JP2006176566A - Light-shielding molding having light reflection function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a molding that has excellent light reflectance and light screening property, prevents light leakage from a light source and controls a light loss. <P>SOLUTION: The molding comprises a resin composition composed of 3-30 pts.wt. of titanium oxide (B) and 0.0001-0.1 pt.wt. of a dye or pigment (C) (except the component (B)) based on 100 pts.wt. of a thermoplastic resin (A). The resin composition constituting the molding has ≥50% total light reflectance (R) [unit: %] measured according to JIS-K-7105 and ≤0.1% total light transmittance (T) [unit: %] at 2 mm thickness. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a molded body made of a thermoplastic resin that has a high light-shielding property and also has a light reflection performance. Furthermore, it is related with the molded object which is excellent also in characteristics, such as mechanical strength, color tone stability, and a flame retardance, has a high light-shielding property, and has light reflection performance.

A molded body made of a resin composition in which titanium oxide is blended with a thermoplastic resin is widely used as a housing having a white appearance, a sheet, a film, or a material having a light reflection function.
In particular, a resin composition obtained by blending aromatic polycarbonate with titanium oxide has a high whiteness, is excellent in light reflectivity, and has excellent dimensional stability, impact resistance, or heat resistance. Therefore, it is also used for display lamps such as guide lights and advertisement lights, and reflectors for backlight units for liquid crystal displays.
In order to enhance the light reflection function of the thermoplastic resin, a method of blending titanium oxide is common. As recent examples of methods for adding titanium oxide to an aromatic polycarbonate resin composition to enhance light reflectivity, Patent Documents 1 to 4 and the like can be mentioned.
On the other hand, a member related to a lighting fixture or a liquid crystal backlight unit may be required to have a function of preventing light leakage from a light source, that is, “light shielding”.
In particular, liquid crystal backlight unit-related materials, such as liquid crystal backlight frame molded products, use molded products colored in black for the purpose of preventing light leakage from the light source and preventing malfunction of the electronic circuit due to light leakage. May be. In particular, backlight units used in liquid crystal displays for monitors often use multiple light sources to improve brightness. In this case, a backlight frame molded body colored in black is generally used. in use.

However, when the backlight frame molded body colored in black is used, the light-shielding property can be sufficiently achieved, but because of the black color, a loss of light occurs and the luminance as a backlight is reduced. It was also.
In order to reduce the loss of the light source, it is desirable to use a molded body having a high reflectance, but in general, a thermoplastic resin can increase the reflectance by adding a large amount of titanium oxide. However, there is a problem that sufficient effects cannot be obtained with respect to the light shielding property and light leakage occurs.
Moreover, when the compounding quantity of the titanium oxide with respect to a thermoplastic resin increases, since the chemically active point exists in the surface of a titanium oxide, this may accelerate | stimulated deterioration of resin at the time of melt-kneading and melt-molding. Moreover, when the compounding quantity of titanium oxide increases, the strength as a material often becomes insufficient.
Therefore, if it is possible to provide a thermoplastic resin molded article that has both excellent light shielding properties and light reflectivity and is excellent in strength as a molded article, it is possible to reduce the loss of the light source, and to provide a lighting apparatus or liquid crystal with excellent luminance. A backlight unit can be constructed, and its industrial significance is great.
In addition, resin composition molded articles used for OA equipment and electrical / electronic equipment often require high flame retardancy at the same time, and recently, brominated flame retardants or phosphorus-based flame retardants have been taken into consideration for the environment. There is a need for flame retardant resin composition molded bodies that do not use a flame retardant.

JP 2003-183491 A JP 2003-213114 A JP 2003-213144 A JP 2003-226805 A

  The present invention is a molded product made of a thermoplastic resin having a high light-shielding property and also having a light reflecting property, and also has a high light-shielding property which is excellent in mechanical strength, color stability, flame retardancy and the like at the same time. An object of the present invention is to provide a molded article that has the properties of light reflection.

As a result of diligent study, the present inventors have found that 3 to 30 parts by weight of titanium oxide (B), dye / pigment (excluding component (B)) (C) 0. A molded product comprising a resin composition containing 0001 to 0.1 parts by weight, wherein the resin composition constituting the molded product is measured in accordance with JIS-K-7105. %] Is 50% or more, and the molded article is characterized in that the total light transmittance (T) [unit:%] at a thickness of 2 mm is 0.1% or less. The inventors have found that this can be achieved and have reached the present invention.
That is, the present invention includes the following [1] to [10].
[1] 3 to 30 parts by weight of titanium oxide (B), dye / pigment (excluding component (B)) (C) 0.0001 to 0.1 parts by weight with respect to 100 parts by weight of the thermoplastic resin (A) The total light reflectance (R) [unit:%] measured by the resin composition constituting the molded body according to JIS-K-7105 is 50% or more. And a total light transmittance (T) [unit:%] at a thickness of 2 mm is 0.1% or less.
[2] The molded article according to [1], wherein the thermoplastic resin (A) is an aromatic polycarbonate or a resin mainly composed of an aromatic polycarbonate.
[3] The molded article according to [1] or [2], wherein the resin composition constituting the molded article further contains 0.001 to 30 parts by weight of a flame retardant (D).
[4] The molded article according to any one of [1] to [3], wherein the resin composition constituting the molded article further contains 0.01 to 1 part by weight of a fluoropolymer (E). .
[5] The above [3] or [4], wherein the flame retardant (D) is at least one organic acid metal salt selected from organic acid alkali metal salts and organic acid alkaline earth metal salts The molded product according to 1.
[6] The resin composition constituting the molded body is aromatic polycarbonate or 100 parts by weight of resin (component (A)) mainly composed of aromatic polycarbonate, 3 to 30 parts by weight of titanium oxide (component (B)), Dye and pigment (excluding component (B)) (component (C)) 0 to 0.1 parts by weight, at least one organic acid metal salt selected from organic acid alkali metal salts and organic acid alkaline earth metal salts ( The aromatic polycarbonate resin composition comprising 0.001 to 1 part by weight of component (D)) and 0.01 to 1 part by weight of a fluoropolymer (component (E)), according to the above [1] Molded body.
[7] The above-mentioned [1], wherein the resin composition constituting the molded body is an aromatic polycarbonate resin composition further containing 0.1 to 30 parts by weight of a silicate compound (component (F)). ] To [6].
[8] The resin composition constituting the molded body is an aromatic polycarbonate resin composition further containing 0.001 to 5 parts by weight of an organic acidic compound and / or an organic acidic compound derivative (component (G)). The molded article according to [7] above, which is characterized in that
[9] The molded body according to any one of [1] to [8], wherein the molded body is an injection molded body or an extrusion molded body.
[10] The molded body according to [9], wherein the molded body is a frame molded body for a liquid crystal backlight unit.

  The molded product from the thermoplastic resin of the present invention having a high light-shielding property and also having light reflection performance can prevent light leakage from the light source and at the same time suppress light loss, so it has excellent luminance. It is possible to construct a lighting fixture and a liquid crystal backlight unit, and its industrial significance is great.

