Polycarbonate resin composition

Abstract

This invention relates to a polycarbonate-based resin composition comprising a polycarbonate-based resin (S) and having a specific viscosity-average molecular weight Mv. PC, the aforementioned polycarbonate resin (S) includes a polycarbonate-organosiloxane copolymer (S-1) and an aromatic polycarbonate resin (S-2) other than the aforementioned polycarbonate-organosiloxane copolymer (S-1). The aforementioned polycarbonate-organosiloxane copolymer (S-1) includes polycarbonate blocks (A-1) containing repeating units with a specific structure and a specific amount of repeating units and having a specific average chain length (A-2). Viscosity average molecular weight (Mv) of polycarbonate resin (S) Viscosity average molecular weight Mv of PC and polycarbonate-polyorganosiloxane copolymer (S-1) The difference between Si and Mv Si-Mv PC is -3, 100 or higher and 6,000 or lower.

Description

Polycarbonate resin composition This invention relates to a polycarbonate resin composition and its molded form. Polycarbonate-polyorganosiloxane copolymers (hereinafter sometimes simply referred to as "PC-POS copolymers") have attracted attention due to their excellent properties such as high impact resistance, chemical resistance, and flame retardancy. Therefore, they are expected to be widely used in various fields such as electrical / electronic machinery and automobiles. They are particularly widely used in housings for mobile phones, personal computers, digital cameras, camcorders, power tools, and other everyday items. Typically, homopolymer polycarbonate is used as a representative polycarbonate, which is a diphenol using 2,2-bis(4-hydroxyphenyl)propane [commonly known as bisphenol A] as a raw material. To improve the flame retardancy and impact resistance of this homopolymer polycarbonate, polycarbonate-polyorganosiloxane copolymers using polyorganosiloxanes as comonomers are known (Patent Document 1). When seeking to improve the impact resistance of polycarbonate resin compositions, particularly at low temperatures, methods using polyorganosiloxanes with longer chain lengths, as disclosed in Patent Document 2, are known. However, this method suffers from reduced transparency. Conversely, to further improve the transparency of polycarbonate resin compositions, methods using polyorganosiloxanes with relatively shorter chain lengths are known (see Patent Documents 3 and 4). However, these methods also suffer from reduced impact resistance. In Patent Document 5, although an attempt was made to maintain excellent impact resistance and improve transparency by blending two polycarbonate-polyorganosiloxane copolymers with different light transmittances, the resulting transparency is not considered sufficient. (Prior Art Documents, Patent Documents) Patent Document 1: Japanese Patent No. 2662310; Patent Document 2: Japanese Patent Application Publication No. 2012-246430; Patent Document 3: Japanese Patent Application Publication No. Hei 8-81620; Patent Document 4: Japanese Patent Application Publication No. 2011-46911; Patent Document 5: Japanese Patent Application Publication No. 2006-523243. [The problem the invention aims to solve] Regarding polycarbonate resin compositions, it is difficult to simultaneously achieve excellent transparency and excellent impact resistance, especially at low temperatures. Particularly when the viscosity-average molecular weight of the PC-POS copolymer is relatively high, the inventors believe that further improvements are necessary to achieve a balance between excellent transparency and excellent impact resistance. The object of this invention is to provide a polycarbonate resin composition comprising a PC-POS copolymer with a relatively high viscosity-average molecular weight, and a molded article thereof, exhibiting excellent transparency and impact resistance. [Technical Means for Solving the Problem] The inventors have discovered that the above-mentioned problems can be solved by combining a polycarbonate resin composition obtained by combining a PC-POS copolymer with a specific viscosity average molecular weight and an aromatic polycarbonate resin other than the PC-POS copolymer with a specific viscosity average molecular weight. That is, the present invention relates to the following [1] to

[12] . [1] A polycarbonate resin composition comprising a polycarbonate resin (S), the polycarbonate resin (S) comprising a polycarbonate-polyorganosiloxane copolymer (S-1) and an aromatic polycarbonate resin (S-2) other than the polycarbonate-polyorganosiloxane copolymer (S-1), the polycarbonate-polyorganosiloxane copolymer (S-1) comprising a polycarbonate block (A-1) containing 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), the polycarbonate resin (S) having a viscosity average molecular weight Mv PC The content of polyorganosiloxane blocks (A-2) in the polycarbonate-polyorganosiloxane copolymer (S-1) is between 0.5% and 9% by mass, with an average chain length n of 20 or more but less than 60. The viscosity of the polycarbonate resin (S) is between 20,000 and 30,000. PC Viscosity-average molecular weight Mv of polycarbonate-polyorganosiloxane copolymer (S-1) Si The difference Mv Si -Mv PC The range is -3,100 to 6,000. [Chemistry 1] [In the formula, R] 1 and R 2 Each of these can independently represent 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 alkyl group having 1 to 8 carbon atoms, an alkylene group having 2 to 8 carbon atoms, an alkylene group having 5 to 15 carbon atoms, an alkylene group having 5 to 15 carbon atoms, an alkylene group having 5 to 15 carbon atoms, an alkylene group having 7 to 15 carbon atoms, -S-, -SO-, -SO 2-, -O-, or -CO-; R 3 and R 4Each of the following 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 independently represent integers from 0 to 4. [2] The polycarbonate resin composition described in [1] above, wherein the viscosity average molecular weight Mv of the polycarbonate resin (S) is... PC Viscosity-average molecular weight Mv of polycarbonate-polyorganosiloxane copolymer (S-1) Si The difference Mv Si -Mv PC The viscosity is between -1,500 and 6,000. [3] The polycarbonate resin composition described in [2] above, wherein the viscosity average molecular weight Mv of the polycarbonate resin (S) is between -1,500 and 6,000. PC Viscosity-average molecular weight Mv of polycarbonate-polyorganosiloxane copolymer (S-1) Si The difference Mv Si -Mv PC The viscosity average molecular weight is -500 to 6,000. [4] The polycarbonate resin composition described in any of [1] to [3] above, wherein the polycarbonate-polyorganosiloxane copolymer (S-1) has a viscosity average molecular weight Mv. Si The content is 18,500 to 25,000. [5] The polycarbonate resin composition described in any one of [1] to [4] above, wherein the content of the polyorganosiloxane block (A-2) in the polycarbonate-polyorganosiloxane copolymer (S-1) is 0.5% by mass to 8% by mass. [6] The polycarbonate resin composition described in any one of [1] to [5] above, wherein the polyorganosiloxane block (A-2) is a block unit represented by any one of the following general formulas (II-I), (II-II) and (II-III). [Chemistry 2] [In the formula, R] 3 ~R 6 Each of the following can independently represent 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 atoms. 3 ~R 6 They can be the same or different; Y represents -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 -O-, multiple Ys can be the same or different from each other; the above R 7 Represents a single bond, straight chain, branched chain, or cyclic alkyl group, aryl-substituted alkyl group, substituted or unsubstituted aryl group, or diaryl group; R 8 Indicates alkyl, alkenyl, aryl, or aralkyl; R 9 Indicates diaryl aryl; R 10 [7] The polycarbonate resin composition described in any of [1] to [6] above, wherein the haze value measured according to ISO 14782:1999 in a molded body with a thickness of 3 mm is 0.1 to 1.0 or less. [8] The polycarbonate resin composition described in any of [1] to [7] above, wherein the polycarbonate-polyorganosiloxane copolymer (S-1) substantially does not contain the block unit (A-3) represented by the following general formula (IV). [Chemistry 3] [In the formula, R] 21 ~R 24 Each is independently composed of 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; R 25 It is an alkyl group having 1 to 6 carbon atoms, a hydrogen atom, a halogen atom, a hydroxyl group, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 14 carbon atoms; Q 2[9] The polycarbonate resin composition described in any of [1] to [8] above, wherein the polycarbonate-polyorganosiloxane copolymer (S-1) is composed only of polycarbonate blocks (A-1) and polyorganosiloxane blocks (A-2).

[10] The polycarbonate resin composition described in any of [1] to [9] above, wherein the average chain length n of the polyorganosiloxane block (A-2) is greater than 30 and less than 60.

[11] The polycarbonate resin composition described in any of [1] to

[10] above, wherein the average molecular weight of the aromatic polycarbonate resin (S-2) is 11,000 or more and 30,000 or less.

