JPS6323954A - Polycarbonate resin composition - Google Patents

Abstract

PURPOSE:To provide the title compsn. having excellent high-temperature stability, weather resistance, etc., consisting of a polycarbonate resin, a satd. polyester resin and/or a polyester elastomer, a specified siloxane graft copolymer and a vinyl polymer. CONSTITUTION:Not less than 70% (by weight; the same applies hereinbelow) siloxane graft copolymer obtd. by grafting 95-10% vinyl monomer onto 5-90% polyoganosiloxane rubber having an average particle size of 0.08-0.8mum and a degree of swelling of 3-30 (measured in toluene), composed of structural units of formulas I to III (wherein R<1> is methyl, ethyl, propyl or phenyl; R<2> is H or methyl; n is 0-2; and p is 1-6) originating from a grafting crosslinking agent, is mixed with not more than 30% vinyl polymer to obtain a mixture (C). A mixture of 1-99pts.wt. polycarbonate (A) and 99-1pt.wt. satd. polyester resin and/or polyester elastomer (B) is mixed with the component C in such a proportion that the polyorganosiloxane rubber component accounts for 0.5-60% of the total amount of the compsn.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a polycarbonate resin composition having excellent weather resistance, heat resistance stability and low temperature impact gamma resistance.

[Conventional technology]

Various methods have been proposed to improve the mechanical properties, thermal properties, etc. of aromatic polycarbonate resins and aromatic polyester resins. As an improvement, for example, Japanese Patent Publication No. 55-9435 proposes a resin composition comprising an aromatic polyester resin, an aromatic polycarbonate resin, and a butadiene-based graft copolymer. Although such resin compositions have been successful to some extent in improving impact resistance, they have the disadvantage of poor weather resistance due to the nature of the wood. Furthermore, JP-A-53-129246 discloses that a molded article with excellent weather resistance and impact resistance can be obtained by blending an acrylate copolymer with an aromatic polycarbonate resin and an aromatic polyester resin. However, it has the disadvantage of poor impact resistance at low temperatures.

[Problem that the invention seeks to solve]

As described above, various proposals have been made for modifying aromatic polycarbonate resins and polyester resins, but those with improved impact resistance reduce weather resistance, and those with good weather resistance have insufficient impact resistance. Therefore, balanced improvements in physical properties in general have not been achieved.

On the other hand, there are high expectations for organic materials in the automobile and electronic and electrical fields, and organic materials with more advanced functions and various different functions are required. Particularly in applications where metals have traditionally been used extensively, such as automobile exterior materials, there is a need for resins that satisfy impact resistance, weather resistance, heat resistance, etc. Currently, their use is limited for applications that require physical properties.

[Means for solving problems]

As a result of intensive studies to solve the above-mentioned problems, the present inventors found that a graft copolymer obtained by graft-polymerizing a vinyl monomer onto a polyorganosiloxane rubber, a polycarbonate resin, a saturated polyester resin, and/or a polyester elastomer. By blending with the
The present invention was completed based on the discovery that a thermoplastic resin composition with extremely excellent chemical resistance can be obtained.

That is, the polycarbonate resin composition of the present invention contains a polycarbonate resin (A), a saturated polyester resin and/or a polyester elastomer (B), and a degree of swelling measured in toluene of 3 to 30, which is derived from a graft cross-agent. having a structural unit and an average particle diameter of 0.
Polyorganosiloxane rubber 5 having a diameter of 08 to 0.8 μm
~90% by weight of at least one vinyl monomer95
1 to 99 parts by weight of component (A) and It is characterized in that component (C) is blended with 99 to II parts of component (B) in an amount such that the polyorganosiloxane rubber component accounts for 0.5 to 60% by weight of the total resin composition.

