Polycarbonate resin composition and molded article

Abstract

To provide a polycarbonate resin composition excellent in thermal stability and molding appearance.SOLUTION: The polycarbonate resin composition contains, based on 100 pts.wt. of a resin component comprising (A) 45-65 pts.wt. of a polycarbonate resin (component A) and (B) 35-55 pts.wt. of a polyethylene terephthalate resin (component B), (C) 1.0-4.0 pts.wt. of a polyoxyalkylene bisphenol ether (component C) having a molecular weight of less than 1,300 as a plasticizer, (D) 0.03-0.1 pt.wt. of an organophosphate compound (component D) represented by general formula (1), and (E) 0-20 pts.wt. of an inorganic filler (component E) and does not contain an impact modifier.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a polycarbonate resin composition having excellent thermal stability and molded appearance, and to a molded article thereof. [Background technology]

[0002] Polycarbonate / polyethylene terephthalate alloys, which are alloys of polycarbonate resin and polyethylene terephthalate resin, are widely used in the automotive industry due to their excellent mechanical properties and chemical resistance. In recent years, automotive exterior parts have become increasingly integrated to reduce assembly steps, leading to active development of large parts. Therefore, there is a growing demand for resins with higher fluidity than conventional ones in order to obtain good molded appearances even for large parts. One method for improving fluidity has been investigated, which involves adding a polyalkylene glycol component as a plasticizer (see, for example, Patent Document 1). However, the effectiveness of improving molded appearance varies depending on the plasticizer component, and plasticizers generally have low molecular weights, which reduces the thermal stability of the resin composition. As a result, non-uniformity and unevenness occur, preventing satisfactory molded appearance. Furthermore, the plasticizer decomposes during high-temperature storage in the cylinder, resulting in a defective appearance known as silvering, due to the gas generated by the decomposition. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6889221 Summary of the Invention [Problem to be solved by the invention]

[0004] In view of the above, an object of the present invention is to provide a polycarbonate resin composition and molded article, particularly an automobile exterior part, which are excellent in thermal stability and molded appearance. [Means for solving the problem]

[0005] According to the present invention, the above problems are solved by the following configuration. 1. A polycarbonate resin composition characterized by containing, per 100 parts by weight of resin components consisting of 45 to 65 parts by weight of (A) polycarbonate resin (component A) and 35 to 55 parts by weight of (B) polyethylene terephthalate resin (component B), 1.0 to 4.0 parts by weight of (C) polyoxyalkylene bisphenol ether (component C) having a molecular weight of less than 1,300, 0.03 to 0.1 parts by weight of (D) an organic phosphate ester compound (component D) represented by the following general formula (1), and 0 to 20 parts by weight of (E) inorganic filler (component E), and not containing any impact modifier.

[0006] [ka]

[0007] [In formula (1), R represents an alkyl group having 2 to 25 carbon atoms which may have a substituent, and n represents 1 or 2. However, when n is 2, the two Rs may be different from each other.]

[0008] 2. The polycarbonate resin composition according to item 1 above, wherein component E is mica. 3. A molded article obtained by molding the polycarbonate resin composition according to the above item 1 or 2. 4. A molded product as described in the preceding paragraph 3 that is an automotive exterior part. [Effects of the Invention]

[0009] The polycarbonate resin composition of the present invention has excellent thermal stability and molded appearance, and is therefore useful in a wide range of applications including electrical and electronic applications, mechanical applications, office automation applications, automotive exterior parts, medical applications, and various other applications. In particular, it provides molded articles that are extremely useful as automotive exterior parts, and the industrial effects of the present invention are extremely significant. DETAILED DESCRIPTION OF THE INVENTION

[0010] The following further explains the details of the present invention.

[0011] <Component A: Polycarbonate resin> The polycarbonate resin used in the present invention is obtained by reacting a dihydric phenol with a carbonate precursor. Examples of the reaction method include interfacial polycondensation method, melt transesterification method, solid-phase transesterification method of carbonate prepolymer, and ring-opening polymerization method of cyclic carbonate compound, etc.

