TWI734367B - Light scattering ink composition, light scattering pixel, color filter and image display device - Google Patents

Abstract

Provided are a light scattering ink composition comprising a curable monomer and a scattering particle, wherein the curable monomer comprises a bifunctional (meth)acrylate having a specific formula together with a tri- to tetrafunctional (meth)acrylate having a specific formula in a specific mixing ratio, a color filter formed using the same, and an image display device having the color filter. The light scattering ink composition exhibits excellent dispersibility of scattering particles, thereby improving jetting property, and enhances coating film hardness and coating film surface property. Therefore, the light scattering ink composition can be effectively used for preparing a color filter by an inkjet printing method.

Description

Light-scattering ink composition, light-scattering pixels, color filters and image display Display device

The present invention relates to a light-scattering ink composition, a color filter and an image display device. More specifically, the present invention relates to a light-scattering ink composition, a color filter formed using the same, and an image display device having the color filter. The light-scattering ink composition exhibits excellent dispersibility of scattering particles, thereby Improve the spray properties, and enhance the hardness of the coating film and the surface properties of the coating film.

Color filters are widely used in image devices, liquid crystal devices, etc., and their application range has been expanded.

Recently, as one of the methods for realizing color filters, a pigment diffusion method using a pigment diffusion type photosensitive resin has been applied. However, in the process of transmitting the light emitted by the light source through the color filter, a part of the light is absorbed by the color filter, resulting in a decline in light efficiency, and color reproducibility (color reproducibility) due to the nature of the pigment contained in the color filter. The problem of reproduction) reduction.

As a solution to these problems, color filters using quantum dots have been proposed. For example, Korean Patent Publication No. 10-2009-0036373 discloses replacing traditional color filters with a light-emitting layer composed of quantum dot phosphors to enhance luminous efficiency and thereby improve the display quality of the display device.

However, for a color filter containing quantum dots, the efficiency of the quantum dots (especially the efficiency of blue quantum dots) is reduced, and the performance of the color filter may be slightly degraded. Moreover, because of the high cost of blue quantum dots, there is a problem that the overall manufacturing cost increases.

Therefore, a color filter has been proposed that uses a light source to emit blue light, has a red pattern layer containing red quantum dot particles and a green pattern layer containing green quantum dot particles, and is positioned relative to the blue pattern layer. Having a transparent pattern layer that does not contain quantum dot particles, allowing red quantum dot particles to emit red light, green quantum dots to emit green light, and allowing blue light to be transmitted through the transparent pattern layer to display blue.

The transparent pattern layer is mainly made by a photolithography method, and the photolithography method uses a photosensitive resin composition containing scattering particles. The photoetching method is a preparation method including the following steps: photoetching and developing a light-shielding material film to form a partition wall pattern; spin coating method, slit coating method method), etc., coating the photosensitive resin on the partition wall; and patterning it by photoetching and developing, and then curing it. The advantage of the method is that the thickness of the coating film is uniform. However, about 70% of the coating material used to form the pattern is lost, and the installation of exposure equipment, developing equipment, curing equipment, etc. requires high costs. Moreover, because the production line is long, the production management system is difficult. Recently, with the increase of display material substrates, the cost of manufacturing process and installation equipment is expected to increase.

As an alternative to the above method, an inkjet method has been proposed. The inkjet method is a technology that uses an inkjet head to spray ink composition only on the openings between the formed partition walls to realize patterns, and can greatly reduce the manufacturing process, manufacturing time and cost. In the inkjet method using an ink composition, a specific amount of ink is ejected to the pixel opening between the partition walls, and thus a desired film thickness can be obtained.

However, because the traditional ink composition is a solvent-based composition, it contains an appropriate amount of solvent for ejection stability, so even though the printing has a uniform film thickness, the film thickness becomes thinner after curing, and there is a coating film The problem of hardness and surface properties decline.

Further, it is difficult for the scattering particles to be prepared as a solvent-free composition, which results in agglomeration of the scattering particles. Thus, due to the high viscosity (viscosity), the ejection properties are not good.

Therefore, there is a need to develop an ink composition without any solvent, which exhibits excellent dispersion of scattering particles, thereby improving jetting properties, and has excellent coating film hardness and coating film surface properties.

One object of the present invention is to provide a light-scattering ink composition that exhibits excellent dispersion of scattering particles, thereby improving jetting properties and having excellent coating film hardness and coating film surface properties.

Another object of the present invention is to provide a color filter formed using a light-scattering ink composition.

Another object of the present invention is to provide an image display device with a color filter.

According to one aspect of the present invention, a light-scattering ink composition is provided. The light-scattering ink composition includes a curable monomer and scattering particles, wherein the curable monomer includes a compound represented by the following chemical formula (1) and The compound represented by the chemical formula (2), and the compound represented by the following chemical formula (1) and the compound represented by the following chemical formula (2) have a weight percentage mixing ratio of 40:60 to 80:20.