[12] A molded article obtained by molding a polycarbonate-based resin composition as described in any one of [1] to

[11] above. [Effects of the Invention] According to the present invention, a polycarbonate resin composition comprising a PC-POS copolymer with a relatively high viscosity-average molecular weight and excellent transparency and impact resistance, and the molded article thereof, can be provided. The polycarbonate-based resin composition of the present invention comprises a polycarbonate-based resin (S), which comprises a polycarbonate-organosiloxane copolymer (S-1) and an aromatic polycarbonate-based resin (S-2) other than the polycarbonate-organosiloxane copolymer (S-1). The polycarbonate-organosiloxane copolymer (S-1) comprises a polycarbonate block (A-1) containing specific repeating units and a polyorganosiloxane block (A-2) containing specific repeating units. The viscosity-average molecular weight Mv of the polycarbonate-organosiloxane copolymer (S-1) is... Si The content of polyorganosiloxane blocks (A-2) in the polycarbonate-polyorganosiloxane copolymer (S-1) is between 0.5% and 9.0% by mass, the average chain length n of the polyorganosiloxane blocks (A-2) is 20 or more but less than 60, and the average molecular weight Mv of the polycarbonate resin (S) is between 20,000 and 30,000. PC Viscosity-average molecular weight Mv of polycarbonate-polyorganosiloxane copolymer (S-1) Si The difference Mv Si -Mv PC The range is -3,100 to 6,000. The polycarbonate resin composition and its molded articles of the present invention will now be described in detail. In this specification, preferred definitions may be used arbitrarily, and combinations of preferred components may be even more preferred. In this specification, the designation "XX~YY" means "XX or more, YY or less". [Polycarbonate Resin Composition] The polycarbonate resin composition of the present invention comprises a polycarbonate resin (S), which includes a polycarbonate-organosiloxane copolymer (S-1) and an aromatic polycarbonate resin (S-2) other than the polycarbonate-organosiloxane copolymer (S-1). <Polycarbonate Resin (S)> The polycarbonate resin (S) constituting the polycarbonate resin composition of the present invention comprises a polycarbonate-organosiloxane copolymer (S-1) and an aromatic polycarbonate resin (S-2) other than the polycarbonate-organosiloxane copolymer (S-1). The polycarbonate-organosiloxane copolymer (S-1) comprises a polycarbonate block (A-1) containing 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). The viscosity-average molecular weight Mv of the polycarbonate-organosiloxane copolymer (S-1) is... Si The content of polyorganosiloxane blocks (A-2) in the polycarbonate-polyorganosiloxane copolymer (S-1) is between 0.5% and 9.0% by mass, the average chain length n of the polyorganosiloxane blocks (A-2) is 20 or more but less than 60, and the average molecular weight Mv of the polycarbonate resin (S) is between 20,000 and 30,000. PC Viscosity-average molecular weight Mv of polycarbonate-polyorganosiloxane copolymer (S-1) Si The difference Mv Si -Mv PC The range is -3,100 to 6,000. [Chemistry 4] [In the formula, R] 1 and R 2 Each of these can independently represent 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 alkyl group having 1 to 8 carbon atoms, an alkylene group having 2 to 8 carbon atoms, an alkylene group having 5 to 15 carbon atoms, an alkylene group having 5 to 15 carbon atoms, an alkylene group having 5 to 15 carbon atoms, an alkylene group having 7 to 15 carbon atoms, -S-, -SO-, -SO 2-, -O-, or -CO-; R 3 and R 4 Each of the following can be independently represented: 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 can be independently represented: integers from 0 to 4. (Polycarbonate-Polyorganosiloxane Copolymer (S-1)) The polycarbonate-polyorganosiloxane copolymer (S-1) comprises a polycarbonate block (A-1) containing repeating units represented by the above general formula (I) and a polyorganosiloxane block (A-2) containing repeating units represented by the above general formula (II). The content of the polyorganosiloxane block (A-2) in the polycarbonate-polyorganosiloxane copolymer (S-1) is 0.5% by mass or more and 9.0% by mass or less, and the average chain length n of the polyorganosiloxane block (A-2) is 20 or more and less than 60. Hereinafter, the polycarbonate-polyorganosiloxane copolymer (S-1) is sometimes simply referred to as "PC-POS copolymer (S-1)". • Polycarbonate block (A-1) In the above general formula (I), as R 1 and R 2 Halogen atoms, represented independently, can be exemplified by fluorine, chlorine, bromine, and iodine atoms. As R... 1 and R 2 Alkyl groups, individually and independently represented, can be exemplified by methyl, ethyl, n-propyl, isopropyl, various butyl groups (the term "various" means including both straight-chain and all branched groups, as will be stated in the specification below), various pentyl groups, and various hexyl groups. As R 1 and R 2 Alkoxy groups, which are represented independently, can be exemplified by those having the aforementioned alkyl group as the alkyl site. Examples of alkyl groups represented by X include methylene, ethyl, trimethylene, tetramethylene, and hexamethylene, with alkyl groups having 1 to 5 carbon atoms being preferred. Examples of alkylene groups represented by X include ethylene and isopropylene. Examples of cycloalkyl groups represented by X include cyclopentadiyl or cyclohexadiyl, and cyclooctadiyl, with cycloalkyl groups having 5 to 10 carbon atoms being preferred. Examples of cyclohexene groups represented by X include cyclohexene, 3,5,5-trimethylcyclohexene, and 2-adamantyl, with cycloalkyl groups having 5 to 10 carbon atoms being preferred, and cycloalkyl groups having 5 to 8 carbon atoms being more preferred. Examples of aryl alkyl groups represented by X include phenyl, naphthyl, biphenyl, and anthracene, which form cyclic carbons having 6 to 14 carbon atoms, with the above-mentioned alkyl groups being examples of alkyl groups. Examples of aryl groups with 6 to 14 carbon atoms in a cyclic alkylene group, such as phenyl, naphthyl, biphenyl, and anthracene, can be used as examples of alkylene groups. a and b each independently represent an integer from 0 to 4, preferably from 0 to 2, and more preferably 0 or 1. Among them, it is suitable that a and b are 0 and X is a single bond or an alkylene group having 1 to 8 carbon atoms, or that a and b are 0 and X is an alkylene group having 3 carbon atoms, especially an isopropylene group. The polycarbonate block (A-1) is preferably composed of repeating units represented by the above general formula (I). • Polyorganosiloxane Block (A-2) The polyorganosiloxane block (A-2) is a structural unit located on the main chain of the PC-POS copolymer (S-1) between the two closest polycarbonate bonds, and contains at least one repeating unit represented by the above general formula (II). In the above general formula (II), as R... 3 or R 4 Examples of halogen atoms that can be represented include fluorine, chlorine, bromine, and iodine atoms. As R 3 or R 4 Examples of alkyl groups represented include methyl, ethyl, n-propyl, isopropyl, various butyl, various pentyl, and various hexyl groups. As R 3 or R 4 The alkoxy group represented can be exemplified by cases where the alkyl group is one of the aforementioned alkyl groups. As R 3 or R 4 Examples of aryl groups that can be represented include phenyl and naphthyl groups. R 3 and R 4Preferably, the atom is 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; more preferably, all of them are methyl. The average chain length n of the polyorganosiloxane block (A-2) contained in the PC-POS copolymer (S-1) is 20 or more and less than 60, preferably 20 or more and less than 55, more preferably 25 or more and less than 50, and even more preferably greater than 30 and less than 43. If the average chain length is within the above range, a polycarbonate resin composition with superior transparency and impact resistance, especially at low temperatures, can be obtained. Furthermore, in a preferred embodiment, the PC-POS copolymer (S-1) substantially does not contain block units derived from polyorganosiloxanes with an average chain length of 60 or more as polyorganosiloxane blocks (A-2). Moreover, the average chain length of the polyorganosiloxane block (A-2) refers to the -SiR group contained in the polyorganosiloxane block (A-2) located between the two closest polycarbonate bonds on the main chain of the PC-POS copolymer (S-1). 3 R 4 - The average number of groups. Furthermore, the number of repeating units represented by the above general formula (II) contained in the polyorganosiloxane block (A-2) is n-1. The average chain length n of the polyorganosiloxane block (A-2) contained in the PC-POS copolymer (S-1) was calculated by nuclear magnetic resonance (NMR) measurement. The content (also referred to as the amount of polyorganosiloxane) in the PC-POS copolymer (S-1) is 0.5% by mass or more and 9% by mass or less. If the amount of polyorganosiloxane in the PC-POS copolymer (S-1) is within the above range, a polycarbonate resin composition with excellent transparency and impact resistance can be obtained. The content of the polyorganosiloxane block (A-2) in the PC-POS copolymer (S-1) is preferably 0.5% by mass or more and 8% by mass or less, more preferably 0.5% by mass or more and less than 8% by mass, further preferably 2% by mass or more and 7.5% by mass or less, further preferably 4% by mass or more and 7% by mass or less, and most preferably 5% by mass or more and 7% by mass or less. In this specification, "the content of polyorganosiloxane blocks (A-2) in the PC-POS copolymer (S-1)" refers to the percentage of the mass of the above general formula (II) relative to the total mass of the polycarbonate block (A-1), the above general formula (II), and the end structure derived from the PC-POS copolymer (S-1) including, as needed, the end-capping agent described later. The same applies to "the content of polyorganosiloxane blocks (A-2) in the polycarbonate resin (S)" and "the content of polyorganosiloxane blocks (A-2) in the polycarbonate resin composition." The content of polyorganosiloxane blocks (A-2) in the PC-POS copolymer (S-1) is calculated by nuclear magnetic resonance (NMR) determination. Specifically, [the following is a description of the process]. 