[0012] Representative examples of dihydric phenols used herein include hydroquinone, resorcinol, 4,4'-dihydroxydiphenyl, bis(4-hydroxyphenyl)methane, bis{(4-hydroxy-3,5-dimethyl)phenyl}methane, 1,1-bis(4-hydroxyphenyl)ethane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 2,2-bis(4-hydroxyphenyl)propane (commonly known as bisphenol A), 2,2-bis{(4-hydroxy-3-methyl)phenyl}propane, 2,2-bis{(4- 2,2-bis{(3-isopropyl-4-hydroxy)phenyl}propane, 2,2-bis{(4-hydroxy-3-phenyl)phenyl}propane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)-3-methylbutane, 2,2-bis(4-hydroxyphenyl)-3,3-dimethylbutane, 2,4-bis(4-hydroxyphenyl)-2-methylbutane, 2,2-bis(4-hydroxyphenyl)pentane, 2,2-bis(4-hydroxyphenyl)pentane, 1,1-bis(4-hydroxyphenyl)-4-methylpentane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-4-isopropylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 9,9-bis(4-hydroxyphenyl)fluorene, 9,9-bis{(4-hydroxy-3-methyl)phenyl}fluorene, α,α'-bis(4-hydroxyphenyl)-o-diisopropylbenzene, α,α'-bis(4-hydroxyphenyl)-m-diisopropylbenzene Examples of the dihydroxydiphenyl ether include 4,4'-isopropylbenzene, α,α'-bis(4-hydroxyphenyl)-p-diisopropylbenzene, 1,3-bis(4-hydroxyphenyl)-5,7-dimethyladamantane, 4,4'-dihydroxydiphenyl sulfone, 4,4'-dihydroxydiphenyl sulfoxide, 4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxydiphenyl ketone, 4,4'-dihydroxydiphenyl ether, and 4,4'-dihydroxydiphenyl ester, and these can be used alone or in combination of two or more.

[0013] Among these, homopolymers or copolymers obtained from at least one bisphenol selected from the group consisting of bisphenol A, 2,2-bis{(4-hydroxy-3-methyl)phenyl}propane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)-3-methylbutane, 2,2-bis(4-hydroxyphenyl)-3,3-dimethylbutane, 2,2-bis(4-hydroxyphenyl)-4-methylpentane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, and α,α'-bis(4-hydroxyphenyl)-m-diisopropylbenzene are preferred, and homopolymers of bisphenol A and copolymers of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane with bisphenol A, 2,2-bis{(4-hydroxy-3-methyl)phenyl}propane, or α,α'-bis(4-hydroxyphenyl)-m-diisopropylbenzene are particularly preferred.

[0014] Carbonyl halides, carbonate esters, haloformates, etc. are used as carbonate precursors, and specific examples include phosgene, diphenyl carbonate, and dihaloformates of dihydric phenols.

[0015] When producing a polycarbonate resin by reacting the dihydric phenol with a carbonate precursor by the interfacial polycondensation method or the melt transesterification method, a catalyst, a terminal terminator, an antioxidant for the dihydric phenol, etc. may be used as necessary. The polycarbonate resin may be a branched polycarbonate resin copolymerized with a trifunctional or higher polyfunctional aromatic compound, or a polyester carbonate resin copolymerized with an aromatic or aliphatic bifunctional carboxylic acid, or a mixture of two or more of the obtained polycarbonate resins.

[0016] Reaction methods such as the interfacial polymerization method, melt transesterification method, solid-phase transesterification method of carbonate prepolymer, and ring-opening polymerization method of cyclic carbonate compound, which are methods for producing the polycarbonate resin of the present invention, are well-known methods in various literatures and patent gazettes. Although the molecular weight of the polycarbonate resin is not specified, if the molecular weight is less than 1×10 ,

[0018] , ,

[0019] , , , -4 , SP , , SP ,

[0020] , , , , 0.83 , , 2 , the high-temperature characteristics and the like deteriorate, and if it exceeds 4×10 4 , the molding processability deteriorates. Therefore, those with a viscosity-average molecular weight represented by 1×10 4 to 4×10 4 are preferred, those with 1.4×10 4 to 3×10 4 are more preferred, and more preferably those with 1.6×10 4 to 2.5×10 4 .

[0017] Two or more polycarbonate resins may be mixed. In this case, it is of course possible to mix a polycarbonate resin whose viscosity-average molecular weight is outside the above range.

