JP2020117705A - Thermoplastic resin composition and molded body - Google Patents

Abstract

To provide a thermoplastic resin composition suitable for a surface-emitting molded body in which a surface perpendicular to an incident direction is not uniform but surface-emitting with a glittering brilliance when light is incident from a side surface in a thickness direction by an edge light system and is turned on, and a molded body of the thermoplastic resin composition.SOLUTION: The thermoplastic resin composition is provided that contains 0.001-0.09 pts.mass of spherical particles (B) having a hollow structure having an average particle diameter of 12-40 μm, a diameter of a hollow part of 10 μm or more and a bulk ratio of the hollow part of 50% or more with respect to 100 pts.mass of a transparent thermoplastic resin (A).SELECTED DRAWING: Figure 1

Description

The present invention relates to a thermoplastic resin composition and a molded body, and more specifically, the molded body is visually transparent when not lit, and light is incident from the side surface in the thickness direction by an edge light method and when lit. TECHNICAL FIELD The present invention relates to a thermoplastic resin composition suitable for a surface-emitting molded body in which a surface perpendicular to the incident direction is not uniform but surface-emitting with a sparkle and a molded body thereof.

Polycarbonate resin is widely used as a resin having excellent mechanical strength, heat resistance, transparency and the like in various fields such as electric/electronic devices, OA equipment parts, automobile parts, building materials, medical applications, and sundries. Further, in recent years, it has been favorably used as a component of a surface light source body of a liquid crystal display device in electric and electronic equipment such as computers, electronic books, mobile phones, and OA equipment.

As an edge light type surface light source used for a liquid crystal display device, a pattern having a diffusing action such as milky white is printed on the back surface of a molding plate made of a transparent resin such as polymethylmethacrylate resin (Patent Document 1), or a molding plate. There is a method (Patent Document 2) in which light is emitted from the front surface by providing a convex or concave reflection line on the back surface.
However, the method of printing a pattern having a diffusing action on a molding plate requires a processing step after molding, and further, in order to obtain uniform light emission at the incident part of a light source such as an LED and the part far from the light source, the pattern size and It is necessary to take measures such as gradually changing the density from the light source side to the part far from the light source. Further, the method of providing the reflection line of the convex portion or the concave portion requires a precise mold, and there is a problem that the expected effect cannot be obtained if the transferability of the mold is not sufficient at the time of molding.

Further, although the polycarbonate resin composition having a light diffusing property is described in Patent Documents 3-4 and the like, the light transmittances of the obtained molded products are all low and were not suitable for this kind of use. .. Further, although Patent Document 5 describes a light guide plate formed by mixing oxide fine particles with a transparent resin such as polymethylmethacrylate, it has a drawback that the light transmittance is likely to decrease and it is difficult to obtain sufficient surface emission. Further, there is known a light guide plate in which a transparent resin such as a polycarbonate resin and a small amount of a light diffusing agent such as acrylic beads and aluminum oxide are mixed, but these were intended to merely obtain uniform light emission.

In recent years, it has a surface emitting function for improving design and imparting functionality and novelty in a variety of fields including playground equipment (such as pachinko machines) in entertainment facilities, toys, laptop computers, mobile phones and other mobile devices. Materials are being adopted. At that time, in fields such as playground equipment, toys, notebook computers, mobile devices such as mobile phones that require high design, playfulness and taste, it is not just uniform light emission like ordinary liquid crystal displays and lighting equipment. Innovative, fashionable, and more beautifully luminous, which inspires customers to buy.

JP-A-5-17630 Japanese Patent Laid-Open No. 5-94802 JP-A-3-143950 JP-A-6-32973 JP-A-5-341284

An object (problem) of the present invention is that a vertical surface with respect to a light incident direction is visually transparent when not lit, and when a light is incident and lit by an edge light method, the vertical surface in the incident direction is It is an object of the present invention to provide a surface-emitting transparent resin composition and a molded product thereof which emits surface light and emits not only uniform light emission but also a glittering brilliance like stars in the night sky.

The present inventor has conducted extensive studies to solve the above problems, and a thermoplastic resin composition containing specific particles in a specific amount is transparent when viewed from the thickness direction during non-lighting and lighting. The present inventors have found that, in some cases, a plane perpendicular to the light source incident direction emits light with high luminance, and a glittering brilliance can be obtained, and has reached the present invention.
The present invention relates to the following thermoplastic resin composition and molded articles thereof.

[1] Spherical particles having a hollow structure having an average particle diameter of 12 to 40 μm, a hollow portion diameter of 10 μm or more, and a hollow portion volume ratio of 50% or more with respect to 100 parts by mass of the transparent thermoplastic resin (A). A thermoplastic resin composition comprising 0.001 to 0.09 parts by mass of (B).
[2] The thermoplastic resin composition according to the above [1], wherein the spherical particles (B) have a compressive fracture strength of 10 MPa or more.
[3] The thermoplastic resin composition according to the above [1] or [2], wherein the transparent thermoplastic resin (A) is a polycarbonate resin or an acrylic resin.
[4] A molded product comprising the thermoplastic resin composition according to any one of the above [1] to [3].
[5] The molded product according to the above [4], which has a haze of 0.5 to 30% when measured at 3 mmt.
[6] For edge-light type light emission, characterized in that the number of bright spots having a size of 10 μm or more is 100/cm ² or more when light enters from a light source arranged along the side surface of the molded body. The molded product according to the above [4].
[7] The molded product according to any one of the above [4] to [6], wherein the molded product is a light guide plate for edge light type light emission.

The thermoplastic resin composition of the present invention is transparent when viewed from the thickness direction when not lit, and when lit, the surface vertical to the light source incident direction emits light with high brightness, and a surface that develops a glittering sparkle. It is possible to provide a light emitting molded body or the like.

7 is a photograph showing the state of surface emission of the molded articles obtained in Example 2, Comparative Example 1 and Comparative Example 5 upon light irradiation.

Hereinafter, the present invention will be described in detail with reference to embodiments and exemplifications, but the present invention should not be construed as being limited to the embodiments and exemplifications shown below.
In addition, in this specification, unless otherwise specified, the term "to" is used to mean that the numerical values before and after the "to" are included as the lower limit value and the upper limit value.

The thermoplastic resin composition of the present invention has an average particle diameter of 12 to 40 μm, a hollow portion diameter of 10 μm or more, and a hollow portion volume ratio of 50% or more with respect to 100 parts by mass of the transparent thermoplastic resin (A). It is characterized by containing 0.001 to 0.09 parts by mass of spherical particles (B) having a certain hollow structure.

[Transparent thermoplastic resin (A)]
The transparent thermoplastic resin used in the thermoplastic resin composition of the present invention is not particularly limited, and examples thereof include polycarbonate resin; acrylic resin such as polymethylmethacrylate resin; amorphous polyester resin such as polyethylene terephthalate (PET) resin; polystyrene-based resin. Resin: A thermoplastic resin such as a cyclic polyolefin resin, or a polymer alloy composed of two or more kinds of these thermoplastic resins can be mentioned.
Among them, from the viewpoint of transparency, it is preferable to use a polycarbonate resin or an acrylic resin, and a polycarbonate resin is particularly preferable.

[Polycarbonate resin]
The polycarbonate resin used in the thermoplastic resin composition of the present invention is not limited in its type.
The polycarbonate resin is a polymer having a basic structure having a carbonic acid bond, which is represented by the general formula: -[-O-X-O-C(=O)-]-. In the formula, X is generally a hydrocarbon group, but X having a hetero atom or a hetero bond may be used to impart various characteristics.
Further, the polycarbonate resin can be classified into an aromatic polycarbonate resin in which carbons directly bonded to a carbonic acid bond are aromatic carbons and an aliphatic polycarbonate resin in which carbons are aliphatic carbons, and any of them can be used. Of these, aromatic polycarbonate resins are preferable from the viewpoint of heat resistance, mechanical properties, electrical characteristics, and the like.

The polycarbonate resin is not particularly limited in type, but examples thereof include a polycarbonate polymer obtained by reacting a dihydroxy compound with a carbonate precursor. At this time, a polyhydroxy compound or the like may be reacted in addition to the dihydroxy compound and the carbonate precursor. Alternatively, a method of reacting carbon dioxide as a carbonate precursor with a cyclic ether may be used. The polycarbonate polymer may be linear or branched. Further, the polycarbonate polymer may be a homopolymer composed of one type of repeating unit or a copolymer having two or more types of repeating units. At this time, as the copolymer, various copolymerization forms such as a random copolymer and a block copolymer can be selected. In addition, such a polycarbonate polymer is usually a thermoplastic resin.