Among them, R ¹ is an alkylene group with 1 to 20 carbon atoms, R ² is hydrogen or methyl, m is an integer from 1 to 6, and R ³ is hydrogen or carbon. Alkyl with 1 to 6 atoms, hydroxyalkyl with 1 to 6 carbon atoms, hydroxyl, or functional group represented by chemical formula (3),

R ⁴ is hydrogen or methyl, R ⁵ is alkene group with 1 to 20 carbon atoms, phenylene or cycloalkylene with 3 to 10 carbon atoms, and L is absent or For olefin groups having 1 to 6 carbon atoms, p, q, r, and n are each independently an integer of 0 to 5, and t is 0 or 1.

In an embodiment of the present invention, based on a total of 100 wt% of the light scattering ink composition, the content of the curable monomer may be 50 to 95 wt%.

In an embodiment of the present invention, the scattering particles include titanium dioxide (TiO ₂ ).

In an embodiment of the present invention, based on a total of 100 wt% of the light scattering ink composition, the content of the scattering particles may be 1 to 20 wt%.

The light scattering ink composition according to an embodiment of the present invention may further include a photopolymerization initiator.

The light scattering ink composition according to an embodiment of the present invention may contain no solvent.

According to another aspect of the present invention, a light-scattering pixel is provided, and the light-scattering pixel includes a cured product of a light-scattering ink composition.

According to another aspect of the present invention, a color filter including light scattering pixels is provided.

According to another aspect of the present invention, an image display device with a color filter is provided.

The light-scattering ink composition according to the present invention includes (meth)acrylate with a bifunctional group of a specific chemical formula and methacrylate with a tri- to tetrafunctional group of a specific chemical formula, mixed in a specific mixing ratio, In addition, the light-scattering ink composition does not have any solvent and exhibits excellent dispersibility of scattering particles, thereby improving jetting properties, and enhancing the hardness of the coating film and the surface properties of the coating film. Therefore, the light-scattering ink composition according to the present invention can be effectively used to prepare a color filter by an inkjet printing method.

The present invention will be explained in more detail below.

An embodiment of the present invention relates to a light-scattering ink composition comprising a curable monomer (A) and scattering particles (B), wherein the curable monomer (A) comprises methacrylic acid with a bifunctional group of a specific chemical formula The ester and the methacrylate having the three to four functional groups of the specific chemical formula are mixed in a specific mixing ratio.

Curable monomer (A)

In one embodiment of the present invention, the curable monomer (A) includes a compound represented by the following chemical formula (1) and a compound represented by the following chemical formula (2).

Wherein, R ¹ is an alkene group with 1 to 20 carbon atoms, R ² is hydrogen or a methyl group, m is an integer from 1 to 6, R ³ is hydrogen, an alkyl group with 1 to 6 carbon atoms, A hydroxyalkyl group having 1 to 6 carbon atoms, a hydroxyl group or a functional group represented by the chemical formula (3),

R ⁴ is hydrogen or methyl, R ⁵ is an alkene group with 1 to 20 carbon atoms, a phenylene group or a cycloalkene group with 3 to 10 carbon atoms, and L is absent or 1 to 6 carbon atoms In the alkene group, p, q, r and n are each independently an integer from 0 to 5, and t is 0 or 1.

As used herein, an alkene group with 1 to 20 carbon atoms means straight-chain or branched-chain divalent hydrocarbons, consisting of 1 to 20 carbon atoms Structure, and examples thereof may include methylene, ethylene, n-propylene, isopropyl (isopropylene), n-butylene, isobutylene, n-pentylene, n-hexylene, n-heptylene, n-hexylene But not limited to n-octylene, n-nonylene, etc.

As used herein, a cycloalkenyl group having 3 to 10 carbon atoms means a simple ring or fused ring divalent hydrocarbon, composed of 3 to 10 carbon atoms, and examples thereof may include Cyclopropylene, cyclobutylene, cyclopentylene, cyclohexylene, etc., but not limited thereto.

As used herein, an alkyl group having 1 to 6 carbon atoms means linear or branched monovalent hydrocarbons composed of 1 to 6 carbon atoms, and examples thereof may include methyl, ethyl ( ethyl), n-propyl (n-propyl), isopropyl (i-propyl), n-butyl (n-butyl), isobutyl (i-butyl), tertiary butyl (t-butyl), normal N-pentyl, n-hexyl, etc., but not limited thereto.

As used herein, a hydroxyalkyl group having 1 to 6 carbon atoms means a linear or branched hydrocarbon composed of 1 to 6 carbon atoms, this hydrocarbon is substituted by a hydroxyl group, and examples thereof may include a hydroxymethyl group (hydroxymethyl), hydroxyethyl, hydroxypropyl, etc., but not limited thereto.

