JPH08199055A - Flame-retardant polycarbonate resin composition with excellent light resistance, moldability and impact resistance - Google Patents

Abstract

PURPOSE: To obtain a resin compsn. excellent in light resistance, moldability, impact resistance, heat resistance, weld strength. and flame retardance by compounding a specific resin mixture contg, a polycarbonate resin with specific additives. CONSTITUTION: A resin mixture is prepd. by mixing a polycarbonate resin, a multistage graft copolymer obtd. by successively grafting specified amts. of an acrylic ester, an arom. vinyl monomer, and a vinyl cyanide monomer onto a specified amt. of a rubbery polymer contg. 50wt.% or higher butadiene units and having a specified particle size, and a copolymer formed from specified amts. of a vinyl cyanide monomer and an arom. vinyl monomer. The mixture is compounded with compds. of formulas I (wherein n is 35-100; X is H, Cl, or Br; i to l are each 1-4; and R<1> and R<2> are each epoxy) and II (wherein n is 0-10; and R<3> and R<4> are each R<1> ) having a specified degree of halogenation, an Sb compd., and compds. of formulas III (wherein R<5> and R<6> are each H or 1-10C alkyl) and IV (wherein R<7> to R<10> are each a group of formula V; and R<11> is alkyl) each in a specified amt.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a flame-retardant polycarbonate resin composition having excellent light resistance, moldability and impact resistance.

[0002]

2. Description of the Related Art As a method for making a mixture of a polycarbonate resin and an ABS resin, an AAS resin, or the like flame-retardant, some methods have been heretofore proposed. Various halogen compounds or antimony compounds are used together. Further, it is well known that a benzotriazole-based ultraviolet absorber and a sterically hindered amine-based light stabilizer are used in combination for improving these light resistances.

For example, Japanese Patent Laid-Open No. 1-22958 discloses that a blend of a polycarbonate resin and a rubber-reinforced vinyl copolymer is flame retarded by adding a high molecular weight brominated epoxy compound and antimony trioxide. Is proposed.

Further, in JP-A-6-25522,
It has been proposed to improve the weld strength by blending two kinds of halogen compounds having a specific chemical structure having specific molecular weights different from each other in a specific ratio in a flame retardant polycarbonate resin composition.

However, although the resin composition obtained by the above method is excellent in flame resistance, heat resistance and weld strength, it is still insufficient in light resistance and impact resistance.
Currently, flame-retardant polycarbonate resins are widely used in office automation equipment and the like, but there is a strong demand for improvement in light resistance in order to reduce discoloration due to fluorescent lamps and other light. Also,
A high degree of moldability and impact strength are required due to the thinning of molded products.

In view of such circumstances, the present inventors have maintained flame retardancy, heat resistance and weld strength, and have light resistance,
The present invention has been achieved as a result of intensive research conducted for the purpose of providing a flame-retardant polycarbonate resin having excellent moldability and impact resistance.

[0007]

SUMMARY OF THE INVENTION The above objects of the present invention are as follows.
A resin composition comprising the following components (A) to (H), wherein the component (A) is 50 to 90 parts by weight and the component (B) is 10 to 5:
The total amount of the component (D) and the component (E) is 5 to 40 parts by weight (however, the component (D) / ((D) component / ( E)
The ratio with the components is 2.0 to 0.25 by weight),
The component (F) is 2 to 30 parts by weight, and the component (G) is 0.01 to.
2.0 parts by weight and 0.01 to 1.0 parts by weight of the component (H) (however, the ratio of the component (G) / the component (H) is 0.5 to 20). It is achieved by a flame-retardant polycarbonate resin composition excellent in light resistance, moldability and impact resistance, which is characterized by being blended with

(A) Polycarbonate resin.

(B) An average particle diameter of at least 50% by weight consisting of butadiene units 0.25 to 0.50 μm
In the presence of 5 to 80 parts by weight of the rubbery polymer (a) of
As the graft polymerization monomer for the second step, 2 to 50 parts by weight of the acrylic acid ester monomer (b) is graft-polymerized, and then the aromatic vinyl monomer is used as the graft polymerization monomer for the second and subsequent steps. 10-85% by weight of the monomer (i), 5-40% by weight of the vinyl cyanide monomer (ii) and 0-35% by weight of another vinyl monomer (iii) copolymerizable therewith (these (i )-(Iii) The total amount of the components is 100% by weight) 93-18 parts by weight of the vinyl monomer (c) (these (a)-
A multistage graft copolymer obtained by graft-polymerizing (c) the total amount of the component (100 parts by weight).

