KR101282991B1 - A light diffusion painting composition - Google Patents

Abstract

The present invention relates to a coating composition for light-diffusion films used in liquid crystal displays such as televisions, computer monitors, and more particularly, copolymerizing an acrylate monomer mixture including an acrylate monomer having an acrylic reactive organic-inorganic hybrid and a hydroxy reactor. The present invention relates to a hybrid acrylic binder and a light-diffusing paint composition, comprising a light-diffusion bead, a dispersant, an isocyanate curing agent, and a solvent.
When the light diffusion coating composition is used as a film or coating material on a substrate, it provides improved brightness and improved mechanical properties, thereby preventing scratches on the surface and having excellent light transmittance. Applicable in various fields.

Description

A light diffusion painting composition with excellent brightness

The present invention relates to a light diffusion coating composition having excellent brightness, and more particularly, by using a binder prepared by copolymerizing an acrylate monomer mixture including an acrylate monomer having an acrylic reactive organic-inorganic hybrid and a hydroxy reactor. The present invention relates to a light diffusing coating composition having excellent luminance capable of producing a light diffusing film having excellent optical properties such as total light transmittance and mechanical properties such as adhesion and scratch resistance.

Among various display devices, since the liquid crystal itself is a non-light emitting material, a separate light emitting device called a back light is required to obtain a clear image.

The liquid crystal display method is an indirect illumination method that displays an image through the light guide plate by reflecting light emitted from the fluorescent lamp of the backlight to the white plate, so that the image is not easily seen. Therefore, the light generated from the fluorescent lamp of the backlight is generated. A light diffusion film that can increase the brightness (luminance) of an image by uniformly diffusing is used.

As the light diffusing film, a light diffusing film prepared by coating organic or inorganic light diffusing beads together with a binder resin on one side of a transparent film is generally used. In order to increase the brightness of the film, excellent light transmittance and light diffusing characteristics This is required.

As a conventional method for manufacturing a light diffusing film that requires such characteristics, Korean Unexamined Patent Publication No. 2002-05299, 2001-110179, 2001-05208, Japanese Patent Application Laid-Open No. 6-059108, Japanese Patent Application Laid-Open No. 7 Japanese Patent Application Laid-Open No. 9-127314 discloses a light diffusion film in which a light diffusion layer is formed by coating a composition in which light diffusion beads are dispersed in a binder resin. Japanese Patent Laid-Open No. 9-311205 proposes a method of forming irregularities on the surface of a used sheet by melting and mixing two or more kinds of transparent thermoplastic resins and using a light diffusion film using a difference in refractive index between the resins.

However, when the light diffusing layer is coated on the surface of the conventional method as described above, problems such as peeling of the coating layer due to the difference in thermal expansion properties with the substrate are generated, and light diffusing effect is obtained by the irregularities formed on the surface of the sheet. In the case of the film, there is a problem that the film is more likely to be damaged during the handling process, and the method using the refractive index difference between resins has the advantage of manufacturing the light diffusing film at one time, but until now, sufficient light diffusing characteristics have been achieved. It is a situation that the film which has not been developed.

In particular, with the recent development of display technology, the size of liquid crystal displays is increased and thin products are preferred. Therefore, the light diffusing film applied thereto is required to have the light thickness as thin as possible and excellent light diffusion characteristics and luminance than before.

However, in the case of manufacturing a conventional light diffusing film, for example, the method of adjusting the type, size and use ratio of the light diffusing beads, particle shape, and the like sufficiently satisfy the recently required level of performance. It is difficult.

Accordingly, the present invention has been made to solve the above problems, the light diffusion paint that can exhibit the optical properties such as excellent brightness and total light transmittance required for the light diffusion film, and mechanical properties such as adhesion and scratch resistance It is an object to provide a composition.

In addition, another object of the present invention is to provide a light diffusion film for liquid crystal display having a scratch prevention and excellent light transmittance of the surface by using the light diffusion coating composition described above.

According to an aspect of the present invention,

10 to 250 parts by weight of light diffusion beads, 1 to 5 parts by weight of dispersant, 5 parts by weight of isocyanate curing agent, solvent based on 100 parts by weight of a hybrid acrylic binder resin prepared by copolymerizing a mixture containing an acrylic reactive organic-inorganic hybrid and an acrylate monomer. It is achieved by providing the light-diffusion coating composition excellent in brightness | luminance which contains 50-200 weight part.