As used herein, the alkene group having 1 to 6 carbon atoms means straight or branched divalent hydrocarbons composed of 1 to 6 carbon atoms, and examples thereof may include methylene, ethylene, ethylene Propylene, butylene, etc., but not limited thereto.

In the alkene group having 1 to 20 carbon atoms, phenylene group, cycloalkenyl group having 3 to 10 carbon atoms, alkyl group having 1 to 6 carbon atoms, hydroxyalkyl group having 1 to 6 carbon atoms, and In the alkene group having 1 to 6 carbon atoms, one or more hydrogen atoms may be substituted by an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, or an alkenyl group having 2 to 6 carbon atoms. Alkynyl, cycloalkyl with 3 to 10 carbon atoms, heterocycloalkyl with 3 to 10 carbon atoms, heterocycloalkyl with 3 to 10 carbon atoms (heterocycloalkyloxy) ), haloalkyl with 1 to 6 carbon atoms, alkoxy with 1 to 6 carbon atoms, thioalkoxy with 1 to 6 carbon atoms, aryl ), acyl, hydroxyl, thio, halogen, amino, alkoxycarbonyl, carboxyl, carbamoyl, Cyano (cyano), nitro (nitro) and so on substitution.

In an embodiment of the present invention, R ¹ may be an alkene group having 1 to 20 carbon atoms, preferably an alkene group having 1 to 12 carbon atoms. When R ¹ is an olefin group having 1 to 20 carbon atoms, the scattering particles have excellent dispersibility without any solvent, thereby improving spraying properties and enhancing the hardness of the coating film and the surface properties of the coating film.

In an embodiment of the present invention, m is an integer from 1 to 6, preferably from 1 to 3. If m exceeds the above range, the spray properties may deteriorate due to high viscosity.

In an embodiment of the present invention, p, q, r and n are integers from 0 to 5, preferably 0 to 3. If p, q, r, and n are out of the above range, the spray properties may be reduced due to the high viscosity.

In an embodiment of the present invention, R ³ is hydrogen, methyl, ethyl, hydroxymethyl, hydroxyl, or a functional group represented by the chemical formula (3).

Wherein, R ⁴ is hydrogen or methyl, R ⁵ is ethylene, L is absent or methylene, p, q, r and n are each independently an integer from 0 to 2, and t is 0 or 1.

The compound represented by the chemical formula (1) plays a role of enhancing the dispersibility of the scattering particles in the ink composition, thereby improving ejection properties.

Specific examples of the compound represented by the chemical formula (1) may include 1,6-hexanediol diacrylate (1,6-hexanediol diacrylate), 1,9-bisacryloyloxynonane (1,9-bisacryloyloxynonane) ), tripropyleneglycoldiacrylate and so on.

When the compound represented by the chemical formula (2) and the compound represented by the chemical formula (1) are used together in a specific mixing ratio, the compound represented by the chemical formula (2) can improve the hardness of the coating film and suppress the occurrence of wrinkles on the surface of the coating film.

Specific examples of the compound represented by the chemical formula (2) may include ethoxylated (ethoxylated) pentaerythritol tetraacrylate (EO 4mol) (NK ESTER ATM-4E, Shin Nakamura Chemical Co., Ltd.), Mixture of pentaerythritol triacrylate and pentaerythritol tetraacrylate (molar ratio 0.6:0.4) (A-TMM-3LM-N, Shin Nakamura Chemical Co., Ltd.), ethoxylated trimethylol Trimethylolpropane triacrylate (EO 3mol) (A-TMPT-3EO, Shin Nakamura Chemical Co., Ltd.), glycerin triacrylate (EO 6mol) (A-GLY-6E, Shin Nakamura Chemical Co., Ltd.), etc.

In an embodiment of the present invention, the weight percentage mixing ratio of the compound represented by the chemical formula (1) and the compound represented by the chemical formula (2) is 40:60 to 80:20. When the mixing ratio of the compound represented by the chemical formula (1) and the compound represented by the chemical formula (2) falls within the above range, the hardness of the coating film is excellent, and the occurrence of wrinkles on the surface of the coating film can be suppressed. In the mixing ratio of the compound represented by the chemical formula (1) and the compound represented by the chemical formula (2), if the content of the compound represented by the chemical formula (1) is less than the above range, the dispersibility of the scattering particles is reduced, and As a result, the spray properties may decline. If the content of the compound represented by the chemical formula (1) is more than the above range, wrinkles may appear on the surface of the coating film.

