KR101132143B1 - Light-diffusing resin composition having imporved physical properties and corrosion resistance - Google Patents

Abstract

The present invention relates to a light diffusing resin composition comprising an alkyl acrylate rubber resin as a matrix resin. In the alkyl acrylate rubber resin, a monomer mixture of a methacrylic acid alkyl ester compound or an acrylic acid alkyl ester compound, an aromatic vinyl compound and a vinyl cyan compound or a copolymer thereof may be graft polymerized. The light diffusing resin composition of the present invention is excellent in mechanical properties such as impact resistance and workability and weather resistance.

Light Diffusion, Alkylacrylate Rubber Resin, Weatherability, Processability

Description

Light diffusion resin composition with excellent mechanical properties and weather resistance {LIGHT-DIFFUSING RESIN COMPOSITION HAVING IMPORVED PHYSICAL PROPERTIES AND CORROSION RESISTANCE}

The present invention relates to a light diffusing resin composition excellent in light diffusivity, impact strength, processability and weatherability. The present invention relates to a light diffusing resin composition having excellent performance of transmitting or diffusing light such as direct sunlight, fluorescent lamps, or LED lamps, and having excellent weather resistance, impact resistance, and workability.

In general, a resin composition having light diffusibility is widely used as a material such as a lighting cover, a lighting signboard, a light-emitting switch signboard, and recently, interest has been further improved due to the development of the display industry and the change of the lighting industry. In particular, in the case of LED lighting, in order to compensate for the low light distribution of the LED, the light diffusivity must be increased as much as possible, and the light transmittance must be high to prevent the loss of light. In addition, when it is to be used for lighting signboards, outdoor billboards, etc., it must have a certain degree of impact strength, and must also have workability to enable the extrusion of large objects.

In order to achieve the above object, generally a light-diffusion resin composition is manufactured by adding a light-diffusion agent to ensure light-diffusion and light transmittance to a base resin (matrix resin). As the matrix resin, thermoplastic transparent resins such as methacryl resin, styrene resin, and polycarbonate resin are used.

However, the above-mentioned thermoplastic transparent resin is limited in use due to the nature of the resin. That is, methacryl-based resin and styrene-based resin has a problem of breaking well because of low impact strength. In order to overcome these disadvantages, an acrylic impact modifier may also be used in the methacrylic resin, but the impact strength has been improved to a very limited impact strength of 3 or less (Korean Patent Application No. 10-2002-86995).

On the other hand, when the polycarbonate resin is used, the impact strength is excellent, but because the workability is very low, complicated processing is impossible.

On the other hand, Korean Patent Registration No. 0511487 describes a light-diffusion laminated resin sheet in which a methyl methacrylate resin or a styrene resin containing a rubbery polymer and a methyl methacrylate resin or a styrene resin are laminated in two layers. There is a disadvantage that a complicated manufacturing process is required to produce the sheet.

In addition, US Pat. No. 4,767,833, Japanese Patent No. 11-147920, and European Patent No. 1045883 introduce acrylic resins or methacrylic acid alkyl esters to ABS resins to provide excellent impact resistance and workability. This is not good and can not be used for outdoor use, there is a problem that the physical properties are greatly degraded over time. In order to improve such weather resistance and thermal stability, a resin is prepared by adding an additive such as a thermal stabilizer and a UV stabilizer to the resin, but it is not a fundamental measure.

Therefore, there has been a demand for the development of a light diffusing resin having excellent mechanical properties such as workability, impact strength and weather resistance.

An object of the present invention is to provide a light diffusing resin composition having excellent mechanical properties such as workability, impact strength and weather resistance.

According to the above object, the present invention comprises 100 parts by weight of a thermoplastic transparent resin (A) and 0.1 to 20 parts by weight of a light diffusing agent (B) comprising an alkyl acrylate rubber resin, the thermoplastic transparent resin (A) and the light Provided is a light diffusing resin composition, wherein a difference in refractive index between the diffusing agent (B) is 0.005 or more.

The thermoplastic transparent resin (A) is a monomer mixture of 5 to 30 parts by weight of an alkyl acrylate rubber resin, a monomer mixture of 10 to 90 parts by weight of an alkyl acrylate compound or an acrylic acid alkyl ester compound and 5 to 50 parts by weight of an aromatic vinyl compound is graft-polymerized. It is.

In addition, the monomer mixture to be graft polymerized to the alkyl acrylate rubber resin of the thermoplastic transparent resin (A) may further include 1 to 20 parts by weight of the vinyl cyan compound.