The polycarbonate resin (A) used in the present invention is produced using dihydroxydiarylalkane as a main raw material, and may optionally have a branched chain. Such polycarbonate resins are produced by known methods, and are generally produced by reacting dihydroxy and/or polyhydroxy compounds with phosgene or carbonic acid diesters. Suitable dihydroxydiarylalkane also include those having an alkyl group, a chlorine atom or a bromine atom ortho to the hydroxy group. Preferred specific examples of dihydroxydiarylalkane include 4,4'-dihydroxy-2,2-diphenylpropane (bisphenol A), tetramethylbisphenol A, bis-(4-hydroxyphenyl)-p
-diisopropylbenzene and the like. Further, branched polycarbonate resins are produced, for example, by substituting a part of the dihydroxy compound, for example 0.2 to 2 mol %, with a polyhydroxy compound. A specific example of the polyhydroxy compound is 1,4-bis-(4').

4.2'-dihydroxytriphenylmethyl)-benyne, phloroglucinol, 4,6-dimethyl-2゜4.
6-) Lee(4-hydroxyphenyl)-hebutene-
2,4,6-dimethyl-2,4,6-tri(4-hydroxyphenyl)-hebutane, 1,3,5-tri(4
-hydroxyphenyl)-benzene, 1゜1.1-tri(4-hydroxyphenyl)-ethane, 2,2-bis(4,4-(4,4'-dihydroxyphenyl)-cyclohexyltwopropane, etc.) .

The saturated polyester resin of component (B) used in the present invention is:
A resin obtained by condensation reaction using aromatic dicarboxylic acid or its ester-forming derivative and alkylene glycol as main components, for example, dicarboxylic acid such as terephthalic acid, inphthalic acid, naphthalene dicarboxylic acid, and ethylene glycol or propylene glycol. , tetramethylene glycol, hexamethylene glycol, and other glycols, and may be copolymerized with a small amount of other dicarboxylic acids or glycols if necessary. Preferred saturated polyester resins are polytetramethylene terephthalate, polyethylene terephthalate and mixtures thereof.

In addition, the polyester elastomer of component (B) used in the present invention has a high melting point polynisdel segment and molecules
It is a block copolymer consisting of a low melting point polymer segment of 00 to 20,000. Here, the high melting point polyester segment is a polyester obtained by subjecting an aromatic dicarboxylic acid and an alkylene glycol to a condensation reaction, and specific examples thereof are the same as in the case of the above-mentioned saturated polyester. - On the other hand, the low melting point polymer segment is a polyalkylene ether glycol, such as poly(ethylene oxide).
Glycols, poly(tetramethylene oxide) glycols, poly(propylene oxide) glycols and mixtures thereof and aliphatic polyesters, e.g.
Polyester obtained from ~12 aliphatic dicarboxylic acids and aliphatic glycols having 2 to 10 carbon atoms, more specifically polyethylene adipate, polytetramethylene adipate, polyethylene sebacate, polyneopentyl sebacate, polyhexamethylene aze ester, poly-6-caprolactone, and the like. The proportion of these low melting point polymer segments in the polyester elastomer is 2 to 2.
80% by weight is preferred.

The siloxane graft copolymer as component (C) used in the present invention is a graft copolymer consisting of 5 to 90% by weight of polyorganosiloxane rubber and 95 to 10% by weight of at least one vinyl monomer. The polyorganosiloxane rubber used in the present invention is obtained by polymerizing, preferably emulsion polymerizing, three components: an organosiloxane, a graft cross-linking agent, and a cross-linking agent. compounds containing siloxane units represented by a group (representing a group, a propyl group or a phenyl group), such as hexamethyltricyclosiloxane, octamethyltetracyclosiloxane, decamethylpentacyclosiloxane, dodecamethylhexacyclosiloxane, trimethylphenyltricyclosiloxane, Tetramethyltetraphenylcyclotetrasiloxane, octaphenylcyclotetrasiloxane, etc. are used, and the proportion thereof ranges from 60 to 99.8% by weight of the polyorganosiloxane rubber.

