KR100988975B1 - Method for producing light diffusing thermoplastic resin composition - Google Patents

Abstract

The present invention relates to a light diffusing thermoplastic resin composition and a method for manufacturing the same, and more specifically, (A) 100 parts by weight of a transparent thermoplastic resin; (B) 0.05 to 2 parts by weight of a lipophilic liquid dispersion component having a refractive index difference of 0.03 or more from the transparent thermoplastic resin; And (C) relates to a thermoplastic resin composition comprising 0 to 10 parts by weight of oil, inorganic light diffusing agent.

The thermoplastic resin composition according to the present invention has an effect of excellent light diffusivity, impact strength and workability.

Transparent resin, silicone oil, light diffusing agent

Description

A manufacturing method of a light-diffusion thermoplastic resin composition {A METHOD OF PREPARING THERMOPLASTIC RESIN COMPOSITION HAVING LIGHT DIFFUSION PROPERTY}

The present invention relates to a light diffusing thermoplastic resin composition and a method for manufacturing the same, and more particularly, a thermoplastic resin composition having excellent performance of transmitting or diffusing light such as direct light, fluorescent light, or LED, and having excellent impact strength and workability. It relates to a manufacturing method thereof.

In general, resin compositions having light diffusing properties are widely used as materials for lighting covers, lighting signs, light-emitting switch signs, LCD light diffusion plates, and the like. It is getting better. 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 general, the light diffusing resin composition is prepared by adding a light diffusing agent to the transparent thermoplastic resin composition in order to secure light diffusion and light transmittance. However, organic and inorganic light diffusing agents introduced to secure light diffusing properties have a problem of deteriorating physical properties of the transparent thermoplastic resin used as the base resin. In particular, in the case of impact strength, the width of reduction is very large, and is reduced to 1/2 to 1/4 than before the light diffusing agent is added. This reduction in impact strength is a limitation on use.

In order to solve the problems of the prior art as described above, an object of the present invention is to provide a thermoplastic resin composition excellent in light diffusion, impact resistance, and workability.

Moreover, it aims at providing the manufacturing method of the thermoplastic resin composition which concerns on this invention.

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

In order to achieve the above object, the present invention

(A) 100 parts by weight of a transparent thermoplastic resin;

(B) 0.05 to 2 parts by weight of a lipophilic liquid dispersion component having a refractive index difference of 0.03 or more from the transparent thermoplastic resin; And

(C) It provides a thermoplastic resin composition comprising 0 to 10 parts by weight of an oil and an inorganic light diffusing agent.

In addition,

(1) preparing a transparent thermoplastic resin by an emulsion polymerization method or a complex method of emulsion polymerization and bulk polymerization; And

(2) It provides a method for producing a thermoplastic resin composition comprising the step of adding the lipophilic liquid dispersion component having a refractive index difference of 0.03 or more at the time of the emulsion polymerization.

According to the present invention, there is an effect of providing a thermoplastic resin composition excellent in light diffusion, impact resistance, and workability.

Hereinafter, the present invention will be described in detail.

The inventors of the present invention have developed a light-diffusing thermoplastic resin composition capable of exerting light diffusivity without deteriorating physical properties of the base resin by introducing a thermoplastic transparent resin as a base resin and adding a liquid dispersion component having a refractive index difference of 0.03 or more. As such, when the liquid dispersed phase is used instead of the light diffusing agent, the light diffusing effect can be exhibited in a small amount, and it can be said that it is effective in cost reduction by not using an expensive light diffusing agent.

The thermoplastic resin composition according to the present invention (A) 100 parts by weight of a transparent thermoplastic resin; (B) 0.05 to 2 parts by weight of a lipophilic liquid dispersion component having a refractive index difference of 0.03 or more from the transparent thermoplastic resin; And (C) 0 to 10 parts by weight of an oil and an inorganic light diffusing agent.

(A) Transparent thermoplastic resin

The transparent thermoplastic resin according to the present invention is not particularly limited, but rubber reinforcement such as impact-resistant PMMA (polymethyl methacrylate) resin and transparent ABS (acrylonitrile-butadiene-styrene) resin for improving mechanical strength such as impact strength It is preferable to use a transparent thermoplastic resin. The rubber-reinforced transparent thermoplastic resin is prepared by graft copolymerization of an (meth) acrylic acid alkyl ester compound, an aromatic vinyl compound, a vinyl cyan compound, or the like with an acrylate rubber or a conjugated diene rubber particle.

