Polycarbonate resin composition

Abstract

A polycarbonate resin composition exhibiting excellent tensile elongation, notched tensile strength, flexural elasticity, and Charpy impact strength. [Solution] A total of 100 parts by mass of polycarbonate resin (A) 50 to 80 parts by mass and thermoplastic polyester resin (B) 20 to 50 parts by mass contains 5 to 20 parts by mass of wollastonite (C) and 0.1 to 1.5 parts by mass of acid-modified wax (D). Wollastonite (C) is a polycarbonate resin composition characterized by having a volume-average fiber diameter of 1.0 to 6.0 μm, a volume-average fiber length of 10.0 to 20.0 μm, an aspect ratio of 3 or more, and being surface-treated with an alkylsilane having 8 to 14 carbon atoms.

Description

Technical Field

[0001] The present invention relates to a polycarbonate resin composition, and more particularly to a polycarbonate resin composition excellent in tensile elongation, notched tensile strength, flexural elasticity, and Charpy impact strength.

Background Art

[0002] Conventionally, polycarbonate resins have been excellent in transparency, impact resistance, heat resistance, etc., and moreover, the obtained molded products are also excellent in dimensional stability, etc., so they are used in a wide range of fields such as electrical and electronic equipment parts, OA equipment parts, mechanical parts, vehicle parts, etc.

[0003] Furthermore, a polymer alloy composed of a polycarbonate resin and a thermoplastic polyester resin is a material in which the chemical resistance and molding processability, which are the disadvantages of aromatic polycarbonate resins, are improved while making use of the above excellent characteristics of polycarbonate resins, and is used in a wide range of fields such as vehicle interior and exterior parts, various housing members, and others. And, in order to improve the rigidity and dimensional stability of a polymer alloy composed of a polycarbonate resin and a thermoplastic polyester resin, it is often carried out to blend scaly or plate-like inorganic fillers such as talc and mica.

[0004] However, a resin composition composed of a polycarbonate resin and a thermoplastic aromatic polyester resin blended with scaly or plate-like inorganic fillers such as talc and mica has a drawback that the mechanical properties deteriorate because the reinforcing effect is small. A method of blending wollastonite, which is a needle-like inorganic filler, as an inorganic filler is also known. In Patent Document 1, it is proposed that by blending wollastonite having an aspect ratio L / D of 3 to 50 into a resin composition composed of a polycarbonate resin and a thermoplastic aromatic polyester resin, a sufficient reinforcing effect (particularly rigidity and impact resistance) and chemical resistance are improved.

[0005] However, polymer alloys of polycarbonate resin and thermoplastic polyester resin simply blended with wollastonite have the drawback of being prone to brittle fracture in tensile tests and having insufficient toughness. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2001-187839 [Overview of the project] [Problems that the invention aims to solve]

[0007] The object (problem) of the present invention is to provide a polycarbonate resin composition of polycarbonate resin and thermoplastic polyester resin that is excellent in tensile elongation, notched tensile strength, flexural elasticity, and Charpy impact strength. [Means for solving the problem]

[0008] As a result of diligent research to achieve the above objectives, the inventors of the present invention have discovered that a polymer alloy of polycarbonate resin and thermoplastic polyester resin containing wollastonite with a specific volume-average fiber diameter and volume-average fiber length, an aspect ratio of 3 or more, surface-treated with an alkylsilane of a specific number of carbon atoms, and an acid-modified wax in specific amounts, exhibits excellent tensile elongation, notched tensile strength, flexural elasticity, and Charpy impact strength, leading to the present invention. This invention relates to the following polycarbonate resin compositions.

[0009] 1. A total of 100 parts by mass of polycarbonate resin (A) 50 to 80 parts by mass and thermoplastic polyester resin (B) 20 to 50 parts by mass contains 5 to 20 parts by mass of wollastonite (C) and 0.1 to 1.5 parts by mass of acid-modified wax (D). Wollastonite (C) is a polycarbonate resin composition characterized by having a volume-average fiber diameter of 1.0 to 6.0 μm, a volume-average fiber length of 10.0 to 20.0 μm, an aspect ratio of 3 or more, and being surface-treated with an alkylsilane having 8 to 14 carbon atoms. 2. The polycarbonate resin composition according to item 1 above, wherein the tensile fracture strain measured in accordance with ISO 527 is 70% or more. 3. The notched Charpy impact strength measured according to ISO 179 was 13 kJ / m² at a thickness of 4 mm. 2 The polycarbonate resin composition according to 1 or 2 above. [Effects of the Invention]

[0010] The polycarbonate resin composition of the present invention exhibits excellent tensile elongation, notched tensile strength, flexural elasticity, and Charpy impact strength. By containing wollastonite(C) with a volume-average fiber diameter of 1.0 to 6.0 μm, a volume-average fiber length of 10.0 to 20.0 μm, and an aspect ratio of 3 or more, which is surface-treated with an alkylsilane having 8 to 14 carbon atoms, the fracture mode of the polycarbonate resin composition becomes ductile fracture, thereby enabling the expression of high toughness. In the case of wollastonite(C) that satisfies all of the above requirements, since the C8-C14 alkyl groups on the surface of wollastonite(C) are hydrophobic groups, interfacial delamination occurs between the hydrophobic groups and the polycarbonate resin. When voids are created due to the delamination of the interface between the polycarbonate resin and wollastonite(C), the polycarbonate resin can undergo plastic deformation without being constrained by wollastonite(C). This allows the molded polycarbonate resin composition to elongate under tension, resulting in a highly tough material exhibiting excellent tensile elongation. On the other hand, in the case of wollastonite that does not meet the above requirements, there is no void at the interface between the polycarbonate resin and the wollastonite during tension, so the polycarbonate resin does not elongate and brittle fracture occurs, resulting in inferior toughness. [Modes for carrying out the invention]

[0011] The present invention will be described in detail below with reference to embodiments and examples. In this specification, unless otherwise specified, "~" means that the numbers before and after it are included as the lower and upper limits.