1 The H-NMR determination is calculated from the integral values ​​of the peak derived from formula (I), the peak derived from formula (II), and the peak derived from the terminal group. The preferred form of the polyorganosiloxane block (A-2) containing the repeating unit represented by the above general formula (II) is the block unit represented by any one of the following general formulas (II-I) to (II-III). [Chemistry 5] [In the formula, R] 3 ~R 6 Each of the following can independently represent 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 atoms. 3 ~R 6 They can be the same or different; Y represents -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 -O-, multiple Ys can be the same or different from each other; the above R 7 Represents a single bond, straight chain, branched chain, or cyclic alkyl group, aryl-substituted alkyl group, substituted or unsubstituted aryl group, or diaryl group; R 8 Indicates alkyl, alkenyl, aryl, or aralkyl; R 9 Indicates diaryl aryl; R 10 [This indicates a straight-chain, branched, or cyclic alkyl group, or a diaryl group; β indicates a divalent group derived from a diisocyanate compound, or a divalent group derived from a dicarboxylic acid or a dicarboxylic acid halide; n is as described above; p is an integer greater than 1 and less than n-2] As R 3 ~R 6 Halogen atoms, represented independently, can be exemplified by fluorine, chlorine, bromine, and iodine atoms. As R... 3 ~R 6 Alkyl groups, individually and independently represented, can be exemplified by methyl, ethyl, n-propyl, isopropyl, various butyl, various pentyl, and various hexyl groups. As R 3 ~R 6 The alkoxy groups, represented independently, can be exemplified by cases where the alkyl group is one of the aforementioned alkyl groups. As R 3 ~R 6 Aryl groups, which can be represented independently, include phenyl and naphthyl groups. As R 3 ~R 6 Preferably, the atom is 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. Preferably, R is a molecule in general formulas (II-I), (II-II), and / or (II-III). 3 ~R 6 All are methyl groups. -R represented by Y 7 O-, -R 7 COO-, -R 7 NH-, -R 7 NR 8 -, -R 7 COO-R 9 -O-, or -R 7 O-R 10 In -O-, R 7 is bonded to the Si atom. In -COO- represented by Y, the C atom is bonded to the Si atom. As -R represented by Y 7 O-, -R 7 COO-, -R 7 NH-, -R 7 NR 8 -, -R 7 COO-R 9 -O-, or -R 7 O-R 10 R in -O- 7 The straight-chain or branched-chain alkylene group represented by can be exemplified by an alkylene group having 1 to 8 carbon atoms, preferably 1 to 5 carbon atoms. As R 7 The cyclic alkylene group represented by can be exemplified by a cycloalkylene group having 5 to 15 carbon atoms, preferably 5 to 10 carbon atoms. As R 7 The aryl-substituted alkylene group represented by may have substituents such as alkoxy groups and alkyl groups on the aromatic ring. As its specific structure, for example, the structures of the following general formula (i) or (ii) can be exemplified. Here, for R 7When representing aryl-substituted alkyl groups, the alkyl group is bonded to the Si atom. In aryl-substituted alkyl groups, the -R represented by Y... 7 O-、-R 7 COO-、-R 7 NH-, -R 7 NR 8 -、-R 7 COO-R 9 -O- or -R 7 OR 10 In -O-, the aryl group is bonded to R. 7 The adjacent oxygen, carbon, or nitrogen atom. [Chemistry 6] [In the formula, c represents a positive integer, usually an integer from 1 to 6] R 7 R 9 and R 10 The term "aryl" refers to a group formed by the direct or transvalent linkage of two aryl groups, specifically those with -Ar groups. 1 -W-Ar 2 - The basis of the structure represented. Here, Ar 1 and Ar 2 The symbol represents an aryl group, and W represents a single bond or a divalent organogroup. Examples of divalent organogroups represented by W include isopropylidene, methylene, dimethylene, and trimethylene. As R... 7 Ar 1 and Ar 2 Examples of aryl groups include aryl groups with 6 to 14 carbon atoms forming a ring, such as arylphenyl, arylnaphthyl, biarylphenyl, and arylanthryl. These aryl groups may also have any substituents such as alkoxy or alkyl groups. As R 8The alkyl group referred to is a straight-chain or branched group having 1 to 8 carbon atoms, preferably 1 to 5. As R 8 The alkenyl group can be represented by examples of straight-chain or branched groups having 2 to 8 carbon atoms, preferably 2 to 5. As R 8 Examples of aryl groups include phenyl and naphthyl groups. As R 8 Aryl groups can be represented by examples such as phenylmethyl and phenylethyl. 10 The straight-chain, branched, or cyclic alkyl groups and R 7 same. As for Y, it is better to be -R 7 O-, and R 7 It is an aryl-substituted alkyl group. Wherein, R... 7 More preferably, it is a residue of a phenolic compound, especially an alkyl group, and even more preferably an organic residue derived from allylphenol or an organic residue derived from eugenol. Furthermore, regarding p in formula (II-II), it is more preferably p = n - p - 2. β represents a divalent group derived from a diisocyanate compound or a divalent group derived from a dicarboxylic acid or a halide of a dicarboxylic acid, for example, the divalent groups represented by the following general formulas (iii) to (vii). [Chemistry 7] For example, as a block unit represented by the following general formula (II-I), block units of the following general formulas (II-I-1) to (II-I-11) can be cited. [Chemistry 8] In the above general formulas (II-I-1) to (II-I-11), R 3 ~R 6 n-1 and R 8 As described above, the preferred alternatives are also the same. c represents a positive integer, typically an integer from 1 to 6. Among these, from the viewpoint of ease of polymerization of polyorganosiloxanes, the block unit represented by the above general formula (II-I-1) is preferred. Furthermore, from the viewpoint of ease of acquisition, the block unit represented by the above general formula (II-I-2) and the block unit represented by the above general formula (II-I-3) are preferred. In addition, as other preferred forms of polyorganosiloxane blocks (A-2), block units represented by the following general formulas (II-IV) can be cited as examples. [Chemistry 9] [R in the formula] 3 and R 4 Same as above; r×m is equal to n above] The average chain length of the polyorganosiloxane block represented by general formula (II-IV) is (r×m), and the range of (r×m) is the same as that of n above. From the viewpoint of transparency and impact resistance at low temperatures, the PC-POS copolymer (S-1), in its preferred state as a polyorganosiloxane block (A-2), substantially does not contain the block unit (A-3) represented by the following general formula (IV). [Chemistry 10] [In the formula, R] 21 ~R 24 Each is independently composed of 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; R 25 It is an alkyl group having 1 to 6 carbon atoms, a hydrogen atom, a halogen atom, a hydroxyl group, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 14 carbon atoms; Q 2 [A divalent aliphatic group with 1 to 10 carbon atoms; m represents the average chain length and is an integer greater than or equal to 10] As R 21 ~R 24 Halogen atoms, represented independently, can be exemplified by fluorine, chlorine, bromine, and iodine atoms. As R... 21 ~R 24 Alkyl groups, individually and independently represented, can be exemplified by methyl, ethyl, n-propyl, isopropyl, various butyl, various pentyl, and various hexyl groups. As R 21 ~R 24 The alkoxy groups, represented independently, can be exemplified by cases where the alkyl group is one of the aforementioned alkyl groups. As R 21 ~R 24 Aryl groups, which can be represented independently, include phenyl and naphthyl groups, among others. As R 25 Alkyl groups having 1 to 6 carbon atoms can be exemplified by methyl, ethyl, n-propyl, isopropyl, various butyl groups, various pentyl groups, and various hexyl groups. As R 25 Examples of halogen atoms that can be represented include fluorine, chlorine, bromine, and iodine atoms. As R... 25 The alkoxy group representing 1 to 6 carbon atoms can be exemplified by cases where the alkyl group is one of the aforementioned alkyl groups. As R 25 Aryl groups representing 6 to 14 carbon atoms can be exemplified by phenyl, toluene, dimethylphenyl, and naphthyl. As Q 2 The divalent aliphatic group representing 1 to 10 carbon atoms is preferably a straight-chain or branched divalent saturated aliphatic group with 1 to 10 carbon atoms. The saturated aliphatic group preferably has 1 to 8 carbon atoms, more preferably 2 to 6 carbon atoms, further preferably 3 to 6 carbon atoms, and even more preferably 4 to 6 carbon atoms. m is the average chain length and is an integer greater than or equal to 10. As a specific example of the repeating unit (A-3), the structure represented by the following formula (IV-I) can be cited. [Chemistry 11] [Where, m is as described above] In the preferred embodiment of the PC-POS copolymer (S-1), the main chain of the PC-POS copolymer (S-1) consists only of polycarbonate blocks (A-1), polyorganosiloxane blocks (A-2), and end structures derived from end capping agents described below, which may be added as needed. The viscosity-average molecular weight (Mv) of the polycarbonate-polyorganosiloxane copolymer (S-1) is preferably 18,500 to 25,000, more preferably 20,000 to 25,000, further preferably 20,000 to 24,000, and even more preferably 21,000 to 23,500. Si Within the aforementioned range, polycarbonate resin compositions exhibiting superior transparency and impact resistance, particularly at low temperatures, can be obtained. The viscosity-average molecular weight (Mv) of the PC-POS copolymer (S-1) can be appropriately adjusted to the target molecular weight by using molecular weight regulators (end-capping agents), etc., depending on the intended application or product. The viscosity-average molecular weight (Mv) is the value calculated from the limiting viscosity [η] of a dichloromethane solution at 20°C, according to the following Schnell formula. [Number 1] • Method for Manufacturing Polycarbonate-Polyorganosiloxane Copolymer (S-1) The aforementioned PC-POS copolymer (S-1) can be manufactured using known methods such as interfacial polymerization (phosgene method), pyridine method, and transesterification method. In particular, when using interfacial polymerization, it is easy to separate the organic phase containing the PC-POS copolymer from the aqueous phase containing unreacted substances or catalyst residues, and it is easy to separate the organic phase containing the PC-POS copolymer from the aqueous phase in various washing steps such as alkaline washing, acid washing, and pure water washing. Therefore, the PC-POS copolymer can be obtained with high efficiency. As a method for manufacturing the PC-POS