Based on a total of 100 wt% of the light scattering ink composition, the content of the curable monomer (A) may be 50 to 95 wt%, preferably 60 to 95 wt%. If the content of the curable monomer is less than 60wt%, the dispersibility of the scattering particles may decrease. If the content of the curable monomer exceeds 95wt%, the scattering effect may decline.

Scattering particles (B)

In an embodiment of the present invention, the scattering particles play a role of increasing the path of the light emitted from the blue light source, and thereby enhance the overall light efficiency.

Traditional inorganic materials can be used as scattering particles. Preferably, metal oxides can be used.

The metal oxide may be an oxide containing a metal, and the metal is selected from lithium (Li), beryllium (Be), boron (B), sodium (Na), magnesium (Mg), aluminum (Al), silicon (Si), Potassium (K), Calcium (Ca), Scandium (Sc), Vanadium (V), Chromium (Cr), Manganese (Mn), Iron (Fe), Nickel (Ni), Copper (Cu), Zinc (Zn), Gallium (Ga), Germanium (Ge), Rubidium (Rb), Strontium (Sr), Yttrium (Y), Molybdenum (Mo), Cesium (Cs), Barium (Ba), Lanthanum (La), Hafnium (Hf), W Tb (Tb), dysprosium (Dy), 鈥 (Ho), erbium (Er), 銩 (Tm), ytterbium (Yb), titanium (Ti), antimony (Sb), tin (Sn), zirconium (Zr), One of the group consisting of niobium (Nb), cerium (Ce), tantalum (Ta), indium (In), and combinations thereof, but is not limited thereto.

Specifically, the metal oxide can be selected from aluminum oxide (Al ₂ O ₃ ), _{silicon dioxide (SiO 2} ), zinc oxide (ZnO), zirconium dioxide (ZrO ₂ ), barium titanate (BaTiO ₃ ), titanium dioxide ( TiO ₂ ), tantalum pentoxide (Ta ₂ O ₅ ), titanium pentoxide (Ti ₃ O ₅ ), indium tin oxide (ITO), indium zinc oxide (IZO), antimony tin oxide (ATO), aluminum-doped oxide One of the group consisting of zinc (ZnO-Al), niobium trioxide (Nb ₂ O ₃ ), stannous oxide (SnO), magnesium oxide (MgO) or a combination thereof. If necessary, a material that is surface-treated with a compound having an unsaturated bond can be used. The compound having an unsaturated bond is, for example, acrylate.

The scattering particles may have an average particle diameter of 30 to 1000 nanometers (nm), preferably 100 to 500 nanometers, more preferably 150 to 300 nanometers. If the particle size is too small, it cannot be expected to exhibit a sufficient scattering effect of the light emitted from the blue light source. On the contrary, if the particle size is too large, the particles are trapped in the composition, or the surface of the light scattering layer with uniform quality cannot be obtained. Therefore, the particle size is appropriately controlled within the above-mentioned range.

Based on a total of 100 wt% of the light scattering ink composition, the content of the scattering particles may be 1 to 20 wt%. If the content of the scattering particles is less than 1wt%, the scattering effect may decline. If the content of the scattering particles exceeds 20wt%, the transmittance of the light scattering layer may decrease.

Photopolymerization initiator (C)

The light scattering ink composition according to an embodiment of the present invention may further include a photopolymerization initiator (C).

In an embodiment of the present invention, as long as the curable monomer can be polymerized, the use of the photopolymerization initiator (C) may not be particularly limited. In particular, from the viewpoint of polymerization properties, initiation efficiency, absorption wavelength, availability, cost, etc., it is preferable to use a compound selected from the group consisting of acetophenone ( acetophenone-based compound, benzophenone-based compound, triazine-based compound, biimidazole-based compound, oxime-based compound At least one compound in the group consisting of a based compound and a thioxanthone-based compound is used as the photopolymerization initiator (C).

Specific examples of acetophenone compounds include diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenyl-1-propanone (2-hydroxy-2-methyl-1-phenylpropan- 1-one), benzyl dimethyl ketal, 2-hydroxy-1-[4-(2-hydroxyethoxy)phenyl]-2-methyl-1-propanone (2- hydroxy-1-[4-(2-hydroxyethoxy)phenyl]-2-methylpropan-1-one), 1-hydroxycyclohexylphenylketone, 2-methyl-1-[4-(methylthio)phenyl]-2-(4-morpholinyl)-1-acetone (2- methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one), 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butan-1-one ( 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butan-1-one), 2-hydroxy-2-methyl-1-[4-(1-methylvinyl)phenyl]propane-1 -Ketone (2-hydroxy-2-methyl-1-[4-(1-methylvinyl)phenyl]propan-1-one), 2-(4-methylbenzyl)-2-(dimethylamino )-1-(4-morpholinophenyl)butan-1-one (2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinophenyl)butan-1-one) and so on.

