TWI606097B - Ink composition for forming pattern, light guide plate, light emitting unit and liquid crystal display device - Google Patents

Description

Ink composition for pattern formation, light guide plate, light emitting unit, and liquid crystal display element

The present invention relates to a composition for forming an ink, a light guide plate, a light-emitting unit, and a liquid crystal display element, and more particularly to an ink composition for pattern formation having excellent adhesion to a glass substrate and good adhesion stability. , light guide plate, light emitting unit and liquid crystal display element.

Liquid crystal panels have been widely used in display devices such as personal computers, televisions, and portable telephones. Generally, a backlight module as a light source is provided in the display device to enable the display device to display an image normally. In recent years, in order to meet the requirements of consumers for the weight reduction and miniaturization of thin liquid crystal displays, a side light backlight module disposed at one end of the light guide plate and forming a surface light source by total reflection is gradually replaced. A direct-type backlight module with an additional reflector.

Generally, in the edge-light type backlight module, in order to avoid total reflection of light, a reflective pattern may be disposed on the bottom surface of the light guide plate, so that the light generates irregular scattering and reflection inside the light guide plate, thereby guiding the light uniformly. The light exiting surface is scattered to achieve a uniform light output. In the conventional edge-light type backlight module, most of the plastic materials are used as the light guide plate, but the plastic light guide plate is susceptible to deformation due to the influence of hot air and humidity, and changes its dimensional appearance, thereby impairing its optical performance, and lacking super The dimensional stability required for thin liquid crystal displays. Therefore, in the application of the ultra-thin liquid crystal display, the related art proposes to replace the plastic light guide plate with a glass light guide plate, which can solve the above problems. However, in the prior art in which a conventional plastic light guide plate is used to form a reflective pattern, the reflective pattern has a problem that the adhesion to the glass substrate is poor and the adhesion stability is poor. Therefore, how to improve the adhesion and adhesion stability of the ink to the glass substrate is a problem to be solved in the technical field.

The present invention provides an ink composition for pattern formation, which has a reflection pattern which has good adhesion and adhesion stability to a glass substrate.

The invention further provides a light guide plate, a light emitting unit and a liquid crystal display element, which have better optical characteristics.

An ink composition for pattern formation of the present invention includes a (meth)acrylate resin (A), a melamine-based bridging agent (B), a solvent (C), and a filler (D). Here, the (meth) acrylate-based resin (A) includes a monomer unit of the ethylenically unsaturated monomer (a1) represented by the formula (1) and a first hydroxyl group-containing ethylenically unsaturated monomer (a2). Monomer unit; [formula (1)] In the formula (1), X represents a residual group of a diacid or an acid anhydride, and Y represents a residual group of a second hydroxyl group-containing ethylenically unsaturated monomer.

In an embodiment of the invention, the diacid or anhydride is selected from the group consisting of succinic acid, succinic anhydride, maleic acid, maleic anhydride, phthalic acid, phthalic anhydride, and hexahydroortylene. At least one of the group consisting of formic acid and hexahydrophthalic anhydride.

In an embodiment of the invention, the second hydroxyl group-containing ethylenically unsaturated single system is selected from the group consisting of 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, (methyl). At least one of the group consisting of 4-hydroxybutyl acrylate, glycerol mono(meth) acrylate, 4-hydroxyvinyl benzene, and 1-ethynyl-1-cyclohexanol.

In an embodiment of the invention, the first hydroxyl group-containing ethylenically unsaturated monomer (a2) is selected from the group consisting of 2-hydroxyethyl (meth)acrylate and 2-hydroxypropyl (meth)acrylate. At least one of the group consisting of 4-hydroxybutyl (meth)acrylate, glycerol mono(meth)acrylate, 4-hydroxyvinylbenzene, and 1-ethynyl-1-cyclohexanol.

In an embodiment of the invention, the (meth) acrylate-based resin (A) further includes a monomer unit capable of copolymerizing the monomer (a3).

In an embodiment of the invention, the melamine-based bridging agent (B) is at least one selected from the group consisting of alkoxymethylated melamine and methylolated melamine.

In an embodiment of the invention, the melamine bridging agent (B) is selected from the group consisting of hexamethoxymethyl melamine, hexaethoxymethyl melamine, hexabutoxymethyl melamine, pentamethoxymethyl At least one of the group consisting of melamine, tetramethoxymethyl melamine, and hexamethylol melamine.

In an embodiment of the invention, the solvent (C) includes diethylene glycol dimethyl ether, propylene glycol monomethyl ether, ethyl ethoxy propionate, cyclohexanone, dimethyl glutarate or 2-(2-Butoxyethoxy)ethyl acetate.

In an embodiment of the invention, the filler (D) comprises polymethyl methacrylate bridging resin particles or cerium oxide particles.

In one embodiment of the present invention, the monomer of the ethylenically unsaturated monomer (a1) represented by the formula (1) is 100% by weight based on all the monomer units of the (meth) acrylate-based resin (A). The unit is from 3% by weight to 34% by weight, the monomer unit of the first hydroxyl group-containing ethylenically unsaturated monomer (a2) is from 1% by weight to 23% by weight, and the monomer unit of the copolymerizable monomer (a3) It is from 60% by weight to 75% by weight.