Among the monomers as the raw material of the aromatic polycarbonate resin, examples of the aromatic dihydroxy compound include:
Dihydroxybenzenes such as 1,2-dihydroxybenzene, 1,3-dihydroxybenzene (that is, resorcinol) and 1,4-dihydroxybenzene;
Dihydroxybiphenyls such as 2,5-dihydroxybiphenyl, 2,2′-dihydroxybiphenyl, 4,4′-dihydroxybiphenyl;
2,2'-dihydroxy-1,1'-binaphthyl, 1,2-dihydroxynaphthalene, 1,3-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, 1,6-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, 1 Dihydroxynaphthalenes such as 7,7-dihydroxynaphthalene and 2,7-dihydroxynaphthalene;
2,2'-dihydroxydiphenyl ether, 3,3'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether, 1,4-bis(3-hydroxyphenoxy) Dihydroxydiaryl ethers such as benzene and 1,3-bis(4-hydroxyphenoxy)benzene;

2,2-bis(4-hydroxyphenyl)propane (ie, bisphenol A),
1,1-bis(4-hydroxyphenyl)propane,
2,2-bis(3-methyl-4-hydroxyphenyl)propane,
2,2-bis(3-methoxy-4-hydroxyphenyl)propane,
2-(4-hydroxyphenyl)-2-(3-methoxy-4-hydroxyphenyl)propane,
1,1-bis(3-tert-butyl-4-hydroxyphenyl)propane,
2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane,
2,2-bis(3-cyclohexyl-4-hydroxyphenyl)propane,
2-(4-hydroxyphenyl)-2-(3-cyclohexyl-4-hydroxyphenyl)propane,
α,α′-bis(4-hydroxyphenyl)-1,4-diisopropylbenzene,
1,3-bis[2-(4-hydroxyphenyl)-2-propyl]benzene,
Bis(4-hydroxyphenyl)methane,
Bis(4-hydroxyphenyl)cyclohexylmethane,
Bis(4-hydroxyphenyl)phenylmethane,
Bis(4-hydroxyphenyl)(4-propenylphenyl)methane,
Bis(4-hydroxyphenyl)diphenylmethane,
Bis(4-hydroxyphenyl)naphthylmethane,
1,1-bis(4-hydroxyphenyl)ethane,
1,1-bis(4-hydroxyphenyl)-1-phenylethane,
1,1-bis(4-hydroxyphenyl)-1-naphthylethane,
1,1-bis(4-hydroxyphenyl)butane,
2,2-bis(4-hydroxyphenyl)butane,
2,2-bis(4-hydroxyphenyl)pentane,
1,1-bis(4-hydroxyphenyl)hexane,
2,2-bis(4-hydroxyphenyl)hexane,
1,1-bis(4-hydroxyphenyl)octane,
2,2-bis(4-hydroxyphenyl)octane,
1,1-bis(4-hydroxyphenyl)hexane,
2,2-bis(4-hydroxyphenyl)hexane,
4,4-bis(4-hydroxyphenyl)heptane,
2,2-bis(4-hydroxyphenyl)nonane,
1,1-bis(4-hydroxyphenyl)decane,
1,1-bis(4-hydroxyphenyl)dodecane,
Bis(hydroxyaryl)alkanes such as;

1,1-bis(4-hydroxyphenyl)cyclopentane,
1,1-bis(4-hydroxyphenyl)cyclohexane,
1,1-bis(4-hydroxyphenyl)-3,3-dimethylcyclohexane,
1,1-bis(4-hydroxyphenyl)-3,4-dimethylcyclohexane,
1,1-bis(4-hydroxyphenyl)-3,5-dimethylcyclohexane,
1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane,
1,1-bis(4-hydroxy-3,5-dimethylphenyl)-3,3,5-trimethylcyclohexane,
1,1-bis(4-hydroxyphenyl)-3-propyl-5-methylcyclohexane,
1,1-bis(4-hydroxyphenyl)-3-tert-butyl-cyclohexane,
1,1-bis(4-hydroxyphenyl)-3-phenylcyclohexane,
1,1-bis(4-hydroxyphenyl)-4-phenylcyclohexane,
Bis(hydroxyaryl)cycloalkanes such as;

9,9-bis(4-hydroxyphenyl)fluorene,
Cardo structure-containing bisphenols such as 9,9-bis(4-hydroxy-3-methylphenyl)fluorene;
4,4'-dihydroxydiphenyl sulfide,
Dihydroxydiaryl sulfides such as 4,4′-dihydroxy-3,3′-dimethyldiphenyl sulfide;
4,4'-dihydroxydiphenyl sulfoxide,
Dihydroxydiaryl sulfoxides such as 4,4′-dihydroxy-3,3′-dimethyldiphenyl sulfoxide;
4,4'-dihydroxydiphenyl sulfone,
Dihydroxydiarylsulfones such as 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfone;
Etc.

Among these, bis(hydroxyaryl)alkanes are preferable, and bis(4-hydroxyphenyl)alkanes are particularly preferable. 2,2-bis(4-hydroxyphenyl)propane, that is, from the viewpoint of impact resistance and heat resistance, , Bisphenol A is preferred.
The aromatic dihydroxy compounds may be used alone or in any combination of two or more at any ratio.

Further, to give an example of a monomer that is a raw material of the aliphatic polycarbonate resin,
Ethane-1,2-diol, propane-1,2-diol, propane-1,3-diol, 2,2-dimethylpropane-1,3-diol, 2-methyl-2-propylpropane-1,3- Alkanediols such as diol, butane-1,4-diol, pentane-1,5-diol, hexane-1,6-diol, decane-1,10-diol;

Cyclopentane-1,2-diol, cyclohexane-1,2-diol, cyclohexane-1,4-diol, 1,4-cyclohexanedimethanol, 4-(2-hydroxyethyl)cyclohexanol, 2,2,4. Cycloalkanediols such as 4-tetramethyl-cyclobutane-1,3-diol;

Glycols such as ethylene glycol, 2,2'-oxydiethanol (that is, diethylene glycol), triethylene glycol, propylene glycol, spiroglycol;

1,2-benzenedimethanol, 1,3-benzenedimethanol, 1,4-benzenedimethanol, 1,4-benzenediethanol, 1,3-bis(2-hydroxyethoxy)benzene, 1,4-bis( 2-hydroxyethoxy)benzene, 2,3-bis(hydroxymethyl)naphthalene, 1,6-bis(hydroxyethoxy)naphthalene, 4,4′-biphenyldimethanol, 4,4′-biphenyldiethanol, 1,4- Aralkyldiols such as bis(2-hydroxyethoxy)biphenyl, bisphenol A bis(2-hydroxyethyl)ether, bisphenol S bis(2-hydroxyethyl)ether;

1,2-epoxyethane (ie ethylene oxide), 1,2-epoxypropane (ie propylene oxide), 1,2-epoxycyclopentane, 1,2-epoxycyclohexane, 1,4-epoxycyclohexane, 1-methyl Cyclic ethers such as -1,2-epoxycyclohexane, 2,3-epoxynorbornane and 1,3-epoxypropane; and the like.

Among the monomers as the raw material of the aromatic polycarbonate resin, examples of the carbonate precursor include carbonyl halide and carbonate ester. In addition, 1 type may be used for a carbonate precursor and 2 or more types may be used together by arbitrary combinations and ratios.

Specific examples of the carbonyl halide include phosgene; haloformates such as bischloroformate of dihydroxy compound and monochloroformate of dihydroxy compound.

Specific examples of the carbonate ester include diaryl carbonates such as diphenyl carbonate and ditolyl carbonate; dialkyl carbonates such as dimethyl carbonate and diethyl carbonate; biscarbonates of dihydroxy compounds, monocarbonates of dihydroxy compounds, cyclic carbonates. Examples thereof include carbonates of dihydroxy compounds.

<Method for producing polycarbonate resin>
The method for producing the polycarbonate resin is not particularly limited, and any method can be adopted. Examples thereof include an interfacial polymerization method, a melt transesterification method, a pyridine method, a ring-opening polymerization method of a cyclic carbonate compound, and a solid-state transesterification method of a prepolymer. Hereinafter, particularly preferable ones of these methods will be specifically described.

<Interfacial polymerization method>
First, the case of producing a polycarbonate resin by an interfacial polymerization method will be described.
In the interfacial polymerization method, the pH is usually maintained at 9 or more in the presence of an organic solvent and an alkaline aqueous solution which are inert to the reaction, the dihydroxy compound and the carbonate precursor (preferably phosgene) are reacted, and then the polymerization catalyst A polycarbonate resin is obtained by performing interfacial polymerization in the presence. If necessary, a molecular weight modifier (end terminator) may be added to the reaction system, or an antioxidant may be added to prevent oxidation of the dihydroxy compound.

The dihydroxy compound and the carbonate-forming compound which are raw materials of the polycarbonate resin are as described above. It is preferable to use phosgene among the carbonate-forming compounds, and the method using phosgene is particularly called the phosgene method.
Examples of the organic solvent inert to the reaction include chlorinated hydrocarbons such as dichloromethane, 1,2-dichloroethane, chloroform, monochlorobenzene and dichlorobenzene; aromatic hydrocarbons such as benzene, toluene and xylene; and the like. To be In addition, as the organic solvent, one kind may be used, and two kinds or more may be used in optional combination and ratio.

Examples of the alkaline compound contained in the alkaline aqueous solution include sodium hydroxide, potassium hydroxide, lithium hydroxide, alkaline metal compounds such as sodium hydrogen carbonate, and alkaline earth metal compounds. Among them, sodium hydroxide and Potassium hydroxide is preferred. The alkaline compounds may be used alone or in any combination of two or more at any ratio.

There is no limitation on the concentration of the alkaline compound in the alkaline aqueous solution, but it is usually used at 5 to 10% by mass in order to control the pH of the alkaline aqueous solution in the reaction to 10 to 12. Further, for example, when blowing phosgene, in order to control the pH of the aqueous phase to be 10 to 12, preferably 10 to 11, the molar ratio of the dihydroxy compound to the alkali compound is usually 1:1.9 or more. It is preferable that the ratio is 1:2.0 or more, usually 1:3.2 or less, and particularly 1:2.5 or less.