As the graft cross-agent, compounds of the general formulas (I), (II) and (III) CH2~c-coo4cH25iR1Q (, □17□
・・・・・・(I)H5+CToSiR,! IO+3
-n+ /2 ・= -(H)CH2=CH-5
iR110+3-n) /2 ・= −([
Il ) (wherein R1 represents a methyl group, ethyl group, propyl group or phenyl group, R2 represents a hydrogen atom or a methyl group, n represents 0, 1 or 2, and P represents an integer from 1 to 6. ) Compounds that form structural units represented by the general formula (
A (meth)acryloxysiloxane forming position 01 of the structure represented by I) is used. Since (meth)acryloxysiloxane has a high grafting efficiency, it can form effective graft chains and is advantageous in terms of developing #7 resistance. The amount of the graft cross-agent added is preferably 0.1 to 20% by weight. If it is less than 0.1% by weight, the graft polymerization will be insufficient and the homogeneous dispersibility of the graft copolymer in the composition will tend to be poor.On the other hand, if it exceeds 20% by weight, the graft ratio will increase, but the obtained This is not preferable since the degree of polymerization of the graft copolymer tends to decrease.

Further, as the crosslinking agent, trifunctional or tetrafunctional silane crosslinking agents such as trimethoxymethylsilane, triethoxyphenylsilane, methyl orthosilicate, ethyl orthosilicate, butyl orthosilicate, etc. are used. The amount of the crosslinking agent used is 0.1 to 40% by weight in the polyorganosiloxane rubber, and the swelling degree of the polyorganosiloxane rubber (when the polyorganosiloxane rubber is saturated at 25°C in a toluene solvent, the polyorganosiloxane rubber Weight ratio of absorbed toluene) is 3 to 30,
It is necessary to adjust it so that it is preferably in the range of 3 to 25. If the degree of swelling is less than 3, the amount of crosslinking agent becomes too large and rubber elasticity cannot be obtained.

If the degree of swelling exceeds 30, the domain structure cannot be maintained in the resin, impact resistance 7 cannot be imparted, and only the same effect as adding polydimethylsiloxane to the ridges can be obtained.

Note that a tetrafunctional silane crosslinking agent is preferable to a trifunctional silane crosslinking agent because it is easier to adjust the swelling degree within the above range.

The degree of swelling of polyorganosiloxane rubber is measured as follows. Polyorganosiloxane rubber latex is added to about 3 to 5 times the amount of isopropyl alcohol with stirring, and the emulsion is broken and coagulated to obtain polyorganosiloxane rubber. The rubber thus obtained is washed with water and then dried under reduced pressure at 80° C. for 10 hours.

After drying, approximately 1 g of rubber is accurately weighed, immersed in approximately 30 g of toluene, and left at 25° C. for 100 hours to swell the rubber with toluene. Next, the remaining toluene is separated and removed by decantation, weighed accurately, and then dried under reduced pressure at 80° C. for 16 hours, the absorbed toluene is removed by evaporation, and weighed accurately again. The swelling degree is calculated by the following formula.

The production of this polyorganosiloxane rubber latex is
For example, US Patent No. 2891920, US Patent No. 329472
The method described in Specification No. 5 etc. can be used.

For example, it is produced by shear mixing a mixed solution of an organosiloxane, a grafting agent, and a crosslinking agent with water in the presence of an emulsifier, for example, a sulfonic acid emulsifier such as alkylbenzene sulfonic acid or alkyl sulfonic acid, followed by polymerization. . Alkylbenzenesulfonic acid is suitable because it acts as an emulsifier for polyorganosiloxane and also serves as a polymerization initiator. At this time, it is preferable to use an alkylbenzenesulfonic acid metal salt, an alkylsulfonic acid metal salt, or the like in combination, since this is effective in maintaining the stability of the polymer during graft polymerization.