On the other hand, the thermoplastic transparent resin (A) included in the light-diffusion resin composition of the present invention is one obtained by graft polymerization of an alkyl acrylate rubber resin with a copolymer of a methacrylic acid alkyl ester compound or an acrylic acid alkyl ester compound and an aromatic vinyl compound. Can be.

In addition, the copolymer graft-polymerized to the resin of the alkyl acrylate rubber may be a copolymer of a methacrylic acid alkyl ester compound or an acrylic acid alkyl ester compound, an aromatic vinyl compound and a vinyl cyan compound.

In the light-diffusion resin composition of the present invention, the difference in refractive index between the alkyl acrylate rubber resin and the methacrylic acid alkyl ester compound or the acrylic acid alkyl ester compound, the aromatic vinyl compound, and the vinyl cyan compound in the thermoplastic transparent resin (A) is 0.005. It is preferable that it is less than.

It is preferable that the said alkyl acrylate rubber resin is 600 kPa-5000 kPa of average particle diameters.

And it is preferable that the said light-diffusion agent (B) is spherical of 0.1-100 micrometers of average particle diameters.

The light diffusing agent (B) may be at least one selected from the group consisting of calcium carbonate, barium sulfate, titanium dioxide, aluminum hydroxide, silica, glass, talc, mica, white carbon, magnesium oxide and zinc oxide.

It is preferable that the refractive index difference of the thermoplastic transparent resin (A) and the light-diffusion agent (B) contained in the light-diffusion resin composition of this invention is 0.005 or more.

Thermoplastic transparent resin (A) contained in the light-diffusion resin composition of the present invention comprises the first step of copolymerizing 10 to 90 parts by weight of the methacrylic acid alkyl ester or acrylic acid alkyl ester compound and 5 to 60 parts by weight of the aromatic vinyl compound; And it may be prepared from the second step of graft polymerization of the copolymer with 5 to 30 parts by weight of alkyl acrylate rubber.

In addition, the compound copolymerized in the first step may further include 1 to 20 parts by weight of the vinyl cyan compound.

In addition, the alkyl acrylate rubber of the second step may be a copolymer of a methacrylic acid alkyl ester compound or an acrylic acid alkyl ester compound, and an aromatic vinyl compound.

The present invention is described in detail as follows.

The light diffusing resin composition of the present invention comprises 100 parts by weight of a thermoplastic transparent resin (A) containing an alkyl acrylate rubber resin as a matrix resin and 0.1 to 20 parts by weight of a light diffusing agent (B) as a domain. The difference in refractive index of the light diffusing agent is characterized in that 0.005 or more.

Hereinafter, the thermoplastic transparent resin (A) and the light diffusing agent (B) will be described.

(A) Thermoplastic Transparent Resin

The light-diffusion resin composition of this invention contains the thermoplastic transparent resin (A) containing an alkylacrylate rubber resin as a matrix resin.

The thermoplastic transparent resin (A) of the present invention is a form obtained by graft polymerization of a monomer mixture of a methacrylic acid alkyl ester compound or an acrylic acid alkyl ester compound, an aromatic vinyl compound and a vinyl cyan compound, using the alkyl acrylate rubber resin as a main chain. .

Alternatively, the thermoplastic transparent resin (A) may be a copolymer of a monomer mixture of a methacrylic acid alkyl ester compound or an acrylic acid alkyl ester compound, an aromatic vinyl compound and a monomer compound of a vinyl cyan compound in advance, and then the copolymer is added to an alkyl acrylate rubber resin. It may be graft polymerized.

The alkyl acrylate rubber resin used as the thermoplastic transparent resin (A) in the light-diffusion resin composition of the present invention preferably has an average particle diameter in the range of 600 kPa to 5000 kPa. If the particle diameter of the alkyl acrylate rubber resin is out of the above range, it is because the impact resistance and processability is not brought about a desirable result. Therefore, the light-diffusion resin composition of this invention is provided using the alkylacrylate rubber resin which has the particle diameter of the said range.

Matrix resin in the light-diffusion resin composition of the present invention is 5 to 30 parts by weight of the alkyl acrylate rubber resin (based on solids), methacrylic acid alkyl ester compound or acrylic acid alkyl ester compound 10 to 90 parts by weight and aromatic vinyl compound 5 to 60 parts by weight of copolymer. In addition, the matrix resin may be a copolymer further comprising 1 to 20 parts by weight of a vinyl cyan compound.

