Polycarbonate resin composition

Abstract

A polycarbonate resin composition that offers excellent impact resistance and metallic appearance, and does not produce flow streaks during molding. [Solution] A polycarbonate resin composition comprising 100 parts by mass of (A) and (B) in total, containing 50 to 100 parts by mass of polycarbonate resin (A) and 0 to 50 parts by mass of polyester resin (B), wherein the composition contains 2.0 to 5.0 parts by mass of a metal pigment (C) mainly composed of aluminum, 6.0 to 15.0 parts by mass of thermoplastic elastomer (D), and 0.5 to 1.5 parts by mass of organic particles (E), wherein the metal pigment (C) contains a metal pigment (c1) with an average particle diameter of 1 μm or more and less than 13 μm, and a metal pigment (c2) with an average particle diameter of 13 μm or more and 30 μm or less.

Description

Technical Field

[0001] The present invention relates to a polycarbonate resin composition, and more particularly to a polycarbonate resin composition having excellent impact resistance and metallic appearance and free from flow marks during molding, and a molded article thereof.

Background Art

[0002] Polycarbonate resins have excellent mechanical properties, electrical properties, and heat resistance, and are used in a wide range of fields such as automobiles, OA equipment, electrical and electronic parts, building materials, and household goods. When polycarbonate resin is used as a metal substitute material, a polycarbonate resin composition having a metallic tone is preferably used. Molded articles having a metallic appearance include those obtained by metallic coating or metal plating of a molded article made of a polycarbonate resin composition having no metallic appearance, or molded articles made of a polycarbonate resin composition having a metallic appearance. Among them, from the viewpoint of production efficiency and the like, molded articles formed from a polycarbonate resin composition having a metallic appearance are desirable.

[0003] Polycarbonate resin compositions having a metallic appearance generally contain particles having metallic luster. As such a resin composition, for example, Patent Document 1 discloses a polycarbonate resin composition obtained by blending a glass flake coated with a metal in a predetermined ratio with a polycarbonate resin. However, in a resin composition in which a metallic pigment or the like is blended with a polycarbonate resin, there is a problem that the molecular weight of the polycarbonate resin tends to decrease during melting and kneading, and the impact resistance tends to decrease. Further, Patent Document 2 by the present applicant proposes that a polycarbonate resin composition containing a plate-like pigment having aluminum as a main component, specific average particle size, aspect ratio, and iron content concentration and an organic phosphate ester compound can produce a molded article having excellent metallic appearance and heat and humidity resistance, and has excellent retention heat stability.

[0004] However, the specifications required for metallic finishes in recent years have become extremely sophisticated. For example, to create a more luxurious feel, such as a satin finish, there is a demand for a deep metallic look with excellent luster and high gloss. Even if a metallic finish is present, a strong grainy texture from the metallic pigments, i.e., a highly granular texture, is undesirable. Furthermore, in the case of products with a metallic appearance, such as automotive interior parts, bosses and other features are usually provided on the back side. However, these areas present a problem in that metallic pigments appear in streaks during molding, making them prone to flow streaks. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2002-038000 [Patent Document 2] Japanese Patent Publication No. 2013-139516 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] Therefore, there is a strong demand for a polycarbonate resin composition that offers excellent impact resistance and a high degree of metallic appearance, and furthermore, does not produce flow streaks. [Means for solving the problem]

[0007] The inventors, after diligent research to achieve the above objectives, have found that a resin composition containing a polycarbonate resin (A)-rich resin component, which may also contain polyester resin (B), a metal pigment (C) mainly composed of aluminum, a thermoplastic elastomer (D), and organic particles (E), wherein the metal pigment (C) is a combination of a metal pigment with a small average particle size (c1) and a metal pigment with a large average particle size (c2), each included in specific amounts, can solve the above problems. This invention relates to the following polycarbonate resin compositions and molded articles.

[0008] 1. A polycarbonate resin composition comprising 100 parts by mass of (A) and (B) in total, containing 50 to 100 parts by mass of polycarbonate resin (A) and 0 to 50 parts by mass of polyester resin (B), with the addition of 2.0 to 5.0 parts by mass of a metal pigment (C) mainly composed of aluminum, 6.0 to 15.0 parts by mass of thermoplastic elastomer (D), and 0.5 to 1.5 parts by mass of organic particles (E), wherein the metal pigment (C) contains a metal pigment (c1) with an average particle diameter of 1 μm or more and less than 13 μm, and a metal pigment (c2) with an average particle diameter of 13 μm or more and 30 μm or less. 2. The polycarbonate resin composition according to item 1, wherein the mass ratio (c1) / (c2) of the content of metal pigments (c1) and (c2) is greater than 1.0. 3. The polycarbonate resin composition according to 1 or 2 above, further containing 0.005 to 0.5 parts by mass of hydrogen siloxane (F) per 100 parts by mass of the total of polycarbonate resin (A) and polyester resin (B). 4. A molded article obtained by molding the polycarbonate resin composition described in 1 or 2 above. 5. Pellets of the polycarbonate resin composition described in 1 or 2 above. 6. A molded article obtained by molding the polycarbonate resin composition pellets described in item 5 above. [Effects of the Invention]

