JP2001302899A - Aromatic polycarbonate resin composition and its molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an aromatic polycarbonate resin composition having high light reflection characteristic and excellent mechanical characteristics and suitable for uses for reflecting plates. SOLUTION: This aromatic polycarbonate resin composition is obtained by compounding (C) 0.5-20 pts.wt. of a rubber-like polymer with 100 pts.wt. of a resin composition composed of (A) 95-60 wt.% of an aromatic polycarbonate resin and (B) 5-40 wt.% of titanium oxide. The rubber-like polymer (C) is one or more kinds selected from the group consisting of (C-1) a specific acrylic rubber-based graft copolymer, (C-2) a specific acrylic rubber-based graft copolymer composition and (C-3) a specific olefinic copolymer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an aromatic polycarbonate resin composition, and more particularly, to an aromatic polycarbonate resin composition having high light reflection characteristics and excellent mechanical characteristics, and a molded product thereof.

[0002]

2. Description of the Related Art As a reflector such as a liquid crystal display panel or an LED display panel, a resin molded product which has been subjected to plating and painting has been used. However, it takes time and expense to apply plating and painting to the resin molded product. For this reason, there is a demand for the development of a reflector plate material which has high reflectivity and does not require plating or painting. Aromatic polycarbonate resins are excellent in mechanical properties, dimensional stability, heat resistance, and the like, and thus are suitable for use in reflectors such as liquid crystal display panels and LED display panels. As a method of increasing the reflectance by imparting a reflective performance to such an aromatic polycarbonate resin, a method of improving the whiteness by blending titanium oxide with the aromatic polycarbonate resin and imparting a light shielding property has been studied. I have. However, when the compounding amount of the titanium oxide increases, the molecular weight of the aromatic polycarbonate resin decreases under the heating and melting conditions due to the chemically active sites present on the surface of the titanium oxide, and the mechanical properties deteriorate and the coloring occurs at the same time. Therefore, a reflector having sufficient performance cannot be obtained. In addition, as the weight and weight of the final product have been reduced, a reflector made of an aromatic polycarbonate resin has also been required to have a thinner wall and have flame retardancy.

[0003] As a method for solving the above-mentioned problem caused by the chemically active sites on the surface of titanium oxide, a method of adding a polyorganohydrogensiloxane when compounding titanium oxide with a polycarbonate resin (Japanese Patent Publication No. 63-26140) is known. A method of adding a titanium oxide surface-treated with a hydrated oxide and a polyorganosiloxane or an alkanolamine to a polycarbonate resin (Japanese Patent Publication No. 60-3 Sho 60-3).
No. 430) and a method of adding titanium oxide surface-treated with a specific polyorganosiloxane to a polycarbonate resin (Japanese Patent Application Laid-Open No. 4-202476).

[0004]

However, none of the methods can sufficiently suppress the decrease in the molecular weight of the aromatic polycarbonate resin, and can improve the mechanical properties, particularly the impact strength, of the obtained polycarbonate resin composition. Did not. Further, not only the mechanical properties but also the performance as a reflector was insufficient.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an aromatic polycarbonate resin composition having high light reflection characteristics and excellent mechanical characteristics and suitable for use as a reflector.

[0006]

Means for Solving the Problems The present inventors have found that the above object can be achieved by blending a specific rubbery polymer with a resin composition comprising an aromatic polycarbonate resin and titanium oxide, The present invention has been completed. The aromatic polycarbonate resin composition of the present invention comprises (C) based on 100 parts by weight of a resin composition comprising (A) 95 to 60% by weight of an aromatic polycarbonate resin and (B) 5 to 40% by weight of titanium oxide. (C) a rubbery polymer in an amount of from 0.5 to 20 parts by weight;
-1) at least one member selected from the group consisting of an acrylic rubber-based graft copolymer, (C-2) an acrylic rubber-based graft copolymer composition, and (C-3) an olefin-based copolymer. I do.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The aromatic polycarbonate resin (A) used in the present invention is a general aromatic polycarbonate resin derived from dihydric phenol. (A) The aromatic polycarbonate resin preferably has a viscosity average molecular weight of 10,000 to 60,000, more preferably 15,000 to 30,000. The aromatic polycarbonate resin is usually obtained by reacting a dihydric phenol with a carbonate precursor by a solution method or a melting method. 2 used here
As the dihydric phenol, 2,2-bis (4-hydroxyphenyl) propane (bisphenol A) is preferable, but a part or all of the dihydric phenol may be replaced with another dihydric phenol. Other dihydric phenols include, for example, bis (4-hydroxyphenyl) methane, 2,2-bis (4
-Hydroxy-3,5-dimethylphenyl) propane,
Examples thereof include 2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane and bis (4-hydroxyphenyl) sulfone.

Examples of the carbonate precursor include carbonyl hydride, carbonyl ester, and haloformate. Specific examples include phosgene, diphenyl carbonate, dihaloformate of dihydric phenol, and a mixture thereof. For example, when phosgene is used as a carbonate precursor, the reaction is usually performed in the presence of an acid binder and a solvent. As the acid binder, for example,
An alkali metal hydroxide such as sodium hydroxide and potassium hydroxide or an amine compound such as pyridine is used.
As the solvent, for example, a halogenated hydrocarbon such as methylene chloride benzene is used. For promoting the reaction, a catalyst such as a tertiary amine or a quaternary ammonium salt can be used. In this case, the reaction temperature is usually 0 to 40 ° C., and the reaction time is several minutes to 5 hours.

When an aromatic polycarbonate resin is produced by a transesterification reaction using a carbonate diester such as diphenyl carbonate as a carbonate precursor,
Under an inert gas atmosphere, a predetermined ratio of an aromatic dihydroxy component and a carbonic acid diester are stirred while heating to distill off the alcohol or phenol to be produced. The reaction temperature in this case varies depending on the boiling point of the alcohol or phenol to be formed, but is usually in the range of 120 to 300 ° C. Further, the pressure of the reaction system is reduced from the initial stage of the reaction, and the reaction is completed while distilling off the generated alcohols. Further, a catalyst usually used in a transesterification reaction to promote the reaction may be used. Examples of the carbonic acid diester include diphenyl carbonate, dinaphthyl carbonate, bis (diphenyl) carbonate,
Examples thereof include dimethyl carbonate, diethyl carbonate, and dibutyl carbonate, with diphenyl carbonate being particularly preferred. In the case of producing the (A) aromatic polycarbonate resin, a suitable molecular weight modifier or the like may be appropriately used. The aromatic polycarbonate resins thus obtained are used alone or in combination of two or more.