[0012] The polycarbonate resin composition of the present invention contains 50 to 80 parts by mass of polycarbonate resin (A) and 20 to 50 parts by mass of thermoplastic polyester resin (B), totaling 100 parts by mass, with 5 to 20 parts by mass of wollastonite (C) and 0.1 to 1.5 parts by mass of acid-modified wax (D), wherein the wollastonite (C) has a volume-average fiber diameter of 1.0 to 6.0 μm, a volume-average fiber length of 10.0 to 20.0 μm, an aspect ratio of 3 or more, and is surface-treated with an alkylsilane having 8 to 14 carbon atoms.

[0013] [Polycarbonate resin (A)] The polycarbonate resin (A) used in the present invention is not particularly limited, and various types can be used. Polycarbonate resins can be classified into aromatic polycarbonate resins, in which the carbon atoms directly bonded to the carbonate bonds are aromatic carbon atoms, and aliphatic polycarbonate resins, in which the carbon atoms are aliphatic carbon atoms, and either can be used. Among these, aromatic polycarbonate resin is preferred as the polycarbonate resin (A) from the viewpoint of heat resistance, mechanical properties, electrical properties, etc.

[0014] Examples of aromatic dihydroxy compounds among the monomers used as raw materials for aromatic polycarbonate resins include: Dihydroxybenzenes such as 1,2-dihydroxybenzene, 1,3-dihydroxybenzene (i.e., resorcinol), and 1,4-dihydroxybenzene; Dihydroxybiphenyls such as 2,5-dihydroxybiphenyl, 2,2'-dihydroxybiphenyl, and 4,4'-dihydroxybiphenyl; Dihydroxynaphthalenes such as 2,2’-dihydroxy-1,1’-binaphthyl, 1,2-dihydroxynaphthalene, 1,3-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, 1,6-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, 1,7-dihydroxynaphthalene, 2,7-dihydroxynaphthalene;

[0015] Dihydroxy diaryl ethers such as 2,2’-dihydroxydiphenyl ether, 3,3’-dihydroxydiphenyl ether, 4,4’-dihydroxydiphenyl ether, 4,4’-dihydroxy-3,3’-dimethyl diphenyl ether, 1,4-bis(3-hydroxyphenoxy)benzene, 1,3-bis(4-hydroxyphenoxy)benzene;

[0016] 2,2-bis(4-hydroxyphenyl)propane (i.e., bisphenol A), 1,1-bis(4-hydroxyphenyl)propane, 2,2-bis(3-methyl-4-hydroxyphenyl)propane (i.e., bisphenol C), 2,2-bis(3-methoxy-4-hydroxyphenyl)propane, 2-(4-hydroxyphenyl)-2-(3-methoxy-4-hydroxyphenyl)propane, 1,1-bis(3-tert-butyl-4-hydroxyphenyl)propane, 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane, 2,2-bis(3-cyclohexyl-4-hydroxyphenyl)propane, 2-(4-hydroxyphenyl)-2-(3-cyclohexyl-4-hydroxyphenyl)propane, α,α’-bis(4-hydroxyphenyl)-1,4-diisopropylbenzene, 1,3-bis[2-(4-hydroxyphenyl)-2-propyl]benzene, bis(4-hydroxyphenyl)methane, bis(4-hydroxyphenyl)cyclohexylmethane, Bis(4-hydroxyphenyl)phenylmethane, Bis(4-hydroxyphenyl)(4-propenylphenyl)methane, Bis(4-hydroxyphenyl)diphenylmethane, Bis(4-hydroxyphenyl)naphthylmethane, 1,1-bis(4-hydroxyphenyl)ethane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 1,1-bis(4-hydroxyphenyl)-1-naphthylethane, 1,1-Bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)pentane, 1,1-Bis(4-hydroxyphenyl)hexane, 2,2-bis(4-hydroxyphenyl)hexane, 1,1-bis(4-hydroxyphenyl)octane, 2,2-bis(4-hydroxyphenyl)octane, 4,4-bis(4-hydroxyphenyl)heptane, 2,2-bis(4-hydroxyphenyl)nonane, 1,1-bis(4-hydroxyphenyl)decane, 1,1-Bis(4-hydroxyphenyl)dodecane, Bis(hydroxyaryl)alkanes such as;

[0017] 1,1-Bis(4-hydroxyphenyl)cyclopentane, 1,1-Bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3-dimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,4-dimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,5-dimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 1,1-Bis(4-hydroxy-3,5-dimethylphenyl)-3,3,5-trimethylcyclohexane, 1,1-Bis(4-hydroxyphenyl)-3-propyl-5-methylcyclohexane, 1,1-Bis(4-hydroxyphenyl)-3-tert-butyl-cyclohexane, 1,1-Bis(4-hydroxyphenyl)-4-tert-butyl-cyclohexane, 1,1-bis(4-hydroxyphenyl)-3-phenylcyclohexane, 1,1-Bis(4-hydroxyphenyl)-4-phenylcyclohexane, Bis(hydroxyaryl)cycloalkanes such as;

[0018] 9,9-Bis(4-hydroxyphenyl)fluorene, Bisphenols containing cardo structures, such as 9,9-bis(4-hydroxy-3-methylphenyl)fluorene;

[0019] 4,4'-Dihydroxydiphenyl sulfide, Dihydroxydiaryl sulfides such as 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide; Dihydroxydiaryl sulfoxides such as 4,4'-dihydroxydiphenyl sulfoxide and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide; 4,4'-Dihydroxydiphenylsulfone, Dihydroxydiarylsulfones such as 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfone; These are some examples.

[0020] Among these, bis(hydroxyaryl)alkanes are preferred, and among them, bis(4-hydroxyphenyl)alkanes are preferred, and in particular, 2,2-bis(4-hydroxyphenyl)propane and 2,2-bis(3-methyl-4-hydroxyphenyl)propane are preferred from the viewpoint of impact resistance and heat resistance. Furthermore, one aromatic dihydroxy compound may be used, or two or more may be used in any combination and ratio.

[0021] Among the monomers used as raw materials for polycarbonate resin, examples of carbonate precursors include carbonyl halides and carbonate esters. Note that one type of carbonate precursor may be used, or two or more types may be used in any combination and ratio.

