JP4550474B2 - Aromatic polycarbonate resin composition and molded article - Google Patents

Description

  The present invention relates to a flame-retardant aromatic polycarbonate resin composition and a molded article excellent in light reflectivity, light shielding property, surface appearance, rigidity, bending strength, and melt stability. More specifically, the present invention relates to a flame retardant aromatic polycarbonate resin composition and a molded body which are excellent in these characteristics even when formed into a thin molded body, and are particularly suitable for use as a molded article for a reflector.

  Aromatic polycarbonate is a resin material with excellent mechanical properties such as impact resistance and heat resistance, so it can be used as a housing for office equipment such as computers, notebook computers, printers, word processors, copiers, projectors, etc. Widely used in backlight unit parts for liquid crystal displays.

  In recent years, these products have been required to have a thin design for the purpose of miniaturization and weight reduction. In the case of a thin-wall design, it is required to improve the rigidity of the resin composition used in the product in order to increase the rigidity of the product.

  Conventionally, methods for blending glass fiber, talc, mica, wollastonite and the like into polycarbonate have been widely used to improve the rigidity of aromatic polycarbonate materials. However, when various reinforcing materials and / or fillers are blended with the aromatic polycarbonate, particularly when a basic inorganic compound such as talc or mica is blended, the melt stability of the aromatic polycarbonate is large. There is a problem that the mechanical strength of the product is greatly reduced.

  Further, in the case of a thin design, since the product thickness is small, there is often a problem that the light concealment and light reflectivity are insufficient. For example, for products such as backlight reflectors for liquid crystal displays, it is required to reflect the backlight without loss, but when it is designed to be thin, the backlight is said to have insufficient light shielding properties. There is a problem that the light is easily leaked and the light reflectivity is lowered. For this reason, the resin composition used in the product is required to have sufficient light hiding and light reflecting properties at the same time.

  In order to improve the light hiding and light reflectivity of the aromatic polycarbonate resin composition, a method of blending a colorant such as titanium oxide is generally used. In recent examples, Patent Documents 1 to 4 are listed. Can do. However, in the conventional method in which the improvement of the light shielding property and the light reflecting property is achieved only by adding titanium oxide, a large amount of titanium oxide is added to the aromatic polycarbonate in order to provide sufficient light shielding property and light reflecting property. It was necessary to mix. In addition, the blending of a large amount of titanium oxide has a problem that not only the melt stability of the aromatic polycarbonate is greatly lowered and the molecular weight of the aromatic polycarbonate is lowered, but also silver is easily generated during the molding process, resulting in poor appearance. . Furthermore, blending a large amount of titanium oxide makes the molded body very brittle, making it difficult to maintain sufficient strength as a product, especially in the case of thin molded bodies, the bending strength of the molded body is greatly reduced. For this reason, there is a problem that the molded body is easily broken during assembly and transportation of the product.

On the other hand, aromatic polycarbonate resin compositions used for OA equipment and electrical / electronic equipment are often required to have a high degree of flame retardancy at the same time. There is a need for a flame retardant aromatic polycarbonate resin composition that does not use a flame retardant.
However, materials that have high flame retardancy have been obtained so far, even in the case of thin molded articles, without using brominated flame retardants or phosphorous flame retardants for aromatic polycarbonates rich in titanium oxide. It wasn't.

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

  An object of the present invention is to provide a flame-retardant aromatic polycarbonate resin composition and a molded article excellent in light reflectivity, light concealability, surface appearance, rigidity, bending strength, and melt stability. The object of the present invention is to provide a flame-retardant aromatic polycarbonate resin composition and a molded article which are excellent in these characteristics even when formed into a thin molded article, and are particularly suitable for use as a molded article for a reflector.

As a result of intensive studies to solve the above-mentioned problems, the present inventors blended a silicate compound, an organic acidic compound and / or an organic acidic compound derivative in a predetermined usage amount with respect to the aromatic polycarbonate, By incorporating titanium oxide, it is surprising that the melt stability, light hiding property, and light reflectivity of the resin composition are dramatically improved, and at the same time, a resin composition having excellent appearance and bending strength can be obtained. The fact was discovered and it came to this invention.
That is, the present invention includes the following [1] to [9].

[1] Aromatic polycarbonate or 0.1 to 50 parts by weight of silicate compound (B), aromatic sulfonic acid compound and / or aromatic sulfone with respect to 100 parts by weight of resin (A) mainly composed of aromatic polycarbonate 0.001 to 5 parts by weight of acid compound derivative (C), 1 to 50 parts by weight of titanium oxide (D) , alkali metal salt of organic sulfonic acid and / or alkaline earth metal salt of organic sulfonic acid (E) 0.001 An aromatic polycarbonate resin composition comprising ˜1 part by weight and 0.01-1 part by weight of fluoropolymer (F).
[2] weight parts of said aromatic sulfonic acid compound and / or aromatic sulfonic acid compound derivative (C) is, the pH value on the basis of a mixture of the JIS K5101該珪acid salt compound (B) and the component (C) The aromatic polycarbonate resin composition according to the above [1], wherein when measured, the pH value of the mixture is in the range of 4 to 8 parts by weight.
[3] The above-mentioned [1], [2], wherein the silicate compound (B) is one or more selected from the group consisting of talc, mica, and wollastonite. Aromatic polycarbonate resin composition.

