KR101827053B1 - Light diffusion particle and light diffusion sheet comprising the same - Google Patents

Abstract

상기 화학식 2에서, R₁ 및 R₂는 각각 독립적으로 탄소수 1 내지 5의 알킬기이고, R₃ 및 R₄는 각각 독립적으로 탄소수 2 내지 15의 알킬렌기이고, A₁ 및 A₂는 각각 독립적으로 글리시독시기 또는 에폭시기이며, n의 평균 값은 10 내지 50이다.The light-diffusing particle of the present invention is a polymer of a polyorganosilsesquioxane having a repeating unit represented by the following formula (1) and a siloxane compound represented by the following formula (2), wherein the polyorganosilsesquioxane and the siloxane compound Is in the range of 3: 1 to 30: 1. The light-diffusing particles have a lower refractive index than the polyisocyanurate siloxane particles, and can realize excellent light diffusing properties, brightness, and the like.
[Chemical Formula 1]
RSiO _1.5-x (OH) _x
Wherein R is an alkyl group having 1 to 6 carbon atoms, a vinyl group or an aryl group, x is 0 or more and less than 1.5;
(2)

Wherein R ₁ and R ₂ are each independently an alkyl group having 1 to 5 carbon atoms, R ₃ and R ₄ are each independently an alkylene group having 2 to 15 carbon atoms, A ₁ and A ₂ are each independently a gly An epoxy group, and an average value of n is 10 to 50. [

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a light diffusing particle,

The present invention relates to a light diffusion particle and a light diffusion plate comprising the same. More specifically, the present invention relates to a silicon-based light-diffusing particle, a method of manufacturing the same, and a light diffusion plate including the same.

Silica-based particles such as silica and polyorganosiloxanesquioxane are generally excellent in compatibility with various polymer resins and organic materials, and can be used as additives for paints, plastics, rubbers, paper, coating liquids, and activators for improving the running stability of high- And is widely used.

In particular, the polyorganosilsesquioxane particles have a molecular structure of a three-dimensional network structure and are excellent in compatibility with a resin, so that the resin composition containing the same has excellent fluidity and exhibits properties such as optically low refractive index. Therefore, a molded article containing such polio-nosilsesquioxane particles is spotlighted as an illumination cover, a signboard, a liquid crystal display device backlight, a diffuser for a light diffusion plate (film), an additive for a light guide plate, and the like.

Such polyorganosilsesquioxane particles can be produced by a sol-gel method using hydrolysis and condensation reaction mechanisms using organoalkoxysilane monomers such as methyltrialkoxysilane monomers as disclosed in Japanese Patent Application Laid-Open No. 2000-186148 Lt; / RTI >

The silicon-based particles can realize a light diffusion effect by controlling the refractive index difference with respect to the matrix resin and the particle size. For example, the silicone-based particles can be used as a light diffusing agent, Can be used.

In recent years, soft type silicon-based particles such as polydimethylsiloxane have been used in order to further improve the light diffusion effect (light diffusing property), and studies have been made to reduce the particle size of the particles to the maximum, or to lower the refractive index. However, soft type silicon-based particles are subject to many restrictions such as polymerization raw materials, polymerization reactivity, and morphology (implementation of spherical particles) in order to polymerize particles having small particle diameters, and there is a possibility that individual particles are clustered.

Therefore, there is a need to develop light-diffusing particles capable of realizing low refractive index, excellent light diffusing property, and brightness without such a problem.

Disclosure of the Invention [0007] The object of the present invention is to provide a light-diffusing particle having a lower refractive index and superior light diffusing properties, brightness and the like as compared to polyisocyanosilsesquioxane particles, and a method for producing the same.

Another object of the present invention is to provide a light diffusion plate including the light diffusion particles and having excellent light diffusibility and brightness.

The above and other objects of the present invention can be achieved by the present invention described below.