[0022] Examples of carbonyl halides include, specifically, phosgene; bischloroformates of dihydroxy compounds; monochloroformates of dihydroxy compounds; and other haloformates.

[0023] Examples of carbonate esters include diaryl carbonates such as diphenyl carbonate and dityl carbonate; dialkyl carbonates such as dimethyl carbonate and diethyl carbonate; and carbonates of dihydroxy compounds such as biscarbonates, monocarbonates, and cyclic carbonates of dihydroxy compounds.

[0024] The method for producing the polycarbonate resin (A) is not particularly limited, and any method can be used. Examples include interfacial polymerization, molten transesterification, pyridine method, ring-opening polymerization of cyclic carbonate compounds, and solid-phase transesterification of prepolymers. Among these, interfacial polymerization and molten transesterification are preferred because they offer a greater improvement in moisture and heat resistance, with interfacial polymerization being particularly preferred.

[0025] The molecular weight of the polycarbonate resin (A) is preferably 10,000 to 50,000 in viscosity-average molecular weight (Mv), more preferably 10,000 to 40,000, among which 10,000 to 30,000 and 10,000 to 26,000, even more preferably 10,500 or more, 11,000 or more, particularly 11,500 or more, most preferably 12,000 or more, even more preferably 24,000 or less, and particularly preferably 20,000 or less. By setting the viscosity-average molecular weight to be above the lower limit of the above range, the mechanical strength of the polycarbonate resin composition of the present invention can be further improved, and by setting the viscosity-average molecular weight to be below the upper limit of the above range, the decrease in fluidity of the polycarbonate resin composition of the present invention can be suppressed and improved, thereby enhancing moldability and facilitating molding. Furthermore, two or more polycarbonate resins with different viscosity-average molecular weights may be mixed and used. In this case, polycarbonate resins whose viscosity-average molecular weight is outside the preferred range described above may also be mixed.

[0026] The viscosity-average molecular weight (Mv) is calculated by using methylene chloride as the solvent, determining the intrinsic viscosity [η] (unit: dl / g) at 25°C using an Ubbelohde viscometer, and then using Schnell's viscosity formula, i.e., η = 1.23 × 10⁻⁶. -4 Mv 0.83 It refers to the value calculated from [the formula]. In addition, intrinsic viscosity [η] is the specific viscosity [η] at each solution concentration [C] (g / dl). sp This value was calculated by measuring [the value] and using the following formula.

number

[0027] Furthermore, the polycarbonate resin (A) may be not only virgin resin, but also polycarbonate resin recycled from used products (so-called material-recycled polycarbonate resin), or polycarbonate resin manufactured from polycarbonate resin that has been chemically decomposed back into raw materials (so-called chemical-recycled polycarbonate resin). It is also preferable to contain both virgin resin and recycled resin, and may consist solely of recycled polycarbonate resin. The proportion of recycled polycarbonate resin in polycarbonate resin (A) is preferably 40% or more, 50% or more, 60% or more, or 80% or more, and particularly preferably 100%.

[0028] Preferred used products include various sheet materials, optical recording media such as optical discs (CDs, DVDs), light guide plates, transparent vehicle components such as car windows, car headlamp lenses, and windshields, containers such as water bottles, various cover materials, eyeglass lenses, and building components such as soundproof walls, glass windows, and corrugated sheets. In addition, recycled polycarbonate resin can be made from crushed materials obtained from defective products during molding, sprues, or runners, or pelletized materials obtained by melting these materials.

[0029] [Thermoplastic polyester resin (B)] The thermoplastic polyester resin (B) used in the polycarbonate resin composition of the present invention is a polymer or copolymer obtained by a condensation reaction mainly consisting of a dicarboxylic acid component consisting of dicarboxylic acids or their reactive derivatives and a diol component consisting of diols or their ester derivatives. Preferably, an aromatic dicarboxylic acid is used as the main acid component, and a thermoplastic polyester resin obtained by polycondensation reaction of this with an alcohol mainly consisting of an aliphatic diol is used.

[0030] Examples of aromatic dicarboxylic acids include terephthalic acid, isophthalic acid, orthophthalic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 4,4'-biphenyldicarboxylic acid, 4,4'-biphenyletherdicarboxylic acid, 4,4'-biphenylmethanedicarboxylic acid, 4,4'-biphenylsulfondicarboxylic acid, 4,4'-biphenylisopropylidenedicarboxylic acid, 1,2-bis(phenoxy)ethane-4,4'-dicarboxylic acid, 2,5-anthracenedicarboxylic acid, 2,6-anthracenedicarboxylic acid, 4,4'-p-ta-phenylenedicarboxylic acid, and 2,5-pyridinedicarboxylic acid. Substitutes of these (e.g., alkyl-substituted compounds such as 5-methylisophthalic acid) and reactive derivatives (e.g., alkyl ester derivatives such as dimethyl terephthalate and diethyl terephthalate) can also be used.

[0031] Of these, terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid and their alkyl ester derivatives are more preferred, and terephthalic acid, isophthalic acid, and their alkyl ester derivatives are particularly preferred. These aromatic dicarboxylic acids may be used individually or in combination of two or more, and it is also possible to use one or more aliphatic dicarboxylic acids such as adipic acid, azelaic acid, sebacic acid, and dodecanedioic acid, or alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid in combination with the aromatic dicarboxylic acid.

[0032] Examples of diols include aliphatic diols such as ethylene glycol, diethylene glycol, 1,2-propylene glycol, 1,3-propanediol, triethylene glycol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, decamethylene glycol, and 2,2-dimethyl-1,3-propanediol; alicyclic diols such as 1,4-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, cyclohexanediol, and trans- or cis-2,2,4,4-tetramethyl-1,3-cyclobutanediol; and aromatic diols such as p-xylenediol, bisphenol A, tetrabromobisphenol A, and tetrabromobisphenol A-bis(2-hydroxyethyl ether). Substitutes of these diols can also be used.