[0009] The polycarbonate resin composition of the present invention has excellent impact resistance, a high degree of metallic appearance, excellent particle texture and luster, and is free from flow streaks, making it particularly useful as a molded product for various applications requiring a high degree of metallic appearance. [Modes for carrying out the invention]

[0010] 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.

[0011] The polycarbonate resin composition of the present invention contains 50 to 100 parts by mass of polycarbonate resin (A) and 0 to 50 parts by mass of polyester resin (B), totaling 100 parts by mass of (A) and (B), with 2.0 to 5.0 parts by mass of a metal pigment (C) mainly composed of aluminum, 6.0 to 15.0 parts by mass of thermoplastic elastomer (D), and 0.5 to 1.5 parts by mass of organic particles (E), wherein the metal pigment (C) contains a metal pigment (c1) with an average particle diameter of 1 μm or more and less than 13 μm, and a metal pigment (c2) with an average particle diameter of 13 μm or more and 30 μm or less.

[0012] [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.

[0013] 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;

[0014] Dihydroxynaphthalene compounds 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, and 2,7-dihydroxynaphthalene;

[0015] Dihydroxydiaryl ethers such as 2,2'-dihydroxydiphenyl ether, 3,3'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dimethyldiphenyl 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,[[ID=3l]] 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 (i.e., bisphenol A) and 2,2-bis(3-methyl-4-hydroxyphenyl)propane (i.e., bisphenol C) 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, 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 the viscosity-average molecular weight (Mv) calculated from the solution viscosity measured at 25°C using methylene chloride as the solvent, preferably 10,000 to 50,000, more preferably 11,000 to 40,000, and most preferably 12,000 to 35,000, and especially preferably 13,000 to 30,000. 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, in order to improve the appearance and fluidity of the molded product, the polycarbonate resin (A) may contain polycarbonate oligomers. The viscosity-average molecular weight [Mv] of these polycarbonate oligomers is usually 1500 or more, preferably 2000 or more, and usually 9500 or less, preferably 9000 or less. Moreover, it is preferable that the amount of polycarbonate oligomers contained be 30% by mass or less of the polycarbonate resin (including the polycarbonate oligomers).

[0028] Furthermore, the polycarbonate resin (A) may be made not only from virgin raw materials but also from polycarbonate resin recycled from used products (so-called material-recycled polycarbonate resin), and it is preferable to contain both virgin polycarbonate resin and recycled polycarbonate resin, or to consist solely of recycled polycarbonate resin. When recycled polycarbonate resin is included, the proportion of recycled polycarbonate resin in polycarbonate resin (A) is preferably 30% or more, 40% or more, 50% or more, 60% or more, or 80% or more, and it is also preferable for recycled polycarbonate resin to be 100%.

[0029] [Polyester resin (B)] The polyester resin (B) is a polymer or copolymer obtained by a condensation reaction mainly consisting of a dicarboxylic acid component, which is composed of dicarboxylic acids or their reactive derivatives, and a diol component, which is composed 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 composed 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, 2,6-naphthalenedicarboxylic acid, and their alkyl ester derivatives are more preferred, and terephthalic acid and its 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, 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% or more, and more preferably 90% or more, of the 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 polyester resin (B) include polybutylene terephthalate, polybutylene naphthalate, polycyclohexanedimethanol terephthalate, polyethylene terephthalate, and polyethylene naphthalate. These may contain copolymer components. In the present invention, polyethylene terephthalate (PET) and polybutylene terephthalate (PBT) are preferred, and it is also preferable to use both in combination. When using both, the ratio of PET:PBT is preferably 8:1 to 1:8 (by mass).

[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 polycarbonate resin composition 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 the 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 molecular weight of polyester resin (B) is preferably such that its intrinsic viscosity (Iv), measured at 30°C in a mixed solvent of phenol and tetrachloroethane (mass ratio = 50 / 50), is between 0.4 and 2.0. If an intrinsic viscosity of less than 0.4 is used, the mechanical strength of the resin composition will be inferior, while if it exceeds 2.0, the moldability tends to decrease. The preferred intrinsic viscosity of polyester resin (B) is between 0.6 and 1.2.

