JP2000143966A - Polycarbonate resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polycarbonate resin composition that has heat resistance, impact resistance in molded products of thick walls and good fluidity by admixing a powdery mixture containing a specific polytetrafluoroethylene to a polycarbonate resin. SOLUTION: (A) A polycarbonate resin is mixed with (B) a polytetrafluoroethylene-containing powder mixture comprising (i) polytetrafluoroethylene particles of particle sizes of <=10 μm and (ii) organic polymer powder. In a preferred embodiment, the component i has a particle size of 0.05-1 μm. The component i is prepared in the form of an aqueous dispersion by an emulsion polymerization of tetrafluoroethylene using a fluorine- containing surfactant. Styrene-acrylonitrile copolymer particles are preferably used as the component ii. The component B is admixed to the component A in an amount of 2-20 pts.wt. per 100 pts.wt. thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polycarbonate (hereinafter abbreviated as "PC") resin composition having a thick shape and excellent impact resistance.

[0002]

2. Description of the Related Art Since resin materials have poor impact resistance, many resin materials are required to have improved impact resistance.

[0003] For example, O
In the case of housing materials for home appliances such as A-devices, televisions, and audio devices, resin materials used for the housings are required to have higher impact resistance because of the complicated shape of the devices.

[0004] PC-based resin is a resin having excellent physical properties such as impact resistance and heat resistance of a thin molded article, and thus is widely used mainly for the above-mentioned applications. Tends to decrease. Particularly, the impact resistance of a low molecular weight PC resin having a weight average molecular weight of 22,000 or less, which is used when fluidity is required, is remarkably reduced.

[0005] As a method of expressing the impact resistance of a thick molded article of a low molecular weight PC resin, a method of adding a rubber-like substance is well known. Is reduced. When a PC resin having a weight average molecular weight of more than 2,3000 is used, there is a method of adding a St resin, an AS resin, an ABS resin, or the like in order to improve the fluidity. Decrease.

There is a strong demand for a PC-based fat composition having heat resistance, impact resistance in a thick molded product, and fluidity.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to obtain a PC-based fat composition having heat resistance, impact resistance in a thick molded product, and fluidity.

[0008]

The gist of the present invention is to provide a polytetrafluoroethylene-containing mixed powder comprising a PC resin (A) and polytetrafluoroethylene particles having a particle diameter of 10 μm or less and organic polymer particles ( PC consisting of B)
In the base resin composition.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION As the PC resin (A) according to the present invention, a resin produced by a generally known method is used. That is, a transesterification reaction between a diester of carbonic acid obtained from a monofunctional aromatic or aliphatic hydroxy compound and a dihydroxy compound, and a transesterification reaction between a dihydroxy compound and itself or another dihydroxy compound with a bisalkyl or bisallyl carbonate. And a reaction method between a dihydroxy compound and phosgene in the presence of an oxygen binder, and a reaction method between a dihydroxy compound and a bischlorocarbonate of the dihydroxy compound in the presence of an oxygen binder. Typically, there is a production method in which bisphenol A is reacted with carbonyl chloride in the presence of an oxygen binder and a solvent.

The polytetrafluoroethylene-containing mixed powder (B) according to the present invention comprises polytetrafluoroethylene particles having a particle diameter of 10 μm or less and organic polymer particles.

It is necessary that polytetrafluoroethylene has a particle diameter exceeding 10 μm and does not form an agglomerate, and is preferably a particle having a particle diameter of 0.05 to 1.0 μm. Such polytetrafluoroethylene particles are dispersed in water containing an emulsifier and the like, and the aqueous dispersion of polytetrafluoroethylene particles is obtained by emulsion polymerization using a fluorine-containing surfactant. Is obtained by polymerizing At the time of emulsion polymerization of polytetrafluoroethylene particles, as long as the properties of polytetrafluoroethylene are not impaired, hexafluoropropylene, chlorotrifluoroethylene, fluoroalkylethylene, perfluoroalkylvinylether and other fluorinated olefins as copolymerization components And fluorinated alkyl (meth) acrylates such as perfluoroalkyl (meth) acrylate. The content of the copolymer component is 10% with respect to tetrafluoroethylene.
It is preferable that the content be not more than weight%. Commercially available raw materials for the polytetrafluoroethylene particle dispersion include Fluon AD-1 and AD-936 manufactured by Asahi ICI Fluoropolymer Co., Ltd., and Polyflon D-1 and D-2 manufactured by Daikin Industries, Ltd., and DuPont Mitsui Fluorochemical Co., Ltd. Teflon 30J or the like can be given as a representative example.