[4] The aromatic polycarbonate resin composition according to [1] or [2], wherein the silicate compound (B) is talc and / or mica.
[ 5 ] The aromatic polycarbonate resin composition as described in [1] to [ 4 ] above, wherein the titanium oxide (D) is titanium oxide surface-treated with alumina and / or silica.
[ 6 ] The above-mentioned [1] to [ 5 ], wherein the titanium oxide (D) is titanium oxide surface-treated with alumina and / or silica and then surface-treated with an organosiloxane compound. Aromatic polycarbonate resin composition.
[ 7 ] The aromatic polycarbonate resin composition according to [1] to [ 6 ], wherein the titanium oxide (D) has a primary average particle size of 0.1 to 0.3 μm.
[ 8 ] A molded product formed by molding the aromatic polycarbonate resin composition according to [1] to [ 7 ].
[ 9 ] A molded article for a reflector, formed by molding the aromatic polycarbonate resin composition according to [1] to [ 7 ].
[ 10 ] The reflector molded product according to [ 9 ] above, which is a backlight reflector.

  The aromatic polycarbonate fat composition and molded product of the present invention are a flame retardant aromatic polycarbonate resin composition and molding excellent in light reflectivity, light hiding property, surface appearance, rigidity, bending strength, and melt stability. More specifically, it is a flame retardant aromatic polycarbonate resin composition excellent in these characteristics even when it is a thin molded article, and particularly suitable for use as a molded article for a reflector, and a molded article. It is extremely useful industrially.

The present invention will be specifically described below.
In the present invention, the component (A) is an aromatic polycarbonate or a resin mainly composed of an aromatic polycarbonate.
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 manufactured by methods such as .

  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 = 0.3591 M _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 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 acryl. Rate-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 resin mainly composed of the polycarbonate, the amount of the thermoplastic resin other than the aromatic polycarbonate is preferably 0.1 to 30 parts by weight, more preferably 0.1 parts by weight based on 100 parts by weight of the total amount of the component (A). 5 to 20 parts by weight, more preferably 1 to 15 parts by weight.
The component (B) used in the present invention is a silicate compound, which is a silicate compound comprising a metal oxide component and a SiO ₂ component. The silicate compound that can be used as the component (B) may have any form of silicate ions such as orthosilicate, disilicate, cyclic silicate, chain silicate, layered silicate, and the like.

  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 form of crystal water in the hydrate is contained as hydrogen silicate ions as Si—OH , contained ionically as hydroxide ions (OH—) with respect to metal cations, and contained as water molecules in the gaps in the structure. Any of these may be used.

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 (B) of the present invention 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.
Preferred as the metal oxide MO 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 (B) of the present invention include talc, mica, wollastonite, zonotlite, kaolin clay, montmorillonite, bentonite, sepiolite, imogolite, sericite, lawsonite, smectite, and the like. Can be mentioned.

  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 (B) 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 (B) is preferably 0.001 to 500 μm, more preferably 0.01 to 100 μm, still more preferably 0.1 to 50 μm, particularly preferably 0.5 to 30 μm. Most preferred is ˜20 μm.

In addition, the average particle diameter as used in the field of this invention is measured using the following method with the distribution range of the approximate particle diameter of a component (B).
When the particle diameter of the component (B) is distributed in the range of approximately 0.001 to 0.1 μm, take an observation photograph of a transmission electron microscope, and determine the area S of the particles for 100 or more particles. (4S / π) ⁰ . ⁵ is determined as the particle diameter of each particle, and the number average particle diameter is determined.
When the particle diameter of the component (B) is distributed in the range of about 0.1 to 300 μm, the average particle diameter is determined by laser diffraction (for example, using SALD-2000 manufactured by Shimadzu Corporation).

Of the silicate compounds that can be used as the component (B) of the present invention, particularly preferred are talc and mica.
Talc that can be particularly preferably used as the component (B) of the present invention is a hydrous magnesium silicate having a layered structure, represented by the chemical formula 4SiO ₂ .3MgO · H ₂ O, and usually about ₂ wt% of SiO ₂ , It contains about 32% by weight of MgO, about 5% by weight of H ₂ O, other Fe ₂ O ₃ , CaO, Al ₂ O _{3 and the} like, and the specific gravity is about 2.7.