In addition, the present invention provides a light-diffusion coating product prepared by applying the light-diffusion coating composition to a surface of a plastic substrate including polycarbonate (PC) or polyethylene terephthalate (PET) at a predetermined thickness and heat curing. Is achieved.

As described above, the light-diffusing paint composition having excellent brightness of the present invention is a film form or coating using a hybrid acrylic binder prepared by copolymerizing an acrylate monomer mixture including an acrylic reactive organic-inorganic hybrid and an acrylate monomer having a hydroxy reactor. When used as a material, by providing improved brightness and improved mechanical properties, it has the effect of preventing scratches on the surface and having excellent light transmittance, which makes it applicable to various fields such as light diffusing film for liquid crystal display, lighting device, and signboard.

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

The coating composition for a light diffusion film of the present invention is 10 to 250 parts by weight of light diffusion beads, dispersant 1 to 5 parts by weight based on 100 parts by weight of a hybrid acrylic binder resin prepared by copolymerizing a mixture containing an acrylic reactive organic-inorganic hybrid and an acrylate monomer. It is characterized by using 5 parts by weight of the isocyanate curing agent, 50 to 200 parts by weight of the solvent.

First, the hybrid acrylic binder is a core component of the present invention 70 to 93.5 parts by weight of one or more selected from the group of acrylate monomers, based on 100 parts by weight of the total binder resin, 2 to 10 acrylate monomers containing a hydroxy group The glass transition temperature produced by polymerizing a mixture of parts by weight, 3 to 10 parts by weight of acrylic reactive hybrid, and 1 to 10 parts by weight of acrylic acid containing carboxyl groups together with an initiator at a reaction temperature of 60 to 110 ° C. for 5 to 9 hours The hybrid acrylic binder which is -10-50 degreeC is used preferably.

The at least one acrylate monomer is methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, isopropyl acrylate, ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, iso It is selected from the group of acrylate monomers, such as propyl methacrylate and butyl methacrylate.

In addition, the acrylate monomer comprising a hydroxy group is selected from the group of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyhexyl acrylate, hydroxyoctyl acrylate and the corresponding methacrylate group.

The acrylate monomer containing such a hydroxyl group is used for the reaction with the isocyanate curing agent when the hybrid acrylic binder forms the light diffusion coating film, and it is preferable to use 2 to 10 parts by weight based on 100 parts by weight of the total binder resin. This is because when the content is less than 2 parts by weight, sufficient curing reaction with the curing agent does not occur, so that the strength of the coating film is weakened. On the contrary, when the content exceeds 10 parts by weight, the flexibility of the coating film is deteriorated. .

In addition, the acrylic reactive organic-inorganic hybrid is a compound represented by the following formula (1), characterized in that the silica nanoparticles, an element or compound containing an unshared electron pair, a compound containing a urethane group, an acrylic group, reactive alkoxy at the end of the isocyanate group The silane compound is synthesized and then reacted with an acrylate compound and prepared by cohydrolysis and condensation reaction with other alkoxysilanes.

In Formula 1,

Y: element or compound containing an unshared electron pair

R1: C1-C12 linear or crushed aliphatic alkyl group, alicyclic alkyl group or aromatic alkyl group

R2: C2-C18 aliphatic alkylene group, C4-C15 alicyclic alkylene group, C6-C15 aromatic alkylene group

R3: Compound having aliphatic, cycloaliphatic or aromatic structure of C1-C20

n is an integer of 1 or more.

In Chemical Formula 1, K represents an inorganic compound having a nano-sized silica network structure prepared by a sol-gel method, and Y may include an element such as N, S, O, or the like including an unshared electron pair. Such compounds include amino groups, sulfide groups, ester groups, ether groups, and the like.

R1 represents a C1-C12 linear or crushed alkyl group, an alicyclic alkyl group or an aromatic alkyl group, and the like, and such compounds include methyl, ethyl, propyl, butyl, hexamethyl, cyclohexyl, phenyl, and dodecanemethyl group.

R <2> is C2-C18 aliphatic alkylene groups, such as butylene, hexamethylene, octamethylene, and dodecane methylene, C4-C15 alicyclic alkylene groups, such as isophorone, cyclohexylene, and isocyanatocyclohexyl, phenyl C6-C15 aromatic alkylene groups, such as ethylene, naphthalene, diphenylmethyl, and toluylene, etc. are mentioned.