The organic polymer particles are not particularly limited, and include PC, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, 6-nylon,
6-nylon, polyarylate, polyphenylene ether, modified polyphenylene ether, polyphenylene sulfide, polyetherketone, polyetheretherketone, polysulfone, polyethersulfone, polyamideimide, polyetherimide, polypropylene, polyethylene, polystyrene, high-impact polystyrene, carbon Polyalkyl (meth) acrylate having an alkyl group of 1 to 20, polyacetal, a copolymer composed of an aromatic vinyl monomer unit and a vinyl cyanide monomer unit, a phenol resin, a urea resin, and a melamine resin , Unsaturated polyester resin, alkyd resin, epoxy resin, silicon resin, polyurethane, ethylene-propylene copolymer, styrene-butadiene block copolymer,
Polybutadiene, polyisoprene, styrene-butadiene random copolymer and block copolymer, water additive of the block copolymer, acrylonitrile-butadiene copolymer, diene rubber such as butadiene-isoprene copolymer, ethylene- Propylene random copolymer and block copolymer, ethylene-butene random copolymer and block copolymer, copolymer of ethylene and α-olefin, ethylene-methacrylate, ethylene-butyl acrylate Copolymer with saturated carboxylate, acrylate-butadiene copolymer, for example, acrylic elastic polymer such as butyl acrylate-butadiene, copolymer with ethylene-vinyl acetate, ethylene-propylene-ethylidene norbornene copolymer Coalescing, Styrene - propylene - ethylene such as hexadiene copolymer - propylene nonconjugated diene terpolymer, butylene - isoprene copolymer, chlorinated polyethylene polyorganosiloxanes, polyalkyl (meth)
Rubbery polymers such as acrylates, composite rubbers containing polyorganosiloxanes and polyalkyl (meth) acrylates, graft copolymers of rubbery polymers with aromatic vinyl monomers and vinyl cyanide monomers grafted Rubber-based graft copolymer obtained by grafting a vinyl monomer onto a composite rubber containing polyorganosiloxane and polyalkyl (meth) acrylate, and a component copolymerizable therewith, 50% by weight based on the whole polymer One or more polymers may be included as described below, but those having an affinity for the PC-based resin from the viewpoint of dispersibility of polytetrafluoroethylene when blended with the PC-based resin. Preferably, particularly, a copolymer comprising an aromatic vinyl monomer unit and a vinyl cyanide monomer unit, Preparative copolymer.

The aromatic vinyl monomers include styrene, α-methylstyrene, vinyltoluene, monochlorostyrene, dichlorostyrene, monobromostyrene, dibromostyrene, p-tert-butylstyrene, ethylstyrene, vinylnaphthalene. And the like. One or more of them are used, but styrene and α-methylstyrene are preferred in view of cost.

Examples of the vinyl cyanide-based monomer include acrylonitrile, methacrylonitrile and the like, and one or more kinds are used. Further, as a copolymer component, methyl methacrylate, ethyl methacrylate, 2-ethylhexyl methacrylate, methacrylates such as glycidyl methacrylate, methyl acrylate, ethyl acrylate, acrylates such as butyl acrylate, N-phenylmaleimide, N-methylmaleimide and the like One or more vinyl monomers such as a maleimide compound and maleic anhydride are used in an amount of 50% by weight or less based on the entire polymerization components.

Preferred examples include a styrene-acrylonitrile copolymer (SAN resin) and a styrene-acrylonitrile-N-phenylmaleimide copolymer.

As a method for producing the organic polymer, generally known methods such as bulk polymerization, solution polymerization, suspension polymerization, and emulsion polymerization are used.

The method for obtaining the organic polymer as particles is not particularly limited. For example, a part of the monomer component used for polymerization of the ethylenically unsaturated monomer having an ionic group may be used. Alternatively, there can be mentioned a method used for all, a soap-free emulsion polymerization using an ionic polymerization initiator, an emulsion polymerization method using an ionic emulsifier, and the like.

Examples of the ethylenically unsaturated monomer having an ionic group include a monomer having a carboxyl group, a monomer having a sulfonic acid group, and a monomer having a phosphoric acid group as having an anionic group. Examples can be given. These anionic group-containing monomers can be used alone or in combination of two or more.

Examples of the carboxyl group-containing monomer include acrylic acid, methacrylic acid, fumaric acid, maleic acid,
Examples include itaconic acid, cinnamic acid, monoalkyl maleate, monoalkyl itaconate, and the like.