[0033] Of these, aliphatic diols are preferred in terms of heat resistance and dimensional stability, ethylene glycol, 1,4-butanediol, and 1,4-cyclohexanedimethanol are more preferred, and ethylene glycol is particularly preferred.

[0034] Diols may be used alone or in combination of two or more. Furthermore, one or more long-chain diols with molecular weights of 400 to 6,000, such as polyethylene glycol, poly-1,3-propylene glycol, and polytetramethylene glycol, may be copolymerized in combination with the above-mentioned diols.

[0035] Furthermore, thermoplastic polyester resin (B) can be copolymerized with hydroxycarboxylic acids such as parahydroxybenzoic acid, other carboxylic acids, and alcohols other than the diols mentioned above, and such copolymerized resins can also be used in the present invention. However, it is preferable that such copolymerized components be present in small amounts, and it is preferable that 80% by mass or more, and more preferably 90% by mass or more, of the thermoplastic polyester resin (B) consists of components from aromatic dicarboxylic acids and aliphatic diols. It is also preferable that one type of compound accounts for 80 mol% or more, and more preferably 90 mol% or more, of each aromatic dicarboxylic acid and aliphatic diol.

[0036] Preferred examples of such thermoplastic polyester resins (B) include polybutylene terephthalate, polybutylene naphthalate, polycyclohexanedimethanol terephthalate, polyethylene terephthalate, and polyethylene naphthalate. These may contain copolymer components such as polybutylene terephthalate / isophthalate and polyethylene terephthalate / isophthalate. In the present invention, among these, polybutylene terephthalate (PBT), polybutylene terephthalate / isophthalate (PBT / I), polyethylene terephthalate (PET), and polyethylene terephthalate / isophthalate (PET / I) are preferred, and it is also preferable to use a combination of these. When using a combination, the ratio of PET (as the amount containing PET / I):PBT (as the amount containing PBT / I) = 8:1 to 1:8 (by mass ratio) is preferred.

[0037] Germanium compounds, antimony compounds, tin compounds, and titanium compounds are known polymerization catalysts for the production of polyethylene terephthalate, but in the present invention, it is preferable to use a polymerized product using a germanium compound as a catalyst. When polymerized products using other catalysts are used, the thermal stability and recyclability of the final composition with aromatic polycarbonate resin tend to decrease. Examples of germanium compounds to be used as catalysts include germanium oxides such as germanium dioxide, germanium alkoxides such as germanium tetraethoxide and germanium tetraisopropoxide, germanium hydroxide and its alkali metal salts, germanium glycolate, germanium chloride, and germanium acetate. These may be used individually or in combination of two or more. Among these, the use of germanium dioxide is preferred in terms of solvent resistance and thermal stability of the resulting polyethylene terephthalate.

[0038] It is preferable to use a germanium catalyst in such a concentration of germanium atoms in the resulting polyethylene terephthalate that it reaches 15 ppm to 40 ppm. Below 15 ppm, the polymerization reaction proceeds slowly, and above 40 ppm, side reactions may occur due to germanium compounds remaining in the resin.

[0039] As for polybutylene terephthalate, it is preferable to use a polymerized product using a titanium compound as the main catalyst and a Group 1 or Group 2 metal compound as a co-catalyst. Examples of titanium compounds include inorganic titanium compounds such as titanium oxide and titanium tetrachloride; titanium alcoholates such as tetramethyl titanate, tetraisopropyl titanate, and tetrabutyl titanate; and titanium phenolates such as tetraphenyl titanate. Among these, the use of titanium alcoholates is preferred. The most preferred are tetraalkyl titanates, particularly tetrabutyl titanate.

[0040] It is preferable to use the titanium compound in the resulting polybutylene terephthalate at a concentration of 20 ppm to 50 ppm, particularly 30 to 40 ppm, in terms of titanium atoms. If too much titanium compound is used, the color and hydrolysis resistance of the resulting polybutylene terephthalate may decrease, and solution haze and an increase in impurities may occur due to deactivation of the titanium catalyst. Conversely, if too little is used, the polymerization properties of the polybutylene terephthalate tend to decrease.

[0041] The thermoplastic polyester resin (B) preferably has an intrinsic viscosity (IV) of 0.4 to 2.0 dl / g, measured at 30°C in a mixed solvent of phenol and tetrachloroethane (mass ratio = 50 / 50). If an intrinsic viscosity of less than 0.4 dl / g is used, the mechanical strength of the resin composition will be inferior, while if it exceeds 2.0 dl / g, the moldability tends to decrease. A more preferred intrinsic viscosity (IV) for thermoplastic polyester resin (B) is 0.6 to 1.8 dl / g, and even more preferably 0.6 to 1.6 dl / g.

[0042] Furthermore, the thermoplastic polyester resin (B) can be made from not only virgin products but also recycled materials, such as those made from used products, or material recycled materials. It can also be made from recycled materials, such as defective products, sprues, and runners, produced during molding. It is preferable to use such recycled materials for the thermoplastic polyester resin (B).

[0043] The content of polycarbonate resin (A) and thermoplastic polyester resin (B) is such that, based on a total of 100 parts by mass of polycarbonate resin (A) and thermoplastic polyester resin (B), polycarbonate resin (A) is 50 to 80 parts by mass and thermoplastic polyester resin (B) is 20 to 50 parts by mass. If the content of thermoplastic polyester resin (B) is less than 20 parts by mass, the effect of improving the chemical resistance and fluidity of polycarbonate resin (A) is not sufficiently obtained, and if it exceeds 50 parts by mass, the heat resistance, heat retention stability, and dimensional stability of polycarbonate resin (A) deteriorate. The content of thermoplastic polyester resin (B) is preferably less than 50 parts by mass, more preferably 45 parts by mass or less, and particularly preferably 40 parts by mass or less. Furthermore, it is preferably 15 parts by mass or more, even more preferably 20 parts by mass or more, and particularly preferably 25 parts by mass or more.