In one embodiment of the present invention, the monomer of the ethylenically unsaturated monomer (a1) represented by the formula (1) is 100% by weight based on all the monomer units of the (meth) acrylate-based resin (A). The unit is from 3% by weight to 29% by weight, the monomer unit of the first hydroxyl group-containing ethylenically unsaturated monomer (a2) is from 6% by weight to 23% by weight, and the monomer unit of the monomerizable monomer (a3) It is from 60% by weight to 75% by weight.

In one embodiment of the present invention, the ink composition for pattern formation is 100 parts by weight, and the content of the (meth) acrylate resin (A) is 15 parts by weight to 35 parts by weight, and the melamine-based bridging agent (B) The content is from 5 parts by weight to 20 parts by weight, the solvent (C) is from 40 parts by weight to 60 parts by weight, and the filler (D) is contained in an amount of from 5 parts by weight to 20 parts by weight.

In an embodiment of the invention, the pattern forming ink composition further includes a hardening accelerator (E) or a tackifier (F).

The invention further provides a light guide plate comprising a light-emitting surface, a bottom surface having a reflective pattern with respect to the light-emitting surface, and a light-incident surface connected between the light-emitting surface and the bottom surface. The reflection pattern is formed of the above-described ink composition for pattern formation.

The present invention further provides a light emitting unit including a light emitting source and the above light guiding plate. The light guide plate is disposed on one side of the light source.

The present invention further provides a liquid crystal display element including a liquid crystal panel and the above-described light emitting unit. The light emitting unit is disposed on one side of the liquid crystal panel.

Based on the above, the ink composition for pattern formation of the present invention comprises a monomer unit containing an ethylenically unsaturated monomer represented by the formula (1) and a monomer unit of a hydroxyl group-containing ethylenically unsaturated monomer (meth). Acrylate resin. Therefore, when the ink composition is used to form a reflective pattern, the reflective pattern has better adhesion and adhesion stability to the glass substrate, so that the light guide plate, the light-emitting unit, and the liquid crystal display element including the reflective pattern are used. Good optical properties.

The above described features and advantages of the invention will be apparent from the following description.

Hereinafter, embodiments of the invention will be described in detail. However, these embodiments are illustrative, and the disclosure of the present invention is not limited thereto.

In an embodiment of the invention, the ink composition for pattern formation includes a (meth) acrylate resin (A), a melamine bridging agent (B), a solvent (C), and a filler (D). Further, in an embodiment of the present invention, the ink composition for pattern formation may be further selectively added to the hardening accelerator (E) or the tackifier (F).

It is to be noted that, in the specification and the scope of the patent application, the term "(meth)acrylic acid" means "acrylic acid and/or methacrylic acid"; the term "(meth)acrylate" means "acrylate" and/or Or methacrylate"; the term "monomer unit" means a structural unit formed by polymerization of a monomer; and the term "residue group" means a residual structure formed by reaction of a compound.

The present embodiment will be described below, but the present invention is not limited thereto.

( methyl ) Acrylate resin (A)

The (meth) acrylate-based resin (A) of the present invention comprises a monomer unit of the ethylenically unsaturated monomer (a1) represented by the formula (1) and a first hydroxyl group-containing ethylenically unsaturated monomer (a2). Monomer unit. In the present embodiment, the (meth) acrylate-based resin (A) further includes a monomer unit which can copolymerize the monomer (a3).

In the present embodiment, the ink composition for pattern formation is 100 parts by weight, and the content of the (meth) acrylate resin (A) is, for example, 15 parts by weight to 35 parts by weight, and preferably 24 parts by weight to 32 parts by weight. Parts by weight.

formula (1) Ethylene unsaturated monomer (a1)

The ethylenically unsaturated monomer (a1) represented by the formula (1) of the present invention, [formula (1)] (1) In the formula (1), X represents a residual group of a diacid or an acid anhydride, and Y represents a residual group of a second hydroxyl group-containing ethylenically unsaturated monomer.

The ethylenically unsaturated monomer (a1) represented by the formula (1) of the present embodiment is, for example, obtained by esterification reaction of a diacid or an acid anhydride with a second hydroxyl group-containing ethylenically unsaturated monomer.

More specifically, the ethylenically unsaturated monomer (a1) represented by the formula (1) of the present embodiment is, for example, an acid anhydride group selected from a carboxylic acid group or an acid anhydride of a diacid and a second hydroxyl group-containing ethylenic unsaturated group. The hydroxyl group of the monomer is obtained by esterification reaction.

The diacid of the present embodiment is, for example, at least one selected from the group consisting of succinic acid, maleic acid, phthalic acid, and hexahydrophthalic acid.

The acid anhydride of the present embodiment is, for example, at least one selected from the group consisting of succinic anhydride, maleic anhydride, phthalic anhydride, and hexahydrophthalic anhydride.

The second hydroxyl group-containing ethylenically unsaturated monomer of the present embodiment is, for example, selected from the group consisting of 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate. At least one of the group consisting of esters, glycerol mono(meth)acrylate, 4-hydroxyvinylbenzene, and 1-ethynyl-1-cyclohexanol.