Specific examples of benzophenone compounds include benzophenone, methyl o-benzoylbenzoate, 4-phenylbenzophenone, and 4-phenylbenzophenone. Benzyl-4'-methyldiphenylsulfide (4-benzoyl-4'-methyldiphenylsulfide), 3,3',4,4'-tetra(tert-butylperoxycarbonyl)benzophenone (3 ,3',4,4'-tetra(tert-butylperoxycarbonyl)benzophenone), 2,4,6-trimethylbenzophenone (2,4,6-trimethylbenzophenone) and so on.

Specific examples of three [口井] compounds include 2,4-bis(trichloromethyl)-6-(4-methoxyphenyl)-1,3,5-tri[口井](2,4- bis(trichloromethyl)-6-(4-methoxyphenyl)-1,3,5-triazine), 2,4-bis(trichloromethyl)-6-(4-methoxynaphthyl)-1,3, 5-Three [口井](2,4-bis(trichloromethyl)-6-(4-methoxynaphthyl)-1,3,5-triazine), 2,4-bis(trichloromethyl-6-piperonyl- 1,3,5-Three [wells] (2,4-bis(trichloromethyl)-6-piperonyl-1,3,5-triazine), 2,4-bis(trichloromethyl)-6-(4-methoxystyryl)-1, 3,5-三[口井](2,4-bis(trichloromethyl)-6-(4-methoxystyryl)-1,3,5-triazine), 2,4-bis(trichloromethyl)-6- [2-(5-Methylfuran-2-yl)vinyl]-1,3,5-三[口井](2,4-bis(trichloromethyl)-6-[2-(5-methylfuran-2 -yl)ethenyl]-1,3,5-triazine), 2,4-bis(trichloromethyl)-6-[2-(furan-2-yl)vinyl]-1,3,5-triazine) [口井](2,4-bis(trichloromethyl)-6-[2-(furan-2-yl)ethenyl]-1,3,5-triazine), 2,4-bis(trichloromethyl)- 6-[2-(4-Diethylamino-2-methylbenzene)vinyl]-1,3,5-三[口井](2,4-bis(trichloromethyl)-6-[2-( 4-diethylamino-2-methylphenyl)ethenyl]-1,3,5-triazine), 2,4-bis(trichloromethyl)-6-[2-(3,4-dimethoxyphenyl)vinyl ]-1,3,5-三[口井](2,4-bis(trichloromethyl)-6-[2-(3,4-dimethoxyphenyl)ethenyl]-1,3,5-triazine) and so on.

Specific examples of biimidazole compounds include 2,2'-bis(2-chlorobenzene)-4,4',5,5'-tetraphenylbiimidazole (2,2'-bis(2-chlorophenyl)-4 ,4',5,5'-tetraphenylbiimidazole), 2,2'-bis(2,3-dichlorobenzene)-4,4',5,5'-tetraphenylbiimidazole (2,2'-bis (2,3-dichlorophenyl)-4,4',5,5'-tetraphenylbiimidazole), 2,2'-bis(2-chlorobenzene)-4,4',5,5'-tetra(alkoxybenzene) Base) biimidazole (2,2'-bis(2-chlorophenyl)-4,4',5,5'-tetra(alkoxyphenyl)biimidazole), 2,2'-bis(2-chlorophenyl)-4,4 ',5,5'-tetra(trialkoxyphenyl)biimidazole (2,2'-bis(2-chlorophenyl)-4,4',5,5'-tetra(trialkoxyphenyl)biimidazole ), 2,2-bis(2,6-dichlorophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole (2,2-bis(2,6-dichlorophenyl) )-4,4',5,5'-tetraphenyl-1,2'-biimidazole), biimidazole compounds whose phenyl groups are substituted by alkoxycarbonyl groups at 4, 4', 5, and 5'positions, etc. In these examples, it is preferable to use 2,2'-bis(2-chlorobenzene)-4,4',5,5'-tetraphenylbiimidazole, 2,2'-bis(2,3-di Chlorobenzene)-4,4',5,5'-tetraphenylbiimidazole and 2,2-bis(2,6-dichlorobenzene)-4,4',5,5'-tetraphenyl-1 ,2'-Biimidazole.

Specific examples of oxime compounds include o-ethoxycarbonyl-α-oxyimino-1-phenylpropan-1-one (o-ethoxycarbonyl-α-oxyimino-1-phenylpropan-1-one), etc., And the commercially available products typically include Irgacure OXE 01 and OXE 02 of BASF.

Specific examples of thioxanthone compounds include 2-isopropylthioxanthone, 2,4-diethylthioxanthone, and 2,4-dichlorothioxanthone (2,4-dichlorothioxanthone), 1-chloro-4-propoxythioxanthone (1-chloro-4-propoxythioxanthone) and so on.