The acrylate rubber used in the present invention is an acrylate rubber such as butyl acrylate rubber, 2-ethylhexyl acrylate rubber, or the butyl acrylate-styrene copolymer, 2-ethylhexyl acrylate-acrylonitrile copolymer Copolymers composed of acrylates and monomers polymerizable therewith may be used.

In addition, as the conjugated diene rubber used in the present invention, butadiene polymer, butadiene-styrene copolymer (SBR), butadiene-acrylonitrile copolymer (NBR), ethylene-propylene copolymer (EPDM) and the like and similar polymers may be used. Can be.

The aromatic vinyl compounds used in the present invention include styrene, α-methylstyrene, p-methylstyrene, vinyltoluene, and the like, and styrene is particularly preferable.

In addition, the vinyl cyan compound used in the present invention is preferably acrylonitrile or methacrylonitrile.

Moreover, the (meth) acrylic-acid alkylester compound used by this invention 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 There are decyl ester, (meth) acrylic acid lauryl ester, and the like, and methyl methacrylate, which is (meth) acrylic acid methyl ester, is most preferred.

The refractive index of the graft copolymer absolutely affects transparency, and this refractive index is controlled by the amount of monomer used and the mixing ratio. That is, in order to have transparency, the refractive index of the rubber particle used as the seed for grafting and the refractive index of the entire component grafted therein should be similar, and the refractive index of the rubber particle and the entire grafted component coincide. desirable. If the refractive index difference between the rubber particle refractive index and the entire compound grafted thereto is 0.005 or more, it is not suitable for the present invention.

Although there is no limitation on the method for producing a rubber-reinforced transparent thermoplastic resin according to the present invention, it is generally prepared by the emulsion method or a complex method of emulsion polymerization and bulk polymerization. The two manufacturing methods do not have a difference in configuration, and only show differences in manufacturing processes.

The method for preparing a thermoplastic resin through emulsion polymerization is performed by graft copolymerization of 5 to 30 parts by weight of rubber latex with a methacrylic acid alkyl ester compound or an acrylic acid alkyl ester compound, an aromatic vinyl compound, and a vinyl cyan compound. The graft copolymer prepared is in the form of latex, and the latex is recovered in the form of dry powder through a process of coagulation, dehydration and drying.

In the method of preparing a thermoplastic resin through the complex method of emulsion polymerization and bulk polymerization, polymerized by the same method as the emulsion polymerization to prepare a dry powder, methacrylic acid alkyl ester-aromatic vinyl-vinyl having the same refractive index as rubber A copolymer of the cyan compound is prepared, and the prepared dry powder and the copolymer are kneaded through an extruder to prepare a rubber-reinforced transparent thermoplastic resin. When the thermoplastic resin is made by the complex method of the emulsion polymerization and the bulk polymerization, the manufacturing process is complicated and the initial equipment has to be made, but the rubber content can be easily controlled and the manufacturing cost is reduced.

(B) liquid dispersion component

Liquid dispersion component according to the invention is characterized in that the refractive index difference with the (A) transparent thermoplastic resin is 0.03 or more. The larger the difference in refractive index is, the better the light diffusivity effect is, and therefore the upper limit value is not limited. If the difference in refractive index is less than 0.03, the light diffusivity is insufficient, which is not suitable for the present invention.

Although there is no limitation on the liquid dispersion component according to the present invention, a hydrophobic material which is not reactive with a transparent thermoplastic resin and has stability such as thermal stability is preferable, and silicone oil is representative. Liquids with hydrophilicity are not suitable for the present invention as they may be washed away during the manufacturing process and during use.

In addition, the viscosity of the liquid dispersion component is preferably 5 centipoises or more. As long as the viscosity is 5 or more, even if the viscosity is very high, it does not affect the present invention. Viscosity materials of less than 5 centipoise are undesirable because they do not maintain the dispersed phase in the manufacturing process of the product and appear on the surface, and do not play a role of the dispersed phase for a long time.

