KR101209676B1 - A self-thermal curing copolymer and Ink composition for color filter comprising the copolymer - Google Patents

Abstract

The present invention relates to a self thermosetting copolymer and a color filter ink composition comprising the same, wherein the self thermosetting copolymer according to the present invention has an epoxy group as a repeating unit having a specific structure formed of an ethylenically unsaturated monomer and a thermopolymerizable functional group. The repeating unit having a specific structure formed of the monomer is included in a molar ratio of 1: 0.1 to 0.4. The self-curing copolymer of the present invention can be used as a binder in an ink composition for color filters containing, and the ink composition for color filters according to the present invention is suitable for an inkjet spraying method and has excellent substrate adhesion and optical properties.

Self-curing copolymer, color filter

Description

A self-thermal curing copolymer and ink composition for color filter comprising the copolymer}

The present invention relates to a self thermosetting copolymer and an ink composition for a color filter comprising the same. More specifically, the present invention relates to a self-curing copolymer suitable for manufacturing a color filter according to an inkjet method and an ink composition for a color filter including the same.

Liquid crystal displays (LCDs), which have recently increased in demand, are used in a wide range of fields as display devices for home appliances, office equipment, and industrial equipment due to advantages such as low power consumption, low weight, and high resolution. One of the core components of the liquid crystal display includes a color filter in which unit pixels in which red (R), green (G), and blue (B) subpixels, which correspond to three primary colors of light, are repeatedly formed. If the brightness is controlled by applying a color signal to each subpixel in a state where each subpixel is arranged adjacently, a specific color is displayed in the unit pixel by combining three primary colors.

1 is a plan view showing a general structure of a light emitting region of a color filter. Referring to the drawings, the emission region 10 of the color filter includes unit pixels 11 repeatedly arranged, and each unit pixel 11 includes R, G, and B subpixels 12. Each subpixel 12 is separated by a black matrix 13, and the black matrix 13 absorbs light incident from each subpixel 12 to prevent a decrease in contrast.

As a method of manufacturing a color filter, a dyeing method, a pigment dispersion method, an electrodeposition method, a printing method, and the like are used, but these color filter manufacturing methods repeat the same process three times, thus increasing the production cost and increasing the number of processes. There is a problem that the efficiency is reduced.

Therefore, in recent years, the method of the color filter using the inkjet method which can simplify a manufacturing cost and a manufacturing process, etc. is researched. 2 is a process perspective view schematically showing a color filter manufacturing method using a conventional inkjet process.

Referring to FIG. 2, first, a black matrix 21 is formed on an upper substrate 20 made of a transparent material. The black matrix 21 is formed by coating or depositing an opaque metal such as opaque resin or chromium on the upper substrate 20 and patterning the same by photolithography.

Next, the three primary colors of color ink are discharged to the sub pixel regions R, G, and B separated by the black matrix 21 using the ink jet head 22, respectively. The inkjet head 22 has R, G, and B nozzles 22R, 22G, and 22B spaced at intervals corresponding to the distance between the centers of adjacent subpixels R, G, and B, and the scan direction A ), Color ink is discharged to the R, G, and B subpixels R, G, and B. After each subpixel R, G, B is filled with color inks, the solvent contained in the color ink is volatilized during the drying process, and each subpixel R, G, B has a predetermined thickness of R, G, B. Color layers R ', G', and B 'are formed.

Most of the inks used in the inkjet process use a method of forming pixels using thermosetting resins. For example, a method of forming a pixel by jetting a coloring ink containing a thermosetting melamine resin with an ink jet (Japanese Patent Laid-Open No. Hei 9-21910), an ink jet ink for color filters containing an epoxy compound and a carboxylic acid compound resin (Japanese Patent Laid-Open) 2007-72284) and a color filter ink (Japanese Patent Laid-Open No. 2008-3420) containing a thermal polymerization initiator in an epoxy resin and curing at low temperature.

However, these thermosetting inkjet inks have a problem that the stability of the ink is lowered due to clogging of the nozzle during the inkjet process and an increase in viscosity at room temperature.