(C) Copolymer obtained by polymerizing 15 to 40% by weight of vinyl cyanide monomer, 60 to 85% by weight of aromatic vinyl monomer and 0 to 35% by weight of other vinyl monomer. .

(D) A high molecular weight halogen compound represented by the following general formula (I) having a halogenation ratio of 10% by weight or more.

Embedded image

(E) A low molecular weight halogen compound represented by the following general formula (II) having a halogenation ratio of 10% by weight or more.

[Chemical 6]

(F) Antimony compound.

(G) A benzotriazole type ultraviolet absorber which is a compound represented by the following general formula (III) or a condensate of the compound.

[Chemical 7]

(H) A sterically hindered amine light stabilizer represented by the following general formula (IV).

Embedded image

The present invention will be described in detail below. First, each component of the present invention will be described. (A) Polycarbonate resin Polycarbonate resin (A) used in the present invention
Is a 4,4'-dioxyarylalkane-based polycarbonate, and a carbonate of 2,2 '-(4,4'-dihydroxydiphenyl) propane is particularly preferable, but a small amount of a polyterephthalate carbonate copolymer was blended. Things are also used.

Resin components (A), (B) and (C) 10
The proportion of the polycarbonate resin (A) in 0 parts by weight is 50
~ 90 parts by weight, the amount of polycarbonate resin is 50
If the amount is less than parts by weight, impact resistance tends to decrease and weld strength tends to decrease. On the other hand, if the polycarbonate resin exceeds 90 parts by weight, the fluidity at the time of molding and the chemical resistance tend to decrease.

(B) Multistage Graft Copolymer Further, the multistage graft copolymer (B) in the present invention is
The first stage monomer for graft polymerization in the presence of 5 to 80 parts by weight of a rubbery polymer (a) having an average particle size of 0.25 to 0.50 μm, in which at least 50% by weight is composed of butadiene units. As an acrylic acid ester monomer (b)
2 to 50 parts by weight are graft-polymerized, and then, as a monomer for graft polymerization in the second and subsequent stages, aromatic vinyl monomer (i) 10 to 85% by weight, vinyl cyanide monomer (ii)
A vinyl monomer comprising 5 to 40% by weight and another copolymerizable vinyl monomer (iii) 0 to 35% by weight (the total amount of these components (i) to (iii) is 100% by weight). (C) 93 to 18 parts by weight (the total amount of these components (a) to (c) is 100 parts by weight) is obtained by graft polymerization.

Examples of the rubbery polymer (a) include polybutadiene and a butadiene-styrene copolymer having a butadiene unit content of 50% by weight or more, a butadiene-acrylonitrile copolymer, and the like. These may be used alone or in combination of two or more. Further, a rubbery polymer (a) having an average particle shape of 0.25 to 0.50 μm may be obtained by using a thickening agent or the like. If the average particle size of the rubbery polymer (a) is out of this range, the impact resistance will be reduced.

When the amount of the rubber-like polymer in the multi-stage graft copolymer (B) is less than 5 parts by weight, the molded product from the obtained resin composition has poor impact resistance, and when it exceeds 80 parts by weight. In this case, the rubbery polymer is apt to aggregate, and the fluidity of the resin becomes poor.

The acrylic acid ester monomer used as the first stage graft polymerization monomer is an acrylic acid alkyl ester having an alkyl group having 1 to 8 carbon atoms, among which ethyl acrylate and butyl acrylate are used. Etc. are preferably used. When the amount of the acrylic acid ester monomer used in the graft polymerization is less than 2 parts by weight, the light resistance of the molded product from the obtained resin composition is poor, and when it exceeds 50 parts by weight, the resistance of the molded product to light is deteriorated. It seems to be inferior in low temperature impact resistance.

In the present invention, ethylene glycol di (meth) acrylate, together with the above-mentioned acrylic acid ester monomer, is added in order to crosslink the rubber and enhance the grafting efficiency during the first stage graft polymerization. It is preferable to use a cross-linking agent such as divinylbenzene and a graft crossing agent such as allyl methacrylate, allyl acrylate, triallyl isocyanurate. The amount thereof used is in the range of 0.05 to 1.0% by weight based on the acrylic acid ester monomer.