One aspect of the invention relates to light diffusing particles. Wherein the light-diffusing particles are a polymer of a polyorganosiloxane and a siloxane compound represented by the following formula (2), wherein the weight ratio of the polyorganosilsesquioxane and the siloxane compound is 3 : 1 to 30: 1.

[Chemical Formula 1]

RSiO _{1 .5- x} (OH) _x

Wherein R is an alkyl group having 1 to 6 carbon atoms, a vinyl group or an aryl group, x is 0 or more and less than 1.5;

(2)

Wherein R ₁ and R ₂ are each independently an alkyl group having 1 to 5 carbon atoms, R ₃ and R ₄ are each independently an alkylene group having 2 to 15 carbon atoms, A ₁ and A ₂ are each independently a gly An epoxy group, and an average value of n is 10 to 50. [

In an embodiment, the polyorganosilsesquioxane may be particles having an average particle size (D50) of 0.1 to 10 [mu] m.

In an embodiment, the siloxane compound may include at least one compound represented by the following formula (2a) and a compound represented by the following formula (2b):

(2a)

(2b)

In Formulas (2a) and (2b), the average value of n is as defined in Formula (2).

In an embodiment, the refractive index of the light diffusing particles may be 1.40 to 1.428.

In an embodiment, the light-diffusing particles may have an average particle diameter (D50) of 0.1 to 10 mu m.

Another aspect of the present invention relates to a method for producing the light-diffusing particles. Wherein the polyorganosilsesquioxane and the siloxane compound are in a weight ratio of 3: 1 to 30: 1, wherein the weight ratio of the polyorganosilsesquioxane to the siloxane compound is from 3: 1 to 30: 1 .

In an embodiment, the polymerization can be carried out by a sol-gel method.

In an embodiment, the polyorganosilsesquioxane may be prepared by polymerizing an organotrialkoxysilane by a sol-gel method.

In an embodiment, the organotrialkoxysilane may comprise at least one of methyltrimethoxysilane, methyltriethoxysilane, and methyltripropoxysilane.

Another aspect of the present invention relates to a light diffusing plate. Wherein the optical diffusion plate comprises a thermoplastic resin and the light diffusion particles.

In an embodiment, the refractive index of the thermoplastic resin may be 1.47 to 1.60.

In an embodiment, the light diffusing plate may include 0.01 to 20 parts by weight of the light diffusion particles with respect to 100 parts by weight of the thermoplastic resin.

In an embodiment, the refractive index difference between the thermoplastic resin and the light-diffusing particle may be 0.01 to 0.17.

In an embodiment, the light diffusing plate has a light transmittance of 57% and a light transmittance of 1.5 mm, and the amount of light diffusing particles is reduced by 5% or more compared to that of the polyosiloxane sesquioxane. May be at least 1,050 cd / m ² .

DISCLOSURE OF THE INVENTION The present invention has an effect of providing a light diffusing particle having a low refractive index, capable of realizing excellent light diffusing property, brightness and the like, a method for producing the same, and a light diffusing plate including the light diffusing particle, .

Hereinafter, the present invention will be described in detail.

The light-diffusing particle according to the present invention is a polymer of a siloxane compound having a low refractive index, excellent light diffusibility, brightness, etc., wherein the polyol includes noxylsquesquioxane and a terminal epoxy group.

According to one embodiment of the present invention, the polyoxyalkoxysquioxane may include a repeating unit represented by the following formula (1).

[Chemical Formula 1]

RSiO _{1 .5- x} (OH) _x

In the above formula (1), R is an alkyl group having 1 to 6 carbon atoms, a vinyl group or an aryl group, and x is 0 or more and less than 1.5. For example, R may be a methyl group, an ethyl group, a phenyl group or the like, and specifically, a methyl group or the like.

In embodiments, the polyorganosilsesquioxane may be prepared by sol-gel method (hydrolysis and condensation reaction) using a monomer comprising organotrialkoxysilane, but is not limited thereto.