Therefore, the development of inkjet inks suitable for the inkjet process is urgent.

Therefore, the problem to be solved by the present invention is to provide a self-curing copolymer required for the manufacture of an ink composition for color filters excellent in stability without nozzle clogging to be suitable for the inkjet process.

In addition, to provide an ink composition for a color filter comprising the self-curable copolymer.

In order to solve the above problems, the self-heat curing copolymer according to the present invention is a first repeating unit represented by the following formula (1), and
Glycidyl acrylate, glycidyl methacrylate, glycidyl α-ethylacrylate, glycidyl α-n-propylacrylate, glycidyl α-n-butylacrylate, 3,4 -Epoxybutyl acrylate, 3,4-epoxybutyl methacrylate, 4,5-epoxypentyl methacrylate, 6,7-epoxyheptyl acrylate, 6,7-epoxyheptyl methacrylate, 6,7-epoxy Heptyl α-ethylacrylate, o-vinyl phenyl glycidyl ether, m-vinyl phenyl glycidyl ether, p-vinyl phenyl glycidyl ether, o-vinyl benzyl glycidyl ether, m-vinyl benzyl glycidyl Ether, p-vinyl benzyl glycidyl ether, polypropylene glycol diglycidyl ether, trimetholpropane poly glycidyl ether, 2,3-diglycidyl oxy styrene, 3,4-diglycidyl oxy Styrene, 2,4-diglycidyl oxy styrene, 3,5-diglycidyl oxy styrene, 2,6-diglycidyl jade Styrene, 5-vinyl pyrogallol triglycidyl ether, 4-vinyl pyrogallol triglycidyl ether, 2,3-dihydroxy methyl styrene diglycidyl ether, 3,4-dihydrate Hydroxy methyl styrene diglycidyl ether, 2,4-dihydroxy methyl styrene diglycidyl ether, 3,5-dihydroxy methyl styrene diglycidyl ether, 2,6-dihydroxy methyl styrene digly Any one of monomers having an epoxy group selected from the group consisting of cydyl ether, 2,3,4-trihydroxy methyl styrene triglycidyl ether, and 1,3,5-trihydroxy methyl styrene triglycidyl ether A second repeating unit formed from a mixture of two or more thereof, and a molar ratio of the first repeating unit and the second repeating unit is from 1: 0.1 to 0.4 Self thermosetting copolymer:

In Formula 1,

R ₁ is a hydrogen atom or an alkyl group having 1 to 12 carbon atoms,

R ₂ is a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, an alkoxy group, a hydroxy alkyl group, an aryl group or -COOR ₃ , wherein R ₃ is a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, an aryl group, an arylalkoxy group, aromatic It is a polyalkylene glycol group or alicyclic hydrocarbon group of 3-12 carbon atoms.

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The self thermosetting copolymer of the present invention has low viscosity and is excellent in low temperature stability. In addition, the self-curing copolymer prepared according to the present invention described above may be used as a polymer binder in the ink composition for color filters including a millbase mixture, a polymer binder and an organic solvent. The ink composition for color filters provided according to the present invention is excellent in the stability of ink, excellent in ink ejection property and ejection holding property, and thus is useful for inkjet production of color filters.

The ink composition for color filters according to the present invention includes 30 to 80 parts by weight of the millbase mixture based on 100 parts by weight of the total ink composition; 10 to 40 parts by weight of the self-curing copolymer according to the present invention; And it may be prepared in an amount of 9 to 50 parts by weight of the organic solvent.

Since the self-curing copolymer of the present invention does not have a high viscosity at room temperature, it has excellent low temperature stability and prevents nozzle clogging during the inkjet process, and thus can be effectively used in an ink composition for an inkjet process.

Moreover, since the film | membrane formed from the ink composition for color filters of this invention has the outstanding adhesiveness, color transmittance, and chemical resistance, it is useful for color filter manufacture.