In particular, the copolymer of the matrix resin is a form in which the remaining compound, that is, methacrylic acid alkyl ester compound or acrylic acid alkyl ester compound, aromatic vinyl compound, and vinyl cyan compound are graft-polymerized with an alkyl acrylate rubber resin as a main chain. The graft polymerized compounds may be graft polymerized directly into the main chain of the alkyl acrylate rubber resin as a monomer, or may be provided in a prepolymerized state to be graft polymerized.

On the other hand, since the alkyl acrylate rubber resin is provided as a polymer solution in the form of a latex containing an insoluble component, the alkyl acrylate rubber resin used for preparing the matrix resin in the present invention is insoluble solids in the latex polymer, that is, the gel content It shows the composition ratio.

When the content of the alkyl acrylate rubber resin is less than 5 parts by weight, the light-diffusion composition is poor in terms of impact resistance and is easily broken.

In addition, the refractive index of the graft polymer prepared from the monomer mixture when the methacrylic acid alkyl ester compound or acrylic acid alkyl ester compound 10 to 90 parts by weight and the aromatic vinyl compound 5 to 60 parts by weight is out of the range of the refractive index of the alkyl acrylate rubber resin It is not suitable for the present invention because it affects the transparency of the thermoplastic transparent resin.

The thermoplastic transparent resin of the present invention may optionally contain 1 to 20 parts by weight of a vinyl cyan compound. When the vinyl cyan compound is less than 1 part by weight, the effect of improving impact strength is small, and when it exceeds 20 parts by weight, the color turns yellow, which adversely affects the color of the final product.

In the light-diffusion resin composition of the present invention, the matrix resin is a methacrylic acid alkyl ester compound or a mixture of an acrylic acid alkyl ester compound and an aromatic vinyl compound with an alkyl acrylate rubber resin as a main chain, or a monomer of a vinyl cyan compound Or a copolymer previously prepared from monomer mixtures of the compounds may be in graft polymerized form.

In this case, the refractive index of the methacrylic acid alkyl ester compound or the acrylic acid alkyl ester compound, the aromatic vinyl compound, and the vinyl cyan compound mixture or copolymer prepared therefrom is grafted to the main chain alkyl acrylate rubber resin. Absolutely affects. That is, the transparency of the thermoplastic transparent resin (A) is determined according to the components and the composition of the compounds to be graft polymerized.

In order for the thermoplastic transparent resin (A) to have transparency, the refractive index of the alkyl acrylate rubber resin used as the main chain of the graft polymer and the monomer mixture graft-polymerized on the alkyl acrylate rubber resin or those polymers should be less than 0.005. Preferably, the refractive index is the same.

On the other hand, if the difference between the refractive index of the alkyl acrylate rubber resin and the refractive index of the graft polymerized monomer mixture or those polymers is 0.005 or more, the thermoplastic transparent resin (A) no longer has transparency, which is not preferable.

The thermoplastic transparent resin (A) in the light diffusing resin composition of the present invention may be prepared by an emulsion polymerization or a complex method of emulsion polymerization and bulk polymerization.

In the emulsion polymerization method, 10 to 90 parts by weight of a methacrylic acid alkyl ester compound or an acrylic acid alkyl ester compound and 5 to 60 parts by weight of an aromatic vinyl compound are graft polymerized to 5 to 30 parts by weight of an alkyl acrylate rubber resin. In addition, the vinyl cyan compound may be further subjected to 1 to 20 parts by weight graft polymerization. The polymer obtained by the above production method is in the form of latex, can be recovered in the form of dry powder by the process of flocculation, dehydration and drying.

On the other hand, the composite method of emulsion polymerization and bulk polymerization for the preparation of the thermoplastic transparent resin (A) is to produce a polymer in dry powder form by the above-mentioned emulsion polymerization method, on the other hand alkyl methacrylate to have the same refractive index as the polymer Copolymers of esters, aromatic vinyls and vinyl cyan compounds are prepared. Then, by mixing the polymer in the dry powder form and the copolymer through an extruder to prepare a thermoplastic transparent resin (A).

The complex method of the emulsion polymerization and the bulk polymerization has a disadvantage in that the manufacturing process is complicated compared to the emulsion polymerization method and the initial equipment has to be made, but it is easy to control the content of the alkyl acrylate rubber resin in the thermoplastic transparent resin (A) and the manufacturing cost It has the advantage of being saved.