copolymer, for example, the method described in Japanese Patent Application Publication No. 2014-80462 can be referred to. In interfacial polymerization (phosgene process), for example, a polycarbonate oligomer is pre-prepared by polymerizing a diphenolic compound with a carbonate precursor such as phosgene, and then the polycarbonate oligomer, a polyorganosiloxane, and a diphenolic compound as needed are polymerized to produce a PC-POS copolymer (S-1). Specifically, it can be produced by dissolving the pre-prepared polycarbonate oligomer and polyorganosiloxane in a non-water-soluble organic solvent (such as dichloromethane), adding an aqueous solution of an alkaline compound (such as sodium hydroxide solution) containing a diphenolic compound (such as bisphenol A), using a tertiary amine (such as triethylamine) or a quaternary ammonium salt (such as trimethylbenzylammonium chloride) as a polymerization catalyst, and carrying out an interfacial polycondensation reaction in the presence of an end-capping agent (such as a monophenol such as p-tert-butylphenol). Furthermore, PC-POS copolymers (S-1) can also be manufactured, for example, by copolymerizing polyorganosiloxanes, diphenolic compounds, and phosgene, carbonates, or chloroformates. Polyorganosiloxanes used as raw materials can be those shown in the following general formulas (1), (2) and / or (3). [Chemistry 12] [In the formula, R] 3 ~R 6 [Y, β, n, and p as described above] R 3 ~R 6 Specific examples and preferred embodiments of Y, β, n and p are as described above. Z represents a hydrogen atom or a halogen atom, and multiple Zs may be the same or different from each other. For example, as a polyorganosiloxane represented by general formula (1), compounds of the following general formulas (1-1) to (1-11) can be cited. [Chemistry 13] In the above general formulas (1-1) to (1-11), R 3 ~R 6n-1 and R 8 As above, the preferred alternatives are also the same. c represents a positive integer, typically an integer from 1 to 6. Of these, from the viewpoint of ease of polymerization of the polyorganosiloxane, the phenol-modified polyorganosiloxane represented by the above general formula (1-1) is preferred. Furthermore, from the viewpoint of ease of acquisition, 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. In addition, polyorganosiloxane raw materials can also be those with the following general formula (4). [Chemistry 14] [In the formula, R] 3 R 4 [r and m are the same as above] The polyorganosiloxane used as a raw material is preferably not a polyorganosiloxane represented by the following general formula (5) or (6). [Chemistry 15] [In the formula, R] 21 ~R 25 Q 2 [and m are the same as above] [Chemistry 16] [In the formula, m is the same as above] The manufacturing method of the aforementioned polyorganosiloxanes is not particularly limited. For example, according to the method described in Japanese Patent Application Publication No. 11-217390, a cyclotrisiloxane and a disiloxane are reacted in the presence of an acidic catalyst to synthesize an α,ω-dihydroorganopentasiloxane. Then, in the presence of a catalyst for hydrosilylation, the α,ω-dihydroorganopentasiloxane is subjected to an addition reaction with phenolic compounds (such as 2-allylphenol, 4-allylphenol, eugenol, 2-propenylphenol, etc.) to obtain a crude polyorganosiloxane. Furthermore, according to the method described in Japanese Patent No. 2662310, octamethylcyclotetrasiloxane and tetramethyldisiloxane are reacted in the presence of sulfuric acid (acidic catalyst), and the resulting α,ω-dihydroorganopolysiloxane undergoes an addition reaction with phenolic compounds in the presence of a hydrosilylation catalyst, thereby obtaining crude organopolysiloxane. Moreover, the α,ω-dihydroorganopolysiloxane can be used by appropriately adjusting its chain length n through polymerization conditions, and commercially available α,ω-dihydroorganopolysiloxanes can also be used. Specifically, the one described in Japanese Patent Application Publication No. 2016-098292 can be used. Polycarbonate oligomers can be produced by reacting a diphenolic compound with a carbonate precursor such as phosgene or triphosgene in an organic solvent such as dichloromethane, chlorobenzene, or chloroform. When producing polycarbonate oligomers using the transesterification method, they can also be produced by reacting a diphenolic compound with a carbonate precursor such as diphenyl carbonate. Preferably, the diphenolic compound is represented by the following general formula (viii). [Chemistry 17] In the formula, R 1 R 2 a, b, and X are as described above. Examples of diphenolic compounds represented by the above general formula (viii) include: 2,2-bis(4-hydroxyphenyl)propane [bisphenol A], bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane, 4,4'-dihydroxybiphenyl, bis(4-hydroxyphenyl)cycloalkanes, bis(4-hydroxyphenyl)oxides, bis(4-hydroxyphenyl)sulfides, bis(4-hydroxyphenyl) sulfides, bis(4-hydroxyphenyl) sulfides, bis(4-hydroxyphenyl) sulfides, bis(4-hydroxyphenyl) ketones, etc. These diphenolic compounds can be used alone or in mixtures of two or more. Among these, bis(hydroxyphenyl) alkane diphenols are preferred, and bisphenol A is more preferred. When bisphenol A is used as a diphenol compound, in the above general formula (i), it becomes a PC-POS copolymer in which X is isopropylidene and a = b = 0. Examples of diphenolic compounds other than bisphenol A include: bis(hydroxyaryl)alkanes, bis(hydroxyaryl)cycloalkanes, dihydroxyaryl ethers, dihydroxydiaryl sulfides, dihydroxydiaryl sulfides, dihydroxydiaryl sulfides, dihydroxybiphenyls, dihydroxydiaryl benzoates, and dihydroxydiaryl benzoates. These diphenolic compounds can be used alone or in mixtures of two or more. 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, 2,2-bis(4-hydroxy-3,5-dichlorophenyl)propane, 2,2-bis(4-hydroxy-3,5-dibromophenyl)propane, etc. 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)norphine, and 1,1-bis(4-hydroxyphenyl)cyclododecane. Examples of dihydroxyaryl ethers include: 4,4'-dihydroxydiphenyl ether and 4,4'-dihydroxy-3,3'-dimethylphenyl ether. Examples of dihydroxy diaryl sulfides include 4,4'-dihydroxy diphenyl sulfide and 4,4'-dihydroxy-3,3'-dimethyl diphenyl sulfide. Examples of dihydroxy diaryl sulfides include 4,4'-dihydroxy diphenyl sulfide and 4,4'-dihydroxy-3,3'-dimethyl diphenyl sulfide. Examples of dihydroxy diaryl sulfides include 4,4'-dihydroxy diphenyl sulfide and 4,4'-dihydroxy-3,3'-dimethyl diphenyl sulfide. Examples of dihydroxybiphenyl derivatives include 4,4'-dihydroxybiphenyl. Examples of dihydroxydiaryl benzoyl derivatives include 9,9-bis(4-hydroxyphenyl)benzoyl, 9,9-bis(4-hydroxy-3-methylphenyl)benzoyl. Examples of dihydroxydiaryl benzoyl derivatives include 1,3-bis(4-hydroxyphenyl)adamantane, 2,2-bis(4-hydroxyphenyl)adamantane, 1,3-bis(4-hydroxyphenyl)-5,7-dimethyladamantane. Examples of diphenolic compounds other than those mentioned above include 4,4'-[1,3-epoxyphenylbis(1-methylethylidene)]bisphenol, 10,10-bis(4-hydroxyphenyl)-9-anthrone, and 1,5-bis(4-hydroxyphenylthio)-2,3-dioxolane. To adjust the molecular weight of the obtained PC-POS copolymer, an end-capping agent (molecular weight regulator) can be used. Examples of end-capping agents include monohydric phenols such as phenol, p-cresol, p-tert-butylphenol, p-tert-octylphenol, p-isopropylphenylphenol, p-nonylphenol, m-pentadecanol, and p-tert-pentylphenol. These monohydric phenols can be used alone or in combination of two or more. After the above-mentioned interfacial polycondensation reaction, the mixture is allowed to stand for an appropriate period of time to separate into an aqueous phase and an organic solvent phase [separation step]. The organic solvent phase is then washed (preferably in the order of alkaline aqueous solution, acidic aqueous solution, and water) [washing step]. The obtained organic phase is then concentrated [concentration step] and dried [drying step], thereby obtaining the PC-POS copolymer (S-1). (Aromatic Polycarbonate Resin (S-2)) The polycarbonate resin (S) further includes aromatic polycarbonate resin (S-2) other than PC-POS copolymer (S-1). The main chain of the aromatic polycarbonate resin (S-2) has repeating units represented by the following general formula (III). Various known polycarbonate resins can be used as the above-mentioned polycarbonate resin without particular limitation. One aromatic polycarbonate resin can be used alone, or two or more can be used in combination. Furthermore, the aromatic polycarbonate resin (S-2) is different from PC-POS copolymer (S-1) in that it does not have the structure of polyorganosiloxane blocks represented by formula (II). For example, the aromatic polycarbonate resin (S-2) is preferably a homopolymer polycarbonate resin, and more preferably a homopolymer polycarbonate resin whose main chain substantially only has repeating units represented by the following general formula (III). [Chemistry 18] [In the formula, R] 9 and R 10 Each of these can independently represent 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 alkyl group having 1 to 8 carbon atoms, an alkylene group having 2 to 8 carbon atoms, an alkylene group having 5 to 15 carbon atoms, an alkylene group having 5 to 15 carbon atoms, -S-, -SO-, -SO 2-, -O- or -CO-; d and e independently represent integers from 0 to 4. As R 9 and R 10Specific examples can be given in relation to the above R. 1 and R 2 Those that are the same, and those that are better, are also the same. As for R... 9 and R 10 More preferably, it is an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms. As a specific example of X', the same as X described above can be given, and the same is also preferred. d and e are each independently preferably 0 to 2, more preferably 0 or 1. • Physical properties of the aromatic polycarbonate resin (S-2): The viscosity-average molecular weight of the aromatic polycarbonate resin (S-2) is preferably 11,000 to 30,000, more preferably 13,500 to 26,000, and even more preferably 16,000 to 24,000. If the viscosity-average molecular weight is within the above range, a polycarbonate resin composition with superior transparency and impact resistance, especially at low temperatures, can be obtained. • Manufacturing Method of Aromatic Polycarbonate Resin (S-2) Aromatic polycarbonate resin (S-2) can be obtained by previous polycarbonate manufacturing methods, such as: interfacial polymerization, in the presence of an inert organic solvent or alkaline aqueous solution, where a diphenolic compound