The ethylenically unsaturated monomer (a1) represented by the formula (1) of the present embodiment is, for example, selected from the group consisting of 2-methyl propylene ethoxylate succinate (Mono-2-(Methacryloyloxy)ethyl succinate), 2 -Mono-2-(Acryloyloxyethylethyl succinate), 2-methyl propylene ethoxylate maleate (Mono-2-(Methacryloyloxy)ethyl maleate), 2-propene Mono-2-(Acryloyloxyethylethyl ateate), 2-methyl propylene ethoxylate phthalate (Mono-2-(Methacryloyloxy)ethyl phthalate), 2-propene Mono-2-(Acryloyloxy)ethyl phthalate, 2-methyl propylene ethoxy hexahydrophthalate (Mono-2-(Methacryloyloxy)ethyl hexahydrophthalate) And at least one of the group consisting of 2-o-(Acryloyloxy)ethyl hexahydrophthalate.

In the present embodiment, the monomer unit based on the (meth) acrylate-based resin (A) is 100% by weight, and the monomer unit of the ethylenically unsaturated monomer (a1) represented by the formula (1) is, for example, From 3% by weight to 34% by weight, preferably from 3% by weight to 29% by weight, and more preferably from 3% by weight to 25% by weight.

First hydroxyl-containing ethylenically unsaturated monomer (a2)

The first hydroxyl group-containing ethylenically unsaturated monomer (a2) of the present embodiment is, for example, selected from the group consisting of 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, and (meth)acrylic acid 4. At least one of the group consisting of hydroxybutyl ester, glycerol mono(meth)acrylate, 4-hydroxyvinylbenzene, and 1-ethynyl-1-cyclohexanol. The monomer unit of the first hydroxyl group-containing ethylenically unsaturated monomer (a2) is from 1% by weight to 23% by weight based on 100% by weight of all the monomer units of the (meth) acrylate-based resin (A). It is preferably from 6% by weight to 23% by weight, and more preferably from 7% by weight to 23% by weight.

Copolymerizable monomer (a3)

The copolymerizable monomer (a3) of the present embodiment may include, but is not limited to, (meth)acrylic acid, methyl (meth)acrylate, styrene, n-butyl acrylate or other suitable monomers. In the present embodiment, the total monomer unit based on the (meth) acrylate-based resin (A) is 100% by weight, and the monomer unit of the copolymerizable monomer (a3) is, for example, 60% by weight to 75% by weight.

Melamine bridging agent (B)

The melamine-based bridging agent (B) of the present embodiment is, for example, at least one selected from the group consisting of alkoxymethylated melamine and methylolated melamine.

The alkoxymethylated melamine of this embodiment is, for example, selected from the group consisting of hexamethoxymethyl melamine, hexaethoxymethyl melamine, hexabutoxymethyl melamine, pentamethoxymethyl melamine, and tetramethoxy. At least one of the group consisting of methyl melamine.

The methylolated melamine of the present embodiment is, for example, at least one selected from the group consisting of dimethylol melamine, trimethylol melamine, tetramethylol melamine, pentamethylol melamine, and hexamethylol melamine. By.

In the present embodiment, the melamine-based bridging agent (B) is, for example, selected from the group consisting of hexamethoxymethyl melamine, hexaethoxymethyl melamine, hexabutoxymethyl melamine, pentamethoxymethyl melamine, and tetramethyl At least one of the group consisting of oxymethyl melamine and hexamethylol melamine. In the present embodiment, the content of the melamine-based bridging agent (B) is, for example, 5 parts by weight to 20 parts by weight based on 100 parts by weight of the ink composition for pattern formation.

Solvent (C)

The solvent (C) of the present embodiment may include, but is not limited to, diethylene glycol dimethyl ether, propylene glycol monomethyl ether, ethyl ethoxy propionate, cyclohexanone, dimethyl glutarate or acetic acid 2- (2-Butoxyethoxy)ethyl ester or the like. In the present embodiment, the content of the solvent (C) is, for example, 40 parts by weight to 60 parts by weight based on 100 parts by weight of the ink composition for pattern formation.

Filler (D)

In the ink composition for pattern formation of the present invention, the filler (D) acts as a light diffusing agent to sufficiently scatter and reflect light. The filler of this embodiment contains organic particles and inorganic particles.

The organic particles are selected from the group consisting of epoxy resins, melamine resins, urea resins, (meth)acrylate bridge resins, polyorganosiloxane chains resins, phenolic resins, polyamidene resins, and poly At least one of a group consisting of a amide-based resin, a polyester-based resin, and a Teflon-based resin. The (meth) acrylate bridging resin is, for example, a bridging polymer having a spherical structure, and is solvent-insoluble and can be dispersed in the prepared ink for a light guide plate.

The inorganic particles are selected from the group consisting of alumina, ceria, magnesia, iron oxide, titanium dioxide, zinc oxide, tin oxide, antimony nitride, aluminum nitride, barium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate, and citric acid. At least one of the group consisting of calcium, aluminum silicate, zirconium silicate, and potassium titanate. Preferably, the inorganic particles are cerium oxide.

In the present embodiment, the content of the filler (D) is, for example, 5 parts by weight to 20 parts by weight based on 100 parts by weight of the ink composition for pattern formation.