Aromatic vinyl monomers used as the monomers for the second and subsequent stages of graft polymerization include styrene and α-
Methyl styrene, o-methyl styrene, 1,3-dimethyl styrene, p-methyl styrene, t-butyl styrene, halogenated styrene, p-ethyl styrene and the like can be mentioned, and these can be used alone or in combination. it can.

Further, examples of the vinyl cyanide monomer used as the monomer for graft polymerization include acrylonitrile, methacrylonitrile, ethacrylonitrile, fumaronitrile and the like, and these can be used alone or in combination. .

Other copolymerizable vinyl monomers that can be used in the graft polymerization include methacrylic acid ester monomers such as methyl methacrylate and ethyl methacrylate, and maleimides such as N-phenylmaleimide. Examples thereof include monomers, but are not particularly limited thereto. This other copolymerizable monomer is optionally used in the range of up to 35% by weight in the graft polymerization monomer from the second stage.

In the multistage graft copolymer (B) of the present invention, it is particularly important that the acrylic ester monomer is graft polymerized in the first stage in the presence of the rubbery polymer, The monomers for graft polymerization after the second step may be mixed and graft polymerized at once, or may be divided and subjected to multi-step graft polymerization.

Resin components (A), (B) and (C) 10
The proportion of the multi-stage graft copolymer (B) in 0 parts by weight is 10
If the amount is less than 10 parts by weight, fluidity, light resistance, etc. are liable to be decreased, and if less than 50 parts by weight,
If it exceeds the weight part, heat resistance and weld strength are deteriorated.

(C) Copolymer The copolymer (C) used in the present invention is 15 to 40% by weight of vinyl cyanide monomer and 60 of aromatic vinyl monomer.
The vinyl cyanide monomer and the aromatic vinyl monomer can be the same as those used in the graft polymer (B).

The content of the vinyl cyanide monomer is 15 to 40% by weight based on the total amount of the monomers used in the copolymer (C). If it is out of this range, at least one of impact resistance, chemical resistance and coloring of the molded product will be poor. The content of the aromatic vinyl monomer is 60 to 85% by weight based on the total amount of the monomers used in the copolymer (C). Sex decreases.

As the copolymer (C), inferior amounts of other copolymerizable vinyl monomers can be used in addition to the above monomers. Examples of these monomers include methacrylic acid esters such as methyl methacrylate, 2-vinylpyridine, 4-
Examples thereof include vinylpyridines such as vinylpyridine and maleimide monomers such as N-phenylmaleimide, but are not particularly limited thereto. These copolymerizable monomers are optionally used in the range of up to 35% by weight in the copolymer (C).

Resin components (A), (B) and (C) 10
The proportion of the copolymer (C) in 0 parts by weight is 0 to 30 parts by weight, and if it exceeds 30 parts by weight, impact resistance and weld strength are likely to be deteriorated.

The copolymer (C) is preferably used in combination when the proportion of the rubbery polymer in the multi-stage graft copolymer (B) is high in terms of moldability and heat resistance.

(D) High molecular halogen compound and (E)
Low molecular weight halogen compound The high molecular weight halogen compound (D) used in the present invention has a halogenation rate of 10% by weight or more, is represented by the above general formula (I), and has an average degree of polymerization n of 35 to 100. Is what is. The low molecular weight halogen compound (E) has a halogenation ratio of 10% by weight or more and has the same molecular structure as that of the high molecular weight halogen compound (D).
I), having an average degree of polymerization n of 0-10.

When the average degree of polymerization n of the high molecular weight halogen compound (D) exceeds 100, the dispersibility in the resin is deteriorated,
There is a tendency that the physical properties are deteriorated and the fluidity at the time of molding is deteriorated. On the other hand, when n is less than 35, impact resistance and heat resistance are deteriorated. When the average degree of polymerization n of the low molecular weight halogen compound (E) exceeds 10, the effect of improving the weld strength is reduced.

The high molecular halogen compound (D) and the low molecular weight halogen compound (E) have epoxy groups at both ends.

The mixing ratio of the high molecular weight halogen compound (D) and the low molecular weight halogen compound (E) is (D).
The weight ratio of component / (E) component is preferably in the range of 2.0 to 0.25. When the weight ratio exceeds 2.0, the effect of improving the weld strength is small, while when the weight ratio is less than 0.25, heat resistance is low. Sex will be reduced.