Hereinafter, the present invention will be described in detail. The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

The above-described self thermosetting copolymer of the present invention includes a first repeating unit represented by Formula 1 and the second repeating unit. The first repeating unit represented by Formula 1 is formed from an ethylenically unsaturated monomer, and the second repeating unit is formed from a monomer having an epoxy group as a thermal polymerizable functional group.

In the self thermosetting copolymer of the present invention, as the ethylenically unsaturated monomer used in the preparation thereof, any ethylenically unsaturated monomer which can be used for copolymerization with the monomer having the epoxy group may be used without particular limitation. For example, acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, 2-hydroxy ethyl acrylate, 2-hydroxy ethyl methacrylate, isobornyl acrylate, benzyl acrylate, benzyl methacrylate, Styrene and the like may be used alone or in combination of two or more, but is not limited thereto.

In addition, in the self thermosetting copolymer of the present invention, the monomer having an epoxy group as the thermopolymerizable functional group used in the production of the epoxy group has a reactivity such that the self thermosetting copolymer is capable of self thermosetting, and the ratio of functional groups And the number of functional groups affects the hardness and the stability of the solution.

Specific examples of the monomer having an epoxy group can be used to distinguish the monomers according to the number of epoxy groups. As the epoxy group-containing monomer, for example, glycidyl acrylate, glycidyl methacrylate, glycidyl α-ethylacrylate, glycidyl α-n-propylacrylate, glycidyl α-n-butylacrylate, 3,4-epoxybutyl acrylate, 3,4-epoxybutyl methacrylate, 4,5 Acrylates such as epoxypentyl methacrylate, 6,7-epoxyheptyl acrylate, 6,7-epoxyheptyl methacrylate, and 6,7-epoxyheptyl α-ethyl acrylate; o-vinyl phenyl glycidyl ether, m-vinyl phenyl glycidyl ether, p-vinyl phenyl glycidyl ether, o-vinyl benzyl glycidyl ether, m-vinyl benzyl glycidyl ether, p-vinyl benzyl glyc Vinyl glycidyl ethers, such as cylyl ether, etc. can be used individually or in mixture of 2 or more types, respectively.

Examples of the monomer containing 2 to 3 epoxy groups include polypropylene glycol diglycidyl ether, trimetholpropane poly glycidyl ether, 2,3-diglycidyl oxy styrene, 3,4-diglycidyl Oxy styrene, 2,4-diglycidyl oxy styrene, 3,5-diglycidyl oxy styrene, 2,6-diglycidyl oxy styrene, 5-vinyl pyrogallol triglycidyl ether , 4-vinyl pyrogarol triglycidyl ether, 2,3-dihydroxy methyl styrene diglycidyl ether, 3,4-dihydroxy methyl styrene diglycidyl ether, 2,4-dihydroxy Methyl styrene diglycidyl ether, 3,5-dihydroxy methyl styrene diglycidyl ether, 2,6-dihydroxy methyl styrene diglycidyl ether, 2,3,4-trihydroxy methyl styrene trigly Cylyl ether, 1,3,5-trihydroxy methyl styrene triglycidyl ether, and the like, alone or in combination, respectively. It can mix and use the above.

The molar ratio of the first repeating unit represented by Formula 1 to the second repeating unit is preferably 1st repeating unit: 2nd repeating unit = 1: 0.1 to 0.4. When the molar ratio of the second repeating unit to the first repeating unit is less than 0.1, when the copolymer is cured to form a thin film, surface curing decrease occurs.

The self thermosetting copolymer of the present invention may be a random copolymer or a block copolymer, preferably a random copolymer. In addition, the weight average molecular weight (Mw) of the copolymer of the present invention is preferably 15,000 to 25,000. If the weight average molecular weight of the polymer is less than 15,000 when the copolymer is cured to form a thin film may have a problem in the degree of cure, if it is more than 25,000 may cause the problem of derivation of the ink due to the elongation of the polymer.

As a method for preparing the self-curing copolymer of the present invention, a polymerization method used in the art may be used without limitation, and one embodiment will be described below.