[0042] Furthermore, the polyester resin (B) can be made from virgin materials as well as recycled materials from used products, or so-called material recycled materials. It can also be made from recycled materials from defective products, sprues, runners, etc., produced during molding. It is preferable to use such recycled materials for the polyester resin (B).

[0043] The content of polycarbonate resin (A) and polyester resin (B) is such that, based on a total of 100 parts by mass of polycarbonate resin (A) and polyester resin (B), polycarbonate resin (A) is 50 to 100 parts by mass and polyester resin (B) is 0 to 50 parts by mass. Since polyester resin has inferior heat resistance, thermal stability, and dimensional stability compared to polycarbonate resin, these properties tend to deteriorate if the amount of polyester resin is too high. Therefore, if the content of polyester resin (B) exceeds 50 parts by mass, the heat resistance, heat retention stability, and dimensional stability of the polycarbonate resin composition of the present invention tend to deteriorate. The polyester resin (B) content is preferably 45 parts by mass or less, more preferably 40 parts by mass or less. Furthermore, it is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, even more preferably 15 parts by mass or more, and particularly preferably 20 parts by mass or more.

[0044] [Aluminum-based metallic pigment (C)] The polycarbonate resin composition of the present invention contains a metal pigment (C) mainly composed of aluminum. Here, "main component" refers to a component whose content in the metal pigment is 50% by mass or more. That is, the metal pigment contains 50% by mass or more of aluminum. Here, the aluminum content in the metal pigment is preferably 95% by mass or more, more preferably 98% by mass or more, and most preferably 99% by mass or more.

[0045] The metal pigment (C) contains a combination of metal pigment (c1) with an average particle size of 1 μm or more and less than 13 μm and metal pigment (c2) with an average particle size of 13 μm or more and 30 μm or less. The combined content of metal pigment (C) (c1) and (c2) is 2.0 to 5.0 parts by mass per 100 parts by mass of the total of polycarbonate resin (A) and polyester resin (B).

[0046] If the average particle size of the metal pigment (C) exceeds 30 μm, the impact resistance of the resin composition deteriorates. Furthermore, if the content of metal pigment (C) exceeds 5.0 parts by mass, the impact resistance worsens, and if the content of metal pigment (C) falls below 2.0 parts by mass, flow streaks are more likely to occur in the molded product. If metallic pigment (c2) with an average particle size of 13 μm to 30 μm is not included, or if only metallic pigment (c2) is included, the particle texture as a metallic appearance will be poor. If metallic pigment (c2) with an average particle size of 13 μm to 30 μm is not included, or if only metallic pigment (c2) is included, the luminosity will not be high. It is difficult to achieve a good metallic appearance with only metallic pigment (c1) or (c2).

[0047] The content of the metal pigment (C), which is a combination of metal pigments (c1) and (c2), is preferably 2.5 parts by mass or more, more preferably 3.0 parts by mass, preferably 4.5 parts by mass or less, and more preferably 4 parts by mass or less, based on 100 parts by mass of the total of polycarbonate resin (A) and polyester resin (B).

[0048] The average particle size of the metal pigment (c1) is preferably 3 μm or more, more preferably 5 μm or more, preferably 11 μm or less, and more preferably 9 μm or less. The average particle size of the metal pigment (c2) is preferably 15 μm or more, more preferably 17 μm or more, preferably 26 μm or less, and more preferably 22 μm or less.

[0049] Furthermore, the mass ratio (c1) / (c2) of the content of metal pigments (c1) and (c2) is preferably greater than 1.0. By setting the mass ratio (c1) / (c2) of the content to greater than 1.0, and more preferably to 1.5 or more, a better metallic appearance can be achieved. The upper limit of the mass ratio (c1) / (c2) of the content is preferably 10.

[0050] Furthermore, the iron content in the metal pigment (C) is preferably 3000 ppm by mass or less. More preferably, the iron content is 2000 ppm by mass or less. By having the iron content at the above amounts, the deterioration of the polycarbonate resin composition can be more effectively suppressed, and defects in the appearance of the molded product can be more sufficiently suppressed.

[0051] The metal pigment (C), which mainly consists of aluminum, is preferably in flake form, has an average particle size L of 1 to 100 μm, and has an aspect ratio L / d, defined as the ratio of L to the average thickness d, which is preferably 1 to 100.