  In addition, as the talc that can be particularly preferably used as the component (B) 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 (B) 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) and 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.

In this invention, the usage-amount of a component (B) is 0.1-50 weight part with respect to 100 weight part of components (A), 0.5-30 weight part is preferable, and 1-25 weight part is more preferable. 3 to 20 parts by weight is more preferable, and 5 to 15 parts by weight is particularly preferable.
When the amount of the component (B) used exceeds 50 parts by weight, the melt stability is lowered, and the appearance and mechanical properties of the product are greatly reduced. On the other hand, when the amount is less than 0.1 parts by weight, the flame retardancy is reduced. It tends to decrease.

Component (C) used in the present invention is an organic acidic compound and / or an organic acidic compound derivative.
Specific examples of the component (C) 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. .

In the present invention, it is extremely important to use the component (B) and the component (C) in combination. By using the component (C), not only the light reflectivity and the light concealability but also the difficulty of the resin composition. Flame retardancy and melt stability can be dramatically improved.
Furthermore, even when the molecular weight of the aromatic polycarbonate to be used is reduced to improve the melt fluidity, it is possible to obtain a good product bending strength that cannot be achieved conventionally.

  In the present invention, the amount of the component (C) used relative to the component (B) is also very important. Even if the amount of the component (C) is too small or excessive with respect to the component (B), the present invention is excellent. It becomes difficult to obtain an effect, that is, high flame retardancy and excellent melt stability.

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.

Further, "an organic sulfonic acid compound derivative" in the present invention shall mean the organic sulfonic acid ester derived from an organic sulfonic acid, organic sulfonic acid anhydride, organic sulfonic acid phosphonium salt, an organic acid ammonium salt .
As the “ organic sulfonic acid compound and / or organic sulfonic acid compound derivative (C)”, not only a low-molecular compound but also an oligomer or polymer can be used.

In the present invention, the component (C) can be used in combination of two or more.
As component (C) of the present invention, an organic sulfonic acid derivative selected from organic sulfonic acid and / or organic sulfonic acid ester, organic sulfonic acid phosphonium salt, organic sulfonic acid ammonium salt, and organic carboxylic acid are preferably used. it can.

  In particular, when organic sulfonic acid or organic sulfonic acid ester is used as the component (C), 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 organic sulfonic acid that can be preferably used as the component (C) of the present invention, benzenesulfonic acid, p-toluenesulfonic acid, xylenesulfonic acid, naphthalenesulfonic acid, diisopropylnaphthalenesulfonic acid, diisobutylnaphthalenesulfonic acid, dodecylbenzene Examples include aromatic sulfonic acids such as sulfonic acids, aliphatic sulfonic acids having 8 to 18 carbon atoms, sulfonated polystyrene, polymers such as methyl acrylate / sulfonated styrene copolymers, and oligomeric organic sulfonic acids. Can do.

  Examples of the organic sulfonic acid ester that can be used as the component (C) 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.

  Moreover, as the organic sulfonic acid phosphonium salt that can be used as the component (C) of the present invention, octylsulfonic acid tetrabutylphosphonium salt, decylsulfonic acid tetrabutylphosphonium salt, benzenesulfonic acid tetrabutylphosphonium salt, dodecylbenzenesulfonic acid Examples thereof include tetraethylphosphonium salt, tetrabutylphosphonium dodecylbenzenesulfonate, tetrahexylphosphonium dodecylbenzenesulfonate, tetraoctylphosphonium dodecylbenzenesulfonate, and the like.

  Examples of the organic sulfonic acid ammonium salt that can be used as the component (C) 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 (C) is 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 (C) 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.

In the present invention, the amount of the organic acidic compound and / or organic acidic compound derivative (C) used is:
It is 0.001-5 weight part with respect to 100 weight part of component (A), Preferably it is 0.01-3 weight part, More preferably, it is 0.05-2 weight part, Especially preferably, it is 0.1-0.1 weight part. 1 part by weight. When the amount of component (C) used is less than 0.001 part by weight, the effect of improving the melt stability is insufficient, whereas when it exceeds 5 parts by weight, the melt stability of the resin composition tends to be lowered. is there.

The amount (parts by weight) of component (C) used in the composition of the present invention is such that when the pH value of the mixture of component (B) and component (C) is measured based on JIS K5101, the pH of the mixture Particularly preferred is the number of parts by weight in which the value is in the range of 4-8.
That is, the optimal usage amount of the component (C) in the present invention varies depending on the type, shape and amount of the component (B) or the type of the component (C).

