JP2023002164A - Polycarbonate-based resin composition and molding - Google Patents

Abstract

To provide a polycarbonate-based resin composition by which a molding with improved brightness difference between a highlight part and a shade part in a metallic appearance can be obtained while reduction of impact resistance is suppressed.SOLUTION: [1] A polycarbonate-based resin composition contains polycarbonate-based resin (S) that consists of polycarbonate-polyorganosiloxane copolymer (A) including a specific polycarbonate block (A-1) and a specific polyorganosiloxane block (A-2), and specific polycarbonate resin (A'), 0.10 pt. mass or more and 0.30 pt. mass or less of metal aluminum particle (B) and 0.10 pt. mass or more and 0.50 pt. mass or less of ultraviolet light absorber (C) with respect to 100 pts. mass of polycarbonate-based resin (S), where the copolymer (A) includes the polyorganosiloxane block (A-2) by 5.0 mass% or more and 7.0 mass% or less, and has specific viscosity-average molecular weight, the polycarbonate-based resin (S) includes the copolymer (A) by 55 mass% or more and 70 mass% or less, includes the polyorganosiloxane block (A-2) by 3.0 mass% or more and 4.0 mass% or less, and has specific viscosity-average molecular weight. [2] A molding consists of the polycarbonate-based resin composition.SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to a polycarbonate resin composition and a molded article.

A molded article made of a polycarbonate-based resin composition (hereinafter also referred to as a "polycarbonate-based resin molded article" or "molded article") has, for example, a good balance of transparency, heat resistance, mechanical properties, etc. , as an industrial transparent material in the electric/electronics, mechanical, and automotive fields, or as an optical material for lenses, optical discs, and the like.
Furthermore, in order to improve the design of the molded article, attempts have been made to improve the product image by adding glossy particles or the like to the polycarbonate resin composition. For example, a metallic appearance can be obtained by adding glossy particles or the like to the polycarbonate-based resin composition.

Techniques relating to a polycarbonate-based resin composition capable of imparting a metallic appearance include, for example, those described in Patent Documents 1 and 2.

In Patent Document 1, (A) 60 to 90% by mass of an aromatic polycarbonate resin, (B) 5 to 20% by mass of glass fiber having a refractive index difference of 0.02 or less from the aromatic polycarbonate resin, and (C ) With respect to 100 parts by mass of the glass fiber-containing resin component composed of 5 to 25% by mass of polymethyl methacrylate resin, (D) (D-1) 0.005 to 1.00 of glossy particles having an average particle size of 10 µm or more and less than 60 µm. 5 parts by mass, (D-2) 0.005 to 5 parts by mass of glossy particles having an average particle size of 60 to 300 μm, and (E) 0.05 to 0.05 parts by mass of titanium oxide having an average particle size of 0.05 to 3 μm The polycarbonate resin composition containing 0.4 parts by mass reduces the visibility of the weld line fused part, does not show a difference in brightness between the left and right sides of the weld line, and is a molded product having a good metallic appearance and galaxy appearance. is obtained and is excellent in heat resistance and mechanical properties.

Patent Document 2 discloses a polycarbonate-polyorganosiloxane copolymer (A) containing a specific polycarbonate block (A-1) and a specific polyorganosiloxane block (A-2), and a specific polycarbonate resin (A'). Polycarbonate resin (S) consisting of, and 0.01 to 0.05 parts by mass of metal aluminum particles (B) and 0.1 to 0.5 parts by mass with respect to 100 parts by mass of polycarbonate resin (S) The copolymer (A) contains an ultraviolet absorber (C), contains 5 to 7% by mass of a polyorganosiloxane block (A-2), has a specific viscosity average molecular weight, and is a polycarbonate resin (S). contains 55 to 70% by mass of the copolymer (A), contains 3 to 4% by mass of the polyorganosiloxane block (A-2), and has a specific viscosity average molecular weight. It is described that appearance defects such as black lines that may occur when particles are blended can be suppressed, and the impact resistance is also excellent.

Japanese Unexamined Patent Application Publication No. 2011-94070 Japanese Patent Application Laid-Open No. 2020-84005

In recent years, from the viewpoint of further improving the design properties of polycarbonate-based resin molded articles, there has been a demand for improving the luminance difference between the highlight portion and the shade portion in a metallic appearance while suppressing a decrease in impact resistance.

The present invention has been made in view of the above circumstances, and is a polycarbonate-based resin capable of obtaining a molded article having an improved luminance difference between a highlight portion and a shade portion in a metallic appearance while suppressing a decrease in impact resistance. A composition is provided.

The present inventors have found that a polycarbonate resin composition containing a polycarbonate resin containing a specific copolymer unit, a specific amount of metallic aluminum particles, and a specific amount of an ultraviolet absorber suppresses a decrease in impact resistance. In addition, the inventors have found that it is possible to obtain a molded article having an improved luminance difference between the highlight portion and the shade portion in the metallic appearance.

That is, according to the present invention, the following polycarbonate-based resin composition and molded article are provided.

［式中、Ｒ^１及びＲ^２はそれぞれ独立に、ハロゲン原子、炭素数１～６のアルキル基又は炭素数１～６のアルコキシ基を示す。Ｘは、単結合、炭素数１～８のアルキレン基、炭素数２～８のアルキリデン基、炭素数５～１５のシクロアルキレン基、炭素数５～１５のシクロアルキリデン基、フルオレンジイル基、炭素数７～１５のアリールアルキレン基、炭素数７～１５のアリールアルキリデン基、－Ｓ－、－ＳＯ－、－ＳＯ_２－、－Ｏ－又は－ＣＯ－を示す。Ｒ^３及びＲ^４はそれぞれ独立に、水素原子、ハロゲン原子、炭素数１～６のアルキル基、炭素数１～６のアルコキシ基又は炭素数６～１２のアリール基を示す。ａ及びｂは、それぞれ独立に０～４の整数を示す。］

［式中、Ｒ^３０及びＲ^３１は、それぞれ独立に、ハロゲン原子、炭素数１～６のアルキル基又は炭素数１～６のアルコキシ基を示す。Ｘ’は単結合、炭素数１～８のアルキレン基、炭素数２～８のアルキリデン基、炭素数５～１５のシクロアルキレン基、炭素数５～１５のシクロアルキリデン基、－Ｓ－、－ＳＯ－、－ＳＯ_２－、－Ｏ－又は－ＣＯ－を示す。ｄ及びｅは、それぞれ独立に０～４の整数を示す。］
［２］
前記金属アルミニウム粒子（Ｂ）の含有量が、前記ポリカーボネート－ポリオルガノシロキサン共重合体（Ａ）１００質量部に対し、０．２０質量部以上０．５０質量部以下である、上記［１］に記載のポリカーボネート系樹脂組成物。
［３］
ポリメチルメタクリレート樹脂の含有量が、前記ポリカーボネート系樹脂（Ｓ）１００質量部に対し、５．０質量部以下である、上記［１］又は［２］に記載のポリカーボネート系樹脂組成物。
［４］
酸化チタンの含有量が、前記ポリカーボネート系樹脂（Ｓ）１００質量部に対し、０．０５質量部以下である、上記［１］～［３］のいずれかに記載のポリカーボネート系樹脂組成物。
［５］
ガラス繊維の含有量が、前記ポリカーボネート系樹脂（Ｓ）１００質量部に対し、５．０質量部以下である、上記［１］～［４］のいずれかに記載のポリカーボネート系樹脂組成物。
［６］
前記金属アルミニウム粒子（Ｂ）以外の光沢粒子の含有量が、前記ポリカーボネート系樹脂（Ｓ）１００質量部に対し、０．００５質量部以下である、上記［１］～［５］のいずれかに記載のポリカーボネート系樹脂組成物。
［７］
上記［１］～［６］のいずれかに記載のポリカーボネート系樹脂組成物からなる成形体。
［８］
自動車内装部品である、上記［７］に記載の成形体。 [1]
Polyorgano containing a polycarbonate block (A-1) consisting of a repeating unit represented by the following general formula (I), and a repeating unit represented by the following general formula (II) and having an average repeating number of 85 or more and 95 or less Polycarbonate resin (S ), and with respect to 100 parts by mass of the polycarbonate resin (S), 0.10 parts by mass or more and 0.30 parts by mass or less of metal aluminum particles (B) and 0.10 parts by mass or more and 0.50 parts by mass or less of ultraviolet rays including an absorbent (C),
The polycarbonate-polyorganosiloxane copolymer (A) contains 5.0% by mass or more and 7.0% by mass or less of the polyorganosiloxane block (A-2), and has a viscosity of 16,000 or more and 18,000 or less. having an average molecular weight,
The polycarbonate-based resin (S) contains 55% by mass or more and 70% by mass or less of the polycarbonate-polyorganosiloxane copolymer (A), and contains 3.0% by mass or more of the polyorganosiloxane block (A-2). A polycarbonate resin composition containing 0% by mass or less and having a viscosity average molecular weight of 15,000 or more and 17,000 or less.