In embodiments, the polyorganosilsesquioxane may be selected from the group consisting of a random structure of Formula 1a, a ladder structure of Formula 1b, a cage structure of Formula 1c, a partial cage of Formula 1d, cage structure and the like.

[Formula 1a]

[Chemical Formula 1b]

[Chemical Formula 1c]

≪ RTI ID = 0.0 &

In the above formulas (1a), (1b), (1c) and (1d), R is as defined in the above formula (1).

In embodiments, the polyoxyalkoxysquioxane may be particles having an average particle size (D50) as measured by a laser scattering particle size analysis of from 0.1 to 10 microns, such as from 1 to 5 microns. The light diffusing property of the light diffusion particles can be excellent in the above range.

The siloxane compound according to one embodiment of the present invention includes a terminal epoxy group and may be represented by the following formula (2).

(2)

In the general formula (2), R ₁ and R ₂ each independently represent an alkyl group having 1 to 5 carbon atoms, such as a methyl group, an ethyl group, a propyl group, a butyl group and the like, and specifically a methyl group. R ₃ and R ₄ each independently represent an alkylene group having 2 to 15 carbon atoms, for example, an ethylene group, a propylene group, a butylene group, a pentylene group, a hexylene group and the like. A ₁ and A ₂ each independently may be a glycidoxy group or an epoxy group. The average value of n may be from 10 to 50, for example from 20 to 40.

In an embodiment, the siloxane compound may include a compound represented by the following formula (2a), a compound represented by the following formula (2b), combinations thereof, and the like.

(2a)

(2b)

In Formulas (2a) and (2b), the average value of n is as defined in Formula (2).

In a specific example, the siloxane compound can be prepared by reacting a siloxane compound (precursor) represented by the following formula (3) with a compound represented by the following formula (4) (functional group).

(3)

In Formula 3, R ₁ , R _2, and n are the same as defined in Formula 2.

The siloxane compound of Formula 2 may be prepared by reacting a linear siloxane of which n is 0 with a cyclic siloxane or the like, but is not limited thereto.

[Chemical Formula 4]

In the formula (4), A ₃ may be a glycidoxy group or an epoxy group, and R ₅ may be a hydrocarbon group having 2 to 15 carbon atoms, for example, a vinyl group (CH ₂ ═CH-), an allyl group CH ₂ = CH-CH ₂ -), and the like.

Herein, as the compound represented by the general formula (4), two or more compounds in which A ₃ and R ₅ are different from each other may be used. After the reaction, A ₃ and R ₅ each represent A ₁ and A ₂ And R < ₃ > and R < ₄ >.

In embodiments, the reaction may be carried out in the presence of a catalyst. As the catalyst, a catalyst containing platinum may be used. For example, the catalyst may be a platinum element itself or a compound containing platinum, and specifically, H ₂ PtCl ₆ , Pt ₂ {[(CH ₂ ═CH) Me ₂ Si] ₂ O} ₃ , Rh [ (cod) ₂ ] BF ₄ , Rh (PPh ₃ ) ₄ Cl, Pt / C, or the like, alone or in combination. More specifically, Pt / C, for example, 10% Pt / C can be used. The amount of the catalyst to be used may be, for example, 10 to 500 ppm, for example, 50 to 150 ppm with respect to the whole reactant. The reaction may be carried out in an organic solvent, and examples of the organic solvent include 1,2-dichloroethane, toluene, xylene, dichlorobenzene, a mixed solvent thereof, and the like, but the present invention is not limited thereto. For example, in toluene. In addition, the reaction can control the reaction temperature and the reaction time depending on the reactivity of the reactants (Formula 3 and Formula 4). For example, the reaction can be carried out at a reaction temperature of 60 to 140 ° C, specifically 110 to 120 ° C, for 2 to 12 hours, for example 3 to 5 hours, but is not limited thereto.