The liquid dispersion component is used in 0.05 parts by weight to 2 parts by weight based on 100 parts by weight of the (A) transparent thermoplastic resin. If the content is less than 0.05 parts by weight it is not suitable for the present invention due to the lack of light diffusion. In addition, when the content exceeds 2 parts by weight, the light diffusivity is excellent, but the transmittance is worsened to become an opaque resin, and there is a problem of lowering the mechanical properties of the resin.

 In the preparation of the thermoplastic resin composition of the present invention, the liquid dispersion component is mixed with (A) the transparent thermoplastic resin, wherein (A) during the preparation of the rubber particles during the preparation of the transparent thermoplastic resin or in the grafting process Or in the extrusion process. However, in order to smoothly disperse the liquid dispersion component, it is preferable to add (A) during the emulsion polymerization process for the preparation of the transparent thermoplastic resin, that is, during the preparation and the grafting of the rubber particles. When the liquid dispersion component is added in the emulsion polymerization process, the liquid dispersion component is dispersed between the submicron size latex particles, thereby maximizing the light diffusion effect with a very small amount of the dispersion component. There is no particular limitation on the method of addition in the emulsion polymerization process, which can be added to the monomer or added directly to the latex. The liquid powder phase component introduced in the emulsion polymerization process is dispersed in the latex and coagulated and dried to exist in the dry powder.

(C) oil and inorganic light diffusing agents

In order to improve light diffusivity in a product composed of (A) a transparent thermoplastic resin and (B) a liquid dispersion component, 0 to 10 parts by weight of the (C) light diffusing agent may be additionally included.

The light diffusing agent used for this invention can use organic and inorganic light-diffusion agents, and can be used individually or in combination.

The inorganic light diffusing agent used in the present invention is not particularly limited, and calcium carbonate, barium sulfate, titanium dioxide, aluminum hydroxide, silica, glass, talc, mica, white carbon, magnesium oxide, zinc oxide, or the like may be used alone or in combination. Used in combination on paper.

The inorganic light diffusing agent preferably has an average particle diameter of 0.1 to 100 microns.

The organic light diffusing agent used in the present invention may include acrylic particles, siloxane particles, polycarbonate particles, styrene particles, and the like, and the type thereof is not limited. (A) Particles having a refractive index difference of 0.005 or more from a transparent thermoplastic resin It is preferable to use, and it is more preferable to use particles having a difference in refractive index of 0.01 or more. If the difference in refractive index is less than 0.005, there is a problem in that the hiding power for the light source is lowered due to poor light diffusivity.

The organic light diffusing agent is preferably an average particle diameter of 1 to 100 microns.

The oil or inorganic light diffusing agent according to the present invention is used in an amount of 0 to 10 parts by weight based on 100 parts by weight of the (A) transparent thermoplastic resin. When the content is more than 10 parts by weight, the light diffusivity is excellent, but the transmittance is worsened to become an opaque resin, there is a problem of lowering the mechanical properties of the resin.

The thermoplastic resin composition according to the present invention is (A) a transparent thermoplastic resin and

(B) optionally adding (C) the light diffusing agent into the mixture of the liquid dispersion component, and then adding a thermal stabilizer, UV stabilizer, or optical brightener in a range that does not affect the physical properties, and then a single screw extruder, twin screw extruder or Banbury It can be prepared by uniformly dispersing using a mixer or the like.

Hereinafter, preferred examples are provided to help understanding of the present invention, but the following examples are merely to illustrate the present invention, and the scope of the present invention is not limited to the following examples.

[(A) Transparent Thermoplastic Resin Production Example]

Production Example  One

Gel content 70%, 15 parts by weight of butadiene rubber latex having an average particle diameter of 0.3㎛, 100 parts by weight of ion-exchanged water, 1.0 parts by weight of sodium oleate emulsifier, 59 parts by weight of methyl methacrylate, 23 parts by weight of styrene, acrylonitrile 3 Parts by weight, tertiary dodecyl mercaptan 0.5 part by weight, sodium pyrophosphate 0.048 part by weight, dextorose 0.012 part by weight, ferrous sulfide 0.001 part by weight and cumene hydroperoxide 0.04 part by weight at 75 ° C. for 5 hours continuously Administered and reacted. After the reaction, the temperature was raised to 80 ° C., and aged for 1 hour to terminate the reaction. At this time, the polymerization conversion was 99.8% and the solidified content was 0.1%. The latex was coagulated with an aqueous calcium chloride solution and washed to obtain a powder. The refractive index of the ABS graft copolymer prepared through the emulsion polymerization was 1.516.