[In the formula, R ¹ and R ² each 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 is 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, carbon represents an arylalkylene group having 7 to 15 carbon atoms, an arylalkylidene group having 7 to 15 carbon atoms, -S-, -SO-, -SO ₂ -, -O- or -CO-. R ³ and R ⁴ each 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. a and b each independently represents an integer of 0 to 4; ]

[In the formula, R ³⁰ and R ³¹ each 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' is 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, -S-, -SO -, -SO ₂ -, -O- or -CO-. d and e each independently represent an integer of 0 to 4; ]
[2]
In the above [1], the content of the metal aluminum particles (B) is 0.20 parts by mass or more and 0.50 parts by mass or less with respect to 100 parts by mass of the polycarbonate-polyorganosiloxane copolymer (A) The polycarbonate-based resin composition described.
[3]
The polycarbonate-based resin composition according to [1] or [2] above, wherein the content of the polymethyl methacrylate resin is 5.0 parts by mass or less with respect to 100 parts by mass of the polycarbonate-based resin (S).
[4]
The polycarbonate-based resin composition according to any one of [1] to [3] above, wherein the content of titanium oxide is 0.05 parts by mass or less per 100 parts by mass of the polycarbonate-based resin (S).
[5]
The polycarbonate-based resin composition according to any one of [1] to [4] above, wherein the content of the glass fiber is 5.0 parts by mass or less with respect to 100 parts by mass of the polycarbonate-based resin (S).
[6]
Any one of the above [1] to [5], wherein the content of glossy particles other than the metal aluminum particles (B) is 0.005 parts by mass or less with respect to 100 parts by mass of the polycarbonate resin (S) The polycarbonate-based resin composition described.
[7]
A molded article made of the polycarbonate-based resin composition according to any one of [1] to [6] above.
[8]
The molded article according to [7] above, which is an automobile interior part.

According to the present invention, it is possible to provide a polycarbonate-based resin composition capable of obtaining a molded article having an improved luminance difference between a highlight portion and a shade portion in a metallic appearance while suppressing a decrease in impact resistance. .

BEST MODE FOR CARRYING OUT THE INVENTION The polycarbonate-based resin composition and the molded article thereof of the present invention are described in detail below. In this specification, any definition that is considered preferable can be adopted arbitrarily, and it can be said that a combination of preferable items is more preferable. In this specification, the description of "XX to YY" means "XX or more and YY or less".

1. Polycarbonate-based resin composition The polycarbonate-based resin composition of the present invention is represented by a polycarbonate block (A-1) consisting of a repeating unit represented by the following general formula (I) and the following general formula (II), and an average A polycarbonate containing a polyorganosiloxane block (A-2) containing a repeating unit having a repeating number of 85 or more and 95 or less - polyorganosiloxane copolymer (A), and a repeating unit represented by the following general formula (III) A polycarbonate resin (A′) consisting of a polycarbonate resin (S), and 0.10 parts by mass or more and 0.30 parts by mass or less of metal aluminum particles (B) with respect to 100 parts by mass of the polycarbonate resin (S) And 0.10 parts by mass or more and 0.50 parts by mass or less of an ultraviolet absorber (C), and the polycarbonate-polyorganosiloxane copolymer (A) contains 5.0 parts by mass of the polyorganosiloxane block (A-2). % or more and 7.0% or less by mass and has a viscosity average molecular weight of 16,000 or more and 18,000 or less, and the polycarbonate resin (S) is a polycarbonate-polyorganosiloxane copolymer (A) of 55% by mass. 70 mass % or less, contains 3.0 mass % or more and 4.0 mass % or less of the polyorganosiloxane block (A-2), and has a viscosity average molecular weight of 15,000 or more and 17,000 or less.
ADVANTAGE OF THE INVENTION According to the polycarbonate-based resin composition of the present invention, it is possible to obtain a molded article in which the difference in brightness between the highlight portion and the shade portion in the metallic appearance is improved while suppressing the decrease in impact resistance.
Here, in the present specification, the term “highlight portion” refers to a portion that looks bright due to specular reflection of light, and the term “shade portion” refers to a portion that does not reflect light and looks dark. The luminance difference between the highlight portion and the shade portion can be quantitatively evaluated by, for example, the luminous reflectance Y described in Examples below.

[Polycarbonate resin (S)]
The polycarbonate-based resin (S) consists of a polycarbonate-polyorganosiloxane copolymer (A) and a polycarbonate resin (A').

<Polycarbonate-polyorganosiloxane copolymer (A)>
The polycarbonate-polyorganosiloxane copolymer (hereinafter sometimes abbreviated as "PC-POS copolymer") (A) contained in the polycarbonate-based resin (S) is 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 having an average repeating number of 85 or more and 95 or less .

［式中、Ｒ^１及びＲ^２はそれぞれ独立に、ハロゲン原子、炭素数１～６のアルキル基又は炭素数１～６のアルコキシ基を示す。Ｘは、単結合、炭素数１～８のアルキレン基、炭素数２～８のアルキリデン基、炭素数５～１５のシクロアルキレン基、炭素数５～１５のシクロアルキリデン基、フルオレンジイル基、炭素数７～１５のアリールアルキレン基、炭素数７～１５のアリールアルキリデン基、－Ｓ－、－ＳＯ－、－ＳＯ_２－、－Ｏ－又は－ＣＯ－を示す。Ｒ^３及びＲ^４はそれぞれ独立に、水素原子、ハロゲン原子、炭素数１～６のアルキル基、炭素数１～６のアルコキシ基又は炭素数６～１２のアリール基を示す。ａ及びｂは、それぞれ独立に０～４の整数を示す。］

[In the formula, R ¹ and R ² each 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 is 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, carbon represents an arylalkylene group having 7 to 15 carbon atoms, an arylalkylidene group having 7 to 15 carbon atoms, -S-, -SO-, -SO ₂ -, -O- or -CO-. R ³ and R ⁴ each 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. a and b each independently represents an integer of 0 to 4; ]

In general formula (I) above, examples of halogen atoms independently represented by R ¹ and R ² include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
Examples of alkyl groups independently represented by R ¹ and R ² include methyl group, ethyl group, n-propyl group, isopropyl group, and various butyl groups ("various" means linear and branched The same shall apply hereinafter in the specification), various pentyl groups, and various hexyl groups. Examples of the alkoxy group independently represented by R ¹ and R ² include those having the above alkyl group as the alkyl group moiety.
R ¹ and R ² are each independently preferably an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms, more preferably an alkyl group having 1 to 6 carbon atoms, still more preferably It is an alkyl group having 1 to 3 carbon atoms, more preferably a methyl group.

Examples of the alkylene group represented by X include methylene group, ethylene group, trimethylene group, tetramethylene group, hexamethylene group and the like, 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.
The cycloalkylene group represented by X includes, for example, a cyclopentanediyl group, a cyclohexanediyl group, a cyclooctanediyl group and the like, and a cycloalkylene group having 5 to 10 carbon atoms is preferable.
The cycloalkylidene group represented by X includes, for example, a cyclohexylidene group, a 3,5,5-trimethylcyclohexylidene group, a 2-adamantylidene group and the like, and a cycloalkylidene group having 5 to 10 carbon atoms is preferred. , a cycloalkylidene group having 5 to 8 carbon atoms is more preferable.
The aryl moiety of the arylalkylene group represented by X includes, for example, an aryl group having 6 to 14 ring carbon atoms such as a phenyl group, a naphthyl group, a biphenyl group and an anthryl group. mentioned.
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. can be mentioned.

a and b each independently represent an integer of 0 to 4, preferably 0 to 2, more preferably 0 or 1, still more preferably 0;
Among them, a and b are 0 and X is a single bond or an alkylene group having 1 to 8 carbon atoms, or a and b are 0 and X is an alkylene group having 3 carbon atoms, particularly an isopropylidene group. Some are preferred.