[0044] [Wallastonite (C)] The polycarbonate resin composition of the present invention contains wollastonite (C) surface-treated with an alkylsilane having 8 to 14 carbon atoms, having a volume-average fiber diameter of 1.0 to 6.0 μm, a volume-average fiber length of 10.0 to 20.0 μm, and an aspect ratio of 3 or more.

[0045] Wollastonite, represented as CaO·SiO2, is a naturally occurring white, acicular crystalline mineral, and may also be synthesized.

[0046] The initial volume-average fiber diameter of wollastonite (C) is 1.0 to 6.0 μm, preferably 1.5 μm or more, more preferably 2.0 μm or more, even more preferably 2.5 μm or more, particularly preferably 3.0 μm or more, preferably 5.5 μm or less, more preferably 5.0 μm or less, even more preferably 4.7 μm or less, and particularly preferably 4.5 μm or less. If the volume-average fiber diameter is less than 1.0 μm, it is prone to breakage during processing. If the volume-average fiber diameter exceeds 6.0 μm, the surface area of ​​a single wollastonite particle increases, and when interfacial delamination occurs due to external stress, a large delamination area is formed, making it prone to breakage, resulting in reduced elongation and a smaller toughness improvement effect.

[0047] Furthermore, the initial average aspect ratio of wollastonite (C) (the value obtained by dividing the initial volume-average fiber length by the initial volume-average fiber diameter) is 3 or greater, preferably 3.1 or greater, more preferably 3.2 or greater, preferably 6.0 or less, more preferably 5.0 or less, even more preferably 4.5 or less, most preferably 4.0 or less, and especially preferably 3.8 or less. If the initial average aspect ratio falls below 3, the reinforcing effect tends to be reduced.

[0048] In this invention, the volume-average fiber diameter and volume-average fiber length of wollastonite(C) can be measured, for example, by using the particle shape image analysis device "PITA-04" manufactured by Seishin Corporation to photograph wollastonite(C) particles and processing the obtained images. The measurement is considered to end when the cumulative number of wollastonite(C) particles from the start of measurement reaches 10,000, and each measurement value is the volume-average fiber diameter D of 10,000 wollastonite(C) particles. 50 and volume-average fiber length D 50 That is the case. The average aspect ratio is calculated by dividing the volume-average fiber length obtained above by the volume-average fiber diameter.

[0049] Wollastonite (C) is wollastonite surface-treated with an alkylsilane having 8 to 14 carbon atoms. Various surface treatment agents are available, but in this invention, an alkylsilane having 8 to 14 carbon atoms is used. When a polycarbonate resin composition contains wollastonite (C) with a volume-average fiber diameter of 1.0 to 6.0 μm, a volume-average fiber length of 10.0 to 20.0 μm, and an aspect ratio of 3 or more, and is surface-treated with an alkylsilane having 8 to 14 carbon atoms, the polycarbonate resin composition undergoes ductile fracture, thereby exhibiting high toughness and excellent tensile elongation, notched tensile strength, and flexural modulus. Surface treatment with alkylsilanes having 7 or fewer carbon atoms results in poor tensile elongation and a tendency towards brittle fracture, while surface treatment with alkylsilanes having 15 or more carbon atoms results in poor tensile elongation and a tendency towards reduced notched tensile strength.

[0050] C8-C14 alkylsilanes are silane compounds having an alkyl group having C8-C14, where the alkyl group may be linear or branched. Examples of silane compounds having an alkyl group having C8-C14 include alkyltriethoxysilane and alkyltrimethoxysilane. Examples of C8-C14 alkyl groups include octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, and tetradecyl groups. C8-C10 alkyl groups are more preferred, with octyl, nonyl, and decyl groups being preferred. Preferred alkylsilanes include octyltriethoxysilane, octyltrimethoxysilane, nonyltriethoxysilane, nonyltrimethoxysilane, decyltriethoxysilane, and decyltrimethoxysilane.

[0051] The amount of surface treatment with alkylsilane is preferably 0.1 to 10% by mass relative to wollastonite (C), more preferably 0.2% by mass or more, and more preferably 0.3% by mass or more, 0.4% by mass or more, and 0.5% by mass or more, and more preferably 7% by mass or less, and more preferably 5% by mass or less, 4% by mass or less, 3% by mass or less, 2% by mass or less, and 3% by mass or less.

[0052] The wollastonite (C) content in the polycarbonate resin composition is 5 to 20 parts by mass per 100 parts by mass of the total of the polycarbonate resin (A) and thermoplastic polyester resin (B). If the amount of wollastonite (C) is less than 5 parts by mass, the effect of improving mechanical strength is small, and if it exceeds 20 parts by mass, the surface smoothness of the molded product decreases, and the fluidity and appearance deteriorate, which is undesirable. The wollastonite (C) content is preferably 8 parts by mass or more, and preferably 15 parts by mass or less.

[0053] [Acid-modified wax (D)] The acid-modified wax (D) is an acid-modified saturated hydrocarbon wax which preferably has a carboxyl group and / or its acid anhydride group, and more preferably an olefin polymer wax containing a COOH group and / or an acid anhydride, and is preferably a structure in which α-olefin and an unsaturated carboxylic acid or its anhydride are randomly copolymerized, or a structure in which an unsaturated carboxylic acid or its anhydride is grafted onto a saturated hydrocarbon wax.

[0054] Examples of preferred unsaturated carboxylic acids or their anhydrides include acrylic acid, methacrylic acid, maleic acid, fumaric acid, citraconic acid, itaconic acid, 5-norbornene-2,3-dicarboxylic acid, or their anhydrides, and it is more preferable that they have a maleic acid group and / or a maleic anhydride group, and it is particularly preferable that they have a maleic anhydride group.

[0055] Examples of olefin polymers include α-olefin polymers such as polyethylene, polypropylene, and polybutylene, as well as ethylene-propylene copolymers and ethylene-butene copolymers. Polyethylene polymers or copolymers are preferred, and low-density polyethylene is more preferred.

