Polycarbonate resin composition and molded article thereof

Abstract

The present invention is a polycarbonate resin composition containing: a polycarbonate resin (S) including a polycarbonate-polyorganosiloxane copolymer (A) that includes a polycarbonate block (A-1) comprising specific repeating units and a polyorganosiloxane block (A-2) including specific repeating units; and a copolymer (B) having a constituent unit (b-1) having a specific structure, a constituent unit (b-2) having a specific structure, and a constituent unit (b-3) having a specific structure.

Description

[Technical Field]

[0001] The present invention relates to a polycarbonate resin composition and a molded article thereof. [Background technology]

[0002] Polycarbonate resins are excellent in impact resistance, heat resistance, transparency, and the like, and are used as materials for various parts in the fields of electrical and electronics, automobiles, and the like, taking advantage of these characteristics. Depending on the location where these parts are used, sliding properties may be required. In this regard, for example, polycarbonate resins made from bisphenol A alone tend to have poor sliding properties, and attempts have been made to improve sliding properties. For example, a polycarbonate resin composition (Patent Document 1) is known in which a polycarbonate resin is blended with a rubber-reinforced styrene resin and contains copolymers with specific structures in specific amounts. However, when such polycarbonate resin compositions are used as automobile parts, particularly in the environment of an automobile cabin, there arises a problem that mechanical properties such as impact resistance are reduced.

[0003] Polycarbonate-polyorganosiloxane (hereinafter sometimes abbreviated as PC-POS) copolymers are known as polycarbonate resins with excellent impact resistance and flame retardancy (see Patent Document 2). However, PC-POS copolymers tend to have inferior sliding properties compared to other polycarbonate resins, and attempts have been made to improve the sliding properties. For example, polycarbonate-polyorganosiloxane copolymers having a specific structure and a specific chain length combination, and polycarbonate-based resin compositions having specific compounds (Patent Document 3) are known, but there is still room for improvement in their sliding properties. Furthermore, PC-POS copolymers tend to be more yellow than other polycarbonate resins, so there is room for improvement in the color tone when used in automotive interiors. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-141078 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-037495 [Patent Document 3] Japanese Patent Publication No. 2020-7402 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a polycarbonate resin composition having excellent sliding properties and impact resistance and good color, and a molded article thereof. [Means for solving the problem]

[0006] The present inventors have found that a polycarbonate-based resin containing a polycarbonate-polyorganosiloxane copolymer having a specific structure, and a polycarbonate-based resin composition containing a specific compound, have excellent sliding properties and impact resistance as well as excellent color. The present invention relates to the following [1] to [8]. [1] A polycarbonate-based resin composition comprising: a polycarbonate-based resin (S) containing a polycarbonate-polyorganosiloxane copolymer (A) including a polycarbonate block (A-1) consisting of a repeating unit represented by the following general formula (I) and a polyorganosiloxane block (A-2) containing a repeating unit represented by the following general formula (II); and a copolymer (B) having a structural unit (b-1) represented by the following general formula (X1), a structural unit (b-2) represented by the following general formula (X2), and a structural unit (b-3) represented by the following general formula (X3). [ka] [ka] [In the formula, R 1 and R 2each independently represents a halogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms. X represents a single bond, an alkylene group having 1 to 8 carbon atoms, an alkylidene group having 2 to 8 carbon atoms, a cycloalkylene group having 5 to 15 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, a fluorenediyl group, an arylalkylene group having 7 to 15 carbon atoms, an arylalkylidene group having 7 to 15 carbon atoms, -S-, -SO-, -SO2-, -O-, or -CO-. R 3 and R 4 each independently represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms. a and b each independently represent an integer of 0 to 4. R 31 each independently represents a halogen atom or an alkyl group having 1 to 10 carbon atoms, and c represents an integer of 0 to 5. [2] The polycarbonate resin composition according to [1] above, wherein the structural unit (b-1) represented by the general formula (X1) constitutes a side chain of the copolymer (B). [3] The polycarbonate resin composition according to [1] or [2] above, wherein the structural unit (b-2) represented by the general formula (X2) and the structural unit (b-3) represented by the general formula (X3) constitute the main chain of the copolymer (B). [4] The polycarbonate-based resin composition according to any one of the above [1] to [3], wherein the content of the copolymer (B) is 0.5 parts by mass or more and 20 parts by mass or less per 100 parts by mass of the polycarbonate-based resin (S). [5] The polycarbonate resin composition according to any one of the above [1] to [4], further comprising a mold release agent (C). [6] The polycarbonate resin composition according to the above [5], wherein the release agent (C) is a fatty acid ester. [7] The polycarbonate resin composition according to any one of the above [1] to [6], wherein the polyorganosiloxane block (A-2) in the polycarbonate-polyorganosiloxane copolymer (A) has an average chain length of 50 or more. [8] A molded article obtained by molding the polycarbonate resin composition according to any one of the above [1] to [7]. [Effects of the Invention]

[0007] According to the present invention, it is possible to obtain a polycarbonate resin composition having excellent sliding properties and impact resistance and good color, and a molded article thereof. [Brief explanation of the drawings]

[0008] [Figure 1] Figure 1 shows a schematic diagram of the friction coefficient evaluation. [Figure 2] Figure 2 shows an example of a friction and wear test. DETAILED DESCRIPTION OF THE INVENTION

[0009] The polycarbonate resin composition of the present invention comprises a polycarbonate resin (S) containing a polycarbonate-polyorganosiloxane copolymer (A) including a polycarbonate block (A-1) composed of specific repeating units and a polyorganosiloxane block (A-2) containing specific repeating units, and a copolymer (B) having a structural unit (b-1) represented by general formula (X1), a structural unit (b-2) represented by general formula (X2), and a structural unit (b-3) represented by general formula (X3).

[0010] The polycarbonate resin composition and molded article thereof of the present invention will be described in detail below. In this specification, the preferred definitions can be adopted arbitrarily, and a combination of preferred definitions can be considered more preferred. In this specification, the expression "XX to YY" means "XX or more and YY or less."

[0011] [Polycarbonate resin composition] The polycarbonate resin composition of the present invention comprises a polycarbonate resin (S) containing a polycarbonate-polyorganosiloxane copolymer (A), and a copolymer (B) containing structural units (b-1), (b-2), and (b-3).

[0012] <Polycarbonate resin (S)> The polycarbonate resin (S) constituting the polycarbonate resin composition of the present invention contains a polycarbonate-polyorganosiloxane copolymer (A) including a polycarbonate block (A-1) consisting of repeating units represented by the following general formula (I) and a polyorganosiloxane block (A-2) containing repeating units represented by the following general formula (II):

[0013] [ka]

[0014] [In the formula, R 1 and R 2 each independently represents a halogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms. X represents a single bond, an alkylene group having 1 to 8 carbon atoms, an alkylidene group having 2 to 8 carbon atoms, a cycloalkylene group having 5 to 15 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, a fluorenediyl group, an arylalkylene group having 7 to 15 carbon atoms, an arylalkylidene group having 7 to 15 carbon atoms, -S-, -SO-, -SO2-, -O-, or -CO-. R 3 and R 4 each independently represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms. a and b each independently represent an integer of 0 to 4.]

[0015] In the above general formula (I), R 1 and R 2 The halogen atoms independently represented by each of the groups include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. R 1 and R 2 Examples of alkyl groups that R each independently represent include methyl, ethyl, n-propyl, isopropyl, various butyl groups (the term "various" includes linear and branched groups, and the same applies hereinafter in the specification), various pentyl groups, and various hexyl groups. 1 and R 2The alkoxy groups independently represented by the formula (I) include those having the above alkyl group as the alkyl group moiety.

[0016] Examples of the alkylene group represented by X include a methylene group, an ethylene group, a trimethylene group, a tetramethylene group, and a hexamethylene group, and an alkylene group having 1 to 5 carbon atoms is preferred. Examples of the alkylidene group represented by X include an ethylidene group and an isopropylidene group. Examples of the cycloalkylene group represented by X include a cyclopentanediyl group, a cyclohexanediyl group, and a cyclooctanediyl group, and an alkylene group having 5 to 10 carbon atoms is preferred. Examples of the cycloalkylidene group represented by X include a cyclohexylidene group, a 3,5,5-trimethylcyclohexylidene group, and a 2-adamantylidene group, and an alkylidene group having 5 to 10 carbon atoms is preferred, and an alkylidene group having 5 to 8 carbon atoms is more preferred. Examples of the aryl moiety of the arylalkylene group represented by X include aryl groups having 6 to 14 ring carbon atoms, such as a phenyl group, a naphthyl group, a biphenyl group, and an anthryl group, and examples of the alkylene group include the alkylenes described above. Examples of the aryl moiety of the arylalkylidene group represented by X include aryl groups having 6 to 14 ring carbon atoms, such as a phenyl group, a naphthyl group, a biphenyl group, and an anthryl group, and examples of the alkylidene group include the alkylidene groups described above.