Examples of the polymerization catalyst include aliphatic tertiary amines such as trimethylamine, triethylamine, tributylamine, tripropylamine and trihexylamine; alicyclic rings such as N,N′-dimethylcyclohexylamine and N,N′-diethylcyclohexylamine. Formula tertiary amine; aromatic tertiary amine such as N,N'-dimethylaniline, N,N'-diethylaniline; quaternary ammonium salt such as trimethylbenzylammonium chloride, tetramethylammonium chloride, triethylbenzylammonium chloride, etc. Pyridine; guanine; guanidine salt; and the like. The polymerization catalyst may be used alone or in any combination of two or more in any ratio.

Examples of the molecular weight modifier include aromatic phenols having a monovalent phenolic hydroxyl group; aliphatic alcohols such as methanol and butanol; mercaptans; phthalic acid imides and the like. Among them, aromatic phenols are preferable. Specific examples of such an aromatic phenol include alkyl groups such as m-methylphenol, p-methylphenol, m-propylphenol, p-propylphenol, p-tert-butylphenol, and p-long-chain alkyl-substituted phenol. Substituted phenols; vinyl group-containing phenols such as isopropanylphenol; epoxy group-containing phenols; carboxyl group-containing phenols such as 0-oxinebenzoic acid and 2-methyl-6-hydroxyphenylacetic acid; The molecular weight modifier may be used alone or in any combination of two or more in any ratio.

The amount of the molecular weight modifier used is usually 0.5 mol or more, preferably 1 mol or more, and usually 50 mol or less, preferably 30 mol or less, with respect to 100 mol of the dihydroxy compound as a raw material. When the amount of the molecular weight modifier used is within this range, it is possible to improve thermal stability and hydrolysis resistance when the obtained polycarbonate resin is used in a thermoplastic resin composition.

In the polymerization reaction, the reaction substrate (raw material), the reaction solvent, the catalyst, the additive and the like may be mixed in any order as long as the desired polycarbonate resin can be obtained, and an appropriate order may be set. For example, when phosgene is used as the carbonate-forming compound, the molecular weight modifier can be mixed at any time between the reaction of the dihydroxy compound and phosgene (phosgenation) and the start of the polymerization reaction.
The reaction temperature is usually 0 to 40° C., and the reaction time is usually several minutes (for example, 10 minutes) to several hours (for example, 6 hours).

<Melted transesterification method>
Next, the case of producing a polycarbonate resin by the melt transesterification method will be described.
In the melt transesterification method, for example, a transesterification reaction between a carbonic acid diester and a dihydroxy compound is performed.
As the dihydroxy compound and the carbonate ester, those mentioned above are used, but as the carbonate ester to be used, diphenyl carbonate and substituted diphenyl carbonate are preferable, and diphenyl carbonate is particularly preferable. One kind of carbonate ester may be used, or two or more kinds thereof may be used in optional combination and ratio.
The ratio of the dihydroxy compound and the carbonate ester is arbitrary as long as a desired polycarbonate resin can be obtained, but it is preferable to use the carbonate ester in an equimolar amount or more, particularly 1.01 mol or more, relative to 1 mol of the dihydroxy compound. Is more preferable. The upper limit is usually 1.30 mol or less. With such a range, the amount of terminal hydroxyl groups can be adjusted to a suitable range.

In a polycarbonate resin, the amount of terminal hydroxyl groups tends to have a great influence on thermal stability, hydrolysis stability, color tone and the like. Therefore, the amount of terminal hydroxyl groups may be adjusted as necessary by any known method. In the transesterification reaction, usually, a polycarbonate resin having an adjusted amount of terminal hydroxyl groups can be obtained by adjusting the mixing ratio of the carbonate ester and the dihydroxy compound; the degree of pressure reduction during the transesterification reaction. By this operation, the molecular weight of the polycarbonate resin usually obtained can also be adjusted.

When adjusting the mixing ratio of a carbonate ester and a dihydroxy compound and adjusting the amount of terminal hydroxyl groups, the mixing ratio is as above-mentioned.
Further, as a more positive adjustment method, a method of separately mixing a terminal stopper during the reaction can be mentioned. Examples of the terminal terminator at this time include monohydric phenols, monohydric carboxylic acids, and carbonate esters. In addition, 1 type may be used for a terminal terminator and 2 or more types may be used together by arbitrary combinations and ratios.

When producing a polycarbonate resin by the melt transesterification method, a transesterification catalyst is usually used. Any transesterification catalyst can be used. Above all, it is preferable to use, for example, an alkali metal compound and/or an alkaline earth metal compound. In addition, a basic compound such as a basic boron compound, a basic phosphorus compound, a basic ammonium compound, or an amine compound may be used in combination as a supplement. The transesterification catalyst may be used alone or in any combination of two or more at any ratio.

In the melt transesterification method, the reaction temperature is usually 100 to 320°C. The pressure during the reaction is usually a reduced pressure condition of 2 mmHg or less. As a specific operation, the melt polycondensation reaction may be carried out under the above conditions while removing by-products such as aromatic hydroxy compounds.
The melt polycondensation reaction can be performed by either a batch method or a continuous method. When performing in a batch system, the order of mixing the reaction substrate (raw material), the reaction solvent, the catalyst, the additive, etc. is arbitrary as long as the desired polycarbonate resin can be obtained, and an appropriate order may be set arbitrarily. However, it is preferable to carry out the melt polycondensation reaction in a continuous manner, taking into consideration the stability of the polycarbonate resin and the resin composition.

In the melt transesterification method, a catalyst deactivator may be used if necessary. As the catalyst deactivator, any compound that neutralizes the transesterification catalyst can be used. Examples thereof include sulfur-containing acidic compounds and their derivatives. The catalyst deactivator may be used alone or in any combination of two or more at any ratio.
The amount of the catalyst deactivator used is usually 0.5 equivalent or more, preferably 1 equivalent or more, and usually 10 equivalents or less with respect to the alkali metal or alkaline earth metal contained in the transesterification catalyst. It is preferably 5 equivalents or less. Further, it is usually 1 ppm or more, and usually 100 ppm or less, and preferably 50 ppm or less with respect to the polycarbonate resin.

It is also preferable that the polycarbonate resin contains a polycarbonate resin having a structural viscosity index N within a predetermined range in a certain proportion or more.
The structural viscosity index N is an index for evaluating the flow characteristics of the melt. Usually, the melting property of a polycarbonate resin can be expressed by the mathematical formula: γ=a·σ ^N.
In the formula, γ: shear rate, a: constant, σ: stress, N: structural viscosity index.

In the above formula, when N=1, the Newtonian fluidity is shown, and as the value of N becomes larger, the non-Newtonian fluidity becomes larger. That is, the flow characteristics of the melt are evaluated by the magnitude of the structural viscosity index N. Generally, a polycarbonate resin having a large structural viscosity index N tends to have a high melt viscosity in a low shear region. Therefore, when a polycarbonate resin having a large structural viscosity index N is mixed with another polycarbonate resin, it is possible to suppress the dropping of the obtained resin composition at the time of burning and improve the flame retardancy.

When a polycarbonate resin having a structural viscosity index N in a predetermined range is contained in a certain proportion or more, the structural viscosity index N is preferably 1.2 or more, more preferably 1.25 or more, further preferably 1.28 or more, and , Preferably 1.8 or less, more preferably 1.7 or less polycarbonate resin is contained at a certain ratio or more. By containing the polycarbonate resin having a high structural viscosity index N in this way, it is possible to suppress the dropping of the resin composition of the present invention during combustion and improve the flame retardancy. Further, by setting the structural viscosity index N to be equal to or less than the upper limit value of the above range, the moldability of the resin composition of the present invention can be maintained in a favorable range.

The structural viscosity index N may be displayed by Log η _a =[(1−N)/N]×Log γ+C, which is derived from the above formula, as described in, for example, JP-A-2005-232442. It is possible. In the above formula, N: structural viscosity index, γ: shear rate, C: constant, η _a : apparent viscosity. As can be seen from this equation, the N value can also be evaluated from γ and η _a in the low shear region where the viscosity behavior is greatly different. For example, the N value can be determined from η _a at γ=12.16 sec ⁻¹ and γ=24.32 sec ⁻¹ .

When the polycarbonate resin used in the resin composition of the present invention contains a polycarbonate resin having the above-mentioned structural viscosity index N in a predetermined range, the polycarbonate resin preferably contains 20% by mass or more, and 30% by mass or more. More preferably, it is more preferably 50% by mass or more. The upper limit is not limited and is usually 100% by mass or less, preferably 90% by mass or less, and more preferably 85% by mass or less.

In order to produce a polycarbonate resin having a structural viscosity index N in a predetermined range, a polycarbonate resin having a structural viscosity index N in a predetermined range can be obtained by producing the polycarbonate resin according to the method for producing a polycarbonate resin described above. Is preferable because it is easy to obtain a polycarbonate resin having a structural viscosity index N within a predetermined range by manufacturing a polycarbonate resin having a branched structure (hereinafter, appropriately referred to as “branched polycarbonate resin”). This is because the branched polycarbonate resin tends to have a high structural viscosity index N.