Production Example  2

(1) It was prepared in the same manner as in Preparation Example 1, except that 30 parts by weight of rubber latex, 48.3 parts by weight of methyl methacrylate, and 18.7 parts by weight of styrene were prepared in different contents. The refractive index of the ABS graft copolymer prepared through the emulsion polymerization was 1.516.

(2) The average reaction time of the raw material which mixed 68 weight part of methyl methacrylate, 22 weight part of styrene, and 10 weight part of acrylonitrile mixed 30 weight part of toluene as a solvent, and 0.15 weight part of dietary 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 polymer solution discharged from the reactor was heated in a preheating bath, the unreacted monomer was volatilized in the volatilization tank, and the temperature of the polymer was maintained at 210 ° C., so that the copolymer resin was processed into pellets using a polymer transfer pump extrusion machine. The final refractive index of the copolymer prepared through the bulk polymerization was 1.516.

(3) 50 parts by weight of the ABS graft copolymer prepared by the emulsion polymerization and 50 parts by weight of the copolymer prepared by the bulk polymerization were mixed in a mixer and pelletized using a twin screw extruder at a cylinder temperature of 220 ° C. It was prepared with.

Production Example  3

(1) 100 parts by weight of ion-exchanged water, 8.5 parts by weight of styrene, 40 parts by weight of butyl acrylate, 1 part by weight of ethylene glycol immethacrylate, 0.5 part by weight of allyl methacrylate, 0.5 part by weight of potassium persulfate, and lauryl sulfonic acid 0.2 parts by weight of sodium was added for 5 hours to polymerize. 100 parts by weight of water was added to the latex obtained by polymerization, and 50 parts by weight of methyl methacrylate, 1.0 part by weight of sodium lauryl sulfonate, 0.4 part by weight of tertiary dodecyl mercaptan, 0.048 part by weight of sodium pyrophosphate, and dextrose 0.012 Parts by weight, ferrous sulfide 0.001 parts by weight and cumene hydroperoxide 0.04 parts by weight were continuously administered at 75 ° C. for 5 hours and reacted. After the reaction, the temperature was raised to 80 ° C., and aged for 1 hour to terminate the reaction. At this time, the polymerization conversion was 99.5% and the solidified content was 0.1%. The latex is then coagulated with an aqueous calcium chloride solution, washed and a powder is obtained. The refractive index of the PMMA graft copolymer prepared through the emulsion polymerization was 1.49, and the weight average molecular weight was about 130,000.

(2) Prepared in the same manner as in Preparation Example 2 (2), but was polymerized by converting 68 parts by weight of methyl methacrylate, 22 parts by weight of styrene and 100 parts by weight of methyl methacrylate instead of 10 parts by weight of acrylonitrile. The refractive index of the PMMA graft copolymer prepared through the bulk polymerization was 1.49, and the weight average molecular weight was about 130,000.

(3) 50 parts by weight of the PMMA graft copolymer prepared by the emulsion polymerization and 50 parts by weight of the PMMA graft copolymer prepared by the bulk polymerization were mixed in a mixer to use a twin screw extruder at a cylinder temperature of 220 ° C. It was prepared in the form of pellets.

[Example]

Example  One

Silicone oil (polydimethylsiloxane) having a viscosity of 50 centipoise and a refractive index of 1.4 in "59 parts by weight of methyl methacrylate, 23 parts by weight of styrene, 3 parts by weight of acrylonitrile" which is a monomer part of the emulsion polymerization process of Preparation Example 1 ) 0.5 parts by weight was mixed, 0.1 parts by weight of lubricant and 0.2 parts by weight of antioxidant to prepare a pellet form using a twin screw extruder at a cylinder temperature of 220 ℃. The pellets were injected into the pellets to prepare specimens, and the physical properties thereof were measured by the following method.