[0017] a and b each independently represent an integer of 0 to 4, preferably 0 to 2, and more preferably 0 or 1. Among these, those in which a and b are 0 and X is a single bond or an alkylene group having 1 to 8 carbon atoms, or those in which a and b are 0 and X is an alkylene group having 3 carbon atoms, particularly an isopropylidene group, are preferred.

[0018] In the above general formula (II), R 3 or R 4 Examples of the halogen atom represented by R include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. 3 or R 4Examples of alkyl groups represented by R include methyl, ethyl, n-propyl, isopropyl, various butyl groups, various pentyl groups, and various hexyl groups. 3 or R 4 The alkoxy group represented by the formula (I) may be one in which the alkyl group moiety is the above-mentioned alkyl group. 3 or R 4 Examples of the aryl group represented by the formula (I) include a phenyl group and a naphthyl group. R 3 and R 4 are each preferably a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms, and more preferably a methyl group.

[0019] More specifically, the polyorganosiloxane block (A-2) containing the repeating unit represented by the above general formula (II) preferably has a unit represented by at least one of the following general formulas (II-I) to (II-III):

[0020] [ka]

[0021] [In the formula, R 3 ~R 6 each independently represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms, and a plurality of R 3 ~R 6 may be the same or different. Y is -R 7 O-, -R 7 COO-, -R 7 NH-, -R 7 NR 8 -, -COO-, -S-, -R 7 COO-R 9 -O- or -R 7 OR 10 The R represents —O—, and a plurality of Ys may be the same or different. 7represents a single bond, a linear, branched or cyclic alkylene group, an aryl-substituted alkylene group, a substituted or unsubstituted arylene group, or a diarylene group. 8 represents an alkyl group, an alkenyl group, an aryl group, or an aralkyl group. 9 represents a diarylene group. 10 represents a linear, branched, or cyclic alkylene group, or a diarylene group. β represents a divalent group derived from a diisocyanate compound, or a divalent group derived from a dicarboxylic acid or a dicarboxylic acid halide. n represents the average chain length of the polyorganosiloxane, and n-1, p, and q each represent the number of repeating polyorganosiloxane units and are integers of 1 or more, and the sum of p and q is n-2.]

[0022] R 3 ~R 6 The halogen atoms that each independently represent include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. 3 ~R 6 Examples of alkyl groups that R each independently represent include methyl, ethyl, n-propyl, isopropyl, various butyl groups, various pentyl groups, and various hexyl groups. 3 ~R 6 The alkoxy groups each independently represent include those in which the alkyl moiety is the above-mentioned alkyl group. 3 ~R 6 Examples of the aryl group that each independently represents include a phenyl group and a naphthyl group. R 3 ~R 6 is preferably a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms. R in general formula (II-I), (II-II) and / or (II-III) 3 ~R 6 are preferably all methyl groups.

[0023] Y indicates -R 7 O-, -R 7 COO-, -R 7NH-, -R 7 NR 8 -, -R 7 COO-R 9 -O- or -R 7 OR 10 R in -O- 7 The linear or branched alkylene group represented by R is an alkylene group having 1 to 8 carbon atoms, preferably 1 to 5 carbon atoms. 7 Examples of the cyclic alkylene group represented by include cycloalkylene groups having 5 to 15 carbon atoms, preferably 5 to 10 carbon atoms.

[0024] R 7 The aryl-substituted alkylene group represented by may have a substituent such as an alkoxy group or an alkyl group on the aromatic ring, and its specific structure can be, for example, the structure of the following general formula (i) or (ii). 7 When represents an aryl-substituted alkylene group, the alkylene group is bonded to Si.

[0025] [ka]

[0026] (wherein c represents a positive integer, and is usually an integer of 1 to 6)

[0027] R 7 , R 9 and R 10 The diarylylene group represented by the formula is a group in which two arylene groups are linked directly or via a divalent organic group, and specifically, -Ar 1 -W-Ar 2 -, where Ar 1 and Ar 2 represents an arylene group, and W represents a single bond or a divalent organic group. Examples of the divalent organic group represented by W include an isopropylidene group, a methylene group, a dimethylene group, and a trimethylene group. R 7 , Ar 1 and Ar 2Examples of the arylene group represented by the formula (I) include arylene groups having 6 to 14 ring carbon atoms, such as a phenylene group, a naphthylene group, a biphenylene group, an anthrylene group, etc. These arylene groups may have any substituent, such as an alkoxy group or an alkyl group.

[0028] R 8 The alkyl group represented by R is a straight or branched chain alkyl group having 1 to 8 carbon atoms, preferably 1 to 5 carbon atoms. 8 The alkenyl group represented by R includes straight-chain or branched-chain alkenyl groups having 2 to 8 carbon atoms, preferably 2 to 5 carbon atoms. 8 Examples of the aryl group represented by R include a phenyl group and a naphthyl group. 8 Examples of the aralkyl group represented by the formula include a phenylmethyl group and a phenylethyl group. R 10 The linear, branched or cyclic alkylene group represented by R 7 is the same as:

[0029] Y is preferably -R 7 O- and R 7 is an aryl-substituted alkylene group, and is particularly a residue of a phenolic compound having an alkyl group, and an organic residue derived from allylphenol or an organic residue derived from eugenol is more preferred. Regarding p and q in formula (II-II), it is preferable that p=q. β represents a divalent group derived from a diisocyanate compound or a divalent group derived from a dicarboxylic acid or a dicarboxylic acid halide, and examples thereof include divalent groups represented by the following general formulas (iii) to (vii).

[0030] [ka]

[0031] The average chain length n of the polyorganosiloxane block (A-2) in the PC-POS copolymer (A) is preferably 20 or more and 500 or less. The average chain length n is the average number of repetitions of the repeating unit represented by formula (II). In formulas (II-I) and (II-III), n is 20 or more and 500 or less, and in the case of (II-II), the above range is the sum of p and q plus 2. The average chain length is calculated by nuclear magnetic resonance (NMR) measurement. When the average chain length of the polycarbonate-polyorganosiloxane copolymer (A) is 20 or more and 500 or less, the final polycarbonate resin composition exhibits excellent impact resistance, sliding properties, etc., and can also exhibit excellent color.

[0032] The average chain length of the polyorganosiloxane block (A-2) is more preferably 35 or more, even more preferably 45 or more, even more preferably 50 or more, and particularly preferably 70 or more, and more preferably 300 or less, even more preferably 150 or less, and even more preferably 100 or less.

[0033] The content of the polyorganosiloxane block (A-2) in the PC-POS copolymer (A) is preferably 0.1% by mass or more and 60% by mass or less. If the amount of polyorganosiloxane in the PC-POS copolymer (A) is within the above range, a polycarbonate resin composition having better impact resistance, transparency, and color, as well as excellent sliding properties, can be obtained. The content of the polyorganosiloxane block (A-2) in the PC-POS copolymer (A) is calculated by nuclear magnetic resonance (NMR) measurement. The content of the polyorganosiloxane block (A-2) in the PC-POS copolymer (A) is more preferably 2% by mass or more, even more preferably 3% by mass or more, and particularly preferably is 4% by mass or more, more preferably 50% by mass or less, even more preferably 35% by mass or less, still more preferably 15% by mass or less, particularly preferably 10% by mass or less, and most preferably 8% by mass or less. The content of the polyorganosiloxane block (A-2) in the polycarbonate resin composition is preferably 0.1% by mass or more and 45% by mass or less. If the amount of polyorganosiloxane in the PC-POS copolymer (A) is within the above range, a polycarbonate resin composition having better impact resistance, color, and sliding properties can be obtained. The content of the polyorganosiloxane block (A-2) in the polycarbonate resin composition is calculated by nuclear magnetic resonance (NMR) measurement, similar to the content of the polyorganosiloxane block (A-2) in the PC-POS copolymer (A). The content of the polyorganosiloxane block (A-2) in the polycarbonate resin composition is more preferably 2% by mass or more, even more preferably 3% by mass or more, particularly preferably 4% by mass or more, and more preferably 35% by mass or less, even more preferably 25% by mass or less, particularly preferably 10% by mass or less, and most preferably 8% by mass or less.

[0034] The viscosity average molecular weight (Mv) of the PC-POS copolymer (A) can be adjusted appropriately by using a molecular weight modifier (terminal terminator) or the like to achieve the desired molecular weight depending on the application or product. The viscosity average molecular weight of the PC-POS copolymer (A) is preferably 9,000 or more and 50,000 or less. A viscosity average molecular weight of 9,000 or more allows for sufficient strength of the molded product. A viscosity average molecular weight of 50,000 or less allows for injection molding or extrusion molding at temperatures that do not cause thermal degradation. The viscosity average molecular weight of the PC-POS copolymer (A) is more preferably 12,000 or more, even more preferably 14,000 or more, particularly preferably 16,000 or more, and more preferably 30,000 or less, even more preferably 25,000 or less, even more preferably 23,000 or less, particularly preferably 20,000 or less.