Examples of the sulfonic acid group-containing monomer include styrenesulfonic acid, acryloyloxyalkylsulfonic acid, methacryloyloxyalkylsulfonic acid, acrylamidoalkylsulfonic acid, and methacrylamidoalkylsulfonic acid.

As the phosphoric acid group-containing monomer, for example, 2-
Examples thereof include acryloyloxyethyl phosphoric acid, 2-methacryloyloxyethyl phosphoric acid, 2-acryloyloxyethoxyethyl phosphoric acid, and 2-methacryloyloxyethoxyethyl phosphoric acid.

By neutralizing a copolymer obtained from these anionic group-containing monomers with a suitable alkali, it is possible to impart a charge to the surface of particles made of the copolymer. In addition, you may copolymerize the monomer containing the salt of these anionic groups.

On the other hand, examples of the ethylenically unsaturated monomer containing a cationic group include primary amines, secondary amines,
Examples thereof include an ethylenically unsaturated monomer having a tertiary amine, a quaternary ammonium salt, or the like. These cationic group-containing monomers can be used alone or in combination of two or more.

By neutralizing the copolymer obtained from these cationic group-containing monomers with a suitable acid such as hydrochloric acid or acetic acid, electric charges are introduced to the surface of particles made of the copolymer. can do. In addition, you may copolymerize the monomer containing these salts of a cationic group.

Examples of the ionic polymerization initiator include persulfates (eg, potassium persulfate and ammonium persulfate), azobis (isobutyronitrile sulfonate), 4,4′-
Anionic polymerization initiators such as azobis (4-cyanovaleric acid), 2,2′-azobis (amidinopropane) dihydrochloride, 2,2′-azobis [2- (5-methyl-2-imidazoline-2-) Yl) propane] dihydrochloride, 2,2'-
Examples include cationic polymerization initiators such as azobis [2- (2-imidazolin-2-yl) propane] dihydrochloride and 2,2′-azobisisobutylamide dihydrate.

As the ionic emulsifier, any of anionic emulsifier, cationic emulsifier and amphoteric ionic emulsifier may be used. If desired, a nonionic emulsifier may be used in combination with these ionic emulsifiers.

Specific examples of the anionic emulsifier include fatty acid salts, higher alcohol sulfates, liquid fatty oil sulfates, sulfates of aliphatic amines and aliphatic amides, fatty alcohol phosphates, and dibasic fatty acids. Examples include ester sulfonates, fatty acid amide sulfonates, alkylallyl sulfonates, and formalin condensate naphthalene sulfonates.

Specific examples of the cationic emulsifier include aliphatic amine salts, quaternary ammonium salts, alkylpyridinium salts and the like.

Specific examples of the amphoteric emulsifier include alkyl betaine.

The polytetrafluoroethylene-containing composite powder according to the present invention can be obtained by stirring and mixing a polytetrafluoroethylene-based particle dispersion and an organic polymer particle dispersion.

In order to reduce the agglomeration rate during stirring and mixing, a nonionic emulsifier may be adsorbed on the surfaces of the polytetrafluoroethylene-based particles and / or the organic polymer particles before mixing.

The nonionic emulsifier is not particularly limited, and specific examples thereof include polyoxyethylene alkyl ether, polyoxyethylene alkyl allyl ether, dialkylphenoxypoly (ethyleneoxy) ethanol, polyvinyl alcohol, polyacrylic acid, and alkyl cellulose. be able to.

The morphology of the polytetrafluoroethylene-containing composite powder (B) according to the present invention may vary depending on the mixing ratio of both particles and the particle size. That is, the form in which the organic polymer surrounds the polytetrafluoroethylene-based particles, and the form in which the polytetrafluoroethylene-based particles surround the organic polymer, on the contrary,
There is a form in which several particles are aggregated with respect to one particle.

The polytetrafluoroethylene-containing composite powder (B) according to the present invention can be further subjected to graft polymerization of various vinyl monomers on its outer layer. The graft polymerization is performed in one step or in multiple steps by adding a monomer to the latex of the composite rubber and performing radical polymerization.