In general formula (II) above, the halogen atom represented by R ³ or R ⁴ includes, for example, a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
Examples of the alkyl group represented by R ³ or R ⁴ include methyl group, ethyl group, n-propyl group, isopropyl group, various butyl groups, various pentyl groups and various hexyl groups.
Examples of the alkoxy group represented by R ³ or R ⁴ include cases where the alkyl group moiety is the aforementioned alkyl group.
Examples of the aryl group represented by ^R3 or ^R4 include a phenyl group and a naphthyl group.
Both R ³ and R ⁴ are 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 both are methyl groups. It is more preferable to have

More specifically, the polyorganosiloxane block (A-2) containing repeating units represented by the general formula (II) is represented by any one of the following general formulas (II-I) to (II-III). It is preferable to have units

［式中、Ｒ^３～Ｒ^６は、それぞれ独立に、水素原子、ハロゲン原子、炭素数１～６のアルキル基、炭素数１～６のアルコキシ基又は炭素数６～１２のアリール基を示し、複数のＲ^３～Ｒ^６は、互いに同一であっても異なっていてもよい。Ｙは－Ｒ^７Ｏ－、－Ｒ^７ＣＯＯ－、－Ｒ^７ＮＨ－、－Ｒ^７ＮＲ^８－、－ＣＯＯ－、－Ｓ－、－Ｒ^７ＣＯＯ－Ｒ^９－Ｏ－、又はＲ^７Ｏ－Ｒ^１０－Ｏ－を示し、複数のＹは、互いに同一であっても異なっていてもよい。前記Ｒ^７は、単結合、直鎖、分岐鎖若しくは環状アルキレン基、アリール置換アルキレン基、置換又は無置換のアリーレン基、又はジアリーレン基を示す。Ｒ^８は、アルキル基、アルケニル基、アリール基、又はアラルキル基を示す。Ｒ^９は、ジアリーレン基を示す。Ｒ^１０は、直鎖、分岐鎖もしくは環状アルキレン基、又はジアリーレン基を示す。βは、ジイソシアネート化合物由来の２価の基、又はジカルボン酸若しくはジカルボン酸のハロゲン化物由来の２価の基を示す。ｎはポリオルガノシロキサンの平均鎖長を示す。ｎ－１、及びｐとｑはそれぞれポリオルガノシロキサン単位の平均繰り返し数を示し、１以上の整数であり、ｐとｑの和はｎ－２である。］

[wherein R ³ to R ⁶ each 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, A plurality of R ³ to 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 O —R ¹⁰ —O—, and multiple Ys may be the same or different. ^R7 represents 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. ^R8 represents an alkyl group, alkenyl group, aryl group or aralkyl group. ^R9 represents a diarylene group. R 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 halide of a dicarboxylic acid. n indicates the average chain length of polyorganosiloxane. Each of n-1, p and q represents the average number of repeating polyorganosiloxane units and is an integer of 1 or more, and the sum of p and q is n-2. ]

Halogen atoms independently represented by R ³ to R ⁶ include, for example, fluorine, chlorine, bromine and iodine atoms.
Examples of alkyl groups independently represented by R ³ to R ⁶ include methyl group, ethyl group, n-propyl group, isopropyl group, various butyl groups, various pentyl groups, and various hexyl groups.
Examples of the alkoxy groups independently represented by R ³ to R ⁶ include cases where the alkyl group portion is the aforementioned alkyl group.
Examples of the aryl group independently represented by R ³ to R ⁶ include a phenyl group and a naphthyl group.
Each of R ³ to 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, and all are methyl groups. It is more preferable to have

-R ⁷ O-, -R ⁷ COO-, -R ⁷ NH-, -R ⁷ NR ⁸ -, -R ⁷ COO-R ⁹ -O-, or R ⁷ OR ¹⁰ -O- represented by Y The linear or branched alkylene group represented by R ⁷ includes an alkylene group having 1 to 8 carbon atoms, preferably 1 to 5 carbon atoms. Cyclic alkylene groups represented by R ⁷ include cycloalkylene groups having 5 to 15 carbon atoms, preferably 5 to 10 carbon atoms.

The aryl-substituted alkylene group represented by R ⁷ may have a substituent such as an alkoxy group or an alkyl group on the aromatic ring, and specific structures thereof include, for example, the following general formula (i) or ( ii) structure can be shown. Here, when R ⁷ represents an aryl-substituted alkylene group, the alkylene group is attached to Si.

（式中ｃは正の整数を示し、通常１～６の整数である）

(In the formula, c represents a positive integer, usually an integer of 1 to 6)

The diarylene group represented by R ⁷ , R ⁹ and R ¹⁰ is a group in which two arylene groups are linked directly or via a divalent organic group, specifically -Ar ¹ -W- A group having a structure represented by Ar ² —. Ar ¹ and Ar ² each represent an arylene group, and W represents a single bond or a divalent organic group. A divalent organic group represented by W is, for example, an isopropylidene group, a methylene group, a dimethylene group, or a trimethylene group.
Arylene groups represented by R ⁷ , Ar ¹ and Ar ² include, for example, arylene groups having 6 to 14 ring carbon atoms such as phenylene group, naphthylene group, biphenylene group and anthrylene group. These arylene groups may have arbitrary substituents such as alkoxy groups and alkyl groups.

Examples of alkyl groups represented by R ⁸ include linear or branched alkyl groups having 1 to 8 carbon atoms, preferably 1 to 5 carbon atoms.
Alkenyl groups represented by R ⁸ include, for example, linear or branched alkenyl groups having 2 to 8 carbon atoms, preferably 2 to 5 carbon atoms.
Examples of the aryl group represented by ^R8 include a phenyl group and a naphthyl group.
Examples of the aralkyl group represented by R ⁸ include a phenylmethyl group and a phenylethyl group.
The linear, branched or cyclic alkylene group represented by R ¹⁰ is the same as R ⁷ .

Y is preferably —R ⁷ O—, where R ⁷ is an aryl-substituted alkylene group, particularly a residue of a phenolic compound having an alkyl group, such as an organic residue derived from allylphenol or eugenol More preferred are organic residues derived from
For p and q in formula (II-II), it is preferred that p=q.
In addition, 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, represented by any of the following general formulas (iii) to (vii) and a divalent group.

The average number of repetitions of the polyorganosiloxane block (A-2) in the PC-POS copolymer (A) (the number represented by n−1 and p and q in the above formula) is 85 or more and 95 or less. When the average repetition number is 85 or more, the impact resistance can be improved. On the other hand, when the average repetition number is 95 or less, the transparency can be improved. From the viewpoint of obtaining higher impact resistance, the average repetition number is preferably 86 or more, more preferably 87 or more, and preferably 93 or less, more preferably 90 or less. The average repetition number is calculated by nuclear magnetic resonance (NMR) measurement.

The PC-POS copolymer (A) contains 5.0% by mass or more and 7.0% by mass or less of the polyorganosiloxane block (A-2). When the amount of polyorganosiloxane in the PC-POS copolymer (A) is within the above range, the balance between impact resistance and transparency can be improved.
The content of the polyorganosiloxane block (A-2) in the PC-POS copolymer (A) is preferably 5.5% by mass or more from the viewpoint of obtaining higher impact resistance, and higher transparency. is preferably less than 7.0% by mass, more preferably 6.5% by mass or less. The content is calculated by nuclear magnetic resonance (NMR) measurement.

The PC-POS copolymer (A) has a viscosity average molecular weight (Mv) of 16,000 or more and 18,000 or less. When the viscosity-average molecular weight of the PC-POS copolymer (A) is within the above range, the strength of the molded product can be improved, or heat deterioration during injection molding or extrusion molding can be suppressed. By using a molecular weight modifier (terminal terminator) or the like, the viscosity average molecular weight can be adjusted within the above range.

The viscosity-average molecular weight of the PC-POS copolymer (A) is preferably 16,500 or more from the viewpoint of obtaining a molded article having higher strength, and from the viewpoint of further suppressing thermal deterioration during molding, preferably less than 18,000.
The viscosity-average molecular weight (Mv) is a value calculated from the following Schnell's formula by measuring the intrinsic viscosity [η] of a methylene chloride solution at 20°C.

The PC-POS copolymer (A) can be produced by known production methods such as an interfacial polymerization method (phosgene method), a pyridine method, and a transesterification method. In particular, when the interfacial polymerization method is employed, the separation process between the organic phase containing the PC-POS copolymer (A) and the aqueous phase containing unreacted substances, catalyst residues, etc. is easy, and alkali washing and acid washing are performed. It is easy to separate the organic phase containing the PC-POS copolymer (A) from the aqueous phase in each washing step such as washing with pure water. Therefore, the PC-POS copolymer (A) can be obtained efficiently. As a method for producing the PC-POS copolymer (A), for example, the method described in JP-A-2014-80462 can be referred to.

Specifically, a pre-produced polycarbonate oligomer and polyorganosiloxane, which will be described later, are dissolved in a water-insoluble organic solvent (methylene chloride, etc.), and an alkaline compound aqueous solution (bisphenol A, etc.) of a dihydric phenol compound (bisphenol A, etc.) sodium hydroxide aqueous solution, etc.), using a tertiary amine (triethylamine, etc.) or a quaternary ammonium salt (trimethylbenzylammonium chloride, etc.) as a polymerization catalyst, a terminal terminator (monohydric phenol such as p-tert-butylphenol ), it can be produced by an interfacial polycondensation reaction. The PC-POS copolymer (A) can also be produced by copolymerizing polyorganosiloxane, dihydric phenol, phosgene, carbonate or chloroformate.

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

In the above formula, R ³ to 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 atom or a halogen atom, and multiple Z's may be the same or different.

For example, polyorganosiloxane represented by general formula (1) includes compounds represented by general formulas (1-1) to (1-11) below.