The rubber particle diameter of this polyorganosiloxane rubber texture has a significant influence on the impact resistance performance of the resin composition of the present invention, and is preferably in the range of 0.08 to 0.8. If it is outside this range, the impact resistance performance will deteriorate, which is not preferable.

Vinyl monomers to be graft-polymerized to this polyorganosiloxane rubber include styrene, α-methylstyrene, methyl methacrylate, 2-ethylhexyl methacrylate, ethyl acrylate, butyl acrylate,
Acrylonitrile, methacrylate trile, ethylene, propylene 1, butadiene, isoprene, chlorobrene,
One or more types of vinyl acetate, vinyl chloride, vinylidene chloride, allyl methacrylate, triallylisocyanurate, ethylene dimethacrylate, methacrylic ester, acrylic ester, conjugated diolefin, etc. are used.

The ratio of the vinyl monomer to the polyorganosiloxane rubber is 95 to 10% by weight of the vinyl monomer to 5 to 90% by weight of the polyorganosiloxane rubber. If the polyorganosiloxane rubber component is less than 5% by weight, the effect of improving the impact resistance of the resin composition of the present invention will not be sufficient, and if it is more than 90% by weight, the grafting effect will not be exhibited. Further, when using a mixture of the graft copolymer and a vinyl polymer, it is necessary to blend the vinyl polymer so that the polyorganosiloxane rubber component in the mixture is 5 to 90% by weight.

Such a siloxane-based graft copolymer can be obtained by radically polymerizing a vinyl monomer in a polyorganosiloxane rubber latex obtained by a conventional emulsion polymerization method in one or more steps.

Here, the graft ratio is preferably 10% or more.

In addition, among the vinyl monomers used for the graft chassis,
The ratio of vinyl monomers involved in grafting, that is, the grafting efficiency, is preferably as close to 100% as possible in order to exhibit impact resistance, and this efficiency varies greatly depending on the type of grafting cross-agent used. .

From this point of view, as a graft crossover agent, (I)
A polyorganosiloxane-based graft copolymer using (meth)acryloxysiloxane forming a structural unit represented by the formula is preferred.

Furthermore, when using a mixture of the above-mentioned siloxane-based graft copolymer and a vinyl-based polymer as component (C) in the composition of the present invention, the vinyl-based polymer may include an aromatic vinyl monomer, cyanide 70 to 100% by weight of one or more monomers selected from the group consisting of vinyl Q'4L and (meth)acrylic acid ester tp-mers, and 30% by weight of vinyl monomers copolymerizable therewith. Those obtained by polymerizing up to 0% by weight are used. For example, styrene,
A polymer or copolymer of one or more polymers selected from the group consisting of α-methylstyrene, methyl methacrylate, ethyl acrylate, methyl acrylate, butyl acrylate, acrylonitrile, methacrylate trile, and 30% by weight of these monomers. Ethylene in the following range,
Copolymers obtained by copolymerizing other vinyl monomers such as vinyl acetate may also be used. Two or more of these vinyl polymers may be used in combination.

The vinyl polymer is preferably produced by emulsion polymerization, which is easy to graft various monomers onto.

The blending ratio of each stiff component constituting the resin composition of the present invention is: polycarbonate resin (A) ~99 parts by weight, saturated polyester resin and/or polyester elastomer (B) 99 to 1 part by weight, A mixture of a siloxane-based graft copolymer or a siloxane-based graft copolymer and a vinyl-based polymer (C), and the organosiloxane rubber component is 0.5 to 0.5% of the total resin composition.
Blend in an amount of 60% by weight. If component (A) or component (B) is less than 1 part by weight, the effect of addition will not be apparent, and component (C) will not be added if the amount of polyorganosiloxane rubber component in component (C) is less than 1 part by weight of the total resin composition. Based on 0.
Even if it is blended in an amount less than 5% by weight, the modification effect of the present invention, especially the effect of improving impact resistance and chemical resistance, is not sufficient, and conversely, if it exceeds 60% by weight, molding processability decreases, which is not preferable.