The total amount of the high molecular weight halogen compound (D) and the low molecular weight halogen compound (E) is 5 with respect to 100 parts by weight of the total amount of the resin components (A), (B) and (C). ~ 40 parts by weight. If it is less than 5 parts by weight, the flame retardancy is lowered, while if it exceeds 40 parts by weight, the mechanical properties are lowered.

(F) Antimony Compound Further, examples of the antimony compound (F) used in the present invention include antimony trioxide, antimony pentoxide, sodium antimonate, and the like, which are commercially available with various surface treatments. However, a surface-treated product may be used.

The compounding ratio of the antimony compound (F) is 2 to 30 parts by weight based on 100 parts by weight of the total amount of the resin components (A), (B) and (C). If it is less than 2 parts by weight, the flame retardant effect is insufficient, while if it exceeds 30 parts by weight, the mechanical properties tend to deteriorate.

(G) Benzotriazole UV Absorber The benzotriazole UV absorber (G) used in the present invention includes 2- (5-methyl-2-hydroxyphenyl) benzotriazole and 2- (3- Tetrabutyl-2-hydroxy-5-methylphenyl) -5-chlorobenzotriazole, 2,2-methylenebis [4-
(1,1,3,3-tetramethylbutyl) -6- (2H
-Benzotriazol-2-yl) phenol] and the like.

Benzotriazole type ultraviolet absorber (G)
The compounding ratio is 0.01 to 2.0 with respect to 100 parts by weight of the total amount of the resin components (A), (B) and (C).
Parts by weight. If it is less than 0.01 part by weight, the effect of improving the light resistance is small, while if it exceeds 2.0 parts by weight, the heat resistance is lowered.

(H) Sterically hindered amine light stabilizer As the sterically hindered amine light stabilizer (H) used in the present invention, N-methyltetrakis (2,2,6,6-tetramethyl-4-) is used. 3,9-bis (1,1-dimethyl-2-
Hydroxyethyl) -2,4,8,10-tetraoxaspiro [5,5] undecane) butanetetracarboxylate, N-methyltetrakis (1,2,2,6,6-)
Pentamethyl-4-piperidyl) 1,2,3,4-butanetetracarboxylate, N-methyltetrakis (2,2,6,6-tetramethyl-4-tridecyl) butanetetracarboxylate and the like can be mentioned. In the compound represented by the general formula (IV), when R ¹¹ is hydrogen, the effect of improving the light resistance is small, which is not preferable.

The mixing ratio of the sterically hindered amine light stabilizer (H) is 0.01 to 1.0 part by weight based on 100 parts by weight of the total amount of the resin components (A), (B) and (C). is there.
If it is less than 0.01 part by weight, the effect of improving the light resistance is small, while if it exceeds 1.0 part by weight, the heat resistance is lowered.

By using these benzotriazole-based UV absorbers (G) and sterically hindered amine-based light stabilizers (H) in combination, the light resistance is improved, and the ratio of use is (G) component / (H) component. Is 0.5 to 20, and more preferably the ratio of the component (G) / the component (H) is 1.0 to 10. If the weight ratio is less than 0.5, the effect of improving the light resistance is small, and the heat resistance tends to decrease. Further, if the weight ratio exceeds 20, the effect of improving the light resistance tends to decrease, and the heat resistance also decreases.

Additives such as modifiers, release agents, stabilizers, dyes and pigments can be added to the resin composition of the present invention as needed.

As a method for preparing the resin composition of the present invention, an apparatus such as a Henschel mixer and a tumbler used for blending ordinary resins can be used. Further, regarding shaping, a device used for usual shaping such as a single-screw extruder, a twin-screw extruder, an injection molding machine or the like can be used.

[0047]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples. “Part” in Examples and Comparative Examples,
"%" Means "part by weight" and "% by weight", respectively. The evaluation of each physical property in the examples was carried out by the following methods.

(1) Izod impact strength It was measured according to ASTM D-256 using a notched test piece of 6.3 mm (thickness).

(2) Heat distortion temperature It was measured according to ASTM D-648. (Bending stress 4.6 kgf / cm ² ).