As the vinyl monomer to be graft-polymerized, styrene, p-methylstyrene, o-methylstyrene, p-chlorostyrene, o-chlorostyrene, p-chlorostyrene,
-Methoxystyrene, o-methoxystyrene, 2,4-
Aromatic vinyl monomers such as dimethylstyrene and α-methylstyrene; methyl acrylate, methyl methacrylate,
Ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, dodecyl acrylate, dodecyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, etc. )
Acrylic acid ester monomers; vinyl cyanide monomers such as acrylonitrile and methacrylonitrile; vinyl ether monomers such as vinyl methyl ether and vinyl ethyl ether; vinyl carboxylate monomers such as vinyl acetate and vinyl butyrate Olefin monomers such as ethylene, propylene and isobutylene; and diene monomers such as butadiene, isoprene, prene and dimethylbutadiene. One or more of these can be used.

For example, as the PC resin, styrene, α-methylstyrene, methyl methacrylate, cyclohexyl acrylate, and acrylonitrile are preferable in consideration of the flame retardancy of the obtained resin composition.

The polytetrafluoroethylene-containing mixed powder (B) according to the present invention is poured into hot water in which a metal salt such as calcium chloride or magnesium sulfate is dissolved, and salted out and solidified. This allows separation and recovery.

As an example of the method for producing the polytetrafluoroethylene-containing composite powder (B) according to the present invention, a composite rubber comprising the polyorganosiloxane and the polyalkyl (meth) acrylate described above as constituent components according to the present invention. A composite powder of a graft copolymer obtained by graft-polymerizing a vinyl monomer with polytetrafluoroethylene can also be produced. In this case, for example, polyorganosiloxane particles after polyorganosiloxane polymerization, composite rubber particles composed of polyorganosiloxane and polyalkyl (meth) acrylate after alkyl (meth) acrylate component polymerization, grafting after vinyl monomer graft polymerization The polytetrafluoroethylene composite powder is obtained by adding polytetrafluoroethylene particles to the organic polymer particles in any state of the copolymer particles and adding a stirring operation for a while if necessary. Obtainable.

The thermoplastic resin composition of the present invention can be obtained by mixing the PC resin (A) with the polytetrafluoroethylene-containing mixed powder (B).

The amount of the polytetrafluoroethylene-containing mixed powder (B) to be mixed with the PC resin (A) is not particularly limited, but as long as the properties of the PC resin (A) are not lost, the PC resin is used. Polytetrafluoroethylene-containing mixed powder (B) 1 per 100 parts by weight of resin (A)
Conventionally known methods such as a single-screw extruder, a twin-screw extruder, a batch-type kneader, and a roll kneader are used as the mixing method of ４０40 parts by weight, more preferably 2-20 parts by weight.

The resin composition containing the graft copolymer may further contain a dye, a pigment, a stabilizer, a reinforcing agent, a filler, and the like, if necessary.

The thermoplastic resin composition of the present invention can be used in fields requiring flame retardancy, impact resistance and cost reduction, such as housing materials for OA equipment and home electric appliances.

Hereinafter, the present invention will be described with reference to examples. In Reference Examples, Examples and Comparative Examples, "parts" and "%" are "parts by weight" and "% by weight" unless otherwise specified.
Means

[0044]

EXAMPLES Various physical properties in Examples and Comparative Examples were measured by the following methods.

(1) Solid content concentration: 170 ° C.
And dried for 30 minutes.

(2) Particle size distribution, weight average particle size: A solution obtained by diluting a particle dispersion with water was used as a sample solution, and a dynamic light scattering method (ELS800 manufactured by Otsuka Electronics Co., Ltd., temperature: 25 ° C., scattering angle: 90) Degree).

(3) Izod Impact Strength A test piece for a combustion test was cut to prepare an Izod impact strength test piece, which was measured according to ASTM D-256.

However, the measurement conditions were as follows: the test piece thickness was 6.4 mm (1
/ 2 "), temperature 23 ° C, humidity 50% RH.

(4) Heat distortion temperature (HDT) Heat resistance is 18.6 kg / c according to ASTM D-648.
It was measured in m ² .

(5) Fluidity Fluidity was measured using a 3 mm-thick spiral mold and an injection molding machine (IS-100 manufactured by Toshiba Machine Co., Ltd.) set at 290 ° C.

(Reference Example 1) Production of polytetrafluoroethylene (PTFE) / acrylonitrile-styrene polymer mixed powder (B-1): 196.9 parts of distilled water and 5 parts of sodium dodecylbenzenesulfonate were added to a cooling tube. And placed in a separable flask equipped with a stirrer and heated to 70 ° C. in a water bath under a nitrogen atmosphere, and then 0.0004 parts of ferrous sulfate, 0.0012 parts of disodium ethylenediaminetetraacetate, and 0. After adding a mixture of 8 parts and 3.1 parts of distilled water, a mixture of 29 parts of acrylonitrile, 71 parts of styrene and 0.058 part of cumene hydroperoxide was added dropwise over 3 hours, and then maintained for 1 hour. And an acrylonitrile-styrene polymer latex.