Example  2

Silicone oil having a viscosity of 200 centipoise and a refractive index of 1.4 in the monomer portion "48.3 parts by weight of methyl methacrylate, 18.7 parts by weight of styrene, 3 parts by weight of acrylonitrile" in the emulsion polymerization process of Preparation Example 2 (1) ( 0.3 parts by weight of polydimethylsiloxane) were mixed, 0.1 parts by weight of lubricant, and 0.2 parts by weight of antioxidant were prepared in pellet form using a twin screw extruder at a cylinder temperature of 220 ° C. The pellets were injected into the pellets to prepare specimens, and the physical properties thereof were measured by the following methods.

Example  3

0.8 parts by weight of a silicone oil (polydimethylsiloxane) having a viscosity of 50 centipoise and a refractive index of 1.4 was mixed with "butyl acrylate" which is a rubber latex portion of the emulsion polymerization process of Preparation Example 3 (1), and 0.1 part by weight of lubricant. 0.2 parts by weight of an antioxidant was prepared in pellet form using a twin screw extruder at a cylinder temperature of 220 ° C. The pellets were injected into the pellets to prepare specimens, and the physical properties thereof were measured by the following methods.

Example  4

Silicone oil (polydimethylsiloxane) having a viscosity of 200 centipoise and a refractive index of 1.4 in "59 parts by weight of methyl methacrylate, 23 parts by weight of styrene, 3 parts by weight of acrylonitrile" which is a monomer part of the emulsion polymerization process of Preparation Example 1 ) 0.1 parts by weight, and additionally 3 parts by weight of polymethyl methacrylate (PMMA) having an average particle diameter of 7 microns and a refractive index of 1.49 as light diffusing agents, 0.1 part by weight of lubricant, 0.2 weight of antioxidant Part was prepared in pellet form using a twin screw extrusion kneader at a cylinder temperature of 220 ℃. The pellets were injected into the pellets to prepare specimens, and the physical properties thereof were measured by the following methods.

Comparative example  One

Silicone oil (polydimethylsiloxane) having a viscosity of 300 centipoise and a refractive index of 1.5 in "59 parts by weight of methyl methacrylate, 23 parts by weight of styrene, 3 parts by weight of acrylonitrile" which is a monomer part of the emulsion polymerization process of Preparation Example 1 ) 0.6 parts by weight was further mixed, 0.1 part by weight of lubricant and 0.2 part by weight of antioxidant were prepared in pellet form using a twin screw extruder at a cylinder temperature of 220 ° C. The pellets were injected into the pellets to prepare specimens, and the physical properties thereof were measured by the following methods.

Comparative example  2

0.3 parts by weight of a silicone oil (polydimethylsiloxane) having a viscosity of 200 centipoise and a refractive index of 1.4 at the time of extrusion during the bulk polymerization process of Preparation Example 2 (2), 0.1 part by weight of lubricant, and 0.2 part by weight of antioxidant To a pellet form using a twin screw extrusion kneader at a cylinder temperature of 220 ℃. The pellets were injected into the pellets to prepare specimens, and the physical properties thereof were measured by the following methods.

Comparative example  3

Silicone oil having a viscosity of 4 centipoise and a refractive index of 1.39 in "48.3 parts by weight of methyl methacrylate, 18.7 parts by weight of styrene, 3 parts by weight of acrylonitrile" which is a monomer part of the emulsion polymerization process of Preparation Example 2 (1) 0.3 parts by weight of (polydimethylsiloxane) were mixed, 0.1 parts by weight of lubricant and 0.2 parts by weight of antioxidant were prepared in pellet form using a twin screw extruder at a cylinder temperature of 220 ° C. The pellets were injected into the pellets to prepare specimens, and the physical properties thereof were measured by the following methods.

Comparative example  4

15 parts by weight of polystyrene (PS) having an average particle diameter of 20 micrometers and a refractive index of 1.59 was mixed with the ABS graft copolymer according to Preparation Example 1, 0.1 part by weight of lubricant, and 0.2 part by weight of antioxidant. It was prepared in pellet form using a twin screw extruder at a cylinder temperature of 220 ° C. The pellets were injected into the pellets to prepare specimens, and the physical properties thereof were measured by the following methods.

[Test Example]

Haze Value: A sheet of 2 mm was prepared and the light diffusivity was measured according to ASTM D-1003.