Based on a total of 100 wt% of the light scattering ink composition, the content of the photopolymerization initiator (C) may be 2 to 20 wt%. If the content of the photopolymerization initiator is less than 2wt%, the hardness of the coating film may decrease. If the content of the photopolymerization initiator exceeds 20wt%, yellowing may occur on the coating film.

Additive (D)

In addition to the above components, in order to enhance the smoothness or adhesion properties of the coating film, the light scattering ink composition according to an embodiment of the present invention may further include additives, such as surfactants and adhesion promoters. ).

When the light-scattering ink composition according to the present invention contains a surfactant, its advantage is that the smoothness of the coating film can be improved. For example, the surfactant can be a fluorine-based surfactant, such as BM-1000, BM-1100 (BM Chemie), Fluorad FC-135/FC-170C/FC-430 (SUMITOMO 3M Limited) ), SH-28PA/-190/-8400/SZ-6032 (Toray Silicone Co., Ltd.), but not limited to this.

Adhesion promoters can be added to increase adhesion to the substrate. The adhesion promoters can include silane coupling agents with reactive substituents. The reactive substituents are selected from carboxyl groups and methacrylic acid groups. It is a group consisting of methacryloyl group, isocyanate group, epoxy group and combinations thereof, but is not limited thereto. For example, the silane coupling agent may include trimethoxysilyl benzoic acid, γ-methacryloxypropyltrimethoxysilane, and vinyltriacetoxysilane. ), vinyltrimethoxysilane, γ-isocyanatepropyltriethoxysilane, γ-glycidoxypropyltriethoxysilane, β-(3 , 4-epoxycyclohexyl) ethyl trimethoxysilane (β-(3,4-epoxycyclohexyl) ethyltrimethoxysilane) and so on.

In addition, to the extent that the technical efficacy of the present invention is not compromised, the light scattering ink composition according to the present invention may further contain additives, such as antioxidants, ultraviolet absorbers and anti-agglomeration agents. agent). Those with ordinary knowledge in the art can appropriately add and use additives within a range that does not impair the technical effects of the present invention.

Based on a total of 100 wt% of the light scattering ink composition, the amount of additives used may be 0.05 to 10 wt%, particularly 0.1 to 10 wt%, more particularly 0.1 to 5 wt%, but is not limited thereto.

Even if the light-scattering ink composition according to an embodiment of the present invention is a solvent-free composition containing no solvent, it exhibits excellent dispersion of scattering particles and can achieve low viscosity.

Moreover, even the light-scattering ink composition according to an embodiment of the present invention does not substantially contain a resin component. Even if the resin component is included, its content is 0.5% by weight or less based on a total of 100% by weight of the light-scattering ink composition. The light-scattering ink composition according to an embodiment of the present invention does not contain a resin component, and thus can achieve low viscosity, thereby having excellent nozzle ejection properties of the ink.

An embodiment of the present invention relates to light-scattering pixels (ie, transparent pixels), and a cured product containing the above-mentioned light-scattering ink composition.

Furthermore, an embodiment of the present invention relates to a color filter including the above-mentioned light-scattering pixels.

The method for forming the pattern of the light-scattering ink composition according to the present invention includes a step of applying the light-scattering ink composition to a predetermined area by an inkjet method, and a step of curing the applied light-scattering ink composition.

First, the light-scattering ink composition of the present invention is injected into the inkjet device and printed on a predetermined area of the substrate.

The substrate is not limited, and examples thereof may include substrates with flat surfaces, such as glass substrates, silicon substrates, polycarbonate substrates, polyester substrates, aromatic polyamides Substrate, polyamideimide substrate, polyimide substrate, aluminum (Al) substrate, and gallium arsenide substrate. These substrates can be pretreated, such as chemical treatment with chemicals (chemicals are silane coupling agents for example), plasma treatment, ion plating treatment, sputtering treatment, gas phase reaction treatment and Vacuum deposition treatment. When a silicon substrate and the like are used as the substrate, charge coupled devices (CCD), thin film transistors (TFT), etc. can be formed on the surface of the silicon substrate and the like. Moreover, a partition wall matrix can be formed thereon.

In order to eject from a piezo inkjet head, an example of an inkjet device, to form an appropriate phase on the substrate, the viscosity, fluidity, and scattering particle properties should be compatible with inkjet printing. Head balance. The piezoelectric inkjet head used in the present invention is not limited, but ejects ink having a droplet size of about 10 to 100 picoliters (pL), preferably about 20 to 40 picoliters.

The viscosity of the light scattering ink composition of the present invention is preferably about 3 to 30 cP, and more preferably controlled in the range of 7 to 20 cP.