[0018] The viscosity-average molecular weight referred to in the present invention is obtained by inserting the specific viscosity (η SP ) obtained from a solution prepared by dissolving 0.7 g of polycarbonate resin in 100 ml of methylene chloride at 20°C into the following formula. η SP / c = [η] + 0.45×[η] 2 c (where [η] is the intrinsic viscosity) [η] = 1.23×10 -4 M 0.83 c = 0.7

[0019] The content of component A is 45 to 65 parts by weight, preferably 46 to 64 parts by weight, more preferably 48 to 63.5 parts by weight, and even more preferably 50 to 63 parts by weight in 100 parts by weight of the resin component composed of component A and component B. If the content of component A is less than 45 parts by weight, the thermal stability deteriorates, and if it exceeds 65 parts by weight, the molding appearance deteriorates.

[0020] <Component B: Polyethylene terephthalate resin> The polyethylene terephthalate resin used in the present invention is a polymer or copolymer obtained by a condensation reaction of aromatic dicarboxylic acid or its reactive derivative and diol or its ester derivative as the main components.

[0021] Terephthalic acid can be used as the aromatic dicarboxylic acid. In addition, a small amount of aliphatic dicarboxylic acids such as adipic acid, azelaic acid, sebacic acid, and dodecanedioic acid, and alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid can be used in combination with the aromatic dicarboxylic acid.

[0022] The diol component of the polyethylene terephthalate resin of the present invention is ethylene glycol. Furthermore, a small amount of one or more long-chain diols having a molecular weight of 400 to 6,000, such as polyethylene glycol, poly-1,3-propylene glycol, and polytetramethylene glycol, may be copolymerized.

[0023] The end group structure of the resulting polyethylene terephthalate resin is not particularly limited, and the proportion of hydroxyl groups and carboxyl groups in the end groups may be substantially equal, or one of them may be present in a larger proportion. Furthermore, the end groups may be blocked by, for example, reacting with a compound reactive with the end groups.

[0024] There are no limitations on the method for producing alkylene glycol esters of aromatic dicarboxylic acids and their oligomers. They are typically produced by thermally reacting an aromatic dicarboxylic acid or its ester-forming derivative with an alkylene glycol or its ester-forming derivative. For example, ethylene glycol esters of terephthalic acid and their oligomers, which are used as raw materials for polyethylene terephthalate resin, are produced by directly esterifying terephthalic acid with ethylene glycol, transesterifying a lower alkyl ester of terephthalic acid with ethylene glycol, or adding ethylene oxide to terephthalic acid. The alkylene glycol esters of aromatic dicarboxylic acids and their oligomers may contain other dicarboxylic acid esters copolymerizable therewith as additional components, in an amount that does not substantially impair the effects of the method of the present invention, specifically, in an amount of 10 mol % or less, preferably 5 mol % or less, based on the total molar amount of the acid components.

[0025] The copolymerizable additional component is preferably selected from esters or anhydrides of one or more of the following: an acid component, such as adipic acid, sebacic acid, 1,4-cyclohexanedicarboxylic acid, aliphatic and alicyclic dicarboxylic acids, and hydroxycarboxylic acids, such as β-hydroxyethoxybenzoic acid and p-oxybenzoic acid; and a glycol component, such as alkylene glycols having two or more carbon atoms, 1,4-cyclohexanedimethanol, neopentyl glycol, bisphenol A, bisphenol S, and aliphatic, alicyclic, and aromatic diol compounds and polyoxyalkylene glycols. The additional component esters may be used alone or in combination of two or more. However, the copolymerization amount is preferably within the above range.

[0026] In the polyethylene terephthalate resin used in the present invention, the catalyst may be added to the polymerization starting materials at any stage before the start of the polycondensation reaction of the aromatic dicarboxylic acid alkylene glycol ester and its oligomer, and the method of addition is not limited. For example, the aromatic dicarboxylic acid alkylene glycol ester may be prepared, and a solution or slurry of the catalyst may be added to the reaction system to start the polycondensation reaction. Alternatively, the catalyst solution or slurry may be added to the reaction system together with the starting materials when preparing the aromatic dicarboxylic acid alkylene glycol ester or after the starting materials are charged.

[0027] There are no particular limitations on the reaction conditions for producing the polyethylene terephthalate resin used in the present invention. In general, the polycondensation reaction is preferably carried out at a temperature of 230 to 320°C under normal pressure or reduced pressure (0.1 Pa to 0.1 MPa), or under a combination of these conditions, for 15 to 300 minutes.