The method for preparing the polycarbonate resin composition of the present invention is not particularly limited. For example, powders and granules are mixed using a Henschel mixer, tumbler, etc., and then mixed with a press, kneader, mixer, etc. It can be produced by various methods, such as melt-mixing in a vacuum cleaner, sequentially mixing other components into previously melted components, and directly molding the mixture using an injection molding machine.

In addition, the polycarbonate resin composition of the present invention includes a stabilizer against heat or light, such as a phenol-based stabilizer, a phosphite-based stabilizer, an ultraviolet absorber, an amine-based light stabilizer;
Modifiers for hydrolysis resistance, such as epoxy-based ones; known flame retardants; fillers such as glass fiber, titanium oxide, and talc; dyes and pigments; plasticizers, etc. can be added as necessary.

(Examples of the Invention) Hereinafter, the present invention will be explained in more detail with reference to Examples. In the following description, "r part" and "r%" each refer to "part by weight".
Means "% by weight".

Production Example 1 Production of polyorganosiloxane latex ■: 3 parts of ethyl orthosilicate, 1 part of γ-methacryloxypropyldimethoxymethylsilane and 96 parts of octamethyltetracyclosiloxane were mixed, and mixed siloxane 1
I got 00 copies. Add 100 parts of the above mixed siloxane to 300 parts of distilled water in which 1 part of dodecylbenzenesulfonic acid and 1 part of sodium dodecylbenzenesulfonic acid are dissolved,
After pre-stirring at 110,000 rpm using a homomixer, the mixture was passed through a homogenizer twice at a pressure of 300 kg/cm2 to emulsify and disperse it to obtain a polyorganosiloxane latex. This latex was transferred to a separable flask equipped with a condenser and a stirring blade, heated at 85°C for 4 hours while stirring and mixing, and then cooled at 5°C for 24 hours. Next, the pH of this latex was neutralized to 7.2 with an aqueous sodium hydroxide solution to complete the polymerization. The polymerization rate of the obtained polyorganosiloxane rubber was 91.2%, the solid content concentration was 22.74%, the degree of swelling was 7.4, and the rubber particle size of the polyorganosiloxane rubber was 0.15 scales. .

Production Example 2 Production of polyorganosiloxane latex H: 3 parts of ethyl orthosilicate, 2 parts of mercaptopropyldimethoxymethylsilane and 95 parts of octamethyltetracyclosiloxane were mixed to obtain 100 parts of mixed siloxane. The following emulsification, dispersion, and polymerization were performed in the same manner as in Production Example 1, and the mixture was neutralized to pH 6.8 with an aqueous sodium hydroxide solution. The polymerization rate of the obtained polyorganosiloxane rubber was 90
．． 8%, solid content concentration 22.64%, degree of swelling is 7.0, and the rubber particle size of the polyorganosiloxane rubber is 0.1.
It was 56 μm.

Production Example 3 Production of polyorganosiloxane latex ■: 3 parts of ethyl orthosilicate, 2 parts of tetravinyltetramethyltetracyclosiloxane and 95 parts of octamethyltetracyclosiloxane were mixed to produce a mixed siloxane of 100 parts.
I got the department. The following emulsion 1 dispersion and polymerization were carried out in the same manner as in Production Example 1, and the pH was adjusted to 7.0 using an aqueous sodium hydroxide solution.
was neutralized.

The polymerization rate of the obtained polyorganosiloxane rubber was 91.
6%, solid content concentration 22.84%, swelling degree is 7.3, and the rubber particle size of the polyorganosiloxane rubber is 0.15.
It was 2 scales.