The molded article of the present invention has a total light reflectance (R) [unit:%] measured according to JIS-K-7105 of 50% or more, preferably 60% or more, more preferably 70% or more. Say. When the total light reflectance (R) is less than 50%, it is not sufficient for achieving the luminance improvement aimed at by the present invention.
Furthermore, in the present invention, the resin composition constituting the molded body has a total light transmittance (T) [unit:%] at a thickness of 2 mm measured according to JIS-K-7105 of 0.1% or less, Preferably, the molded product is characterized in that the total light transmittance at a thickness of 1.5 mm is 0.1% or less, more preferably the total light transmittance at a thickness of 1.0 mm is 0.1% or less. Yes, the object of the present invention can be achieved when the total light reflectance (R) and the total light transmittance satisfy the requirements of the present invention.

The present invention will be specifically described below.
In the present invention, the component (A) is a thermoplastic resin, for example, polycarbonate resin, polystyrene resin, polymethacrylate resin, styrene / methacrylate copolymer, ABS resin, polyester resin, polyolefin resin, polyarylate. Resin, polyvinyl chloride resin, polyamide resin, polyphenylene ether resin, polyphenylene sulfide resin, etc., or a mixture of two or more of them can be used.
In the present invention, the component (A) is most preferably an aromatic polycarbonate resin or a resin mainly composed of an aromatic polycarbonate from the viewpoints of reflectivity, heat resistance, light resistance, heat discoloration, dimensional stability, rigidity, and impact resistance. It can be preferably used.
Here, the resin mainly composed of aromatic polycarbonate means that when the total amount of component (A) is 100 parts by weight, the component exceeding 50 parts by weight of component (A) is aromatic polycarbonate, and the remaining resin The component is a thermoplastic resin other than the aromatic polycarbonate.

The aromatic polycarbonate preferably used as the component (A) of the present invention is an aromatic polycarbonate derived from an aromatic dihydroxy compound. Examples of the aromatic dihydroxy compound include 1,1-bis (4-hydroxy-t -Butylphenyl) propane, bis (hydroxyaryl) alkanes such as 2,2-bis (4-hydroxyphenyl) propane, 1,1-bis (4-hydroxyphenyl) cyclopentane, 1,1-bis (4- Bis (hydroxyaryl) cycloalkanes such as hydroxyphenyl) cyclohexane, dihydroxyaryl ethers such as 4,4′-dihydroxydiphenyl ether, 4,4′-dihydroxy-3,3′-dimethylphenyl ether, 4,4′- Dihydroxydiphenyl sulfide, 4,4 -Dihydroxyaryl sulfides such as dihydroxy-3,3'-dimethylphenyl sulfide, dihydroxyaryl sulfoxides such as 4,4'-dihydroxydiphenyl sulfoxide, 4,4'-dihydroxy-3,3'-dimethylphenyl sulfoxide, 4 , 4'-dihydroxydiphenylsulfone, dihydroxyarylsulfones such as 4,4'-dihydroxy-3,3'-dimethylphenylsulfone, and the like.
Among these, 2,2-bis (4-hydroxyphenyl) propane (common name, bisphenol A) is particularly preferable. These aromatic dihydroxy compounds can be used alone or in combination of two or more.

As the aromatic polycarbonate preferably used as the component (A) of the present invention, those produced by a known method can be used. Specifically, a known method of reacting an aromatic dihydroxy compound and a carbonate precursor, for example, reacting an aromatic dihydroxy compound and a carbonate precursor (for example, phosgene) in the presence of an aqueous sodium hydroxide solution and a methylene chloride solvent. Crystallized carbonate prepolymer obtained by interfacial polymerization method (eg phosgene method), transesterification method (melting method) in which aromatic dihydroxy compound and carbonic acid diester (eg diphenyl carbonate) are reacted, phosgene method or melting method Polymerization method [Japanese Patent Laid-Open No. 1-158033 (corresponding to US Pat. No. 4,948,871), Japanese Patent Laid-Open No. 1-271426, Japanese Patent Laid-Open No. 3-68627 (US Pat. No. 5,204,377) Can be used.
Particularly preferred as the aromatic polycarbonate used as the component (A) of the present invention is substantially free of chlorine atoms produced by a transesterification method from a dihydric phenol (aromatic dihydroxy compound) and a carbonic acid diester. Aromatic polycarbonate.
The weight average molecular weight (Mw) of the aromatic polycarbonate is usually 5,000 to 500,000, preferably 10,000 to 100,000, more preferably 13,000 to 50,000, and particularly preferably. Is 15,000 to 30,000, particularly preferably 17,000 to 25,000.

In the present invention, the weight average molecular weight (Mw) of the aromatic polycarbonate can be measured using gel permeation chromatography (GPC), and the measurement conditions are as follows.
That is, it is obtained by using a converted molecular weight calibration curve according to the following formula from the composition curve of standard monodisperse polystyrene using polystyrene gel with tetrahydrofuran as a solvent.
M _pc = 0.3591M _ps ^1.0388
(M _pc is the molecular weight of aromatic polycarbonate, M _ps is the molecular weight of polystyrene)
Moreover, it is also a preferable embodiment that the aromatic polycarbonate preferably used as (A) of the present invention is a combination of two or more aromatic polycarbonates having different molecular weights. For example, an aromatic polycarbonate of an optical disk material whose Mw is usually in the range of 14,000 to 16,000, and an aromatic for injection molding or extrusion molding whose Mw is usually in the range of 20,000 to 50,000. A combination of polycarbonates can also be used.
Examples of the thermoplastic resin other than the aromatic polycarbonate that can be preferably used in the resin mainly composed of the aromatic polycarbonate include polystyrene, high impact polystyrene (HIPS), acrylonitrile-styrene resin (AS resin), and butyl acrylate. -Acrylonitrile-styrene resin (BAAS resin), acrylonitrile-butadiene-styrene resin (ABS resin), methyl methacrylate-butadiene-styrene resin (MBS resin), butyl acrylate-acrylonitrile-styrene resin (AAS resin), polyethylene terephthalate and polybutylene Examples thereof include polyester resins such as terephthalate, thermoplastic resins such as polyamide resin, polymethyl methacrylate, and polyarylate. In particular, AS resin and BAAS resin are preferable for improving fluidity, ABS resin and MBS resin are preferable for improving impact resistance, and polyester resin is preferable for improving chemical resistance.