[0056] The acid value of the acid-modified wax (D) is preferably 0.8 mg KOH / g or higher, and is particularly preferably 1.2 mg KOH / g or higher, 5 mg KOH / g or higher, 10 mg KOH / g or higher, 20 mg KOH / g or higher, 30 mg KOH / g or higher, 40 mg KOH / g or higher, or 50 mg KOH / g or higher, and may also be 70 mg KOH / g or higher. The upper limit of the acid value of the acid-modified wax (D) is preferably 150 mg KOH / g or lower, more preferably 140 mg KOH / g or lower, and particularly preferably 140 mg KOH / g or lower. The acid value is measured according to JIS K0070.

[0057] The viscosity-average molecular weight of the acid-modified wax (D) is preferably 1000 or more, preferably 20000 or less, and more preferably 15000 or less.

[0058] The acid-modified wax (D) content is 0.1 to 1.5 parts by mass per 100 parts by mass of the total of the polycarbonate resin (A) and thermoplastic polyester resin (B). By including it in this amount, the impact resistance of the polycarbonate resin composition can be improved. The acid-modified wax (D) content is preferably 0.2 parts by mass or more, and preferably 1.4 parts by mass or less. If the amount of acid-modified wax (D) is less than 0.1 parts by mass, the impact resistance effect is difficult to achieve, and if it exceeds 1.5 parts by mass, the amount of volatile components increases, leading to mold contamination.

[0059] [Elastomer] The polycarbonate resin composition of the present invention preferably contains an elastomer. As the elastomer, a copolymer obtained by graft copolymerizing a rubber component with a monomer component copolymerizable thereto is preferred. The method for producing such a graft copolymer may be any of the following methods: bulk polymerization, solution polymerization, suspension polymerization, emulsion polymerization, etc., and the copolymerization method may be single-stage grafting or multi-stage grafting.

[0060] The above rubber components typically have a glass transition temperature of 0°C or lower, preferably -20°C or lower, and more preferably -30°C or lower. Specific examples of rubber components include polybutadiene rubber, polyisoprene rubber or its hydrogenated derivatives, butadiene-acrylic composite rubber, styrene-butadiene rubber, ethylene-α-olefin rubbers such as ethylene-propylene rubber, ethylene-butene rubber, and ethylene-octene rubber, and ethylene-acrylic rubber. These may be used individually or in mixtures of two or more. Among these, polybutadiene rubber, polyisoprene rubber and its hydrogenated derivatives, and styrene-butadiene rubber are preferred. Rubber components such as polyalkyl acrylate rubbers like polybutyl acrylate, poly(2-ethylhexyl acrylate), or butyl acrylate-2-ethylhexyl acrylate copolymers, or silicone-based rubbers like organopolysiloxane rubber, are undesirable because they tend to increase the dielectric loss tangent.

[0061] Specific examples of monomer components that can be graft copolymerized with rubber components include aromatic vinyl compounds, vinyl cyanide compounds, (meth)acrylic acid ester compounds, epoxy group-containing (meth)acrylic acid ester compounds such as glycidyl (meth)acrylate; maleimide compounds such as maleimide, N-methylmaleimide, and N-phenylmaleimide; and α,β-unsaturated carboxylic acid compounds such as maleic acid, phthalic acid, and itaconic acid, and their anhydrides (e.g., maleic anhydride). These monomer components may be used individually or in combination of two or more. Among these, aromatic vinyl compounds and (meth)acrylic acid ester compounds are preferred, and styrene, methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, cyclohexyl (meth)acrylate, and octyl (meth)acrylate are particularly preferred.

[0062] The elastomer is preferably of the core / shell type graft copolymer type. In particular, a core / shell type graft copolymer is preferred, which consists of a core layer made of at least one rubber component selected from polybutadiene-containing rubber, ethylene / butylene rubber, and polybutyl acrylate-containing rubber, and a shell layer formed by copolymerizing (meth)acrylic acid ester around it, and a core / shell type elastomer with butadiene-based rubber as the core is especially preferred. In the above core / shell type graft copolymer, it is preferable that the rubber component is contained in 40% by mass or more, and more preferably 60% by mass or more. Furthermore, it is preferable that the (meth)acrylic acid component is contained in 10% by mass or more.

[0063] Preferred specific examples of these core / shell type graft copolymers include butadiene / methyl (meth)acrylate copolymer (MB), butadiene / methyl (meth)acrylate / styrene copolymer (MBS), and styrene / ethylene / butylene / styrene copolymer (SEBS), with butadiene / methyl (meth)acrylate copolymer (MB), butadiene / methyl (meth)acrylate / styrene copolymer (MBS), and styrene / ethylene / butylene / styrene copolymer (SEBS) being more preferred.

[0064] The preferred elastomer content is 2 to 10 parts by mass per 100 parts by mass of the total of the polycarbonate resin (A) and the thermoplastic polyester resin (B). Including it in this amount can further improve the impact resistance of the polycarbonate resin composition. The elastomer content is more preferably 2.5 parts by mass or more, even more preferably 3.0 parts by mass or more, particularly preferably 3.3 parts by mass or more, more preferably 8 parts by mass or less, and among these, 7 parts by mass or less, 6 parts by mass or less, and particularly preferably 4 parts by mass or less.

[0065] [Stabilizer] The polycarbonate resin composition of the present invention preferably contains a stabilizer, and phosphorus-based stabilizers or phenol-based stabilizers are preferred.

[0066] Any known phosphorus-based stabilizer can be used. Specific examples include phosphoric acid, phosphonic acid, phosphorous acid, phosphinic acid, polyphosphate and other phosphorus oxoacids; acidic pyrophosphate metal salts such as sodium acidic pyrophosphate, potassium acidic pyrophosphate, and calcium acidic pyrophosphate; phosphates of Group 1 or Group 2 metals such as potassium phosphate, sodium phosphate, cesium phosphate, and zinc phosphate; and organic phosphate compounds, organic phosphite compounds, and organic phosphonite compounds, with organic phosphite compounds being particularly preferred.