As the alkyl acrylate monomer included in the thermoplastic transparent resin (A) in the light diffusing resin composition of the present invention, any of alkyl acrylates such as methyl acrylate, ethyl acrylate, propyl acrylate, and butyl acrylate can be used. However, butyl acrylate is mainly used.

In addition, the aromatic vinyl compound may be at least one selected from styrene, α-methylstyrene, p-methylstyrene, and vinyltoluene. Styrene is particularly preferred.

In addition, the vinyl cyan compound may be acrylonitrile or methacrylonitrile.

Moreover, the (meth) acrylic-acid alkylester compound is a (meth) acrylic acid methyl ester, (meth) acrylic acid ethyl ester, (meth) acrylic acid propyl ester, (meth) acrylic acid 2-ethylhexyl ester, (meth) acrylic acid decyl ester, and (meth) It may be one or more selected from lauryl ester. In particular, methyl methacrylate which is (meth) acrylic acid methyl ester is preferable.

(B) light diffusing agent

Next, the light-diffusion resin composition of this invention contains a light-diffusion agent as a domain.

As the light diffusing agent (B), an organic or inorganic light diffusing agent may be used alone or in combination.

The light diffusing agent (B) included in the light diffusing resin composition of the present invention may have an average particle diameter of 1 to 100 microns. This is because when the light diffusing agent (B) having a particle diameter of 100 microns or more is used, a preferable light diffusing degree is not obtained. Preferably the light diffusing agent (B) has an average particle diameter of 1 to 10 microns.

The inorganic light diffusing agent included in the light diffusing resin composition of the present invention is not particularly limited and includes calcium carbonate, barium sulfate, titanium dioxide, aluminum hydroxide, silica, glass, talc, mica, white carbon, magnesium oxide, and zinc oxide. It may be one or more selected from the group consisting of.

The inorganic light diffusing agent may have an average particle diameter of 0.1 to 20 microns, and the content in the light diffusing resin composition of the present invention may be used in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the thermoplastic transparent resin (A).

The organic light diffusing agent included in the light diffusing resin composition of the present invention may be an acrylic resin, a siloxane resin, a polycarbonate resin, or a styrene resin. The average particle diameter of the organic light diffusing agent may be 1 to 100 microns, the content in the light diffusing resin composition of the present invention may be used in 0.1 to 20 parts by weight based on 100 parts by weight of the thermoplastic transparent resin (A).

When using a light diffusing agent of less than 0.1 parts by weight can not obtain the desired level of light diffusion, when used in excess of 20 parts by weight the relative concentration of the thermoplastic transparent resin (A) in the light diffusing resin composition is lowered in the product This results in reduced impact. In addition, it results in a significantly lower light transmittance.

In the light diffusing resin composition of the present invention, the difference in refractive index between the thermoplastic transparent resin (A) and the light diffusing agent (B) is preferably 0.005 or more, and more preferably 0.01 or more.

This is because when the difference in refractive index is less than 0.005, light diffusivity is poor and a large amount of light diffusing agent needs to be used.

The light diffusing composition of the present invention may include a heat stabilizer, a UV stabilizer, a fluorescent brightener, etc. in a range that does not affect the physical properties other than the (A) thermoplastic transparent resin and (B) the light diffusing agent. The composition is uniformly dispersed using a single screw extruder, twin screw extruder or Banbury mixer or the like. Then, the tank is passed through and cut to prepare a light diffusing resin in pellet form.

Hereinafter, the present invention will be described in more detail with reference to Examples, which are intended to help a specific understanding of the present invention, and the present invention is not limited to the following Examples.

Preparation Example 1

90 parts by weight of ion-exchanged water, 0.2 parts by weight of sodium oleate emulsifier, 63 parts by weight of methyl methacrylate, 14 parts by weight of butyl acrylate latex polymer (70% of solvent-insoluble gel content, average particle diameter of 0.3 μm) 3 parts by weight of acrylonitrile, 0.25 parts by weight of tertiary dodecyl mercaptan, 0.048 parts by weight of sodium pyrophosphate, 0.012 parts by weight of dextrose, 0.001 parts of ferrous sulfide and 0.10 parts of cumene hydroperoxide at 73 ° C. Continuous administration for 5 hours and reaction. After the reaction was raised to 76 ℃ aging for 1 hour and the reaction was terminated. At this time, the polymerization conversion was 99.5% and the solidified content was 0.1%.