In the present invention, the titanium oxide used as component (B) is not limited by the production method, crystal structure and particle size, but is titanium oxide produced by the chlorine method, and has a rutile crystal structure. What is taken is preferred.
The average particle diameter of titanium oxide generally used as a pigment is 0.1 to 0.4 μm, but the component (B) used in the present invention may have a particle diameter of less than 0.1 μm. Absent.
The titanium oxide used in the present invention is preferably one that has been surface treated with one or more inorganic surface treatment agents selected from alumina hydrate and silicic acid hydrate. More preferably, in addition to the inorganic surface treatment, titanium oxide treated with an organic surface treatment agent is more preferred. The surface-treated titanium oxide is preferable because the molecular weight reduction and discoloration of the base resin can be suppressed when the resin composition is melt-kneaded at a high temperature.
Examples of the organic surface treatment agent include organopolysiloxanes such as alkylpolysiloxane, alkylarylpolysiloxane, and alkylhydrogenpolysiloxane, and organosilicones such as alkylalkoxysilane and amino silane coupling agents. Preferred treatment agents include methyl hydrogen polysiloxane, methyltrimethoxysilane, trimethylmethoxysilane, N-β (aminoethyl) -γ-aminopropyltrimethoxysilane, N-β (aminoethyl) -γ-aminopropylmethyl. Examples include dimethoxysilane. The surface treatment agent may contain a stabilizer, a dispersant and the like in an amount that does not inhibit the present invention. In addition, as a surface treatment method, a method in which titanium oxide and a surface treatment agent are dispersed in water or an organic solvent and wet treatment, or a dry treatment method using a super mixer, a hensil mixer, or the like, or a surface treatment agent, A method in which titanium oxide and the thermoplastic resin as component (A) are simultaneously mixed with a V-type blender, and a method in which they are simultaneously introduced into an extruder and melt-kneaded are also effective.

The amount of titanium oxide (B) that can be used in the present invention is 3 to 30 parts by weight, preferably 4 to 20 parts by weight, more preferably 5 to 15 parts by weight, based on 100 parts by weight of the thermoplastic resin (A). Parts, particularly preferably 6 to 12 parts by weight. If the blending ratio of titanium oxide is less than 3 parts by weight, the light-shielding property and reflectivity are insufficient. On the other hand, if it exceeds 30 parts by weight, the impact strength of the resin composition is greatly reduced, which is not preferable.
The component (C) that can be used in the present invention is a dye / pigment. In the present invention, the dye / pigment represents a pigment or dye that can be used for coloring a thermoplastic resin.
Since the molded article of the present invention is a molded article maintaining light reflectivity, the amount of component (C) used is extremely small. However, in the present invention, by using a combination of an extremely small amount of the component (C) in addition to the component (B), a molded product with significantly improved light shielding properties can be obtained.
Specific examples of such component (C) include inorganic pigments such as titanium yellow, petal, ultramarine, cobalt blue, and spinel green, condensed azo organic pigments, quinacdolin organic pigments, isoindolinone organic pigments, and perylene organics. Pigments, organic pigments such as anthraquinone organic pigments, phthalocyanine organic pigments, carbon black, perylene dyes, coumarin dyes, thioindigo dyes, anthraquinone dyes, thioxanthone dyes, perinone dyes, quinoline dyes, quinacridone And organic dyes such as dyes, dioxazine dyes, isoindolinone dyes and phthalocyanine dyes. In this invention, a component (C) can also be used in combination of 2 or more type.

The amount of component (C) in the present invention is 0.0001 to 0.1 parts by weight, preferably 0.0002 to 0.1 parts by weight, and 0.0005 to 100 parts by weight of component (A). 0.01 part by weight is more preferable, 0.001 to 0.005 part by weight is further preferable, and 0.002 to 0.001 part by weight is particularly preferable.
When the amount of the component (C) used is less than 0.0001 part by weight, the light shielding property is insufficient. On the other hand, when it exceeds 0.1 part by weight, the light reflectivity of the molded product tends to decrease.
Component (D) used in the present invention is a flame retardant, and represents a flame retardant that can be used for flame retardant thermoplastic resins.
Examples of the component (D) used in the present invention include organic phosphorus compounds (mainly phosphates and phosphazenes), organopolysiloxanes, halogen-containing compounds, metal oxides, metal hydroxides, triazine compounds, red phosphorus, zirconium compounds, Examples thereof include polyphosphate compounds, sulfamic acid compounds, and organic metal sulfonic acid alkali metal salts.
Although the compounding quantity of the component (D) in this invention changes according to the kind of flame retardant to be used, and the level of required flame retardance, it is 0.001 with respect to 100 weight part of component (A) normally. 30 parts by weight, preferably 0.01 to 20 parts by weight, more preferably 0.05 to 15 parts by weight, still more preferably 0.08 to 10 parts by weight.

In the present invention, an aromatic polycarbonate can be most preferably used as the component (A). However, when the component (A) is an aromatic polycarbonate, those that can be preferably used as the component (D) are organic acid alkali metal salts and It is at least one organic acid metal salt selected from organic acid alkaline earth metal salts.
Such an organic acid metal salt is a metal salt of an organic sulfonic acid and / or a metal salt of a sulfate ester, and these may be used alone or in combination of two or more.
Examples of the alkali metal contained in the organic acid metal salt include lithium, sodium, potassium, rubidium, and cesium, and examples of the alkaline earth metal include beryllium, magnesium, calcium, strontium, and barium.
In the present invention, particularly preferred alkali metals are lithium, sodium and potassium, and most preferably sodium and potassium.
Examples of the metal salts of organic sulfonic acids that can be preferably used in the present invention include alkali / alkaline earth metal salts of aliphatic sulfonic acids, alkali / alkaline earth metal salts of aromatic sulfonic acids, and the like. In the present specification, the term “alkali / alkaline earth metal salt” is used to include both alkali metal salts and alkaline earth metal salts.

Alkali / alkaline earth metal salts of aliphatic sulfonic acids include alkali / alkaline earth metal salts of alkane sulfonic acids having 1 to 8 carbon atoms, or alkyl groups of alkali / alkaline earth metal salts of such alkane sulfonic acids. Alkali / alkaline earth metal salts of sulfonic acids partially substituted with fluorine atoms, and further alkali / alkaline earth metal salts of perfluoroalkanesulfonic acids having 1 to 8 carbon atoms can be preferably used. Preferable specific examples include perfluoroethanesulfonic acid sodium salt and perfluorobutanesulfonic acid potassium salt.
In addition, as the alkali / alkaline earth metal salt of aromatic sulfonic acid, as aromatic sulfonic acid, monomeric or polymeric aromatic sulfide sulfonic acid, aromatic carboxylic acid and its ester sulfonic acid, monomeric or Polymeric aromatic ether sulfonic acid, aromatic sulfonate sulfonic acid, monomeric or polymeric aromatic sulfonic acid, monomeric or polymeric aromatic sulfonesulfonic acid, aromatic ketone sulfonic acid, heterocyclic An aromatic sulfonate alkali / alkaline earth metal salt having an aromatic sulfonic acid as at least one selected from the group consisting of a sulfonic acid, a sulfonic acid of an aromatic sulfoxide, and a condensate of an aromatic sulfonic acid by a methylene type bond Can be mentioned.
Preferred examples of the monomeric or polymeric aromatic sulfonic acid alkali / alkaline earth metal salts include diphenyl sulfide-4,4′-disulfonic acid disodium and diphenyl sulfide-4,4′-disulfone. Mention may be made of dipotassium acid.