The amount of component (C) used is such that when the pH value of the mixture of component (B) and component (C) is measured based on JIS K5101, the pH value of the mixture is in the range of 4.2 to 7.8. Is more preferable, the case of being in the range of 4.5 to 7.6 is more preferable, the case of being in the range of 5.0 to 7.4 is particularly preferable, Most 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 K5105 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 (B) and component (C) in the present invention, if the solubility of component (C) in water is low, alcohols such as ethanol and isopropyl alcohol are dispersed in the suspension. Used as a medium.

  Component (D) used in the present invention is titanium oxide, particularly preferably titanium dioxide. The primary particle size of titanium oxide is preferably 0.05 to 0.5 μm, more preferably 0.1 to 0.4 μm, and still more preferably 0.15 to 0.3 μm.

  The titanium oxide used in the present invention is preferably surface-treated within a range not impairing the object of the present invention. The surface treatment agent is preferably one that has been surface-treated with a hydrous oxide such as alumina and / or silica, an amine compound such as triethanolamine, a polyol compound such as trimethylolethane, among which alumina and / or Those treated with a hydrous oxide such as silica are preferred. More preferably, those further treated with an organic siloxane compound such as alkylpolysiloxane, alkylarylpolysiloxane, alkylhydrogenpolysiloxane, silane coupling agent such as alkyltrimethoxysilane, γ-aminopropyltriethoxysilane, Particularly preferred surface treatment agents include polyorganohydrogensiloxanes such as alkylhydrogenpolysiloxanes and alkylhydrogenpolycyclosiloxanes.

  Examples of the surface treatment method include a wet method and a dry method. In the wet method, titanium oxide is added to a mixed solution of a surface treatment agent and a low-boiling solvent, and after stirring, the solvent is removed. Thereafter, further heat treatment at 100 ° C. to 300 ° C. is preferable for improving the dispersibility of titanium oxide. In the dry method, the surface treatment agent and titanium oxide are mixed in a mixer such as a Henschel mixer or tumbler, or the surface treatment agent is dissolved in a solvent, or the dispersed mixed solution is sprayed onto titanium oxide. . Thereafter, further heat treatment at 100 ° C. to 300 ° C. is preferable because the dispersibility of titanium oxide is further improved. By performing such a surface treatment, it is possible to suppress deterioration of physical properties of the aromatic polycarbonate resin composition, further improve dispersibility of the titanium oxide in the resin composition, and suppress molding defects such as silver. .

As the method for producing titanium oxide, those produced by either sulfuric acid method or chlorine method can be used.
The crystal structure of titanium oxide can be either a rutile type or an anatase type, but the rutile type is more preferable from the viewpoint of the thermal stability, light resistance, etc. of the aromatic polycarbonate resin composition.

The amount of component (D) in the present invention is 1 to 50 parts by weight, preferably 1 to 30 parts by weight, more preferably 3 to 20 parts by weight, based on 100 parts by weight of component (A). Preferably it is 4-15 weight part, Most preferably, it is 5-13 weight part.
When the usage-amount of a component (D) exceeds 50 weight part, it exists in the tendency for the impact resistance of a resin composition, an elongation characteristic, a flame retardance, etc. to fall. On the other hand, when the amount is less than 1 part by weight, the light reflectivity and the light concealability tend to be insufficient.

Component (E) used in the present invention is at least one metal salt selected from an organic alkali metal salt and an organic alkaline earth metal salt. In the present invention, in particular, a metal salt of an organic sulfonic acid, and / or A metal salt of a sulfate ester can be preferably used. Moreover, these can be used not only independently but in mixture of 2 or more types.
The alkali metal used in the present invention includes lithium, sodium, potassium, rubidium and cesium, and the alkaline earth metal includes beryllium, magnesium, calcium, strontium and barium, particularly preferably lithium, Sodium and potassium are preferable, and sodium and potassium are most preferable.

  Examples of the metal salt of the organic sulfonic acid that can be preferably used in the present invention include aliphatic sulfonate alkali (earth) metal salts and aromatic sulfonate alkali (earth) metal salts. In the present specification, the expression “alkali (earth) metal salt” is used to mean both alkali metal salts and alkaline earth metal salts.

  As the aliphatic (alkali earth) metal salt of an aliphatic sulfonate, an alkane sulfonic acid alkali (earth) metal salt having 1 to 8 carbon atoms or a part of the alkyl group of the alkane sulfonic acid alkali (earth) metal salt includes Alkali (earth) metal sulfonates substituted with fluorine atoms, and alkali (earth) metal perfluoroalkane sulfonates having 1 to 8 carbon atoms can be preferably used. Fluoroethanesulfonic acid sodium salt and perfluorobutanesulfonic acid potassium salt can be mentioned.

