JP5078224B2 - Aromatic polycarbonate resin composition and molded article - Google Patents

Description

  The present invention relates to an aromatic polycarbonate resin composition having a white appearance and a molded article excellent in light shielding properties and surface appearance. Furthermore, in addition to these characteristics, the present invention relates to an aromatic polycarbonate resin composition excellent in melt stability, rigidity, and flame retardancy, and a molded article formed by molding the same.

A resin composition obtained by blending titanium polycarbonate with aromatic polycarbonate is a resin material that has excellent light shielding and light reflection properties, as well as excellent shock resistance and heat resistance. It is used for a reflector for a backlight unit for liquid crystal displays and the like.
Recently, due to demands for a wide variety of designs, there is an increasing demand for various aromatic polycarbonate resin molded products having a high light-shielding property while having a white appearance.
For example, in a liquid crystal projector, there is a demand for an injection molding material for a white casing that does not leak light from the periphery of a high-intensity light source unit. Further, there is a demand for a white sheet or film having high light shielding properties while being thin.
In order to improve the light shielding property and light reflectivity of the aromatic polycarbonate resin composition, a method of blending titanium oxide is common, and in recent examples, Patent Documents 1 to 4 and the like can be mentioned.
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. Even in applications where only light hiding is required as a characteristic, in the case of a white appearance, it is necessary to reduce the amount of dye or pigment to increase the light hiding, so a large amount of titanium oxide is used. It was necessary to mix with an aromatic polycarbonate.

In the aromatic polycarbonate, there is a problem that the melt stability at the time of molding is greatly reduced due to the blending of a large amount of titanium oxide. That is, there is a problem that the blending of a large amount of titanium oxide not only lowers the molecular weight of the aromatic polycarbonate, but also generates silver during molding and tends to cause poor appearance. Furthermore, the blend of 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 a thin molded body, the flexibility of the molded body decreases. In addition, there is a problem that the molded body is easily broken in the 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 high 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.

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 an aromatic polycarbonate resin composition having a white appearance excellent in light shielding properties and surface appearance, and a molded article formed by molding the same, and in addition to these characteristics, it is melted. An aromatic polycarbonate resin composition excellent in stability, flame retardancy, and rigidity, and a molded body formed by molding the same.

  As a result of intensive studies on the above problems, the inventors of the present invention blended a combination of a silicate compound and titanium oxide with respect to an aromatic polycarbonate, and further contained a very small amount of a dye / pigment, thereby producing a white-colored pigment. The present inventors have found the surprising fact that although the resin composition is a resin composition, the light shielding property is remarkably improved, and at the same time, a resin composition having an excellent surface appearance can be obtained, and the present invention has been achieved.

That is, the present invention includes the following [1] to [11].
[1] 3 to 10 parts by weight of a silicate compound (B), 5 to 12 parts by weight of titanium oxide (C), organic dye, based on 100 parts by weight of an aromatic polycarbonate or a resin (A) mainly composed of an aromatic polycarbonate Dye or pigment or a combination of organic dye / pigment and carbon black (weight ratio of organic dye / carbon black = 3/25 to 1/2) (excluding fluorescent brightener) (D) 0.0001 An aromatic polycarbonate resin composition having a white appearance containing ˜0.003 parts by weight, wherein the total light transmittance is less than 0.2% when the product thickness is 1 mm. Group polycarbonate resin composition. (However, the amount of the thermoplastic resin other than the aromatic polycarbonate is 1 to 15 parts by weight with respect to 100 parts by weight of the total amount of the component (A).
[2] The aromatic polycarbonate resin composition further comprises 0.001 to 5 parts by weight of a compound (E) selected from an organic acid and / or an organic acid ester, an organic acid anhydride, an organic acid phosphonium salt, and an organic acid ammonium salt. The aromatic polycarbonate resin composition according to the above [1], comprising:
[3] The aromatic polycarbonate resin composition is further selected from at least an alkali metal salt and / or alkaline earth metal salt of an aliphatic sulfonic acid, an alkali metal salt and / or an alkaline earth metal salt of an aromatic sulfonic acid. The aromatic polycarbonate resin composition according to the above [1] or [2], comprising 0.001 to 1 part by weight of one kind of metal salt (F).