Preferred examples of the sulfonic acid alkali / alkaline earth metal salts of the aromatic carboxylic acids and esters thereof include potassium 5-sulfoisophthalate, sodium 5-sulfoisophthalate, and polysodium poly (ethylene terephthalate). be able to.
The monomeric or polymeric aromatic ether sulfonate alkali / alkaline earth metal salt is, as a preferred example thereof, 1-methoxynaphthalene-4-calcium sulfonate, 4-sodium dodecylphenyl ether disulfonate, Poly (2,6-dimethylphenylene oxide) polysodium sulfonate, poly (1,3-phenylene oxide) polysodium sulfonate, poly (1,4-phenylene oxide) polysodium sulfonate, poly (2,6-diphenyl) Phenylene oxide) polypotassium polysulfonate, lithium poly (2-fluoro-6-butylphenylene oxide) polysulfonate.
Moreover, the sulfonate alkali / alkaline earth metal salt of the said aromatic sulfonate can mention the potassium sulfonate of benzenesulfonate as the preferable example.

The monomeric or polymeric aromatic sulfonic acid alkali / alkaline earth metal salts are preferably sodium benzenesulfonate, potassium benzenesulfonate, strontium benzenesulfonate, magnesium benzenesulfonate, p-benzene. Examples include dipotassium disulfonate, dipotassium naphthalene-2,6-disulfonate, calcium biphenyl-3,3′-disulfonate, sodium toluenesulfonate, potassium toluenesulfonate, and potassium xylenesulfonate.
The monomeric or polymeric aromatic sulfonesulfonic acid alkali / alkaline earth metal salts include, as preferred examples, sodium diphenylsulfone-3-sulfonate, potassium diphenylsulfone-3-sulfonate, and diphenylsulfone-3. , 3′-disulfonic acid dipotassium, diphenylsulfone-3,4′-disulfonic acid dipotassium.
Preferred examples of the sulfonate alkali / alkaline earth metal salt of the aromatic ketone include sodium α, α, α-trifluoroacetophenone-4-sulfonate and dipotassium benzophenone-3,3′-disulfonate. Can do.
Preferred examples of the heterocyclic alkali sulfonate / alkaline earth metal salt include disodium thiophene-2,5-disulfonate, dipotassium thiophene-2,5-disulfonate, and calcium thiophene-2,5-disulfonate. And sodium benzothiophene sulfonate.
Preferred examples of the aromatic sulfonate alkali / alkaline earth metal salt of aromatic sulfoxide include potassium diphenyl sulfoxide-4-sulfonate.
Preferred condensates of the above aromatic sulfonate alkali / alkaline earth metal salt by methylene type bond include a formalin condensate of sodium naphthalene sulfonate and a formalin condensate of sodium anthracene sulfonate.

On the other hand, as the alkali / alkaline earth metal salt of a sulfate ester, a monovalent and / or polyhydric alcohol sulfate / alkaline earth metal salt can be preferably used in the present invention. As sulfates of polyhydric alcohols, methyl sulfate, ethyl sulfate, lauryl sulfate, hexadecyl sulfate, polyoxyethylene alkylphenyl ether sulfate, pentaerythritol mono, di, tri, tetrasulfate And sulfuric acid ester of lauric acid monoglyceride, sulfuric acid ester of palmitic acid monoglyceride, and sulfuric acid ester of stearic acid monoglyceride. Particularly preferable alkali / alkaline earth metal salts of these sulfates include alkali / alkaline earth metal salts of lauryl sulfate.
Examples of other alkali / alkaline earth metal salts include alkali sulfonamide alkali / alkaline earth metal salts such as saccharin, N- (p-tolylsulfonyl) -p-toluenesulfonimide. N- (N′-benzylaminocarbonyl) sulfanilimide, and alkali / alkaline earth metal salts of N- (phenylcarboxyl) sulfanilimide, and the like.
Among the enumerated above, more preferable alkali / alkaline earth metal salts include alkali / alkaline earth metal salts of aromatic sulfonic acid and alkali / alkaline earth metal salts of perfluoroalkanesulfonic acid.

In the present invention, when the component (A) is an aromatic polycarbonate, at least one organic acid metal salt selected from the organic acid alkali metal salts and organic acid alkaline earth metal salts that can be preferably used as the component (D). The amount used is usually 0.001 to 1 part by weight, preferably 0.005 to 0.8 part by weight, and more preferably 0.01 to 0.7 part by weight with respect to 100 parts by weight of the component (A). 0.03-0.5 part by weight is more preferred, 0.05-0.3 part by weight is particularly preferred, and 0.06-0.2 part by weight is most preferred.
Component (E) that can be used in the present invention is a fluoropolymer, and is used for the purpose of preventing dripping of combustion products. The component (E) that can be preferably used in the present invention is a fluoropolymer having a fibril-forming ability, and a tetrafluoroethylene polymer such as polytetrafluoroethylene or a tetrafluoroethylene / propylene copolymer is preferably used. Particularly preferred is polytetrafluoroethylene.
As the component (E), various forms of fluoropolymers such as a fine powdery fluoropolymer, an aqueous dispersion of fluoropolymer, and a powdery mixture with a second resin such as AS or PMMA can be used.
As an aqueous dispersion of a fluoropolymer that can be preferably used in the present invention, “Teflon 30J (registered trademark)” manufactured by Mitsui DuPont Fluorochemical Co., Ltd., “Polyflon D-1 (registered trademark)” manufactured by Daikin Industries, Ltd., “Polyfluorocarbon” Examples thereof include “D-2 (registered trademark)”, “Polyflon D-2C (registered trademark)”, and “Polyflon D-2CE (registered trademark)”.

In the present invention, a fluoropolymer in a powdery mixture with a second resin such as AS or PMMA can also be suitably used as the component (E). Techniques relating to the fluoropolymer as a mixture are disclosed in JP-A-9-95583 (corresponding to US Pat. No. 5,804,654) and JP-A-11-49912 (US Pat. No. 6,040,370). , JP 2000-143966 A, JP 2000-297189 A, and the like. Fluoropolymers in a powdery mixture with these second resins that can be preferably used in the present invention include “Blendex 449 (registered trademark)” manufactured by GE Specialty Chemicals, and “Metablene A-3800 (registered trademark) manufactured by Mitsubishi Rayon Co., Ltd. Trademark) ”.
When using a component (E) in this invention, the compounding quantity is 0.01-1 weight part normally with respect to 100 weight part of components (A), Preferably it is 0.05-0.8 weight part. More preferably, it is 0.1-0.6 weight part, More preferably, it is 0.1-0.4 weight part. When the usage-amount of a component (E) exceeds 1 weight part, it exists in the tendency for the surface appearance of a molded object to fall.

In the present invention, an aromatic polycarbonate can be most preferably used as the component (A). However, when the component (A) is an aromatic polycarbonate, it preferably contains a silicate compound (component (F)). Such a silicate compound is a silicate compound comprising a metal oxide component and a SiO ₂ component. The silicate compound that can be used as the component (F) may be in any form such as orthosilicate, disilicate, cyclic silicate, chain silicate, layered silicate, etc.
The “silicate compound” may be any compound of a complex oxide, an oxyacid salt, and a solid solution, and the complex oxide is a combination of two or more of a single oxide, and a single oxide and an oxyacid salt. The solid solution may be either a solid solution of two or more metal oxides or a solid solution of two or more oxyacid salts. The “silicate compound” may be a hydrate.
The “silicate compound” may be a natural product or an artificial synthetic product. As the artificial compound, silicate compounds obtained from various conventionally known methods, for example, various synthesis methods using a solid reaction, a hydrothermal reaction, an ultrahigh pressure reaction, and the like can be used.