  In addition, the alkali (earth) metal salt of an aromatic sulfonate includes, as an aromatic sulfonic acid, a monomeric or polymeric aromatic sulfide sulfonic acid, an aromatic carboxylic acid and its ester sulfonic acid, monomeric or polymer Aromatic ether sulfonic acid, aromatic sulfonate sulfonic acid, monomeric or polymeric aromatic sulfonic acid, monomeric or polymeric aromatic sulfonic acid, aromatic ketone sulfonic acid, heterocyclic sulfone Mentioning an alkali (earth) metal salt of an aromatic sulfonate having at least one selected from the group consisting of an acid, a sulfonic acid of an aromatic sulfoxide, and a condensate of an aromatic sulfonic acid by a methylene type bond. Can do.

Preferred examples of the above-mentioned monomeric or polymeric aromatic sulfonic acid alkali (earth) metal salts include diphenyl sulfide-4,4′-disulfonic acid disodium, diphenyl sulfide-4,4′-disulfone. Mention may be made of dipotassium acid.
Preferred examples of the sulfonic acid alkali (earth) metal salt of the aromatic carboxylic acid and its ester include potassium 5-sulfoisophthalate, sodium 5-sulfoisophthalate, and polysodium polyethylene terephthalate polysulfonate. be able to.

  Moreover, the sulfonate alkali (earth) metal salt of the monomeric or polymeric aromatic ether includes, as preferred examples 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 sulfonic-acid alkali (earth) metal salt of the said aromatic sulfonate can mention the potassium sulfonate of benzenesulfonate as the preferable example.
The monomeric or polymeric aromatic (earth) metal sulfonates 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 (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 above-mentioned aromatic sulfonate alkali (earth) metal salts of aromatic ketones include sodium α, α, α-trifluoroacetophenone-4-sulfonate and dipotassium benzophenone-3,3′-disulfonate. Can do.
Preferred examples of the above-mentioned alkali sulfonic acid alkali (earth) metal salt include disodium thiophene-2,5-disulfonate, dipotassium thiophene-2,5-disulfonate, and calcium thiophene-2,5-disulfonate. And sodium benzothiophene sulfonate.

As a preferable example of the sulfonic acid alkali (earth) metal salt of the aromatic sulfoxide, potassium diphenyl sulfoxide-4-sulfonate can be mentioned.
Preferable examples of the condensate obtained by methylene bond of the alkali (earth) metal salt of aromatic sulfonate include a formalin condensate of sodium naphthalene sulfonate and a formalin condensate of sodium anthracene sulfonate.

  On the other hand, as the alkali (earth) metal salt of a sulfate ester, a monovalent and / or alkali (earth) metal salt of a sulfate ester of a polyhydric alcohol 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 examples of the alkali (earth) metal salts of these sulfates include the alkali (earth) metal salts of lauryl sulfate.

  Examples of other alkali (earth) metal salts include alkali (earth) metal salts of aromatic sulfonamides such as saccharin, N- (p-tolylsulfonyl) -p-toluenesulfonimide, Examples thereof include N- (N′-benzylaminocarbonyl) sulfanilimide and alkali (earth) metal salts of N- (phenylcarboxyl) sulfanilimide.

  Among the components (E) listed above, more preferable alkali (earth) metal salts include alkali (earth) metal salts of aromatic sulfonic acid and alkali (earth) metal salts of perfluoroalkanesulfonic acid. Can be mentioned.

In this invention, the usage-amount of a component (E) is 0.001-1 weight part with respect to 100 weight part of components (A), 0.005-0.8 weight part is preferable, 0.01-0. 7 parts by weight is more preferred, 0.03 to 0.5 parts by weight is still more preferred, 0.05 to 0.3 parts by weight is particularly preferred, and 0.06 to 0.2 parts by weight is most preferred.
When the amount of the component (E) used exceeds 1 part by weight, the melt stability of the resin composition tends to be lowered, and it tends to be colored by melt-kneading. Tend to be insufficient.

Component (F) used in the present invention is a fluoropolymer, and is used for the purpose of preventing dripping of combustion products. The component (F) 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 (F), various forms of fluoropolymers such as fine powdery fluoropolymers, aqueous dispersions of fluoropolymers, and powdery mixtures with second resins such as AS and 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 (F). The technology relating to the fluoropolymer as a mixture is disclosed in JP-A-9-95583 (corresponding to US Pat. No. 5,804,654) and JP-A-11-49912 (corresponding to 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 Co., Ltd., “Metablene A-3800” manufactured by Mitsubishi Rayon Co., Ltd. Registered trademark) ”.

  The compounding quantity of the component (F) in this invention is 0.01-1 weight part with respect to 100 weight part of components (A), Preferably it is 0.05-0.8 weight part, More preferably, it is 0.1. It is -0.6 weight part, More preferably, it is 0.2-0.4 weight part.

  In the aromatic polycarbonate resin composition of the present invention, if necessary, colorants other than titanium oxide, lubricants, mold release agents, heat stabilizers, antioxidants, ultraviolet absorbers (light resistance agents), antistatic agents. Further, a fluorescent whitening agent or the like can be added.