The ethylenically unsaturated monomer and the epoxy group-containing monomer are prepared in an amount corresponding to the molar ratio of the following repeating units. Once the monomers are prepared, a polymerization initiator is added. As a polymerization initiator, a peroxide, an azobis compound, etc. can be used, For example, t-butyl hydroperoxide, t-butyl hydroperoxide, t-butyl peroxy benzoate, 2, 2- azobis isobuty Ronitrile, 2,2-azobis-2,4-dimethylvaleronitrile, and the like, but is not limited thereto.

The content of the polymerization initiator is preferably 1 to 10 parts by weight based on 100 parts by weight of the total mass of the monomer containing the ethylenically unsaturated monomer and the epoxy group.

When the monomers and the polymerization initiator are mixed, the polymerization may proceed. In the present invention, the polymerization may be performed by a conventional polymerization method. That is, the polymerization method is not particularly limited, and polymerization methods such as radical polymerization and ionic polymerization can be used, and more specifically, a bulk polymerization method, a solution polymerization method, a suspension polymerization method, an emulsion polymerization method, etc., which exist in the polymerization initiator can be used. Can be. Although a large amount of monomers may remain in some polymerization methods, when this monomer affects the physical property of a hardened layer, you may remove a monomer by the pressure reduction removal method, the reprecipitation purification method, etc.

Since the self-curing copolymer of the present invention prepared by the production method according to the present invention is stable at room temperature (for example, 18 ° C to 25 ° C) and has a thermally polymerizable functional group, it is used as a binder in the color filter ink composition. Can be used.

Hereinafter, the ink composition for color filters provided by the present invention will be described in detail.

The ink composition for a color filter according to the present invention comprises a millbase mixture, a polymer binder and an organic solvent, and uses the above-described self-curing copolymer of the present invention as the polymer binder.

In the ink composition of the present invention, the mill-base mixture includes a colorant, a dispersant, and a glycol ether solvent, and the colorant and the dispersant are obtained in a dispersed form in the solvent.

The colorant may be classified into an organic colorant and an inorganic colorant. Examples of the organic colorant may include dyes, organic pigments, natural pigments, and the like, and inorganic pigments, extender pigments, and the like. Of these, organic pigments are preferable for use because of their high color development and high heat resistance. Organic pigments are compounds classified into pigment groups according to the C.I.; the society of dyers and colourists (C.I.), specifically those with the following color index numbers:

 Pigment Yellow No. 1, Pigment Yellow No. 12, Pigment Yellow No. 13, Pigment Yellow No. 14, Pigment Yellow No. 15, Pigment Yellow No. 16, Pigment Yellow No. 17, Pigment Yellow No. 20, Pigment Yellow No. 24, Pigment Yellow No. 31, Pigment Yellow No. 53, Pigment Yellow No. 83, Pigment Yellow No. 86, Pigment Yellow No. 93, Pigment Yellow No. 94, Pigment Yellow No. 109, Pigment Yellow 110 No., Pigment Yellow No. 117, Pigment Yellow No. 125, Pigment Yellow No. 128, Pigment Yellow No. 137, Pigment Yellow No. 138, Pigment Yellow No. 139, Pigment Yellow No. 147, Pigment Yellow No. 148, Pigment Yellow No. 150, Pigment Yellow No. 153, Pigment Yellow No. 154, Pigment Yellow No. 166, Pigment Yellow No. 173, Pigment Orange No. 13, Pigment Orange No. 31, Pigment Orange No. 36 Pigment Orange No. 38, Pigment Orange No. 40, Pigment Orange No. 42, Pigment Orange No. 43, Pigment Orange No. 51, Pigment Orange No. 55, Pigment Orange No. 73, Pigment Red No. 9, Pigment Red No. 97, Pigment Red No. 105, Pigment Red No. 176, Pigment Red No. 177, Pigment Red No. 180, Pigment Red No. 196, Pigment Red No. 215, Pigment Red No. 216, Pigment Red 224, Pigment Red 242, Pigment Red 254, Pigment Red 264, Pigment Red 265, Pigment Blue 15, Pigment Blue 15: 3, Pigment Blue 15: 4, Pigment Blue No. 15: 6, Pigment Blue No. 60, Pigment Brown No. 23, Pigment Brown No. 25, Pigment Green No. 7, and Pigment Green No. 36.