The silicate compound particularly preferably used as the component (F) of the present invention preferably has a composition substantially represented by the following formula (1).
_{xMO · ySiO 2 · zH 2 O} (1)
(Here, x and y represent natural numbers, z represents an integer of 0 or more, MO represents a metal oxide component, and may be a plurality of metal oxide components.)
Examples of the metal M in the metal oxide MO include potassium, sodium, lithium, barium, calcium, zinc, manganese, iron, cobalt, magnesium, zirconium, aluminum, and titanium.
In the metal oxide MO, preferred is one that substantially contains either CaO or MgO. Further preferred is the case where the metal oxide MO consists essentially of at least one component selected from CaO and MgO, and particularly preferred is the case consisting essentially of MgO.

Specific examples of the silicate compound preferably used as the component (F) of the present invention include talc, mica, wollastonite, zonotlite, kaolin clay, montmorillonite, bentonite, sepiolite, imogolite, sericite, lawsonite, smectite, and the like. Can be listed.
The “silicate compound” can be of any shape (plate, needle, granular, fiber, etc.), but is preferably plate or needle, and in particular, plate Are most preferably used as the component (F) of the present invention.
Here, the plate-like form means that when the average particle diameter is (a) and the thickness is (c), the a / c ratio is 5 to 500, preferably 10 to 300, more preferably 20 to 200. It is of shape.
The needle-like form means that the a / c ratio is 5 to 500, preferably 10 to 10 when the average particle diameter in the major axis direction is (a) and the average particle diameter in the uniaxial direction is (c). 300, more preferably 20-200.
In the present invention, the average particle size of the component (F) is preferably 0.1 to 500 μm, more preferably 0.5 to 100 μm, further preferably 1 to 50 μm, particularly preferably 2 to 30 μm, most preferably 3 to 20 μm. preferable.
The average particle size referred to in the present invention is determined by a laser diffraction method (for example, using SALD-2000 manufactured by Shimadzu Corporation).

Among the silicate compounds that can be used as the component (F) of the present invention, talc and mica are particularly preferable.
Talc that can be particularly preferably used as the component (F) of the present invention is a hydrous magnesium silicate having a layered structure, represented by the chemical formula 4SiO ₂ .3MgO.H ₂ O, usually about 63 wt% SiO ₂ , It contains about 32% MgO, about 5% by weight H ₂ O, other Fe ₂ O ₃ , CaO, Al ₂ O _{3 and the} like, and has a specific gravity of about 2.7.
In addition, as the talc that can be particularly preferably used as the component (F) of the present invention, calcined talc, talc that has been washed with an acid such as hydrochloric acid or sulfuric acid to remove impurities, and the like can be preferably used. Furthermore, talc that has been subjected to surface hydrophobic treatment with a silane coupling agent, a titanate coupling agent, or the like can also be used.
On the other hand, mica which can be particularly preferably used as the component (F) of the present invention is a pulverized product of silicate mineral containing aluminum, potassium, magnesium, sodium, iron and the like. Mica includes muscovite (mascobite, chemical formula: K (AlSi ₃ O ₁₀ ) (OH) ₂ Al ₄ (OH) ₂ (AlSi ₃ O ₁₀ ) K), phlogopite (phlogopite, chemical formula: K (AlSi ₃ O ₁₀₎ ) (OH) ₂ Mg ₆ (OH) ₂ (AlSi ₃ O ₁₀ ) K), biotite (biotite, chemical formula: K (AlSi ₃ O ₁₀ ) (OH) ₂ (Mg, Fe) ₆ (OH) ₂ ( AlSi ₃ O ₁₀ ) K), artificial mica (fluorine phlogopite, chemical formula: K (AlSi ₃ O ₁₀ ) (OH) ₂ F ₂ Mg ₆ F ₂ (AlSi ₃ O ₁₀ ) K) Any mica can be used, but muscovite is preferred.
Such mica may be subjected to surface hydrophobic treatment with a silane coupling agent, a titanate coupling agent, or the like.
When using a component (F) in this invention, the usage-amount is 0.1-30 weight part normally with respect to 100 weight part of component (A), 0.5-25 weight part is preferable, 1 -20 parts by weight is more preferable, 2-15 parts by weight is still more preferable, and 3-10 parts by weight is particularly preferable.
Furthermore, when using the said component (F) in this invention, it is preferable to use together an organic acidic compound and / or an organic acidic compound derivative (component (G)).

Specific examples of the component (G) that can be used in the present invention include organic acid derivatives selected from organic acids and / or organic acid esters, organic acid anhydrides, organic acid phosphonium salts, and organic acid ammonium salts. be able to.
In the present invention, by using a combination of component (F) and component (G), the flame retardancy and melt stability of the resin composition can be dramatically improved.
In addition, in the case where the component (F) is used in the present invention, the amount of the component (G) used relative to the component (F) is also extremely important. Even if it exists, it becomes difficult to obtain the melt stability and color tone stability of the resin composition.
The “organic acid” is an organic compound containing at least one group selected from the group consisting of —SO ₃ H group, —COOH group, and —POH group in the molecular structure, ie, organic sulfonic acid, organic carboxylic acid, Organic phosphoric acid. Of these, organic sulfonic acids and organic carboxylic acids are preferred in the present invention, and organic sulfonic acids are particularly preferred.
The “organic acid derivative” represents an organic acid ester, an organic acid anhydride, an organic acid phosphonium salt, or an organic acid ammonium salt derived from the organic acid.
The “organic acid derivative (G) selected from organic acids and / or organic acid esters, organic acid anhydrides, organic acid phosphonium salts, and organic acid ammonium salts” is not only a low molecular weight compound, but also an oligomeric or polymeric material. Things can be used.

In the present invention, two or more components (G) can be used in combination.
As component (G) of the present invention, organic sulfonic acid derivatives and organic carboxylic acids selected from organic sulfonic acids and / or organic sulfonic acid esters, organic sulfonic acid phosphonium salts, and organic sulfonic acid ammonium salts are particularly preferably used. it can.
Among them, when an organic sulfonic acid or organic sulfonic acid ester is used as the component (G), the melt stability of the resin composition is particularly excellent, and the generation of volatile components can be suppressed to a low level. The molding process can be performed in the temperature range and the appearance of the molded product is extremely excellent.
As the component (G) of the present invention, benzenesulfonic acid, p-toluenesulfonic acid, xylenesulfonic acid, naphthalenesulfonic acid, diisopropylnaphthalenesulfonic acid, diisobutylnaphthalenesulfonic acid, dodecyl are preferably used as organic sulfonic acids. Examples include aromatic sulfonic acids such as benzenesulfonic acid, aliphatic sulfonic acids having 8 to 18 carbon atoms, sulfonated polystyrene, polymers such as methyl acrylate / sulfonated styrene copolymer, and oligomeric organic sulfonic acids. be able to.
Examples of the organic sulfonic acid ester that can be used as the component (G) of the present invention include methyl benzenesulfonate, ethyl benzenesulfonate, propyl benzenesulfonate, butyl benzenesulfonate, octyl benzenesulfonate, and phenyl benzenesulfonate. , Methyl p-toluenesulfonate, ethyl p-toluenesulfonate, propyl p-toluenesulfonate, butyl p-toluenesulfonate, octyl p-toluenesulfonate, phenyl p-toluenesulfonate, methyl naphthalenesulfonate, naphthalenesulfone Ethyl acetate, propyl naphthalenesulfonate, butyl naphthalenesulfonate, 2-phenyl-2-propyl dodecylbenzenesulfonate, 2-phenyl-2-butyl dodecylbenzenesulfonate, etc. It can be.