The titanium oxide (B) used in the present invention is not particularly limited, and any one having an arbitrary particle diameter obtained by various production methods can be used, but titanium oxide produced by a chlorine method can be used. It is more preferable that the crystal structure is a rutile type. For example, titanium oxide used for pigments usually has a particle size of 0.1 to 0.4 μm.
m, but a particle having a particle diameter of less than 0.1 μm may be used here. As the titanium oxide (B), a titanium oxide that has been surface-treated with an inorganic surface treating agent such as alumina or silica can be used, and titanium oxide further treated with an organic surface treating agent is particularly preferable.

Examples of the organic surface treating agent include siloxanes such as alkyl polysiloxane, alkyl aryl polysiloxane and alkyl hydrogen polysiloxane, and organosilicon such as alkyl alkoxy silane and amino silane coupling agent. Specific examples of particularly preferred treating agents among these include methyl hydrogen polysiloxane, methyl trimethoxy silane, trimethyl methoxy silane, N-β (aminoethyl) -γ-aminopropyl trimethoxy silane, N-β
(Aminoethyl) -γ-aminopropylmethyldimethoxysilane and the like. In addition, these surface treatment agents contain stabilizers and dispersants in an amount that does not affect the light reflection properties and mechanical properties of the finally obtained aromatic polycarbonate resin composition. Is also good. Examples of the surface treatment method include a method in which titanium oxide and the above-mentioned surface treatment agent are dispersed in water or an organic solvent to perform wet treatment, and a method in which dry treatment is performed using a super mixer, a Henschel mixer, or the like. In addition, the surface treatment
When the aromatic polycarbonate resin composition of the present invention is produced by blending (A) an aromatic polycarbonate resin, (B) titanium oxide, and (C) a rubbery polymer, a surface treatment agent is blended together with these. Then, it may be performed by a method of mixing with a V-type blender or a method of simultaneously charging the mixture into an extruder.

The mixing ratio of (A) the aromatic polycarbonate resin and (B) titanium oxide is such that the sum of them is 10%.
When it is 0% by weight, usually, (A) aromatic polycarbonate resin is 95 to 60% by weight, and (B) titanium oxide is 5 to 5% by weight.
40% by weight, preferably 95-70% by weight of (A) aromatic polycarbonate resin and 5-30% by weight of (B) titanium oxide. When the proportion of (B) titanium oxide is less than 5% by weight, the amount of transmitted light increases, and a sufficient reflectance is obtained when a finally obtained aromatic polycarbonate resin composition is molded to produce a reflector. Absent. Meanwhile, 4
When the content exceeds 0% by weight, the molecular weight of the aromatic polycarbonate resin (A) decreases, for example, when a resin composition containing the (A) aromatic polycarbonate resin and (B) titanium oxide is mixed under heat and melting conditions. As a result, mechanical properties such as impact strength of the aromatic polycarbonate resin composition are also reduced.

(C) The acrylic rubber-based graft copolymer (C-1) used for the rubbery polymer is obtained by adding a vinyl-based monomer (C1-a) to a polyalkyl (meth) acrylate-based composite rubber (C1-a). C1-b) is obtained by graft polymerization. The polyalkyl (meth) acrylate-based composite rubber (C1-a) used herein contains two or more types of acrylic rubber components having different glass transition temperatures, and each acrylic rubber component has two or more unsaturated rubbers in the molecule. A monomer having a bond is contained in a range of 20% by weight or less. When the polyalkyl (meth) acrylate-based composite rubber (C1-a) has such a glass transition temperature, a molded article of the aromatic polycarbonate resin composition finally obtained is excellent in impact strength. Here, the glass transition temperature of the polymer is measured as a transition point of Tan δ measured by a dynamic mechanical property analyzer (hereinafter, DMA). Generally, a polymer obtained from a monomer has a unique glass transition temperature, and a single transition point is observed for a single component (a random copolymer of a single component or a plurality of components), but a mixture of a plurality of components, Alternatively, a unique transition point is observed in each of the composited polymers. For example, in the case of two components, two transition points are observed by measurement.
In the Tan δ curve measured by DMA, two peaks are observed, but when there is a bias in the composition ratio or when the transition temperature is close, each peak may approach,
Although it may be observed as a peak having a shoulder portion, it can be distinguished from a simple one-peak curve seen in the case of a single component.

The number distribution of the particle diameter of the polyalkyl (meth) acrylate composite rubber (C1-a) is 0.0
Particles having a bidisperse distribution having at least two peaks in the range of 5 μm to 0.4 μm, and 70% by weight or more of the polyalkyl (meth) acrylate-based composite rubber (C1-1a) having a particle size of 0.05 to 0.4 μm. It is a particle having a diameter.
Here, the number distribution is a distribution indicating, as a percentage, the number ratio of all particles within a minute interval between a certain particle diameter d _p and d _p + Δd _p . Here, the polyalkyl (meth) acrylate-based composite rubber (C1-a)
50-99.9% by weight of particles having a particle diameter of 0.05-0.4 μm and 0.1 of particles having a particle diameter of 0.4-1.0 μm
Preferably, it consists of 〜50% by weight. Further, the average particle diameter of the polyalkyl (meth) acrylate-based composite rubber (C1-a) is preferably 0.8 μm or less. Polyalkyl (meth) acrylate-based composite rubber (C1-a)
Is preferably composed of particles having such a particle diameter, because the finally obtained molded article of the aromatic polycarbonate resin composition has excellent mechanical properties such as impact strength. When the average particle size of the polyalkyl (meth) acrylate-based composite rubber (C1-a) exceeds 0.8 μm,
The surface appearance of a molded article of the finally obtained aromatic polycarbonate resin composition may be deteriorated.

The method for producing the polyalkyl (meth) acrylate-based composite rubber (C1-a) used here is described in Japanese Patent Application No. 11-13331 filed by the present inventors.
No. 5 discloses the method disclosed. For example, when the polyalkyl (meth) acrylate-based composite rubber (C1-a) is produced from two types of acrylic rubber components, first, a monomer containing one or more types of alkyl (meth) acrylate is polymerized. A first acrylic rubber component latex is obtained, and then the monomer constituting the second acrylic rubber component is added to the acrylic rubber component latex, impregnated, and then polymerized in the presence of a radical polymerization initiator. Method and the like. As the polymerization proceeds, a latex of a polyalkyl (meth) acrylate-based composite rubber (C1-a) in which two kinds of acrylic rubber components are composited is obtained. Other, second
Can be produced by drop polymerization of the above rubber in the presence of the first rubber, or a method of enlarging the composite rubber with an acid or a salt.

Here, the first acrylic rubber component is preferably at least one of 2-ethylhexyl acrylate, ethoxyethoxyethyl acrylate, methoxytripropylene glycol acrylate, 4-hydroxybutyl acrylate, lauryl methacrylate, and stearyl methacrylate. It is preferable that the second rubber component is an acrylic rubber (Ca2) component containing n-butyl acrylate as a component. More preferably, as the acrylic rubber (Ca1) component, one containing at least one of 2-ethylhexyl acrylate, lauryl methacrylate, and stearyl methacrylate as a component is preferable. Further, in this case, the glass transition temperature (Tg1) derived from the acrylic rubber (Ca1) component of the polyalkyl (meth) acrylate-based composite rubber (C1-a) is higher than the acrylic rubber (Ca1).
When the glass transition temperature (Tg2) derived from the component 2) is lower, the impact strength, particularly the impact strength at a low temperature, is excellent, and the mechanical properties of the aromatic polycarbonate resin composition finally obtained are preferable.