R3 is a C1-C20 aliphatic, alicyclic or aromatic structure.

Acrylic reactive organic-inorganic hybrid as shown in Formula 1 is copolymerized with the acrylate monomer serves to contribute to the improvement of brightness and mechanical properties of the light diffusion coating film. The amount of the acrylic reactive hybrid is preferably used in an amount of 3 to 10 parts by weight based on 100 parts by weight of the total binder resin, and when used in an amount less than 3 parts by weight, no improvement in brightness is required. The viscosity of a binder becomes high and the problem that workability falls arises.

In addition, the acrylic acid containing a carboxyl group is selected from acrylic acid, methacrylic acid, crotonic acid, fumaric acid, maleic acid, the acrylic acid serves to improve the transparency in the hybrid acrylic binder polymerization, 1 to 100 parts by weight of the total binder resin It is preferable to use ˜10 parts by weight. This is because when the addition amount is less than 1 part by weight, the transparency of the binder is inferior, and when the amount is more than 10 parts by weight, the viscosity of the binder is increased and adhesiveness is deteriorated.

In addition, as an initiator used for superposition | polymerization, it is selected from peroxide type, such as benzoyl peroxide and isooctyl t-butyl ester peroxide, or azo type, such as azobisisobutyronitrile, and the addition amount is the whole binder resin 100 0.5 to 2 parts by weight is appropriate for the parts by weight. When the addition amount is less than 0.5 parts by weight, the polymerization rate is slow and the conversion rate is low, whereas when it exceeds 2 parts by weight, the reaction rate is fast but the molecular weight of the binder is lowered. This is because the coating film properties decrease.

On the other hand, in the solution polymerization for producing the hybrid acrylic binder, solvents such as aromatic hydrocarbons, acetates, ketones, etc. may be used alone or in combination, and the amount of the solvent is not limited to a direct reaction. Do not.

The hybrid acrylic binder prepared by the above method uniformly disperses the light diffusing particles and prevents the light diffusing particles from falling off the surface after coating, as well as optical properties such as brightness and total light transmittance, adhesion and scratch resistance. It serves to improve the mechanical properties such as sex.

On the other hand, the light diffusing beads and dispersing agent, isocyanate curing agent, solvent added as a component of the coating composition together with the hybrid acrylic binder resin is not particularly limited, all conventionally used in the conventional light diffusing coating composition, but will be described later It is preferable to use the

Light-diffusion beads consist of polymers polymerized with monomers such as methyl methacrylate, ethyl methacrylate, propylene, acrylonitrile, styrene, acrylic acid, methacrylic acid, silica, aluminum oxide, titanium oxide, zirconia, and carbonic acid. It is preferable to use together inorganic particles, such as calcium, 1 type (s) or 2 or more phases.

The light diffusion beads are preferably used in an amount of 10 to 250 parts by weight based on 100 parts by weight of the hybrid acrylic binder resin solids, and when the amount is less than 10 parts by weight, optical properties such as total light transmittance and haze are insufficient. When exceeded, the viscosity of the light-diffusion paint is increased, making it difficult to form a uniform coating film and deteriorating optical properties including total light transmittance.

together. The dispersant is used to uniformly mix the light diffusion beads into the binder, and is selected from an acrylate copolymer, a polyacrylate solution, a modified polymethylalkylsiloxane, a fluoride system, and the like, based on 100 parts by weight of the hybrid acrylic binder resin solids. Use at 1 to 5 parts by weight. If the content of the dispersant is less than 1 part by weight, the dispersing effect is insufficient, and when the content of the dispersant is more than 5 parts by weight, there is a problem that it acts as an impurity to weaken the strength of the coating film.

As a solvent used for mix | blending such a light-diffusion coating composition, it is preferable to use together an aromatic hydrocarbon type, such as toluene and xylene, and a ketone solvent, such as methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone.

Hereinafter, the light-diffusion coating composition of the present invention will be described in more detail with reference to the following examples, but the scope of the present invention is not limited by the following examples.