Specific examples of inorganic pigments and extender pigments include titanium oxide, barium sulfate, calcium carbonate, zinc oxide, lead sulfate, yellow lead, zinc yellow, red iron oxide (III), cadmium red, ultramarine blue, prussian blue, and chromium oxide green. , Cobalt green, and the like, and may be used alone or in combination of two or more thereof.

The content of the coloring material is 10 to 50 parts by weight, preferably 10 to 30 parts by weight based on 100 parts by weight of the whole millbase mixture, but is not limited thereto.

The dispersant according to the invention is added as needed in the millbase mixture to disperse the colorant well. As the dispersant, surfactants such as cation, anion, nonionic, amphoteric, silicon-based, fluorine-based, and polymer-based may be used. Among these surfactants, polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether and polyoxyethylene stearyl ether; Polyoxylethylene alkyl phenyl ethers; Polyethylene glycol diesters; Sorbitane fatty acid esters; Fatty acid-modified polyesters; Polymeric surfactants of tertiary amine-modified polyurethanes can be preferably used.

The content of the dispersant is 15 to 20 parts by weight based on 100 parts by weight of the colorant, but is not limited thereto.

The glycol ether solvents used in the mill base according to the invention have a boiling point of 180 ° C. to 260 ° C., especially 210 ° C. to 260 ° C., and a vapor pressure of 0.5 mmHg or less, especially 0.1 mmHg or less at room temperature, and a surface tension of 29 mN / It is preferable to use a glycol ether solvent having m or more, but the boiling point, vapor pressure and surface tension are not limited thereto.

Specific examples of such glycol ether solvents include diethylene glycol monomethyl ether, diglycol ethyl methyl ether, diethylene glycol monobutyl ether, dipropylene glycol monomethyl ether, propylene glycol diacetate, dipropylene glycol monomethyl ether. Acetate, propylene glycol-n-butyl ether acetate, dipropylene glycol-n-butyl ether, tripropylene glycol methyl ether acetate, dipropylene glycol-n-propyl ether acetate and the like can be used alone or in combination of two or more thereof. have.

When the millbase mixture is prepared as described above, it can be mixed with the self-curing copolymer and the organic solvent to obtain an ink composition for color filters. The organic solvent used at this time is preferably a glycol ether solvent that is equivalent to the solvent used in the millbase mixture. If necessary, the same solvent as that used for the millbase mixture may be used. Therefore, a glycol ether solvent having a boiling point of 180 ° C. to 260 ° C. and a vapor pressure of 0.5 mmHg or less at room temperature may be used, but is not limited thereto as long as the color filter can be manufactured by an inkjet method.

Since the organic solvent according to the present invention has a moderate drying property and evaporation property, if a single solvent or a mixed solvent containing such a solvent component at a high blending ratio is used, it does not rapidly dry at the nozzle tip of the ink head, It is possible to continue jetting without causing a sudden increase in viscosity or loading of the ink, and without adversely affecting the discharge straightness or stability of the ink. At the same time, since the drying proceeds at a suitable speed after jetting, the film surface of the ink coating surface is smooth, and the ink can be dried quickly according to the heating process, and the drying can be performed in comparison with the case of using a wetting agent or an extremely high boiling point solvent. There is little possibility that a solvent may remain in a coating film after a process.

In the ink composition for color filters of the present invention, the content of each component may be appropriately selected depending on the kind of specific components used, for example, the millbase mixture 30 to 80 with respect to 100 parts by weight of the total ink composition. It may be part by weight, 10 to 40 parts by weight of the self-curing copolymer and 9 to 50 parts by weight of the organic solvent, but is not limited thereto.