[0067] Examples of organic phosphite compounds include triphenyl phosphite, tris(mononylphenyl) phosphite, tris(mononyl / dinonylphenyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite, monooctyldiphenyl phosphite, dioctylmonophenyl phosphite, monodecyldiphenyl phosphite, didecylmonophenyl phosphite, tridecyl phosphite, trilauryl phosphite, tristearyl phosphite, and 2,2-methylenebis(4,6-di-tert-butylphenyl)octyl phosphite. Examples of such organic phosphite compounds include "ADEKA Stab 1178," "ADEKA Stab 2112," and "ADEKA Stab HP-10" from ADEKA Corporation, "JP-351," "JP-360," and "JP-3CP" from Johoku Chemical Industry Co., Ltd., and "Irgaphos 168" from BASF. Furthermore, the product may contain one type of phosphorus-based stabilizer, or two or more types in any combination and ratio.

[0068] The phosphorus-based stabilizer content is typically 0.001 parts by mass or more, preferably 0.01 parts by mass or more, and more preferably 0.03 parts by mass or more, per 100 parts by mass of the total of the polycarbonate resin (A) and the thermoplastic polyester resin (B), and is also typically 1 part by mass or less, preferably 0.7 parts by mass or less, and more preferably 0.5 parts by mass or less. If the phosphorus-based stabilizer content is below the lower limit of the above range, the thermal stabilization effect may be insufficient, and if the phosphorus-based stabilizer content exceeds the upper limit of the above range, the effect may plateau and become uneconomical.

[0069] Examples of phenolic stabilizers include hindered phenolic antioxidants. Specific examples include pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, thiodiethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N,N'-hexane-1,6-diylbis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionamide], 2,4-dimethyl-6-(1-methylpentadecyl)phenol, diethyl[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]phosphoate, 3,3',3”,5,5',5”-hexa-tert-butyl-a,a',a”-(mesitylene-2,4,6- Examples include triyl)tri-p-cresol, 4,6-bis(octylthiomethyl)-o-cresol, ethylenebis(oxyethylene)bis[3-(5-tert-butyl-4-hydroxy-m-tolyl)propionate], hexamethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 2,6-di-tert-butyl-4-(4,6-bis(octylthio)-1,3,5-triazine-2-ylamino)phenol, and 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4,6-di-tert-pentylphenyl acrylate.

[0070] Among these, pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate are preferred. Specific examples of such hindered phenol antioxidants include, for example, BASF's "Irganox 1010" and "Irganox 1076," and ADEKA's "ADEKA Stab AO-50" and "ADEKA Stab AO-60." Furthermore, the product may contain one type of phenolic stabilizer, or two or more types in any combination and ratio.

[0071] The content of the phenolic stabilizer is usually 0.001 parts by mass or more, preferably 0.01 parts by mass or more, and usually 1 part by mass or less, preferably 0.5 parts by mass or less, per 100 parts by mass of the total of the polycarbonate resin (A) and the thermoplastic polyester resin (B). By setting the content of the phenolic stabilizer above the lower limit of the above range, the effect of the phenolic stabilizer can be sufficiently obtained, and by setting it below the upper limit of the above range, the effect does not plateau, making it economical.

[0072] [Release agent] The polycarbonate resin composition of the present invention may also preferably contain a mold release agent. Examples of mold release agents include aliphatic alcohols, higher fatty acids, metal soaps, and waxes. Among these, partial ester compounds of polyhydric aliphatic alcohols and fatty acids having 10 to 22 carbon atoms are preferred.

[0073] Examples of polyhydric aliphatic alcohols include trihydric to hexhydric aliphatic alcohols such as glycerin, trimethylolpropane, pentaerythritol, mesoerythritol, pentitose, hexitol, and sorbitol. Examples of fatty acids with 10 to 22 carbon atoms include undecylic acid, lauric acid, dodecylic acid, myristic acid, pentadecylic acid, palmitic acid, heptadecylic acid, stearic acid, nonadecanoic acid, arachidic acid, and behenic acid. The carbon skeletons of these fatty acids may have substituents such as hydroxyl groups.

[0074] The ester compounds of the above-mentioned polyhydric aliphatic alcohol and the above-mentioned fatty acid are preferably substantially partial ester compounds. Particularly preferred are those in which 30% or more of the hydroxyl groups in the polyhydric alcohol remain unesterified. Specifically, examples include glycerin monostearate, glycerin distearate, glycerin monobehenate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol monobehenate, and pentaerythritol dibehenate. Such partial ester compounds may be used individually or as a mixture of two or more.

[0075] Furthermore, the above-mentioned release agent may contain one type, or two or more types in any combination and ratio. The release agent content is typically 0.001 parts by mass or more, preferably 0.01 parts by mass or more, and typically 2 parts by mass or less, preferably 1 part by mass or less, and more preferably 0.5 parts by mass or less, per 100 parts by mass of the total of the polycarbonate resin (A) and thermoplastic polyester resin (B). If the release agent content is below the lower limit of the above range, the release effect may not be sufficient, and if the release agent content exceeds the upper limit of the above range, a decrease in hydrolysis resistance and mold contamination during injection molding may occur.

[0076] [Additives, etc.] The polycarbonate resin composition of the present invention may contain other additives besides those mentioned above, such as fluorescent whitening agents, pigments (including carbon black), dyes, flame retardants, ultraviolet absorbers, impact modifiers, plasticizers, and compatibilizers. These additives may be present in one or more types.

[0077] Furthermore, the material may contain other resins besides polycarbonate resin (A) and thermoplastic polyester resin (B). Examples of other resins include styrene-based resins such as polystyrene resin, high-impact polystyrene resin (HIPS), acrylonitrile-styrene copolymer (AS resin), and acrylonitrile-butadiene-styrene copolymer (ABS resin); polyolefin resins such as polyethylene resin and polypropylene resin; polyamide resin; polyimide resin; polyetherimide resin; polyurethane resin; polyphenylene ether resin; polyphenylene sulfide resin; polysulfone resin; and polymethacrylate resin. Furthermore, other resins do not necessarily have to be included, and if they are included, it is preferable that the amount be 45 parts by mass or less per 100 parts by mass of the total of polycarbonate resin (A) and thermoplastic polyester resin (B), and in particular, 40 parts by mass or less, 30 parts by mass or less, 20 parts by mass or less, 10 parts by mass or less, 5 parts by mass or less, 3 parts by mass or less, 2 parts by mass or less, and especially 1 part by mass or less.