[0028] In the polyethylene terephthalate resin used in the present invention, a reaction stabilizer, such as trimethyl phosphate, may be added at any stage in the production process, as needed. Furthermore, if necessary, one or more additives, such as antioxidants, ultraviolet absorbers, flame retardants, fluorescent brighteners, matting agents, tinting agents, antifoaming agents, and other additives, may be blended into the reaction system. It is particularly preferred that the polyethylene terephthalate resin contains at least one antioxidant containing a hindered phenol compound, and the content of this antioxidant is preferably 1 wt% or less based on the weight of the polyethylene terephthalate resin. If the content exceeds 1 wt%, thermal degradation of the antioxidant itself may occur, resulting in the disadvantage of deteriorating the quality of the resulting product.

[0029] The hindered phenolic antioxidant compounds used in the polyethylene terephthalate resin of the present invention are selected from pentaerythritol tetradecyl [3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and 3,9-bis{2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]-1,1-dimethylethyl}-2,4,8,10-tetraoxaspiro[5,5]undecane, and the like. It is also preferred to use these hindered phenolic antioxidants in combination with thioether-based secondary antioxidants. There are no particular restrictions on the method for adding the hindered phenolic antioxidants to the terephthalate resin, but they are preferably added at any stage between the end of the transesterification reaction or esterification reaction and the completion of the polymerization reaction.

[0030] The intrinsic viscosity of the polyethylene terephthalate resin is preferably 0.40 to 1.00. The intrinsic viscosity is more preferably in the range of 0.45 to 0.95, and even more preferably 0.50 to 0.90. If the intrinsic viscosity of the polyester resin is less than 0.40, sufficient impact properties and chemical resistance may not be obtained. If it is greater than 1.00, the fluidity during injection molding may decrease, resulting in poor molded appearance such as flow marks and poor coloring. The intrinsic viscosity of the polyethylene terephthalate resin is measured by dissolving it in orthochlorophenol at 35°C. Polyethylene terephthalate resins obtained by solid-state polycondensation are often used in general bottles, and therefore have an intrinsic viscosity of 0.70 to 0.90. It is preferable that the content of cyclic trimers of esters of aromatic dicarboxylic acids and alkylene glycols is 0.5 wt% or less and the content of acetaldehyde is 5 ppm or less. The cyclic trimers include alkylene terephthalates such as ethylene terephthalate, trimethylene terephthalate, tetramethylene terephthalate, and alkylene naphthalates such as ethylene naphthalate, trimethylene naphthalate, tetramethylene naphthalate, and hexamethylene naphthalate.

[0031] <Component C: Polyoxyalkylene bisphenol ether> The polyoxyalkylene bisphenol ether used as Component C of the present invention acts as a plasticizer. Specific examples of the polyoxyalkylene bisphenol ether include compounds obtained by adding ethylene oxide (EO) to bisphenol A such as polyethylene glycol bisphenol A ether and polyethylene glycol - polypropylene glycol bisphenol A ether. These compounds can be used alone or in combination of two or more. When using a compound other than polyoxyalkylene bisphenol ether as the plasticizer, the effect of improving the molding appearance is small, and furthermore, when trying to obtain a good molding appearance, it is necessary to add it excessively, resulting in deterioration of thermal stability.

[0032] As the polyoxyalkylene bisphenol ether of the present invention, those having a cyclic hydrocarbon group such as an aromatic hydrocarbon group or an alicyclic hydrocarbon group are preferred, and among them, the compound represented by the following general formula (2) is preferred from the viewpoint of the molding appearance.

[0033] [Chemical formula]

[0034] (In the formula, -A- is an alkylene group having 1 to 20 carbon atoms, and R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 are a hydrogen atom or a monovalent hydrocarbon group having 1 to 5 carbon atoms, and R 9 , R 10 are a divalent hydrocarbon group having 1 to 5 carbon atoms, and R 11 , R 12is a hydrogen atom or a monovalent hydrocarbon group having 1 to 20 carbon atoms, and they may be the same or different from each other. m and n represent the number of repeating units of oxyalkylene units and are natural numbers satisfying 2 ≦ m + n ≦ 18.

[0035] The molecular weight of Component C is less than 1300, preferably less than 1200, and more preferably less than 1100. When the molecular weight of Component C is 1300 or more, the effect of improving the molding appearance is small. The lower limit of the molecular weight of Component C is not particularly limited, but it is preferably 300 or more. The content of Component C is 1.0 to 4.0 parts by weight, preferably 1.5 to 3.5 parts by weight, and more preferably 1.9 to 3.3 parts by weight with respect to 100 parts by weight of the resin component composed of Component A and Component B. When the content of Component C is less than 1.0 part by weight, the molding appearance deteriorates, and when it exceeds 4.0 parts by weight, the thermal stability deteriorates.