Such polyalkyl (meth) acrylate-based composite rubbers (C1-a) further include 2-ethylhexyl acrylate, ethoxyethoxyethyl acrylate, methoxytripropylene glycol acrylate, 4-hydroxybutyl acrylate, lauryl methacrylate, and stearyl. Acrylic rubber (Ca1) containing at least one of methacrylate as a constituent component
More preferably, it is obtained by emulsion polymerization of a monomer containing n-butyl acrylate constituting the acrylic rubber (Ca2) component in the presence of the component. Here, the polymerization method is not particularly limited, but may be usually emulsion polymerization, and if necessary, forced emulsion polymerization. For the polymerization of the acrylic rubber (Ca1) component preferably used in the present invention, forced emulsion polymerization is preferably used. Can be Further, 2-ethyl acrylate, lauryl methacrylate, and stearyl methacrylate are poorly water-soluble as monomers constituting the acrylic rubber (Ca1) component. Therefore, it is preferable to produce the acrylic rubber (Ca1) component by forced emulsion polymerization. .
Here, a known arbitrary surfactant such as anionic, nonionic or cationic can be used as the emulsifier and the dispersion stabilizer. The mixture can be used if necessary, but it is preferable to use an emulsifier having a large micelle-forming ability and a small emulsifier in combination. The alkyl (meth) acrylate constituting each acrylic rubber component is not particularly limited. In addition to the above-mentioned monomers, methyl acrylate, ethyl acrylate, n-
Propyl acrylate or the like may be used. These alkyl (meth) acrylates are used alone or in combination of two or more.

Among the monomers constituting each acrylic rubber component, a monomer having two or more unsaturated bonds in the molecule is used.
It may be contained in a range of 0% by weight or less. The monomer having two or more unsaturated bonds in the molecule has a role as a cross-linking agent or a graft cross-linking agent. Examples of the cross-linking agent include ethylene glycol dimethacrylate,
Silicones such as propylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate, 1,4-butylene glycol dimethacrylate, divinylbenzene, and polyfunctional methacrylic group-modified silicones. Further, examples of the graft crosslinking agent include allyl methacrylate, triallyl cyanurate, triallyl isocyanurate and the like. Allyl methacrylate can also be used as a crosslinking agent. These cross-linking agents and graft crossing agents are used alone or in combination of two or more. Further, the monomers include styrene, α-methylstyrene, aromatic alkenyl compounds such as vinyl toluene, vinyl cyanide compounds such as acrylonitrile and methacrylonitrile, methacrylic acid-modified silicone, and various vinyl compounds such as fluorine-containing vinyl compounds. The system monomer may be contained as a copolymer component in a range of 30% by weight or less.

Examples of the vinyl monomer (C1-b) to be graft-polymerized on the polyalkyl (meth) acrylate composite rubber (C1-a) include aromatic alkenyl compounds such as styrene, α-methylstyrene, and vinyltoluene; Methacrylic esters such as methyl methacrylate and 2-ethylhexyl methacrylate; acrylic esters such as methyl acrylate, ethyl acrylate and n-butyl acrylate; and various vinyl monomers such as vinyl cyanide compounds such as acrylonitrile and methacrylonitrile. These may be exemplified, and these may be used alone or in combination of two or more. In addition, the vinyl monomer (C1-b) may have ethylene glycol dimethacrylate, propylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate having two or more unsaturated bonds in the molecule, if necessary. 20% by weight or less of a crosslinking agent such as silicone such as 1,4-butylene glycol dimethacrylate, divinylbenzene, and polyfunctional methacryl group-modified silicone, and a graft crossing agent such as allyl methacrylate, triallyl cyanurate and triallyl isocyanurate. You may use it adding in a range.

Acrylic rubber-based graft copolymer (C-
In 1), the ratio of the polyalkyl (meth) acrylate rubber (C1-a) to the vinyl monomer (C1-b) is such that the polyalkyl (meth) acrylate rubber (C
1-a) is 80 to 99.9% by weight, and the vinyl monomer (C
1-b) is 20 to 0.1% by weight, preferably a polyalkyl (meth) acrylate-based composite rubber (C1-a)
Is 85 to 95% by weight, and the vinyl monomer (C1-b) is 1
5 to 5% by weight. When the amount of the vinyl monomer (C1-b) is less than 0.1% by weight, the dispersibility of the obtained acrylic rubber-based graft copolymer (C-1) in the resin composition is reduced, and the final obtained is Processability of the resulting aromatic polycarbonate resin composition may be reduced. On the other hand, if it exceeds 20% by weight, the impact strength of the finally obtained aromatic polycarbonate resin composition may be reduced.

Acrylic rubber-based graft copolymer (C-
1) is obtained by adding a vinyl-based monomer (C1-b) to a latex of a polyalkyl (meth) acrylate-based composite rubber (A) and polymerizing it in one or more stages by radical polymerization. Acrylic rubber-based graft copolymer (C-
1) This graft copolymer latex is put into hot water in which an acid such as sulfuric acid or hydrochloric acid, or a metal salt such as calcium chloride, calcium acetate or magnesium sulfate is dissolved, salted out, coagulated, separated and recovered. To obtain particles. At this time, salts such as sodium carbonate and sodium sulfate may be used in combination. Further, it can be obtained by a direct drying method such as a spray drying method.

(C) The graft copolymer composition (C-2) used for the rubbery polymer comprises an acrylic rubber-based graft copolymer (C2-a), sulfonic acid, a sulfonate, sulfuric acid, An acrylic rubber-based graft copolymer composition containing at least one component selected from the group consisting of sulfates (C2-b). Here, the acrylic rubber-based graft copolymer (C2-a) is a graft copolymer obtained by graft-polymerizing a vinyl-based monomer (C1-b) on a polyalkyl (meth) acrylate-based composite rubber (C1-a). It is united. The polyalkyl (meth) acrylate-based composite rubber (C1-a) has two different glass transition temperatures.
More than one type of acrylic rubber component is contained, and each of the above-mentioned acrylic rubber components contains a monomer having two or more unsaturated bonds in a molecule in an amount of 20% by weight or less. This graft copolymer composition (C-2) can be produced, for example, by the method disclosed in Japanese Patent Application No. 11-133315 previously filed by the present inventors. That is, an acrylic rubber-based graft copolymer (C2-a) is manufactured in the same manner as the above-described method for manufacturing an acrylic rubber-based graft copolymer (C-1), and thereafter, sulfonic acid and a sulfonate are prepared. , Sulfuric acid, and sulfate (S2-b). As another method, there is a method used when the acrylic rubber-based graft copolymer (C2-a) is produced using the component (C2-b) as an emulsifier. Specifically, the method of using as an emulsifier at the time of polymerization when obtaining the first acrylic rubber component latex, in the presence of the first acrylic rubber component,
The method of using as an emulsifier when polymerizing the monomer constituting the second acrylic rubber component, or the obtained polyalkyl (meth) acrylate-based composite rubber (C1-
When a vinyl monomer (C1-b) is graft-polymerized to a), a method used as an emulsifier can be mentioned.