A color filter according to an embodiment of the present invention includes a transparent pattern layer (ie, a transparent pixel layer) formed by the above-mentioned pattern forming method. In other words, the color filter is characterized by including a transparent pixel layer, which is formed by applying the light-scattering ink composition to a substrate in a predetermined pattern and then curing. Since the components and preparation methods of the color filter are known in the prior art, the detailed description thereof is omitted.

An embodiment of the present invention relates to an image display device having the above-mentioned color filter.

The color filter of the present invention is not only applicable to traditional liquid crystal display devices (LCD), but also applicable to various image display devices, such as electroluminescence display devices (EL) and plasma display devices; PDP), field emission display device (FED), organic light emitting device (OLED), etc.

In addition to the above-mentioned color filter, the image display device of the present invention also includes a variety of conventional elements.

Here, the present invention will be explained in more detail through a plurality of examples, comparative examples, and experimental examples. However, these examples, comparative examples, and experimental examples are provided for illustrative purposes only, and for those skilled in the art, the scope of the present invention is obviously not limited thereto.

Preparation Example 1: Preparation of scattering particle dispersion (A1)

Use a bead mill to make titanium dioxide (Ishihara Corporation CR-63) with a particle diameter of 210 nm as scattering particles, 70.0 parts by weight (parts by weight), and DISPERBYK-2001 as a dispersant (BYK Corporation) ) 4.0 parts by weight and 26 parts by weight of 1,6-hexanediol diacrylate as a solvent were mixed and dispersed for 12 hours to prepare a scattering particle dispersion (A1).

Examples and Comparative Examples: Preparation of Light Scattering Ink Composition

The light scattering ink composition was prepared by mixing the individual components (unit: wt%) shown in Table 1 below.

A1: Scattering particle dispersion prepared in Preparation Example 1

B1: 1,6-hexanediol diacrylate (Sigma-Aldrich Corporation)

B2: 1,9-bispropenyloxynonane (TCI Co.,Ltd.)

B3: Tripropylene glycol diacrylate (Sigma-Aldrich Corporation)

B4: Ethoxylated pentaerythritol tetraacrylate (EO 4mol) (NK ESTER ATM-4E, Shin Nakamura Chemical Co., Ltd.)

B5: Mixing of pentaerythritol triacrylate and pentaerythritol tetraacrylate (molar ratio 0.6:0.4) (A-TMM-3LM-N, Shin Nakamura Chemical Co., Ltd.)

B6: Ethoxylated trimethylolpropane triacrylate (EO 3mol) (A-TMPT-3EO, Shin Nakamura Chemical Co., Ltd.)

B7: Ethoxylated glycerol triacrylate (EO 6mol) (A-GLY-6E, Shin Nakamura Chemical Co., Ltd.)

B8: Mixing of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (molar ratio 1:1) (A-9550, Shin Nakamura Chemical Co., Ltd.)

B9: isobornyl acrylate (Sigma-Aldrich Corporation)

B10: The compound of the following chemical formula (a)

C1: Irgacure OXE-01 (BASF Corporation)

D1: SH8400 (Dow Corning Toray Silicone Co., Ltd.)

Experimental example:

The physical properties of the light scattering ink compositions prepared in the Examples and Comparative Examples were evaluated by the following methods, and the results are shown in Table 2 below.

<Preparation of Light Scattering Coating Layer>

The light-scattering ink composition prepared in each example and comparative example was coated on a 5 cm (cm) × 5 cm glass substrate by inkjet method, and a 1KW high-pressure mercury vapor lamp containing all g, h, and i rays was used. -vapor lamp) was used as an ultraviolet (UV) light source and ^{irradiated at 1,000 mJ/cm 2} , and then heated in a heating furnace at 180° C. for 30 minutes to prepare a light scattering coating layer.

(1) Dispersibility

The light scattering ink composition has been prepared, and the liquid sample is confirmed with naked eyes, and the liquid sample is evaluated according to the following evaluation criteria.

<Evaluation Rules>

○: No titanium dioxide particles can be seen on the wall and bottom of the storage bottle.

×: Agglomerated titanium dioxide particles were seen on the wall and bottom of the storage bottle.

(2) Spray properties

Using an inkjet drop analysis device, the ejection properties of the ink were evaluated according to the following evaluation criteria.

<Evaluation Rules>

○: The inkjet nozzle is not clogged, and the direction of the ejected ink droplets is straight.

×: The ink jet nozzle is clogged, or the direction of the ejected ink droplets does not show a straight line.

(3) Hardness of coating film

After the heat treatment (180°C/30 minutes), the hardness properties of the coating film were confirmed by pencil hardness. According to JIS K 5400, 5600, a pencil hardness tester (Korea Sukbo Science) is used to test the pencil hardness.