Total Transmittance: A sheet of 2 mm was prepared and total light transmittance was measured according to ASTM D-1003.

Notched Izod Impact Strength: Notched Izod impact strength was measured according to ASTM D-256. Measurements were made using 1/8 "specimens.

Melt Index: The flowability was measured by ASTM D-1238.

Extruded pellets were used and measured at 220 ° C., 10 kg.

TABLE 1

(A) Transparent thermoplastic resin (B) Liquid Dispersion Components (C) Light Diffusion Agent (Type / Content) Input method of (B) Silicone Oil Viscosity / Refractive Index content Example 1 Preparation Example 1 50 / 1.4 0.5 Mixed with monomer Example 2 Production Example 3 200 / 1.4 0.3 Direct injection into rubber latex Example 3 Preparation Example 1 50 / 1.4 0.8 Mixed with monomer Example 4 Preparation Example 1 200 / 1.4 0.1 PMMA / 3 Mixed with monomer Comparative Example 1 Production Example 2 300 / 1.5 0.6 Input during extrusion Comparative Example 2 Production Example 2 200 / 0.4 0.3 Mixed with monomer Comparative Example 3 Preparation Example 1 4 / 1.39 0.3 Comparative Example 4 Preparation Example 1 PS / 15

TABLE 2

Light diffusivity
(Haze)
Light transmittance (Tt) Impact Strength (Imp.) liquidity
(MI) Example 1 89 71 12 15 Example 2 82 81 12 16 Example 3 83 86 5 11 Example 4 84 76 8 7 Comparative Example 1 3 90 12 15 Comparative Example 2 32 83 12 10 Comparative Example 3 49 87 5 7 Comparative Example 4 86 71 2 -

Through Table 2, Examples 1 to 3 using a silicone oil having a refractive index difference of 0.03 or more in the transparent thermoplastic resin according to the present invention, and Example 4 additionally added a light diffusing agent are excellent in the impact strength while maintaining the light diffusion It can be confirmed that excellent.

On the other hand, Comparative Example 1 using a transparent thermoplastic resin and a silicone oil having a refractive index difference of less than 0.03 can confirm that light diffusion is not well achieved.

In addition, Comparative Example 2 prepared by injecting a silicone oil, which is a liquid dispersion component during extrusion, can be confirmed that sufficient dispersion is made and light diffusion is inferior.

In addition, Comparative Example 3 using a low-viscosity liquid dispersion component, even if well dispersed in the manufacturing process, the phase separation occurs after the surface of the post-processing, such as extrusion, it did not show sufficient light diffusion characteristics, the surface when used for a long time It was confirmed that the present invention is not suitable for the present invention.

In addition, in Comparative Example 4 using only the light diffusing agent without using the liquid dispersion component, it can be confirmed that the light diffusing effect is sufficient, but the impact strength is not sharply reduced.

Although described in detail above with reference to the specific embodiments of the present invention, it will be apparent to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention, and such modifications and modifications belong to the appended claims. It is also natural.

Claims (19)

delete delete delete delete delete delete delete delete delete delete delete delete delete (1) preparing a transparent thermoplastic resin by an emulsion polymerization method or a complex method of emulsion polymerization and bulk polymerization; And (2) A method of producing a thermoplastic resin composition comprising the step of adding the lipophilic liquid dispersion component having a refractive index difference of 0.03 or more to the transparent thermoplastic resin during the emulsion polymerization. 15. The method of claim 14, Method for producing a thermoplastic resin composition, comprising the step of adding an organic, inorganic light diffusing agent. 15. The method of claim 14, The transparent thermoplastic resin is a method for producing a thermoplastic resin composition, characterized in that the impact resistant PMMA (polymethyl methacrylate) resin or transparent ABS (acrylonitrile-butadiene-styrene) resin. 15. The method of claim 14, The liquid dispersion component is a method for producing a thermoplastic resin composition, characterized in that the silicone oil. 15. The method of claim 14, The viscosity of the liquid dispersion component is a manufacturing method of the thermoplastic resin composition, characterized in that more than 5 centipoise. The method of claim 15, The light diffusing agent is a manufacturing method of the thermoplastic resin composition, characterized in that the refractive index difference from the transparent thermoplastic resin is 0.005 or more.