Next, it solidified and wash | cleaned with the calcium chloride aqueous solution, and obtained powdery thermoplastic transparent resin (A-1). The refractive index of the obtained thermoplastic transparent resin was 1.508, and the weight average molecular weight was 120,000.

Production Example 2

(1) 30 parts by weight of a butyl acrylate latex polymer (70% insoluble gel content, average particle diameter of 0.3 μm), 56 parts by weight of methyl methacrylate, 12 parts by weight of styrene, and 2 parts by weight of acrylonitrile A thermoplastic transparent resin was synthesized in the same manner as in Preparation Example 1, except that.

(2) The average reaction time of a raw material obtained by mixing 75 parts by weight of methyl methacrylate, 15 parts by weight of styrene and 10 parts by weight of acrylonitrile was mixed with 30 parts by weight of toluene as a solvent and 0.15 parts by weight of dodecyl mercaptan as a molecular weight regulator. The reaction temperature was continuously added to the reactor for 3 hours to maintain the reaction temperature at 148 ° C. The polymerization liquid discharged from the reactor was heated in a preheating bath and volatilized unreacted monomer in a volatilization bath.

Next, to maintain the temperature of 210 ℃ to prepare a copolymer in pellet form using a polymer transfer pump extrusion machine.

(3) After mixing 66 parts by weight of the thermoplastic transparent resin of (1) and 34 parts by weight of the copolymer of (2) in a mixer, using a twin screw extrusion kneader at a cylinder temperature of 220 ℃ using a pellet-shaped thermoplastic transparent resin ( A-2) was prepared. The weight average molecular weight of the prepared copolymer was 120,000, the refractive index was 1.508.

Production Example 3

A thermoplastic transparent resin (A-3) was prepared in the same manner as in Preparation Example 2 (2), except that 100 parts by weight of methyl methacrylate was used and styrene and acrylonitrile were not used. The weight average molecular weight of the obtained thermoplastic transparent resin was 130,000, and the refractive index was 1.49.

Preparation Example 4

(1) 20 parts by weight of butadiene latex polymer (70% insoluble gel content, average particle diameter of 0.3 μm), 55 parts by weight of methyl methacrylate, 20 parts by weight of styrene, and 5 parts by weight of acrylonitrile are used. In the same manner as in Preparation Example 1, a thermoplastic transparent resin (A-4) was synthesized. The copolymer had a weight average molecular weight of 100,000 and a refractive index of 1.517.

Examples 1 to 3 and Comparative Examples 1 to 6

The thermoplastic transparent resin (A) of Preparation Examples 1 to 4 and the light diffusing agent (B) of Table 1 were mixed in the same ratio as in Table 2 below, and 0.1 parts by weight of lubricant and 0.2 parts by weight of antioxidant were administered at 220 ° C. Prepared in pellet form using a twin screw extruder at cylinder temperature.

[Table 1]

division Average particle diameter Appearance Refractive index B-1 7 Polystyrene (PS) 1.59 B-2 7 Polymethylmethacrylate (PMMA) 1.495 B-3 7 PS-PMMA (20:80) Copolymer 1.512 B-4 20 Polystyrene (PS) 1.59 B-5 150 Polymethylmethacrylate (PMMA) 1.495

TABLE 2

Thermoplastic Transparent Resin Light diffusing agent A-1 A-2 A-3 A-4 B-1 B-2 B-3 B-4 B-5 Example 1 100 5 Example 2 100 5 Example 3 100 10 Comparative Example 1 100 10 Comparative Example 2 100 5 Comparative Example 3 100 30 Comparative Example 4 100 5 Comparative Example 5 100 5

The pellet was injected to prepare a specimen and the physical properties were measured by the following method.

1. Light Diffusion

Light diffusivity was measured by measuring the Haze Value of a sheet of 2 mm using ASTM D-1003.

2. Total Transmittance

The total light transmittance of a sheet of 2 mm was measured using ASTM D-1003.

3. Notched Izod Impact Strength

Notched Izod impact strength of 1/8 "specimens was measured using ASTM D-256.

4. Melt Index

The flowability of the extruded pellets was measured at 220 ° C. and 10 kg using ASTM D-1238.

5.surface polished

Measurements were made using the ASTM D528 (45 ° Angle) method.

6. Weather resistance

After leaving the resin at 400 ° C for 18 hours / 120 minutes at 83 ° C in a weather-o-meter (Weatherometer, AT35 Ci35A)

Gloss was measured.