Optionally, the ink composition for color filters of the present invention may further include additives used in the art. For example, a leveling agent, a flow agent, and a viscosity control agent may be further included as necessary. Such additives such as a leveling agent and a flow agent maintain wettability when ink is discharged from an orifice of an inkjet head, and a glass substrate. It maintains the flowability of the pixels, and maintains the leveling between the colorant and the binder. Specifically, hydrocarbons such as NIKKOL BL, BC, BO, and BB series of daylight chemical company, ZONYL FSN, FSO from Dupont, (Surf Marguerite Long) S-141,145 from Asahi Glass, Japan ink chemical industry company (mega fuck) Examples of non-ionic surfactants such as F-141,144, Neo's F-200, F251, Daikin Industries' dyne DS-401,402, 3M's FC-4330, FC-4332, BYK's 306, 307, etc. Cationic, anionic and amphoteric surfactants may also be used. If necessary, one or more additives such as leveling and flow agents may be used, and the additive content is preferably less than 2 parts by weight relative to the total ink composition.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to examples. However, the embodiments according to the present invention can be modified into various other forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments of the present invention are provided to enable those skilled in the art to more fully understand the present invention.

Examples 1-3 and Comparative Examples 1-2

<Preparation of self-curing copolymer>

For Example 1, glycidyl methacrylate (GMA; 19.5 g, 9.75 wt%), an epoxy-containing monomer as a thermopolymerizable functional group, in a 3-necck round flask (250 mL), styrene (32.5 g, 16.25 wt%), 2-hydroxy ethyl methacrylate (HEMA; 13 g, 6.5 wt%) and solvent DPMA (130 g, 65 wt%) were mixed and the polymerization initiator 2,2'-azobis (2,4- Dimethyl) valeronitrile (Ciba V-65; 5 g, 7.6 parts by weight based on 100 parts by weight of monomer) was mixed until completely dissolved, followed by stirring at 400 rpm while purging an oil bath reactor set at 70 ° C. with acron gas. 4 hours).

In the case of Examples 2 to 3 and Comparative Examples 1 to 2, a copolymer was prepared in the same manner as in Example 1 with the components and contents as shown in Table 1 below.

Mass part (wt%) subject Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Monomer GMA 9.75 9.75 9.75 16.25 Styrene 16.25 19.5 21.13 16.25 16.25 MAA 8.13 HEMA 6.5 3.25 1.625 8.13 Initiator V-65
Of 100 parts by weight of monomer 7.6 (parts by weight) 7.6
(Parts by weight) 7.6
(Parts by weight) 7.6
(Parts by weight) 7.6
(Parts by weight) menstruum DPMA 65 65 65 65 65 Properties Item Viscosity (cP) 42.6 41.3 33.4 55.5 156.2 Molecular Weight (Mw) 22610 21902 20721 39219 10668

The said viscosity measuring method is the result measured at 25 degreeC using LVDV-II + (measurement range: 15-2000 cP) of Brookfiled. Molecular weight was measured using gel permeation chromatography (GPC) of Waters, the average molecular weight (Mw) was measured for the sample compared to the standard polystyrene.

Examples 4-10 and Comparative Examples 3-8

<Mill base mixture preparation>

Each component is blended with a composition as shown in Table 2 below, and milling and dispersing is carried out at a speed of 10 m / s for 12 hours using Motamil M-50 (Eiger) and zirconium oxide beads having a diameter of 0.65 mm. Thus, millbases (pigment dispersions) of each color were prepared.

Mass part (wt%) Product Name Red wheat base Green wheat base Blue millbase Coloring material CI pigment
Red 254 5.2 CI pigment
Red 177 5.2 CI pigment
Yellow 150 2.6 5 CI pigment
Green 58 7.5 CI pigment
Blue 15: 6 10.32 CI pigment
Violet 23 2.58 Dispersant EFKA6745
(EFKA company) 7.98 7.9 BYK 182
(BYK company) 9.9 menstruum DPMA 79.02 79.6 77.2

<Production of Ink Composition for Color Filters>

Using the thermosetting copolymers prepared according to Examples 1 to 3 and Comparative Examples 1 to 2, red, green, and blue color filter inks were prepared using the components and compositions shown in Table 3 below.

