POLYCARBONATE-BASED RESIN COMPOSITION AND MOLDING

• Main Authors: ICHIHARA YOHEI, TSUCHIYA ATSUSHI
• Format: Patent
• Language: English; Japanese
• Published: 10.01.2023
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

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 【課題】耐衝撃性の低下を抑制しつつ、メタリック調外観におけるハイライト部及びシェード部の輝度差が向上した成形体を得ることができるポリカーボネート系樹脂組成物を提供する。【解決手段】［１］特定のポリカーボネートブロック（Ａ－１）及び特定のポリオルガノシロキサンブロック（Ａ－２）を含むポリカーボネート－ポリオルガノシロキサン共重合体（Ａ）と、特定のポリカーボネート樹脂（Ａ'）とからなるポリカーボネート系樹脂（Ｓ）、並びにポリカーボネート系樹脂（Ｓ）１００質量部に対し、０．１０質量部以上０．３０質量部以下の金属アルミニウム粒子（Ｂ）及び０．１０質量部以上０．５０質量部以下の紫外線吸収剤（Ｃ）を含み、前記共重合体（Ａ）は、ポリオルガノシロキサンブロック（Ａ－２）を５．０質量％以上７．０質量％以下含み、特定の粘度平均分子量を有し、ポリカーボネート系樹脂（Ｓ）は、前記共重合体（Ａ）を５５質量％以上７０質量％以下含み、ポリオルガノシロキサンブロック（Ａ－２）を３．０質量％以上４．０質量％以下含み、かつ特定の粘度平均分子量を有する、ポリカーボネート系樹脂組成物、並びに、［２］前記ポリカーボネート系樹脂組成物からなる成形体である。【選択図】なし