[0035] The viscosity average molecular weight (Mv) is a value calculated from the intrinsic viscosity [η] of a methylene chloride solution at 20° C. using the Schnell formula below.

number

[0036] The PC-POS copolymer (A) can be produced by known production methods such as interfacial polymerization (phosgene method), pyridine method, and transesterification method. In particular, when interfacial polymerization is used, the process of separating an organic phase containing the PC-POS copolymer from an aqueous phase containing unreacted materials, catalyst residues, and the like is easy, and the organic phase containing the PC-POS copolymer and the aqueous phase are easily separated in each washing step, such as alkali washing, acid washing, and pure water washing. Therefore, the PC-POS copolymer can be obtained efficiently. For example, the method described in JP-A-2014-80462 can be used as a method for producing the PC-POS copolymer.

[0037] Specifically, the PC-POS copolymer (A) can be produced by dissolving a polycarbonate oligomer (described later) prepared in advance and a polyorganosiloxane in a water-insoluble organic solvent (e.g., methylene chloride), adding an aqueous alkaline solution of a dihydric phenol compound (e.g., bisphenol A) (e.g., sodium hydroxide solution), and using a tertiary amine (e.g., triethylamine) or a quaternary ammonium salt (e.g., trimethylbenzylammonium chloride) as a polymerization catalyst and carrying out an interfacial polycondensation reaction in the presence of a terminal terminator (a monohydric phenol such as p-tert-butylphenol). The PC-POS copolymer (A) can also be produced by copolymerizing a polyorganosiloxane, a dihydric phenol, and phosgene, a carbonate ester, or a chloroformate.

[0038] As the polyorganosiloxane used as a raw material, those represented by the following general formula (1), (2) and / or (3) can be used.

[0039] [ka]

[0040] In the formula, R 3 ~R 6 , Y, β, n-1, p and q are as described above, and specific examples and preferred ones are also the same. Z represents a hydrogen or halogen atom, and multiple Zs may be the same or different. For example, examples of polyorganosiloxanes represented by general formula (1) include compounds represented by the following general formulas (1-1) to (1-11).

[0041] [ka]

[0042] In the above general formulas (1-1) to (1-11), R 3 ~R 6 , n-1 and R 8 is as defined above, and the preferred values ​​are also the same. c represents a positive integer, and is usually an integer of 1 to 6. Among these, from the viewpoint of ease of polymerization of polyorganosiloxane, the phenol-modified polyorganosiloxane represented by the above general formula (1-1) is preferred.Furthermore, from the viewpoint of ease of availability, α,ω-bis[3-(o-hydroxyphenyl)propyl]polydimethylsiloxane, which is one of the compounds represented by the above general formula (1-2), and α,ω-bis[3-(4-hydroxy-3-methoxyphenyl)propyl]polydimethylsiloxane, which is one of the compounds represented by the above general formula (1-3), are preferred. Alternatively, the polyorganosiloxane raw material may be one having the following general formula (4):

[0043] [ka]

[0044] In the formula, R 3 and R 4 is the same as above. The average chain length of the polyorganosiloxane block represented by general formula (4) is (r×m), and the range of (r×m) is the same as the above-mentioned n. When the above (4) is used as the polyorganosiloxane raw material, the polyorganosiloxane block (A-2) preferably has a unit represented by the following general formula (II-IV).

[0045] [ka]

[0046] [R in the formula 3 , R 4 , r and m are as defined above]

[0047] The polyorganosiloxane block (A-2) may have a structure represented by the following general formula (II-V).

[0048] [ka]

[0049] [In the formula, R 18 ~R 21 are each independently a hydrogen atom or an alkyl group having 1 to 13 carbon atoms. 22 is an alkyl group having 1 to 6 carbon atoms, a hydrogen atom, a halogen atom, a hydroxy group, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 14 carbon atoms. 2 is a divalent aliphatic group having 1 to 10 carbon atoms. n represents the average chain length, as defined above.

[0050] In general formula (II-V), R 18 ~R 21 Examples of the alkyl group having 1 to 13 carbon atoms that each independently represents include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, various butyl groups, various pentyl groups, various hexyl groups, various heptyl groups, various octyl groups, a 2-ethylhexyl group, various nonyl groups, various decyl groups, various undecyl groups, various dodecyl groups, and various tridecyl groups. 18 ~R 21 preferably represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and more preferably represents a methyl group.

[0051] R 22 Examples of the alkyl group having 1 to 6 carbon atoms represented by R include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, various butyl groups, various pentyl groups, and various hexyl groups. 22 Examples of the halogen atom represented by R include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. 22 The alkoxy group having 1 to 6 carbon atoms represented by R is a group in which the alkyl group moiety is the above-mentioned alkyl group. 22 Examples of the aryl group having 6 to 14 carbon atoms include a phenyl group, a toluyl group, a dimethylphenyl group, and a naphthyl group. Among the above, R 22 preferably represents a hydrogen atom or an alkoxy group having 1 to 6 carbon atoms, more preferably a hydrogen atom or an alkoxy group having 1 to 3 carbon atoms, and even more preferably a hydrogen atom.

[0052] Q 2 The divalent aliphatic group having 1 to 10 carbon atoms represented by is preferably a linear or branched divalent saturated aliphatic group having 1 to 10 carbon atoms. The number of carbon atoms in the saturated aliphatic group is preferably 1 to 8, more preferably 2 to 6, even more preferably 3 to 6, and still more preferably 4 to 6. The average chain length n is as described above.

[0053] A preferred embodiment of the structural unit (II-V) is a structure represented by the following formula (II-VI).

[0054] [ka]

[0055] [wherein n-1 is as defined above.]

[0056] The polyorganosiloxane block (A-2) represented by the above general formula (II-V) or (II-VI) can be obtained by using a polyorganosiloxane raw material represented by the following general formula (5) or (6).

[0057] [ka]

[0058] [In the formula, R 18 ~R 22 , Q 2 , and n-1 are as defined above.]

[0059] [ka]

[0060] [In the formula, n-1 is as defined above.]

[0061] The method for producing the polyorganosiloxane is not particularly limited. For example, according to the method described in Japanese Patent Laid-Open No. 11-217390, cyclotrisiloxane and disiloxane are reacted in the presence of an acidic catalyst to synthesize α,ω-dihydrogenorganopentasiloxane, and then, in the presence of a hydrosilylation catalyst, the α,ω-dihydrogenorganopentasiloxane is subjected to an addition reaction with a phenolic compound (for example, 2-allylphenol, 4-allylphenol, eugenol, 2-propenylphenol, etc.), thereby obtaining a crude polyorganosiloxane. According to the method described in Japanese Patent No. 2662310, octamethylcyclotetrasiloxane and tetramethyldisiloxane are reacted in the presence of sulfuric acid (an acidic catalyst), and the resulting α,ω-dihydrogenorganopolysiloxane is then subjected to an addition reaction with a phenolic compound or the like in the presence of a hydrosilylation catalyst, as described above, to obtain a crude polyorganosiloxane. The α,ω-dihydrogenorganopolysiloxane can be used by adjusting the chain length n appropriately depending on the polymerization conditions, or commercially available α,ω-dihydrogenorganopolysiloxanes can be used. Specifically, the α,ω-dihydrogenorganopolysiloxanes described in Japanese Patent Laid-Open No. 2016-098292 can be used.

[0062] Polycarbonate oligomers can be produced by reacting a dihydric phenol with a carbonate precursor such as phosgene or triphosgene in an organic solvent such as methylene chloride, chlorobenzene, chloroform, etc. When producing polycarbonate oligomers using the transesterification method, they can also be produced by reacting a dihydric phenol with a carbonate precursor such as diphenyl carbonate. As the dihydric phenol, it is preferable to use a dihydric phenol represented by the following general formula (viii).

[0063] [ka]

[0064] In the formula, R 1 , R2 , a, b and X are as defined above.

[0065] Examples of dihydric phenols represented by the general formula (viii) include bis(hydroxyphenyl)alkanes such as 2,2-bis(4-hydroxyphenyl)propane (bisphenol A), bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, and 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane, as well as 4,4'-dihydroxydiphenyl, bis(4-hydroxyphenyl)cycloalkane, bis(4-hydroxyphenyl)oxide, bis(4-hydroxyphenyl)sulfide, bis(4-hydroxyphenyl)sulfone, bis(4-hydroxyphenyl)sulfoxide, and bis(4-hydroxyphenyl)ketone. These dihydric phenols may be used alone or in combination of two or more. Among these, bis(hydroxyphenyl)alkane dihydric phenols are preferred, and bisphenol A is more preferred. When bisphenol A is used as the dihydric phenol, the resulting copolymer is a PC-POS copolymer represented by the general formula (i) above, in which X is an isopropylidene group and a=b=0.

[0066] Examples of dihydric phenols other than bisphenol A include bis(hydroxyaryl)alkanes, bis(hydroxyaryl)cycloalkanes, dihydroxyaryl ethers, dihydroxydiaryl sulfides, dihydroxydiaryl sulfoxides, dihydroxydiaryl sulfones, dihydroxydiphenyls, dihydroxydiarylfluorenes, dihydroxydiaryladamantanes, etc. These dihydric phenols may be used alone or in combination of two or more.