The component (C2-b) is preferably
It contains sulfonic acid or a sulfonate as a main component. Further, as the sulfonic acid or sulfonate, one having at least one phenyl group in one molecule is preferable, and one having two or more phenyl groups in one molecule is more preferable. Two phenyl groups in one molecule
It is preferable to use a sulfonic acid having one or a salt obtained by neutralizing the sulfonic acid, because heat stability at the time of molding an aromatic polycarbonate resin composition finally obtained is improved. Here, at least one phenyl group is contained in one molecule.
The sulfonic acid or sulfonic acid salt having two or more sulfonic acids may be an alkylphenyl type, an alkylphenyl ether type, or the like, and may contain a nonionic polyoxyethylene chain in the molecule. In addition, the above compounds may be used alone or in combination of two or more to form component (C2-
It can be used as b). Specific examples of such compounds include dodecylbenzene sulfonates such as sodium dodecylbenzenesulfonate, polyoxyethylene alkyl ether sulfates such as sodium polyoxyethylene alkyl ether sulfate, and alkyl diphenyl ethers such as sodium alkyl diphenyl ether disulfonate. Although a disulfonate is mentioned, an alkyl diphenyl ether disulfonate such as sodium alkyl diphenyl ether disulfonate is particularly preferably used.

The component (C2-b) is preferably contained in the aromatic polycarbonate resin composition finally obtained in an amount of 0.1 to 2%.
It is preferable to be blended so as to be present in the range of 1 to 100000 ppm. Less than 0.1 ppm or 1000
If it exceeds 00 ppm, the impact strength of the aromatic polycarbonate resin composition may be insufficient. When the component (C2-b) used herein has an emulsifying ability, it is preferable to use this as an emulsifier as described above. When used as an emulsifier, the component (C2-b) is contained in the aromatic polycarbonate resin composition in an amount of 0.1%.
When the acrylic rubber component or the acrylic rubber-based graft copolymer (C2-a), which is a polymerization product, is collected so as to be 1 to 100000 ppm, it may be appropriately washed,
Coagulation using a known coagulant, washing, and the like
It is preferable to adjust the ratio of 2-b). When a coagulant is used, the counter ion of the component (C2-b) may be different from the original ion in some cases. Component (C2-b) is 0.2 parts by weight based on 100 parts by weight of the acrylic rubber-based grafted copolymer (C2-a).
It is preferably used in the range of 15 to 15 parts by weight, more preferably 0.3 to 12 parts by weight. If the amount is less than 0.2 parts by weight, the acrylic rubber-based graft copolymer (C2-
In some cases, the production of a) may be unstable. On the other hand, when it exceeds 15 parts by weight, the obtained graft copolymer composition (C-
The particle size of 2) cannot be controlled, and the impact strength of the aromatic polycarbonate resin composition may be insufficient.

The olefin copolymer (C-3) used as the rubbery polymer (C) is a copolymer of an α-olefin having 3 or more carbon atoms and an unsaturated carboxylic acid ester. Examples of the α-olefin having 3 or more carbon atoms include propylene, butyne-1, hexene-1, thicene-1, 4-methylbutene-1, and 4-methylpentene-1. The unsaturated carboxylic acid ester is preferably an unsaturated carboxylic acid having 3 to 8 carbon atoms, for example, an alkyl ester such as acrylic acid and methacrylic acid. Specifically, methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl methacrylate, isobutyl acrylate, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate And n-butyl methacrylate and isobutyl methacrylate, among which ethyl acrylate and methyl methacrylate are preferred. The olefin-based copolymer may be a terpolymer with an unsaturated dicarboxylic acid such as maleic acid, fumaric acid, anhydrides or esters of these acids, or a derivative thereof.

The (C-1) acrylic rubber-based graft copolymer, (C-2) acrylic rubber-based graft copolymer composition and (C-3) olefin-based copolymer described above are each used alone. Alternatively, two or more kinds can be mixed and used as the rubbery polymer (C), and it is particularly preferable to use the acrylic rubber-based graft copolymer alone (C-1). The rubbery polymer (C) in the aromatic polycarbonate resin composition of the present invention not only improves the impact strength of the finally obtained resin composition, but also has the effect of suppressing a decrease in the molecular weight of the aromatic polycarbonate resin. Have.
Such an effect is obtained because the rubbery polymer (C) has a higher affinity for titanium oxide than the aromatic polycarbonate resin, so that when the aromatic polycarbonate resin composition is kneaded and melted, the aromatic polycarbonate resin and the oxidized polycarbonate resin are oxidized. It is considered that this is caused by reducing the contact area with titanium.

(C) The mixing ratio of the rubbery polymer is (A)
The amount is 0.5 to 20 parts by weight, preferably 1 to 10 parts by weight, based on 100 parts by weight of the resin composition comprising the aromatic polycarbonate resin and (B) titanium oxide. If the amount is less than 0.5 part by weight, when the finally obtained aromatic polycarbonate resin composition is molded to produce a molded product, sufficient mechanical properties, particularly impact strength cannot be obtained, and the aromatic polycarbonate resin Has a reduced molecular weight. on the other hand,
If the amount exceeds 20 parts by weight, the heat resistance and rigidity of the finally obtained aromatic polycarbonate resin composition will decrease.