[0036] <Component D: Organic phosphate ester compound> The organic phosphate ester compound used in the present invention is a compound represented by the general formula (1).

[0037] [Chemical formula]

[0038] [In formula (1), R represents an alkyl group which may have a substituent having 2 to 25 carbon atoms, and n represents 1 or 2. However, when n is 2, the two Rs may be different from each other.] When an organic phosphate ester compound other than the one represented by the above formula (1) is used as Component D, the effect of improving thermal stability is small.

[0039] Examples of the organic phosphate ester compound include AX-71 (trade name) manufactured by ADEKA, JP-518S, JP-504, JP-508, and JP-524R (trade names) manufactured by Johoku Chemical.

[0040] The content of component D is 0.03 to 0.10 parts by weight, preferably 0.04 to 0.09 parts by weight, more preferably 0.05 to 0.08 parts by weight, based on 100 parts by weight of the resin component composed of component A and component B. When the content of component D is less than 0.03 parts by weight, the thermal stability deteriorates, and when it exceeds 0.10 parts by weight, the molding appearance deteriorates.

[0041] <Component E: Inorganic filler> Examples of the inorganic filler used in the present invention include mica, wollastonite, talc, etc., and mica is preferably used. The average diameter of mica is preferably 10 to 30 μm, more preferably 13 to 25 μm, and even more preferably 15 to 20 μm. When the average diameter is less than 10 μm, the effect of improving the linear expansion coefficient and rigidity may be small, and when it exceeds 30 μm, the molding appearance may deteriorate or the decrease in impact resistance may be large.

[0042] [ Examples of mica include, for example, muscovite, fluorophlogopite, biotite, etc. Also, mica may be surface-treated with a coupling agent such as a silane-based coupling agent or a titanate-based coupling agent. Examples of the silane-based coupling agent include, for example, epoxy silane, amino silane, vinyl silane, etc. Examples of the titanate-based coupling agent include, for example, monoalkoxy type, chelate type, coordinate type, etc. The method of surface-treating mica with a coupling agent is not particularly limited and can be carried out by a normal method. For example, 0.1 to 10% by weight of the coupling agent can be added to mica and mixed at high speed while heating.

[0043] The content of component E is 0 to 20 parts by weight, preferably 5 to 19.5 parts by weight, and more preferably 8 to 19 parts by weight, based on 100 parts by weight of the resin component composed of component A and component B. When the content of component E exceeds 20 parts by weight, the molding appearance deteriorates.

[0044] The polycarbonate resin composition of the present invention may contain stabilizers such as phosphite and phenol, light stabilizers, flame retardants, lubricants, mold release agents, ultraviolet absorbers, antistatic agents, pigments, dyes, and the like.

[0045] The polycarbonate resin composition of the present invention does not contain an impact modifier. When an impact modifier is contained, the orientation of the inorganic filler is disturbed, and the molding appearance deteriorates.

[0046] The polycarbonate resin composition of the present invention can be produced by any method. For example, it is produced by mixing using a blender, super mixer, etc., or kneading using a single-screw or multi-screw extruder, etc. The mixing and kneading may be carried out by batch mixing of the polycarbonate resin, polyethylene terephthalate resin, polyoxyalkylene bisphenol ether, organic phosphate ester compound, and inorganic filler, or a part of the components may be mixed and kneaded first, and then mixed and kneaded with the remaining part.

[0047] The polycarbonate resin composition thus obtained is molded into automotive parts, electrical and electronic parts, etc. by various known methods, such as injection molding method, extrusion molding method, etc., and the molded product has excellent thermal stability and molding appearance.

Examples

[0048] Hereinafter, the reinforced resin composition of the present invention will be specifically described based on examples. "Parts" in the following measurement conditions and examples, etc. represent "parts by weight". 「Materials used」 <Component A: Polycarbonate resin> A: L-1225WX (trade name) (manufactured by Teijin Limited, average molecular weight 19700) <Component B: Polyethylene terephthalate resin> B: TRN-MTJ (manufactured by Teijin Limited, logarithmic viscosity 0.53) <Component C: Polyoxyalkylene bisphenol ether> C-1: Bisole 18EN (trade name) (manufactured by Toho Chemical Industry, average molecular weight 1010, polyalkylene bisphenol ether) C-2: BPE-20T (trade name) (manufactured by Sanyo Chemical Industries, average molecular weight 326, polyalkylene bisphenol ether) C-3 (comparative example): Bisole 30EN (trade name) (manufactured by Toho Chemical Industry, average molecular weight 1600, polyalkylene bisphenol ether) C-4 (comparative example): P-1010 (trade name) (manufactured by Kuraray, average molecular weight 1000, polyol adipate)