&Lt; Example 1 >

Production of Acrylic Reactive Hybrid

45 g of isophorone diisocyanate and 70 g of bis (trimethoxysilylpropyl) amine were reacted at a rate of 100 to 200 rpm at a temperature of 100 to 200 rpm in a 1 L flask to prepare a silane compound including an isocyanate group at the end. 30 g of 2-hydroxyethyl methacrylate and 100 g of methyl ethyl ketone were mixed with 115 g of the compound, 0.05 g of dibutyl tin dilaurate was added as a reaction catalyst, and the mixture was stirred for 6 hours in a 60 ° C. oil bath under a nitrogen atmosphere to obtain an acrylic group terminal. Silane compounds were prepared. 400 g of tetramethoxysilane, 125 g of methyltriethoxysilane, 60 g of water, and 2 g of 0.1 N aqueous hydrochloric acid solution were added to the compound and stirred at room temperature for 24 hours to prepare an acrylic reactive organic-inorganic hybrid.

Hybrid acrylic binder manufacturing

In a five-necked separate flask equipped with a stirrer, a cooler and a nitrogen injector, 54 g of methyl methacrylate and 39 g of ethylhexyl acrylate, 5 g of 2-hydroxyethyl methacrylate, 2 g of acrylic acid, prepared in the previous step, as shown in Table 1 below. 15 g of acrylic reactive hybrid (solid content: 30%) and 86 g of methyl ethyl ketone were added thereto, and nitrogen was added at 80 ° C., and the initiator solution in which 0.6 g of benzoylphenoxide was dissolved in 60 g of methyl ethyl ketone was dropped for 2 hours. The polymerization reaction was carried out while measuring the conversion rate every hour. After 6-7 hours of reaction at a stirring speed of 100rpm, the conversion was more than 100% and a hybrid acrylic binder was prepared by confirming that the double bond disappeared from the IR spectrum.

-Light diffusion paint manufacturing

To 100 g of the hybrid acrylic binder (solid content: 40%) synthesized in the previous step as shown in Table 2, 3.2 g of MH-15FD (polymethyl methacrylate light diffusion bead, particle size: 15 μm, Kolon), MH-15FD ( Polymethyl methacrylate light diffusing beads, particle size: 5㎛, Kolon) 4.8g, toluene 40g, methyl ethyl ketone 60g, AFCONA-3030 (dispersant, AFCONA, Japan) 1.5g, DN 980S (isocyanate curing agent, Aekyung Chemical) 5g was added, and the light-diffusing paint prepared by mixing at a speed of 2,000 rpm using a centrifugal mixer for 3 minutes was used as Example 1.

<Example 2>

To prepare a light-diffusion paint in the same manner as in Example 1, the light-diffusion paint prepared as shown in Table 2 using a hybrid acrylic binder polymerized with the acrylic reactive hybrid to 25g as shown in Table 1 to Example 2 It was.

<Example 3>

To prepare a light-diffusion paint in the same manner as in Example 1, 24g of MH-15FD (polymethyl methacrylate light diffusion beads, particle size: 15㎛, Kolon) to 100g of a hybrid acrylic binder prepared as shown in Table 1, Using a 36 g of MH-15FD (polymethyl methacrylate light diffusing beads, particle size: 5㎛, Kolon) to prepare a light-diffusion paint prepared in Table 2 as Example 3.

<Example 4>

To prepare a light-diffusion paint in the same manner as in Example 2, 24g of MH-15FD (polymethyl methacrylate light diffusion beads, particle size: 15㎛, Kolon) to 100g of a hybrid acrylic binder prepared as shown in Table 1, Using a 36 g of MH-15FD (polymethyl methacrylate light diffusing beads, particle size: 5㎛, Kolon), the light-diffusion paint prepared in Table 2 was used as Example 4.

&Lt; Comparative Example 1 &

To prepare a light-diffusing paint in the same manner as in Example 2, using a binder resin polymerized without using an acrylic reactive organic-inorganic hybrid prepared as shown in Table 1 below Comparative Example It was set to 1.

Comparative Example 2

 To prepare a light-diffusion paint in the same manner as in Example 2, 0.8g of MH-15FD (polymethyl methacrylate light diffusion beads, particle size: 15㎛, Kolon) to 100g of a hybrid acrylic binder prepared as shown in Table 1 , 1.2 g of MH-15FD (polymethyl methacrylate light diffusing bead, particle size: 5 μm, Kolon) was used as Comparative Example 2, which was prepared as shown in Table 2 below.