Hardening accelerator (E)

The hardening accelerator (E) of the present embodiment may include, but is not limited to, p-Toluenesulfonic acid (PTSA) or the like.

Tackifier (F )

The tackifier (F) of the present embodiment may include, but is not limited to, cellulose acetate butyrate (abbreviation: CAB381-20, manufactured by Ashkin Chemical Co., Ltd.) and the like.

In the present embodiment , the method for producing the ink composition for pattern formation is, for example, a (meth) acrylate-based resin (A), a melamine-based bridging agent (B), a solvent (C), and a filler (D). Stirring is carried out in a stirring device, and if necessary, a hardening accelerator (E) or a tackifier (F) may be added to stir evenly, and after kneading, a pattern forming ink composition may be obtained.

The ink composition for pattern formation of the present invention will be more specifically described below with reference to a number of experiments. Although the following experiments are described, the materials used, the amounts and ratios thereof, the processing details, the processing flow, and the like can be appropriately changed without departing from the scope of the invention. Therefore, the invention should not be construed restrictively based on the experiments described below. The invention will be described in detail below by way of examples, but the invention is not limited by the examples.

The (meth) acrylate resin (A) used in the experimental examples and the comparative examples was prepared as follows:

( methyl ) Acrylate resin (A) Synthesis example

Synthesis Example A1 to Synthesis Example A8 of (meth)acrylate resin (A) will be described below:

<Synthesis Example A1>

33.25% by weight of 2-methylpropenyl ethoxy succinate (HOMS for short), 1.25 % by weight of 2-hydroxyethyl methacrylate (2-HEMA for short), 48.70% by weight of methacrylic acid Ester (MMA for short), 10.47% by weight of n-butyl acrylate (abbreviated as n-BA), 6.33 wt% of styrene (SM for short), 185.7 wt% of cyclohexanone (CHN for short) and 1% by weight of azo Diisovaleronitrile (abbreviated as AMBN), stirred uniformly by a star stirring device (model: ARB-310, manufactured by THINKY), and subjected to thermal polymerization at 80 ° C. After 8 hours of reaction, (meth)acrylic acid can be obtained. Ester resin (A1) solution (solid concentration: 35%).

<Synthesis Example A2 to Synthesis Example A8>

The (meth) acrylate resin (A) of Synthesis Example A2 to Synthesis Example A8 was prepared in the same manner as in Synthesis Example A1, except that the types and amounts of monomers used for copolymerization in the respective synthesis examples were different. . The types and amounts of monomers used for copolymerization in each of the synthesis examples are shown in Table 1. Among them, the white mist was precipitated in the synthesis of Synthesis Example A8, and therefore no subsequent experiments were carried out.

[Table 1]         <TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> Composition (% by weight) </td><td> Ethylene represented by formula (1) Unsaturated monomer (a1) </td><td> The first hydroxyl group-containing ethylenically unsaturated monomer (a2) </td><td> copolymerizable monomer (a3) </td></ Tr><tr><td> Synthesis Example </td><td> HOMS </td><td> 2-HEMA </td><td> MAA </td><td> MMA </td><td > n-BA </td><td> SM </td></tr><tr><td> A1 </td><td> 33.25 </td><td> 1.25 </td><td> - </td><td> 48.70 </td><td> 10.47 </td><td> 6.33 </td></tr><tr><td> A2 </td><td> 28.00 </ Td><td> 5.00 </td><td> - </td><td> 50.20 </td><td> 10.47 </td><td> 6.33 </td></tr><tr>< Td> A3 </td><td> 24.50 </td><td> 7.50 </td><td> - </td><td> 51.20 </td><td> 10.47 </td><td> 6.33 </td></tr><tr><td> A4 </td><td> 8.75 </td><td> 18.75 </td><td> - </td><td> 55.70 </ Td><td> 10.47 </td><td> 6.33 </td></tr><tr><td> A5 </td><td> 3.50 </td><td> 22.50 </td>< Td> - </td><td> 57.20 </td><td> 10.47 </td><td> 6.33 </td></tr><tr><td> A6 </td><td> - </td><td> 20.00 </td><td> 7.00 </td><td> 56.20 </td>< Td> 10.47 </td><td> 6.33 </td></tr><tr><td> A7 </td><td> - </td><td> 27.00 </td><td> - </td><td> 56.20 </td><td> 10.47 </td><td> 6.33 </td></tr><tr><td> A8 </td><td> - </td ><td> - </td><td> 27.00 </td><td> 56.20 </td><td> 10.47 </td><td> 6.33 </td></tr></TBODY>< /TABLE>HOMS: 2-Methylacryloyloxyethyl succinate 2-HEMA: 2-Hydroxyethyl methacrylate MAA: A Methacrylic acid MMA: Methyl methacrylate n-BA: n-Butyl acrylate SM: Styrene       

Example 1 Preparation

57 parts by weight of a (meth) acrylate resin (abbreviated as A1) solution of Synthesis Example A1 (solid content: 35%), 18 parts by weight of hexamethoxymethyl melamine (abbreviated as B1), 13 weight a portion of diethylene glycol dimethyl ether (abbreviated as C1) and 6 parts by weight of polymethyl methacrylate bridge resin particles (abbreviated as D1), which are uniformly stirred by a star-shaped stirring device, and then a three-roller machine ( Model: FC-90mm, manufactured by Fans Co., Ltd.) After kneading for 3 hours, an ink composition for pattern formation can be obtained.

