POLYCARBONATE RESIN COMPOSITION

• Main Author: MOGI ATSUSHI
• Format: Patent
• Language: English; Japanese
• Published: 22.08.2019
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

To provide a polycarbonate resin composition capable of blocking ultraviolet light as well as light in a wavelength of 400 to 420 nm closer to the visible light, while causing no problem of gas generation at the time of molding.SOLUTION: A polycarbonate resin composition contains, based on 100 pts.mass of a polycarbonate resin (A), (B1) a benzotriazole ultraviolet absorber of a specific structure having a sesamol group of 0.055-0.15 pts.mass, (B2) at least one ultraviolet absorber of 0.01-0.08 pts.mass selected from a benzotriazole ultraviolet absorber having no sesamol group, a triazine ultraviolet absorber, a malonate ultraviolet absorber, and a benzoxazine ultraviolet absorber, and a stabilizer (C) of 0.01-0.5 pts.mass, with the mass ratio between the contents of the ultraviolet absorbers (B2) and (B1) [(B2)/(B1)] of 0.2 or more and less than 1.SELECTED DRAWING: None 【課題】紫外光に加え、より可視光側の４００〜４２０ｎｍの波長光のカットが可能で、且つ、成形時のガス発生の問題がないポリカーボネート樹脂組成物を提供する。【解決手段】ポリカーボネート樹脂（Ａ）１００質量部に対し、セサモール基を有する特定の構造のベンゾトリアゾール系紫外線吸収剤（Ｂ１）を０．０５５〜０．１５質量部、セサモール基を有しないベンゾトリアゾール系紫外線吸収剤、トリアジン系紫外線吸収剤、マロン酸エステル系紫外線吸収剤、及びベンゾオキサジン系紫外線吸収剤から選ばれる少なくとも１種の紫外線吸収剤（Ｂ２）を０．０１〜０．０８質量部、安定剤（Ｃ）を０．０１〜０．５質量部含有し、前記紫外線吸収剤（Ｂ２）と（Ｂ１）の含有量の質量比（Ｂ２）／（Ｂ１）が０．２以上１未満であることを特徴とするポリカーボネート樹脂組成物。【選択図】なし