[0078] [Method for producing polycarbonate resin composition (pellets)] The kneading conditions for producing pellets from the polycarbonate resin composition of the present invention vary depending on the type and blending ratio of each component used in the polycarbonate resin composition. However, among the components of the polycarbonate resin composition, it is preferable to melt-knead wollastonite (C) separately from the other components. In particular, when melt-kneading using an extruder, it is preferable to side-feed wollastonite (C) and supply it from the middle of the extruder to a molten mixture in which the polycarbonate resin and other components have been sufficiently melt-kneaded and then melt-knead it. While there are no specific restrictions on the melting and mixing temperature, it is typically in the range of 240 to 320°C.

[0079] Polycarbonate resin composition pellets can be obtained by rapidly cooling strands extruded from an extruder in a water bath and cutting them using a pelletizer.

[0080] The polycarbonate resin composition of the present invention exhibits ductile fracture during tensile testing and demonstrates high toughness, so the tensile fracture strain measured according to ISO 527 is preferably 70% or more. Furthermore, the polycarbonate resin composition of the present invention exhibits excellent impact resistance, and therefore, the notched Charpy impact strength at a thickness of 4 mm, measured according to ISO 179, is preferably 13 kJ / m². 2 The above becomes possible. Furthermore, a 1 / 8-inch wide notched test specimen conforming to ASTM D256 exhibits a notched tensile strength of 65 MPa or higher in a tensile test conducted at -30°C. In addition, the flexural modulus measured according to ISO 178 is preferably 3000 MPa or higher. The details of the measurement methods for the tensile fracture nominal strain, notched tensile strength, and flexural modulus are as described in the examples.

[0081] The method for forming a molded article from polycarbonate resin composition pellets is not particularly limited, and conventionally known molding methods can be employed. Examples include injection molding, injection compression molding, extrusion molding, shape extrusion, transfer molding, hollow molding, gas-assisted hollow molding, blow molding, extrusion blow molding, IMC (in-mold coating) molding, rotational molding, multilayer molding, two-color molding, insert molding, sandwich molding, foam molding, and pressure molding. Among these, injection molding is particularly preferred.

[0082] There are no particular restrictions on the shape of the molded body, and it can be appropriately selected according to the application and purpose of the molded body. Examples include housings, plate-shaped, rod-shaped, sheet-shaped, film-shaped, cylindrical, annular, circular, elliptical, polygonal, irregularly shaped, hollow, frame-shaped, box-shaped, and panel-shaped products. [Examples]

[0083] The present invention will be described in more detail below with reference to examples. However, the present invention is not limited to the following examples. The components used in the examples and comparative examples are shown in Table 1 below.

[0084] [Table 1]

[0085] (Examples 1-8, Comparative Examples 1-11) Of the components listed above, all except wollastonite were blended in the proportions (parts by mass) shown in Tables 2 and 3 below. After mixing in a tumbler for 20 minutes, the wollastonite was side-fed, and the mixture was melt-kneaded at a cylinder temperature of 280°C using a twin-screw extruder with a screw diameter of 25 mm (TEX-25αIII manufactured by Japan Steel Works), and pellets were obtained by strand cutting.

[0086] <Tensile fracture strain (unit: %)> After drying the pellets obtained by the method described above at 100°C for 5 hours, injection molding was performed using a NEX80III injection molding machine manufactured by Nissei Plastic Industrial Co., Ltd. under the conditions of cylinder temperature 260°C, mold temperature 80°C, and molding cycle of 50 seconds to form ISO multipurpose test specimens (4 mm thick). Using the obtained test specimens, the tensile fracture strain (in %) was measured in accordance with the ISO 527 standard.

[0087] <Tensile strength with notches (unit: MPa)> The tensile strength (in MPa) of a notched specimen (notch R=0.5) with a width of 1 / 8 inch, conforming to ASTM D256, was measured during a tensile test at a -30°C environment. The surface of the test specimen was observed visually after measurement. In the table, specimens where the entire fracture surface was whitened and necking occurred, indicating ductile fracture, are labeled "ductile." Specimens where whitening was observed only around the notch of the specimen, indicating brittle fracture, are labeled "brittle."

[0088] <Flexural modulus (unit: MPa)> Using the above ISO multipurpose test specimen (4 mm), the flexural modulus (unit: MPa) was measured at 23°C in accordance with ISO 178.

[0089] <Charpy impact strength with notches> Using the ISO multipurpose test specimen (4mm thick) obtained above, the notched Charpy impact strength (unit: kJ / m²) was measured at a temperature of 23°C according to ISO 179. 2 ) was measured. The evaluation results are shown in Tables 2 and 3 below.

[0090] [Table 2]

[0091] [Table 3] [Industrial applicability]

[0092] The polycarbonate resin composition of the present invention exhibits excellent tensile elongation, notched tensile strength, flexural elasticity, and Charpy impact strength, making it suitable for use in various molded products, such as automotive exterior parts.

Claims

1. The mixture contains 50 to 80 parts by mass of polycarbonate resin (A) and 20 to 50 parts by mass of thermoplastic polyester resin (B), totaling 100 parts by mass, with 5 to 20 parts by mass of wollastonite (C) and 0.1 to 1.5 parts by mass of acid-modified wax (D). Wollastonite (C) is a polycarbonate resin composition characterized by having a volume-average fiber diameter of 1.0 to 6.0 μm, a volume-average fiber length of 10.0 to 20.0 μm, an aspect ratio of 3 or more, and being surface-treated with an alkylsilane having 8 to 14 carbon atoms.

2. The polycarbonate resin composition according to claim 1, wherein the tensile fracture strain measured in accordance with ISO 527 is 70% or more.

3. The notched Charpy impact strength of a 4 mm thick notched surface, measured according to ISO 179, was 13 kJ / m². ２ The polycarbonate resin composition according to claim 1 or 2, as described above.

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