[4] The aromatic polycarbonate resin according to any one of [1] to [3], wherein the aromatic polycarbonate resin composition further contains 0.01 to 1 part by weight of a fluoropolymer (G). Composition.
[5] number of parts by weight of the component (E) is該珪acid salt compound the component (B) and a mixture of (E) when measured pH value on the basis of JIS-K-5101, pH value of the mixture Is an aromatic polycarbonate resin composition according to any one of [2] to [4], wherein the aromatic polycarbonate resin composition is in the range of 4 to 8 parts by weight.
[6] The aromatic polycarbonate resin composition according to any one of [1] to [5], wherein the silicate compound (B) is at least one selected from talc and mica. .

[7] The component (E) is an aromatic polycarbonate resin composition according to any one of the which is a compound selected from organic sulfonic acids and / or organic sulfonic acid ester [2] ~ [6] object.
[8] The aromatic polycarbonate resin composition according to any one of [1] to [7], wherein the titanium oxide (C) is titanium oxide treated with alumina and / or silica.
[9] The titanium oxide (C) according to any one of the above [1] to [7], wherein the titanium oxide (C) is titanium oxide treated with an alumina and / or silica and then treated with an organosiloxane compound. Aromatic polycarbonate resin composition.

[10] The aromatic polycarbonate resin composition according to any one of [1] to [9], wherein the titanium oxide (C) has a primary average particle size of 0.1 to 0.3 μm. object.
[ 11 ] A molded product formed by molding the aromatic polycarbonate resin composition according to any one of [1] to [ 10 ].

  The aromatic polycarbonate fat composition of the present invention and a molded product obtained by molding the same are an aromatic polycarbonate resin composition and a molded product excellent in light shielding properties and surface appearance, and in addition to these properties. An aromatic polycarbonate resin composition and a molded article excellent in melt stability, flame retardancy, and rigidity, and extremely useful industrially.

The present invention will be specifically described below.
The aromatic polycarbonate resin composition of the present invention is characterized by having a “white appearance”. The “white appearance” as used in the present invention is L ^* determined by a spectrocolorimetric method (JIS-Z-8722) ^. The value is 70 or more, preferably 80 or more, more preferably 85 or more.
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 Methods of polymerization [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 (corresponding to US Pat. What was manufactured by the method 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 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.

In the resin mainly composed of the aromatic polycarbonate, examples of thermoplastic resins other than the aromatic polycarbonate that can be preferably used include polystyrene, high impact polystyrene (HIPS), and acrylonitrile-styrene resin (AS resin). , 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 thermoplastic resins such as polyester resins such as polybutylene terephthalate, polyamide resins, 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. Form of crystal water in the hydrate is intended to be included as a hydrogen silicate ion as Si-OH, to the metal cation hydroxide ion (OH ^-) Included in ionic as, included as water molecules in the interstices of 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 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.
Preferred in 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.
Further, 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 minor axis direction is (c). 300, more preferably 20-200.

In the present invention, the average particle size of the component (B) is preferably 0.1 to 500 μm, more preferably 0.5 to 100 μm, still more preferably 1 to 50 μm, particularly preferably 2 to 30 μm, most preferably 3 to 20 μm. preferable.
In addition, the average particle diameter as used in the field of this invention calculates | requires an average particle diameter by the laser diffraction method (For example, Shimadzu Corporation make; using SALD-2000).
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 hydrous magnesium silicate having a layered structure, represented by the chemical formula 4SiO ₂ .3MgO.H ₂ O, and 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 (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), 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 0.1-30 weight part with respect to 100 weight part of components (A), 0.5-25 weight part is preferable, and 1-20 weight part is more preferable. 2 to 15 parts by weight is more preferable, and 3 to 10 parts by weight is particularly preferable.
When the amount of the component (B) used exceeds 30 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 light hiding property is reduced. The flame retardancy tends to decrease.