[0067] Examples of bis(hydroxyaryl)alkanes include bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)octane, bis(4-hydroxyphenyl)phenylmethane, bis(4-hydroxyphenyl)diphenylmethane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, bis(4-hydroxyphenyl)naphthylmethane, 1,1-bis(4-hydroxy-3-tert-butylphenyl)propane, 2,2-bis(4-hydroxy-3-bromophenyl)propane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane, 2,2-bis(4-hydroxy-3-chlorophenyl)propane, 2,2-bis(4-hydroxy-3,5-dichlorophenyl)propane, and 2,2-bis(4-hydroxy-3,5-dibromophenyl)propane.

[0068] Examples of bis(hydroxyaryl)cycloalkanes include 1,1-bis(4-hydroxyphenyl)cyclopentane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-3,5,5-trimethylcyclohexane, 2,2-bis(4-hydroxyphenyl)norbornane, 1,1-bis(4-hydroxyphenyl)cyclododecane, etc. Examples of dihydroxyaryl ethers include 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dimethylphenyl ether, etc.

[0069] Examples of dihydroxydiaryl sulfides include 4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide, etc. Examples of dihydroxydiaryl sulfoxides include 4,4'-dihydroxydiphenyl sulfoxide, 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide, etc. Examples of dihydroxydiaryl sulfones include 4,4'-dihydroxydiphenyl sulfone, 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfone, etc.

[0070] Examples of dihydroxydiphenyls include 4,4'-dihydroxydiphenyl, etc. Examples of dihydroxydiarylfluorenes include 9,9-bis(4-hydroxyphenyl)fluorene, 9,9-bis(4-hydroxy-3-methylphenyl)fluorene, etc. Examples of dihydroxydiaryladamantanes include 1,3-bis(4-hydroxyphenyl)adamantane, 2,2-bis(4-hydroxyphenyl)adamantane, 1,3-bis(4-hydroxyphenyl)-5,7-dimethyladamantane, etc.

[0071] Examples of dihydric phenols other than those mentioned above include 4,4'-[1,3-phenylenebis(1-methylethylidene)]bisphenol, 10,10-bis(4-hydroxyphenyl)-9-anthrone, and 1,5-bis(4-hydroxyphenylthio)-2,3-dioxapentane.

[0072] To adjust the molecular weight of the resulting PC-POS copolymer, a terminal terminator (molecular weight regulator) can be used. Examples of terminal terminators include monohydric phenols such as phenol, p-cresol, p-tert-butylphenol, p-tert-octylphenol, p-cumylphenol, p-nonylphenol, m-pentadecylphenol, and p-tert-amylphenol. These monohydric phenols may be used alone or in combination of two or more.

[0073] After the interfacial polycondensation reaction, the mixture is left to stand for an appropriate time to separate into an aqueous phase and an organic solvent phase [separation step], the organic solvent phase is washed (preferably with a basic aqueous solution, an acidic aqueous solution, and water in that order) [washing step], and the resulting organic phase is concentrated [concentration step] and dried [drying step], thereby obtaining a PC-POS copolymer (A).

[0074] <Polycarbonate resin (A')> The polycarbonate resin (S) may contain a polycarbonate resin (A') other than the PC-POS copolymer (A). There are no particular restrictions on the polycarbonate resin (A'), and various known polycarbonate resins can be used. The viscosity average molecular weight (Mv) of the polycarbonate resin (A') is usually 10,000 to 50,000, preferably 13,000 to 35,000, more preferably 14,000 to 28,000, and even more preferably 16,000 to 25,000. The viscosity average molecular weight (Mv) is a value calculated by the Schnell formula, similarly to the PC-POS copolymer (A).

[0075] Specifically, the polycarbonate resin (A') may be one obtained by a conventional polycarbonate production method, such as an interfacial polymerization method in which a dihydric phenol compound and phosgene are reacted in the presence of an organic solvent inert to the reaction and an aqueous alkaline solution, followed by polymerization by adding a polymerization catalyst such as a tertiary amine or a quaternary ammonium salt, or a pyridine method in which a dihydric phenol compound is dissolved in pyridine or a mixed solution of pyridine and an inert solvent, and phosgene is introduced to produce the polycarbonate directly. During the above reaction, a molecular weight regulator (end-capping agent), a branching agent, etc. may be used, if necessary. The dihydric phenol compound may be one represented by the following general formula (III').

[0076] [ka]

[0077] [In the formula, R 1 , R 2 , X, a, and b are as defined above, and the preferred values ​​are also the same.]

[0078] Specific examples of the dihydric phenol compound include those described above in the production method of the polycarbonate-polyorganosiloxane copolymer (A), and the preferred compounds are also the same. Among them, bis(hydroxyphenyl)alkane dihydric phenols are preferred, and bisphenol A is more preferred. The polycarbonate resin (A') may be used alone or in combination of two or more. Unlike the polycarbonate-polyorganosiloxane copolymer (A), the polycarbonate resin (A') does not have the polyorganosiloxane block (A-2) represented by formula (II). For example, the polycarbonate resin (A') may be a homopolycarbonate resin, and is preferably an aromatic polycarbonate resin.

[0079] The polycarbonate resin (S) contained in the polycarbonate resin composition of the present invention may be the above-mentioned PC-POS copolymer (A) alone, or may contain the PC-POS copolymer (A) and the polycarbonate resin (A').

[0080] From the viewpoint of the impact resistance and sliding properties of the molded article, the content of the PC-POS copolymer (A) in the polycarbonate resin (S) contained in the polycarbonate resin composition is preferably 5% by mass or more, more preferably 10% by mass or more, even more preferably 30% by mass or more, still more preferably 50% by mass or more, even more preferably 60% by mass or more, still more preferably 70% by mass or more, still more preferably 80% by mass or more, still more preferably 90% by mass or more, particularly preferably 95% by mass or more, and most preferably 100% by mass (i.e., not including the polycarbonate resin (A')).

[0081] <Copolymer (B)> The copolymer (B) contained in the polycarbonate resin composition of the present invention is a copolymer having a structural unit (b-1) represented by the following general formula (X1), a structural unit (b-2) represented by the following general formula (X2), and a structural unit (b-3) represented by the following general formula (X3).

[0082] [ka]

[0083] [In the formula, R 31 each independently represents a halogen atom or an alkyl group having 1 to 10 carbon atoms, and c represents an integer of 0 to 5.

[0084] The structural unit (b-1) is represented by the above general formula (X1). In the above general formula (X1), R 31 The halogen atom represented by the formula (I) includes a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. R 31 Examples of the alkyl group having 1 to 10 carbon atoms represented by include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, various butyl groups, various pentyl groups, various hexyl groups, various heptyl groups, various octyl groups, various nonyl groups, and various decyl groups. c represents an integer of 0 to 5, preferably 0 to 3, and more preferably 0 or 1. It is particularly preferable that c=0.

[0085] The structural unit (b-2) is represented by the above general formula (X2), and the structural unit (b-3) is represented by the above general formula (X3).

[0086] The copolymer (B) is not particularly limited as long as it has the structural unit (b-1) represented by the general formula (X1) above, the structural unit (b-2) represented by the general formula (X2) above, and the structural unit (b-3) represented by the general formula (X3) above. The copolymer (B) may be either a random copolymer or a block copolymer having the structural units (b-1), (b-2), and (b-3). The copolymer (B) may also be a copolymer in which the structural units (b-1), (b-2), and (b-3) form a linear or branched main chain, or a copolymer in which one or two selected from the structural units (b-1), (b-2), and (b-3) form a main chain and at least one other structural unit forms a side chain by polymerization (e.g., graft polymerization). From the viewpoint of excellent sliding properties and hue, it is preferable that the structural unit (b-1) constitutes a side chain of the copolymer (B) and / or that the structural units (b-2) and (b-3) constitute the main chain of the copolymer (B), and it is more preferable that the structural unit (b-1) constitutes a side chain of the copolymer (B) and that the structural units (b-2) and (b-3) constitute the main chain of the copolymer (B).

[0087] In the copolymer (B), the contents of the structural unit (b-1), the structural unit (b-2), and the structural unit (b-3) in the copolymer are not particularly limited, but examples include the following embodiments. The content of the structural unit (b-1) represented by the general formula (X1) above is preferably 10% by mass or more and 50% by mass or less, relative to the total of the structural unit (b-2) represented by the general formula (X2) above and the structural unit (b-3) represented by the general formula (X3) above (100% by mass). The content of the structural unit (b-2) represented by the general formula (X2) above is preferably 80% by mass or more and 99% by mass or less, and more preferably 90% by mass or more and 97% by mass or less, relative to 100% by mass of the total of the structural unit (b-2) represented by the general formula (X2) above and the structural unit (b-3) represented by the general formula (X3) above. The content of the structural unit (b-3) represented by the general formula (X3) above is preferably 1% by mass or more and 20% by mass or less, and more preferably 3% by mass or more and 10% by mass or less, relative to 100% by mass of the total of the structural unit (b-2) represented by the general formula (X2) above and the structural unit (b-3) represented by the general formula (X3) above.