In general formulas (1-1) to (1-11) above, R ³ to R ⁶ , n-1 and R ⁸ are as defined above, and the preferred ones are also the same. c represents a positive integer, usually an integer of 1-6.
Among these, the phenol-modified polyorganosiloxane represented by the general formula (1-1) is preferable from the viewpoint of ease of polymerization. From the viewpoint of ease of availability, α,ω-bis[3-(o-hydroxyphenyl)propyl]polydimethylsiloxane, which is one of the compounds represented by the general formula (1-2), α,ω-bis[3-(4-hydroxy-3-methoxyphenyl)propyl]polydimethylsiloxane, which is one of the compounds represented by (1-3), is preferred.

In addition, one having the following general formula (4) may be used as the polyorganosiloxane raw material.

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

［式中のＲ^３、Ｒ^４、ｒ及びｍは上述した通りである。］

[R ³ , R ⁴ , r and m in the formula are as described above. ]

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

［式中、Ｒ^１８～Ｒ^２１はそれぞれ独立に水素原子又は炭素数１～１３のアルキル基である。Ｒ^２２は炭素数１～６のアルキル基、水素原子、ハロゲン原子、ヒドロキシ基、炭素数１～６のアルコキシ基、又は炭素数６～１４のアリール基である。Ｑ^２は炭素数１～１０の２価の脂肪族基である。ｎ－１はポリオルガノシロキサンブロックの繰り返し数を示し、その範囲は上記した通りである。］

[In the formula, R ¹⁸ to R ²¹ are each independently a hydrogen atom or an alkyl group having 1 to 13 carbon atoms. R 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. Q ² is a divalent aliphatic group having 1 to 10 carbon atoms. n-1 represents the number of repeating polyorganosiloxane blocks, and its range is as described above. ]

In general formula (II-V), examples of alkyl groups having 1 to 13 carbon atoms independently represented by R ¹⁸ to R ²¹ include methyl group, ethyl group, n-propyl group, isopropyl group and various butyl groups. , various pentyl groups, various hexyl groups, various heptyl groups, various octyl groups, 2-ethylhexyl groups, various nonyl groups, various decyl groups, various undecyl groups, various dodecyl groups, various tridecyl groups, and the like. Among these, R ¹⁸ to R ²¹ are preferably a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and more preferably a methyl group.

The alkyl group having 1 to 6 carbon atoms represented by R ²² includes methyl group, ethyl group, n-propyl group, isopropyl group, various butyl groups, various pentyl groups and various hexyl groups. The halogen atom represented by R ²² includes, for example, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom and the like. Examples of the alkoxy group having 1 to 6 carbon atoms represented by R ²² include cases where the alkyl group moiety is the above alkyl group. The aryl group having 6 to 14 carbon atoms represented by R ²² includes, for example, a phenyl group, a toluyl group, a dimethylphenyl group, a naphthyl group and the like.
Among the above, R ²² is preferably 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 still more preferably a hydrogen atom.

The divalent aliphatic group having 1 to 10 carbon atoms represented by Q ² is preferably a linear or branched divalent saturated aliphatic group having 1 to 10 carbon atoms. The saturated aliphatic group preferably has 1 to 8 carbon atoms, more preferably 2 to 6 carbon atoms, still more preferably 3 to 6 carbon atoms, and still more preferably 4 to 6 carbon atoms. The repetition number n-1 is as described above.

Preferred embodiments of the structural unit (II-V) include structures represented by the following formulas (II-VI).

［式中、ｎ－１は前記と同じである。］

[In the formula, n−1 is the same as described above. ]

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

［式中、Ｒ^１８～Ｒ^２２、Ｑ^２、及びｎ－１は上記した通りである。］

[In the formula, R ¹⁸ to R ²² , Q ² and n−1 are as described above. ]

［式中、ｎ－１は上記した通りである。］

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

The method for producing the polyorganosiloxane is not particularly limited. For example, according to the method described in JP-A-11-217390, cyclotrisiloxane and disiloxane are reacted in the presence of an acidic catalyst to synthesize α,ω-dihydrogenorganopentasiloxane, followed by A phenolic compound (eg, 2-allylphenol, 4-allylphenol, eugenol, 2-propenylphenol, etc.) is added to the α,ω-dihydrogenorganopentasiloxane in the presence of a hydrosilylation reaction catalyst. Thus, a crude polyorganosiloxane can be obtained. Further, according to the method described in Japanese Patent No. 2662310, octamethylcyclotetrasiloxane and tetramethyldisiloxane are reacted in the presence of sulfuric acid (acidic catalyst) to obtain α,ω-dihydrogenorgano A crude polyorganosiloxane can be obtained by subjecting a polysiloxane to an addition reaction with a phenolic compound or the like in the presence of a hydrosilylation reaction catalyst in the same manner as described above. The α,ω-dihydrogenorganopolysiloxane may be used by appropriately adjusting its chain length n depending on the polymerization conditions, or commercially available α,ω-dihydrogenorganopolysiloxane may be used. Specifically, as the hydrosilylation catalyst, those described in JP-A-2016-098292 can be used.

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 or chloroform. When producing a polycarbonate oligomer using a transesterification method, it 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).

［式中、Ｒ^１、Ｒ^２、ａ、ｂ及びＸは上述した通りである。］

[In the formula, R ¹ , R ² , a, b and X are as described above. ]

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

Examples of dihydric phenols other than bisphenol A include bis(hydroxyaryl)alkanes, bis(hydroxyaryl)cycloalkanes, dihydroxyaryl ethers, dihydroxydiarylsulfides, dihydroxydiarylsulfoxides, dihydroxydiarylsulfones, dihydroxy diphenyls, dihydroxydiarylfluorenes, dihydroxydiaryladamantanes, and the like. These dihydric phenols may be used singly or in combination of two or more.

Bis(hydroxyaryl)alkanes include, for example, 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-dibromophenyl)propane and the like.

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 and the like. Examples of dihydroxyaryl ethers include 4,4'-dihydroxydiphenyl ether and 4,4'-dihydroxy-3,3'-dimethylphenyl ether.

Examples of dihydroxydiarylsulfides include 4,4'-dihydroxydiphenylsulfide and 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfide. Dihydroxydiarylsulfoxides include, for example, 4,4'-dihydroxydiphenylsulfoxide and 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfoxide. Examples of dihydroxydiarylsulfones include 4,4'-dihydroxydiphenylsulfone and 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfone.

Dihydroxydiphenyls include, for example, 4,4'-dihydroxydiphenyl. Examples of dihydroxydiarylfluorenes include 9,9-bis(4-hydroxyphenyl)fluorene and 9,9-bis(4-hydroxy-3-methylphenyl)fluorene. Examples of dihydroxydiaryladamantanes include 1,3-bis(4-hydroxyphenyl)adamantane, 2,2-bis(4-hydroxyphenyl)adamantane, 1,3-bis(4-hydroxyphenyl)-5,7 - dimethyladamantane and the like.

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

A terminal terminator (molecular weight modifier) can be used to adjust the molecular weight of the resulting PC-POS copolymer (A). Examples of terminal terminator include phenol, p-cresol, p-tert-butylphenol, p-tert-octylphenol, p-cumylphenol, p-nonylphenol, m-pentadecylphenol and p-tert-amylphenol. Mention may be made of monohydric phenols. These monohydric phenols may be used singly or in combination of two or more.

After the interfacial polycondensation reaction, the aqueous phase and the organic solvent phase are separated by standing appropriately [separation step], and the organic solvent phase is washed (preferably washed with a basic aqueous solution, an acidic aqueous solution, and water in this order) [washing step]. ], and the obtained organic phase is concentrated [concentration step] and dried [drying step] to obtain the PC-POS copolymer (A) according to the present invention.

<Polycarbonate resin (A')>
The polycarbonate-based resin (A') is a polycarbonate-based resin other than the PC-POS copolymer (A), and the main chain is composed of repeating units represented by the following general formula (III). As the polycarbonate-based resin, various known polycarbonate-based resins can be used without any particular limitation.

［式中、Ｒ^３０及びＲ^３１は、それぞれ独立に、ハロゲン原子、炭素数１～６のアルキル基又は炭素数１～６のアルコキシ基を示す。Ｘ’は単結合、炭素数１～８のアルキレン基、炭素数２～８のアルキリデン基、炭素数５～１５のシクロアルキレン基、炭素数５～１５のシクロアルキリデン基、－Ｓ－、－ＳＯ－、－ＳＯ_２－、－Ｏ－又は－ＣＯ－を示す。ｄ及びｅは、それぞれ独立に０～４の整数を示す。］

[In the formula, R ³⁰ and R ³¹ each 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' is 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, -S-, -SO -, -SO ₂ -, -O- or -CO-. d and e each independently represent an integer of 0 to 4; ]

Specific examples of the groups represented by R ³⁰ and R ³¹ are the same as those for R ¹ and R ² above, and the preferred groups are also the same. R ³⁰ and R ³¹ more preferably represent an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms. Specific examples of X' are the same as those of X above, and the preferred ones are also the same. d and e are each independently preferably 0 to 2, more preferably 0 or 1, still more preferably 0.