Component (C) used in the present invention is titanium oxide, particularly preferably titanium dioxide. The primary particle size of the component (C) used in the present invention is preferably 0.05 to 0.5 μm, more preferably 0.1 to 0.4 μm, still more preferably 0.1 to 0.3 μm. It is.
As the titanium oxide, those produced by either the sulfuric acid method or the 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 titanium oxide used in the present invention is preferably surface-treated. Examples of the surface treatment agent include hydrated oxides such as alumina and / or silica, amine compounds such as triethanolamine, polyol compounds such as trimethylolethane, and the like. Those treated with a hydrous oxide such as alumina and / or silica are more preferred.
More preferably, in addition to the surface treatment, an organic siloxane compound such as alkylpolysiloxane, alkylarylpolysiloxane, alkylhydrogenpolysiloxane, or a silane coupling agent such as alkyltrimethoxysilane or γ-aminopropyltriethoxysilane. What was processed is preferable and polyorganohydrogensiloxane, such as alkyl hydrogen polysiloxane and alkyl hydrogen polycyclosiloxane, is mentioned as a particularly preferable surface treating agent.

Examples of the surface treatment method relating to component (C) include a wet method and a dry method. The wet method is performed by adding titanium oxide to a liquid mixture of a surface treatment agent and a low boiling point solvent, and removing the solvent after stirring. 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 a dumbler, 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. . The compounding amount of the component (C) in the present invention is 1 to 30 parts by weight, preferably 2 to 30 parts by weight, more preferably 3 to 20 parts by weight, based on 100 parts by weight of the component (A). The amount is preferably 4 to 15 parts by weight, particularly preferably 5 to 12 parts by weight.
When the usage-amount of a component (C) exceeds 30 weight part, it exists in the tendency for the melt stability of a resin composition, impact resistance, 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.

The component (D) 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 an aromatic polycarbonate.
Since the resin composition of the present invention is an aromatic polycarbonate resin composition having a white appearance and high light shielding properties, the amount of component (D) used is extremely small. However, in the present invention, by using a combination of a very small amount of the component (D) in addition to the components (B) and (C), a resin composition with significantly improved light shielding properties can be obtained.
Specific examples of such component (D) include titanium yellow, petal, ultramarine blue, cobalt blue, spinel green and other inorganic pigments, condensed azo organic pigments, quinacrine organic pigments, isoindolinone organic pigments, 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 the present invention, the component (D) can be used in combination of two or more.
The compounding quantity of the component (D) in this invention is 0.0001-0.1 weight part with respect to 100 weight part of component (A). When the amount of the component (D) used is less than 0.0001 parts by weight, the light shielding property tends to be inferior. On the other hand, when it exceeds 0.1 parts by weight, it is difficult for the composition to maintain a white appearance.

Component (E) used in the present invention is an organic acidic compound and / or an organic acidic compound derivative.
Specific examples of the component (E) 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, by using a combination of component (B) and component (E), not only light reflectivity and light hiding properties, but also flame retardancy and melt stability of the resin composition, and further a thin product. In this case, the bending strength can be dramatically improved.
In the present invention, when the component (E) is used, the amount of the component (E) used relative to the component (B) is also extremely important, and even if the amount of the component (E) is too small relative to the component (B) Even so, it is difficult to obtain the excellent effects of the present invention, 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.
The “organic acid derivative” refers to 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 (E) 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 compound, but also an oligomeric or polymeric compound. Things can be used. In the present invention, the component (E) can be used in combination of two or more.
As component (E) 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 preferably used. it can.
Among them, when an organic sulfonic acid or an organic sulfonic acid ester is used as the component (E), 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.

Examples of the organic sulfonic acid that can be preferably used as the component (E) of the present invention include benzenesulfonic acid, p-toluenesulfonic acid, xylenesulfonic acid, naphthalenesulfonic acid, diisopropylnaphthalenesulfonic acid, diisobutylnaphthalenesulfonic acid, dodecyl. 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 (E) of the present invention include methyl benzenesulfonate, ethyl benzenesulfonate, propyl benzenesulfonate, butyl benzenesulfonate, octyl benzenesulfonate, and benzenesulfonic acid. Phenyl, methyl p-toluenesulfonate, ethyl p-toluenesulfonate, propyl p-toluenesulfonate, butyl p-toluenesulfonate, octyl p-toluenesulfonate, phenyl p-toluenesulfonate, methyl naphthalenesulfonate, naphthalene Examples include ethyl sulfonate, propyl naphthalene sulfonate, butyl naphthalene sulfonate, 2-phenyl-2-propyl dodecylbenzene sulfonate, and 2-phenyl-2-butyl dodecyl benzene sulfonate. Can.