The aromatic polycarbonate resin composition of the present invention may contain (D) a flame retardant. (D) The flame retardant is not particularly limited, but is preferably a flame retardant selected from a halogen-based flame retardant and a phosphate ester-based flame retardant. Examples of the halogen-based flame retardant include aromatic halogen compounds, halogenated epoxy resins, halogenated polycarbonate resins, halogenated aromatic vinyl polymers, halogenated cyanurate resins, halogenated polyphenyl ethers, halogenated polyphenylthioethers, and the like. Preferably, decabromodiphenyl oxide, brominated bisphenol-based epoxy resin, brominated bisphenol-based phenoxy resin, brominated bisphenol-based polycarbonate resin, brominated polystyrene resin, brominated cross-linked polystyrene resin, brominated bisphenol-based cyanurate resin, brominated Polyphenylenoxide,
Polydibromodiphenyl oxide bisphenol condensates (tetrabromobisphenol A, oligomers thereof, etc.). Phosphoric acid esters or oligomeric phosphoric acid esters can be used as the phosphoric ester flame retardant. Examples of the phosphoric acid ester include a phosphoric acid ester obtained by reacting an alcohol or a phenol compound with a phosphorus compound such as phosphorous oxychloride or phosphorus pentachloride. When a divalent phenol compound (for example, resorcin, hydroquinone, diphenol compound) is used, an oligomeric phosphate ester can be obtained. Specific examples of the phosphate ester-based flame retardants include trimethyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, tributoxycotyl phosphate, triphenyl phosphate, tricresyl phosphate, tricresyl phenyl phosphate, and cresyl phenyl phosphate. Non-halogen phosphates such as octyldiphenyl phosphate, tris (chloroethyl) phosphate, tris (dichloropropyl) phosphate, bis (2,3-dibromopropyl) 2,3-dichloropropylphosphate, tris2,3-dibromopropyl) Examples thereof include halogen-containing esters such as phosphate and bis (chloropropyl) monooctyl phosphate.
Among them, particularly preferred flame retardants include carbonate oligomers mainly composed of tetrabromobisphenol A, for example, tetrabromobisphenol A
And copolymerized polycarbonate oligomers of tetrabromobisphenol A and bisphenol A, and the like.

The aromatic polycarbonate resin composition of the present invention may further contain (E) polytetrafluoroethylene having a fibril-forming ability in order to further improve flame retardancy. Here, (E) polytetrafluoroethylene having fibril-forming ability refers to AST
It is classified as type 3 in the M standard. Polytetrafluoroethylene having a fibril-forming ability is commercially available, for example, as Teflon 6J from DuPont Mitsui Fluorochemicals Co., Ltd., or as Polyflon TFEF-201 from Daikin Industries, Ltd., and can be easily obtained.

The mixing ratio of the flame retardant (D) is 2 to 20 parts by weight based on 100 parts by weight of the total of (A) the aromatic polycarbonate resin, (B) titanium oxide and (C) the rubber polymer. And preferably 3 to 15 parts by weight. If the amount is less than 2 parts by weight, a sufficient flame retardant effect is not exhibited, and if it exceeds 20 parts by weight, the heat resistance and mechanical strength of the aromatic polycarbonate resin composition are reduced. The mixing ratio of (E) polytetrafluoroethylene is 0 to 2 parts by weight based on 100 parts by weight of the total of (A) the aromatic polycarbonate resin, (B) titanium oxide, and (C) the rubbery polymer. is there. (E)
Polytetrafluoroethylene is preferably blended in the range of 0 to 2 parts by weight depending on the intended flame retardant level.
Normally, the flame retardancy improves with an increase in the blending amount,
Even if it exceeds 2 parts by weight, no significant improvement in flame retardancy is observed. Further, the mixing ratio is preferably 2 parts by weight or less from the viewpoint that the appearance of the molded article of the aromatic polycarbonate resin composition deteriorates and the mechanical strength decreases.

The aromatic polycarbonate resin composition of the present invention contains other resins such as polyester, polyamide, ABS, polyphenylene ether and the like, for example, talc, mica, glass fiber, carbon fiber and the like, as long as the object of the present invention is not impaired. Further, reinforcing materials such as whiskers such as fibrous titanium oxide, potassium titanate whiskers, and aluminum borate whiskers can be blended. The aromatic polycarbonate resin composition of the present invention may contain various additives in an amount exhibiting its effect, if necessary, for example, phosphites and phosphates as stabilizers, and hinder as an antioxidant. It may contain a dophenolic compound or the like, a fluidity modifier such as polycaprolactone, other release agents, ultraviolet absorbers, antistatic agents, dyes and pigments, and the like.

The aromatic polycarbonate resin composition of the present invention comprises (A) an aromatic polycarbonate resin, (B) titanium oxide, (C) a rubber polymer, and (D) a flame retardant,
(E) It can be produced by mixing polytetrafluoroethylene and the like. For example, each component is charged into a V-type blender, ribbon mixer, tumbler, or the like, uniformly mixed, melt-kneaded by a normal single-screw or twin-screw extruder, cooled, and then cut into pellets. At this time, a part of the filler such as titanium oxide and other components may be added in the middle of the extruder. Alternatively, after some of the components are previously mixed and kneaded, the remaining components may be added and extruded. The aromatic polycarbonate resin composition thus obtained can be easily molded by extrusion molding, injection molding, or compression molding, and can also be applied to blow molding, vacuum molding, and the like. This aromatic polycarbonate resin composition has high light reflection characteristics and excellent mechanical characteristics, and is most suitable as a material for a liquid crystal backlight reflector of electronic and electrical, OA, and the like.

[0033]

The present invention will be described in more detail with reference to the following examples and comparative examples. "Parts" in the description is "parts by weight"
And “%” indicates “% by weight”. (Production Example 1) Acrylic rubber-based graft copolymer (C-
Production of 1) 99.5 parts of 2-ethylhexyl acrylate and 0.5 part of allyl methacrylate were mixed to obtain 100 parts of a (meth) acrylate monomer mixture. Alkenyl succinic acid dipotassium salt The a (meth) acrylate monomer mixture 100 parts was added to distilled water 195 parts was dissolved 1 part, after pre-stirring at 10,000rpm with a homomixer, a pressure of 300 kg / cm ² by a homogenizer To obtain a (meth) acrylate emulsion. This mixed solution was transferred to a separable flask equipped with a condenser and a stirring blade, and heated while being replaced with nitrogen and mixed and stirred. When the temperature reached 50 ° C, 0.5 part of tert-butyl hydroperoxide was added, and the temperature was raised to 50 ° C. Warm and sulfuric acid 1
A mixture of 0.002 parts of iron, 0.006 parts of disodium ethylenediaminetetraacetate, 0.26 parts of Rongalit and 5 parts of distilled water was left to stand for 5 hours to complete the polymerization, and the acrylic rubber (Ca1) component latex I got The polymerization rate of the obtained acrylic rubber (Ca1) component latex is 9
9.9%. The latex was coagulated and dried with ethanol to obtain a solid, which was extracted with toluene at 90 ° C. for 12 hours, and the gel content was measured to be 92.4% by weight. The acrylic rubber (Ca1) component latex is
The poly-2-ethylhexyl acrylate containing allyl methacrylate was sampled so as to have a solid content of 20 parts, placed in a separable flask equipped with a stirrer, and added so that the amount of distilled water in the system became 195 parts.