[0052] Here, average particle size L refers to the average value of the particle size of the metallic pigment, and particle size is defined as the maximum distance between two intersection points of a straight line crossing the main surface and the contour of the main surface when the main surface of a plate-shaped metallic pigment is observed with a scanning electron microscope. The "main surface" refers to the surface perpendicular to the thickness direction when the metallic pigment is in plate form. The average thickness d refers to the average value of the plate-shaped thickness when the metallic pigment is in plate form, and thickness refers to the maximum size of the line connecting points on the periphery of two main surfaces perpendicular to the thickness direction of the metallic pigment when the metallic pigment is observed with a scanning electron microscope. Here, the size of the line connecting points on the periphery of two main surfaces refers to the size of the line that minimizes the distance from any point on the periphery of one main surface to a point on the periphery of the other main surface. The average particle size L is preferably 3 to 60 μm, and more preferably 5 to 40 μm. When the average particle size L is within the range of 3 to 60 μm, there is an advantage that the metallic appearance, especially the luster, is better than when it is outside that range. Furthermore, the aspect ratio of the metallic pigment is preferably 5 to 30, and more preferably 7 to 25. When the aspect ratio is within the range of 5 to 30, a better balance between heat resistance and metallic appearance is achieved compared to when it falls outside this range.

[0053] It is preferable to prepare the metal pigment (C) in advance as a masterbatch with a thermoplastic resin, and then melt-knead this masterbatch with the other components to produce the polycarbonate resin composition of the present invention. Various thermoplastic resins can be used as the thermoplastic resin for masterbatch formation, but polycarbonate resin, polyester resin, acrylonitrile-styrene copolymer (AS resin) are preferred, and polycarbonate resin is particularly preferred. The content of the metal pigment (C) in the masterbatch is preferably 5 to 50% by mass, more preferably 5 to 45% by mass, 5 to 40% by mass, 5 to 35% by mass, 5 to 30% by mass, 5 to 25% by mass, 5 to 20% by mass, and especially preferably 5 to 15% by mass.

[0054] [Thermoplastic elastomer (D)] The polycarbonate resin composition of the present invention contains 6.0 to 15.0 parts by mass of thermoplastic elastomer (D) per 100 parts by mass of polycarbonate resin (A) and polyester resin (B). By including thermoplastic elastomer (D) in this amount, impact resistance is improved, making it possible to prevent cracking and damage to molded products due to unexpected external stresses.

[0055] As the thermoplastic elastomer (D), 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.

[0056] 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, polyalkyl acrylate rubber such as polybutyl acrylate, poly(2-ethylhexyl acrylate), and butyl acrylate-2-ethylhexyl acrylate copolymer, silicone rubber such as polyorganosiloxane rubber, butadiene-acrylic composite rubber, IPN-type composite rubber consisting of polyorganosiloxane rubber and polyalkyl acrylate rubber, styrene-butadiene rubber, ethylene-α-olefin rubber such as ethylene-propylene rubber, ethylene-butene rubber, and ethylene-octene rubber, ethylene-acrylic rubber, and fluororubber. These may be used individually or in combination of two or more. Among these, polybutadiene rubber, polyalkyl acrylate rubber, IPN-type composite rubber consisting of polyorganosiloxane rubber and polyalkyl acrylate rubber, and styrene-butadiene rubber are preferred in terms of mechanical properties and surface appearance.

[0057] 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, vinyl cyanide compounds, (meth)acrylic acid ester compounds, and (meth)acrylic acid compounds are preferred in terms of mechanical properties and surface appearance, and (meth)acrylic acid ester compounds are more preferred. Specific examples of (meth)acrylic acid ester compounds include methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, cyclohexyl (meth)acrylate, and octyl (meth)acrylate.

[0058] The thermoplastic elastomer (D) is preferably of the core / shell type graft copolymer type from the viewpoint of impact resistance and surface appearance. Among these, a core / shell type graft copolymer is particularly preferred, comprising a core layer made of at least one rubber component selected from polybutadiene-containing rubber, polybutyl acrylate-containing rubber, and IPN-type composite rubber consisting of polyorganosiloxane rubber and polyalkyl acrylate rubber, and a shell layer formed by copolymerizing (meth)acrylic acid ester around it. 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.

[0059] Preferred specific examples of these core / shell type graft copolymers include methyl methacrylate-butadiene-styrene copolymer (MBS), methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS), methyl methacrylate-butadiene copolymer (MB), methyl methacrylate-acrylic rubber copolymer (MA), methyl methacrylate-acrylic rubber-styrene copolymer (MAS), methyl methacrylate-acrylic butadiene rubber copolymer, methyl methacrylate-acrylic butadiene rubber-styrene copolymer, and methyl methacrylate-(acrylic silicone IPN rubber) copolymer. Such rubbery polymers may be used individually or in combination of two or more.