(3) Short shot pressure (SS pressure) SS pressure is 1 using M-100 "Meiki Seisakusho Co., Ltd."
Cylinder temperature of the 00mm square plate (thickness 3mm) 240 ℃
The minimum pressure that can be used for molding is expressed as a percentage with respect to the maximum pressure of the molding machine (2000 kgf / cm ² ).

(4) Light resistance The light resistance was measured according to ASTM D-4459. The degree of discoloration of the test piece after 200, 400, and 600 hours with a xenon arc weather meter was measured with a color difference meter and expressed as the difference (ΔE) from the unexposed sample.

(5) Weld strength A test piece having a size of 3.2 mm (thickness) × 12.7 (width) × 127 mm (length), in which gates were provided on both sides in the longitudinal direction to cause a weld at the center 3.2mm (thickness) x 12.7mm so that the weld part becomes the fracture center
(Width) × 15 mm (length) was cut out and the Dynestadt impact strength was measured.

(6) Flammability 1.6 mm (thickness) x 12.7 mm (width) x 127 mm
The vertical burning test of UL-94 was performed using the (length) test piece.

The components used in Examples and Comparative Examples are as follows. (A) Polycarbonate resin Mitsubishi Kasei Co., Ltd. bisphenol A type polycarbonate resin having an average molecular weight of 22000.

(B) Graft Copolymer Graft copolymer B-1 obtained by the following production example
~ B-3 was used.

B-1: Copolymerized latex consisting of 20 parts of polybutadiene latex having a solid content of 33% and an average particle diameter of 0.08 μm (as solid content), 85% of n-butyl acrylate units and 15% of methacrylic acid units. 0.5 part (as solid content) was added with stirring, and stirring was continued for 30 minutes to obtain an enlarged rubber latex having an average particle diameter of 0.38 μm.

The following monomer mixture was added to this and sufficiently stirred, and then N-lauroyl sarcosine sodium salt (0.1%) was added.
Five parts were dissolved and the system was replaced with nitrogen to remove oxygen. N-Butyl acrylate 79.55 parts Allyl methacrylate 0.3 parts Ethylene glycol dimethacrylate 0.15 parts t-Butyl hydroperoxide 0.2 parts

Further, the internal temperature was raised to 45 ° C. and the following composition was added. Rongalit 0.5 parts Ferrous sulfate heptahydrate 0.0003 parts Ethylenediaminetetraacetic acid sodium dihydrate 0.0009 parts Pure water 10 parts Then, while stirring at an internal temperature of 75 ° C for 90 minutes, it is a composite rubber. A polymer latex was obtained.

Subsequently, the following composition was charged into a 20 liter reactor equipped with a stirrer. Complex rubbery polymer latex (as solid content) 50 parts N-lauroyl sarcosine sodium 1.2 parts Rongalit 0.4 parts Ferrous sulfate heptahydrate 0.001 part Ethylenediaminetetraacetic acid sodium dihydrate 0.003 Part Pure water 100 parts

Then, the temperature was raised to 75 ° C. with stirring, and the following monomer mixture was added dropwise over 120 minutes to carry out graft polymerization. Acrylonitrile 15 parts Styrene 35 parts t-Butyl hydroperoxide 0.3 parts n-octyl mercaptan 0.1 parts

After the dropping of the monomer mixture, the mixture was held for 1 hour while stirring to obtain a graft copolymer latex. The graft copolymer latex was added to dilute sulfuric acid to coagulate it, followed by dehydration, washing and drying to obtain a powder of the graft copolymer B-1.

B-2: Copolymerized latex 0 consisting of 89% of n-butyl acrylate unit and 11% of methacrylic acid unit in polybutadiene latex 20 (as a fixed component) having a solid content of 33% and an average particle size of 0.08 μm. 0.5 part (as solid content) was added with stirring, and stirring was continued for 30 minutes to obtain a bloated rubber latex having an average particle diameter of 0.20 μm.

The following monomer mixture was added thereto, and the mixture was thoroughly stirred and then N-lauroyl sarcosine sodium 0.5.
Part was dissolved, and the system was replaced with nitrogen to remove oxygen. N-Butyl acrylate 79.55 parts Allyl methacrylate 0.3 parts Ethylene glycol dimethacrylate 0.15 parts t-Butyl hydroperoxide 0.2 parts

The internal temperature was further raised to 45 ° C., and the following mixture was added. Rongalit 0.5 parts Ferrous sulfate heptahydrate 0.0003 parts Sodium ethylenediaminetetraacetate dihydrate 0.0009 parts Pure water 10 parts Then, hold for 90 minutes at an internal temperature of 75 ° C with stirring to form a composite rubber. A polymer latex was obtained.