A pencil manufactured by Mitsubishi Corporation for hardness evaluation in the hardness range of 6B to 6H is used as the pencil. First, confirm the impression or scratches with the naked eye, and when the impression or scratch occurs less than 2 times in 5 measurements, it is confirmed as OK. The hardness of the coating film is expressed as the maximum hardness when OK is confirmed.

(4) Surface properties of coating film

After the heat treatment (180°C/30 minutes), the surface of the coating film was observed with an optical microscope, and the surface properties of the coating film were evaluated according to the following evaluation criteria.

<Evaluation Rules>

○: No wrinkles appear on the surface of the coating film.

×: Wrinkles appear on the surface of the coating film.

As shown in Table 2, it has been confirmed that the light scattering ink compositions (comprising the compound represented by the chemical formula (1) and the compound represented by the chemical formula (2) in a specific mixing ratio) according to Examples 1 to 8 of the present invention exhibit Excellent dispersion of scattering particles, which has improved spraying properties, and exhibits excellent coating film hardness and coating film surface properties. On the other hand, the light-scattering ink compositions of Comparative Examples 1 to 7 are inferior in at least one of dispersibility, ejection properties, coating film hardness, and coating film surface properties.

In particular, the light-scattering ink composition of Comparative Example 1 (comprising the compound represented by Chemical Formula (1) but not including the compound represented by Chemical Formula (2) as a curable monomer), and the light-scattering ink composition of Comparative Example 4 The ink composition (containing a large amount of the compound represented by the chemical formula (1) not in the range of 40:60 to 80:20) is inferior in coating film hardness and coating film surface properties. Further, the light-scattering ink composition of Comparative Example 2 (comprising the compound represented by the chemical formula (2) but not containing the compound represented by the chemical formula (1) as a curable monomer), and the light-scattering ink composition of Comparative Example 3 The scattering ink composition (containing a small amount of the compound represented by the chemical formula (1) not within the range of 40:60 to 80:20) is inferior in dispersibility, ejection properties, and surface properties of the coating film. Moreover, the light-scattering ink composition of Comparative Example 5 (containing a curable monomer having 5 or more functional groups instead of the compound represented by the chemical formula (2)) is in terms of dispersibility, ejection properties, and coating film surface properties Is poor, and comparative example 6 The light-scattering ink composition (curable monomer containing a monofunctional group instead of the compound represented by the chemical formula (2)) is inferior in coating film hardness and coating film surface properties. Furthermore, for the light scattering ink composition of Comparative Example 7 (comprising the compound represented by the chemical formula (1), where m exceeds 6), it has been confirmed that its dispersibility and ejection properties are degraded.

Although specific parts of the present invention have been described in detail, it is obvious to those skilled in the art to which the present invention pertains that these specific disclosures are only preferred embodiments and the scope of the present invention is not limited thereto. In addition, those with ordinary knowledge in the technical field to which the present invention pertains will understand that various applications and modifications are possible without departing from the scope and spirit of the present invention based on the above description.

Therefore, the essential scope of the present invention will be defined by the appended claims and their equivalent scopes.

Claims (8)

A light-scattering ink composition comprising a curable monomer and a scattering particle, wherein the curable monomer is composed of a compound represented by the following chemical formula (1) and a compound represented by the following chemical formula (2), The weight percentage mixing ratio of the compound represented by the following chemical formula (1) and the compound represented by the following chemical formula (2) is 40:60 to 80:20, and based on a total of 100wt% of the light scattering ink composition, the The content of curable monomer is 50 to 95wt%,

Wherein, R ¹ is an alkylene group with 1 to 20 carbon atoms, R ² is hydrogen or methyl, m is an integer from 1 to 6, and R ³ is hydrogen, carbon Alkyl with 1 to 6 atoms, hydroxyalkyl with 1 to 6 carbon atoms, hydroxyl, or functional group represented by chemical formula (3),

R ⁴ is hydrogen or methyl, R ⁵ is alkene group with 1 to 20 carbon atoms, phenylene or cycloalkylene with 3 to 10 carbon atoms, and L is absent or For olefin groups having 1 to 6 carbon atoms, p, q, r, and n are each independently an integer of 0 to 5, and t is 0 or 1. The light scattering ink composition according to claim 1, wherein the scattering particles comprise titanium dioxide (TiO ₂ ). The light scattering ink composition according to claim 1, wherein the content of the scattering particles is 1 to 20 wt% based on a total of 100 wt% of the light scattering ink composition. The light-scattering ink composition according to claim 1, further comprising a photopolymerization initiator. The light-scattering ink composition according to claim 1, wherein the light-scattering ink composition contains no solvent. A light-scattering pixel comprising the cured product of the light-scattering ink composition according to any one of claims 1 to 5. A color filter comprising the light scattering pixels as described in claim 6. An image display device having the color filter described in claim 7.