Examples of the organic sulfonic acid phosphonium salt that can be used as the component (G) of the present invention include octylsulfonic acid tetrabutylphosphonium salt, decylsulfonic acid tetrabutylphosphonium salt, benzenesulfonic acid tetrabutylphosphonium salt, and dodecylbenzenesulfonic acid. Examples thereof include tetraethylphosphonium salt, tetrabutylphosphonium dodecylbenzenesulfonate, tetrahexylphosphonium dodecylbenzenesulfonate, tetraoctylphosphonium dodecylbenzenesulfonate, and the like.
Examples of the organic sulfonate ammonium salt that can be used as the component (G) of the present invention include decyl ammonium butyl sulfate, decyl ammonium decyl sulfate, dodecyl ammonium methyl sulfate, dodecyl ammonium ethyl sulfate, dodecyl methyl ammonium methyl sulfate, and dodecyl dimethyl. Ammonium tetradecyl sulfate, tetradecyl dimethyl ammonium methyl sulfate, tetramethyl ammonium hexyl sulfate, decyl trimethyl ammonium hexadecyl sulfate, tetrabutyl ammonium dodecyl benzyl sulfate, tetraethyl ammonium dodecyl benzyl sulfate, tetramethyl ammonium dodecyl benzyl sulfate, etc. Door can be.
Furthermore, in the present invention, the organic sulfonic acid preferably used as the component (G) includes an —OH group, —NH ₂ group, —COOH group, halogen group, etc. in addition to —SO ₃ H group in the molecular structure. For example, naphthol sulfonic acid, sulfamyl acid, naphthylamine sulfonic acid, sulfobenzoic acid, fully substituted or partially substituted chloro group-containing organic sulfonic acid, fully substituted or partially substituted fluoro group Examples thereof include organic sulfonic acids.

As the component (G) used in the present invention, an aromatic sulfonic acid compound is particularly preferable, and benzenesulfonic acid, p-toluenesulfonic acid, naphthalenesulfonic acid, and the like can be given as the most preferable examples.
When using a component (G) in this invention, the usage-amount is 0.001-5 weight part normally with respect to 100 weight part of component (A), More preferably, 0.01- 3 parts by weight, more preferably 0.05 to 2 parts by weight, particularly preferably 0.1 to 1 part by weight. The amount (parts by weight) of component (G) in the composition of the present invention is such that when the pH value of the mixture of component (F) and component (G) is measured based on JIS-K-5101, It is particularly preferable that the pH value of the mixture is in the range of 4 to 8 parts by weight.
That is, the optimal amount of component (G) used in the present invention varies depending on the shape and amount of component (F) or the type of component (F).
The amount of component (G) used is such that when the pH value of a mixture of component (F) and component (G) is measured based on JIS-K-5101, the pH value of the mixture is 4.2 to 7.8. More preferably, the number of parts by weight is in the range of 4.5 to 7.6, more preferably the number of parts by weight in the range of 5.0 to 7.4. Particularly preferred is the number of parts by weight in the range of 5.5 to 7.2.
In the measurement of the pH value of JIS-K-5105 according to the present invention, there are a boiling method and a room temperature method as an operation method, but the boiling method is used in the present invention.
In the measurement of the pH value of the mixture of component (F) and component (G) in the present invention, when the solubility of component (G) in water is low, alcohols such as ethanol and isopropyl alcohol are dispersed in the suspension. Used as a medium.

In this invention, it is preferable that the resin composition which comprises a molded object further contains an organic phosphorus stabilizer. By blending the organophosphorus compound, the thermal stability of the resin composition can be improved, and the color tone stability, moist heat resistance, heat discoloration resistance, and molding processing characteristics can be improved.
As such an organic phosphorus stabilizer, phosphate ester, phosphite ester, phosphonate ester and the like can be used.
Specific examples of the phosphate ester include tributyl phosphate, triethyl phosphate, trimethyl phosphate, triphenyl phosphate, diphenyl monooxoxenyl phosphate, dibutyl phosphate, dioctyl phosphate, and diisopropyl phosphate.
Specific examples of phosphites include triphenyl phosphite, tris (nonylphenyl) phosphite, tridecyl phosphite, trioctyl phosphite, trioctadecyl phosphite, didecyl monophenyl phosphite, dioctyl mono Phenyl phosphite, diisopropyl monophenyl phosphite, monobutyl diphenyl phosphite, monodecyl diphenyl phosphite, monooctyl diphenyl phosphite, tris (2,4-di-tert-butylphenyl) phosphite, bis (2,6- Di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, 2,2-methylenebis (4,6-di-tert-butylphenyl) octyl phosphite, bis (nonylphenyl) pentaeryth Diphosphite, bis (2,4-di -tert- butylphenyl) pentaerythritol diphosphite can be exemplified distearyl pentaerythritol diphosphite.

Specific examples of the phosphonic acid ester include tetrakis (2,4-di-iso-propylphenyl) -4,4′-biphenylenediphosphonite, tetrakis (2,4-di-n-butylphenyl) -4. , 4′-biphenylenediphosphonite, tetrakis (2,4-di-tert-butylphenyl) -4,4′-biphenylenediphosphonite, tetrakis (2,4-di-tert-butylphenyl) -4,3 '-Biphenylenediphosphonite, tetrakis (2,4-di-tert-butylphenyl) -3,3'-biphenylenediphosphonite, tetrakis (2,6-di-iso-propylphenyl) -4,4'- Biphenylene diphosphonite, tetrakis (2,6-di-n-butylphenyl) -4,4′-biphenylene diphosphonite, tetrakis (2, 6-di-tert-butylphenyl) -4,4′-biphenylenediphosphonite, tetrakis (2,6-di-tert-butylphenyl) -4,3′-biphenylenediphosphonite, tetrakis (2,6- Di-tert-butylphenyl) -3,3'-biphenylenediphosphonite, bis (2,4-di-tert-butylphenyl) -biphenylphosphonite, dimethyl benzenephosphonate, diethylbenzenephosphonate, dipropylbenzenephosphonate Can be illustrated.
Of these, tris (2,4-di-tert-butylphenyl) phosphite and tetrakis (2,4-di-tert-butylphenyl) -4,4′-biphenylenediphosphonite are particularly preferable. And bis (2,4-di-tert-butylphenyl) -biphenylphosphonite.
The amount of the organophosphorus stabilizer used is usually preferably 0.001 to 0.5 parts by weight, more preferably 0.01 to 0.3 parts by weight, with respect to 100 parts by weight of the component (A), and 0.02 -0.2 weight part is further more preferable. Moreover, these organic phosphorus stabilizers may be used alone or in combination of two or more.