Example 2 To the embodiment 8

The ink compositions for pattern formation of Examples 2 to 8 were prepared in the same manner as in Example 1, except for the types and amounts of the components used in the respective experimental examples. The types and amounts of components used in the respective experimental examples are shown in Table 2.

Comparative example 1 To comparative example 2

The ink composition for pattern formation of Comparative Example 1 to Comparative Example 2 was prepared in the same manner as in Example 1, and the difference was in the kind and amount of the components used in the respective comparative examples. The types and amounts of components used in the respective comparative examples are shown in Table 2.

The adhesion and adhesion stability of the ink composition for pattern formation prepared in the above experiment were measured by the following measurement methods, and the results are shown in Table 2.

<adhesiveness>

The ink composition for pattern formation was applied onto a glass substrate of 10 cm × 10 cm × 3 mm to form a coating film having a film thickness of 50 μm, and dried at 120 ° C for 20 minutes, and then, according to the method of JIS K5600, at 10 On the surface of the block pattern of cm × 10 cm, 10 squares of 10 squares × 10 squares were cut with a cutter. After that, the 600 tape manufactured by 3M Company was adhered to the printing surface, and then peeled off sharply, and the number of remaining squares was evaluated. The evaluation criteria were as follows: 5B: no square falling off; 4B: 0% < shedding The number of squares is 5%; 3B: 5% < the number of squares falling off ≦ 15%; 2B: 15% < the number of squares falling off ≦ 35%; 1B: 35% < the number of squares falling off ≦ 65%; 0B: 65% < the number of squares dropped off ≦ 100%. ○: Hundreds of tests ≧ 4B △: 4B> Hundreds of tests ≧ 2B ╳: Hundreds of tests <2B

<tightness stability>

The pattern forming ink composition was coated on a glass substrate of 10 cm x 10 cm x 3 mm to form a coating film having a film thickness of 50 μm, dried at 120 ° C for 20 minutes, and then placed at 60 ° C / 90% relative Under the conditions of humidity, after 24 hours, the evaluation was carried out by the method of adhesion as described above. ○: Hundreds of tests ≧ 3B △: 3B> Hundreds of tests ≧ 1B ╳: Hundreds of tests < 1B

[Table 2]         <TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> </td><td> </td><td> Example </td>< Td> Comparative Example</td></tr><tr><td> Composition (parts by weight) </td><td> </td><td> 1 </td><td> 2 </td ><td> 3 </td><td> 4 </td><td> 5 </td><td> 6 </td><td> 7 </td><td> 8 </td>< Td> 1 </td><td> 2 </td></tr><tr><td> (meth)acrylate resin</td><td> A1 </td><td> 20 < /td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </td ><td> - </td><td> - </td><td> - </td></tr><tr><td> A2 </td><td> - </td><td > 22 </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </td></tr><tr><td> A3 </td><td> - </td><td> - </td ><td> 24 </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </td>< Td> - </td><td> - </td></tr><tr><td> A4 </td><td> - </td><td> - </td><td> - </td><td> 26 </td><td> - </td><td> 30 </td><td> 32 </td><td> 35 </td><td> - </ Td><td> - </td></tr><tr><td> A5 </td><td> - </td><td> - </td><td> - </td>< Td> - </td><td> 28 </td><t d> - </td><td> - </td><td> - </td><td> - </td><td> - </td></tr><tr><td> A6 </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </ Td><td> - </td><td> - </td><td> 26 </td><td> - </td></tr><tr><td> A7 </td>< Td> - </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </td><td> 26 </td></tr><tr><td> melamine bridging agent</td><td> B1 </td><td> 18 </td><td> - </td><td> - </td><td> 12 </td><td> 12 </td><td> 12 < /td><td> 8 </td><td> - </td><td> 12 </td><td> 12 </td></tr><tr><td> B2 </td> <td> - </td><td> 15 </td><td> - </td><td> - </td><td> - </td><td> - </td><td > - </td><td> - </td><td> - </td><td> - </td></tr><tr><td> B3 </td><td> - < /td><td> - </td><td> 12 </td><td> - </td><td> - </td><td> - </td><td> - </td ><td> - </td><td> - </td><td> - </td></tr><tr><td> B4 </td><td> - </td><td > - </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </td><td> 6 </td><td> - </td><td> - </td></tr><tr><td> Solvent</td><td> C1 </td><td> 1 3 </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </td><td> 13 < /td><td> - </td><td> - </td><td> - </td></tr><tr><td> C2 </td><td> - </td> <td> - </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </td><td > 12 </td><td> - </td><td> - </td></tr><tr><td> C3 </td><td> - </td><td> - < /td><td> - </td><td> - </td><td> 8 </td><td> 6 </td><td> - </td><td> - </td ><td> - </td><td> - </td></tr><tr><td> C4 </td><td> 43 </td><td> 47 </td><td > 45 </td><td> 50 </td><td> 40 </td><td> 40 </td><td> 40 </td><td> 40 </td><td> 50 </td><td> 50 </td></tr><tr><td> filler </td><td> D1 </td><td> 6 </td><td> 8 </ Td><td> 19 </td><td> 12 </td><td> 12 </td><td> 12 </td><td> 7 </td><td> 7 </td> <td> 12 </td><td> 12 </td></tr><tr><td> D2 </td><td> - </td><td> 8 </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - </td><td> - < /td><td> - </td></tr><tr><td> Evaluation Project</td><td> Adhesion</td><td> ○ </td><td> ○ < /td><td> ○ </td><td> ○ </td><td> ○ </td><td> ○ </td>< Td> ○ </td><td> ○ </td><td> ○ </td><td> ╳ </td></tr><tr><td> Closeness stability</td>< Td> △ </td><td> △ </td><td> ○ </td><td> ○ </td><td> ○ </td><td> ○ </td><td> ○ </td><td> △ </td><td> ╳ </td><td> ╳ </td></tr></TBODY></TABLE>A1: (Methyl group of Synthesis Example A1) Acrylate-based resin A2: (meth) acrylate-based resin A3 of Synthesis Example A2: (meth) acrylate-based resin A4 of Synthesis Example A3: (meth) acrylate-based resin A5 of Synthesis Example A4: Synthesis (Meth) acrylate type resin A6: (meth) acrylate type resin A7 of Synthesis Example A6: (meth) acrylate type resin B1 of Synthesis Example A7: Hexamethoxymethyl melamine (Hexamethoxymethyl melamine) B2: Hexaethoxymethyl melamine B3: Hexabutoxymethyl melamine B4: Pentamethoxymethyl melamine C1: Diethylene glycol dimethyl ether (Diethylene glycol dimethyl ether) C2: Propylene glycol monomethyl ether C3: 3-ethoxypropionic acid Ethyl 3-ethoxypropionate C4: Cyclohexanone D1: Polymethyl methacrylate bridge resin particles (Model: GS-0407, average particle size: 4 μm, manufactured by GANZ) D2: cerium oxide particles (model : SP-1702, average particle size: 4 μm, manufactured by Rhodia)       