The light diffusing particles of the present invention can be obtained by mixing the polyorganosilsesquioxane and the siloxane compound in a weight ratio (polyorganosilsesquioxane: siloxane compound) of 3: 1 to 30: 1, such as 4: 1 to 20: . When the weight ratio is less than 3: 1, there is a disadvantage that processing molding is not easy. When the weight ratio is more than 30: 1, the refractive index reduction effect of the light diffusing particles and the optical diffusing property, There is a fear that the effect may not be obtained.

In a specific example, the light-diffusing particles may have a crosslinked structure in which a polyorganosilsesquioxane unit having a three-dimensional structure is introduced into a linear structure derived from the siloxane compound.

In an embodiment, the light-diffusing particles may have an average particle size (D50) of 0.1 to 10 μm, for example, 1 to 5 μm, as measured by a laser scattering particle size analysis method. In the above range, the light diffusion efficiency is excellent, and the possibility of production and easy processing of the resin are advantageous.

In an embodiment, the light-diffusing particles may be spherical particles. In the present invention, "spherical particles" means "particles having a substantially spherical shape ", and may include, for example, spheres having an ellipse or irregular shape. The spherical particles may have a ratio of long diameter to short diameter (long diameter / short diameter) of 1.0 to 1.5.

In an embodiment, the light-diffusing particles may have a refractive index of 1.40 to 1.428, for example 1.405 to 1.427. In the above range, scattering of light at the interface between the matrix resin (thermoplastic resin) of the light diffusion plate and the light diffusion particles can be increased and the light diffusion effect can be improved.

The light-diffusing particles according to one embodiment of the present invention can be produced through a manufacturing method comprising the step of polymerizing the polyorganosilsesquioxane and the siloxane compound in the weight ratio.

In an embodiment, the polymerization can be carried out by a sol-gel method. The sol-gel method (hydrolysis and condensation reaction) is well known to those skilled in the art. Specifically, the hydrolysis and condensation reaction may be carried out by mixing the reactant with a predetermined solvent, and may further include a catalyst for controlling the reaction rate. The catalyst may be an acid catalyst such as hydrochloric acid, acetic acid, hydrogen fluoride, nitric acid, sulfuric acid, chlorosulfonic acid, or iodic acid; Basic catalysts such as ammonia, potassium hydroxide, sodium hydroxide, barium hydroxide and imidazole; Amberite IRA-400, IRA-67, and the like can be used. More specifically, it can be carried out at a pH of 2 to 10, for example, at a pH of 4 to 8. In the above range, light diffusing particles containing a polymer of a polyoxyalkanoic siloxane and a siloxane compound in the form of a latex can be obtained. The hydrolysis and condensation reaction may be performed at room temperature for 3 hours to 7 days, and may be performed at 60 to 100 ° C for 2 to 72 hours to promote the reaction, but the present invention is not limited thereto. In the hydrolysis and condensation reaction, the solvent is not particularly limited, and examples thereof include toluene, methanol, ethanol, propanol, isopropanol, n-butanol, tert-butanol, methoxypropanol, have.

In one embodiment, a dehydration process of the light-diffusing particles may be performed to obtain the powdered light-diffusing particles. In the dewatering process, the primary dewatered sludge is purified through a washing process using a centrifugal separator, a filter press, a vibrating screen, and the like, and then the product is spin-dried in the range of 80 to 250 ° C. , A spray drier, a vacuum drier, or the like to produce light diffusing particles in the form of a white powder (spherical particle). The powdered light-diffusing particles may have a water content of 5 wt% or less, for example, 3 to 5 wt%.

In one embodiment, further drying (secondary drying or sintering) may be performed to further lower the moisture content of the powdered light diffusing particles. The drying or sintering may be performed at a temperature of 200 to 400 ° C, for example, 250 to 350 ° C for 30 minutes to 3 hours, for example, for 1 to 3 hours, but is not limited thereto.