Taking Example 4 as an example, 60.9 parts by weight of the red mill-base prepared above, 20 parts by weight of the self-curing copolymer prepared according to Example 1, 7.6 parts by weight of the viscosity modifier diethylene glycol ethyl methyl ether 10 parts by weight of the DPMA solvent, which is the glycol ether as the main and main solvents, 1 part by weight of BYK-306, a leveling agent, and 0.5 parts by weight of FC-4330, 3M, the flow agent, were added and stirred for 2 hours, and the solid content was 20 An ink having a viscosity of about 10 cP and about 10 parts by weight was prepared.

Test Example

Using the ink prepared above, a 100mm × 100mm glass substrate was coated at 400rpm for 30 seconds, prebake at 110 ° C. for 5 minutes, postbake at 230 ° C. for 40 minutes, and then the film thickness was 1.5 μm. Form a film.

The physical properties of the ink and the physical properties of the formed film were measured as follows, and the results are shown in Table 4 below.

1. Transmittance

The film was measured for transmittance of color through a color coordinate measuring instrument (MCPD-3000) manufactured by Otsuka Electronics. Here, Y of X, Y, and Z was measured in three stimulus values.

2. Chemical resistance

In order to confirm the chemical resistance of the film, the color difference between IPA and NMP at 25 ° C. for 20 minutes was used to determine the color difference before and after the treatment using a color difference meter of Otsuka Electronics (range of color difference: O, Δ Eab when Δ Eab <3). X if ≥ 3).

3. Storage stability

In order to confirm the ink storage stability, it was measured by the viscosity. After leaving the range for one week at room temperature (18-25), the viscosity change was less than Δ1.5 cP as O, and the case above the numerical value was expressed as X.

4. Ink ejectability

UniJet's UJ200 was used to confirm the ejectability of the ink. Here, the head was SE-128 model and jetted at 70V. If the ink has straightness when jetting, it is indicated by?, And straightness is indicated, but bending occurs, O, and there is no straightness.

5. Discharge retention

The head switch was turned on / off at intervals of 10 minutes, and when the dischargeability was the same, O was indicated and when there was a change, X was indicated.

Example
4 Example
5 Example
6 Example
7 Example
8 Example
9 Example
10 Comparative Example
3 Comparative Example
4 Comparative Example
5 Comparative Example
6 Comparative Example
7 Comparative Example
8 color Red blue Red green blue Red green Red green blue Red green blue Transmittance (Y) 18.8 8.5 18.5 54 7.5 18.2 52 12 42.2 6.0 14 45.2 7.2 Chemical resistance O O O O O O O O O O X X X ink
Storage stability O O O O O O O X O X X O X Ink ejectability ? ? ? ? ? ? ? X O X X O X Discharge retention O O O O O O O X X X X O X

As shown in Table 4, it can be seen that the films formed from the stability and ejection properties of the ink according to the embodiment of the present invention are superior in various physical properties to the films formed from the stability and ejection properties of the ink of the comparative example.

The following drawings, which are attached to this specification, illustrate preferred embodiments of the present invention, and together with the contents of the present invention serve to further understand the technical spirit of the present invention, the present invention is limited to the matters described in such drawings. It should not be construed as limited.

1 is a plan view schematically showing a general structure of a light emitting region of a color filter.

2 is a process perspective view schematically showing a color filter manufacturing method using a conventional inkjet process.

Claims (12)