Next, a mixed liquid of 68 parts of n-butyl acrylate containing 2.0% of allyl methacrylate constituting the acrylic rubber (Ca2) component and 0.32 parts of tert-butyl hydroperoxide was charged, and stirred for 10 minutes. This mixture was permeated into acrylic rubber (Ca1) component particles. Further, 0.5 part of polyoxyethylene ether sulfate was added, and the mixture was further stirred for 10 minutes, followed by purging with nitrogen, raising the temperature of the system to 50 ° C., and adding 0.002 ferrous sulfate.
Parts, disodium ethylenediaminetetraacetate 0.006
Parts, a mixed solution of 0.26 parts of Rongalite and 5 parts of distilled water were charged to start radical polymerization, and then kept at an internal temperature of 70 ° C. for 2 hours to complete the polymerization and complete the acrylic rubber (Ca1)
A latex of a polyalkyl (meth) acrylate-based composite rubber comprising a component and an acrylic rubber (Ca2) component was obtained. A part of this latex was collected and used for measurement of the particle size distribution of the polyalkyl (meth) acrylate-based composite rubber. Table 1 shows the measurement results of the particle size distribution. Further, this latex was dried to obtain a solid substance, and 90 ° C.
Extracted for 12 hours and measured gel content 98.3%
Met. A mixture of 0.06 parts of tert-butyl hydroperoxide and 12 parts of methyl methacrylate was added dropwise to the polyalkyl (meth) acrylate-based composite rubber latex at 70 ° C. for 15 minutes.
For 4 hours to complete the graft polymerization onto the polyalkyl (meth) acrylate-based composite rubber. The polymerization rate of methyl methacrylate was 99.4%. The obtained acrylic rubber-based graft copolymer latex was dropped into 200 parts of hot water containing 1.5% of calcium chloride, coagulated, separated, washed, and dried at 75 ° C. for 16 hours to obtain a powdery acrylic rubber-based graft. A copolymer (C-1) was produced. Further, the glass transition temperature of the acrylic rubber-based graft copolymer (C-1) was measured. The measured glass transition temperature is a value derived from a polyalkyl (meth) acrylate-based composite rubber. Table 1 shows the results. The particle size distribution measurement and the glass transition temperature measurement were performed as follows.

Measurement of Particle Size Distribution of Polyalkyl (meth) acrylate Composite Rubber The obtained latex was diluted with distilled water as a sample and measured using a CHDF2000 type particle size distribution meter manufactured by MATEC, USA. The measurement was performed under standard conditions recommended by MATEC. Using a dedicated capillary cartridge for particle separation and a carrier liquid, the liquidity is almost neutral, the flow rate is 1.4 ml / min, and the pressure is about 4000 ps.
i. While maintaining the temperature at 35 ° C., 0.1 ml of a diluted latex sample having a concentration of about 3% was used for measurement. As the standard particle size substance, a total of 12 points of monodisperse polystyrene having a known particle diameter manufactured by DUKE in the United States were used within a range of 0.02 μm to 0.8 μm. Measurement of glass transition temperature of acrylic rubber-based graft copolymer 70 parts of the obtained acrylic rubber-based graft copolymer and 30 parts of polymethyl methacrylate (PMMA) were added together in 25 parts.
Pellets were formed with a 25 ° uniaxial extruder at 0 ° C. Then, using a press machine set at 200 ° C., a plate prepared to a thickness of 3 mm was cut out to a width of about 10 mm and a length of about 12 mm.
Instruments DMA 983,
Measured under the condition of a heating rate of 2 ° C./min, the obtained Tan
The temperature corresponding to the transition point of the δ curve was determined as the glass transition temperature.

(Production Example 2) Production of acrylic rubber-based graft copolymer composition (C-2) 99.5 parts of 2-ethylhexyl acrylate and 0.5 part of allyl methacrylate were mixed, and a (meth) acrylate monomer was prepared. 100 parts of the mixture were obtained. 100 parts of the above (meth) acrylate monomer mixture was added to 195 parts of distilled water obtained by dissolving 1 part of Perex SS-H (registered trademark) commercially available from Kao Corporation as solids as sodium alkyldiphenyl ether disulfonate, After preliminary stirring with a homomixer at 10,000 rpm, the mixture was emulsified and dispersed at a pressure of 300 kg / cm ² by a homogenizer to obtain a (meth) acrylate emulsion. This mixed solution was transferred to a separable flask equipped with a condenser and a stirring blade, and heated while being replaced with nitrogen and mixed and stirred. When the temperature reached 50 ° C, 0.5 part of tert-butyl hydroperoxide was added, and the temperature was raised to 50 ° C. Warm and sulfuric acid 1
A mixed solution of 0.002 parts of iron, 0.006 parts of disodium ethylenediaminetetraacetate, 0.26 parts of Rongalite and 5 parts of distilled water was charged. Thereafter, the mixture was left for 5 hours to complete the polymerization, thereby obtaining an acrylic rubber (Ca1) component latex.
The polymerization rate of the obtained acrylic rubber (Ca1) component latex was 99.9%. This latex was coagulated and dried with ethanol to obtain a solid, which was then heated at 90 ° C with toluene.
Extraction was performed for 12 hours, and the gel content was measured to be 93.7% by weight. Further, 7.0 parts of Perex SS-H was added as a solid content to the obtained latex. The latex of the acrylic rubber (Ca1) component was collected so that the solid content of poly-2-ethylhexyl acrylate containing allyl methacrylate was 20 parts, placed in a separable flask equipped with a stirrer, and the amount of distilled water in the system was reduced to 195. Department. At this time, 0.8 part of Perex SS-H is present as a solid content in this latex.

Next, a mixed solution of 68 parts of n-butyl acrylate containing 2.0% of allyl methacrylate constituting the acrylic rubber (Ca2) component and 0.32 parts of tert-butyl hydroperoxide was charged and stirred for 10 minutes. This mixture was permeated into acrylic rubber (Ca1) component particles. After further stirring for 10 minutes, the atmosphere in the system was replaced with nitrogen, the temperature of the system was raised to 50 ° C., and 0.002 parts of ferrous sulfate were added.
0.006 parts of disodium ethylenediaminetetraacetate,
A mixed solution of 0.26 parts of Rongalite and 5 parts of distilled water was charged to start radical polymerization, and then kept at an internal temperature of 70 ° C. for 2 hours. The polymerization was completed to complete the acrylic rubber (Ca1) component and the acrylic rubber (Ca2) component Of polyalkyl (meth) acrylate-based composite rubber was obtained. A part of this latex was collected and used for measurement of the particle size distribution of the polyalkyl (meth) acrylate-based composite rubber. Table 1 shows the measurement results of the particle size distribution measured in the same manner as in Production Example 1. Further, this latex was dried to obtain a solid, which was extracted with toluene at 90 ° C. for 12 hours, and the gel content was measured to be 98.3%. This polyalkyl (meth) acrylate-based composite rubber latex has t
A mixture of tert-butyl hydroperoxide (0.06 part) and methyl methacrylate (12 parts) was added dropwise at 70 ° C. for 15 minutes, and then maintained at 70 ° C. for 4 hours to graft onto a polyalkyl (meth) acrylate-based composite rubber. The polymerization was completed. The conversion of methyl methacrylate is 9
It was 9.4%. The obtained acrylic rubber-based graft copolymer latex was dropped into 200 parts of hot water containing 1.5% by weight of aluminum sulfate, coagulated, separated and washed, and then 75 ° C.
For 16 hours to produce a powdery acrylic rubber-based graft copolymer composition (C-2). Further, the glass transition temperature of this acrylic rubber-based graft copolymer composition (C-2) was measured in the same manner as in Production Example 1. The measured glass transition temperature is a value derived from a polyalkyl (meth) acrylate-based composite rubber. Table 1 shows the results.