In this invention, the resin composition which comprises a molded object can contain a ultraviolet absorber further, and can thereby improve light resistance.
Examples of such ultraviolet absorbers include benzophenone-based ultraviolet absorbers represented by 2,2′-dihydroxy-4-methoxybenzophenone, 2- (4,6-diphenyl-1,3,5-triazin-2-yl)- Triazine-based ultraviolet absorbers typified by 5-hexyloxyphenol, 2- (2H-benzotriazol-2-yl) -4-methylphenol, 2- (2H-benzotriazol-2-yl) -4-tert- Octylphenol, 2- (2H-benzotriazol-2-yl) -4,6-bis (1-methyl-1-phenylethyl) phenol, 2- (2H-benzotriazol-2-yl) -4,6-di -Tert-pentylphenol, 2- (5-chloro-2H-benzotriazol-2-yl) -4-methyl-6-tert-butyl Phenol, 2- (5-chloro-2H-benzotriazol-2-yl) -2,4-tert-butylphenol and 2,2′-methylenebis [6- (2H-benzotriazol-2-yl) -4- ( 1,1,3,3-tetramethylbutyl) phenol] and the like are exemplified, and these may be used alone or in combination of two or more.
The amount of the ultraviolet absorber used is usually preferably 0.001 to 1 part by weight, more preferably 0.01 to 0.8 part by weight, and 0.05 to 0. 0 part by weight with respect to 100 parts by weight of the component (A). 5 parts by weight is more preferable.

In this invention, the resin composition which comprises a molded object can contain a fluorescent whitening agent further. The fluorescent whitening agent has an action of absorbing energy in the ultraviolet part of light and radiating this energy to the visible part, and can improve the color tone of the resin composition to white or bluish white.
Examples of such fluorescent brighteners include stilbenzene, benzimidazole, benzoxazole, naphthalimide, rhodamine, coumarin, and oxazine compounds.
The amount of the fluorescent whitening agent used is usually preferably 0.0005 to 0.1 parts by weight, more preferably 0.001 to 0.05 parts by weight, and more preferably 0.003 to 100 parts by weight of the component (A). -0.03 weight part is still more preferable.
Moreover, in the resin composition which comprises the molded object of this invention, a lubricant, a mold release agent, antioxidant, an antistatic agent etc. can also be added as needed.

Next, the manufacturing method of the resin composition concerning this invention is demonstrated.
The resin composition according to the present invention can be obtained by blending each constituent component in the composition ratio described in the present specification and melt-kneading using a melt-kneading apparatus such as an extruder. At this time, blending of each component and melt kneading use a commonly used device, for example, a premixing device such as a tumbler or ribbon blender, a melt kneading device such as a single screw extruder, a twin screw extruder, or a kneader. I can do it. The raw materials can be supplied to the melt-kneading apparatus after mixing each component in advance, but it is also possible to supply each component independently to the melt-kneading apparatus.
As a melt-kneading apparatus for producing the resin composition according to the present invention, an extruder, preferably a twin-screw extruder is usually used. The melt-kneading can usually be carried out by appropriately setting the cylinder set temperature of the extruder to 200 to 300 ° C., preferably 220 to 270 ° C., and appropriately selecting the screw speed of the extruder from 100 to 700 rpm, preferably from 200 to 500 rpm. However, care should be taken not to give excessive heat during melt kneading. Furthermore, it is also effective to provide an opening in the latter part of the extruder and perform open devolatilization and, if necessary, vacuum devolatilization. Further, the residence time of the raw material resin in the extruder is usually selected appropriately within a range of 10 to 60 seconds.

The molding method for obtaining the molded product of the present invention is not particularly limited, and examples thereof include injection molding, extrusion molding, compression molding, rotational molding, blow molding, etc. Among them, injection molding and extrusion molding are preferably used.
When the molded product of the present invention is molded by injection molding, not only a normal molding method, but also injection compression molding, injection press molding, gas assist injection molding, foam molding (including those by supercritical fluid injection), A molded product can be obtained using an injection molding method such as insert molding, in-mold coating molding, heat-insulating mold molding, rapid heating / cooling mold molding, two-color molding, sandwich molding, or ultrahigh-speed injection molding. For injection molding, either a cold runner method or a hot runner method can be selected.
In the case of injection molding, as a special technique for increasing the fluidity of the resin, a method of improving the fluidity of the molten resin by dissolving nitrogen or carbon dioxide as a plasticizer in the molten resin may be used. Nitrogen and carbon dioxide may be appropriately injected by providing a vent portion in an injection molding machine cylinder. In order to improve transferability of molded products, or to prevent defects in appearance (swirl marks) when filling the mold with a resin in which nitrogen or carbon dioxide is dissolved in the molten resin, the molten resin is used as a mold. Before filling into the mold, the mold may be filled with nitrogen gas or carbon dioxide in advance. In this case, carbon dioxide is preferably used for the purpose of improving transferability.

Moreover, when shape | molding the molded object of this invention by extrusion molding. It can also be used in the form of various profile extrusion moldings, sheets, films and the like. For forming sheets and films, an inflation method, a calendar method, a casting method, or the like can be used.
When the molded article of the present invention is a sheet or film-like extruded molded article, the thickness is preferably 0.01 to 10 mm, more preferably 0.1 to 5 mm, still more preferably 0.15 to 3 mm, and 2 to 2 mm is particularly preferable.
Furthermore, the molded body comprising the aromatic polycarbonate resin composition of the present invention preferably achieves any flame retardancy of 5V, V-0, V-1 by a test method according to the UL94 standard, in particular 5V, It is preferable to achieve V-0.
Since the molded body of the present invention can prevent light leakage from the light source and suppress light loss, it is possible to construct a lighting device or a liquid crystal backlight unit having excellent luminance. In addition, the molded article of the present invention is excellent in properties such as mechanical strength, color tone stability and flame retardancy, and has very high industrial significance.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
In Examples or Comparative Examples, the following components were used to produce a thermoplastic resin composition.
1. Component (A): Thermoplastic resin (A-1) Aromatic polycarbonate A bisphenol A polycarbonate produced from bisphenol A and diphenyl carbonate by the melt transesterification method, and octadecyl-3-as a hindered phenol antioxidant. One containing 500 ppm of (3,5-di-t-butyl-4-hydroxyphenyl) propionate and 500 ppm of tris (2,4-di-t-butylphenyl) phosphite as a phosphite heat stabilizer.
Weight average molecular weight (Mw) = 22,500
2. Component (B): Titanium oxide (B-1)
Rutile-type titanium dioxide produced by the sulfuric acid method and alumina-treated titanium dioxide (B-2) having a primary average particle size of 0.22 μm
2. Rutile-type titanium dioxide produced by a chlorine method, treated with alumina having a primary average particle size of 0.21 μm, and then surface-treated with methyl hydrogen polysiloxane. Component (C): Dyeing pigment (C-1)
“Mitsubishi Carbon No. 52 (registered trademark)” manufactured by Mitsubishi Chemical Corporation
(C-2)
Made by Bayer Corporation; “Macrolex Blue RR (registered trademark)”