Examples of the organic sulfonic acid phosphonium salt that can be used as the component (E) of the present invention include octylsulfonic acid tetrabutylphosphonium salt, decylsulfonic acid tetrabutylphosphonium salt, benzenesulfonic acid tetrabutylphosphonium salt, and dodecylbenzenesulfone. Examples thereof include tetraethylphosphonium acid salt, tetrabutylphosphonium salt of dodecylbenzenesulfonic acid, tetrahexylphosphonium salt of dodecylbenzenesulfonic acid, tetraoctylphosphonium salt of dodecylbenzenesulfonic acid, and the like.
Examples of the organic sulfonic acid ammonium salt that can be used as the component (E) 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, 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 (E) includes —OH 3 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 (E) 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 (E) in this invention, the usage-amount is the range of 0.001-5 weight part with respect to 100 weight part of component (A), More preferably, it is 0.01-3 weight part. Parts, more preferably 0.05 to 2 parts by weight, particularly preferably 0.1 to 1 part by weight. When the amount of component (E) used is less than 0.001 part by weight, the effect of improving the melt stability tends to be insufficient, whereas when it exceeds 5 parts by weight, the melt stability of the resin composition is lowered. Tend to.

The amount (parts by weight) of component (E) used in the composition of the present invention is such that when the pH value of the mixture of component (B) and component (E) 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 usage amount of the component (E) in the present invention varies depending on the type, shape and amount of the component (B) or the type of the component (E).
The amount of component (E) used is such that when the pH value of a mixture of component (B) and component (E) 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 (B) and component (E) in the present invention, when the solubility of component (E) in water is low, alcohols such as ethanol and isopropyl alcohol are dispersed in the suspension. Used as a medium.

Component (F) used in the present invention is at least one organic acid metal salt selected from organic acid alkali metal salts and organic acid alkaline earth metal salts.
In the present invention, excellent flame retardancy can be obtained by using the component (F). The organic acid metal salt that can be preferably used as the component (F) of the present invention is a metal salt of an organic sulfonic acid and / or a metal salt of a sulfate ester, and these are used not only alone but also in combination of two or more. It is also possible to do.
Examples of the alkali metal contained in the component (F) of the present invention include lithium, sodium, potassium, rubidium, and cesium. 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 in the sense of containing either or both of an alkali metal salt and an alkaline earth metal salt.

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 aromatic sulfonamide alkali / alkaline earth metal salts such as saccharin, N- (p-tolylsulfonyl) -p-toluenesulfonimide, Examples include N- (N′-benzylaminocarbonyl) sulfanilimide, and alkali / alkaline earth metal salts of N- (phenylcarboxyl) sulfanilimide.
Among the components (F) listed above, more preferable alkali / alkaline earth metal salts include alkali / alkaline earth metal salts of aromatic sulfonic acids and alkali / alkaline earth metal salts of perfluoroalkanesulfonic acids. Can be mentioned.
When using a component (F) in this invention, the usage-amount is 0.001-1 weight part normally with respect to 100 weight part of components (A), 0.005-0.8 weight part is preferable, 0.01 to 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. preferable.
When the amount of the component (F) used exceeds 1 part by weight, the melt stability of the resin composition is lowered and tends to be colored by melt kneading. On the other hand, when the amount is less than 0.001 part by weight, flame retardancy occurs. Tend to be insufficient.

Component (G) used in the present invention is a fluoropolymer, and is used for the purpose of preventing dripping of combustion products. The component (G) 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 (G), 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, as the component (G), a fluoropolymer in a powdery mixture with a second resin such as AS or PMMA can also be suitably used. 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 amount of component (G) in the present invention is usually 0.01 to 1 part by weight, preferably 0.05 to 0.8 part by weight, more preferably 100 parts by weight of component (A). 0.1 to 0.6 parts by weight, more preferably 0.2 to 0.4 parts by weight.