[0088] <Ethylene-vinyl acetate copolymer (B') having styrene-based (co)polymer segments> A preferred embodiment of the copolymer (B) is an ethylene-vinyl acetate copolymer (B') having a styrene-based (co)polymer segment. The ethylene-vinyl acetate copolymer (B') having a styrene-based (co)polymer segment is not limited as long as it is a copolymer consisting of a styrene-based (co)polymer portion (segment) and an ethylene-vinyl acetate copolymer portion (segment), but is preferably a graft copolymer consisting of a styrene-based (co)polymer segment and an ethylene-vinyl acetate copolymer segment. Furthermore, a graft copolymer having an ethylene-vinyl acetate copolymer segment as the main chain and a styrene-based (co)polymer segment as the side chain is preferred.

[0089] (styrene-based (co)polymer segment) The styrene-based (co)polymer segment contains the structural unit (b-1) represented by the above general formula (X1). The styrene-based (co)polymer segment is a polymer containing only the structural unit (b-1) represented by the above general formula (X1), or a copolymer containing the structural unit (b-1) represented by the above general formula (X1) and a structural unit (b-4) represented by the following general formula (X4) or the following general formula (X5).

[0090] [ka]

[0091] [In the formula, R 41 and R 43 R each independently represents a hydrogen atom or a methyl group. 42 represents an alkyl group having 1 to 8 carbon atoms or a glycidyl group.]

[0092] In the above general formula (X4), R 42 Examples of the alkyl group having 1 to 8 carbon atoms represented by include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, various butyl groups, various pentyl groups, various hexyl groups, various heptyl groups, and various octyl groups. In the above general formula (X4), R 41 is preferably a methyl group. 42 is preferably a glycidyl group. In the above general formula (X5), R 43 is preferably a methyl group.

[0093] There are no particular restrictions on the content of the structural unit (b-1) represented by the general formula (X1) above and the structural unit (b-4) represented by the general formula (X4) or the general formula (X5) above in the styrene-based (co)polymer segment, but the content of the structural unit (b-1) represented by the general formula (X1) above is preferably 50% by mass or more and 100% by mass or less, based on 100% by mass of the total of the structural unit (b-1) represented by the general formula (X1) above and the structural unit (b-4) represented by the general formula (X4) or the general formula (X5) above.

[0094] (ethylene-vinyl acetate copolymer) The ethylene-vinyl acetate copolymer is a copolymer containing the structural unit (b-2) represented by the general formula (X2) above and the structural unit (b-3) represented by the general formula (X3) above. The ethylene-vinyl acetate copolymer may be a random copolymer or a block copolymer of ethylene and vinyl acetate. The proportion of the structural unit (b-3) represented by the above general formula (X3) in the ethylene-vinyl acetate copolymer is preferably 1 to 20 mass%, more preferably 2 to 15 mass%, and even more preferably 3 to 10 mass%, relative to the total mass of the structural unit (b-2) represented by the above general formula (X2) and the structural unit (b-3) represented by the above general formula (X3).

[0095] In a preferred embodiment of the ethylene-vinyl acetate copolymer (B') having a styrene-based (co)polymer segment, the copolymer is a graft copolymer having an ethylene-vinyl acetate copolymer segment as a main chain and a styrene-based (co)polymer segment as a side chain, where the main chain refers to the longest chain structure portion in the copolymer molecule.

[0096] The ethylene-vinyl acetate copolymer (B') having a styrene-based (co)polymer segment can be produced by various known methods, including a preferred method in which a styrene-based monomer or other vinyl-based monomer and a radical-polymerizable organic peroxide are mixed into an aqueous suspension of an ethylene-vinyl acetate copolymer to which a suspending agent has been added, and the mixture is heated and stirred to impregnate the ethylene-vinyl acetate copolymer with the above components, and then the mixture is heated to polymerize.

[0097] Furthermore, the ethylene-vinyl acetate copolymer (B') having a styrene-based (co)polymer segment is commercially available, and can be selected from, for example, the "Modiper" series of products manufactured by NOF Corporation. For example, "Modiper AS100" can be mentioned.

[0098] From the viewpoint of excellent sliding properties and color (YI value) of the molded product, the content of the copolymer (B) is preferably 0.5 parts by mass or more and 20 parts by mass or less, more preferably 1 part by mass or more and 15 parts by mass or less, even more preferably 2 parts by mass or more and 10 parts by mass or less, and still more preferably 2 parts by mass or more and 7 parts by mass or less, relative to 100 parts by mass of the polycarbonate resin (S).

[0099] <Release agent (C)> The polycarbonate resin composition of the present invention may further contain a mold release agent (C) from the viewpoint of excellent sliding properties.

[0100] Examples of the release agent (C) include fatty acid esters, and more specifically, preferred examples include full esters of pentaerythritol and aliphatic carboxylic acids. The full esters of pentaerythritol and aliphatic carboxylic acids are obtained by esterifying pentaerythritol and aliphatic carboxylic acids to form full esters.

[0101] The aliphatic carboxylic acid that is a constituent of the full ester preferably has 12 to 30 carbon atoms. The aliphatic carboxylic acid can be one produced from various vegetable oils and animal fats. These oils and fats are ester compounds containing various fatty acids as components. Therefore, for example, stearic acid produced from the above-mentioned vegetable oils and animal fats usually contains a large amount of other fatty acid components such as palmitic acid. In the present invention, a mixed fatty acid containing multiple fatty acids produced from such vegetable oils and animal fats may be used, or a purified and separated fatty acid may be used. Among aliphatic carboxylic acids having 12 to 30 carbon atoms, aliphatic carboxylic acids having 12 to 22 carbon atoms are preferred. Among aliphatic carboxylic acids, it is preferred to use saturated fatty acids, and it is even more preferred to use saturated fatty acids having 12 to 22 carbon atoms. Among saturated fatty acids having 12 to 22 carbon atoms, stearic acid, palmitic acid, and behenic acid are preferred.

[0102] Specific preferred compounds of the full ester of pentaerythritol and an aliphatic carboxylic acid are pentaerythritol stearic acid full ester, pentaerythritol palmitic acid full ester, and pentaerythritol behenic acid full ester. In particular, a mixture of pentaerythritol palmitic acid full ester and pentaerythritol stearic acid full ester in a mass ratio of 9:1 to 1:9, preferably 5:5 to 3:7, is preferred from the viewpoint of compliance with the European REACH standard. For example, pentaerythritol stearic acid full ester has been widely used as a mold release agent and has already been pre-registered as an existing substance under REACH. In contrast, pentaerythritol palmitic acid full ester requires pre-registration as a new substance, but the registration costs are high and the procedures are complicated. Therefore, it is preferred to use a mixture with a high content of pentaerythritol stearic acid full ester, which can be handled as pentaerythritol stearic acid full ester. Another reason why a high composition ratio of pentaerythritol stearate full ester is preferable is that pentaerythritol stearate full ester with a carbon chain of C18 has better mold release properties when made into a resin composition than pentaerythritol palmitate full ester with a carbon chain of C16.

[0103] The content of the release agent (C) relative to 100 parts by mass of the polycarbonate resin (S) is preferably 0.10 parts by mass or more, more preferably 0.15 parts by mass or more, even more preferably 0.20 parts by mass or more, still more preferably 0.25 parts by mass or more, and is preferably 0.45 parts by mass or less, more preferably 0.40 parts by mass or less, even more preferably 0.35 parts by mass or less, and still more preferably 0.30 parts by mass or less.

[0104] <Other additives> The polycarbonate resin composition of the present invention may further contain other additives as long as the effects of the present invention are not impaired. Examples of other components include hydrolysis stabilizers, antioxidants, ultraviolet absorbers, flame retardants, flame retardant auxiliaries, reinforcing materials, fillers, impact-improving elastomers, pigments, dyes, etc. Some of the components will be described in detail below.

[0105] <Antioxidants> The polycarbonate resin composition of the present invention preferably further contains an antioxidant. By blending an antioxidant into the polycarbonate resin composition, oxidative degradation of the polycarbonate resin composition during melting can be suppressed, and coloration due to oxidative degradation can be suppressed. As the antioxidant, a phosphorus-based antioxidant and / or a phenol-based antioxidant can be suitably used.

[0106] Examples of phenolic antioxidants include hindered phenols such as n-octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 2,6-di-tert-butyl-4-methylphenol, 2,2'-methylenebis(4-methyl-6-tert-butylphenol), and pentaerythrityl-tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]. Among these antioxidants, those having a pentaerythritol diphosphite structure such as bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite and bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, and triphenylphosphine are preferred.