Examples of the method for producing a branched polycarbonate resin include the methods described in JP-A-8-259687 and JP-A-8-245782. In the methods described in these documents, when the dihydroxy compound and the diester of carbonic acid are reacted by the melt transesterification method, by selecting the conditions of the catalyst or the production conditions, the structural viscosity index can be obtained without using a branching agent. It is possible to obtain an aromatic polycarbonate resin which is high and has excellent hydrolysis stability.

As another method for producing a branched polycarbonate resin, a trifunctional or higher polyfunctional compound (branching agent) is used in addition to the dihydroxy compound and the carbonate-forming compound, which are the raw materials of the above-mentioned polycarbonate resin, and Examples thereof include a method of copolymerizing these by a legal method or a melt transesterification method.
Examples of trifunctional or higher polyfunctional compounds include 1,3,5-trihydroxybenzene (phloroglucin) and 4,6-dimethyl-2,4,6-tri(4-hydroxyphenyl)heptene-2,4. ,6-Dimethyl-2,4,6-tri(4-hydroxyphenyl)heptane, 2,6-dimethyl-2,4,6-tri(4-hydroxyphenyl)heptene-3,1,3,5-tri Polyhydroxy compounds such as (4-hydroxyphenyl)benzene, 1,1,1-tri(4-hydroxyphenyl)ethane; 3,3-bis(4-hydroxyaryl)oxyindole (ie, isatin) Bisphenol), 5-chloroisatin, 5,7-dichloroisatin, 5-bromoisatin and the like. Of these, 1,1,1-tri(4-hydroxyphenyl)ethane is preferred.

The polyfunctional compound can be used by substituting a part of the dihydroxy compound. The amount of the polyfunctional aromatic compound used is usually 0.01 mol% or more, preferably 0.1 mol% or more, and usually 10 mol% or less, preferably 3 mol, based on the total dihydroxy compounds as the raw materials. It is not more than mol %.
The polyfunctional compounds may be used alone or in any combination of two or more at any ratio.

As the method for producing the branched polycarbonate resin, among the above-mentioned methods, the production method for producing the branched polycarbonate resin by the above-mentioned melt transesterification method is particularly preferable. This is because it can be produced with a raw material that is relatively inexpensive and easily industrially available. Therefore, the polycarbonate resin is also preferably produced by the melt transesterification method.
As the polycarbonate resin having a structural viscosity index N within a predetermined range, a single resin may be used, or two or more different resins may be used in any combination and ratio.

<Other matters concerning polycarbonate resin>
The molecular weight of the polycarbonate resin is arbitrary and may be appropriately selected and determined. The viscosity average molecular weight [Mv] is usually 10,000 or more, preferably 14,000 or more, more preferably 16,000 or more, and usually 40,000 or less, It is preferably 30,000 or less. By setting the viscosity average molecular weight to be at least the lower limit value of the above range, the mechanical strength of the resin composition can be further improved, and it is more preferable when it is used in an application requiring high mechanical strength. On the other hand, by setting the viscosity average molecular weight to be not more than the upper limit value of the above range, the fluidity of the resin composition can be suppressed and improved, and the molding processability can be improved to facilitate the molding process.
It should be noted that two or more types of polycarbonate resins having different viscosity average molecular weights may be mixed and used, and in this case, polycarbonate resins having a viscosity average molecular weight outside the preferred range may be mixed.

It is also preferable that the polycarbonate resin contains a high molecular weight polycarbonate resin, for example, a polycarbonate resin having a viscosity average molecular weight [Mv] of preferably 50,000 to 95,000. The viscosity average molecular weight of the high molecular weight polycarbonate resin is more preferably 55,000 or more, still more preferably 60,000 or more, especially 61,000 or more, particularly 62,000 or more, and more preferably 90,000 or less, further preferably 85,000 or less, among others. It is preferably 80,000 or less, particularly 75,000 or less, and particularly preferably 70,000 or less.

When a high-molecular weight polycarbonate resin is included, it is preferably contained in the polycarbonate resin in an amount of 5% by mass or more, more preferably 10% by mass or more, and further preferably 15% by mass or more. The upper limit is preferably 40% by mass or less, more preferably 30% by mass or less.

In the present invention, the viscosity average molecular weight [Mv] of the polycarbonate resin is methylene chloride as a solvent, and the intrinsic viscosity [η] (unit: dl/g) at a temperature of 25° C. is calculated using an Ubbelohde viscometer. It means a value calculated from the Schnell's viscosity formula, that is, η=1.23×10 ⁻⁴ Mv ^0.83 . The intrinsic viscosity [η] is a value calculated from the following formula by measuring the specific viscosity [η _sp ] at each solution concentration [C] (g/dl).

The terminal hydroxyl group concentration of the polycarbonate resin is arbitrary and may be appropriately selected and determined, but is usually 1000 ppm or less, preferably 1500 ppm or less, more preferably 1000 ppm or less. This makes it possible to further improve the retention heat stability and color tone of the resin composition of the present invention. In addition, the lower limit is usually 10 ppm or more, preferably 30 ppm or more, and more preferably 40 ppm or more, especially for the polycarbonate resin produced by the melt transesterification method. This makes it possible to suppress a decrease in the molecular weight and further improve the mechanical properties of the resin composition of the present invention.

The unit of the terminal hydroxyl group concentration is the mass of the terminal hydroxyl group expressed in ppm with respect to the mass of the polycarbonate resin. The measuring method is a colorimetric determination by the titanium tetrachloride/acetic acid method (method described in Macromol. Chem. 88 215 (1965)).
Further, the polycarbonate resin may contain a polycarbonate oligomer in order to improve the appearance and fluidity of the molded product. The viscosity average molecular weight [Mv] of this polycarbonate oligomer is usually 1500 or more, preferably 2000 or more, and usually 9500 or less, preferably 9000 or less. Further, the content of the polycarbonate ligomer is preferably 30% by mass or less of the polycarbonate resin (including the polycarbonate oligomer).

[acrylic resin]
The acrylic resin is preferably a methyl methacrylate-based resin, and it is preferable that the monomer amount of the constituent unit of methyl methacrylate is 80 mol% or more, preferably 90 mol% or more with respect to the total monomer amount of all the constituent units. The acrylic resin is also preferably a copolymer of methyl methacrylate and other methyl acrylate, ethyl acrylate, butyl acrylate, or the like.

The acrylic resin preferably has a mass average molecular weight of 20,000 to 200,000, and more preferably 50,000 to 150,000.
The mass average molecular weight of the acrylic resin is a value measured by gel permeation chromatography using standard polystyrene as a standard sample.

The method for producing an acrylic resin is generally roughly classified into an emulsion polymerization method, a suspension polymerization method and a continuous polymerization method. The acrylic resin used in the present invention is preferably an acrylic resin produced by the continuous polymerization method. Further, the continuous production method can be divided into a continuous bulk polymerization method and a continuous solution polymerization method, but in the present invention, an acrylic resin obtained by any of the production methods can be used.

The acrylic resins may be used alone or in combination of two or more.

As described above, as the transparent thermoplastic resin (A), a polycarbonate resin and/or an acrylic resin is preferable, but when the other thermoplastic resin other than the polycarbonate resin and the acrylic resin is contained, the content thereof is The amount is preferably 20 parts by mass or less, more preferably 10 parts by mass or less, further preferably 5 parts by mass or less, and particularly preferably 3 parts by mass or less, relative to 100 parts by mass of the polycarbonate resin and the acrylic resin.

[Spherical particles having a hollow structure (B)]
The thermoplastic resin composition of the present invention contains spherical particles (B) having a hollow structure. Then, the spherical particles (B) having a hollow structure in which the average particle diameter is 12 to 40 μm, the diameter of the hollow portion is 10 μm or more, and the volume ratio of the hollow portion is 50% or more, the transparent thermoplastic resin (A) 100 mass It is contained in an amount of 0.001 to 0.09 parts by mass with respect to parts.

Conventionally, there have been surface light emitters such as light guide plates in which diffusion particles such as titanium oxide are mixed in a thermoplastic resin, and they show transparency when not normally lit, but when an LED light etc. is made incident by the edge light method, it becomes a vertical surface. It is known that light emits light in a light and uniform manner. Usually, in these surface light emitters, the particle size of the diffusing fine particles is less than 10 μm, which is relatively small with respect to the wavelength of light. Therefore, the scattering mechanism of incident light is uniform Mie scattering, and the hue increases as the distance from the light source increases. It changes and becomes yellowish.
On the other hand, the spherical particles (B) having a large particle size and a space inside as described above are hollow spherical particles in which the internal space is air (or air in a reduced pressure state), and the resin of the present invention containing the same. In the molded body of the composition, the mechanism of scattering is mainly geometrical optics approximation (refraction), the difference in refractive index between the polycarbonate resin having a refractive index of 1.59 and the internal space having a refractive index of 1 is large, and spherical particles Since (B) is present only in a small amount as described above, it emits a non-uniform glittering surface emission at high brightness and has a low brightness attenuation rate, and the brightness is attenuated from the edge light to the opposite end. Is expected to decrease.