Specifically, the polycarbonate-based resin (A′) is prepared by reacting a dihydric phenol-based compound and phosgene in the presence of an organic solvent inert to the reaction and an alkaline aqueous solution, followed by a tertiary amine or The interfacial polymerization method, in which a polymerization catalyst such as a quaternary ammonium salt is added for polymerization, or the pyridine method, in which a dihydric phenolic compound is dissolved in pyridine or a mixed solution of pyridine and an inert solvent, and phosgene is introduced for direct production. , etc., which can be obtained by a conventional method for producing a polycarbonate can be used.
In the above reaction, if necessary, a molecular weight modifier (terminal terminator), a branching agent and the like are used. Examples of dihydric phenol compounds include those represented by the following general formula (III').

［式中、Ｒ^３０、Ｒ^３１、Ｘ’、ｄ及びｅは前記定義の通りであり、好ましいものも同じである。］

[In the formula, R ³⁰ , R ³¹ , X′, d and e are as defined above, and preferred ones are also the same. ]

Specific examples of the dihydric phenol compound include those described in the method for producing the PC-POS copolymer (A), and the preferred ones are also the same. Among them, bis(hydroxyphenyl)alkane-based dihydric phenols are preferred, and bisphenol A is more preferred.
The polycarbonate-based resin (A') may be used alone or in combination of two or more. Unlike the PC-POS copolymer (A), the polycarbonate resin (A') does not have a polyorganosiloxane block represented by formula (II). Polycarbonate resin may be used.

The polycarbonate-based resin (S) contains 55% by mass or more and 70% by mass or less of the PC-POS copolymer (A). When the amount of the PC-POS copolymer (A) in the polycarbonate resin (S) is 55% by mass or more, better impact resistance can be obtained. When the amount of the PC-POS copolymer (A) in the polycarbonate resin (S) is 70% by mass or less, the transparency of the obtained resin composition can be improved. From the viewpoint of obtaining better impact resistance and transparency, the content is preferably 58% by mass or more, more preferably 60% by mass or more, preferably less than 70% by mass, and more preferably 65% by mass or less.

The content of the polycarbonate-based resin (A') in the polycarbonate-based resin (S) corresponds to the remainder obtained by removing the PC-POS copolymer (A) from 100% by mass of the polycarbonate-based resin (S).

The polycarbonate-based resin (S) contains 3.0% by mass or more and 4.0% by mass or less of the polyorganosiloxane block (A-2). When the content of the polyorganosiloxane block (A-2) in the polycarbonate resin (S) is within the above range, it is possible to achieve both excellent impact resistance and transparency.
The content of the polyorganosiloxane block (A-2) in the polycarbonate resin (S) is preferably 3.3% by mass or more, more preferably 3.5% by mass or more, from the viewpoint of obtaining higher impact resistance. and preferably 3.9% by mass or less from the viewpoint of obtaining more excellent transparency. The content is calculated by nuclear magnetic resonance (NMR) measurement.

The viscosity-average molecular weight (Mv) of the polycarbonate-based resin (S) is 15,000 or more and 17,000 or less. When the viscosity-average molecular weight of the polycarbonate-based resin (S) is within the above range, the strength of the molded article is improved, or heat deterioration during injection molding or extrusion molding can be suppressed, which is preferable. By using a molecular weight modifier (terminal terminator) or the like, the viscosity average molecular weight can be adjusted within the above range. The viscosity-average molecular weight of the polycarbonate-based resin (S) is preferably 15,000 or more and 16,500 or less. If the viscosity-average molecular weight is within the above range, the strength of the molded product will be more excellent, and thermal deterioration during injection molding or extrusion molding will be more suppressed. The viscosity-average molecular weight of the polycarbonate-based resin (S) is more preferably 15,500 or more from the viewpoint of obtaining a molded article having higher strength, and more preferably 16 from the viewpoint of further suppressing thermal deterioration during molding. , 500. The viscosity-average molecular weight (Mv) is a value measured in the same manner as described for the PC-POS copolymer (A), that is, the intrinsic viscosity [η] of a methylene chloride solution at 20°C is measured, and the following Schnell formula It is a value calculated from

[Metal aluminum particles (B)]
The polycarbonate-based resin composition according to the present invention contains 0.10 parts by mass or more and 0.30 parts by mass or less of the metal aluminum particles (B) with respect to 100 parts by mass of the polycarbonate-based resin (S).
When the content of the metal aluminum particles (B) is 0.10 parts by mass or more with respect to 100 parts by mass of the polycarbonate resin (S), the difference in brightness between the highlight part and the shade part in the metallic appearance is improved. can be done. When the content of the metal aluminum particles (B) is 0.30 parts by mass or less, a decrease in impact resistance can be suppressed.
The metallic aluminum particles (B) can be incorporated into the polycarbonate-based resin composition by incorporating the metallic aluminum particles (B) or by incorporating an aluminum paste containing the metallic aluminum particles (B).
The content of the metallic aluminum particles (B) in the polycarbonate-based resin composition according to the present invention can be measured by the ICP emission spectroscopic analysis method described in Examples.

The content of the metal aluminum particles (B) is preferably 0.12 parts by mass with respect to 100 parts by mass of the polycarbonate resin (S) from the viewpoint of further improving the difference in brightness between the highlight part and the shade part in the metallic appearance. Above, more preferably 0.14 parts by mass or more, still more preferably 0.18 parts by mass or more, still more preferably 0.20 parts by mass or more, and from the viewpoint of further suppressing a decrease in impact resistance, preferably 0.20 parts by mass or more. 28 parts by mass or less, more preferably 0.27 parts by mass or less, still more preferably 0.25 parts by mass or less, and even more preferably 0.24 parts by mass or less.

In addition, from the viewpoint of further improving the brightness difference between the highlight part and the shade part in the metallic appearance, the content of the metal aluminum particles (B) is, with respect to 100 parts by mass of the polycarbonate-polyorganosiloxane copolymer (A) Preferably 0.20 parts by mass or more, more preferably 0.25 parts by mass or more, still more preferably 0.27 parts by mass or more, still more preferably 0.30 parts by mass or more, still more preferably 0.35 parts by mass or more , preferably 0.50 parts by mass or less, more preferably 0.45 parts by mass or less, and even more preferably 0.40 parts by mass or less, from the viewpoint of further suppressing a decrease in impact resistance.

As used herein, metallic aluminum particles mean particles made of at least one kind of metallic aluminum selected from the group consisting of simple aluminum and aluminum alloys, such as aluminum oxide, aluminum sulfide, aluminum hydroxide, and aluminum nitride. Particles consisting of aluminum compounds such as solids are excluded.
The content of metal aluminum particles (B) means the content of particles made of at least one kind of metal aluminum selected from the group consisting of simple aluminum and aluminum alloys.
The polycarbonate-based resin composition according to the present invention may contain particles made of an aluminum compound such as aluminum oxide, aluminum sulfide, aluminum hydroxide, and aluminum nitride within a range that does not impair the effects of the present invention. The content of the particles made of the aluminum compound is preferably less than 0.30 parts by mass, more preferably less than 0.20 parts by mass, and still more preferably 0.10 parts by mass with respect to 100 parts by mass of the polycarbonate resin composition. less than, preferably less than 0.05 parts by mass, more preferably less than 0.005 parts by mass, still more preferably less than 0.001 parts by mass, and more preferably does not contain particles composed of the aluminum compound.
Metal aluminum particles (B) and particles made of aluminum compounds such as aluminum oxide, aluminum sulfide, aluminum hydroxide, and aluminum nitride can be analyzed separately by, for example, an electron probe microanalyzer (EPMA). It is possible.

[Ultraviolet absorber (C)]
The polycarbonate-based resin composition of the present invention contains 0.10 parts by mass or more and 0.50 parts by mass or less of the ultraviolet absorber (C) with respect to 100 parts by mass of the polycarbonate-based resin (S). Weather resistance can be made favorable as content of the ultraviolet absorber (C) in a composition is 0.10 mass part or more. When the content of the ultraviolet absorber (C) is 0.50 parts by mass or less, contamination of the mold during molding can be suppressed. The amount of the ultraviolet absorber (C) is preferably 0.20 parts by mass or more and preferably 0.40 parts by mass or less with respect to 100 parts by mass of the polycarbonate resin (S).

Examples of the ultraviolet absorber (C) include benzotriazole-based ultraviolet absorbers, benzoxazinone-based ultraviolet absorbers, salicylate-based ultraviolet absorbers, malonic acid ester-based ultraviolet absorbers, oxalylalanide-based ultraviolet absorbers, and triazine-based ultraviolet absorbers. UV absorbers, benzophenone-based UV absorbers, cyanoacrylate-based UV absorbers, and the like can be mentioned. These can be used individually by 1 type or in combination of 2 or more types. As the ultraviolet absorber (C), a benzotriazole-based ultraviolet absorber is preferable from the viewpoint of weather resistance.
The type and content of the ultraviolet absorber (C) in the polycarbonate-based resin composition according to the present invention can be measured by gas chromatography (GC or GC-MS).