[0107] Examples of commercially available phenolic antioxidants include Irganox 1010 (manufactured by BASF Japan Ltd., trademark), Irganox 1076 (manufactured by BASF Japan Ltd., trademark), Irganox 1330 (manufactured by BASF Japan Ltd., trademark), Irganox 3114 (manufactured by BASF Japan Ltd., trademark), BHT (manufactured by Takeda Pharmaceutical Co., Ltd., trademark), CYANOX 1790 (manufactured by SOLVAY), and Sumilizer GA-80 (manufactured by Sumitomo Chemical Co., Ltd., trademark).

[0108] Examples of phosphorus-based antioxidants include triphenyl phosphite, diphenyl nonyl phosphite, diphenyl(2-ethylhexyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite, tris(nonylphenyl) phosphite, diphenyl isooctyl phosphite, 2,2'-methylenebis(4,6-di-tert-butylphenyl)octyl phosphite, diphenyl isodecyl phosphite, diphenyl mono(tridecyl) phosphite, phenyl diisodecyl phosphite, phenyl di(tridecyl) phosphite, tris(2-ethylhexyl) phosphite, tris(isodecyl) phosphite, tris(tridecyl) phosphite, dibutyl hydrogen phosphite, trilauryl trithiophosphite, tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenylene diphosphonite, 4,4'-isopropylidenediphenol dodecyl phosphite, sphite, 4,4'-isopropylidenediphenol tridecyl phosphite, 4,4'-isopropylidenediphenol tetradecyl phosphite, 4,4'-isopropylidenediphenol pentadecyl phosphite, 4,4'-butylidenebis(3-methyl-6-tert-butylphenyl)ditridecyl phosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl -4-methylphenyl)pentaerythritol diphosphite, bis(nonylphenyl)pentaerythritol diphosphite, distearyl-pentaerythritol diphosphite, phenyl bisphenol A pentaerythritol diphosphite, tetraphenyl dipropylene glycol diphosphite, 1,1,3-tris(2-methyl-4-di-tridecylphosphite-5-tert-butylphenyl)butane, 3,4,5,6-dibenzo-1,Examples of such phosphine include 2-oxaphosphine, triphenylphosphine, diphenylbutylphosphine, diphenyloctadecylphosphine, tris(p-tolyl)phosphine, tris(p-nonylphenyl)phosphine, tris(naphthyl)phosphine, diphenyl(hydroxymethyl)phosphine, diphenyl(acetoxymethyl)phosphine, diphenyl(β-ethylcarboxyethyl)phosphine, tris(p-chlorophenyl)phosphine, tris(p-fluorophenyl)phosphine, benzyldiphenylphosphine, diphenyl(β-cyanoethyl)phosphine, diphenyl(p-hydroxyphenyl)phosphine, diphenyl(1,4-dihydroxyphenyl)-2-phosphine, and phenylnaphthylbenzylphosphine.

[0109] Examples of commercially available phosphorus-based antioxidants include Irgafos 168 (manufactured by BASF Japan Ltd., trademark), Irgafos 12 (manufactured by BASF Japan Ltd., trademark), Irgafos 38 (manufactured by BASF Japan Ltd., trademark), ADK STAB 2112 (manufactured by ADEKA Corporation, trademark), ADK STAB C (manufactured by ADEKA Corporation, trademark), ADK STAB 329K (manufactured by ADEKA Corporation, trademark), ADK STAB PEP36 (manufactured by ADEKA Corporation, trademark), JC-263 (manufactured by Johoku Chemical Industry Co., Ltd., trademark), Sandstab P-EPQ (manufactured by Clariant), and Doverphos S-9228PC (manufactured by Dover Chemical Co., trademark).

[0110] The antioxidants can be used alone or in combination of two or more. The amount of antioxidant in the polycarbonate resin composition of the present invention is preferably 0.001 to 0.5 parts by mass, preferably 0.01 to 0.3 parts by mass, more preferably 0.05 to 0.3 parts by mass, per 100 parts by mass of the polycarbonate resin (S). When the amount of antioxidant per 100 parts by mass of the polycarbonate resin (S) is within the above range, sufficient antioxidant effect can be obtained and mold contamination during molding can be suppressed.

[0111] The polycarbonate resin composition of the present invention has the above-mentioned composition, and thus can exhibit excellent sliding properties and impact resistance as well as excellent color. The term "slidability" refers to the smooth movement of contacting and / or movable parts of an article. Slidability can be evaluated, for example, by the coefficient of dynamic friction and the coefficient of static friction. In this specification, good hue means little yellowness. The hue can be evaluated, for example, by the YI value.

[0112] In one embodiment of the polycarbonate resin composition of the present invention, the total content of the polycarbonate resin (S) and the copolymer (B) is, based on 100% by mass of the total amount of the polycarbonate resin composition, preferably 80% by mass or more and 100% by mass or less, more preferably 95% by mass or more and 100% by mass or less, even more preferably 97% by mass or more and 100% by mass or less, still more preferably 98% by mass or more and 100% by mass or less, and particularly preferably 99% by mass or more and 100% by mass or less. In another embodiment of the polycarbonate resin composition of the present invention, the total content of the polycarbonate resin (S), the copolymer (B), and the other components is preferably 90% by mass or more and 100% by mass or less, more preferably 95% by mass or more and 100% by mass or less, even more preferably 97% by mass or more and 100% by mass or less, still more preferably 98% by mass or more and 100% by mass or less, and particularly preferably 99% by mass or more and 100% by mass or less, based on 100% by mass of the total amount of the polycarbonate resin composition. In the polycarbonate resin composition of the present invention, the content of the polycarbonate resin (S) is preferably 65% ​​by mass or more and 99.5% by mass or less, more preferably 80% by mass or more and 99% by mass or less, even more preferably 85% by mass or more and 98% by mass or less, and still more preferably 90% by mass or more and 98% by mass or less, based on 100% by mass of the total amount of the polycarbonate resin composition. In the polycarbonate resin composition of the present invention, the content of the PC-POS copolymer (A) is preferably 20% by mass or more and 99.5% by mass or less, more preferably 40% by mass or more and 99% by mass or less, even more preferably 60% by mass or more and 98% by mass or less, and still more preferably 80% by mass or more and 98% by mass or less, based on 100% by mass of the total amount of the polycarbonate resin composition. In the polycarbonate resin composition of the present invention, the content of copolymer (B) is preferably 0.4% by mass or more and 20% by mass or less, more preferably 1% by mass or more and 15% by mass or less, even more preferably 1.5% by mass or more and 10% by mass or less, and still more preferably 2% by mass or more and 10% by mass or less, based on 100% by mass of the total amount of the polycarbonate resin composition.

[0113] [Method for producing polycarbonate resin composition] The polycarbonate resin composition of the present invention can be obtained by blending and kneading the above-mentioned components in the above-mentioned proportions, and further various optional components, which are used as needed, in appropriate proportions.

[0114] The blending and kneading can be carried out by premixing using commonly used equipment such as a ribbon blender or drum tumbler, followed by using a Henschel mixer, Banbury mixer, single-screw extruder, twin-screw extruder, multi-screw extruder, co-kneader, etc. The heating temperature during kneading is usually selected appropriately from the range of 240° C. to 320° C. For this melt kneading, it is preferable to use an extruder, particularly a vented extruder.

[0115] [Molded body] Using the melt-kneaded polycarbonate resin composition of the present invention or the obtained pellets as a raw material, various molded articles can be produced by injection molding, injection compression molding, extrusion molding, blow molding, press molding, vacuum molding, foam molding, etc. In particular, the pellets obtained by melt-kneading can be suitably used to produce injection-molded articles by injection molding and injection compression molding. Molded articles made from the polycarbonate resin composition of the present invention can be suitably used, for example, as exterior and internal parts of electric and electronic equipment components for televisions, radios, cameras, video cameras, audio players, DVD players, air conditioners, mobile phones, smartphones, transceivers, displays, computers, tablet terminals, portable game devices, stationary game devices, wearable electronic devices, cash registers, calculators, copiers, printers, facsimiles, communication base stations, batteries, robots, etc., as well as exterior and internal parts of automobiles, railways, ships, aircraft, space industry equipment, medical equipment, and building material parts. [Example]

[0116] The present invention will be explained in more detail with reference to examples, but the present invention is not limited to these examples. The characteristic values ​​and evaluation results in each example were determined according to the following procedures.