Next, the manufacturing method of the aromatic polycarbonate resin composition of this invention is demonstrated.
The resin composition of the present invention is prepared by blending the above components (A) to (F) and, if necessary, other components in the composition ratio described in the present specification, and melt-kneading using a melt-kneader such as an extruder. Can be obtained. 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.

  In the production of the resin composition of the present invention, the component (B) is preliminarily composed of a covalent bond, an ionic bond, a molecule on the surface and inside of the component (B) by the organic acidic compound and / or the organic acidic compound derivative (C). It is more preferable to supply the melt-kneading apparatus after chemical or physical surface treatment via interstitial force or hydrogen bond.

  Examples of the method for subjecting component (B) to surface treatment with component (C) in advance include the following methods. A predetermined amount of component (C) is blended with respect to component (B), and component (C) is added by a method such as spraying, dropping, wetting, or dipping in a molten state, a solution state, or a gas state as necessary. The mixture is brought into contact with (B) and mixed and stirred using a mechanical mixing device such as a Henschel mixer, Nauter mixer, V blender, or tumbler. The mixing and stirring treatment may be performed at a temperature equal to or lower than the melting point of the component (C), but it is more effective to perform heating and heating to a temperature equal to or higher than the melting point of the component (C). Although the time required for the mixing and stirring treatment depends on the type of the mixing apparatus, it is usually 1 minute to 3 hours, preferably 2 minutes to 1 hour, more preferably 3 minutes to 40 minutes, and further preferably 5 minutes to 30 minutes. is there. As the mixing device, a Henschel mixer with a heating device or a Nauter mixer can be used particularly preferably. In addition, it is preferable that the excess component (C) is removed by devolatilization and / or heat treatment after the mixing and stirring treatment and sufficiently dried.

  As a melt-kneading apparatus for producing the resin composition of the present invention, an extruder, preferably a twin-screw extruder is usually used. Component (B) can also be side-fed from the middle of the extruder. 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 a molded product comprising the aromatic polycarbonate resin composition of the present invention is not particularly limited, and examples thereof include injection molding, gas assist molding, extrusion molding, compression molding, etc., among which injection molding and extrusion Molding is preferably used, and injection molding is particularly preferably used.

  Examples of molded products using the aromatic polycarbonate resin composition of the present invention include computers, notebook computers, copiers, printers, liquid crystal projectors, electric / electronic devices, mobile phones, personal digital assistants, battery packs, home appliances. Housing materials, backlight unit frame members, parts materials such as internal parts of copiers, resistors, terminals, TV / deflection yokes and other electrical / electronic parts materials, lighting parts materials, electronic / information equipment Examples include flame retardant sheets (insulating sheets) and the like, which can be suitably used particularly when light shielding properties are required.

  In addition, the aromatic polycarbonate resin composition of the present invention is excellent in light reflectivity, light concealment, surface appearance, rigidity and bending strength, so that it can be used in monitors, notebook computers, mobile phones, portable information terminals, It can be particularly preferably used for a molded product for a reflector for a backlight unit such as a car navigator.

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 (A), (B), (C), (D), (E), and (F) were used to produce aromatic polycarbonate resin compositions.

(1) Component (A): Aromatic polycarbonate (PC)
A bisphenol A polycarbonate produced from bisphenol A and diphenyl carbonate by a melt transesterification method, and octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) as a hindered phenol antioxidant ) One containing 300 ppm propionate and 150 ppm tris (2,4-di-t-butylphenyl) phosphite as a phosphite heat stabilizer.
Weight average molecular weight (Mw) = 19,800
Phenolic end group ratio (ratio of phenolic end groups to the total number of end groups) = 35 mol%

(2) Component (B): Silicate compound (talc)
Average particle size = 5.07 μm
Whiteness = 97.7%
Bulk specific volume = 2.3 ml / g
Specific surface area = 8.5 m ² / g
Moisture = 0.13%
Oil absorption = 51ml / 100g
pH = 9.2

The average particle size was measured by a laser diffraction method using a SALD-2000 analyzer manufactured by Shimadzu Corporation. The average particle diameter of talc was the median diameter.
The whiteness was measured by a measuring method based on JIS P8123, and measured with a digital hunter ST manufactured by Toyo Seiki Seisakusho.
The specific surface area was measured by a BET method using a gas phase adsorption method, and was measured using a flow soap 2300 manufactured by Shimadzu Corporation.
The moisture was measured by a measuring method based on JIS K5101 and measured using STAC-5100 manufactured by Shimadzu Corporation.
The oil absorption and the volume specific volume were measured by a measuring method based on JIS K5101.
The pH was measured by a pH measurement method based on JIS K5101 standard.