To this latex, 3 parts of a 60% aqueous dispersion of polytetrafluoroethylene (PTFE) (Teflon 30J manufactured by Mitsui DuPont Fluorochemicals) (solid content: 2
), And the mixture was kept for 1 hour to obtain a latex of polytetrafluoroethylene (PTFE) / acrylonitrile-styrene copolymer mixed powder (B-1). (B-
1) The number average particle diameter of the latex was 70 nm.

(B-1) The latex is coagulated by pouring into an aqueous solution of calcium chloride, washed with water, separated from solids, and dried at 80 ° C. for 24 hours.
Was obtained.

Reference Example 2 Production of polytetrafluoroethylene (PTFE) / composite rubber-based graft copolymer mixed powder (B-2): 100 parts of octamethylcyclotetrasiloxane, 2.0 parts of tetraethoxysilane, 200 parts of distilled water obtained by dissolving 0.67 parts of sodium dodecylbenzenesulfonate and 0.67 parts of dodecylbenzenesulfonic acid were added to a mixture of 0.5 parts of γ-methacryloyloxypropyldimethoxymethylsilane, and the mixture was mixed with a homomixer. After stirring at 10,000 rpm for 2 minutes, the mixture was passed through a homogenizer twice at a pressure of 200 kg / cm ² to obtain a stable premixed organosiloxane latex.

This latex was charged into a separable flask equipped with a cooling tube and a stirring blade, kept at 80 ° C. in a water bath for 6 hours, cooled, and then neutralized with an aqueous sodium hydroxide solution.

The latex S-1 thus obtained was dried at 170 ° C. for 30 minutes to determine the solid content.
9.2%. The number average particle diameter of the latex was 200 nm.

The obtained silicone latex (S-1)
33.9 parts, 273.3 parts of distilled water, 77.5 parts of n-butyl acrylate, 1.6 parts of allyl methacrylate and 0.3 part of tert-butyl hydroperoxide were separable with a condenser and a stirrer. The mixture was placed in a flask and heated to 65 ° C. in a water bath under a nitrogen atmosphere, and then 0.0001 part of ferrous sulfate, 0.0003 part of ethylenediaminetetraacetic acid disodium salt, 2.9 parts of Rongalite and 2.8 parts of distilled water. Part of the mixed solution to start radical polymerization,
Thereafter, the mixture was kept for 2 hours to obtain a composite rubber latex.

A mixture of 11 parts of methyl methacrylate and 0.055 part of tert-butyl hydroperoxide was added dropwise to the composite rubber latex in 15 minutes, and then maintained for 1 hour to complete the graft polymerization, to obtain polytetrafluoroethylene (PTFE). ) 60% aqueous dispersion (30 J, manufactured by Du Pont-Mitsui Fluorochemicals) (7 parts in terms of solid content) was added, followed by stirring for 1 hour, followed by stirring for polytetrafluoroethylene (P
A latex of (TFE) / graft copolymer (B-2) was obtained. (B-2) The number average particle diameter of the latex is 280 n
m.

(B-2) The latex is coagulated by pouring into an aqueous calcium chloride solution, washed with water, separated from solids, and dried at 80 ° C. for 24 hours.
Was obtained.

Polytetrafluoroethylene (PTFE)
Of mixed powder (B-3) containing: 50 parts of dodecyl methacrylate and 50 parts of methyl methacrylate
2'-azobis (2,4-dimethylvaleronitrile)
0.1 parts were dissolved. A mixture of 2.0 parts of sodium dodecylbenzenesulfonate and 300 parts of distilled water was added thereto, and the mixture was stirred at 10,000 rpm for 2 minutes with a homomixer, and then passed twice through a homogenizer at a pressure of 30 MPa to obtain a stable preliminary dispersion. I got This was charged into a separable flask equipped with a stirring blade, a condenser, a thermocouple, and a nitrogen inlet, the internal temperature was raised to 80 ° C. under a nitrogen stream, and the mixture was stirred for 3 hours to undergo radical polymerization. (Hereinafter referred to as B-3-1).

The solid content concentration of B-3-1 was 25.1%.
The particle size distribution shows a single peak, and the weight average particle size is 1
The surface potential was 91 nm and the surface potential was -58 mV.