4). Ingredient (D): Flame retardant (D-1)
Perfluorobutanesulfonic acid potassium salt (“Mega-Fuck F114 (registered trademark)” manufactured by Dainippon Ink Industries, Ltd.)
(D-2)
Aromatic condensed phosphoric acid ester (“PX-200” (registered trademark), manufactured by Daihachi Chemical Co., Ltd.)
5. Component (E): Fluoropolymer (E-1)
50/50 (weight ratio) powdered mixture of polytetrafluoroethylene (PTFE) and polymethyl methacrylate (PMMA) (“Metbrene A-3800 (registered trademark)” manufactured by Mitsubishi Rayon Co., Ltd.)
6). Component (F): Silicate compound (F-1)
Made by Nippon Talc Co., Ltd. “Microace P3 (registered trademark)”
7). Component (G): Organic acidic compound and / or organic acidic compound derivative (G-1)
p-toluenesulfonic acid; manufactured by Wako Pure Chemical Industries, Ltd. Other ingredients:
(PETS)
Pentaerythritol tetrastearate (“Unistar H476 (registered trademark)” manufactured by NOF Corporation)

[Examples 1 to 6 and Comparative Examples 1 to 3]
Each component was melt kneaded in the amounts shown in Table 1 (units are parts by weight) using a twin screw extruder to obtain a resin composition.
Each component was premixed for 5 minutes in advance using a tumbler to obtain a powder raw material mixture. Thereafter, using a twin screw extruder (ZSK-25, L / D = 37, manufactured by Werner & Pfleiderer), melt kneading was performed under conditions of a cylinder set temperature of 250 ° C. and a screw rotation speed of 150 rpm.
The melt-kneaded resin composition is extruded into a strand shape and pelletized. A molded body was prepared from the obtained pellets and used for each evaluation.
The molded bodies of Examples 1 to 5 were molded by injection molding.
The molded body of Example 6 was obtained by drying pellets of the resin composition at 120 ° C. for 4 hours, and using a 65 mm single-screw extruder (GM Engineering Co., Ltd., GM65-25) equipped with a T die, a cylinder set temperature of 270 ° C. The sheet was molded under the conditions of a screw rotation speed of 15 rpm and a discharge amount of 10 to 15 kg / hr. The T die had a slit width of 0.5 to 2 mm and a slit length of 380 mm. The sheet extruded from the T-die was adjusted with a roll in a range of roll rotation speed of 0.8 to 1.2 m / min to obtain a sheet with a desired thickness while balancing the discharge amount.

(1) Reflectance measurement With an injection molding machine (Autoshot 100D, manufactured by FANUC) set at a cylinder temperature of 280 ° C. and a mold temperature of 80 ° C., the thickness is 50 mm (width) × 90 mm (length), and the thickness is 3 mm. 3 mm plates of 2 mm and 1 mm were formed.
The light reflectance at a wavelength of 550 nm was measured using a spectrophotometer UV-3150 manufactured by Shimadzu Corporation for the 2 mm thick portion of the three-stage plate.
About Example 6, it measured using the sheet | seat of thickness 2mm.
(2) Light-shielding property measurement All light transmission using COLOR AND COLOR DIFFERENCE METER MODEL 1001DP made by Nippon Denshoku Industries Co., Ltd. for the 2 mm thickness part and 1 mm thickness part of the three-stage plate used in the reflectance measurement. Rate (T) [unit%] was measured.
About Example 6, it measured using the sheet | seat of thickness 2mm and 1mm.
(3) Heat-resistant discoloration The three-stage plate used in the reflectance measurement was held in an oven set at 100 ° C. for 100 hours, and the color difference change (ΔE _ab ^* ) from the initial hue was measured. Judged.
○: ΔE _ab ^* is 1 or less.
X: ΔE _ab ^* exceeds 1.

(4) Flame retardance A strip-shaped molded product for a combustion test is molded by an injection molding machine and held in an environment of a temperature of 23 ° C. and a humidity of 50% for 2 days, and then a vertical combustion test is performed according to the UL94 standard. It was classified into 5VB, V-0, V-1, and V-2.
(5) Dirt impact strength Using the 2mm thick part of the three-stage plate used in the reflectivity measurement, Instrumented Falling Weight Tester Type 5 HV manufactured by Rosand, missile diameter 10mm, falling weight height 100cm The dart impact strength was measured under the conditions of a missile speed of 6 m / s and a temperature of 23 ° C.
○: Missile is non-penetrating or penetrates by ductile destruction.
X: The missile penetrates by brittle fracture.
The results are shown in Tables 1 and 2.

  Since the molded body of the present invention can prevent light leakage from the light source and suppress light loss, it is possible to construct a lighting device or a liquid crystal backlight unit having excellent luminance. In addition, the molded article of the present invention is excellent in properties such as mechanical strength, color tone stability and flame retardancy, and has very high industrial significance.

Claims (10)

  Resin containing titanium oxide (B) 3 to 30 parts by weight, dye / pigment (excluding component (B)) (C) 0.0001 to 0.1 parts by weight per 100 parts by weight of thermoplastic resin (A) A molded article comprising the composition, wherein the resin composition constituting the molded article has a total light reflectance (R) [unit:%] measured according to JIS-K-7105 of 50% or more, And the molded object characterized by the total light transmittance (T) [unit:%] at a thickness of 2 mm being 0.1% or less.   The molded article according to claim 1, wherein the thermoplastic resin (A) is an aromatic polycarbonate or a resin mainly composed of an aromatic polycarbonate.   The molded body according to claim 1 or 2, wherein the resin composition constituting the molded body further contains 0.001 to 30 parts by weight of a flame retardant (D).   The resin composition which comprises this molded object contains 0.01-1 weight part of fluoropolymers (E) further, The molded object in any one of Claims 1-3 characterized by the above-mentioned.   The molded article according to claim 3 or 4, wherein the flame retardant (D) is at least one organic acid metal salt selected from organic acid alkali metal salts and organic acid alkaline earth metal salts.   The resin composition constituting the molded body is an aromatic polycarbonate or 100 parts by weight of a resin (component (A)) mainly composed of an aromatic polycarbonate, 3 to 30 parts by weight of titanium oxide (component (B)), a dye pigment ( However, except component (B)) (component (C)) 0 to 0.1 parts by weight, at least one organic acid metal salt selected from organic acid alkali metal salt and organic acid alkaline earth metal salt (component (D 2) The molded article according to claim 1, which is an aromatic polycarbonate resin composition containing 0.001 to 1 part by weight and 0.01 to 1 part by weight of a fluoropolymer (component (E)).   The resin composition constituting the molded body is an aromatic polycarbonate resin composition further containing 0.1 to 30 parts by weight of a silicate compound (component (F)). The molded object in any one.   The resin composition constituting the molded body is an aromatic polycarbonate resin composition further containing 0.001 to 5 parts by weight of an organic acidic compound and / or an organic acidic compound derivative (component (G)). The molded product according to claim 7.   The molded body according to any one of claims 1 to 8, wherein the molded body is an injection molded body or an extrusion molded body.   The molded body according to claim 9, wherein the molded body is a frame molded body for a liquid crystal backlight unit.