As is clear from Table 2, the ink compositions for pattern formation formed by the (meth)acrylate resins of Synthesis Examples A6 and A7 (Comparative Examples 1 and 2) were synthesized by the synthesis examples A1 to A5 (methyl group). The ink composition for pattern formation formed by the acrylate resin (Examples 1 to 8) has better adhesion and adhesion stability. In other words, Comparative Examples 1 and 2 which do not contain the ethylenically unsaturated monomer (a1) represented by the formula (1) contain the ethylenically unsaturated monomer (a1) represented by the formula (1). Examples 1 to 8 have better adhesion and adhesion stability.

Further, the ink composition for pattern formation of Examples 3 to 7 had better adhesion stability than the ink composition for pattern formation of Example 8. The content of the (meth) acrylate-based resin (A) in Examples 3 to 7 is from 24 parts by weight to 32 parts by weight, and the content of the (meth) acrylate-based resin (A) in Example 8 is contained. It is 35 parts by weight. Therefore, it is understood that when the content of the (meth) acrylate-based resin (A) in the ink composition for pattern formation is from 24 parts by weight to 32 parts by weight, it has better adhesion stability.

Further, as is clear from Table 2, the ink compositions for pattern formation formed by the (meth)acrylate resins of Synthesis Examples A1 and A2 (Examples 1 and 2) were synthesized by Synthesis Examples A3 to A5. The pattern forming ink composition (Examples 3 to 7) formed of the (meth) acrylate-based resin has better adhesion stability. In the synthesis examples A1 and A2, the monomer unit of the ethylenically unsaturated monomer (a1) represented by the formula (1) is 33.25% by weight and 28.00% by weight, and the first hydroxyl group-containing ethylenically unsaturated monomer. The monomer unit of (a2) is 1.25 wt% and 5.00 wt%; however, in Synthesis Examples A3, A4, and A5, the monomer unit of the ethylenically unsaturated monomer (a1) represented by the formula (1) is 24.50% by weight, 8.75% by weight and 3.5% by weight, and the monomer unit of the first hydroxyl group-containing ethylenically unsaturated monomer (a2) was 7.50% by weight, 18.75% by weight and 22.50% by weight. Therefore, it is understood that the monomer unit of the ethylenically unsaturated monomer (a1) represented by the formula (1) in the ink composition for pattern formation is from 3% by weight to 25% by weight, and the first hydroxyl group-containing ethyl group When the monomer unit of the unsaturated monomer (a2) is from 7% by weight to 23% by weight, it has better adhesion stability.

Referring to Fig. 1, there is shown a cross-sectional exploded view of a liquid crystal display device to which an ink composition for pattern formation according to an embodiment of the present invention is applied. In the present embodiment, the liquid crystal display element 100 includes at least the light emitting unit 120 and the liquid crystal panel 150.