In an embodiment, the polyorganosilsesquioxane may be prepared by polymerizing an organotrialkoxysilane by a sol-gel method. For example, as the organotrialkoxysilane, methyltrimethoxysilane (MTMS), methyltriethoxysilane, methyltripropoxysilane, combinations thereof, and the like can be used, but the present invention is not limited thereto. The use of methyltrimethoxysilane (MTMS) may be advantageous in terms of flowability, degradability and economics in the process.

Specifically, hydrolysis and condensation reactions can be carried out by mixing the reactant (organotrialkoxysilane) with the solvent at the time of preparing the polyorganosilsesquioxane, and further include the catalyst for controlling the reaction rate It is possible. More specifically, the hydrolysis and condensation reaction can be carried out in the presence of a base catalyst at a pH of from 8.5 to 13, for example, from pH 10 to 13. In the above-mentioned range, the latex-type polyoxyalkoxysquioxane can be obtained. The hydrolysis and condensation reaction may be performed at room temperature for 3 hours to 7 days, and may be performed at 60 to 100 ° C for 2 to 72 hours to promote the reaction, but the present invention is not limited thereto. In addition, the polyorganosilsesquioxane can also be used after pulverization and moisture removal through the dehydration and drying process.

The optical diffusing plate (film) according to the present invention comprises a thermoplastic resin and the above-mentioned light-diffusing particles, and can obtain excellent light diffusing properties, brightness and the like. The light diffusion plate (film) is particularly useful as a back light unit (BLU) such as an LCD-TV.

In a specific example, the thermoplastic resin may be a vinyl chloride resin, a polystyrene resin, a styrene-acrylonitrile resin, a polyacrylic resin, an acryl-styrene resin, a polyester resin, an ABS resin Resin or polycarbonate resin may be used without limitation.

In an embodiment, the refractive index of the thermoplastic resin may be 1.47 to 1.60, for example, 1.49 to 1.53, and the refractive index difference between the thermoplastic resin and the light-diffusing particle may be 0.01 to 0.17, for example, 0.04 to 0.16. It is possible to obtain a light diffusion plate having excellent luminance and light diffusibility in the above range.

In an embodiment, the light diffusing plate may vary depending on the transmittance degree of the light diffusing plate, but may include 100 parts by weight of the thermoplastic resin and 0.1 to 20 parts by weight, for example, 0.5 to 10 parts by weight of the light diffusing particles.

In an embodiment, the manufacture of the light diffusing plate can be easily carried out by a person having ordinary skill in the art to which the present invention belongs. For example, after the thermoplastic resin and the light-diffusing particles are mixed with other additives as needed, they are melt-extruded in an extruder to produce pellets, which are then subjected to various molding processes such as injection molding, extrusion molding, vacuum molding, (Molded product) by various methods.

In an embodiment, the light diffusing plate may have a light transmittance of 57% or less, based on the 1.5 mm thick specimen, the amount of light diffusing particles added is 5% or more, for example, 7 to 20% less than the polystyrene sesquioxane particles And the brightness of a specimen having a thickness of 1.5 mm may be 1,050 cd / m ² or more, for example 1,051 to 1,070 cd / m ² .

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. However, the following examples are provided to aid understanding of the present invention, and the scope of the present invention is not limited to the following examples. The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.

Example

Example  One: Light diffusion  Manufacturing of particles

400 g of methyltrimethoxysilane was added to 3,200 g of ion-exchanged water and stirred for 30 minutes. Then, the pH was adjusted to 9.6 by adding ammonia water, and the mixture was allowed to stand for 4 hours to prepare a polymethylsilsesquioxane polymer solution (latex) Respectively. This was filtered and washed with water, and then dried with a spray dryer to recover 200 g of white powder (polymethylsilsesquioxane particles, average particle diameter: 2 m).