is reacted with phosgene, followed by the addition of a polymerization catalyst such as a tertiary amine or quaternary ammonium salt; melt polymerization (transesterification), in which a diol and a diester are subjected to transesterification in a molten state without the use of a solvent, with the addition of an alkaline catalyst; and pyridine method, in which a diphenolic compound is dissolved in pyridine or a mixture of pyridine and an inert solvent, and phosgene is introduced for direct manufacturing. When carrying out the above reactions, molecular weight regulators (end-capping agents), branching agents, etc., may be used as needed. Furthermore, the above-mentioned diphenolic compounds are compounds having two phenolic hydroxyl groups within the molecule, such as those represented by the following general formula (III'). [Chemistry 19] [In the formula, R] 9 R 10 X', d, and e are as defined above, and the preferred ones are the same. As a specific example of this diphenolic compound, the one described above by the PC-POS(S-1) manufacturing method can be cited, and the same applies to preferred embodiments. Among these, bis(hydroxyphenyl)alkane diphenols are preferred, and bisphenol A is even more preferred. (Physical properties of polycarbonate resin (S)) Viscosity and average molecular weight (Mv) of polycarbonate resin (S) PCThe value is between 20,000 and 30,000. If the viscosity average molecular weight (Mv) is... PC Within the aforementioned range, a polycarbonate resin composition exhibiting excellent transparency and impact resistance, and consequently chemical resistance, can be obtained. The viscosity-average molecular weight (Mv) of the polycarbonate resin (S) PC Preferably, the value is between 20,000 and 27,000; more preferably, it is between 20,000 and 25,000; even more preferably, it is between 20,000 and 22,000; and even more preferably, it is between 21,000 and 22,000. Since polycarbonate resin (S) includes PC-POS (S-1) and aromatic polycarbonate resin (S-2) other than the PC-POS copolymer (S-1), the viscosity-average molecular weight Mv of polycarbonate resin (S) is... PC Viscosity average molecular weight Mv of PC-POS copolymer (S-1) Si They may not be consistent and sometimes differ. The viscosity-average molecular weight (Mv) of polycarbonate resins (S) PC Viscosity average molecular weight Mv of PC-POS copolymer (S-1) Si The difference Mv Si -Mv PC For values ​​between -3,100 and 6,000. If Mv Si -Mv PC Within the aforementioned range, a polycarbonate-based resin composition exhibiting excellent transparency and impact resistance can be obtained. The viscosity-average molecular weight (Mv) of the polycarbonate-based resin (S) PC Viscosity average molecular weight Mv of PC-POS copolymer (S-1) Si The difference Mv Si -Mv PC Preferably, the value is between -1,500 and 6,000; more preferably, between -500 and 6,000; further preferably, between -500 and 4,000; and most preferably, between -500 and 3,000. If Mv Si -Mv PCWithin the aforementioned range, polycarbonate resin compositions with superior transparency and impact resistance, especially at low temperatures, and consequently chemical resistance, can be obtained. The content of the polyorganosiloxane block (A-2) in the polycarbonate resin (S) is preferably 0.5% by mass or more and not more than 8% by mass, more preferably 1% by mass or more and not more than 6% by mass, further preferably 2.7% by mass or more and not more than 5% by mass, and even more preferably 3.1% by mass or more and not more than 5% by mass. If the content of the polyorganosiloxane block (A-2) in the polycarbonate resin (S) is within the above range, a polycarbonate resin composition with superior transparency and impact resistance, especially impact resistance at low temperatures, can be obtained. The content of the polyorganosiloxane block (A-2) in the polycarbonate resin (S) is calculated by nuclear magnetic resonance (NMR) measurement, in the same manner as the content of the polyorganosiloxane block (A-2) in the PC-POS copolymer (S-1) described above. Viscosity average molecular weight (Mv) of polycarbonate resin (S) PC The content of the polyorganosiloxane block (A-2) in the polycarbonate resin (S) can be adjusted, for example, by the ratio of the PC-POS copolymer (S-1) to the aromatic polycarbonate resin (S-2). The content of the PC-POS copolymer (S-1) in the polycarbonate resin (S) is preferably 5% by mass or more and 99% by mass, more preferably 15% by mass or more and 90% by mass, further preferably 30% by mass or more and 80% by mass, further preferably 40% by mass or more and 70% by mass, and particularly preferably 50% by mass or more and 70% by mass. The content of aromatic polycarbonate resin (S-2) in the polycarbonate resin (S) is preferably 1% by mass or more and 95% by mass, more preferably 10% by mass or more and 85% by mass, further preferably 20% by mass or more and 70% by mass, further preferably 30% by mass or more and 60% by mass, and even more preferably 30% by mass or more and 50% by mass. <Other Additives> The polycarbonate resin composition of the present invention may contain other additives without impairing the effects of the present invention. Examples of other components include hydrolysis resistant agents, antioxidants, ultraviolet absorbers, flame retardants, flame retardant additives, reinforcing materials, fillers, and impact-modifying elastomers, pigments, and dyes. <Antioxidants> Antioxidants can be cited as a specific example of other additives. By incorporating antioxidants into polycarbonate resin compositions, oxidative degradation during the melting process of the polycarbonate resin composition can be inhibited, and coloring caused by oxidative degradation can be suppressed. Phosphorus-based antioxidants and / or phenolic antioxidants are suitable as antioxidants. Examples of phenolic antioxidants include 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 hindered phenols such as pentaerythritol tetra[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 or triphenylphosphine, are preferred. Commercially available phenolic antioxidants include, for example: Irganox 1010 (manufactured by BASF JAPAN Co., Ltd., trade name), Irganox 1076 (manufactured by BASF JAPAN Co., Ltd., trademark), Irganox 1330 (manufactured by BASF JAPAN Co., Ltd., trade name), Irganox 3114 (manufactured by BASF JAPAN Co., Ltd., trade name), BHT (manufactured by Takeda Pharmaceutical Co., Ltd., trade name), CYANOX1790 (manufactured by SOLVAY Co., Ltd., trade name), and Sumilizer GA-80 (manufactured by Sumitomo Chemical Co., Ltd., trade name), etc. Examples of phosphorus-based antioxidants include: triphenyl phosphite, nonyl diphenyl phosphite, (2-ethylhexyl) diphenyl phosphite, tris(2,4-di-tert-butylphenyl) phosphite, tris(nonylphenyl) phosphite, isooctyl diphenyl phosphite, 2,2'-methylene bis(4,6-di-tert-butylphenyl) octyl phosphite, isodecanyl diphenyl phosphite, mono(tridecyl) diphenyl phosphite, diisodecyl phenyl phosphite, di(tridecyl) diphenyl phosphite, and tris(2-ethylhexyl) diphenyl phosphite. Hexyl ester, Tris(isodecyl) phosphite, Tri(tetranyl) phosphite, Dibutyl phosphite, Trilauryl trithiophosphite, Tetra(2,4-di-tert-butylphenyl)-4,4'-biphenyl diphosphite, 4,4'-isopropylbenzyl dodecyl phosphite, 4,4'-isopropylbenzyl tridecyl phosphite, 4,4'-isopropylbenzyl tetradecyl phosphite, 4,4'-isopropylbenzyl pentadecyl phosphite, 4,4'-butylene bis(3-methyl-6-) (Tri-butylphenyl) di-tetrazyl phosphite, bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, bis(nonylphenyl) pentaerythritol diphosphite, distearate pentaerythritol diphosphite, phenyl bisphenol A pentaerythritol diphosphite, tetraphenyl dipropylene glycol diphosphite, 1,1,3-tris(2-methyl-4-di-tetrazylphosphite-5-tert-butylphenyl)butane, 3,4,5,6 Dibenzo-1,2-oxophosphine, triphenylphosphine, diphenylbutylphosphine, diphenyloctadecylphosphine, tris(p-tolyl)phosphine, tris(p-nonylphenyl)phosphine, tris(naphthyl)phosphine, diphenyl(hydroxymethyl)phosphine, diphenyl(ethoxymethyl)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, phenylnaphthylbenzylphosphine, etc. Commercially available phosphorus-based antioxidants include, for example: Irgafos 168 (manufactured by BASF JAPAN Co., Ltd., trade name), Irgafos 12 (manufactured by BASF JAPAN Co., Ltd., trade name), Irgafos 38 (manufactured by BASF JAPAN Co., Ltd., trade name), Adekastab 2112 (manufactured by ADEKA Co., Ltd., trade name), Adekastab C (manufactured by ADEKA Co., Ltd., trade name), Adekastab 329K (manufactured by ADEKA Co., Ltd., trade name), Adekastab PEP36 (manufactured by ADEKA Co., Ltd., trade name), JC-263 (manufactured by Chengbei Chemical Industry Co., Ltd., trade name), Sandstab P-EPQ (manufactured by Clariant, trade name), and Doverphos S-9228PC (manufactured by Dover Chemical, trade name), etc. The aforementioned antioxidants can be used in one or in combination of two or more. The content of the antioxidant in the polycarbonate resin composition of the present invention, relative to 100 parts by weight of the polycarbonate resin (S), is preferably 0.001 parts by weight to 0.5 parts by weight, more preferably 0.01 parts by weight to 0.3 parts by weight, and even more preferably 0.05 parts by weight to 0.3 parts by weight. If the antioxidant content relative to 100 parts by weight of the polycarbonate resin (S) is within the above range, sufficient antioxidant effect can be obtained, and mold contamination during molding can be suppressed. <UV Absorbers> Other specific examples of additives include UV absorbers. Suitable UV absorbers include benzotriazole compounds, benzo[a]pyrene compounds, salicylate compounds, malonic acid ester compounds, oxadiazine compounds, triazine compounds, benzophenone compounds, and cyanoacrylate compounds. As benzotriazole compounds, examples include: 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-ditert-pentylphenyl)benzotriazole, 2-(2'-hydroxy-5'-tert-butylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-ditert-butylphenyl)benzotriazole, 2-[2'-hydroxy-3',5'-bis(α,α-dimethylbenzyl)phenyl]-2H-benzotriazole, 2,2'-methylene-bis[4-methyl-6-(benzotriazole-2-yl)phenol], 2,2'-methylenebis(6-(2H-benzotriazole-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol), etc. Examples of triterpenoid compounds include, specifically, 2-(4,6-diphenyl-1,3,5-triterpenoid-2-yl)-5-(hexyloxy)phenol and 2-(4,6-bis-2,4-dimethylphenyl-1,3,5-triterpenoid-2-yl)-5-(hexyloxy)phenol. Examples of benzophenone compounds include, specifically, 2-hydroxy-4-n-octyloxybenzophenone, 