FIG. 1 is a photograph showing the state of surface emission of the molded articles obtained in Example 2 and Comparative Examples 1 and 5 during light irradiation. At the right end in FIG. 1, is a molded article of Comparative Example 5 in which a hollow acrylic light diffusing agent having an average particle diameter of 5 μm (hollow volume ratio: 15%) is blended, and emits light uniformly. Further, it can be seen that the brightness is low in the part away from the LED light source. Further, in the center of FIG. 1, there is a molded product of Comparative Example 1 in which glass beads having an average particle size of 20 μm (hollow volume ratio: 0%) are mixed, and it can be seen that the brightness is not increased.
On the other hand, on the left side of FIG. 1 is the molded product of Example 2 in which hollow glass beads having an average particle diameter of 16 μm (hollow volume ratio: 85%) were blended, which had high brightness and non-uniform bright spots. Thus, it is found that the surface light is emitted brilliantly and there is little attenuation of the brightness from the edge light of the LED light to the opposite end.

As described above, the spherical particles (B) have a large average particle diameter of 12 to 40 μm, preferably 13 μm or more, more preferably 14 μm or more, still more preferably 15 μm or more, and preferably 37 μm or less. It is preferably 35 μm or less, more preferably 33 μm or less, especially 30 μm or less, especially 28 μm or less, particularly 26 μm or less, and most preferably 25 μm or less.
Here, the average particle diameter is a median value (D ₅₀ ) measured by a laser diffraction scattering method.

The spherical shape of the spherical particles (B) may be a true spherical shape, an elliptical shape, or a substantially spherical shape including an oval shape. Specifically, the aspect ratio (long diameter and short diameter) is used. The diameter ratio) is usually 1.3 or less, preferably 1.2 or less, more preferably 1.1 or less.

The hollow spherical particles (B) are characterized in that the diameter (inner diameter) of the hollow portion is 10 μm or more, the volume ratio of the hollow portion is 50% or more, and the internal space of air (or depressurized state) is large. To do.
The diameter (inner diameter) of the hollow portion is preferably 11 μm or more, more preferably 12 μm or more, further preferably 13 μm or more, preferably 37 μm or less, more preferably 35 μm or less, still more preferably 33 μm or less, especially 30 μm or less, It is particularly preferably 28 μm or less, more preferably 26 μm or less, and most preferably 25 μm or less.

Further, the volume ratio of the hollow portion is preferably 60% or more, more preferably 65% or more, still more preferably 70% or more, and especially 75% or more, especially 100% of the total volume of the spherical particles (B). It is preferably 80% or more, preferably 98% or less, more preferably 95% or less, still more preferably 93% or less, and particularly preferably 90% or less.

The outer shell portion of the spherical particles (B) is preferably thinner, because the volume of the hollow portion can be increased to obtain high brightness, and is preferably 3 μm or less, more preferably 2 μm or less, and further preferably 1. It is 5 μm or less, preferably 0.4 μm or more, and more preferably 0.5 μm or more.

The compressive fracture strength of the spherical particles (B) is not particularly limited, but is usually 10 MPa or higher, preferably 30 MPa or higher, more preferably 50 MPa or higher, even more preferably 70 MPa or higher, even more preferably 90 MPa or higher, particularly preferably 110 MPa or higher. .. Within the above range, during melt-kneading, crushing of particles during molding is suppressed, and the particles are contained and dispersed in the resin in the shape before compounding, so that a large number of particles have high surface emission brightness. Is easily expressed, which is preferable. On the other hand, the upper limit of the compressive fracture strength is not particularly limited, but is usually 500 MPa or less.

Here, the compressive fracture strength of the spherical particles (B) in the present invention is a value calculated by measuring under the following conditions based on JIS-Z8844:2019 "Method for measuring fracture strength and deformation strength of fine particles". ..
-Tester: A compression tester for fine particles. As a device, a micro compression tester MCT-510 manufactured by Shimadzu Corporation can be exemplified.
・Atmosphere condition during compression test: 23°C±2°C, 50±15%RH
・Compression test load speed: 1.1155 mN/sec
・Upper pressure indenter: Flat surface 50μmφ
-Lower pressure plate (sample scatter table): Plane shape-Compression test is performed by randomly selecting 7 particles, and compression test is performed on each particle.
The breaking strength is determined and the average value is taken as the compressive breaking strength of the particles.
-The compressive fracture strength is calculated by the following calculation formula (A).
Calculation formula (A) σ=2.8×F/d ² ×10 ^3.
σ: compressive fracture strength (MPa) F: fracture force (mN) when fracture of the sample is observed
d: Average particle size of measured particles (μm)

The content of the spherical particles (B) is 0.001 to 0.09 parts by mass with respect to 100 parts by mass of the transparent thermoplastic resin (A). If the content is less than 0.001 part by mass, the surface emission brightness is insufficient, and the surface emission characteristic of the present invention does not occur. The surface emission brightness of the distant portion is reduced, and the surface emission characteristic of the present invention is unlikely to occur.

The spherical particles (B) are not particularly limited, and include inorganic hollow particles, silicone hollow particles containing a silicone compound such as a silsesquioxane polymer as a main component, and a thermoplastic or thermosetting resin such as an acrylic resin. Hollow particles and the like can be used.

The hollow particles (B) do not necessarily have to be completely transparent, but preferably have excellent transparency, and the haze when measured at 3 mmt as a thermoplastic resin composition is preferably 0.5 to 30. It is preferable to have transparency such that it falls within the range of %. The hollow particles (B) may be colored or the like in order to obtain a unique surface-emitting body, and therefore it is also preferable that the transparency is lowered to some extent.

Among the above, the spherical particles (B) are preferably inorganic hollow particles.
As the inorganic hollow particles, hollow glass, hollow silica, hollow ceramics and the like are preferably mentioned, but hollow glass (including hollow glass beads, glass balloons, hollow glass microspheres and the like) are particularly preferable. The hollow glass contains silicon dioxide (SiO ₂ ) as a main component and sodium oxide (NaO ₂ ), magnesium oxide (MgO), calcium oxide (CaO), boron oxide (B ₂ O ₅ ), phosphorus oxide (P) as a sub-component. It is preferably formed mainly of glass containing ₂ O ₅ ).

In the present invention, the hollow glass satisfying the specified particle diameter, diameter of the hollow portion, and volume ratio can be obtained by selecting from commercially available products, for example, in the "Glass Bubbles" series of 3M Company, USA. It is also possible to choose from. Specific examples include Glass Bubbles S22, S38, iM16K, S60HS, iM30K and the like. Among these, S38, iM16K, S60HS, and iM30K, which have high compressive fracture strength, are preferable, and iM30K is more preferable.

[Organic sulfonic acid alkali metal salt]
The thermoplastic resin composition of the present invention preferably contains a flame retardant, and as the flame retardant, an alkali metal organic sulfonate is preferable from the viewpoint of transparency. By containing an organic sulfonic acid alkali metal salt, it is possible to promote the formation of a carbonized layer at the time of combustion of the resin composition and further improve the flame retardancy, and at the same time, provide mechanical properties such as impact resistance, heat resistance, and electrical resistance. It is possible to maintain good properties such as dynamic characteristics.

Examples of the metal of the alkali metal salt include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), and cesium (Cs). Among them, sodium, potassium and cesium are most preferable. ..

Preferred examples of the organic sulfonic acid alkali metal salt include alkali metal salts of fluorine-containing aliphatic sulfonic acid or aromatic sulfonic acid. Of these, specific examples of preferable ones include potassium perfluorobutane sulfonate, lithium perfluorobutane sulfonate, sodium perfluorobutane sulfonate, cesium perfluorobutane sulfonate, potassium trifluoromethane sulfonate, lithium trifluoromethane sulfonate. , Sodium trifluoromethanesulfonate, cesium trifluoromethanesulfonate, etc., alkali metal salts of fluorine-containing aliphatic sulfonic acids having at least one C—F bond in the molecule; diphenylsulfone-3,3′-dipotassium disulfonate; Diphenylsulfone-3-sulfonate, sodium benzenesulfonate, sodium (poly)styrenesulfonate, sodium paratoluenesulfonate, sodium (branched) dodecylbenzenesulfonate, sodium trichlorobenzenesulfonate, potassium benzenesulfonate, styrenesulfone Potassium salt, potassium (poly)styrenesulfonate, potassium paratoluenesulfonate, potassium (branched) dodecylbenzenesulfonate, potassium trichlorobenzenesulfonate, cesium benzenesulfonate, cesium (poly)styrenesulfonate, cesium paratoluenesulfonate , (Branched) cesium dodecylbenzene sulfonate, cesium trichlorobenzene sulfonate, and the like, and an aromatic sulfonic acid alkali metal salt having at least one aromatic group in the molecule.

Among the above-mentioned examples, the alkali metal salt of fluorine-containing aliphatic sulfonic acid is particularly preferable, the alkali metal salt of perfluoroalkane sulfonic acid is more preferable, and specifically, potassium perfluorobutane sulfonate and the like are preferable.

The organic sulfonic acid alkali metal salt may use only a single compound, or may use two or more different compounds in any combination and ratio.

When the organic sulfonic acid alkali metal salt is contained, the content thereof is preferably 0.01 parts by mass or more and less than 0.2 parts by mass, more preferably 0.05 parts by mass with respect to 100 parts by mass of the transparent thermoplastic resin (A). To 0.15 parts by mass, more preferably 0.05 to 0.1 parts by mass. If the content of the organic sulfonic acid metal salt is less than the above lower limit, the effect of improving flame retardancy cannot be sufficiently obtained, and if it exceeds the above upper limit, transparency is lowered, which is not preferable.