Subsequently, 200 g of the polymethylsilsesquioxane particle (PMSQ) and 30 g of a siloxane compound (EPDMS) represented by the following formula (2a) (n = 30) were added to 2,000 g of methanol and stirred for 30 minutes. To adjust the pH to 3.5, and the mixture was allowed to stand for 4 hours to prepare a polymerization solution (latex) of polymethylsilsesquioxane and siloxane compound. (Yield: 90%, average particle diameter: 1.9 μm) was obtained by filtration, washing with water, drying with a spray drier, and drying (sintering) at 250 ° C. for 150 minutes.

(2a)

Example  2: Light diffusion  Manufacturing of particles

(Yield: 85%, average particle diameter: 2.0 μm) was prepared in the same manner as in Example 1, except that 50 g of the siloxane compound (EPDMS) represented by Formula 2a (n = 30) .

Comparative Example  One: Light diffusion  Manufacturing of particles

400 g of methyltrimethoxysilane was added to 3,200 g of ion-exchanged water and stirred for 30 minutes. Then, the pH was adjusted to 9.6 by adding ammonia water, and the mixture was allowed to stand for 4 hours to prepare a polymethylsilsesquioxane polymer solution (latex) Respectively. This was filtered and washed with water, dried with a spray dryer, and then dried (sintered) at 250 ° C for 150 minutes to obtain light diffusion particles (polymethylsilsesquioxane particles) in the form of a white powder (yield: 95 %, Average particle diameter: 1.9 mu m).

Property evaluation method

(1) Average particle size (D50) (unit: 占 퐉): Measured by laser scattering particle size analysis method.

(2) Refractive index: The refractive index of a 2.5 mm thick specimen was measured at a temperature of 20 占 폚 by using a refractive index measuring apparatus (apparatus name: DR-A1) manufactured by ATAGO.

Example 1 Example 2 Comparative Example 1 PMSQ (g) 200 200 200 EPDMS (g) 30 50 - PMSQ: EPDMS (weight ratio) 6.7: 1 4: 1 - Light diffusion particle average particle diameter (占 퐉) 1.9 2.0 1.9 Refractive index 1.423 1.419 1.428

Example  4 to 5 and Comparative Example  2

Polystyrene resin (weight average molecular weight: 340,000 g / mol) and light diffusing particles of Examples 1 to 2 and Comparative Example 1 were mixed and extruded in a biaxial extruder having a diameter of 45 mm according to the composition and content of Table 2, A flat plate specimen having a thickness of 1.5 mm was manufactured at a molding temperature of 240 ° C. using a 10 oz injection machine. The transmittance (total light transmittance, TT), haze and luminance were measured according to the following physical property measuring method The results are shown in Table 2 below.

Property evaluation method

(1) Transmittance (total light transmittance: T.T) (unit:%): Measured using a haze meter (NDH 5000W, Nippon Denshoku Industries Co., Ltd.).

(2) Haze (unit:%): Measured using a haze meter (NDH 5000W, Nippon Denshoku Industries Co., Ltd.).

(3) Luminance (unit: cd / m ² ): Five specimens having a thickness of 1.5 mm produced through the above extrusion were taken and the BM-7 luminometer (TOCON) was continuously used The mean values were compared and compared.

Example 4 Example 5 Comparative Example 2 Polystyrene resin
(Parts by weight) 100 100 100 Light diffusion particle Kinds Example 1 Example 2 Comparative Example 1 content
(Parts by weight) 2.0 3.0 4.0 2.0 3.0 4.0 2.0 3.0 4.0 T.T (%) 57.73 54.78 52.15 57.00 54.27 51.75 57.56 55.66 51.10 Haze (%) 96.1 95.8 95.5 96.14 95.81 95.46 96.0 95.7 95.5 T.T 57% Reference light diffusion particle content (parts by weight) 2.13 2.00 2.30 Brightness (cd / m ² ) 1059.36 1052.17 1047.01