[0117] (1) Polydimethylsiloxane chain length and content It was calculated from the integral ratio of the methyl groups of polydimethylsiloxane by NMR measurement. In this specification, polydimethylsiloxane may be abbreviated as PDMS. <Method for determining the chain length of polydimethylsiloxane> 1 H-NMR measurement conditions NMR device: JEOL RESONANCE ECA-500 Probe: 50TH5AT / FG2 Observation range: -5 to 15 ppm Observation center: 5 ppm Pulse repetition time: 9 seconds Pulse width: 45° NMR sample tube: 5φ Sample amount: 30-40mg Solvent: deuterated chloroform Measurement temperature: room temperature Number of times accumulated: 256 In the case of allylphenol-terminated polydimethylsiloxane A: The integral value of the methyl group of the dimethylsiloxane part observed around δ-0.02 to 0.5 B: Integral value of methylene group of allylphenol observed around δ2.50-2.75 Polydimethylsiloxane chain length = (A / 6) / (B / 4) In the case of eugenol-terminated polydimethylsiloxane A: The integral value of the methyl group of the dimethylsiloxane part observed around δ-0.02 to 0.5 B: Integral value of methylene group of eugenol observed around δ2.40-2.70 Polydimethylsiloxane chain length = (A / 6) / (B / 4) <Method for quantifying polydimethylsiloxane content> Quantitative method for determining the amount of polydimethylsiloxane copolymerized in PTBP-terminated polycarbonate copolymerized with allylphenol-terminated polydimethylsiloxane NMR device: JEOL RESONANCE ECA-500 Probe: 50TH5AT / FG2 Observation range: -5 to 15 ppm Observation center: 5 ppm Pulse repetition time: 9 seconds Pulse width: 45° Number of times accumulated: 256 NMR sample tube: 5φ Sample amount: 30-40mg Solvent: deuterated chloroform Measurement temperature: room temperature A: Integral value of the methyl group of the BPA part observed around δ1.5-1.9 B: The integral value of the methyl group of the dimethylsiloxane part observed around δ-0.02 to 0.3 C: Integral value of the butyl group in the p-tert-butylphenyl moiety observed around δ1.2-1.4 a=A / 6 b=B / 6 c=C / 9 T=a+b+c f=a / T×100 g=b / T×100 h=c / T×100 TW=f×254+g×74.1+h×149 PDMS (mass%)=g×74.1 / TW×100

[0118] (2) Viscosity average molecular weight The viscosity average molecular weight (Mv) was calculated by the following formula (Schnell formula) using the intrinsic viscosity [η] obtained by measuring the viscosity of a methylene chloride solution at 20° C. using an Ubbelohde viscometer.

[0119]

number

[0120] (3) Friction coefficient evaluation The coefficient of friction between test pieces was evaluated using a sliding slope measuring instrument (AN, manufactured by Toyo Seiki Seisakusho Co., Ltd.) by the slope method, in which the slope angle of the slope plate is gradually increased and the static friction coefficient is calculated from the angle at which the test piece begins to slide. The test pieces were kept under the following measurement conditions for 24 hours or more before being used for the test. Figure 1 shows a schematic diagram of the friction coefficient evaluation. The upper test piece was attached to a weight (sled), and the lower test piece was attached to an inclined plate with double-sided tape (Sumitomo 3M Limited, transparent double-sided tape Cat. No. 665-3-12) at two points on both sides of the test piece. The test pieces were also set to face the flow direction (MD). The inclination angle θ of the inclined plate was measured when the sliding distance of the upper test piece reached 10 mm.

[0121]

number

[0122] In this evaluation, the measured value of θ is substituted into the above formula (Moran's law), and the calculated result is used as the static friction coefficient μ S The smaller the static friction coefficient, the smaller the friction and the better the material. The static friction coefficient was measured five times and the average value was calculated. [Measurement conditions] Upper test piece shape: length 70mm, width 100mm, thickness 3.0mm Lower test piece: same material (common material), length 150mm, width 150mm, thickness 3.0mm Change rate of tilt angle of inclined plate: 2.7° / s Thread cross section: 65cm 2 (i.e., interfacial pressure 15g / cm 2 ) Sled weight: 1.0kg Measurement direction: MD direction Number of measurements: 5 Measurement temperature: 23±1℃, relative humidity 50±5% Measurement conditions: No lubrication.

[0123] (4) Friction and wear evaluation Using a constant load measuring machine (HEIDON TYPE-40, manufactured by Shinto Scientific Co., Ltd.), the upper rectangular test piece was fixed to a vice jig so that the surface cut with a gate cutter (manufactured by Dumbbell Co., Ltd.) was in contact with the lower flat test piece, and the lower flat test piece was fixed to the side of the machine, after which the two were installed so that they were perpendicular to each other. On the return trip of the 200th back and forth sliding, the maximum values ​​of the friction coefficient were calculated in the range of 240.5 to 241 seconds in descending order. M1 , μ M2 , μ M3 Let μ M1 , μ M2 , μ M3 The local minimum value immediately after μ m1 , μ m2 , μ m3 An example is shown in Figure 2. Maximum friction coefficient μ M and Δμ were calculated using the following formulas, and the results, rounded to two decimal places, are shown in Table 3. Maximum friction coefficient μ M =(μ M1 +μ M2 +μ M3 ) / 3 Friction coefficient μ after stick-slip m =(μ m1 +μ m2 +μ m3 ) / 3 Δμ=μ M -μm [Measurement conditions] Upper strip test piece shape: length 40mm, width 10mm, thickness 4.0mm Lower plate specimen shape: same material (common material), length 80 mm, width 80 mm, thickness 3.0 mm Load condition: 500g Measurement speed: 500mm / min Measurement length: 10 mm Number of round trips: 200.

[0124] (5) Abnormal noise evaluation The generation of abnormal noise during the above friction and wear test was measured using a sound level meter (DT-805L, manufactured by SHENZHEN EVERBEST MACHINERY INDUSTRY CO., LTD.). The sound level meter, fixed to a clamp with a base, was brought 10 mm close to the strip test piece fixed to the upper vice jig and measurements were taken. The maximum sound level (dB) during the measurement is shown as the result. [Measurement conditions] Response speed: FAST Range: Low.

[0125] (6) Performance evaluation

[0126] <Impact resistance evaluation> (Charpy impact strength) Using the evaluation pellets obtained in each Example, Comparative Example, and Reference Example, a 4 mm thick molded body was molded under the following conditions in accordance with JIS K 6719-2:2011, and test specimens in accordance with JIS K 7139:2009 were prepared from the molded body. Using the prepared test specimens, the Charpy impact strength was measured at temperatures of 23°C and -40°C in accordance with JIS K 7111-1:2012. (Molding conditions) Pellets drying: 120℃, 5 hours Injection molding machine: EC100SX (Toshiba Machine Co., Ltd.) Cylinder temperature: 280℃ Test piece shape: length 80±2mm, width 10±0.2mm

[0127] <Hue evaluation> (YI value) The evaluation pellets obtained in each Example, Comparative Example, and Reference Example were injection molded using an injection molding machine (MD50XB, manufactured by Niigata Machine Techno Co., Ltd.) at a cylinder temperature of 280°C, a mold temperature of 80°C, and a cycle time of 40 seconds to form flat plate-shaped test pieces measuring 50 x 30 x 3 m thick. The YI value of the obtained test piece was measured five times by the reflection method using a spectrophotometer under the conditions of C light source, 2-degree visual field, and measurement hole: 30 mmφ, and the average value was calculated. In Examples 1 to 6, Comparative Examples 1 to 3, and Reference Examples 1 to 3, the spectrophotometer used was an SE2000 (manufactured by Nippon Denshoku Industries Co., Ltd.).In Examples 7 to 11 and Comparative Examples 4 to 6, the spectrophotometer used was an SE7700 (manufactured by Nippon Denshoku Industries Co., Ltd.).

[0128] <Production Example 1: Production of Polycarbonate Oligomer> Sodium dithionite was added to a 5.6% by mass aqueous solution of sodium hydroxide at a concentration of 2000 ppm relative to bisphenol A (BPA) (to be dissolved later). BPA was then dissolved in the solution to a BPA concentration of 13.5% by mass, thereby preparing an aqueous sodium hydroxide solution of BPA. The resulting sodium hydroxide solution of BPA was continuously passed through a tubular reactor with an internal diameter of 6 mm and a length of 30 m at flow rates of 40 L / hr, methylene chloride at 15 L / hr, and phosgene at 4.0 kg / hr. The tubular reactor had a jacket, and cooling water was passed through the jacket to maintain the temperature of the reaction solution below 40 °C. The reaction solution leaving the tubular reactor was continuously introduced into a 40 L baffled tank reactor equipped with a swept-back blade, to which was added a sodium hydroxide solution of BPA at 2.8 L / hr, a 25% by weight sodium hydroxide solution at 0.07 L / hr, water at 17 L / hr, and a 1% by weight triethylamine solution at 0.64 L / hr. The reaction solution overflowing from the tank reactor was continuously withdrawn and allowed to settle, allowing the aqueous phase to be separated and removed, and the methylene chloride phase to be collected. The polycarbonate oligomer thus obtained had a concentration of 341 g / L and a chloroformate group concentration of 0.71 mol / L.