&Lt; Comparative Example 3 &

To prepare a light-diffusing paint in the same manner as in Example 4, using a binder resin polymerized without using an acrylic reactive organic-inorganic hybrid prepared as shown in Table 1 below Comparative Example It was set to three.

&Lt; Comparative Example 4 &

 Prepare a light-diffusion paint in the same manner as in Example 4, 148g of MH-15FD (polymethyl methacrylate light diffusion beads, particle size: 15㎛, Kolon) in 100g of a hybrid acrylic binder as shown in Table 1 below, MH- The light diffusing paint prepared in the following Table 2 was used as Comparative Example 4 using 112 g of 15FD (polymethyl methacrylate light diffusing beads, particle size: 5 μm, Kolon).

Example 1,3 Example 2,4
Comparative Examples 2 and 4 Comparative Examples 1 and 3 Methyl methacrylate (g) 54 54 54 Ethylhexyl acrylate (g) 39 39 39 2-hydroxyethyl
Methacrylate (g) 5 5 5 Acrylic Acid (g) 2 2 2 Acrylic Reactive Hybrid (g)
(Solid content: 30%) 15 25 - Methyl ethyl ketone (g) 146 143 150 Benzoylphenoxide (g) 0.6 0.6 0.6

Top Diffusion Film Lower Diffusion Film Example 1 Example 2 Comparative Example 1 Comparative Example 2 Example 3 Example 4 Comparative Example 3 Comparative Example 4 Hybrid acrylic binder-1 (g) (solid content: 40%) 100 - - - 100 - - - Hybrid acrylic binder-2 (g) (solid content: 40%) - 100 - 100 - 100 - 100 Acrylic binder (g) - - 100 - - - 100 - MH-15FD (g) (Light Diffusion Bead, Particle Size: 15㎛, Kolon) 3.2 3.2 3.2 0.8 24 24 24 148 MH-15FD (g) (Light Diffusion Bead, Particle Size: 5㎛, Kolon) 4.8 4.8 4.8 1.2 36 36 36 112 AFCONA-3030 (g) (AFCONA, Japan) 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 Toluene (g) 40 40 40 40 40 40 40 40 Methyl ethyl ke (g) ton 60 60 60 60 60 60 60 60 DN980S (g) (isocyanate curing agent, Aekyung Chemical) 5 5 5 5 5 5 5 5

<Experimental Example 1>

After coating the light-diffusion paints of Examples 1 to 4 and Comparative Examples 1 to 4 prepared as described above to a PET film with a thickness of 8 μm, the coating film was cured in a hot air circulation oven at 100 ° C. for 1 minute. The characteristics were evaluated by the method, and the results are shown in Table 3 below.

Adhesion

100 gratings of 1 mm in width and length were made on the surface of the cured coating film, and the adhesive force was evaluated by the number of gratings remaining on the substrate when peeled off with a tape (3M, 5413).

Hardness

The surface hardness of the cured coating film was measured using a pencil hardness tester in accordance with JIS K5600. Visually, the degree of the wound on the coated surface was checked and evaluated by a pencil hardness of at least 3 mm. The evaluation was performed three times or more until the same result was obtained.

Scratch resistance

The degree of scratches was visually determined by reciprocating steel wool with a load of 500 g 100 times on the surface of the cured coating film.

 ◎ very good

 ○: excellent

 △: normal

 ×: Poor

Optical properties

The haze and total light transmittance of the cured coating film were evaluated using a spectrophotometer and a haze meter according to JIS K7361-1.

Luminance

The light diffusing film was cut to be mounted on the backlight unit, and then mounted on the light guide plate of the backlight unit (syncmaster monitor, Samsung), and the luminance value of 10 locations was evaluated using a luminance meter (chroma meter CS-100, MINOLTA).

Evaluation item Top Diffusion Film Lower Diffusion Film Example 1 Example 2 Comparative Example 1 Comparative Example 2 Example 3 Example 4 Comparative Example 3 Comparative Example 4 Adhesion (/ 100) 100 100 100 100 100 100 100 80 Total light transmittance (%) 91 93 89 87 98 99 97 74 Haze (%) 50 53 46 30 88 89 86 89 Scratch resistance ○ ◎ △ △ ○ ◎ △ ○ Brightness (cd) 3680 3700 3650 3680 3380 3430 3250 3220 Surface hardness 2H 3H H 2H 2H 3H H 2H

As can be seen from the results of Table 3, using a hybrid acrylic binder resin prepared by copolymerizing a mixture comprising an acrylic reactive organic-inorganic hybrid and an acrylate monomer presented in the present invention as in Examples 3 and 4, 10 to 250 parts by weight of light diffusion beads, 1 to 5 parts by weight of dispersant, 5 parts by weight of isocyanate curing agent, and 50 to 200 parts by weight of solvent based on 100 parts by weight of the binder resin solid content. It can be seen that the overall coating film characteristics are excellent.