A first repeating unit represented by Formula 1, and Glycidyl acrylate, glycidyl methacrylate, glycidyl α-ethylacrylate, glycidyl α-n-propylacrylate, glycidyl α-n-butylacrylate, 3,4 -Epoxybutyl acrylate, 3,4-epoxybutyl methacrylate, 4,5-epoxypentyl methacrylate, 6,7-epoxyheptyl acrylate, 6,7-epoxyheptyl methacrylate, 6,7-epoxy Heptyl α-ethylacrylate, o-vinyl phenyl glycidyl ether, m-vinyl phenyl glycidyl ether, p-vinyl phenyl glycidyl ether, o-vinyl benzyl glycidyl ether, m-vinyl benzyl glycidyl Ether, p-vinyl benzyl glycidyl ether, polypropylene glycol diglycidyl ether, trimetholpropane poly glycidyl ether, 2,3-diglycidyl oxy styrene, 3,4-diglycidyl oxy Styrene, 2,4-diglycidyl oxy styrene, 3,5-diglycidyl oxy styrene, 2,6-diglycidyl jade Styrene, 5-vinyl pyrogallol triglycidyl ether, 4-vinyl pyrogallol triglycidyl ether, 2,3-dihydroxy methyl styrene diglycidyl ether, 3,4-dihydrate Hydroxy methyl styrene diglycidyl ether, 2,4-dihydroxy methyl styrene diglycidyl ether, 3,5-dihydroxy methyl styrene diglycidyl ether, 2,6-dihydroxy methyl styrene digly Any one of monomers having an epoxy group selected from the group consisting of cydyl ether, 2,3,4-trihydroxy methyl styrene triglycidyl ether, and 1,3,5-trihydroxy methyl styrene triglycidyl ether A second repeating unit formed from a mixture of two or more thereof, and a molar ratio of the first repeating unit and the second repeating unit is 1: 0.1 to 0.4, The copolymer is a self thermosetting copolymer having a weight average molecular weight of 15,000 to 25,000: [Formula 1]

In Formula 1, R ₁ is a hydrogen atom or an alkyl group having 1 to 12 carbon atoms, R ₂ is a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, an alkoxy group, a hydroxy alkyl group, an aryl group or -COOR ₃ , wherein R ₃ is a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, an aryl group, an arylalkoxy group, aromatic It is a polyalkylene glycol group or alicyclic hydrocarbon group of 3-12 carbon atoms. The method of claim 1, The repeating unit represented by Formula 1 is acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, 2-hydroxy ethyl acrylate, 2-hydroxy ethyl methacrylate, isobornyl acrylate, benzyl acrylate, Self-curing copolymer, characterized in that formed from any one or a mixture of two or more of the ethylenically unsaturated monomers selected from the group consisting of benzyl methacrylate and styrene. delete delete In the ink composition for a color filter comprising a millbase mixture, a polymer binder and an organic solvent, The polymer binder is the self-curing copolymer of claim 1 or 2, The millbase mixture is a color filter ink composition comprising a colorant, a dispersant and a glycol ether solvent. delete The method of claim 5, The colorant is a color filter ink composition, characterized in that any one or a mixture of two or more selected from the group consisting of dyes, organic pigments, natural pigments, inorganic pigments, extender pigments. The method of claim 5, The dispersing agent is any one selected from the group consisting of cationic surfactants, anionic surfactants, nonionic surfactants, amphoteric surfactants, silicone-based surfactants, fluorine-based surfactants, polymer surfactants or mixtures of two or more thereof. An ink composition for color filters. The method of claim 5, The glycol ether solvent includes diethylene glycol monomethyl ether, diglycol ethyl methyl ether, diethylene glycol monobutyl ether, dipropylene glycol monomethyl ether, propylene glycol diacetate, dipropylene glycol monomethyl ether acetate, propylene glycol-n -Glycol ether type, which is any one or a mixture of two or more selected from the group consisting of -butyl ether acetate, dipropylene glycol-n-butyl ether, tripropylene glycol methyl ether acetate, dipropylene glycol-n-propyl ether acetate It is a solvent, The ink composition for color filters characterized by the above-mentioned. The method of claim 5, The organic solvent is a color filter ink composition, characterized in that the boiling point of 180 ℃ to 260 ℃. The method of claim 5, The organic solvent is a color filter ink composition, characterized in that the glycol ether solvent. The method of claim 5, Per 100 parts by weight of the total ink composition, 30 to 80 parts by weight of the millbase mixture; 10 to 40 parts by weight of the self-curing copolymer; And 9 to 50 parts by weight of the organic solvent Ink composition for a color filter comprising a.

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