycidyl (meth) acrylate, and a3) a solvent: [Formula 1]

X is hydrogen, C1-C6 alkoxy, phenoxy, C1-C10 alkyl, optionally substituted with halogen, C1-C12 alkenyl, phenyl, naphthyl, or anthracenyl containing 1 to 3 unsaturated groups , Y is C1-C6 alkoxy, phenoxy, C1-C10 alkylene substituted or unsubstituted by halogen, C1-C10 alkenylene, phenylene containing 1 to 3 unsaturated groups, X and Y are linked Can form a 5-6 hexagonal ring, Z is hydrogen or C1-C10 alkyl of a straight or branched chain substituted with a carboxyl group. delete The ink composition of claim 1, wherein the molar ratio of component a1) to component a2) is 5: 1 to 0.2: 1. The ink composition of claim 1, further comprising a reaction catalyst. The ink composition for color filters according to claim 1, further comprising a thermal polymerization inhibitor. The ink composition of claim 4, wherein the reaction catalyst is at least one selected from a basic catalyst, alkylammonium salt, triphenylphosphine, triphenylantimony, and dimethylaminopyridine. The ink composition of claim 5, wherein the thermal polymerization inhibitor is at least one selected from 4-methoxyphenol (MEHQ) and 2,6-di-thibutyl-4-methylphenol (BHT). The ink composition of claim 1, wherein the compound of Formula 1 is selected from the compounds of Formulas 2 to 9. [Chemical Formula 2] < EMI ID =

[Formula 4] [Formula 5]

[Formula 6] [Formula 7]

[Formula 8] [Formula 9]

The ink composition for color filters according to claim 1, wherein the weight average molecular weight of the a) binder resin is 5,000 to 20,000. The method according to claim 1, wherein b) the polymerizable compound having an ethylenically unsaturated bond is a compound obtained by esterifying a polyhydric alcohol with α, β-unsaturated carboxylic acid; Compounds obtained by adding (meth) acrylic acid to a compound containing a glycidyl group; An ester compound of a compound having a hydroxyl group or ethylenically unsaturated bond with a polyhydric carboxylic acid, or an adduct of polyisocyanate; (Meth) acrylic acid alkyl esters; And 9,9'-bis [4- (2-acryloyloxyethoxy) phenyl] fluorene. It is an ink composition for color filters, characterized by the above-mentioned. The method of claim 1, wherein c) the thermal polymerization initiator is 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, Ink composition for color filters, characterized in that at least two selected from the group consisting of lauroyl peroxide, t- butyl peroxy pivalate and 1,1'-bis- (bis-t-, butyl peroxy) cyclohexane . The ink composition of claim 1, wherein the d) surfactant is at least one selected from the group consisting of a silicone-based surfactant and a fluorine-based surfactant. The ink composition of claim 1, wherein the solvent f) has a boiling point of 150 ° C or higher. The color filter according to claim 1, wherein the solvent f) is butyl carbitol acetate, dipropylene glycol methyl ether acetate, or diethylene glycol butyl methacrylate. Ink composition. The method according to claim 1, based on 100 parts by weight of the ink composition for color filters, a) 5 to 15 parts by weight of the binder polymer, b) 15 to 75 parts by weight of the polymerizable compound having an ethylenically unsaturated bond, c) thermal polymerization 0.3 to 20 parts by weight of initiator, d) 0.1 to 30 parts by weight of surfactant, e) 19.5 to 70 parts by weight of colorant and 0.1 to 50 parts by weight of d) solvent. The ink composition of claim 1, wherein the ink composition for color filters further comprises at least one additive selected from dispersants, adhesion promoters, antioxidants, ultraviolet absorbers, and leveling agents. The ink composition of claim 16, wherein the additive is included in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the ink composition for color filters. The color filter manufactured using the ink composition for color filters of any one of Claims 1 and 3-17. A liquid crystal display device comprising the color filter of claim 18.

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