[0060] The content of thermoplastic elastomer (D) is 3.0 to 15.0 parts by mass per 100 parts by mass of the total of polycarbonate resin (A) and polyester resin (B), preferably 3.0 to 13.0 parts by mass, more preferably 3.0 to 12.0 parts by mass, 6.0 to 11.0 parts by mass, and particularly preferably 6.0 to 10.0 parts by mass. If the content of thermoplastic elastomer (D) in the polycarbonate resin composition is too low, the effect of improving impact resistance due to the inclusion of thermoplastic elastomer (D) cannot be fully obtained, and if it is too high, surface hardness, heat resistance, and rigidity tend to decrease.

[0061] [Organic particles (E)] The polycarbonate resin composition of the present invention contains organic particles (E). Examples of organic particles (E) include silicone resins, acrylic resins, styrene resins, and butadiene resins. Specifically, crosslinked acrylic resin particles and silicone resin organic particles are preferred examples.

[0062] Preferred acrylic resin particles include polymer particles based on partially crosslinked methyl methacrylate, acrylic polymer particles with a core / shell structure, and polymer particles having a core / shell structure that include a rubbery vinyl polymer core and shell. Preferred acrylic polymer particles with a core / shell structure include acrylic polymers having a polyalkyl acrylate core and a polyalkyl acrylate shell, such as polymer particles having a poly(butyl acrylate) core and a poly(methyl methacrylate) shell.

[0063] Examples of silicone polymer particles include cross-linked silicone resin particles and silicone rubber powder obtained by coating silicone rubber with silicone resin. Both core / shell and single-layer structures are suitable.

[0064] The preferred average particle size of the organic particles (E) is 0.1 to 50 μm, more preferably 0.5 to 30 μm, and even more preferably 1 to 20 μm.

[0065] The content of organic particles (E) is 0.5 to 1.5 parts by mass per 100 parts by mass of the total of polycarbonate resin (A) and polyester resin (B). Preferably, it is 0.6 parts by mass or more, and preferably 1.3 parts by mass or less. If the content of organic particles (E) is less than 0.5 parts by mass, it may be difficult to obtain a matte effect, and the matte, high-quality texture may be insufficient. If the content is more than 1.5 parts by mass, the impact resistance will be poor.

[0066] [Hydrogen siloxane (F)] The polycarbonate resin composition of the present invention preferably further contains hydrogen siloxane (F). The inclusion of hydrogen siloxane (F) can further enhance the decomposition-inhibiting effect of the polycarbonate resin (A).

[0067] Hydrogen siloxane (F) is an organosilicon compound containing a Si-H group, and is not particularly limited as long as it is a compound having a Si-H group in its molecule; it can be appropriately selected and used. Among these, poly(methylhydrogensiloxane), polycyclo(methylhydrogensiloxane), poly(ethylhydrogensiloxane), poly(phenylhydrogensiloxane), poly[(methylhydrogensiloxane)(dimethylsiloxane)] copolymer, poly[(methylhydrogensiloxane)(ethylmethylsiloxane)] copolymer, poly[(methylhydrogensiloxane)(diethylsiloxane)] copolymer, poly[(methylhydrogensiloxane)(hexylmethylsiloxane)] copolymer, poly[(methylhydrogensiloxane)(octylmethylsiloxane)] copolymer Polyorganohydrogensiloxanes such as rimers, poly[(methylhydrogensiloxane)(phenylmethylsiloxane)] copolymer, poly[(methylhydrogensiloxane)(diethoxysiloxane)] copolymer, poly[(methylhydrogensiloxane)(dimethoxysiloxane)] copolymer, poly[(methylhydrogensiloxane)(3,3,3-trifluoropropylmethylsiloxane)] copolymer, poly[(dihydrogensiloxane)((2-methoxyethoxy)methylsiloxane)] copolymer, and poly[(dihydrogensiloxane)(phenoxymethylsiloxane)] copolymer are preferred.

[0068] When hydrogen siloxane (F) is included, its content is preferably 0.005 to 0.5 parts by mass, more preferably 0.01 to 0.4 parts by mass, 0.02 to 0.3 parts by mass, 0.03 to 0.3 parts by mass, 0.04 to 0.2 parts by mass, and particularly preferably 0.04 to 0.1 parts by mass, per 100 parts by mass of the total of polycarbonate resin (A) and polyester resin (B). If the hydrogen siloxane (F) content is less than the lower limit above, the decomposition suppression effect of the polycarbonate resin (A) due to the inclusion of hydrogen siloxane (F) cannot be sufficiently obtained, and if the hydrogen siloxane (F) content is more than the upper limit above, gas will be generated during melt mixing, which is likely to cause mold deposits.