[UV absorber]
It is also preferable that the thermoplastic resin composition of the present invention further contains an ultraviolet absorber.
Examples of the ultraviolet absorbent include inorganic ultraviolet absorbents such as cerium oxide and zinc oxide; organic compounds such as benzotriazole compounds, benzophenone compounds, salicylate compounds, cyanoacrylate compounds, triazine compounds, oxazanilide compounds, malonic acid ester compounds, and hindered amine compounds. Examples include UV absorbers. Of these, organic UV absorbers are preferable, and benzotriazole compounds are more preferable. By selecting an organic ultraviolet absorber, the resin composition of the present invention has good transparency and mechanical properties.

Specific examples of the benzotriazole compound include, for example, 2-(2′-hydroxy-5′-methylphenyl)benzotriazole and 2-[2′-hydroxy-3′,5′-bis(α,α-dimethylbenzyl). )Phenyl]-benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butyl-phenyl)-benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'. -Methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butyl-phenyl)-5-chlorobenzotriazole), 2-(2'-hydroxy-3 ',5'-Di-tert-amyl)-benzotriazole, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2,2'-methylenebis[4-(1,1,3,3 3-tetramethylbutyl)-6-(2H-benzotriazol-2-yl)phenol] and the like, among which 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole and 2,2'. -Methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazol-2-yl)phenol] is preferred, especially 2-(2'-hydroxy-5'-tert-. Octylphenyl)benzotriazole is preferred. Specific examples of such a benzotriazole compound include "Seesorb 701", "Seesorb 705", "Seesorb 703", "Seesorb 702", "Seesorb 704", and "Seesorb 709" manufactured by Cipro Kasei Co., Ltd. "Biosorb 520", "Biosorb 582", "Biosorb 580", "Biosorb 583", "Chemisorb 71", "Chemisorb 72" manufactured by Chemipro Kasei Co., Ltd., "Ciasorb UV5411" manufactured by Cytec Industries, and "ADESO" manufactured by ADEKA LA-32", "LA-38", "LA-36", "LA-34", "LA-31", BASF's "Tinuvin P", "Tinuvin 234", "Tinuvin 326", "Tinuvin 327". , “Tinubin 328” and the like.

Specific examples of the benzophenone compound include, for example, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, and 2-hydroxy-4-n-octoxy. Benzophenone, 2-hydroxy-n-dodecyloxybenzophenone, bis(5-benzoyl-4-hydroxy-2-methoxyphenyl)methane, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4 , 4'-dimethoxybenzophenone and the like, and specific examples of such a benzophenone compound include "Seesorb 100", "Seesorb 101", "Seesorb 101S", "Seesorb 102", and "Seesorb 102" manufactured by Cipro Kasei Co., Ltd. Seesorb 103", Kyoyaku Co., Ltd. "Biosorb 100", "Biosorb 110", "Biosorb 130", Chemi-Pro Chemicals "Chemisorb 10", "Chemisorb 11", "Chemisorb 11S", "Chemisorb 12", "Chemisorb 13" , "Chemisorb 111", "Ubinur 400" manufactured by BASF, "Ubinur M-40" manufactured by BASF, "Ubinur MS-40" manufactured by BASF, "Siasorb UV9", "Siasorb UV284", manufactured by Cytec Industries. "Siasorb UV531", "Siasorb UV24", "ADEKA STAB 1413", "ADEKA STAB LA-51" manufactured by ADEKA, and the like can be mentioned.

Specific examples of salicylate compounds include, for example, phenyl salicylate, 4-tert-butylphenyl salicylate, and such salicylate compounds are specifically, for example, "Seesorb 201" and "Seesorb" manufactured by Cipro Kasei Co. 202”, “Chemisorb 21”, “Chemisorb 22” manufactured by Chemipro Kasei Co., Ltd., and the like.

Specific examples of the cyanoacrylate compound include, for example, ethyl-2-cyano-3,3-diphenylacrylate, 2-ethylhexyl-2-cyano-3,3-diphenylacrylate, and the like. Specifically, for example, "Seesorb 501" manufactured by Cipro Kasei Co., "Biosorb 910" manufactured by Kyodo Pharmaceutical Co., Ltd., "Ubisolator 300" manufactured by Daiichi Kasei Co., Ltd., "Ubinur N-35", "Ubinur N-". 539” and the like.

Specific examples of the oxazanilide compound include, for example, 2-ethoxy-2'-ethyl oxalinic acid bisalinide, and such an oxalinide compound is specifically, for example, "Sanduboa" manufactured by Clariant. VSU” and the like.

As the malonic acid ester compound, 2-(alkylidene)malonic acid esters are preferable, and 2-(1-arylalkylidene)malonic acid esters are more preferable. Specific examples of such a malonic acid ester compound include "PR-25" manufactured by Clariant Japan Co., Ltd., "B-CAP" manufactured by BASF Co., Ltd., and the like.

When the thermoplastic resin composition of the present invention contains an ultraviolet absorber, the content thereof is usually 0.05 part by mass or more, preferably 0.1 part by mass, relative to 100 parts by mass of the transparent thermoplastic resin (A). It is at least 1 part by mass, and is usually at most 1 part by mass, preferably at most 0.5 part by mass. If the content of the ultraviolet absorber is less than the lower limit of the above range, the effect of improving the weather resistance may be insufficient, if the content of the ultraviolet absorber exceeds the upper limit of the range, the mold Devogit and the like may occur and cause mold contamination.
In addition, 1 type may be contained and 2 or more types may be contained in the ultraviolet absorber in arbitrary combinations and ratios.

[Stabilizer]
The thermoplastic resin composition of the present invention preferably contains a phosphorus-based stabilizer and/or a phenol-based antioxidant.
By containing the phosphorus-based stabilizer, the thermal stability, heat discoloration resistance, weather resistance, etc. of the resin composition can be improved. Any known phosphorous stabilizer can be used. Specific examples thereof include phosphorous oxo acids such as phosphoric acid, phosphonic acid, phosphorous acid, phosphinic acid, and polyphosphoric acid; metal acid pyrophosphate salts such as sodium acid pyrophosphate, potassium acid pyrophosphate, and calcium acid pyrophosphate; phosphoric acid Phosphates of Group 1 or Group 2B metals such as potassium, sodium phosphate, cesium phosphate, and zinc phosphate; organic phosphate compounds, organic phosphite compounds, organic phosphonite compounds, and the like. Particularly preferred.

Examples of the organic phosphite compound include triphenyl phosphite, tris(monononylphenyl)phosphite, tris(monononyl/dinonylphenyl)phosphite, tris(2,4-di-tert-butylphenyl)phosphite, monooctyl. Diphenyl phosphite, dioctyl monophenyl phosphite, monodecyl diphenyl phosphite, didecyl monophenyl phosphite, tridecyl phosphite, trilauryl phosphite, tristearyl phosphite, 2,2-methylenebis(4,6-di- tert-butylphenyl)octyl phosphite and the like. As such an organic phosphite compound, specifically, for example, "ADEKA STAB 1178", "ADEKA STAB 2112", "ADEKA STAB HP-10" manufactured by ADEKA, "JP-351" manufactured by Johoku Chemical Industry Co., Ltd., JP-360", "JP-3CP", "Irgafos 168" by BASF, etc. are mentioned.
In addition, 1 type may be contained and 2 or more types may be contained in the phosphorus stabilizer in arbitrary combinations and ratios.

The content of the phosphorus-based stabilizer is usually 0.005 parts by mass or more, preferably 0.01 parts by mass or more, and more preferably 0.03 parts by mass or more with respect to 100 parts by mass of the transparent thermoplastic resin (A). And usually 0.5 part by mass or less, preferably 0.4 part by mass or less. When the content of the phosphorus-based stabilizer is less than the lower limit of the above range, the heat stabilizing effect may be insufficient, and when the content of the phosphorus-based stabilizer exceeds the upper limit of the above range, the effect is It can reach a ceiling and become less economical.

Examples of phenolic antioxidants include hindered phenolic antioxidants. Specific examples thereof include pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl). ) Propionate, thiodiethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N,N'-hexane-1,6-diylbis[3-(3,5-di- tert-butyl-4-hydroxyphenylpropionamide), 2,4-dimethyl-6-(1-methylpentadecyl)phenol, diethyl [[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl] ] Methyl]phosphate, 3,3′,3″,5,5′,5″-hexa-tert-butyl-a,a′,a″-(mesitylene-2,4,6-triyl)tri -P-cresol, 4,6-bis(octylthiomethyl)-o-cresol, ethylenebis(oxyethylene)bis[3-(5-tert-butyl-4-hydroxy-m-tolyl)propionate], hexamethylene Bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3 ,5-Triazine-2,4,6(1H,3H,5H)-trione,2,6-di-tert-butyl-4-(4,6-bis(octylthio)-1,3,5-triazine- 2-ylamino)phenol, 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4,6-di-tert-pentylphenylacrylate and the like can be mentioned.

Among them, pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate are preferable. .. Specific examples of such a phenolic antioxidant include "Irganox 1010", "Irganox 1076" manufactured by BASF, "Adeka Stab AO-50", and "Adeka Stub AO-60" manufactured by ADEKA. Are listed.
In addition, 1 type may be contained and 2 or more types may be contained in the arbitrary combination and ratio of a phenolic antioxidant.