2-hydroxy-4-methoxybenzophenone, and 2-hydroxy-4-ethoxybenzophenone. Examples of cyanoacrylate compounds include, specifically, 2-ethyl-2-cyano-3,3-diphenylacrylate, 2-ethylhexyl-2-cyano-3,3-diphenylacrylate, and 1,3-bis-[2'-cyano-3,3'-diphenylacryloxy]-2,2-bis-[(2-cyano-3',3'-diphenylacryloxy)oxy]methylpropane. Of these, preferably at least one is selected from the group consisting of benzotriazole compounds, malonic acid ester compounds, triazole compounds, and benzo[a]triazole compounds. Examples of commercially available ultraviolet absorbers include: SEESORB 709 (manufactured by Shipro Kasei Corporation, trade name), KEMISORB 79 (manufactured by Chemipro Kasei Corporation, trade name), KEMISORB 279 (manufactured by Chemipro Kasei Corporation, trade name), HOSTAVIN B-CAP (manufactured by Clariant, trade name), Tinuvin 234 (manufactured by BASF JAPAN Corporation, trade name), Tinuvin 1577 (manufactured by BASF JAPAN Corporation, trademark), CYASORB UV-3638 F (manufactured by SOLVAY Corporation), etc. The aforementioned ultraviolet absorbers can be used in one or more combinations. The content of the ultraviolet absorber in the polycarbonate resin composition of the present invention is preferably 0.01 parts by weight to 1 part by weight relative to 100 parts by weight of the polycarbonate resin (S), more preferably 0.05 parts by weight to 0.7 parts by weight. If the content of the ultraviolet absorber is within the above range, sufficient lightfastness can be obtained; if it is 1 part by weight or less, mold contamination during molding can be sufficiently suppressed. <Properties of the Polycarbonate Resin Composition> The polycarbonate resin composition of the present invention, by having the above-mentioned composition, can possess both excellent transparency and impact resistance. The polycarbonate resin composition of the present invention exhibits excellent transparency. Transparency can be evaluated, for example, by means of a haze value. In a molded article with a thickness of 3 mm, the haze value of the polycarbonate resin composition of the present invention, measured according to ISO 14782:1999 (JIS K 7136:2000), is preferably 0.1 to 1.0 and less, more preferably 0.2 to 0.9 and less, and even more preferably 0.3 to 0.6 and less. The polycarbonate resin composition of the present invention exhibits excellent impact resistance, particularly at low temperatures. Impact resistance can be evaluated, for example, by Charpy impact strength, as shown in the examples described later. The polycarbonate resin composition of the present invention also exhibits excellent chemical resistance. Chemical resistance can be evaluated, for example, by the methods shown in the examples described later. In a preferred embodiment of the polycarbonate resin composition of the present invention, a region (d) containing the aforementioned polyorganosiloxane block (A-2) exists in a matrix in which the aforementioned aromatic polycarbonate resin (S-2) is the main component. The normalized dispersion of the average region size of region (d) is preferably 40% or less, more preferably 20% or less, and even more preferably 18% or less. The average region size and its normalized dispersion can be evaluated using small-angle X-ray scattering (SAXS) according to Japanese Patent Application Publication No. 2011-102364. Average region size refers to the average number of sizes in each region (d). Normalized dispersion refers to a parameter obtained by normalizing the breadth of particle size distribution to the average region size; specifically, it is the value obtained by normalizing the dispersion of the size of region (d) to the average region size, expressed by the following formula (X): Normalized dispersion (%) = σ / D AV (X) [where σ represents the standard deviation of the region size (d), D] AV [Meaning of Average Region Size] "Average Region Size" and "Standardized Dispersion" refer to the measured values ​​obtained by small-angle X-ray scattering (SAXS) using a 1.0 mm thick molded article formed by injection molding. Specifically, using a three-section flat plate (50 mm wide, 90 mm long, with thicknesses of 3.0 mm (20 mm long), 2.0 mm (45 mm long), and 1.0 mm (25 mm long) from the gate side, and an arithmetic mean surface roughness (Ra) of 0.03 μm), the average size and particle size distribution (standardized dispersion) of the polydiorganosiloxane region at the intersection of a 5 mm distance from the end of the 1.0 mm thick section and a 5 mm distance from the side section were measured by SAXS. The content of the polyorganosiloxane block (A-2) in the polycarbonate resin composition is preferably 0.5% by mass or more and not more than 8% by mass, more preferably 1% by mass or more and not more than 6% by mass, further preferably 2.7% by mass or more and not more than 5% by mass, and even more preferably 3.1% by mass or more and not more than 5% by mass. If the content of the polyorganosiloxane block (A-2) in the polycarbonate resin composition is within the above range, a polycarbonate resin composition with superior transparency and impact resistance at low temperatures can be obtained. The content of the polyorganosiloxane block (A-2) in the polycarbonate resin (S) is calculated by nuclear magnetic resonance (NMR) measurement, in the same manner as the content of the polyorganosiloxane block (A-2) in the PC-POS copolymer (S-1) described above. [Molded Articles] Various molded articles are manufactured using the polycarbonate resin composition of the present invention obtained by melt mixing or the resulting granules as raw materials, by injection molding, injection compression molding, extrusion molding, blow molding, pressure molding, vacuum forming, and foam molding. In particular, granules obtained by melt mixing are suitable for manufacturing injection-molded articles by injection molding and injection compression molding. Molded articles comprising the polycarbonate resin composition of the present invention can be suitably used, for example, as exterior and interior parts for electrical / electronic machines such as televisions, radios, cameras, camcorders, audio players, DVD (Digital Versatile Disc) players, air conditioners, mobile phones, smartphones, transceivers, displays, computers, tablet terminals, portable game consoles, stationary game consoles, wearable electronic devices, registers, calculators, photocopiers, printers, fax machines, communication base stations, batteries, and robotic arms; as well as exterior and interior parts for automobiles, railways, ships, aircraft, space industry machinery, medical machines, and building materials. [Examples] The invention is illustrated in more detail by way of examples, but the invention is not limited to these examples in any way. The characteristic values ​​and evaluation results in each example are obtained in accordance with the following principles. (1) The average chain length and content of the polyorganosiloxane block (A-2) were determined by... 1 ¹H-NMR determination was performed, and the average chain length and content of the polyorganosiloxane block (A-2) were calculated based on the integral ratio of the methyl groups of the polydimethylsiloxane constituting the polyorganosiloxane block (A-2). Furthermore, in this specification, polydimethylsiloxane is sometimes simply referred to as PDMS. <Quantitative Method for the Average Chain Length of Polyorganosiloxane Block (A-2)> 1H-NMR Measurement Conditions: NMR Apparatus: ECA-500 manufactured by JEOL RESONANCE Co., Ltd.; Probe: 50TH5AT / FG2; Nucleus Detection: 1 H Observation range: -5 to 15 ppm Observation center: 5 ppm Pulse repetition time: 9 seconds Pulse width: 45° NMR sample tubes: 5 Sample amount: 30–40 mg; Solvent: deuterium chloroform; Measurement temperature: room temperature; Total number of measurements: 256. Case A: Integral value of the methyl group in the dimethylsiloxane moiety observed near δ -0.02–0.5; Case B: Integral value of the methylene group of allylphenol observed near δ 2.50–2.75. Chain length of polydimethylsiloxane = (A / 6) / (B / 4). Case A: Integral value of the methyl group in the dimethylsiloxane moiety observed near δ -0.02–0.5; Case B: Integral value of the methylene group of eugenol observed near δ 2.40–2.70. Chain length of polydimethylsiloxane = (A / 6) / (B / 4). <Quantitative Method for the Content of Polyorganosiloxane Block (A-2)> A quantitative method for the amount of polydimethylsiloxane copolymerized in PTBP-terminated polycarbonate synthesized by copolymerization of allylphenol-terminated polydimethylsiloxane. 1 H-NMR Measurement Conditions: NMR Apparatus: ECA-500 manufactured by JEOL RESONANCE Co., Ltd.; Probe: 50TH5AT / FG2; Nucleus Detection: 1 H Observation range: -5 to 15 ppm Observation center: 5 ppm Pulse repetition time: 9 seconds Pulse width: 45° Total number of times: 256 NMR sample tubes: 5 Sample amount: 30–40 mg; Solvent: deuterium chloroform; Measurement temperature: room temperature; A: Integrated value of methyl groups in the BPA region observed near δ 1.5–1.9; B: -Si(CH) group observed near δ -0.02–0.3. 