[0129] <Polycarbonate-polyorganosiloxane copolymer (A1)> A 50 L tank-type reactor equipped with a baffle, paddle-type stirring blades, and a cooling jacket was charged with 15 L of the polycarbonate oligomer solution produced in Production Example 1 above, 10.1 L of methylene chloride, 407 g of o-allylphenol-terminated polydimethylsiloxane (PDMS) in which the average chain length n of the polydimethylsiloxane was 37, and 8.4 mL of triethylamine. To this was added, with stirring, 1065 g of an aqueous sodium hydroxide solution prepared by dissolving 85 g of sodium hydroxide in 980 mL of pure water, and the polycarbonate oligomer and allylphenol-terminated PDMS were reacted for 20 minutes. To this polymerization solution, a methylene chloride solution of p-tert-butylphenol (PTBP) (147 g of PTBP dissolved in 1.0 L of methylene chloride) and an aqueous sodium hydroxide solution of bisphenol A (1093 g of bisphenol A dissolved in an aqueous solution of 618 g of sodium hydroxide and 2.1 g of sodium dithionite dissolved in 9.0 L of pure water) were added, and the polymerization reaction was carried out for 40 minutes. After adding 13 L of methylene chloride for dilution and stirring for 20 minutes, the mixture was separated into an organic phase containing polycarbonate-polydimethylsiloxane copolymer (PC-PDMS copolymer) and an aqueous phase containing excess bisphenol A and sodium hydroxide, and the organic phase was isolated. The methylene chloride solution of the PC-PDMS copolymer thus obtained was washed successively with a 15% by volume aqueous solution of 0.03 mol / L sodium hydroxide and 0.2 mol / L hydrochloric acid, and then repeatedly with pure water until the electrical conductivity of the aqueous phase after washing fell to 5 μS / cm or less. The methylene chloride solution of the PC-PDMS copolymer obtained by washing was concentrated and pulverized, and the resulting flakes were dried at 120°C under reduced pressure to produce PC-PDMS copolymer (A1). The content of PDMS block moieties in the obtained PC-PDMS copolymer (A1) determined by NMR was 6.0% by mass, and the viscosity average molecular weight Mv was 17,700.

[0130] <Polycarbonate-polyorganosiloxane copolymer (A2)> PC-PDMS copolymer (A2) was produced in the same manner as the polycarbonate-polyorganosiloxane copolymer (A1) above, except that an o-allylphenol-terminated modified PDMS with an average polydimethylsiloxane chain length n of 88 was used. The content of PDMS block moieties in the obtained PC-PDMS copolymer (A2) determined by nuclear magnetic resonance (NMR) was 6.0% by mass, and the viscosity average molecular weight Mv was 17,700.

[0131] <Polycarbonate resin (A')> Aromatic homopolycarbonate resin [Idemitsu Kosan Co., Ltd., Toughlon FN1700 (product name), viscosity average molecular weight = 17,700]

[0132] <Copolymer (B)> "Modiper AS100 (product name)" [manufactured by NOF Corporation]

[0133] <Release agent (C)> A mixture of pentaerythritol stearate and pentaerythritol palmitate (mixing ratio: C16:C18 = 1:1.1) [Riken Vitamin Co., Ltd., EW440A] <Other ingredients> Antioxidant: "IRGAFOS168 (trade name)" [tris(2,4-di-tert-butylphenyl)phosphite, manufactured by BASF Japan Ltd.]

[0134] Examples 1 to 6, Comparative Examples 1 to 3, Reference Examples 1 to 3 The PC-POS copolymer (A1) or (A2), the ethylene-vinyl acetate copolymer (B) having a styrene-based (co)polymer segment, the release agent (C), and the antioxidant were mixed in the proportions shown in Tables 1 and 2, and the mixture was fed into a vented twin-screw extruder (Toshiba Machine Co., Ltd., TEM35B) and melt-kneaded at a screw rotation speed of 250 rpm, a discharge rate of 25 kg / hr, and a resin temperature of 280°C to obtain pellet samples for evaluation. The evaluation pellet sample was dried at 120°C for 5 hours and then injection-molded using an injection molding machine (Toshiba Machine Co., Ltd., IS150E-5A) at a cylinder temperature of 280°C and a mold temperature of 80°C to produce two flat test specimens (150 mm long, 150 mm wide, 3 mm thick) for friction coefficient evaluation. One specimen was used as the lower test specimen. The other specimen was then cut using a contour machine (YS Kogyo Co., Ltd., Vz-300), and burrs on the cut surface were removed with sandpaper to produce an upper test specimen (70 mm long, 100 mm wide, 3 mm thick). The results of the friction coefficient test, impact properties and color evaluation are shown in Tables 1 and 2.

[0135] [Table 1]

[0136] [Table 2]

[0137] Examples 7 to 11, Comparative Examples 4 to 7 The PC-POS copolymer (A1) or (A2), the ethylene-vinyl acetate copolymer (B) having a styrene-based (co)polymer segment, the release agent (C), and the antioxidant were mixed in the proportions shown in Table 3, and the mixture was fed into a vented twin-screw extruder (TEM35B, manufactured by Toshiba Machine Co., Ltd.) and melt-kneaded at a screw rotation speed of 250 rpm, a discharge rate of 25 kg / hr, and a resin temperature of 280°C to obtain a pellet sample for evaluation. This pellet sample for evaluation was dried at 120 ° C. for 5 hours, and then injection molded using an injection molding machine (Toshiba Machine Co., Ltd., EC100SX) at a cylinder temperature of 280 ° C. and a mold temperature of 80 ° C. to produce a dumbbell-shaped tensile test piece (Type A) in accordance with JIS K 7139:2009 and ISO 20753:2008. Then, using a gate cutter (manufactured by Dumbbell Co., Ltd.) set at 88 ° C., it was cut into a strip shape (length 80 mm, width 10 mm, thickness 4 mm), and cut in half using a contour machine (manufactured by YS Kogyo Co., Ltd., Vz-300). After that, the surface cut by the gate cutter was deburred with a razor or the like to produce a strip test piece (length 40 mm, width 10 mm, thickness 4 mm) used as the upper test piece for friction and wear evaluation. Furthermore, the above-mentioned evaluation pellet sample was dried at 120°C for 5 hours, and then injection molded using an injection molding machine (NEX110, manufactured by Nissei Plastic Industrial Co., Ltd.) at a cylinder temperature of 280°C and a mold temperature of 80°C to prepare a flat plate test piece (length 80 mm, width 80 mm, thickness 3 mm) to be used as the lower test piece for friction and wear evaluation. It should be noted that Examples 7 to 11 and Comparative Examples 4 to 7 were carried out independently of Examples 1 to 6, Comparative Examples 1 to 3, and Reference Examples 1 to 3 described above. Table 3 shows the results of the evaluation of friction and wear, abnormal noise, impact properties and color.

[0138] [Table 3] [Industrial Applicability]

[0139] According to the present invention, it is possible to obtain a polycarbonate resin composition and a molded article thereof which have improved sliding properties and excellent color without impairing the excellent impact resistance of polycarbonate resins. The molded article obtained by the present invention has excellent sliding properties, and therefore, can suppress, for example, creaking noise.

Claims

1. A polycarbonate-based resin composition comprising: a polycarbonate-based resin (S) containing a polycarbonate-polyorganosiloxane copolymer (A) that includes a polycarbonate block (A-1) composed of repeating units represented by the following general formula (I) and a polyorganosiloxane block (A-2) that includes repeating units represented by the following general formula (II), wherein the polyorganosiloxane block (A-2) has an average chain length of 20 or more and 100 or less; and a copolymer (B) having a structural unit (b-1) represented by the following general formula (X1), a structural unit (b-2) represented by the following general formula (X2), and a structural unit (b-3) represented by the following general formula (X3). 【Chemistry 1】 【Chemistry 2】 [In the formula, R 1 and R 2 each independently represents a halogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms. X represents a single bond, an alkylene group having 1 to 8 carbon atoms, an alkylidene group having 2 to 8 carbon atoms, a cycloalkylene group having 5 to 15 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, a fluorenediyl group, an arylalkylene group having 7 to 15 carbon atoms, an arylalkylidene group having 7 to 15 carbon atoms, -S-, -SO-, -SO 2 represents -, -O- or -CO-. 3 and R 4 each independently represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms. a and b each independently represent an integer of 0 to 4. R 31 each independently represents a halogen atom or an alkyl group having 1 to 10 carbon atoms, and c represents an integer of 0 to 5.

2. 2. The polycarbonate resin composition according to claim 1, wherein the structural unit (b-1) represented by general formula (X1) constitutes a side chain of the copolymer (B).

3. The polycarbonate resin composition according to claim 1 or 2, wherein the structural unit (b-2) represented by general formula (X2) and the structural unit (b-3) represented by general formula (X3) constitute the main chain of the copolymer (B).

4. 4. The polycarbonate-based resin composition according to claim 1, wherein the content of the copolymer (B) is 0.5 parts by mass or more and 20 parts by mass or less per 100 parts by mass of the polycarbonate-based resin (S).

5. The polycarbonate resin composition according to any one of claims 1 to 4, further comprising a mold release agent (C).

6. 6. The polycarbonate resin composition according to claim 5, wherein the release agent (C) is a fatty acid ester.

7. 7. The polycarbonate resin composition according to claim 1, wherein the polyorganosiloxane block (A-2) in the polycarbonate-polyorganosiloxane copolymer (A) has an average chain length of 50 or more.

8. A molded article obtained by molding the polycarbonate resin composition according to any one of claims 1 to 7.

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