Subsequently, the following composition was charged into a 20 liter reactor equipped with a stirrer. Composite rubbery polymer latex (as solid content) 45 parts N-lauroyl sarcosine sodium 1.2 parts Rongalit 0.4 parts Ferrous sulfate heptahydrate 0.001 part Ethylenediaminetetraacetic acid sodium dihydrate 0.003 Part Pure water 100 parts

Then, the temperature was raised to 75 ° C. with stirring, and the following monomer mixture was added dropwise over 120 minutes to carry out graft polymerization. Acrylonitrile 17 parts Styrene 38 parts t-Butyl hydroperoxide 0.3 parts n-octyl mercaptan 0.1 parts

After the monomer mixture was added dropwise, the mixture was held for 1 hour with stirring to obtain a graft copolymer latex. The graft copolymer latex was added to dilute sulfuric acid to coagulate, and then dehydrated, washed and dried to obtain a powder of the graft copolymer B-2.

B-3: 200 parts of pure water was put into a reactor equipped with a stirrer, and nitrogen substitution was sufficiently carried out while stirring, and then the internal temperature was raised to 80 ° C. 0.06 part of potassium persulfate was added, and the following mixture was continuously added dropwise over 30 minutes to obtain a crosslinked resin latex having an average particle diameter of 0.27 μm. Acrylonitrile 3.25 parts Styrene 9.75 parts Triallyl isocyanurate 0.06 parts Dioctyl sulfosuccinate 0.3 parts

Further, 0.24 part of potassium persulfate was additionally added, and the following mixture was continuously added dropwise at 80 ° C. for 2 hours to obtain an acrylic rubber latex having an average particle diameter of 0.30 μm. N-Butyl acrylate 42.3 parts Acrylonitrile 4.7 parts Triallyl isocyanurate 0.3 parts Dioctyl sulfosuccinate 0.3 parts

Subsequently, the following mixture was continuously added dropwise to this acrylic rubber latex at 80 ° C. for 2 hours. Acrylonitrile 10 parts Styrene 30 parts n-octyl mercaptan 0.04 parts Benzoyl peroxide 0.20 parts

The thus obtained graft polymer latex was poured into a 5-fold amount of calcium chloride aqueous solution to coagulate, dehydrated, washed and dried to obtain a powder of graft copolymer B-3.

(C) Copolymer

C-1: Acrylonitrile-styrene copolymer obtained by suspension polymerization (composition: acrylonitrile 2
5%, styrene 75%), intrinsic viscosity 0.48 (DMF
Medium, 25 ° C).

C-2: Acrylonitrile-styrene copolymer obtained by suspension polymerization method (composition: acrylonitrile 2
9%, styrene 71%), intrinsic viscosity 0.58 (DMF
Medium, 25 ° C).

(D) High molecular halogen compound Tetrabromobisphenol A, epichlorohydrin and tetrabromobisphenol A diglycidyl ether were used to synthesize lithium hydroxide as a catalyst, and n = 70 (halogenation rate 52) %) And n
= 90 (halogenation rate 52%).

(E) Low molecular weight halogen compound Tetrabromobisphenol A, epichlorohydrin and tetrabromobisphenol A diglycidyl ether were used to synthesize lithium hydroxide as a catalyst, and n = 1 (halogenation ratio 57 %) And n =
A compound of 6 (halogenation rate 57%).

(F) Antimony compound Antimony trioxide manufactured by Suzuhiro Chemical Co., Ltd.

Benzotriazole type ultraviolet absorber

G-1: 2- (3-tetrabutyl-2-hydroxy-5-methylphenyl) -5-chlorobenzotriazole (Adeka Stab LA-36, Asahi Denka Co., Ltd.)
Made).

G-2: 2,2-methylenebis [4-
(1,1,3,3-tetramethylbutyl) -6- (2H
-Benzotriazol-2-yl) phenol] (Adeka Stab LA-31, manufactured by Asahi Denka Co., Ltd.).