Production Example 4 Siloxane-based graft copolymers S-1, S-2 and S
-3 Production: 263.9 parts of each of the polyorganosiloxane latexes ~■ obtained in Production Examples 1 to 3 (solid content concentration 22.74
%), 265.0 parts (solids concentration 22.64%), 26
2.7 parts (solid content concentration 22.84%) were placed in separate separable flasks equipped with a stirrer, and after purging with nitrogen,
℃, then 10 parts of acrylonitrile, 30 parts of styrene, and 0.0 parts of t-butyl hydroperoxide.
Eight parts were charged into each separable flask and stirred for 30 minutes. In addition, 0.12 parts of Rongalit, 0.1 parts of ferrous sulfate.
0002 parts, ethylenediaminetetraacetic acid disodium salt 0
．． An aqueous solution prepared by dissolving 0006 parts in 10 parts of water was added to start radical polymerization. Stirring and mixing were maintained for 1 hour, and after the exotherm of polymerization disappeared, the reaction temperature was maintained for 4 hours, and then the mixture was cooled to complete the polymerization. The polymerization rates of the obtained graft copolymers were 97%, 98.4% and 96.8%, the grafting rates were 48%, 21% and 18%, and the grafting efficiencies were 72%, 31.5% and 27%. Met. The obtained latex was dropped into hot water in which 5 parts of calcium chloride dihydrate had been dissolved to coagulate and separate the polymer, which was then dried to remove moisture and form a dry powder of siloxane graft copolymer S. -1, S-2 and S-3 were obtained.

Examples 1 to 3 and Comparative Examples 1 to 3 Bisphenol A type polycarbonate with a molecular weight of about 25,000, polytetramethylene terephthalate with an intrinsic viscosity [η] of 0.98, A S resin and polyester with an acrylonitrile/styrene weight ratio of 25,775. The organosiloxane graft copolymers S-1 and S-2 were subjected to fVffi in the proportions shown in Table 1, and then subjected to Henschel.

After mixing in a mixer for 4 minutes, the mixture was melt-kneaded in a 30 mmφ twin-screw extruder at a cylinder temperature of 260° C., and shaped into a pellet to obtain the composition of the present invention. Table 1 also shows the results of evaluating various physical properties using these pellets.

In Comparative Examples 1 and 2, instead of the polyorganosiloxane graft copolymer, B5-1 and butyl acrylate/styrene/trialyl isocyanate were added to a polymer obtained by graft polymerizing 10 parts of acrylonitrile and 30 parts of styrene to 60 parts of polybutadiene. Nurate weight ratio is 92/7
/l of 60 parts of acrylic rubber to 10 parts of acrylonitrile
ASA, an acrylic polymer made by polymerizing 30 parts of styrene.
It was manufactured in the same manner as in Example 1 except that -1 was used.

In the table below, the Izod impact strength is ASTM D25.
The thickness %''■■notched was measured using Sunshine Weather-Ometer 63℃, the color difference ΔE between the specimen and the unirradiated specimen after accelerated exposure for 1000 hours, and the heat resistance stability was measured at 150℃. The color difference ΔE between the specimen after heating for 48 hours in a gear oven and the unheated specimen was evaluated.The moldability was evaluated using a Meiki Seisakusho M'00 injection molding machine with a cylinder temperature of 260°C and a mold temperature of 60°C and an injection pressure of 50 kg. /cm' G, thickness
The length of flowing through a cavity of 1mm and width 10a+m is m.
It is measured in meters.

As is clear from Table 1, the molded product obtained from the composition of the present invention exhibits extremely good low-temperature impact resistance, and has better weather resistance than the composition of Comparative Example 1, which contains a butadiene rubber-based graft copolymer. Excellent, equivalent to or better than the weather resistance of the composition containing the acrylic rubber graft copolymer of Comparative Example 2,
Moreover, there is no problem with low temperature impact properties. In addition, it can be seen that the composition of the present invention has excellent molding processability compared to these materials, and is suitable for large-sized molded products.