The content of the phenolic antioxidant is usually 0.005 parts by mass or more, preferably 0.01 parts by mass or more, and usually 0.1% by mass with respect to 100 parts by mass of the transparent thermoplastic resin (A). It is 5 parts by mass or less, preferably 0.3 parts by mass or less, and more preferably 0.2 parts by mass or less. If the content of the phenolic antioxidant is less than the lower limit of the above range, the effect as the phenolic antioxidant may be insufficient, and the content of the phenolic antioxidant is the upper limit of the above range. If the value is exceeded, the effect may reach the ceiling and it may not be economical.

[Release agent]
Further, the thermoplastic resin composition of the present invention preferably contains a release agent (lubricant). Examples of the release agent include aliphatic carboxylic acids, esters of aliphatic carboxylic acids and alcohols, aliphatic hydrocarbon compounds having a number average molecular weight of 200 to 15,000, and polysiloxane silicone oil.

Examples of the aliphatic carboxylic acid include saturated or unsaturated aliphatic monovalent, divalent or trivalent carboxylic acid. Here, the aliphatic carboxylic acid also includes an alicyclic carboxylic acid. Among these, preferable aliphatic carboxylic acids are monovalent or divalent carboxylic acids having 6 to 36 carbon atoms, and aliphatic saturated monovalent carboxylic acids having 6 to 36 carbon atoms are more preferable. Specific examples of such aliphatic carboxylic acids include palmitic acid, stearic acid, caproic acid, capric acid, lauric acid, arachidic acid, behenic acid, lignoceric acid, cerotic acid, melissic acid, tetrariacontanoic acid, montanic acid, adipic acid. Acid, azelaic acid and the like can be mentioned.

As the aliphatic carboxylic acid in the ester of aliphatic carboxylic acid and alcohol, for example, the same aliphatic carboxylic acid as described above can be used. On the other hand, examples of the alcohol include saturated or unsaturated monohydric or polyhydric alcohols. These alcohols may have a substituent such as a fluorine atom or an aryl group. Among these, a monohydric or polyhydric saturated alcohol having 30 or less carbon atoms is preferable, and an aliphatic saturated monohydric alcohol or an aliphatic saturated polyhydric alcohol having 30 or less carbon atoms is more preferable. In addition, an aliphatic is used here as a term including an alicyclic compound.

Specific examples of such alcohols include octanol, decanol, dodecanol, stearyl alcohol, behenyl alcohol, ethylene glycol, diethylene glycol, glycerin, pentaerythritol, 2,2-dihydroxyperfluoropropanol, neopentylene glycol, ditrimethylolpropane, dipentaerythritol and the like. Are listed.

The above ester may contain aliphatic carboxylic acid and/or alcohol as impurities. The above-mentioned ester may be a pure substance or a mixture of a plurality of compounds. Furthermore, as the aliphatic carboxylic acid and alcohol which are combined to form one ester, one kind may be used, or two or more kinds may be used in optional combination and ratio.

Specific examples of the ester of an aliphatic carboxylic acid and an alcohol include beeswax (mixture containing myricyl palmitate as a main component), stearyl stearate, behenyl behenate, stearyl behenate, glycerin monopalmitate, glycerin monostearate. And glycerin distearate, glycerin tristearate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, pentaerythritol tetrastearate and the like.

Examples of the aliphatic hydrocarbon having a number average molecular weight of 200 to 15,000 include liquid paraffin, paraffin wax, microwax, polyethylene wax, Fischer-Tropsch wax, and α-olefin oligomer having 3 to 12 carbon atoms. Here, alicyclic hydrocarbons are also included as the aliphatic hydrocarbons. Further, these hydrocarbons may be partially oxidized.
Among these, paraffin wax, polyethylene wax or a partial oxide of polyethylene wax is preferable, and paraffin wax and polyethylene wax are more preferable.
The number average molecular weight of the above aliphatic hydrocarbon is preferably 5000 or less.
The aliphatic hydrocarbon may be a single substance, or may be a mixture of constituent components and various molecular weights as long as the main component is within the above range.

Examples of the polysiloxane-based silicone oil include dimethyl silicone oil, methylphenyl silicone oil, diphenyl silicone oil, and fluorinated alkyl silicone.

In addition, 1 type may be contained in the mold release agent mentioned above, and 2 or more types may be contained in arbitrary combinations and ratios.

The content of the release agent is usually 0.001 part by mass or more, preferably 0.01 part by mass or more, and usually 2 parts by mass or less, with respect to 100 parts by mass of the transparent thermoplastic resin (A). Is 1 part by mass or less. If the content of the release agent is less than the lower limit of the range, the effect of releasability may not be sufficient, and if the content of the release agent exceeds the upper limit of the range, hydrolysis resistance Deterioration, and mold contamination during injection molding may occur.

[Other ingredients]
The thermoplastic resin composition of the present invention may contain other components other than those described above, if necessary, as long as the desired physical properties are not significantly impaired. Examples of other components include various resin additives and the like. In addition, 1 type may be contained in other components and 2 or more types may be contained in arbitrary combinations and ratios.

<Resin additive>
Examples of the resin additive include a flame retardant aid, a fluorescent whitening agent, a dye/pigment, an impact modifier, an antistatic agent, an antifogging agent, an antiblocking agent, a fluidity improver, a plasticizer, a dispersant, and a phase. Examples include solubilizers and antibacterial agents. In addition, 1 type may be contained in the resin additive and 2 or more types may be contained in arbitrary combinations and ratios.

As the antistatic agent, for example, an ionic liquid type antistatic agent such as a salt of dodecylbenzenesulfonic acid, a nitrogen onium salt of a perfluoroalkylsulfonyl derivative, diglycerin monolaurate, or the like can be preferably used. The blending amount thereof is preferably in the range of 0.1 to 5 parts by mass with respect to 100 parts by mass of the transparent thermoplastic resin (A).

[Production of thermoplastic resin composition]
There is no limitation on the method for producing the thermoplastic resin composition of the present invention, and any known method for producing a thermoplastic resin composition can be widely adopted.
As a specific example, after the transparent thermoplastic resin (A), the spherical particles (B), and other components to be blended as necessary are mixed in advance using various mixers such as a tumbler and a Henschel mixer. Examples of the method include melt kneading with a mixer such as a Banbury mixer, roll, Brabender, single-screw kneading extruder, twin-screw kneading extruder, and kneader. The spherical particles (B) are also preferably side-fed.

In addition, for example, it is also possible to produce a thermoplastic resin composition without premixing the respective components, or premixing only some of the components and supplying the mixture to an extruder using a feeder and melt kneading. it can.
Further, for example, a resin composition obtained by mixing some of the components in advance and supplying them to an extruder and melt-kneading the mixture is a master batch, and the master batch is mixed again with the remaining components and melt-kneaded. It is also possible to produce a thermoplastic resin composition.
Further, this masterbatch can be mixed with resin pellets as a base material and directly charged into a molding machine to produce a molded body. Further, for example, when mixing a component that is difficult to disperse, the component that is difficult to disperse is dissolved or dispersed in a solvent such as water or an organic solvent in advance, and kneaded with the solution or the dispersion liquid to disperse the component. It can also enhance sex.

[Molded body]
The thermoplastic resin composition of the present invention is molded into a molded body.
As a method for producing a molded body, any molding method generally used for thermoplastic resin compositions can be adopted. Examples include injection molding method, ultra-high speed injection molding method, injection compression molding method, two-color molding method, hollow molding method such as gas assist, molding method using heat insulating mold, and rapid heating mold. Molding method, foam molding (including supercritical fluid), insert molding, IMC (in-mold coating molding) molding method, extrusion molding method, sheet molding method, thermoforming method, rotational molding method, laminated molding method, press molding method, A blow molding method and the like can be mentioned, and a molding method using a hot runner method can also be used.
Among these, an injection molding method such as an injection molding method, an ultra-high speed injection molding method, an injection compression molding method, a sheet extrusion molding method, and a profile extrusion molding method are preferable.

In the thermoplastic resin composition of the present invention, the haze of a molded product having a thickness of 3 mm molded using the thermoplastic resin composition is preferably 1 to 30%, more preferably 3 to 30%, and further preferably 5%. ~25. If the haze exceeds 30%, the transparency is lowered, the brightness of the surface emission characteristic of the present invention is significantly lowered as the distance from the LED light source is increased, and the designability is also lowered.

Molding of the present invention is preferably in upon entering from the light source disposed along the side of the molded body, the number of bright points of 10μm or more in size 10 ² / cm ² or more. Since the large bright spots having a size (diameter) of 10 μm or more are present at 10 ² /cm ² or more, the molded body of the present invention surface-emites with high brightness on the surface perpendicular to the light source incident direction, and is bright. It is possible to express the brilliance. The molded body of the present invention that emits surface light as described above is an extremely novel and unique luminous body as a molded body for light emission by the edge light method.
The number of bright spots of 10 μm or more is preferably 10 ⁹ pieces/cm ² or less, more preferably 10 ⁸ pieces/cm ² or less, further 10 ⁷ pieces/cm ² or less, and particularly 10 ⁶ pieces/cm ² or less, and particularly It is preferably 10 ⁵ pieces/cm ² or less, and particularly preferably 10 ⁴ pieces/cm ² or less.