The physical property measurement results are shown in Table 3 below.

[Table 3]

Light diffusivity Light transmittance Impact strength liquidity Surface gloss Weatherability Example 1 88 70 12 17 93 88 Example 2 81 80 12 16 93 87 Example 3 82 85 11 16 94 89 Comparative Example 1 29 86 11 12 92 85 Comparative Example 2 41 85 13 12 93 83 Comparative Example 3 91 34 6 6 94 85 Comparative Example 4 89 68 <1 7 91 84 Comparative Example 5 89 80 15 14 94 60

In Examples 1 to 3, the haze value and the total light transmittance (Tt) were high, and the impact strength and the workability were also high.

On the other hand, in Comparative Example 1, the difference in refractive index between the thermoplastic transparent resin (A) and the light diffusing agent (B) was 0.004, and the difference in refractive index was too small to obtain a desired level of light diffusion.

In Comparative Example 2, the average particle diameter of the light diffusing agent (B) was too large to obtain a desired level of light diffusing characteristics.

In Comparative Example 3, the impact strength was low due to excessive use of the light diffusing agent (B), and the light transmittance was very low.

In Comparative Example 4, the use of polymethyl methacrylate as the thermoplastic transparent resin did not obtain a desired level of impact strength.

The conjugated diene-based resin used in Comparative Example 5 was excellent in impact strength and workability, but poor in weatherability.

According to the present invention, by using an alkyl acrylate rubber resin as a matrix resin, it is possible to provide a light-diffusion resin composition having a simple manufacturing process and improved impact resistance and workability.

Claims (13)

100 parts by weight of a thermoplastic transparent resin (A) containing an alkyl acrylate rubber resin and 0.1 to 20 parts by weight of a light diffusing agent (B), The thermoplastic transparent resin (A) is 5 to 30 parts by weight of an alkyl acrylate rubber resin, 10 to 90 parts by weight of an alkyl methacrylate compound or an acrylic acid alkyl ester compound, 5 to 60 parts by weight of an aromatic vinyl compound, and vinyl cyan compound 1 To 20 parts by weight of the monomer mixture is copolymerized, The difference in refractive index between the thermoplastic transparent resin (A) and the light diffusing agent (B) is 0.005 or more. delete delete The method of claim 1, The thermoplastic transparent resin (A) is an optical acid resin composition, characterized in that the monomer mixture of methacrylic acid alkyl ester compound or acrylic acid alkyl ester compound, aromatic vinyl compound, and vinyl cyan compound is further graft polymerized. delete The method of claim 1, The difference in refractive index between the alkyl acrylate rubber resin and the monomer mixture of the methacrylic acid alkyl ester compound or the acrylic acid alkyl ester compound, the aromatic vinyl compound and the vinyl cyan compound is less than 0.005. delete The method of claim 1, The alkyl acrylate rubber resin is a light diffusing resin composition, characterized in that the average particle diameter is 600 kPa to 5000 kPa. The method of claim 1, The light diffusing agent (B) is a light diffusing resin composition, characterized in that the spherical particle diameter of 0.1 to 100 microns. The method of claim 1, The light diffusing agent (B) is acrylic resin, siloxane resin, polycarbonate resin, styrene resin, calcium carbonate, barium sulfate, titanium dioxide, aluminum hydroxide, silica, glass, talc, mica, white carbon, magnesium oxide and It is 1 or more types chosen from the group which consists of zinc oxide, The light-diffusion resin composition characterized by the above-mentioned. (A) 10 to 90 parts by weight of the methacrylic acid alkyl ester compound or acrylic acid alkyl ester compound, 5 to 60 parts by weight of the aromatic vinyl compound, and 1 to 20 parts by weight of the vinyl cyan compound Copolymerizing the mixture to prepare a thermoplastic transparent resin (A); And (B) 100 parts by weight of the prepared thermoplastic transparent resin (A) and 0.1 to 20 parts by weight of a light diffusing agent (B), the method of producing a light diffusion resin composition comprising the step of mixing. The method of claim 11, After copolymerizing the monomer mixture in the above (A), the monomer mixture of the methacrylic acid alkyl ester compound or acrylic acid alkyl ester compound, aromatic vinyl compound, and vinyl cyan compound is further graft polymerized to prepare a thermoplastic transparent resin (A) The manufacturing method of the light-diffusion resin composition characterized by the above-mentioned. delete