Examples 4-7 and Comparative Examples 4-5 This example illustrates other outstanding features of the compositions of the present invention. A composition of the present invention was obtained in the same manner as in Example 1 by blending each component in the proportions shown in Table 2. This is 1712″ thick x 1
A specimen measuring /2" wide x 5" long was injection molded (cylinder temperature 260°C, whole mold temperature 60°C), and chemical resistance was evaluated using a cantilever test.

As a chemical, thinner for automobile urethane paint made by Nippon Paint was applied near the fulcrum, and a load of 150 g was applied to a portion 85 mm from the fulcrum, and the time (minutes) until breakage was measured. The results are also shown in Table 2.

In Table 1, polycarbonate, polytetramethylene terephthalate, and ASI resin were the same as in Examples 1 to 3, and S as the siloxane-based graft copolymer was used.
-1 and S-3 were used. In addition, polytetramethylene terephthalate-polytetramethylene oxide block copolymers containing 35% by weight of polytetramethylene oxide segments with a min': f-ffi of about 1200 and aromatic polyester-aliphatic polyester block copolymers are used as polyester elastomers. Combination (Pervuren S-200
0, trade name, manufactured by Toyobo Co., Ltd.) was used.

As is clear from Table 2, the composition of the present invention exhibits extremely good chemical resistance.

Examples 8 to 14 and Comparative Example 6 Polycarbonate with a molecular weight of about 22,000, intrinsic viscosity [η
] is 1.08 polytetramethylene terephthalate, intrinsic viscosity (η) is 0.72 polyethylene terephthalate, siloxane graft copolymer, AS resin used in Example 3 and methyl methacrylate with a styrene content of 42%. - Styrene copolymer (MS resin) was weighed in the proportions shown in Table 3, a composition of the present invention was produced in the same manner as in Example 1, and this was molded to obtain a specimen for evaluation.

In the table, the Izod impact strength is measured in the same manner as in Example 1, and the Rockwell hardness is ASTM D7.
85 on the R scale. The composition of the present invention has excellent properties in the range of high hardness and rigidity.

〔Effect of the invention〕

According to the present invention, a polycarbonate resin, a polyester polymer, and a siloxane graft copolymer are blended in the above-mentioned proportions, resulting in unprecedented impact resistance, abrasion resistance, heat resistance stability, as well as mulberry resistance and moldability. An excellent composition was provided. It has extremely beneficial effects when used under severe conditions such as automobile interior and exterior materials. Furthermore, heat resistance, rigidity, etc. can be further improved by blending a reinforcing filler such as glass fiber as necessary.

Claims (1)

[Claims] 1) polycarbonate resin (A), saturated polyester resin and/or polyester elastomer (B),
and 5 to 90% by weight of polyorganosiloxane rubber having a degree of swelling measured in toluene of 3 to 30, having a structural unit derived from a graft cross-agent, and having an average particle size of 0.08 to 0.8 μm. , consisting of a siloxane-based graft copolymer obtained by graft polymerization of 95 to 10% by weight of at least one vinyl monomer, or a mixture (C) of the siloxane-based graft copolymer and a vinyl-based polymer, Component (A) 1 to 99 parts by weight and component (B) 99 to 1 part by weight
1. A polycarbonate resin composition comprising component (C) in an amount such that the polyorganosiloxane rubber component accounts for 0.5 to 60% by weight of the total resin composition. 2) The above-mentioned polyorganosiloxane rubber has the following general formulas I to III as a structural unit derived from a grafting cross-agent. ...(II) ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(III) (In the formula, R^1 represents a methyl group, ethyl group, propyl group, or phenyl group, and R^2 represents a hydrogen atom or a methyl group. The composition according to claim 1, which has any one of the following structural units: n is 0, 1 or 2, and p is an integer from 1 to 6. 3) The composition according to claim 2, wherein the polyorganosiloxane rubber has a structural unit represented by the general formula I as a structural unit derived from a graft cross-agent.