[0069] [Stabilizer] The polycarbonate resin composition of the present invention preferably contains a stabilizer, and phosphorus-based stabilizers or phenol-based stabilizers are preferred.

[0070] 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.

[0071] 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.

[0072] 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 polycarbonate resin (A) and 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.

[0073] 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.

[0074] 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.

[0075] 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 polycarbonate resin (A) and 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.

[0076] [Release agent] The resin composition of the present invention preferably contains a mold release agent. Examples of release agents include aliphatic carboxylic acids, esters of aliphatic carboxylic acids and alcohols, aliphatic hydrocarbons with a number average molecular weight of 200 to 15,000, and polysiloxane-based silicone oils.

[0077] Examples of aliphatic carboxylic acids include saturated or unsaturated aliphatic monovalent, divalent, or trivalent carboxylic acids. Here, aliphatic carboxylic acids also include alicyclic carboxylic acids. Among these, preferred aliphatic carboxylic acids are monovalent or divalent carboxylic acids having 6 to 36 carbon atoms, and more preferably aliphatic saturated monovalent carboxylic acids having 6 to 36 carbon atoms. Specific examples of such aliphatic carboxylic acids include palmitic acid, stearic acid, caproic acid, capric acid, lauric acid, arachidic acid, behenic acid, lignoceric acid, cerotic acid, melissic acid, tetrariacontanoic acid, montanic acid, adipic acid, and azelaic acid.

[0078] As the aliphatic carboxylic acid in the ester of an aliphatic carboxylic acid and an alcohol, for example, the same aliphatic carboxylic acid as described above can be used. On the other hand, as the alcohol, for example, saturated or unsaturated monohydric or polyhydric alcohols can be used. These alcohols may have substituents such as fluorine atoms or aryl groups. Among these, monohydric or polyhydric saturated alcohols having 30 or fewer carbon atoms are preferred, and aliphatic saturated monohydric alcohols or aliphatic saturated polyhydric alcohols having 30 or fewer carbon atoms are more preferred. Here, "aliphatic" is used as a term that also includes alicyclic compounds.

[0079] Specific examples of such alcohols include octanol, decanol, dodecanol, stearyl alcohol, behenyl alcohol, ethylene glycol, diethylene glycol, glycerin, pentaerythritol, 2,2-dihydroxyperfluoropropanol, neopentylene glycol, ditrimethylolpropane, and dipentaerythritol.

[0080] Furthermore, the above-mentioned esters may contain aliphatic carboxylic acids and / or alcohols as impurities. Also, the above-mentioned esters may be pure substances or mixtures of multiple compounds. Moreover, the aliphatic carboxylic acids and alcohols that combine to form a single ester may be used individually, or two or more may be used in any combination and ratio.

[0081] Specific examples of esters of aliphatic carboxylic acids and alcohols include beeswax (a mixture mainly composed of myricyl palmitate), stearyl stearate, behenyl behenate, stearyl behenate, glycerin monopalmitate, glycerin monostearate, glycerin distearate, glycerin tristearate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, and pentaerythritol tetrastearate.

[0082] Examples of aliphatic hydrocarbons with a number-average molecular weight of 200 to 15,000 include liquid paraffin, paraffin wax, microwax, polyethylene wax, Fischer-Tropsch wax, and α-olefin oligomers having 3 to 12 carbon atoms. Note that alicyclic hydrocarbons are also included in the definition of aliphatic hydrocarbons. Furthermore, these hydrocarbons may be partially oxidized. Among these, paraffin wax, polyethylene wax, or partially oxided polyethylene wax are preferred, and paraffin wax and polyethylene wax are more preferred. Furthermore, the number-average molecular weight of the aliphatic hydrocarbon is preferably 5000 or less. Furthermore, while aliphatic hydrocarbons may be single substances, mixtures of substances with varying constituent components and molecular weights can also be used as long as the main component falls within the above-mentioned range.

[0083] Examples of polysiloxane-based silicone oils include dimethyl silicone oil, methylphenyl silicone oil, diphenyl silicone oil, and fluorinated alkyl silicone.

[0084] Furthermore, the above-mentioned release agent may contain one type, or two or more types in any combination and ratio.

[0085] The release agent content is preferably 0.1 to 2 parts by mass, more preferably 1 part by mass or less, even more preferably 0.8 parts by mass or less, and particularly preferably 0.5 parts by mass or less, based on 100 parts by mass of the total of polycarbonate resin (A) and polyester resin (B). If the release agent content is below the lower limit of the above range, the release effect is likely to be insufficient, and if it exceeds the upper limit of the above range, a decrease in hydrolysis resistance and mold contamination during injection molding may occur.