[0038]

[Table 1]

Examples 1 to 15 and Comparative Examples 1 to 7
(A) As an aromatic polycarbonate resin, bisphenol A type polycarbonate manufactured by Mitsubishi Engineering-Plastics Corporation (Iupilon S-3000: PC in the table)
After drying at 120 ° C. for 5 hours, (B) titanium oxide, (C) rubbery polymer, (D) various flame retardants, (E) fibrillated polytetrafluoroethylene, organic A silicon compound as a system surface treatment agent and a glass fiber as a reinforcing material were blended in the amounts shown in Tables 2, 4, and 6, respectively. Further, 0.05 part by weight of a phosphorus-based stabilizer (trimethyl phosphate): TMP manufactured by Daihachi Chemical Industry Co., Ltd. is added to 100 parts of the aromatic polycarbonate resin (A) and titanium oxide (B) in total. Added and mixed by blender. Then, using a vent-type twin-screw extruder (30 mm diameter manufactured by Werner), the mixture was extruded while being degassed at a cylinder temperature of 280 ° C., and pelletized. After the obtained pellets were dried with a hot air circulating drier at 120 ° C. for 6 hours, a test piece and a sample plate were prepared. Then, the following physical properties were evaluated for these. The evaluation results are shown in Tables 3, 5, and 7.

The physical properties were evaluated by the following methods. (A) Production of test piece and sample plate Sample plate, impact strength and load deflection temperature measurement test piece, flame retardant test piece at cylinder temperature of 280 ° C and mold temperature of 80 ° C by injection molding machine “Toshiba Machine IS-100EN” Were molded. The test piece for measuring the impact strength and the deflection temperature under load and the flame-retardant test piece were subjected to measurement after being molded and kept at a temperature of 23 ° C. and a humidity of 50% for 48 hours. (B) Viscosity average molecular weight Viscosity average molecular weight (Mv)
The specific viscosity ηsp obtained from a solution obtained by dissolving 0.7 g of the sample in 0 ml was inserted into the following equation. ηsp / c = [η] +0.45 [η] 2C [η] = 1.23 × 10 −4 Mv0.83 (where C = 0.7) (c) Impact strength Thickness according to ASTM D256 The 1/8 "test piece was measured for its Izod notched impact strength (J / m ² ). (D) Deflection temperature under load According to JIS K7207, a load of 18.5 kgf / cm.
Measured at ² . (E) Light reflectivity Using a sample plate having a thickness of 2 mm, a wavelength of 450 to 800 nm was measured using a color eye MS2020PLUS manufactured by Macbeth.
Was evaluated at the lowest reflectance value. Those that were 92% or more were regarded as acceptable, and represented by the symbol 号 in the table. (F) Combustion test Using a UL standard 94-V combustion test specimen of 5 "x 1/2" x 1/24 ", evaluation was made by the UL standard 94-V plastic combustion test method.

[0041]

[Table 2] Abbreviations in the table indicate the following. Ti-1: Titanium oxide RTC-2 manufactured by Thai Oxide
(Crystal system = rutile, Production method = Chlorine method, Main treatment agent = Alumina / Silica / Dimethylpolysiloxane) Ti-2: Titanium oxide manufactured by Ishihara Sangyo Co., Ltd .: CR-50
(Crystal system = rutile, production method = chlorine method, main treatment agent = alumina) Ti-3: Titanium oxide manufactured by Ishihara Sangyo Co., Ltd .: CR-93
(Crystal system = rutile, production method = chlorine method, main treating agent = alumina / silica) Ti-4: Titanium oxide manufactured by Ishihara Sangyo Co., Ltd .: PC-2
(Crystal system = rutile, production method = chlorine method, main treating agent = alumina / silica / methylhydrogenpolysiloxane) C-1: acrylic rubber-based graft copolymer obtained in Production Example 1 C-2: Production Example Acrylic rubber-based graft copolymer composition obtained in 2 EEA: Ethylene-ethyl acrylate copolymer Lexlon A4250 MBS manufactured by Nippon Petrochemical Industry Co., Ltd. Butadiene-alkyl acrylate-alkyl methacrylate copolymer manufactured by Kureha Chemical Industry Co., Ltd. Polymer EXL
-2602 PE: Polyethylene resin HI-ZEX 2100JP, manufactured by Mitsui Chemicals, Inc. Si-1: Methyltrimethoxysilane KBM-13, manufactured by Shin-Etsu Chemical Co., Ltd. Si-2: N-β (aminoethyl), manufactured by Shin-Etsu Chemical Co., Ltd. ) -Γ-Aminopropyltrimethoxysilane KBM-
603

[0042]

[Table 3]

[0043]

[Table 4] Abbreviations in the table indicate the following. FR-1: Tetrabromobisphenol A polycarbonate oligomer, Fireguard FG-7000, manufactured by Teijin Chemicals Ltd. FR-2: Brominated epoxy resin, Platherm EP-100, manufactured by Dainippon Ink Co., Ltd. FR-3: Daihachi Chemical Industry Co., Ltd. ) Triphenyl phosphate TPP FR-4: Daihachi Chemical Industry Co., Ltd. oligomeric phosphate ester PX-200 PTFE: Daikin Industries, Ltd. Fibrillated polytetrafluoroethylene polyfuron TEF F-201L

[0044]

[Table 5]

[0045]

[Table 6] The glass fiber was chopped glass fiber manufactured by Nippon Electric Glass Co., Ltd .: ECS03T-511 / P (13 μm in diameter).
m, length 3 mm).

[0046]

[Table 7]

As is clear from the above table, Examples 1 to
The molded article of the aromatic polycarbonate resin composition of No. 15 is
The impact strength, light reflectance and heat resistance were all excellent. In addition, the decrease in the molecular weight of the aromatic polycarbonate during extrusion and molding was small. Further, those to which the flame retardant (D) and the PTFE (E) having a fibril-forming ability were added also exhibited high flame retardancy. On the other hand, the molded articles of the aromatic polycarbonate resin compositions of Comparative Examples 1, 4, and 5 were all poor in impact strength and light reflectance. The molded article of the aromatic polycarbonate resin composition of Comparative Example 3 had low impact strength. The molded article of the aromatic polycarbonate resin composition of Comparative Example 6 had low heat resistance. The molded article of the aromatic polycarbonate resin composition of Comparative Example 7 to which glass fiber was added also had low impact strength and low light reflectance.