Examples of benzotriazole-based UV absorbers include 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-5'-tert-butylphenyl)benzotriazole, 2-( 2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole, 2-(2'-hydroxy-3' ,5′-diamylphenyl)benzotriazole, 2-(2′-hydroxy-3′-dodecyl-5′-methylphenyl)benzotriazole, 2-(2′-hydroxy-3′,5′-dicumylphenyl ) benzotriazole, 2,2′-methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol] and the like, and 2,2′ -methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol] is preferred.

[Other additives]
The polycarbonate-based resin composition according to the present invention contains, in addition to the polycarbonate-based resin (S), the metal aluminum particles (B), and the ultraviolet absorber (C), other components described below that impair the effects of the present invention. may be included unless Other components include an antioxidant, a release agent, a reinforcing material, a filler other than the metal aluminum particles (B), an elastomer for improving impact resistance, a colorant other than the metal aluminum particles (B), an antistatic agent, Glossy particles other than metal aluminum particles (B), resins other than polycarbonate-based resins, and the like can be used. Some additives are more specifically described below.

[Coloring agent]
As the coloring agent, those having no hiding property are preferable, and dyes and pigments can be used. Examples of dyes include methine dyes, pyrazolone dyes, perinone dyes, azo dyes, quinophthalone dyes, and anthraquinone dyes. Examples of pigments include inorganic pigments, organic pigments, mixtures of organic pigments having complementary colors, mixtures of organic pigments of three primary colors, and mixtures of organic pigments having complementary colors. Examples of inorganic pigments include black pigments such as carbon black (grades MT, FT, SRF, GPF, FET, HAF, ISAF, SAF, MPC, etc.), chromium (Cr), nickel (Ni), copper (Cu), praseodymium ( Pr), platinum, ruthenium, titanium and other metals, and their oxides. Examples of white pigments include titanium oxide, zinc oxide, lithopone, zinc sulfide, white lead, and the like.

Mixture of organic pigments of primary colors Examples of organic pigments of three primary colors include red (R) perylene-based pigments, lake pigments, azo-based pigments, quinacridone-based pigments, anthraquinone-based pigments, anthracene-based pigments, azo-based pigments, and isoindoline-based pigments. , isoindolinone-based pigments, etc. alone or as a mixture of at least two of them. For green (G), single or at least two types of multi-halogen phthalocyanine pigments, multi-halogen copper phthalocyanine pigments, triphenylmethane basic dyes, azo pigments, isoindoline pigments, isoindolinone pigments, etc. Mixtures of the above may be mentioned. Blue (B) includes copper phthalocyanine-based pigments, indanthrone-based pigments, indophenol-based pigments, cyanine-based pigments, and dioxazine-based pigments, either singly or as a mixture of at least two of them. Mixtures of these three primary colors can be used.

Examples of mutually complementary colors in the mixture of complementary organic pigments include combinations of red and cyanine, blue, green and magenta, purple, and blue and yellow. Specific examples of individual colors include, in addition to the above three primary colors, disazo-based pigments, isoindoline-based pigments, and isoindolinone-based pigments for yellow, and dioxandine-based pigments for purple. A mixture of these organic pigments having a complementary relationship is used.

In the polycarbonate-based resin composition according to the present invention, from the viewpoint of improving the transparency and further improving the brightness difference between the highlight part and the shade part in the metallic appearance, the content of the coloring agent other than the metal aluminum particles (B) is preferably 0.05 parts by mass or less, more preferably 0.03 parts by mass or less, and further preferably 0.02 parts by mass or less with respect to 100 parts by mass of the polycarbonate resin (S) preferable.

In the polycarbonate-based resin composition according to the present invention, from the viewpoint of improving the transparency and further improving the brightness difference between the highlight part and the shade part in the metallic appearance, the content of titanium oxide is adjusted to the polycarbonate-based resin (S). With respect to 100 parts by mass, it is preferably 0.05 parts by mass or less, more preferably 0.03 parts by mass or less, further preferably 0.01 parts by mass or less, and 0.001 parts by mass or less. More preferably, the polycarbonate-based resin composition according to the present invention does not contain titanium oxide.

[Filler]
Examples of fillers include inorganic fillers such as talc, mica, clay, wollastonite, bentonite, glass fiber, magnesium hydroxide, calcium hydroxide, aluminum hydroxide, hydrotalcite, magnesium oxide, calcium oxide, and calcium carbonate and the like can be preferably used.

In the polycarbonate resin composition according to the present invention, from the viewpoint of further suppressing the decrease in impact resistance and elongation, the content of the inorganic filler other than the metal aluminum particles (B) is set to 100 parts by mass of the polycarbonate resin (S). On the other hand, it is preferably 5.0 parts by mass or less, more preferably 1.0 parts by mass or less, further preferably 0.5 parts by mass or less, and preferably 0.1 parts by mass or less. More preferably, the polycarbonate-based resin composition according to the present invention does not contain inorganic fillers other than the metal aluminum particles (B).
Here, in the present specification, the inorganic filler excludes those corresponding to the aforementioned colorant and metal aluminum particles (B).

In the polycarbonate resin composition according to the present invention, from the viewpoint of further suppressing the decrease in impact resistance and elongation, the content of the glass fiber is 5.0 parts by mass or less with respect to 100 parts by mass of the polycarbonate resin (S). is preferably 1.0 parts by mass or less, more preferably 0.5 parts by mass or less, even more preferably 0.1 parts by mass or less, the polycarbonate according to the present invention More preferably, the resin composition does not contain glass fibers.

[Antioxidant]
Phenolic antioxidants and phosphorus antioxidants can be preferably used as antioxidants.
Phenolic antioxidants include, for example, triethylene glycol-bis[3-(3-tert-butyl-5-methyl-4-hydroxyphenyl)propionate], 1,6-hexanediol-bis[3-(3 ,5-di-tert-butyl-4-hydroxyphenyl)propionate], pentaerythritol-tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl-3-(3, 5-di-tert-butyl-4-hydroxyphenyl)propionate, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, N, N-hexamethylenebis(3,5-di-tert-butyl-4-hydroxy-hydrocinnamide), 3,5-di-tert-butyl-4-hydroxybenzylphosphonate-diethyl ester, tris(3,5- Di-tert-butyl-4-hydroxybenzyl)isocyanurate, 3,9-bis[1,1-dimethyl-2-[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy] ethyl]-2,4,8,10-tetraoxaspiro(5.5)undecane and the like.

Phosphorus antioxidants include, for example, triphenylphosphite, trisnonylphenylphosphite, tris(2,4-di-tert-butylphenyl)phosphite, tridecylphosphite, trioctylphosphite, trioctadecylphosphite Phyto, didecylmonophenylphosphite, dioctylmonophenylphosphite, diisopropylmonophenylphosphite, monobutyldiphenylphosphite, monodecyldiphenylphosphite, monooctyldiphenylphosphite, bis(2,6-di-tert-butyl -4-methylphenyl)pentaerythritol diphosphite, 2,2-methylenebis(4,6-di-tert-butylphenyl)octylphosphite, bis(nonylphenyl)pentaerythritol diphosphite, bis(2,4- di-tert-butylphenyl)pentaerythritol diphosphite, distearylpentaerythritol diphosphite and the like. Among these, tris(2,4-di-tert-butylphenyl)phosphite is preferred.
These antioxidants may be used individually by 1 type, and may be used in combination of 2 or more types. The amount of the antioxidant to be added is preferably 0.05 to 1.0 parts by mass with respect to 100 parts by mass of the polycarbonate resin (S). If the antioxidant is within the above range, higher flame retardancy can be obtained. From this point of view, the amount of antioxidant added is more preferably 0.08 parts by mass or more, more preferably 0.50 parts by mass or less, still more preferably 0.30 parts by mass or less, and still more preferably 0.15 parts by mass. Part by mass or less.

[Glossy particles]
In the polycarbonate resin composition according to the present invention, from the viewpoint of further improving the luminance difference between the highlight part and the shade part in the metallic appearance while further suppressing the decrease in impact resistance, metal aluminum particles other than (B) The content of the glossy particles is preferably 0.005 parts by mass or less, more preferably 0.001 parts by mass or less, relative to 100 parts by mass of the polycarbonate resin (S). More preferably, the resin composition does not contain glossy particles other than the metallic aluminum particles (B).
Here, in the present specification, glossy particles other than the metallic aluminum particles (B) include mica, metallic particles, metallic sulfide particles, particles whose surfaces are coated with metal or metal oxide, and particles whose surfaces are coated with metal or metal oxide. Mention may be made of glass flakes coated with material. Each of these may be used alone, or two or more thereof may be used in combination.
Specific examples of metal particles include powders of metals such as aluminum, gold, silver, copper, nickel, titanium, and stainless steel, and specific examples of particles whose surfaces are coated with a metal or metal oxide include titanium oxide. Titanium mica, mica-based metal oxide film such as mica coated with bismuth trichloride, specific examples of metal sulfide particles include metal sulfide powders such as nickel sulfide, cobalt sulfide, manganese sulfide, and surface Examples of the metal used for the glass flakes coated with a metal or metal oxide include gold, silver, platinum, palladium, nickel, copper, chromium, tin, titanium, and silicon.
Here, in the present specification, the glossy particles exclude those corresponding to the aforementioned colorant, inorganic filler, and metallic aluminum particles (B).