In the aromatic polycarbonate resin composition of the present invention, if necessary, a thermal stabilizer, an antioxidant, an ultraviolet absorber (light resistance agent), a lubricant, a release agent, an antistatic agent, a fluorescent brightening agent, and the like are further added. It can also be added. Moreover, various flame retardants, such as a phosphorus flame retardant, a bromine flame retardant, and a silicone flame retardant, can also be included.
The heat stabilizer preferably contains a phosphorus heat stabilizer. By blending such a phosphorus-based stabilizer, 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 the phosphorous heat stabilizer, phosphoric acid ester, phosphorous acid ester, phosphonic acid 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 monophenyl phosphite. Phyto, 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) pentaerythritol 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'- Biphenylene diphosphonite, tetrakis (2,4-di-tert-butylphenyl) -3,3'-biphenylene diphosphonite, tetrakis (2,6-di-iso-propylphenyl) -4,4'-biphenylenedi Phosphonite, tetrakis (2,6-di-n-butylphenyl) -4,4′-biphenylenediphosphonite, tetrakis ( , 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, benzenephosphonic acid Dipropyl can be exemplified.

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.
When using a phosphorus stabilizer, the amount used is preferably 0.001 to 1 part by weight, more preferably 0.01 to 0.5 part by weight, with respect to 100 parts by weight of the component (A), and 0.02 -0.3 weight part is further more preferable. Moreover, you may use a phosphorus stabilizer 1 type or in mixture of 2 or more types.
Examples of the ultraviolet absorber 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 Enol, 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.

When using these ultraviolet absorbers, the usage-amount is 0.01-1 weight part normally with respect to 100 weight part of component (A), Preferably 0.05-0.8 weight part can be mix | blended.
As the mold release agent, a fatty acid ester compound can be preferably used. The fatty acid ester is preferably a partial ester or a total ester of a monovalent or polyhydric alcohol having 1 to 20 carbon atoms and a saturated fatty acid having 10 to 30 carbon atoms. Specific examples thereof include stearic acid monoglyceride, stearin Acid diglyceride, stearic acid triglyceride, stearic acid monosorbate, behenic acid monoglyceride, pentaerythritol monostearate, pentaerythritol tetrastearate, pentaerythritol tetrapelargonate, propylene glycol monostearate, stearyl stearate, palmityl palmitate, Examples include butyl stearate, methyl laurate, isopropyl palmitate, biphenyl biphenate, sorbitan monostearate, 2-ethylhexyl stearate, etc. Rukoto can, monoglyceride stearate, triglyceride stearate, pentaerythritol tetrastearate are particularly preferred. These may be used alone or in combination of two or more.

When using these fatty acid ester, the usage-amount is 0.01-0.5 weight part normally per 100 weight part of a component (A), Preferably 0.1-0.3 weight part can be mix | blended. .
Examples of the fluorescent brightener include stilbenzene, benzimidazole, benzoxazole, naphthalimide, rhodamine, coumarin, and oxazine compounds. When these fluorescent brighteners are used, the amount used is usually 0.001 to 0.1 parts by weight, preferably 0.001 to 0.05 parts by weight per 100 parts by weight of component (A). 0.001 to 0.02 part by weight can be preferably blended.

Next, the manufacturing method of the aromatic polycarbonate resin composition of this invention is demonstrated.
The resin composition of the present invention contains the above components (A) to (D), and components (E) to (G) and other components, if necessary, at a composition ratio described in the present specification, an extruder and the like. It can obtain by melt-kneading using the melt-kneading apparatus. 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 organic acidic compound derivative (E). It is more preferable to supply the melt-kneading apparatus after chemical or physical surface treatment via interstitial force or hydrogen bond.

  As a method for subjecting the component (B) to the surface treatment with the component (E) in advance, for example, the following method can be used. A predetermined amount of the component (E) is blended with the component (B). If necessary, the component (E) is formed into a molten state, a solution state, or a gas state by a method such as spraying, dripping, wetting, or dipping. The mixture is brought into contact with (B) and mixed and stirred using a mechanical mixing device such as a Henschel mixer, Nauta 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 (E), but it is more effective to perform heating and heating to a temperature equal to or higher than the melting point of the component (E). 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 (E) 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 article 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, vacuum molding, etc. Molding and extrusion are 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 reflector materials, lighting component materials, flame retardant sheets (insulating sheets) for electronic and information equipment, light shielding sheets, light shielding films, etc. It can be suitably used when the property is required.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples and the like.
In Examples or Comparative Examples, the following components (A), (B), (C), (D), (E), (F), (G) are used to produce an aromatic polycarbonate resin composition. did.