In the embodiment, the light emitting unit 120 includes a light source 131 and a light guide plate 110 disposed on one side of the light source 131. The light guide plate 110 includes, for example, a light exit surface 113, a bottom surface 115 with respect to the light exit surface 113, and a light incident surface 111. The light incident surface 111 is formed on one side of the light guide plate 110 and is connected between the light exit surface 113 and the bottom surface 115 such that the bottom surface 115 and the light incident surface 111 form an oblique angle. In this way, the light guide plate 110 is formed with a decreasing thickness from one end of the light incident surface 111 to the opposite end, so that the light is uniformly emitted from the light exit surface 113. In this embodiment, the light guide plate 110 may be a flat plate in addition to the wedge plate described above.

In the embodiment, the bottom surface 115 of the light guide plate 110 has a reflective pattern 117. The reflective pattern 117 can scatter and reflect light incident on the light guide plate 110 through the light incident surface 111, that is, uniformly diffuse the light into various directions. The reflection pattern 117 is formed of the above-described ink composition for pattern formation, and its formation method is, for example, a halftone printing method. In the present embodiment, the reflective pattern 117 may have various shapes such as a circle, a quadrangle or a hexagon, and the reflective pattern 117 may have various arrangements or sizes.

The light incident surface 111 of the light guide plate 110 is opposite to the light source 131, and the light emitted from the light source 131 (not shown) enters the light guide plate 110 through the light incident surface 111, and the light provided by the light source 131 is guided by the light guide plate 110. Lead to the liquid crystal panel 150. The light source 131 includes, for example, a light source 133 and a bulb reflector 135. The light source 133 can be a light source diode of a point source type or a light source type of a light source. The lamp reflector 135 has a single direction opening, so that the light emitted by the light source 133 is reflected directly or by the lamp reflector 135. The light guide plate 110 is entered through the opening of the bulb reflector 135 and the light incident surface 111.

In the embodiment, the light emitting unit 120 further includes an optical group 140. The optical group 140 may include a plurality of optical elements such as a reflective sheet 141, a diffusion sheet 143, and a cymbal 145. The reflective sheet 141 is disposed adjacent to the bottom surface 115 of the light guide plate 110 such that the bottom surface 115 is located between the reflective sheet 141 and the light guide plate 110, thereby reflecting the light that is emitted from the light guide plate 110 through the bottom surface 115 back to the bottom surface 115 and entering the light guide plate. 110. The diffusion sheet 143 is disposed adjacent to the light-emitting surface 113 of the light guide plate 110 such that the light guide plate 110 is positioned between the reflection sheet 141 and the diffusion sheet 143, whereby light emitted through the light guide plate 110 and passing through the light-emitting surface 113 can be uniformly diffused. The cymbal sheet 145 is disposed adjacent to the diffusion sheet 143 such that the diffusion sheet 143 is disposed before the cymbal sheet 145 and the light guide plate 110 for enhancing the front luminance of the light projected onto the liquid crystal panel 150.

Please refer to FIG. 2, which is a perspective exploded view of a liquid crystal display device according to an embodiment of the present invention. In the present embodiment, the liquid crystal display element 200 includes at least the light emitting unit 210, the liquid crystal panel 220, the top chassis 230, and the bottom chassis 240. The illumination unit 210 can be referred to the previous embodiment, and details are not described herein.

The liquid crystal panel 220 may include a thin film transistor substrate 221, a color filter substrate 223, and a liquid crystal layer (not shown), thereby displaying an external image.

Moreover, in the embodiment, the liquid crystal panel 220 further includes a printed circuit board 225 and a tape carrier package 227. The printed circuit board 225 is provided with a drive wafer (not shown) that is coupled to the thin film transistor substrate 221 through a tape carrier package 227. The various signals required for displaying the external image can be transmitted to the thin film transistor substrate 221 by the printed circuit board 225 and the driving wafer.

In the present embodiment, the top chassis 230 can be coupled to the bottom chassis 240. The upper portion of the bottom chassis 240 forms an open storage space. The portion of the bottom chassis 240 around the storage space can support the liquid crystal panel 220, and the storage space can accommodate the light emitting unit 210.

In particular, although the foregoing is to apply the light guide plate of the present invention to the light-emitting unit and the liquid crystal display element having the structure described in FIG. 1 and FIG. 2, the present invention is not limited thereto, that is, The light guide plate of the present invention can also be applied to a light-emitting unit and a liquid crystal display element having other configurations.

As described above, the ink composition for pattern formation of the present invention includes a (meth) acrylate resin. Among them, the (meth) acrylate-based resin includes a monomer unit of an ethylenically unsaturated monomer represented by the formula (1) and a monomer unit of a hydroxyl group-containing ethylenically unsaturated monomer in a specific composition ratio. As described above, the reflection pattern formed by using the ink composition for pattern formation described above has both good adhesion and adhesion stability to the glass substrate. Therefore, the light guide plate, the light-emitting unit, and the liquid crystal display element which are formed using the above-described reflective pattern have preferable optical characteristics.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Liquid display components

110‧‧‧Light guide plate

111‧‧‧Into the glossy surface

113‧‧‧Glossy

115‧‧‧ bottom

117‧‧‧Reflective pattern

120‧‧‧Lighting unit

131‧‧‧Light source

133‧‧‧Light source

135‧‧‧reflector

140‧‧‧Optics

141‧‧‧reflector

143‧‧‧Diffuser

145‧‧‧ Picture

150‧‧‧LCD panel

200‧‧‧Liquid display components

210‧‧‧Lighting unit

220‧‧‧LCD panel

221‧‧‧Film Optoelectronic Substrate

223‧‧‧Color filter substrate

225‧‧‧Printed circuit board

227‧‧‧Reel tape bearing package

230‧‧‧Top chassis

240‧‧‧ bottom chassis

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional, exploded view of a liquid crystal display device according to an embodiment of the present invention. 2 is a perspective exploded view of a liquid crystal display element according to an embodiment of the present invention.