[Polymethyl methacrylate resin]
In the polycarbonate-based resin composition according to the present invention, the content of the polymethyl methacrylate resin is 5.0 parts by mass or less with respect to 100 parts by mass of the polycarbonate-based resin (S) from the viewpoint of further suppressing the decrease in impact resistance. is preferably 1.0 parts by mass or less, more preferably 0.5 parts by mass or less, even more preferably 0.1 parts by mass or less, the polycarbonate according to the present invention More preferably, the system resin composition does not contain polymethyl methacrylate resin.
Here, in this specification, polymethyl methacrylate resin means a homopolymer of methyl methacrylate, or a resin containing methyl methacrylate as a main component, and other vinyl monomers such as acrylic acid esters and other methacrylic acid esters. , styrene, acrylonitrile, and the like.

The polycarbonate-based resin composition according to the present invention is obtained by blending each of the above-described components in the above-mentioned proportions, and further optionally various optional components in appropriate proportions, and kneading the mixture.
In one aspect of the present invention, the total content of the polycarbonate resin (S), the metal aluminum particles (B) and the ultraviolet absorber (C) is based on the total amount (100% by mass) of the polycarbonate resin composition, preferably 80 to 100% by mass, more preferably 95 to 100% by mass, still more preferably 97 to 100% by mass, still more preferably 98 to 100% by mass, still more preferably 99 to 100% by mass.

Blending and kneading can be carried out by methods using commonly used equipment. For example, compounding and kneading are performed by pre-mixing with a ribbon blender, drum tumbler, etc., and using a Henschel mixer, Banbury mixer, single screw extruder, twin screw extruder, multi-screw extruder, co-kneader, etc. be able to. The heating temperature during kneading is usually appropriately selected within the range of 240° C. or higher and 320° C. or lower. For this melt-kneading, it is preferable to use an extruder, particularly a vent-type extruder.

2. Molded Article The molded article according to the present invention is made of the polycarbonate-based resin composition according to the present invention.
The molded article according to the present invention can be produced by using the melt-kneaded polycarbonate resin composition of the present invention or the pellets obtained after melt-kneading as a raw material by an injection molding method, an injection compression molding method, an extrusion molding method, a blow molding method, a press molding method, or a It can be produced by a molding method, a vacuum molding method, a foam molding method, or the like. In particular, the polycarbonate-based resin composition according to the present invention can be suitably used for the production of injection molded articles by injection molding and injection compression molding using pellets obtained by melt-kneading.

The molded article according to the present invention may be subjected to texturing or the like in order to further enhance designability. For example, the molding surface of the mold at the time of injection molding is subjected to texture processing that reproduces the grain pattern (unevenness) by chemical corrosion (etching), and a polycarbonate resin composition is injected into this mold to form the surface of the molded product. By transferring a three-dimensional grain pattern, the grain processing can be performed.
By applying texturing to the molded body according to the present invention, the light incident on the top surface of the geometric texture is reflected in various directions by reflection and scattering at the uneven portions, so that the surface of the molded body is bright as a whole. This is preferable because it makes the black line more difficult to see.
The height of the unevenness in texturing is not particularly limited, but can be, for example, 5 μm or more and 700 μm or less. When the unevenness height of the uneven pattern is within the above range, the visibility of the uneven pattern is excellent and it is easy to form a fine pattern rich in design, which is preferable. More specifically, the height of the unevenness is more preferably 10 μm or more and 350 μm or less.

The molded article according to the present invention may be two-color molded. In that case, the polycarbonate-based resin composition according to the present invention shall be injected on at least one of the primary side and the secondary side.
Since the molded article according to the present invention suppresses appearance defects such as black lines and has excellent impact resistance, it can be suitably used as housings for parts for electric and electronic devices, parts for automobiles and building materials, and the like. It can be used more preferably as an automobile interior part.

The present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. Characteristic values and evaluation results in each example were determined according to the following procedures.

(1) Polydimethylsiloxane chain length and content It was calculated from the integral value ratio of methyl groups of polydimethylsiloxane by NMR measurement. In this specification, polydimethylsiloxane may be abbreviated as PDMS.
<Method for quantifying chain length of polydimethylsiloxane>
¹ H-NMR measurement conditions NMR equipment: ECA-500 manufactured by JEOL RESONANCE Co., Ltd.
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: heavy chloroform Measurement temperature: 23°C
Accumulation times: 256 times For allylphenol-terminated polydimethylsiloxane A: Integrated value of methyl group in dimethylsiloxane moiety observed around δ-0.02 to 0.5 B: Observed around δ 2.50 to 2.75 Integral value of methylene group of allylphenol obtained Chain length of polydimethylsiloxane = (A/6)/(B/4)
In the case of eugenol-terminated polydimethylsiloxane A: Integrated value of methyl group of dimethylsiloxane part observed around δ-0.02 to 0.5 B: Methylene group of eugenol observed around δ 2.40 to 2.70 Integral value Chain length of polydimethylsiloxane = (A/6)/(B/4)

<Method for quantifying polydimethylsiloxane content>
Method for quantifying the amount of polydimethylsiloxane copolymerized in PTBP-terminated polycarbonate copolymerized with allylphenol-terminated polydimethylsiloxane NMR equipment: ECA-500 manufactured by JEOL RESONANCE Co., Ltd.
Probe: 50TH5AT/FG2
Observation range: -5 to 15 ppm
Observation center: 5 ppm
Pulse repetition time: 9 seconds Pulse width: 45°
Number of times of integration: 256 times NMR sample tube: 5φ
Sample amount: 30-40mg
Solvent: heavy chloroform Measurement temperature: 23°C
A: Integral value of the methyl group of the BPA portion observed around δ1.5 to 1.9 B: Integral value of the methyl group of the dimethylsiloxane portion observed around δ-0.02 to 0.3 C: δ1 Integral value of the butyl group of the p-tert-butylphenyl moiety observed around .2 to 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 x 74.1/TW x 100

(2) Viscosity-average molecular weight The viscosity-average molecular weight (Mv) is obtained by measuring the viscosity of a methylene chloride solution at 20°C using an Ubbelohde viscometer, obtaining the intrinsic viscosity [η] from this, and calculating the following formula (Schnell's formula ).

(3) Method for Measuring Content of Metal Aluminum Particles (B) in Polycarbonate Resin Composition The content of metal aluminum particles (B) in the polycarbonate resin composition was measured by ICP emission spectrometry. The specific method was the following analysis.
0.04 g of a polycarbonate-based resin composition was placed in a platinum dish, and 0.2 mL of sulfuric acid was added thereto. Next, the platinum dish was heated while gradually raising the temperature from room temperature to 400° C. using a hot plate to carbonize the polycarbonate-based resin composition. Furthermore, after the polycarbonate-based resin composition was ashed in an electric furnace at 550° C. for 12 hours, it was allowed to cool, and 0.5 mL of hydrofluoric acid was added to a platinum dish. Subsequently, after performing heat dissolution treatment on a hot plate to dissolve the residue, drying treatment was performed by heating to 300°C. After standing to cool, 2 mL of hydrochloric acid and about 2 to 5 mL of ultrapure water were added, covered with a platinum lid, and heat-treated at 80° C. for 30 to 60 minutes.
Then, after standing to cool, the solution in the platinum dish was fixed in a 10 mL volumetric flask, and the obtained solution was used for an ICP emission spectrometer (manufactured by Agilent Technologies, Agilent 5100 ICP-OES, software: ICP Expert), and the amount of aluminum was quantified by the calibration curve method. The content of the metal aluminum particles (B) in the polycarbonate-based resin composition was calculated from the obtained amount of aluminum, and the calculated value was used as the amount of the metal aluminum particles (B) in Table 1.