1. Component (A): Aromatic polycarbonate (A-1)
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 ) 300 ppm of propionate and 300 ppm of tris (2,4-di-t-butylphenyl) phosphite as a phosphite heat stabilizer.
Weight average molecular weight (Mw) = 22,000
2. Component (B): Silicate compound (B-1)
“Micro Ace P3 (registered trademark)” manufactured by Nippon Talc Co., Ltd.

3. Component (C): Titanium oxide (C-1)
Rutile-type titanium dioxide produced by the sulfuric acid method, alumina-treated titanium dioxide (C-2) having a primary average particle size of 0.22 μm
3. Rutile-type titanium dioxide produced by a chlorine method, which is treated with alumina having a primary average particle size of 0.21 μm and then surface-treated with methyl hydrogen polysiloxane. Component (D): Dyeing pigment (D-1)
“Mitsubishi Carbon No. 50 (registered trademark)” manufactured by Mitsubishi Chemical Corporation
(D-2)
“Dia Resin Yellow H2G (registered trademark)” manufactured by Mitsubishi Chemical Corporation

5. Component (E): Organic acidic compound and / or organic acidic compound derivative (E-1)
p-Toluenesulfonic acid, manufactured by Wako Pure Chemical Industries, Ltd. Component (F): At least one metal salt (F-1) selected from organic alkali metal salts and organic alkaline earth metal salts
Perfluorobutanesulfonic acid potassium salt (manufactured by Dainippon Ink Industries, Ltd., “Megafac F114 (registered trademark)”)
7). Component (G): Fluropolymer (G-1)
50/50 (weight ratio) powdery mixture of polytetrafluoroethylene (PTFE) and polymethyl methacrylate (PMMA) (Mitsubrene A3800 (registered trademark), manufactured by Mitsubishi Rayon Co., Ltd.)

(Examples 1-2, Reference Examples 3-5, and Comparative Examples 1-4)
Components (A), (B), (C), (D), (E), (F), (G) components shown in Table 1 in amounts (
An aromatic polycarbonate resin composition was obtained by melt kneading using a twin screw extruder in units of parts by weight.
Components other than component (A), that is, components (B), (C), (D), (E), (F), and (G) (these are all powders) are previously used with a tumbler. Premixing was performed for 5 minutes 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 for 5 minutes with a tumbler to prepare a raw material premix consisting of components (A) to (G). .
In Examples 1, 2, Reference Example 4, Reference Example 5, and Comparative Example 1, pH measurement was performed on the mixture of component (B) and component (E) in accordance with JIS-K-5101 standard. As a result, it was 6.0.

The melt kneading apparatus used was a twin screw extruder (ZSK-25, L / D = 37, manufactured by Werner & Pfleiderer).
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 5 hours, and the following tests were performed.

(1) Total light transmittance The cylinder temperature is set to 300 ° C., the mold temperature is set to 80 ° C., and using an injection molding machine (Autoshot 100D, manufactured by FANUC), it is 50 mm (width) × 90 mm (length). A three-stage plate having a thickness of 3 mm, 2 mm, and 1 mm was prepared. The gate position of the molded body is one end (thickness 3 mm portion) of the molded body, which is a tab-shaped gate.
Using a COLOR AND COLOR DIFFERENCE METER MODEL 1001DP manufactured by Nippon Denshoku Industries Co., Ltd., the total light transmittance was measured with respect to the 1 mm thick portion of the three-stage plate, and classified according to the following criteria.
○: Total light transmittance is less than 0.2% ×: Total light transmittance is 0.2% or more In addition, with the multimedia projector “ELP-51” manufactured by Epson Corporation, the light source is turned on. The 1 mm thick portion of the three-stage plate was pressed against the projection lens portion, and the light shielding property was visually judged in the dark room.
◯: There is no light transmission and the light shielding property is good.
X: Light transmission is recognized.