3) The integral value C of the methyl group of the 2-part group: The integral value of the butyl group of the p-tertiary butylphenyl group observed around δ 1.2–1.4: 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 (wt%) = g × 74.1 / TW × 100 (2) Viscosity average molecular weight The viscosity average molecular weight (Mv) is determined by measuring the viscosity of a dichloromethane solution at 20°C using an Ubbelohde viscometer, and the limiting viscosity [η] is obtained from this, and calculated according to the following formula (Schnell formula). [Number 2] <Manufacturing Example 1: Manufacturing of Polycarbonate-Polyorganosiloxane Copolymer (S-1-1) (PC-PDMS(S-1-1))> (Step 1: Manufacturing 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 the bisphenol A (BPA) to be dissolved thereafter. BPA was dissolved in the solution to a concentration of 13.5% by mass, thus preparing a sodium hydroxide aqueous solution of BPA. This sodium hydroxide aqueous solution of BPA was continuously passed through a tubular reactor with an inner diameter of 6 mm and a length of 30 m at a flow rate of 40 L / hr, dichloromethane at 15 L / hr, and phosgene at 4.0 kg / hr. The tubular reactor had a sleeve section through which cooling water was circulated to maintain the temperature of the reaction solution below 40°C. The reaction liquid discharged from the tubular reactor was continuously introduced into a 40 L baffled trough reactor equipped with swept wings. A sodium hydroxide aqueous solution of BPA was added at a flow rate of 2.8 L / hr, a 25% by mass sodium hydroxide aqueous solution was added at a flow rate of 0.07 L / hr, water was added at a flow rate of 17 L / hr, and a 1% by mass triethylamine aqueous solution was added at a flow rate of 0.64 L / hr to carry out the reaction. The reaction liquid overflowing from the trough reactor was continuously pumped out and allowed to stand, thereby separating and removing the aqueous phase and collecting the dichloromethane phase. The resulting polycarbonate oligomer had a concentration of 341 g / L and a chloroformate group concentration of 0.71 mol / L. (Step 2: Manufacturing of PC-PDMS) In a 50 L tank reactor equipped with baffles, paddle-shaped stirring blades and cooling sleeves, add 15 L (i) of polycarbonate oligomer solution (PCO) prepared in the above manufacturing example, 8.6 L (ii) of dichloromethane (MC), 380 g (iv) of polydimethylsiloxane modified polydimethylsiloxane with an average chain length n of 37 (iii) and allylphenol-terminated, which is dissolved in 2 L (v) of dichloromethane, and 11.2 mL (vi) of triethylamine (TEA). Under stirring, add an aqueous solution of sodium hydroxide (obtained by dissolving 170 g (vii) of sodium hydroxide in 2 L (viii) of pure water) and carry out the reaction of polycarbonate oligomer with allylphenol-terminated modified PDMS for 20 minutes. To the polymerization solution, a dichloromethane solution of p-tert-butylphenol (PTBP) (obtained by dissolving 146.8 g (ix) of PTBP in 0.5 L (x) of dichloromethane) and an aqueous solution of bisphenol A in sodium hydroxide (obtained by dissolving 562 g (xi) of sodium hydroxide and sodium dithionite (Na)) were added. 2S 2O 4) An aqueous solution obtained by dissolving 1.7 g (xii) in 8.2 L (xiii) of pure water was used to dissolve 826 g (xiv) of bisphenol A, and a polymerization reaction was carried out for 40 minutes. For dilution, 10 L (xv) of dichloromethane was added and stirred for 20 minutes, separating the organic phase containing polycarbonate-polydimethylsiloxane copolymer (PC-PDMS) and the aqueous phase containing excess bisphenol A and sodium hydroxide. The organic phase was isolated separately. The resulting PC-PDMS dichloromethane solution was washed successively with 15% (v / L) 0.03 mol / L sodium hydroxide aqueous solution and 0.2 mol / L hydrochloric acid, followed by repeated washing with pure water until the conductivity of the aqueous phase was below 5 μS / cm. The PC-POS copolymer obtained by washing was concentrated and pulverized in a dichloromethane solution, and the resulting sheets were dried under reduced pressure at 120°C to produce PC-PDMS (S-1-1). The obtained PC-PDMS (S-1-1) had a polyorganosiloxane block (A-2) content of 6.0% by mass as determined by NMR, an average chain length of 37 for the polyorganosiloxane block (A-2), and a viscosity average molecular weight (Mv) of 17,700. <Manufacturing Examples 2-9: Manufacturing of PC-PDMS (S-1-2) to (S-1-9)> PC-PDMS (S-1-2) to (S-1-9) were manufactured in the same manner as in Manufacturing Example 1, except that the values ​​of (i) to (xv) shown in Table 1 were changed as shown in the table. The content of polyorganosiloxane blocks (A-2), the average chain length of polyorganosiloxane blocks (A-2), and the average molecular weight Mv of viscosity of each PC-PDMS are shown in Table 1. [Table 1] Table 1 <Aromatic Polycarbonate Resins (S-2)> (S-2-1): Tarflon FN1300 (trade name) [Manufactured by Idemitsu Kosan Co., Ltd., average molecular weight = 11,500] (S-2-2): Tarflon FN1500 (trade name) [Manufactured by Idemitsu Kosan Co., Ltd., average molecular weight = 14,500] (S-2-3): Tarflon FN1700 (trade name) [Manufactured by Idemitsu Kosan Co., Ltd., average molecular weight = 17,700] (S-2-4): Tarflon FN1900 (trade name) [Manufactured by Idemitsu Kosan Co., Ltd., average molecular weight = 19,100] (S-2-5): Tarflon FN2200 (trade name) [Manufactured by Idemitsu Kosan Co., Ltd., average molecular weight = 21,200] (S-2-6): Tarflon FN2500 (trade name) [manufactured by Idemitsu Kosan Co., Ltd., average molecular weight = 23,400] (S-2-7): Iupilon E-2000 (trade name) [manufactured by Mitsubishi Engineering-Plastics Co., Ltd., average molecular weight = 25,500] (S-2-8): NOVAREX 7030PJ (trade name) [manufactured by Mitsubishi Engineering-Plastics Co., Ltd., average molecular weight = 29,500] <Other Ingredients> Antioxidant: IRGAFOS 168 (trade name) [tris(2,4-di-tert-butylphenyl) phosphite, manufactured by BASF JAPAN Ltd.] UV absorber: CYASORB UV-3638 F (trade name) [2,2'-(p-phenyl)di-3,1-benzoxazol-4-one, manufactured by SOLVAY Ltd.] UV absorber: KEMISORB 79 (trade name) [2-benzotriazolyl-4-tert-octylphenol, manufactured by Chemipro Kasei Ltd.] Examples 1-12 and Comparative Examples 1-10: The PC-PDMS (S-1-1) to (S-1-9) obtained in Manufacturing Examples 1-9, along with other components, were mixed at the blending ratios shown in Table 3 and fed into a vented twin-screw extruder (manufactured by Toshiba Machine Co., Ltd., TEM35B). Melt mixing was performed at a screw speed of 150 rpm, an output rate of 20 kg / hr, and a resin temperature of 295-300°C to obtain evaluation particle samples. Using these evaluation particle samples, the content and Mv of the polyorganosiloxane block (A-2) in the polycarbonate resin composition were determined, and transparency, impact resistance, and chemical resistance were evaluated using the methods described below. (1) Transparency: Haze value was measured in a 3 mm thick molded body according to ISO 14782:1999 (JIS K 7136:2000). The results are shown in Table 3. (2) Impact resistance: IZOD test piece (63×13×3.2 mm) was produced by drying the obtained particles at 120°C for 8 hours using an injection molding machine (manufactured by Nissei Resin Kogyo Co., Ltd., NEX110, screw diameter 36 mm) at a cylinder temperature of 280°C and a mold temperature of 80°C. The IZOD impact strength at -30°C and -40°C was measured using a notched test piece after post-processing of the test piece according to ASTM standard D-256. The results are shown in Table 3. (3) Chemical resistance: After drying the obtained particles at 120°C for 8 hours, the particles were injection molded using an injection molding machine (manufactured by Nissei Resin Industries, Ltd., NEX110, screw diameter 36 mm) at a cylinder temperature of 280°C and a mold temperature of 80°C to produce test pieces with a length of 95 mm in the long side direction and a cross-section perpendicular to the long side direction as shown in Figure 1. Three test pieces were made from each particle sample as shown below, i.e., the thickness t in Figure 1, the vertical distance e from the center of the figure to the upper surface, the length B of the short side direction of the upper surface, and the acute angle θ formed by the surface perpendicular to the bottom surface and the side surface are the values ​​shown in Table 2 below. [Table 2] Table 2 Prepare the following fixture: three cylindrical shafts made of SUS304 material, each 10 mm in diameter and 70 mm in length, are aligned at both ends along their long sides, with their short sides arranged in the cross-sectional view shown in Figure 2, and fixed parallel to each other. Specifically, one cylindrical shaft is used as the central shaft 22, and the other two are used as the two end shafts 23. The perpendicular distance between the plane of the central shaft 21 containing the two end shafts 23 and the central shaft 21 of the central shaft 22 is set to 11.3 mm, and the distance L between the central shafts 21 of the two end shafts 23 is set to 60 mm. Fix each test piece to the fixture as shown in Figure 3. Specifically, each test piece 31 is fixed to the fixture with its bottom center connected to the central shaft 32, its upper surface connected to the two end shafts 33, and its long side perpendicular to the long side of each shaft. The perpendicular distance G between the cross-section 36 on the central shaft 32 (which connects to the test piece 31) and the cross-section 35 on the two shafts 33 (which connect to the test piece 31) is set to 1.3 mm, and the distance L between the two shafts 33 is set to 60 mm. A sunscreen, "NIVEA (trademark) SUN Protect and Moisture Lotion SPF30" (manufactured by Beiersdorf), is applied from the center of the test piece's upper surface towards the long side with a width of 1 cm on each side. After 72 hours at 23°C, the presence of cracks is visually confirmed, and the appearance change is evaluated. For each thickness t, three test pieces are prepared, and the thickness t of the test piece with at least two test pieces that do not crack is determined. m The results are shown in Table 3. [Table 3-1] Table 3 (Part 1) [Table 3-2] Table 3 (Part 2) Examples 13-14: Evaluation particle samples were obtained in the same manner as in Example 1, except that the components were mixed in the proportions shown in Table 4. Using these evaluation particle samples, the PDMS content and Mv of the polycarbonate resin composition were determined, and the transparency, impact resistance, and chemical resistance were evaluated, in the same manner as in Example 1. Excellent transparency, impact resistance, and chemical resistance were also observed in Examples 13 and 14. Furthermore, lightfastness was also expected in Examples 13 and 14, which contained an ultraviolet absorber. [Table 4] Table 4 21: Central axis of the shaft 22: Central axis 23: Two-end shafts 31: Test piece 32: Central axis 33: Two-end shafts 34: Center of the test piece 35: Cross-section on the two-end shafts including the junction of the two-end shafts and the test piece 36: Cross-section on the central axis including the junction of the central axis and the test piece B: Length of the short side of the upper surface e: Perpendicular distance from the center of the image to the upper surface G: Distance L: Distance t: Thickness θ: Acute angle formed by the surface perpendicular to the bottom surface and the side surface Figure 1 is a cross-sectional view of a test piece used for evaluating chemical resistance. Figure 2 is a cross-sectional view of the fixture used for evaluating chemical resistance along its short side. Figure 3 is a schematic diagram of the test piece fixed to the fixture used for evaluating chemical resistance. B: Length of the shorter side of the upper surface e: Vertical distance from the center of the graph to the top surface t: thickness θ: The acute angle formed by the plane perpendicular to the base and the side surface.