As a polytetrafluoroethylene-based particle dispersion, Fluon AD93 manufactured by Asahi ICI Fluoropolymers Co., Ltd.
6 was used. AD936 has a solid content of 63.0% and contains 5% of polyoxyethylene alkylphenyl ether based on polytetrafluoroethylene. The particle size distribution of AD936 showed a single peak, the weight average particle size was 290 nm, and the surface potential was -20 mV.

Distilled water was added to 83.3 parts of AD936.
7 parts were added to obtain a polytetrafluoroethylene particle dispersion B-3-2 having a solid content concentration of 26.2%. B-3-2
Is 25% polytetrafluoroethylene particles and 1.2%
Of polyoxyethylene alkyl phenyl ether.

120 parts of B-3-2 (30 parts of polytetrafluoroethylene) and 199.2 parts of B-3-1 (50 parts of dodecyl methacrylate / methyl methacrylate copolymer) were mixed with a stirring blade, a condenser, a thermocouple, The mixture was charged into a separable flask equipped with a nitrogen inlet, and stirred at room temperature for 1 hour under a nitrogen stream. Then the temperature inside the system was raised to 80 ° C,
After holding for 1 hour, a mixed solution of 0.001 part of iron (II) sulfate, 0.003 part of disodium ethylenediaminetetraacetate, 0.24 part of Rongalit salt, and 60.8 parts of distilled water was added.
A mixed solution of 20 parts of methyl methacrylate and 0.4 part of tertiary butyl peroxide was added dropwise over 1 hour, and after completion of the addition, the internal temperature was maintained at 80 ° C. for 1 hour to complete radical polymerization. No solid matter was separated through a series of operations, and a uniform particle dispersion was obtained. This particle dispersion is poured into 400 parts of 90 ° C. hot water containing 5 parts of calcium chloride, the solid is separated, filtered and dried to obtain a mixed powder B-398.
Got a part.

(Examples 1 to 3) 90 parts of a polycarbonate resin (NOVAREX 7022A manufactured by Mitsubishi Engineering-Plastics Co., Ltd.) and the polytetrafluoroethylene organic polymer mixed powder B-1 obtained in Reference Example 1 B
-3 was mixed in 3 parts. Twin screw extruder (T, manufactured by Toshiba Machine Co., Ltd.)
Using EM35B), the mixture was melt-kneaded at a barrel temperature of 240 ° C. and a screw rotation speed of 200 rpm. A strand was cut using a pelletizer, and a UL94-V test piece and a UL94-5VB test piece were cut from the obtained pellet-shaped resin composition using an injection molding machine (IS-100 manufactured by Toshiba Machine Co., Ltd.). And Izod impact test pieces. Various measurements and tests were performed using the obtained test pieces. Table 1 shows the results. The obtained resin composition was excellent in impact resistance, heat resistance, and fluidity.

(Comparative Example 1) 100 parts of a polycarbonate resin (NOVAREX 7022A manufactured by Mitsubishi Engineering-Plastics Co., Ltd.) was used at a barrel temperature of 280 using a twin-screw extruder (TEM35B manufactured by Toshiba Machine Co., Ltd.).
The mixture was melt-kneaded at 200 ° C. and a screw rotation speed of 200 rpm. The strand was cut using a pelletizer, and an Izod impact test specimen and an HDT test specimen were molded from the obtained pellet-shaped resin composition using an injection molding machine (IS-100 manufactured by Toshiba Machine Co., Ltd.). The spiral flow length was also measured. Various measurements and tests were performed using the obtained test pieces. Table 1 shows the results. The obtained resin composition was inferior in impact resistance.

[0067]

[Table 1]

[0068]

According to the present invention, by using a polytetrafluoroethylene-containing mixed powder, P having heat resistance, impact resistance in a thick molded product, and fluidity can be obtained.
A C-based fat composition can be provided, and its utility value in fields such as housing materials for OA equipment and home electric appliances is enormous.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4J002 AC023 BB013 BB243 BC023 BD152 BG033 BN143 BP013 CB003 CC033 CC163 CC183 CD003 CF003 CG001 CG003 CH073 CH093 CK023 CL003 CM043 CN013 CN033 CP033 FD012 FD013 GQ00

Claims (1)

[Claims] 1. A polycarbonate resin composition comprising a polycarbonate resin (A) and a polytetrafluoroethylene-containing mixed powder (B) comprising polytetrafluoroethylene particles having a particle diameter of 10 μm or less and organic polymer particles. .