<Production example: Production of polycarbonate oligomer>
2000 ppm of sodium dithionite relative to bisphenol A (BPA) (later dissolved) was added to a 5.6% by weight aqueous sodium hydroxide solution. BPA was dissolved in this so that the BPA concentration was 13.5% by mass to prepare an aqueous sodium hydroxide solution of BPA.
40 L/hr of this sodium hydroxide aqueous solution of BPA, 15 L/hr of methylene chloride and 4.0 kg/hr of phosgene were continuously passed through a tubular reactor having an inner diameter of 6 mm and a tube length of 30 m. The tubular reactor had a jacket portion, and cooling water was passed through the jacket to keep the temperature of the reaction solution at 40°C or less. The reaction liquid discharged from the tubular reactor was continuously introduced into a baffled tank-type reactor having an internal volume of 40 L and equipped with swept-back blades. The reaction was carried out by adding 0.07 L/hr of a sodium hydroxide aqueous solution of 0.07 L/hr by mass, 17 L/hr of water, and 0.64 L/hr of a 1 mass % triethylamine aqueous solution. The reaction liquid overflowing from the tank-type reactor was continuously withdrawn and allowed to stand to separate and remove the aqueous phase, and the methylene chloride phase was collected.
The polycarbonate oligomer thus obtained had a concentration of 341 g/L and a chloroformate group concentration of 0.71 mol/L.

<Polycarbonate-polyorganosiloxane copolymer (A)>
15 L of the polycarbonate oligomer solution prepared in the above production example, 10.1 L of methylene chloride, and polydimethylsiloxane having an average chain length n of 88 were placed in a 50 L tank-type reactor equipped with a baffle plate, a paddle-type stirring blade, and a cooling jacket. 407 g of o-allylphenol end-modified polydimethylsiloxane (PDMS) and 8.4 mL of triethylamine were charged, and 1065 g of an aqueous sodium hydroxide solution prepared by dissolving 85 g of sodium hydroxide in 980 mL of pure water was added thereto under stirring, followed by 20 minutes with a polycarbonate oligomer. Reaction with allylphenol-terminated PDMS was performed.
In this polymerization solution, a methylene chloride solution of p-tert-butylphenol (PTBP) (70.4 g of PTBP dissolved in 1.0 L of methylene chloride), a sodium hydroxide aqueous solution of bisphenol A (618 g of sodium hydroxide and dithionite An aqueous solution prepared by dissolving 2.1 g of sodium in 9.0 L of pure water and dissolving 1093 g of bisphenol A) was 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. , the organic phase was isolated.
The methylene chloride solution of the PC-PDMS copolymer thus obtained was washed with 15% by volume of 0.03 mol/L sodium hydroxide aqueous solution and 0.2 mol/L hydrochloric acid in that order. Washing with pure water was repeated until the electric conductivity in the aqueous phase of the sample became 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 a PC-PDMS copolymer (A).
The PC-PDMS copolymer (A) thus obtained had a PDMS block portion content of 6.0% by mass, an average repeating number of PDMS block portions of 90, and a viscosity-average molecular weight Mv of 17,700 as determined by NMR. rice field.

<Polycarbonate resin (A')>
Aromatic homopolycarbonate resin (A') [manufactured by Idemitsu Kosan Co., Ltd., Toughlon FN1500 (trade name), viscosity average molecular weight = 14,200]
Aromatic homopolycarbonate resin (A'') [manufactured by Idemitsu Kosan Co., Ltd., Toughlon FN1700 (trade name), viscosity average molecular weight = 17,700]
<Aluminum Paste (B') Containing Metal Aluminum Particles (B)>
M-45 (raw material code used within Sanyo Kako Co., Ltd., aluminum paste containing metallic aluminum particles consisting of a single aluminum component)
<Ultraviolet absorber (C)>
"LA-31RG (trade name)"[2,2'-methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol], Co., Ltd. Made by ADEKA]

<Other ingredients>
Antioxidant: "IRGAFOS 168 (trade name)" [tris (2,4-di-tert-butylphenyl) phosphite, manufactured by BASF Japan Ltd.]

Examples 1-2, Comparative Examples 1-3
PC-PDMS copolymer (A), aromatic homopolycarbonate resin (A'), aromatic homopolycarbonate resin (A''), aluminum paste (B'), ultraviolet absorber (C) and antioxidant are shown. 1 was mixed. The aluminum paste (B') was blended so that the proportion of metal aluminum particles (B) shown in Table 1 was obtained. Then, using a vented single-screw extruder with a screw diameter of 40 mm ("VS-40" manufactured by Tanabe Plastics Machinery Co., Ltd.), the mixture is melt-kneaded at a cylinder temperature of 260 ° C., and a polycarbonate-based resin composition is obtained by strand cutting. of pellets were obtained.
Here, the unit of the blending ratio in Table 1 is PC-PDMS copolymer (A), aromatic homopolycarbonate resin (A'), and aromatic homopolycarbonate resin (A'') are polycarbonate resin (S). is 100% by mass, and the metal aluminum particles (B), the ultraviolet absorber (C) and the antioxidant are parts by mass when the polycarbonate resin (S) is 100 parts by mass. .

[Evaluation test]
After drying the pellets obtained above at 100° C. for 5 hours, they were injection molded using an injection molding machine at a cylinder temperature of 280° C. and a mold of 80° C. to obtain desired test pieces necessary for the following evaluations. Using this test piece, luminous reflectance Y highlight/shade and Charpy impact strength were evaluated. The results are also shown in Table 1.

<Luminous Reflectance Y Highlight/Shade>
For a molded 3 mm thick test piece, using a three-dimensional spectrophotometer "DDC3000" (manufactured by Nippon Denshoku Industries Co., Ltd.), according to JIS Z8701: 1999, the light source incident angle -45 degrees, the reflection angle -40 ~ The luminous reflectance Y value at 70 degrees was measured. The difference between the Y value at a reflection angle of 30 degrees and the reflection angle of -30 degrees was defined as Y highlight/shade. The Y value was measured after calibrating the value of the standard white plate as 100%. Y highlight/shade of 25 or more was evaluated as "A", 20 or more and less than 25 as "B", and less than 20 as "C".

<Charpy impact strength>
The obtained pellets were injection molded under the conditions described above to obtain a Charpy test piece (4 mm thick). Using a test piece in which a notch (r = 0.25 mm ± 0.05 mm) was added to this test piece by post-processing, in accordance with ISO 179-1: 2010, a Charpy impact tester (manufactured by Toyo Seiki Seisakusho Co., Ltd. , Charpy impact tester, model 611) was used to measure the Charpy impact strength at 23°C. "A" when the Charpy impact strength is 20 kJ/ ^m2 or more, "B" when it is 15 kJ/ ^m2 or more and less than ²⁰ kJ/ ^m2 , and "C" when it is 10 kJ/ ^m2 or more and less than 15 kJ/m2 , less than 10 kJ/m ² was determined as "D".

From Table 1, it can be seen that the polycarbonate-based resin molded articles made of the polycarbonate-based resin compositions of Examples have higher impact resistance, a difference in brightness between the highlight portion and the shade portion in the metallic appearance, and a It can be understood that the balance of
In this example, the good balance between the impact resistance and the brightness difference between the highlight part and the shade part in the metallic appearance means that both the luminous reflectance Y highlight/shade and the Charpy impact strength are evaluated. Both refer to being "B" or higher.

Claims (4)

Polyorgano containing a polycarbonate block (A-1) consisting of a repeating unit represented by the following general formula (I), and a repeating unit represented by the following general formula (II) and having an average repeating number of 85 or more and 95 or less Polycarbonate resin (S ), and with respect to 100 parts by mass of the polycarbonate resin (S), 0.10 parts by mass or more and 0.30 parts by mass or less of metal aluminum particles (B) and 0.10 parts by mass or more and 0.50 parts by mass or less of ultraviolet rays including an absorbent (C),
The polycarbonate-polyorganosiloxane copolymer (A) contains 5.0% by mass or more and 7.0% by mass or less of the polyorganosiloxane block (A-2), and has a viscosity of 16,000 or more and 18,000 or less. having an average molecular weight,
The polycarbonate-based resin (S) contains 55% by mass or more and 70% by mass or less of the polycarbonate-polyorganosiloxane copolymer (A), and contains 3.0% by mass or more of the polyorganosiloxane block (A-2). A polycarbonate resin composition containing 0% by mass or less and having a viscosity average molecular weight of 15,000 or more and 17,000 or less.

[In the formula, R ¹ and R ² each 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 is 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, carbon represents an arylalkylene group having 7 to 15 carbon atoms, an arylalkylidene group having 7 to 15 carbon atoms, -S-, -SO-, -SO ₂ -, -O- or -CO-. R ³ and R ⁴ each 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. a and b each independently represents an integer of 0 to 4; ]

[In the formula, R ³⁰ and R ³¹ each 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' is 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, -S-, -SO -, -SO ₂ -, -O- or -CO-. d and e each independently represent an integer of 0 to 4; ] 2. The content of the metal aluminum particles (B) is 0.20 parts by mass or more and 0.50 parts by mass or less with respect to 100 parts by mass of the polycarbonate-polyorganosiloxane copolymer (A). Polycarbonate resin composition of. A molded article made of the polycarbonate-based resin composition according to claim 1 or 2. The molded article according to claim 3, which is an automobile interior part.