To measure the number of bright spots having a size of 10 μm or more, specifically, a long-sided plate of 111 mm×short side 36 mm×thickness of 2 mm and 3 mm was formed into a two-stage plate, and the edge of the short side of the 3 mm thick part was formed. LED light source (3mm cannonball type white LED OSW54K3131A made by OptoSupply Co., Ltd.) laterally arranged on the 3mm thick portion of the plate is guided, and a metal microscope (BX-51 made by Olympus Corp.) is focused on the plate surface of the 3mm thick portion. Is fixed, the number of bright spots having a size of 10 μm or more that emit light is counted, and the number per 1 cm ² is calculated.

The molded product of the present invention is characterized in that when it is surface-emitted by the edge light method, it does not emit light uniformly (homogeneous), but emits surface light with uneven graininess.

The shape of the molded body used by molding the thermoplastic resin composition of the present invention is not limited, and may be a flat plate or a non-planar shape such as a curved surface.

Preferable molded products obtained by molding the resin composition of the present invention include various optical members using LEDs or the like as a light source. Typically, it can be widely used as a member for surface light emission such as a light guide plate or a member for surface light emitter.
Among them, a surface-emitting molded body for the edge light system, which includes an LED light source at the edge of the molded body, is preferable. In the surface-emitting molded body, the light emitted from the LED light source is incident from the side of the molded plate-shaped molded body, and then diffused/refracted by the spherical particles (B) to be perpendicular to the incident angle, that is, its The surface of the molded body serves as an emission surface and emits surface light.
The molded product of the present invention emits surface light with high brightness, exhibits a glittering brilliance, is novel and has high designability, and has little brightness attenuation, and thus can be used as a surface light emitter for various applications.
Examples of those applications include, for example, optical components, illuminated switches, illuminated structural members, lighting devices, electric/electronic devices, laptop computers, mobile devices such as mobile phones, pachinko machines, pachislots, and games. Amusement equipment, OA equipment, information terminal equipment, mechanical parts, home appliances, vehicle parts (lights, interior parts, panels), indoor interiors (for example, highly aesthetic lighting members in stores, guide displays, etc.), product displays ( For example, panel members such as showcases, partition boards such as vending machines and ticket vending machines, road signs, signs, clocks, accessories, various containers, leisure goods and miscellaneous goods.

Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention should not be construed as being limited to the following examples.
In the following description, “part” means “part by mass”.
Table 1 below shows each component used in Examples and Comparative Examples.

(Examples 1-9, Comparative Examples 1-6)
[Resin pellet production]
The components shown in Table 1 were blended in the proportions (parts by mass) described in Table 2 below, mixed for 20 minutes with a tumbler mixer, and then fed to a twin-screw extruder "TEM26SX" manufactured by Japan Steel Works, The mixture was kneaded under the conditions of a screw rotation speed of 100 rpm, a discharge rate of 25 kg/hr, and a barrel temperature of 280° C., and extruded in a strand form from the tip of the extrusion nozzle. The extrudate was rapidly cooled in a water tank and cut into pellets using a pelletizer to obtain pellets of a polycarbonate resin and an acrylic resin composition.

[Polycarbonate resin molding]
The pellets obtained by the above method were dried at 120° C. for 4 hours by a hot air circulation type dryer, and then using an injection molding machine “SE-50DUZ” manufactured by Sumitomo Heavy Industries, Ltd. at a cylinder temperature of 280° C. and a mold temperature. A two-stage plate having a size of 111 mm×36 mm×thicknesses of 2 mm and 3 mm was molded at 80° C.

[Acrylic resin molding]
After drying the pellets obtained by the above method at 80° C. for 4 hours by a hot air circulation dryer, a cylinder temperature of 260° C. and a mold temperature are set by an injection molding machine “SE-50DUZ” manufactured by Sumitomo Heavy Industries, Ltd. A two-stage plate having a size of 111 mm×36 mm×thicknesses of 2 mm and 3 mm was molded at 60° C.

[Haze (3 mmt, unit: %)]
Using a turbidimeter (“NDH-2000” manufactured by Nippon Denshoku Industries Co., Ltd.) according to JIS K7136 and JIS K7361, the 3 mm thick portion of the two-stage plate obtained by the above method was used as a D65 light source, 10°. Haze (unit: %) was measured in the visual field.

[Brightness of upper surface (unit: cd/m ² ), surface emission degree, brightness retention rate (%)]
An LED white light source (3 mm bullet-type white LED OSW54K3131A manufactured by OptoSupply Co., Ltd.) was brought into contact with the side surface of the end portion in the longitudinal direction of the 3 mm thick portion of the above-mentioned two-stage plate, and when the LED light was made incident, a distance of 30 cm above the light emitting surface. A luminance meter (“CA-2500” manufactured by Konica Minolta Co., Ltd.) installed at a position was used to measure the luminance at a measurement point obtained by dividing the entire 3 mm-thick light emitting surface of the two-stage plate into 5×25×5=25. The average luminance was calculated from the obtained 25 measured values. Further, the surface emission degree was calculated by the following formula (1) as an index of the balance between brightness and transparency. A high surface luminescence value indicates high brightness and low haze, that is, excellent surface luminescence.
Surface luminescence = average luminance (cd/m ² )/haze (%) (1)
From the obtained surface emission degree, excellent (∘) or inferior (x) of surface emission was judged according to the following criteria.
◯: Surface luminescence is 10 or more ×: Surface luminescence is less than 10 Further, from the obtained brightness, the brightness retention rate was calculated as an index for evaluating the attenuation of the brightness in the longitudinal direction by the following formula (2).
Luminance retention rate (%)=minimum luminance value/maximum luminance value×100 (2)

[Yellowness difference of emission color]
An LED white light source (3 mm cannonball type white LED OSW54K3131A manufactured by OptoSupply Co., Ltd.) is brought into contact with the side surface of the longitudinal end of the 3 mm thick portion of the two-stage plate, and LED light is incident on the side 30 cm above the light emitting surface. With the installed luminance meter (“CA-2500” manufactured by Konica Minolta Co., Ltd.), the stimulus values X, Y of the luminescent color at the measurement point obtained by dividing the entire light-emitting surface of the 2-mm plate 3 mm thick part into 5×25×5=25. Z was measured. From the obtained measured values, the yellowness difference was calculated as an index for evaluating the luminescent color by the following formulas (3) and (4). A positive value of the difference in yellowness means that the yellowing of the luminescent color is large.
Yellowness difference=Yellowness near the LED light entrance-Yellowness near the LED light entrance (3)
Yellowness=100(1.28X-1.06Z)/Y (4)

[Number of bright spots (unit: pieces/cm ² ), surface emission characteristic evaluation]
An LED white light source (3 mm bullet-type white LED OSW54K3131A manufactured by OptoSupply Co., Ltd.) is brought into contact with the side surface of the end portion in the longitudinal direction of the two-stage plate, and when the LED light is made incident, the edge portion of the short side of the 3 mm thick portion. The number of bright spots having a size of 10 μm or more, which are guided from an LED light source arranged laterally to a 3 mm thick portion of the plate and emit light in the 3 mm thick portion, is 0 using a metallographic microscope (BX-51 manufactured by Olympus Corporation). Approximately every 25 mm ² was counted. The number per cm ² was calculated from the obtained number value.
A photograph showing the light emitting states of the two-stage plate of Example 2 and Comparative Examples 1 and 5 is shown in FIG.

As a surface emission characteristic evaluation, the above-described surface emission state of the plate was visually determined based on the following criteria A and B.
A: Emission with uneven graininess.
B: Uniform light emission.

The above results are shown in Table 2 below.

From the above table, the examples are excellent in the balance of brightness and haze, the brightness retention rate is high, the value of the difference in the yellowness of the emission color is low, the surface emission is not uniform, and the surface emission has a glittering shine. It turns out to be something to do.

The thermoplastic resin composition of the present invention can be used for optical parts, lighting equipment, electric/electronic equipment, office automation equipment, information terminal equipment, machine parts, home electric appliances, vehicle parts, building materials, various containers, leisure goods, miscellaneous goods, etc. It can be widely and suitably used for parts and the like, and has very high industrial utility.

Claims (7)

Spherical particles (B) having a hollow structure having an average particle diameter of 12 to 40 μm, a hollow portion diameter of 10 μm or more, and a hollow portion volume ratio of 50% or more with respect to 100 parts by mass of the transparent thermoplastic resin (A). 0.001 to 0.09 parts by mass of the thermoplastic resin composition. The thermoplastic resin composition according to claim 1, wherein the spherical particles (B) have a compressive fracture strength of 10 MPa or more. The thermoplastic resin composition according to claim 1 or 2, wherein the transparent thermoplastic resin (A) is a polycarbonate resin or an acrylic resin. A molded body comprising the thermoplastic resin composition according to claim 1. The molded product according to claim 4, which has a haze of 0.5 to 30% when measured at 3 mmt. An edge light type light emitting device, characterized in that, when light is incident from a light source arranged along the side surface of the molded body, the number of bright spots having a size of 10 μm or more is 100/cm ² or more. Item 5. A molded article according to item 4. The molded body according to any one of claims 4 to 6, which is a light guide plate for edge light type light emission.