100‧‧‧Liquid display components

110‧‧‧Light guide plate

111‧‧‧Into the glossy surface

113‧‧‧Glossy

115‧‧‧ bottom

117‧‧‧Reflective pattern

120‧‧‧Lighting unit

131‧‧‧Light source

133‧‧‧Light source

135‧‧‧reflector

140‧‧‧Optics

141‧‧‧reflector

143‧‧‧Diffuser

145‧‧‧ Picture

150‧‧‧LCD panel

Claims (11)

An ink composition for pattern formation comprising: a (meth) acrylate resin (A); a melamine bridging agent (B); a solvent (C); and a filler (D); wherein the (meth) The acrylate-based resin (A) includes a monomer unit of the ethylenically unsaturated monomer (a1) represented by the formula (1), a monomer unit of the first hydroxyl group-containing ethylenically unsaturated monomer (a2), and a total of The monomer unit of the monomer (a3) is 100% by weight based on the total monomer unit of the (meth) acrylate resin (A), and the ethylenic unsaturated monomer represented by the formula (1) The monomer unit of the body (a1) is from 3% by weight to 34% by weight, the monomer unit of the first hydroxyl group-containing ethylenically unsaturated monomer (a2) is from 1% by weight to 23% by weight, and the The monomer unit of the copolymerized monomer (a3) is from 60% by weight to 75% by weight: In the formula (1), X represents a residual group of a diacid or an acid anhydride, and Y represents a residual group of a second hydroxyl group-containing ethylenically unsaturated monomer. The ink composition for pattern forming according to claim 1, wherein the diacid or acid anhydride is selected from the group consisting of succinic acid, succinic anhydride, maleic acid, maleic anhydride, phthalic acid, orthophthalic acid. At least one of the group consisting of dicarboxylic anhydride, hexahydrophthalic acid, and hexahydrophthalic anhydride. The ink composition for pattern formation according to claim 1, wherein the second hydroxyl group-containing ethylenically unsaturated single system is selected from the group consisting of 2-hydroxyethyl (meth)acrylate and (meth)acrylic acid. At least a group consisting of 2-hydroxypropyl ester, 4-hydroxybutyl (meth)acrylate, glycerol mono(meth)acrylate, 4-hydroxyvinylbenzene, and 1-ethynyl-1-cyclohexanol One. The ink composition for pattern formation according to claim 1, wherein the first hydroxyl group-containing ethylenically unsaturated monomer (a2) is selected from 2-hydroxyethyl (meth)acrylate, (A) Group of 2-hydroxypropyl acrylate, 4-hydroxybutyl (meth) acrylate, mono(meth) acrylate, 4-hydroxyvinyl benzene, and 1-ethynyl-1-cyclohexanol At least one of the groups. The ink composition for pattern forming according to claim 1, wherein the melamine-based bridging agent (B) is at least selected from the group consisting of alkoxymethylated melamine and methylolated melamine. One. The ink composition for pattern formation according to claim 1, wherein the melamine-based bridging agent (B) is selected from the group consisting of hexamethoxymethyl melamine, hexaethoxymethyl melamine, and hexabutoxy At least one of the group consisting of melamine, pentamethoxymethyl melamine, tetramethoxymethyl melamine, and hexamethylol melamine. The ink composition for pattern formation according to claim 1, wherein all the monomer units based on the (meth) acrylate resin (A) are 100% by weight, represented by the formula (1) The monomer unit of the ethylenically unsaturated monomer (a1) is from 3% by weight to 29% by weight, and the monomer of the first hydroxyl group-containing ethylenically unsaturated monomer (a2) The unit is from 6% by weight to 23% by weight, and the monomer unit of the copolymerizable monomer (a3) is from 60% by weight to 75% by weight. The ink composition for pattern formation according to claim 1, wherein the (meth)acrylate resin (A) is 15 parts by weight based on 100 parts by weight of the pattern forming ink composition. The content of the melamine-based bridging agent (B) is from 5 parts by weight to 20 parts by weight, the solvent (C) is from 40 parts by weight to 60 parts by weight, and the filler (D) The content is from 5 parts by weight to 20 parts by weight. A light guide plate comprising: a light exit surface; a bottom surface opposite to the light exit surface and having a reflective pattern; and a light incident surface coupled between the light exit surface and the bottom surface, wherein the reflective pattern The ink composition for pattern formation according to any one of claims 1 to 8, wherein the ink composition for pattern formation is obtained. A light-emitting unit comprising: a light-emitting source; and a light guide plate according to claim 9 of the invention, disposed on one side of the light-emitting source. A liquid crystal display element comprising: a liquid crystal panel; and a light emitting unit according to claim 10, which is disposed on one side of the liquid crystal panel.