(3) Component (C): Organic acidic compound and / or organic acidic compound derivative (p-toluenesulfonic acid)
p-Toluenesulfonic acid Wako Pure Chemical Industries, Ltd.

(4) Component (D): Titanium oxide (titanium dioxide 1)
Rutile-type titanium dioxide produced by the sulfuric acid method, alumina-treated titanium dioxide (titanium dioxide 2) having a primary average particle size of 0.22 μm
A rutile type titanium dioxide produced by the chlorine method, treated with alumina having a primary average particle diameter of 0.21 μm and then surface-treated with methylhydrogenpolysiloxane

(5) Component (E): at least one metal salt selected from organic alkali metal salts and organic alkaline earth metal salts (C ₄ F ₉ SO ₃ K)
Perfluorobutanesulfonic acid potassium salt (Dainippon Ink & Chemicals, Inc. “Megafac F114 (registered trademark)”)

(6) Component (F): Fluropolymer (PTFE / AS)
50/50 (weight ratio) powdered mixture of polytetrafluoroethylene (PTFE) and acrylonitrile-styrene copolymer (AS) (“Blendex 449 (registered trademark)” manufactured by GE Specialty Chemicals)

[Examples 1 to 3 and Comparative Examples 1 to 4]
The components (A), (B), (C), (D), (E), and (F) are melt-kneaded using a twin-screw extruder in the amounts shown in Table 1 (units are parts by weight) and aromas. A polycarbonate resin composition was obtained.
Ingredients excluding ingredient (A), ie, ingredients (B), (C), (D), (E), and (F) (these are all powders) are preliminarily mixed for 5 minutes using a tumbler in advance. To obtain a powder raw material mixture. Thereafter, the powder raw material mixture and component (A) (component (A) is in the form of pellets) were further mixed with a tumbler for 5 minutes to prepare a raw material premix consisting of components (A) to (F). .
In Examples 1 and 2 and Comparative Examples 1 and 4, the pH of the mixture of component (B) and component (C) was measured according to JIS K5101 standard and found to be 6.5. .
A twin-screw extruder (ZSK-25, L / D = 37, manufactured by Werner & Pfleiderer) was used as the melt-kneading apparatus.
The raw material premix was charged into a twin screw extruder through a weight feeder, and melt kneaded under the conditions of a cylinder setting temperature of 250 ° C., a screw rotation speed of 200 rpm, and a kneading resin discharge speed of 15 kg / Hr. During melt kneading, the temperature of the molten resin measured by a thermocouple at the extruder die was 260 to 270 ° C. In addition, a vent port was provided in the latter part of the extruder to perform open devolatilization.
The melt-kneaded aromatic polycarbonate resin composition is extruded into a strand shape and pelletized. The obtained pellets were dried at 120 ° C. for 4 hours, and the following tests were performed.

(1) Flame retardancy A strip-shaped molded body (12.7 mm (width) x 127 mm (length) x 0.8 mm (thickness)) for a combustion test is produced by an injection molding machine (Autoshot 100D, manufactured by FANUC). Filled with a resin composition melted from the center of the molded body under conditions of a cylinder set temperature of 300 ° C and a mold set temperature of 80 ° C, and held for 7 days in an environment of a temperature of 23 ° C and a humidity of 50%. A 20 mm vertical combustion test was performed according to the -94 standard.
The degree of flame retardancy represents high flame retardancy in the order of V-0>V-1>V-2> NC (non-classification), but was classified according to the following criteria in the present invention.
○: V-0
Δ: V-1
X: V-2 or NC (NC means unclassifiable)

(2) Flexural modulus Filled with resin composition from one end of the molded product into 1/8 inch thick strips using an injection molding machine (Autoshot 100D, manufactured by FANUC) set at a cylinder temperature of 280 ° C and a mold temperature of 80 ° C. Then, the flexural modulus (unit: MPa) was measured according to ASTM D790. The measurement temperature is 23 ° C.
The higher the flexural modulus is, the more difficult the molded body is to be deformed, but it was classified according to the following criteria.
○: Elastic modulus is 3,000 MPa or more ×: Elastic modulus is less than 3,000 MPa

(3) Melt index (MI value)
In accordance with JIS K7210, the MI value (unit: g / 10 min) was measured at a furnace temperature of 300 ° C. and a load of 1.2 kg.
In Examples and Comparative Examples of the present invention, when the aromatic polycarbonate used (component (A)) is the same and the blending amount of component (B) is also the same, the lower the MI value, the more the resin composition deteriorates. It can be judged that the melt stability is low, and is classified according to the following criteria.
○: MI value is less than 20 g / 10 min. X: MI value is 20 g / 10 min or more.

