Polycarbonate molding materials containing graft rubber

US6890979B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Herbert Eichenauer · Dormagen, DE
• Thomas Eckel · Dormagen, DE
• Holger Warth · Sha Tin, CN
• Dieter Wittmann · Leverkusen, DE

Key dates

• Filing date: Feb 27, 2001
• Grant date: May 10, 2005
• Expiry date: May 20, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L55/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A thermoplastic molding composition having improved mechanical properties is disclosed. The composition contains (A) aromatic polycarbonate and/or polyester carbonate (B) at least one graft rubber, obtained by emulsion polymerization of styrene and acrylonitrile in the presence of at least two rubber latices of type (B1) and (B2) where (B1) has a particle diameter d50 of ≦350 nm, a particle size distribution range of 30 nm to 100 nm, and a gel content of 70 wt. %, and (B2) has a particle diameter of ≧350 nm, a particle size distribution range of 50 nm to 500 nm, and a gel content of ≧70 wt. %, and the difference in the average particle diameter of B1 and B2 is ≧50 nm, (C) an optional copolymer of styrene and or acrylonitrile and for methyl methacrylate and/or N-substituted maleinimide, and optionally (D) flame retardant as well as optionally conventional additives.