Claims

1. A polycarbonate-based resin composition comprising a polycarbonate-based resin (S), the polycarbonate-based resin (S) comprising a polycarbonate-organosiloxane copolymer (S-1) and an aromatic polycarbonate-based resin (S-2) other than the polycarbonate-organosiloxane copolymer (S-1), wherein the polycarbonate-organosiloxane copolymer (S-1) comprises a polycarbonate block (A-1) containing 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), the polycarbonate-based resin (S) having a viscosity-average molecular weight MvPC of 20,000 or more and 30,000 or less, and the content of the polyorganosiloxane block (A-2) in the polycarbonate-organosiloxane copolymer (S-1) being 0.5% by mass or more and 9% by mass or less. The average chain length n of the polyorganosiloxane block (A-2) is 20 or more but less than 60. The difference between the viscosity-average molecular weight MvPC of the polycarbonate resin (S) and the viscosity-average molecular weight MvSi of the polycarbonate-polyorganosiloxane copolymer (S-1), MvSi-MvPC, is -3,100 to 6,000. In a molded body with a thickness of 3 mm, the haze value measured according to ISO 14782:1999 is 0.1 to 1.

0. [Chemical 1] [In the formula, R1 and R2 independently represent a halogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms, respectively; X represents a single bond, an alkyl group having 1 to 8 carbon atoms, an alkylene group having 2 to 8 carbon atoms, an alkylene group having 5 to 15 carbon atoms, an alkylene group having 5 to 15 carbon atoms, an alkylene group having 5 to 15 carbon atoms, an alkylene group having 7 to 15 carbon atoms, -S-, -SO-, -SO2-, -O-, or -CO-; R3 and R4 independently represent 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, respectively; a and b independently represent integers from 0 to 4].

2. The polycarbonate-based resin composition of claim 1, wherein the difference between the viscosity average molecular weight MvPC of the polycarbonate-based resin (S) and the viscosity average molecular weight MvSi of the polycarbonate-polyorganosiloxane copolymer (S-1), MvSi-MvPC, is -1,500 to 6,000.

3. The polycarbonate-based resin composition of claim 2, wherein the difference between the viscosity average molecular weight MvPC of the polycarbonate-based resin (S) and the viscosity average molecular weight MvSi of the polycarbonate-polyorganosiloxane copolymer (S-1), MvSi-MvPC, is -500 to 6,000.

4. The polycarbonate-based resin composition of any one of claims 1 to 3, wherein the viscosity-average molecular weight MvSi of the polycarbonate-polyorganosiloxane copolymer (S-1) is 18,500 or more and 25,000 or less.

5. The polycarbonate resin composition of any one of claims 1 to 3, wherein the content of the polyorganosiloxane block (A-2) in the polycarbonate-polyorganosiloxane copolymer (S-1) is 0.5% by mass or more and 8% by mass or less.

6. A polycarbonate resin composition according to any one of claims 1 to 3, wherein the polyorganosiloxane block (A-2) is a block unit represented by any one of the following general formulas (II-I), (II-II), and (II-III), [Chemical 2] [wherein, R3 to R6 independently represent 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 the plurality of R3 to R6 may be the same or different from each other; Y represents -R7O-, -R7COO-, -R7NH-, -R7NR8-, -COO-, -S-, -R7COO-R9-O-, or -R7O-R10-O-, and the plurality of Y may be the same or different from each other; the above R7 represents a single bond, straight chain, branched chain, or cyclic alkyl group, aryl-substituted alkyl group, substituted or unsubstituted aryl group, or diaryl group; R8 represents an alkyl group, alkenyl group, aryl group, or aralkyl group; R9 represents a diaryl group; R10 represents a straight chain, branched chain, or cyclic alkyl group, or a diaryl group; β represents a divalent group derived from a diisocyanate compound, or a divalent group derived from a dicarboxylic acid or a halide of a dicarboxylic acid; n is as described above, and p is an integer from 1 to n-2.

7. A polycarbonate resin composition according to any one of claims 1 to 3, wherein the polycarbonate-polyorganosiloxane copolymer (S-1) substantially does not contain the block unit (A-3) represented by the following general formula (IV), [Chemical 3] [wherein, R21 to R24 are independently hydrogen atoms, halogen atoms, alkyl groups having 1 to 6 carbon atoms, alkoxy groups having 1 to 6 carbon atoms, or aryl groups having 6 to 12 carbon atoms, respectively; R25 is an alkyl group having 1 to 6 carbon atoms, hydrogen atoms, halogen atoms, hydroxyl groups, alkoxy groups having 1 to 6 carbon atoms, or aryl groups having 6 to 14 carbon atoms; Q2 is a divalent aliphatic group having 1 to 10 carbon atoms; m represents the average chain length and is an integer of 10 or more].

8. The polycarbonate-based resin composition of any one of claims 1 to 3, wherein the polycarbonate-polyorganosiloxane copolymer (S-1) is composed only of polycarbonate blocks (A-1) and polyorganosiloxane blocks (A-2).

9. The polycarbonate resin composition of any one of claims 1 to 3, wherein the average chain length n of the polyorganosiloxane block (A-2) is greater than 30 and less than 60.

10. The polycarbonate resin composition of any one of claims 1 to 3, wherein the viscosity-average molecular weight of the aromatic polycarbonate resin (S-2) is 11,000 or more and 30,000 or less.

11. A molded article obtained by molding a polycarbonate-based resin composition as claimed in any one of claims 1 to 10.

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