[0049] <Component D: Organic phosphate ester compound> D-1: AX-71 (trade name) (manufactured by ADEKA, the compound where R is C 18 H 37 in formula (1)) D-2 (comparative example): JC-224 (trade name) (manufactured by Johoku Chemical, ethyl diethylphosphonoacetate) <Component E: Inorganic filler> E: GM-6 (trade name) (manufactured by GreaMinerals, average diameter 17μm, mica)

[0050] <Other components> (UV absorber) LA-31 (trade name) (manufactured by ADEKA) (Release agent) EW-4C (trade name) (manufactured by Riken Vitamin) (Carbon masterbatch) ROYAL BLACK90003S (trade name) (manufactured by Kotani Kasei Kogyo) (Impact modifier) MB (butadiene rubber-containing methyl methacrylate graft copolymer): A graft copolymer with a volume average particle diameter of 180 nm obtained by emulsion graft polymerization of a mixed monomer obtained by adding butyl acrylate (BA) to methyl methacrylate (MMA) as a graft component to butadiene rubber polymerized only by emulsion polymerization using sodium dodecylbenzenesulfonate as an emulsifier

[0051] <Production of Resin Composition> (Examples 1 to 10 and Comparative Examples 1 to 11) The components shown in Table 1 were premixed in the proportions shown in Table 1, and each mixture was melt-kneaded at 270°C using a twin-screw extruder [TEX30α-31, manufactured by Japan Steel Works] to produce pellets.

[0052] <Evaluation method> The obtained pellets were dried in a hot air circulation dryer at 120°C for 5 hours or more, and then evaluated by the following evaluation method. The results are shown in Table 1. 1. Thermal stability evaluation Using an injection molding machine [ROBOSHOT α-S100iA manufactured by FANUC], plates (2 mm thick, 5 cm wide, 9 cm long) were molded by holding the mold at a cylinder temperature of 280°C and a mold temperature of 80°C for 10 minutes, and the appearance was observed with the naked eye and judged according to the following criteria. ○: The area where silver is occurring is 10cm 2 less than ×: The area where silver is generated is 10cm 2 End 2. Molding appearance evaluation Using an injection molding machine [EC130SX2-4Y manufactured by Toshiba Machine Engineering], square plates (150mm long x 150mm wide x 2.5mm thick) were molded under conditions of a cylinder temperature of 280°C, a mold temperature of 60°C, and an injection speed of 70mm / sec. The appearance of the plates was observed with the naked eye and rated according to the following criteria. ○: Virtually no unevenness or irregularities are observed on the surface. ×: The surface is significantly uneven and rough.

[0053] [Table 1]

[0054] As shown in Table 1, the resin composition of the present invention can provide a polycarbonate resin composition excellent in thermal stability and appearance outside the molded product. [Industrial Applicability]

[0055] The resin composition and molded article of the present invention can be used for housings for electrical, electronic and office automation equipment, interior panels, and automotive exterior parts such as roof spoilers, window garnishes and roof panels.

Claims

1. A polycarbonate resin composition characterized by containing, per 100 parts by weight of a resin component consisting of 45 to 65 parts by weight of (A) a polycarbonate resin (component A) and 35 to 55 parts by weight of (B) a polyethylene terephthalate resin (component B), 1.0 to 4.0 parts by weight of (C) a polyoxyalkylene bisphenol ether (component C) having a molecular weight of less than 1,300, 0.03 to 0.1 parts by weight of (D) an organic phosphate ester compound (component D) represented by the following general formula (1), and 0 to 20 parts by weight of (E) an inorganic filler (component E), and containing no impact modifier: 【Chemical 1】 [In formula (1), R represents an alkyl group having 2 to 25 carbon atoms which may have a substituent, and n represents 1 or 2. However, when n is 2, the two Rs may be different from each other.]

2. 2. The polycarbonate resin composition according to claim 1, wherein component E is mica.

3. A molded article obtained by molding the polycarbonate resin composition according to claim 1 or 2.

4. 4. The molded article according to claim 3, which is an exterior part for an automobile.

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