[0048]

As described above, according to the present invention, it is possible to easily prepare an aromatic polycarbonate resin composition having high light reflection characteristics, excellent heat stability, and excellent mechanical characteristics such as impact strength. Can be provided. Since the aromatic polycarbonate resin composition of the present invention does not have a decrease in reflectance due to yellowing caused by MBS or the like, it is most suitable for use in a reflector.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 23/00 C08L 23/00 27/18 27/18 51/00 51/00 G02B 1/04 G02B 1 / 04 5/08 5/08 A G02F 1/1335 520 G02F 1/1335 520 F Term (Reference) 2H042 DA00 DC00 DE00 2H091 FA14Z LA30 4J002 BB142 BB162 BC113 BD154 BG042 BG052 BN122 CD123 CG011 CG021 CG033 CH073 CM023 CN01 FA013 FB086 FB096 FB146 FB266 FD010 FD133 FD137 GP00 4J026 AA45 AA46 AC09 AC18 AC22 AC31 AC34 BA05 BA06 BA27 BA31 DA04 DA07 DB04 DB08 FA03 GA09

Claims (10)

[Claims] (A) Aromatic polycarbonate resin 95
Aromatic polycarbonate resin in which (C) 0.5 to 20 parts by weight of a rubbery polymer is blended with respect to 100 parts by weight of a resin composition comprising (B) 5 to 40% by weight of titanium oxide and (B) 5 to 40% by weight of titanium oxide. (C) a rubbery polymer, wherein (C-1) an acrylic rubber-based graft copolymer, (C-2) an acrylic rubber-based graft copolymer composition, and (C-3) an olefin. An aromatic polycarbonate resin composition, which is at least one member selected from the group consisting of a series copolymer. (C-1) an acrylic rubber-based graft copolymer obtained by graft-polymerizing a vinyl-based monomer (C1-b) onto a polyalkyl (meth) acrylate-based composite rubber (C1-a); ) Acrylate-based composite rubber (C1-
a) contains two or more types of acrylic rubber components having different glass transition temperatures, and each of the aforementioned acrylic rubber components has 2
The number distribution of the particle diameter of the polyalkyl (meth) acrylate-based composite rubber (C1-a) is 20% by weight or less and contains a monomer having at least one unsaturated bond in an amount of 20% by weight or less.
Particles having a bidisperse distribution having at least two peaks in the range of 5 μm to 0.4 μm, and in which 70% by weight or more of the polyalkyl (meth) acrylate-based composite rubber (C1-a) is 0.05 to 0.4 μm An acrylic rubber-based graft copolymer, which is a particle having a diameter. (C-2) Acrylic rubber-based graft copolymer (C2-
An acrylic rubber-based graft copolymer composition containing a) and a component (C2-b) containing one or more components selected from the group consisting of sulfonic acid, sulfonate, sulfuric acid and sulfate. The acrylic rubber-based graft copolymer (C2-a)
Polyalkyl (meth) acrylate-based composite rubber (C1-
a) is a graft copolymer in which a vinyl monomer (C1-b) is graft-polymerized, and a polyalkyl (meth) acrylate-based composite rubber (C1-a) has two or more types having different glass transition temperatures. An acrylic rubber-based graft copolymer composition comprising an acrylic rubber component, wherein each of the acrylic rubber components contains a monomer having two or more unsaturated bonds in a molecule in an amount of 20% by weight or less. . (C-3) An olefin copolymer comprising an α-olefin having 3 or more carbon atoms and an unsaturated carboxylic acid ester. 2. The polyalkyl (meth) acrylate-based composite rubber (C1-a) is selected from 2-ethylhexyl acrylate, ethoxyethoxyethyl acrylate, methoxytripropylene glycol acrylate, 4-hydroxybutyl acrylate, lauryl methacrylate, and stearyl methacrylate. An acrylic rubber (Ca1) component containing at least one of the following as a component, and an acrylic rubber (Ca1) containing n-butyl acrylate as a component
2) The glass transition temperature (T) derived from the acrylic rubber (Ca1) component
g1) is lower than the glass transition temperature (Tg2) derived from the acrylic rubber (Ca2) component.
The aromatic polycarbonate resin composition according to the above. 3. The polyalkyl (meth) acrylate-based composite rubber (C1-a) has a particle diameter of 0.05 to 0.4 μm.
50 to 99.9% by weight of particles having a particle diameter of 0.4 to 1.
0 to 50% by weight of particles having a particle size of 0 μm, and
The aromatic polycarbonate resin composition according to claim 1, wherein the average particle diameter is 0.8 μm or less. 4. The fragrance according to claim 1, wherein the titanium oxide (B) is a titanium oxide treated with an alkylalkoxysilane and / or an amino-based silane coupling agent. Aromatic polycarbonate resin composition. 5. A flame retardant (2) to (2) based on 100 parts by weight of the aromatic polycarbonate resin composition according to claim 1.
An aromatic polycarbonate resin composition further comprising 0 parts by weight and 0 to 2 parts by weight of (E) polytetrafluoroethylene having a fibril-forming ability. 6. The aromatic polycarbonate resin composition according to claim 5, wherein (D) the flame retardant is a halogen-based flame retardant and / or a phosphate ester-based flame retardant. 7. The aromatic polycarbonate resin composition according to claim 6, wherein (D) the flame retardant is a carbonate oligomer mainly composed of tetrabromobisphenol A. 8. The rubbery polymer (C) is a polyalkyl (meth) acrylate-based composite rubber (C1-a) 80 to 9
9.9% by weight of the vinyl monomer (C1-b) 20 to
0.1% by weight is a graft-polymerized acrylic rubber-based graft copolymer (C-1), and a polyalkyl (meth) acrylate-based composite rubber (C1-
a) contains two or more types of acrylic rubber components having different glass transition temperatures, each acrylic rubber component contains a monomer having two or more unsaturated bonds in a molecule in a range of 20% by weight or less, and The number distribution of the particle diameter of the polyalkyl (meth) acrylate-based composite rubber (C1-a) is 0.05 μm.
The polydisperse distribution has at least two peaks at m to 0.4 μm, and 70% by weight or more of the polyalkyl (meth) acrylate-based composite rubber (C1-a) is 0.1%.
The aromatic polycarbonate resin composition according to claim 5, which is a graft copolymer which is a particle having a particle diameter of from 05 µm to 0.4 µm. 9. The fragrance according to claim 5, wherein the titanium oxide (B) is a titanium oxide treated with an alkylalkoxysilane and / or an amino-based silane coupling agent. Aromatic polycarbonate resin composition. 10. A molded article molded from the aromatic polycarbonate resin composition according to any one of claims 1 to 9.