[0086] [UV absorber] The resin composition of the present invention preferably contains a mold release agent. As ultraviolet absorbers, organic ultraviolet absorbers are preferred because they provide good transparency and mechanical properties to the polycarbonate resin composition. Examples include benzotriazole compounds, benzophenone compounds, salicylate compounds, cyanoacrylate compounds, triazine compounds, oxanilide compounds, malonic acid ester compounds, and hindered amine compounds. Among these, benzotriazole compounds are more preferred. By selecting an organic ultraviolet absorber, the resin composition of the present invention will have good transparency and mechanical properties.

[0087] Specific examples of benzotriazole compounds include, for example, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-[2'-hydroxy-3',5'-bis(α,α-dimethylbenzyl)phenyl]-benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butyl-phenyl)-benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butyl-phenyl)-5-chlorobenzotriazole), and 2-(2'-hydroxy-3',5'-di-ter Examples include t-amyl)-benzotriazole, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, and 2,2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazole-2-yl)phenol], among which 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole and 2,2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazole-2-yl)phenol] are preferred, and 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole is particularly preferred.

[0088] Specific examples of benzophenone compounds include, for example, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, 2-hydroxy-4-n-octoxybenzophenone, 2-hydroxy-n-dodecyloxybenzophenone, bis(5-benzoyl-4-hydroxy-2-methoxyphenyl)methane, 2,2'-dihydroxy-4-methoxybenzophenone, and 2,2'-dihydroxy-4,4'-dimethoxybenzophenone.

[0089] Specific examples of salicylate compounds include, for example, phenyl salicylate and 4-tert-butylphenyl salicylate. Specific examples of cyanoacrylate compounds include, for example, ethyl-2-cyano-3,3-diphenylacrylate and 2-ethylhexyl-2-cyano-3,3-diphenylacrylate. Specific examples of oxalinide compounds include, for example, 2-ethoxy-2'-ethyloxalinic acid bisalinide. As the malonic acid ester compound, 2-(alkylidene)malonic acid esters are preferred, and 2-(1-arylalkylidene)malonic acid esters are more preferred.

[0090] When an ultraviolet absorber is included, its content is usually 0.05 parts by mass or more, preferably 0.1 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 polycarbonate resin (A) and polyester resin (B). If the content of the ultraviolet absorber is below the lower limit of the above range, the improvement effect on weather resistance and light resistance may be insufficient, and if the content of the ultraviolet absorber exceeds the upper limit of the above range, mold deposits and the like may occur, causing mold contamination. The ultraviolet absorber may contain one type, or two or more types in any combination and ratio.

[0091] [Additives, etc.] The polycarbonate resin composition of the present invention may contain other additives besides those mentioned above, such as flame retardants, fillers, fluorescent whitening agents, dyes, plasticizers, and compatibilizers (including epoxy compounds as reactive compatibilizers). These additives may be present in one or more types.

[0092] Furthermore, it is possible to include other resins besides polycarbonate resin (A) in smaller amounts than polycarbonate resin (A). 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. When other resins are included besides polycarbonate resin (A), the content is preferably 45 parts by mass or less per 100 parts by mass of polycarbonate resin (A), and more preferably 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.

[0093] [Polycarbonate resin composition] The polycarbonate resin composition of the present invention is molded into a molded article. The manufacturing method for the molded product can be any molding method commonly used for polycarbonate resin compositions. Examples include injection molding, ultra-high-speed injection molding, injection compression molding, two-color molding, hollow molding methods such as gas-assisted molding, molding using insulated molds, molding using rapidly heated molds, foam molding (including supercritical fluids), insert molding, IMC (in-mold coating) molding, extrusion molding, sheet molding, thermoforming, rotational molding, lamination molding, press molding, and blow molding. Molding methods using a hot runner system can also be used. Among these, injection molding methods such as injection molding, ultra-high-speed injection molding, and injection compression molding are preferred.

[0094] [Molded products] Examples of molded products include electrical and electronic equipment, office automation equipment, information terminal equipment, machine parts, home appliances, vehicle parts, building materials, various containers, leisure goods and miscellaneous items, and lighting equipment components. In particular, molded products of the polycarbonate resin composition of the present invention are especially suitable for use in interior parts for vehicles and aircraft, such as components for car interior handles, because they possess a metallic, high-quality luster and depth, as well as high brightness. [Examples]

[0095] 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.