(H) Hindered amine amine light stabilizer

H-1: N-methyltetrakis (2,2,
6,6-Tetramethyl-4-3,9-bis (1,1-dimethyl-2-hydroxyethyl) -2,4,8,10-
Tetraoxaspiro [5,5] undecane) butane tetracarboxylate (Adeka Stab LA-63, manufactured by Asahi Denka Co., Ltd.).

H-2: N-methyltetrakis (1,2,
2,6,6-pentamethyl-4-piperidyl) 1,2,
3,4-butane tetracarboxylate (ADEKA STAB LA-52, manufactured by Asahi Denka Co., Ltd.).

H-3: Tetrakis (2,2,6,6-tetramethyl-4-piperidyl) 1,2,3,4-butane tetracarboxylate (Adeka Stab LA-57, manufactured by Asahi Denka Co., Ltd.).

[Examples 1 to 9 and Comparative Examples 1 to 11] The components (A) to (H) were mixed in the proportions shown in Tables 1 and 2 with a Henschel mixer, and a 35 mmφ twin screw extruder ( Extruded at a cylinder temperature of 250 ° C. with a TEM-35B manufactured by Toshiba Machine Co., Ltd. Examples 1 to 9 and Comparative Examples 1 to 1
A pellet of the resin composition of No. 1 was obtained. An injection molding machine (made by Meiki Seisakusho Co., Ltd., M
Cylinder temperature 240 ° C, mold temperature 60 at -100)
Various test pieces were molded at ℃ and the physical properties were evaluated. The results are shown in Tables 1 and 2.

[0086]

[Table 1]

[0087]

[Table 2]

[0088]

INDUSTRIAL APPLICABILITY The flame-retardant polycarbonate resin composition of the present invention is excellent in flame retardancy, heat resistance and weld strength, and is also extremely excellent in light resistance, moldability and impact resistance. It is extremely useful for applications such as equipment.

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location C08K 5/3475 KKK C08L 25/08 LEC 51/04 LLC 71/10 LQK (72) Inventor Takahiro Ikebe Otake, Hiroshima Prefecture 20-1 Miyuki-cho, Yokohama-shi Mitsubishi Rayon Co., Ltd. Otake Office

Claims (1)

[Claims] 1. A resin composition comprising the following components (A) to (H): 50 to 90 parts by weight of component (A), (B)
The total amount of the component (D) and the component (E) is 5 to 40 parts by weight (however, (D)
Component / (E) component ratio by weight is 2.0 to 0.25.
2 to 30 parts by weight of the component (F), 0.01 to 2.0 parts by weight of the component (G), and 0.01 of the component (H).
To 1.0 part by weight (however, the ratio of (G) component / (H) component is 0.5 to 20 by weight). And a flame-retardant polycarbonate resin composition having excellent impact resistance. (A) Polycarbonate resin. (B) For the first stage graft polymerization in the presence of 5 to 80 parts by weight of a rubbery polymer (a) having an average particle size of 0.25 to 0.50 μm, in which at least 50% by weight is composed of butadiene units As a monomer, 2 to 50 parts by weight of an acrylic acid ester monomer (b) is graft-polymerized, and then the second
Aromatic vinyl monomer (i) 10 to 85% by weight, vinyl cyanide monomer (ii) 5 to 40% by weight, and other copolymerizable with these as the monomer for graft polymerization after the second stage. Vinyl monomer (iii) 0 to 35% by weight (these (i) to (i
ii) It is obtained by graft-polymerizing 93 to 18 parts by weight of a vinyl monomer (c) consisting of 100% by weight of the components (the total amount of these components (a) to (c) is 100 parts by weight). Multi-stage graft copolymer. (C) A copolymer obtained by polymerizing 15 to 40% by weight of a vinyl cyanide monomer, 60 to 85% by weight of an aromatic vinyl monomer and 0 to 35% by weight of another vinyl monomer. (D) The halogenation rate represented by the following general formula (I) is 1
0% by weight or more of high molecular weight halogen compound. Embedded image (E) The halogenation rate represented by the following general formula (II) is 1
Low molecular weight halogen compounds of 0% by weight or more. Embedded image (F) Antimony compound. (G) A benzotriazole-based ultraviolet absorber which is a compound represented by the following general formula (III) or a condensate of the compound. Embedded image (H) A sterically hindered amine light stabilizer represented by the following general formula (IV). [Chemical 4]