(4) Light reflectivity By an injection molding machine (auto shot 100D, manufactured by FANUC) set to a cylinder temperature of 300 ° C. and a mold temperature of 80 ° C., the thickness is 50 mm (width) × 90 mm (length), and the thickness is 3 mm. A three-stage plate having a three-stage shape of 2 mm and 1 mm was molded by filling the resin composition from one end (thickness 3 mm portion) of the molded body.
Using a spectrophotometer UV-3150 manufactured by Shimadzu Corporation, the light reflectance at a wavelength of 550 nm was measured for the 2 mm thickness portion of the three-stage plate, and classified according to the following criteria.
○: Light reflectance is 85% or more ×: Light reflectance is less than 85%

(5) Total light transmittance A three-stage plate having the same shape as the three-stage plate used in the light reflectance measurement is used, and COLOR manufactured by Nippon Denshoku Industries Co., Ltd. is applied to the 1 mm thick portion of the three-stage plate. Using an AND COLOR DIFFERENCE METER MODEL 1001DP, the total light transmittance was measured and classified according to the following criteria.
○: Total light transmittance is less than 2% ×: Total light transmittance is 2% or more

(6) Surface appearance 50 mm (width) x 90 mm (length) x 2.5 mm (thickness) flat plate by an injection molding machine (Autoshot 100D, manufactured by FANUC) set at a cylinder temperature of 300 ° C and a mold temperature of 80 ° C Was molded by filling the resin composition from one end of the molded body, and the surface appearance was visually observed and classified as follows.
○: The occurrence of silver is not observed.
X: The occurrence of silver is observed.

(7) Bending strength With an injection molding machine (Autoshot 100D, manufactured by FANUC) set at a cylinder temperature of 320 ° C and a mold temperature of 80 ° C, it has a 2.5 mm x 2.5 mm square cross section and is long A 100 mm square rod shaped molded body was molded by filling the resin composition from one end. An acute notch having a depth of 0.5 mm, a width of 1 mm, and a notch tip shape of 0.25 was placed at a position (center portion) 50 mm from the end of the molded body.
Evaluate the bending strength of the molded body by fixing one end of the molded body with the notch facing downward on a horizontal base, fixing one end of the molded body, and lifting the other end up to a height of 50 mm. The following classification was performed.
○: No damage.
×: Damaged at the notch.
The results of Examples and Comparative Examples are shown in Table 1.
The example product of the present invention is evaluated as “good” in all of the above physical properties, while the comparative product is evaluated as “poor” in at least one physical property.

  The aromatic polycarbonate resin composition of the present invention is excellent in light reflectivity, light concealment, surface appearance, rigidity, bending strength, and melt stability. Since it is excellent, it is suitable for uses such as molded products such as backlight reflectors for liquid crystal displays.

Claims (10)

0.1 to 50 parts by weight of silicate compound (B), aromatic sulfonic acid compound and / or aromatic sulfonic acid compound derivative with respect to 100 parts by weight of aromatic polycarbonate or resin (A) mainly composed of aromatic polycarbonate (C) 0.001 to 5 parts by weight, titanium oxide (D) 1 to 50 parts by weight , alkali metal salt of organic sulfonic acid and / or alkaline earth metal salt of organic sulfonic acid (E) 0.001 to 1 part by weight Part, an aromatic polycarbonate resin composition containing 0.01 to 1 part by weight of the fluoropolymer (F). Weight parts of said aromatic sulfonic acid compound and / or aromatic sulfonic acid compound derivative (C) is, when該珪acid salt compound (B) and the components of a mixture of (C) was measured pH value on the basis of JIS K5101 The aromatic polycarbonate resin composition according to claim 1, wherein the pH value of the mixture is in the range of 4 to 8 parts by weight.   The aromatic polycarbonate resin composition according to claim 1 or 2, wherein the silicate compound (B) is one or more selected from the group consisting of talc, mica, and wollastonite. object.   The aromatic polycarbonate resin composition according to claim 1 or 2, wherein the silicate compound (B) is talc and / or mica. The aromatic polycarbonate resin composition according to any one of claims 1 to 4 , wherein the titanium oxide (D) is titanium oxide surface-treated with alumina and / or silica. The aromatic according to any one of claims 1 to 5 , wherein the titanium oxide (D) is a titanium oxide that has been surface-treated with alumina and / or silica and then surface-treated with an organosiloxane compound. Polycarbonate resin composition. The aromatic polycarbonate resin composition according to any one of claims 1 to 6 , wherein the titanium oxide (D) has a primary average particle size of 0.1 to 0.3 µm. Molded article obtained by molding the aromatic polycarbonate resin composition according to any one of claims 1-7. A molded article for a reflector, formed by molding the aromatic polycarbonate resin composition according to any one of claims 1 to 7 . It is a reflector for backlights, The molded product for reflectors of Claim 9 characterized by the above-mentioned.