From the results shown in the above Table 2, it is understood that the transmittance is lower and the haze is higher than that of the comparative example in the case of the optical diffusing plate specimens including the light diffusing particles of the present invention (Examples 1 to 2) (Example 4: 7.4% reduction compared to Comparative Example 2, Example 5: 13% reduction) in the case of the specimen having the same transmittance (57% standard) It can be seen that even using the diffusion particles, the brightness is excellent.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (14)

1. A polymer of a polyoxyalkylene siloxane having a repeating unit represented by the following formula (1) and a siloxane compound represented by the following formula (2)
Wherein the weight ratio of the polyorganosilsesquioxane to the siloxane compound is from 3: 1 to 30: 1.
[Chemical Formula 1]
RSiO _1.5-x (OH) _x
Wherein R is an alkyl group having 1 to 6 carbon atoms, a vinyl group or an aryl group, x is 0 or more and less than 1.5;
(2)

Wherein R ₁ and R ₂ are each independently an alkyl group having 1 to 5 carbon atoms, R ₃ and R ₄ are each independently an alkylene group having 2 to 15 carbon atoms, A ₁ and A ₂ are each independently a gly An epoxy group, and an average value of n is 10 to 50. [
The light-diffusing particle according to claim 1, wherein the polyoxyalkylene silsesquioxane has a mean particle size (D50) of 0.1 to 10 mu m.
The light-diffusing particle according to claim 1, wherein the siloxane compound comprises at least one compound selected from the group consisting of a compound represented by the following formula (2a) and a compound represented by the following formula (2b)
(2a)

(2b)

In Formulas (2a) and (2b), the average value of n is as defined in Formula (2).
The light-diffusing particle according to claim 1, wherein the refractive index of the light-diffusing particles is 1.40 to 1.428.
The light-diffusing particle according to claim 1, wherein the light-diffusing particles have an average particle diameter (D50) of 0.1 to 10 mu m.
And polymerizing a polyoxyalkylene siloxane compound containing a repeating unit represented by the following formula (1) and a siloxane compound represented by the following formula (2)
Wherein the weight ratio of the polyorganosilsesquioxane to the siloxane compound is from 3: 1 to 30: 1.
[Chemical Formula 1]
RSiO _1.5-x (OH) _x
Wherein R is an alkyl group having 1 to 6 carbon atoms, a vinyl group or an aryl group, x is 0 or more and less than 1.5;
(2)

Wherein R ₁ and R ₂ are each independently an alkyl group having 1 to 5 carbon atoms, R ₃ and R ₄ are each independently an alkylene group having 2 to 15 carbon atoms, A ₁ and A ₂ are each independently a gly An epoxy group, and an average value of n is 10 to 50. [
The method according to claim 6, wherein the polymerization is carried out by a sol-gel method.
The method of producing a light-diffusing particle according to claim 6, wherein the polyorganosiloxane is produced by polymerizing an organotrialkoxysilane by a sol-gel method.
The method according to claim 8, wherein the organotrialkoxysilane comprises at least one of methyltrimethoxysilane, methyltriethoxysilane, and methyltripropoxysilane.
Thermoplastic resin; And
A light diffusing plate comprising the light-diffusing particles according to any one of claims 1 to 5.
The optical diffusing plate according to claim 10, wherein the refractive index of the thermoplastic resin is 1.47 to 1.60.
11. The light diffuser plate according to claim 10, wherein the light diffusing particles are contained in an amount of 0.01 to 20 parts by weight based on 100 parts by weight of the thermoplastic resin.
The optical diffusing plate according to claim 10, wherein a difference in refractive index between the thermoplastic resin and the light diffusion particles is 0.01 to 0.17.
The optical diffusing plate according to claim 10, wherein the light diffusion plate has a transmittance of 57% or more, and the amount (by weight) of the light diffusion particles to be introduced is reduced by 5% or more relative to the polyosiloxane sesquioxane particle, mm thickness of the light diffusing plate is not less than 1,050 cd / m < ² >.