(2) Surface appearance 50 mm (width) x 90 mm (length) x 2.5 mm (thickness) flat plate with an injection molding machine (Autoshot 100D, manufactured by FANUC) set to 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.
(3) Flexural modulus Filled with resin composition from one end of the molded product to 1/8 inch thick strips 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. Then, the flexural modulus (unit: MPa) was measured according to ASTM D790. The measurement temperature is 23 ° C.
(4) Flame retardancy A strip-shaped molded product (12.7 mm (width) x 127 mm (length) x 1.5 mm (thickness)) for a combustion test was produced by an injection molding machine (Autoshot 100D, manufactured by FANUC). Molding was performed 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%, and then a 20 mm vertical combustion test was performed according to UL-94 standards.
The degree of flame retardancy represents high flame retardancy in the order of V-0>V-1> V-2.
(5) L ^* value Using the spectrocolorimeter CM-2002 made by Minolta Co., Ltd., the L ^* value was measured using the 2 mm thick part of the three-stage plate used in the previous light transmittance measurement. The measurement conditions were D65 / 10 °.
The results are shown in Table 1.

  The aromatic polycarbonate resin composition of the present invention and a molded article formed by molding the same are an aromatic polycarbonate resin composition and a molded article excellent in light shielding properties and surface appearance, and further, melt stability, difficulty. An aromatic polycarbonate resin composition and molded product with excellent flammability and rigidity. Computers, notebook computers, copiers, printers, liquid crystal projectors, electric / electronic devices, mobile phones, personal digital assistants, battery packs, home appliances It can be applied to housing materials such as backlight units, reflectors for backlight units, lighting component materials, flame retardant sheets (insulating sheets) for electronic and information equipment, light shielding sheets, light shielding films, etc. Useful.

Claims (11)

3 to 10 parts by weight of a silicate compound (B), 5 to 12 parts by weight of titanium oxide (C), an organic dye or pigment, or 100 parts by weight of an aromatic polycarbonate or a resin (A) mainly composed of an aromatic polycarbonate, or Dye / pigment consisting of a combination of organic dye / pigment and carbon black (weight ratio of organic dye / carbon black = 3/25 to 1/2) (excluding fluorescent brightener) (D) 0.0001-0. An aromatic polycarbonate resin composition having a white appearance containing 003 parts by weight, wherein the total light transmittance is less than 0.2% when the product thickness is 1 mm Composition.
(However, the amount of the thermoplastic resin other than the aromatic polycarbonate is 1 to 15 parts by weight with respect to 100 parts by weight of the total amount of the component (A).   The aromatic polycarbonate resin composition further comprises 0.001 to 5 parts by weight of a compound (E) selected from organic acids and / or organic acid esters, organic acid anhydrides, organic acid phosphonium salts, and organic acid ammonium salts. The aromatic polycarbonate resin composition according to claim 1.   The aromatic polycarbonate resin composition further comprises at least one selected from an alkali metal salt and / or alkaline earth metal salt of an aliphatic sulfonic acid, an alkali metal salt and / or an alkaline earth metal salt of an aromatic sulfonic acid. The aromatic polycarbonate resin composition according to claim 1, comprising 0.001 to 1 part by weight of a metal salt (F).   The aromatic polycarbonate resin composition according to any one of claims 1 to 3, wherein the aromatic polycarbonate resin composition further contains 0.01 to 1 part by weight of a fluoropolymer (G).   When the pH value of the component (E) is 4 to 4 when the pH value of the mixture of the silicate compound (B) and the component (E) is measured based on JIS-K-5101. The aromatic polycarbonate resin composition according to any one of claims 2 to 4, wherein the aromatic polycarbonate resin composition is in the range of 8 parts by weight.   6. The aromatic polycarbonate resin composition according to claim 1, wherein the silicate compound (B) is at least one selected from talc and mica.   The aromatic polycarbonate resin composition according to any one of claims 2 to 6, wherein the component (E) is a compound selected from organic sulfonic acid and / or organic sulfonic acid ester.   The aromatic polycarbonate resin composition according to claim 1, wherein the titanium oxide (C) is titanium oxide treated with alumina and / or silica.   The aromatic polycarbonate resin composition according to any one of claims 1 to 7, wherein the titanium oxide (C) is a titanium oxide treated with an organosiloxane compound after being treated with alumina and / or silica. .   The aromatic polycarbonate resin composition according to any one of claims 1 to 9, wherein the titanium oxide (C) has a primary average particle size of 0.1 to 0.3 µm.   The molded article formed by shape | molding the aromatic polycarbonate resin composition in any one of Claims 1-10.