[0096] [Table 1]

[0097] (Examples 1-4, Comparative Examples 1-10) [Manufacturing of resin composition pellets] Each of the above components was blended in the proportions (parts by mass) shown in Table 2-3 below and mixed in a tumbler for 20 minutes. Note that the metal pigments (c1) to (c3) used were a polycarbonate masterbatch containing 10% by mass of aluminum flakes. Therefore, the metal pigment (c1) to (c3) columns in the table show the parts by mass of the aluminum flakes alone, while the parts by mass of the polycarbonate resin, which makes up 90% by mass of the masterbatch, are listed separately in Table 2-3. The mixture, prepared in a tumbler, was supplied to a twin-screw extruder "TEX30α" manufactured by Japan Steel Works, Ltd., equipped with one vent. The mixture was kneaded under the conditions of a screw rotation speed of 200 rpm, a discharge rate of 30 kg / hr, and a barrel temperature of 280°C. The molten resin extruded in strand form was rapidly cooled in a water bath and pelletized using a pelletizer to obtain pellets of polycarbonate resin composition.

[0098] The pellets obtained above were dried at 120°C for 5 hours, and then 4 mm thick ISO dumbbell test pieces were molded using a NEX80 injection molding machine manufactured by Nissei Plastic Industrial Co., Ltd. under the following conditions: cylinder temperature 280°C, mold temperature 80°C, injection speed 30 mm / s, and holding pressure 80 MPa.

[0099] [Evaluation of Charpy impact strength (with notch)] Using the ISO dumbbell piece (4 mm thick) obtained above, the notched Charpy strength (unit: kJ / m) was measured according to ISO 179. 2 ) was measured. The Charpy impact strength is 20 kJ / m 2 It is preferable that the above conditions are met.

[0100] [Evaluation of metallic appearance] The ISO dumbbell pieces (4 mm thick) obtained above were evaluated by measuring the following graininess, luster intensity, and gloss using the BYK-mac i multi-angle colorimeter manufactured by BYK-Chemie. This multi-angle colorimeter uses LEDs to illuminate the sample surface at three angles: 15°, 45°, and 75°. It captures images with a vertically positioned CCD chip, analyzes them using an image analysis algorithm, and determines the grain density (G value) and luster intensity (Si). 15The gloss value (60°) and gloss level (60°) are calculated.

[0101] The particle size (G value) is preferably in the range of 1.5 to 2.5, and the brightness intensity (Si 15 The gloss value is preferably 1.0 to 2.5, and the gloss (60°) is preferably 91 or higher.

[0102] [Evaluation of fluid fibers] The pellets obtained as described above were dried at 120°C for 5 hours. Then, using a NEX80 injection molding machine manufactured by Nissei Plastic Industrial Co., Ltd., a plate-shaped molded product with a boss section measuring 4 mm in diameter and 7 mm in height was formed on a 100 mm × 150 mm × 1 mm thick plate under the following conditions: cylinder temperature 280°C, mold temperature 80°C, injection speed 30 mm / s, and holding pressure 80 MPa. The appearance of the boss portion of the obtained molded product, viewed from the rear in the flow direction, was visually observed and evaluated according to the following criteria A to C. A: The flow pattern is unclear and small. B: The flow pattern is unclear but somewhat large. C: The flow pattern is clear and large.

[0103] The results are shown in Tables 2 and 3.

[0104] [Table 2]

[0105] [Table 3] [Industrial applicability]

[0106] The molded articles of the polycarbonate resin composition of the present invention possess a metallic, high-quality luster and depth, as well as high brightness, making them suitable for use in various parts and components.

Claims

1. A polycarbonate resin composition comprising 50 to 100 parts by mass of polycarbonate resin (A) and 0 to 50 parts by mass of polyester resin (B), in a total of 100 parts by mass of (A) and (B), wherein the composition contains 2.0 to 5.0 parts by mass of a metal pigment (C) mainly composed of aluminum, 6.0 to 15.0 parts by mass of thermoplastic elastomer (D), and 0.5 to 1.5 parts by mass of organic particles (E), wherein the metal pigment (C) contains a metal pigment (c1) with an average particle diameter of 1 μm or more and less than 13 μm, and a metal pigment (c2) with an average particle diameter of 13 μm or more and 30 μm or less.

2. The polycarbonate resin composition according to claim 1, wherein the mass ratio (c1) / (c2) of the content of metal pigments (c1) and (c2) is greater than 1.

0.

3. Furthermore, the polycarbonate resin composition according to claim 1 or 2, further containing 0.005 to 0.5 parts by mass of hydrogen siloxane (F) per 100 parts by mass of the total of polycarbonate resin (A) and polyester resin (B).

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

5. Pellets of the polycarbonate resin composition according to claim 1 or 2.

6. A molded article obtained by molding the polycarbonate resin composition pellets described in claim 5.

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