On the other hand, in the case of the light diffusion paints of Examples 1 and 2 and Comparative Examples 2 and 4, a hybrid acrylic binder resin was used, but Examples 1 and 2, in which the amount of light diffusion beads added to the binder resin were less than the appropriate range, In Comparative Example 2, the result of the light adequacy characteristic (Haze) is very low. On the contrary, in the case of Comparative Example 4, in which the amount of the light diffusing beads is added in an appropriate range, the total light transmittance is very low.

In addition, in the case of the light diffusing paint prepared using a common acrylic binder as in Comparative Examples 1 and 3, the optical properties are excellent, but the experimental results are very low in mechanical strength such as surface hardness and scratch resistance. You can check it.

As described above, the present invention has been proved excellent in the physical properties through the above embodiments, but the present invention is not necessarily limited only by the above configuration, various substitutions within the scope not departing from the technical idea of the present invention, Modifications and variations are possible.

Claims (8)

In the light-diffusion coating composition,
10 to 250 parts by weight of light diffusion beads, 1 to 5 parts by weight of dispersant, 5 parts by weight of isocyanate curing agent, solvent based on 100 parts by weight of a hybrid acrylic binder resin prepared by copolymerizing a mixture containing an acrylic reactive organic-inorganic hybrid and an acrylate monomer. Light-diffusion coating composition excellent in brightness, characterized in that it comprises 50 to 200 parts by weight.
The method according to claim 1, wherein the hybrid acrylic binder is 70 to 93.5 parts by weight of one or more selected from the group of acrylate monomers, 2 to 10 parts by weight of one acrylate monomer containing a hydroxy group with respect to 100 parts by weight of the total binder resin, 3-10 parts by weight of the acrylic reactive hybrid, a mixture of 1-10 parts by weight of acrylic acid containing a carboxyl group was prepared by polymerization with an initiator at a reaction temperature of 60-110 ° C. for 5-9 hours. Light-diffusion coating composition excellent in the brightness | luminance.
The light diffusing coating composition of claim 2, wherein the acrylic reactive organic-inorganic hybrid is a compound represented by the following Chemical Formula 1.
&Lt; Formula 1 >

In Chemical Formula 1,
Y: element or compound containing an unshared electron pair
R1: C1-C12 linear or crushed aliphatic alkyl group, alicyclic alkyl group or aromatic alkyl group
R2: C2-C18 aliphatic alkylene group, C4-C15 alicyclic alkylene group, C6-C15 aromatic alkylene group
R3: Compound having aliphatic, cycloaliphatic or aromatic structure of C1-C20
n is an integer of 1 or more.
The method of claim 2, wherein the acrylate monomer is methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, isopropyl acrylate, ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate Light diffusion coating composition excellent in brightness, characterized in that selected from isopropyl methacrylate, butyl methacrylate.
The acrylate monomer of claim 2, wherein the acrylate monomer comprising a hydroxy group is selected from the group consisting of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyhexyl acrylate, hydroxyoctyl acrylate and the corresponding methacrylate group. Excellent light-diffusion coating composition, characterized in that selected from.
The light diffusing coating composition of claim 2, wherein the acrylic acid including the carboxyl group is selected from acrylic acid, methacrylic acid, crotonic acid, fumaric acid, and maleic acid.
The method according to claim 6, wherein the initiator is selected from a peroxide-based, such as benzoyl peroxide, isooctyl t-butyl ester peroxide, or azo-based, such as azobisisobutyronitrile, the addition amount of the total binder resin 100 0.5-2 weight part with respect to a weight part, The excellent light-diffusion coating composition characterized by the above-mentioned.
The light-diffusion coating, characterized in that the light diffusion coating composition of any one selected from claims 1 to 7 is produced by applying a predetermined thickness to the surface of the plastic substrate including a polycarbonate (PC) or polyethylene terephthalate (PET) and heat-curing product.