Polycarbonate/graft polymer moulding compositions with reduced deposit formation

US5994463A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Thomas Eckel · Dormagen, DE
• Dieter Wittmann · Leverkusen, DE
• Heinrich Alberts
• Bahman Sarabi · Krefeld, DE
• Herbert Eichenauer · Dormagen, DE
• Edgar Leitz · Dormagen, DE

Key dates

• Filing date: Mar 25, 1998
• Grant date: Nov 30, 1999
• Expiry date: Mar 25, 2018

Classification

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

Abstract

Thermoplastic polycarbonate/graft polymer moulding compositions containing PA0 A) 5 to 95 parts by weight of an aromatic polycarbonate, PA0 B) 1 to 50 parts by weight of at least one thermoplastic homopolymer, copolymer or terpolymer of styrene, .alpha.-methylstyrene, acrylonitrile, N-substituted maleimide or mixtures thereof, PA0 C) 1 to 50 parts by weight of at least one graft polymer of PA1 C.1) 5 to 90 parts by weight of styrene, .alpha.-methylstyrene, acrylonitrile, N-substituted maleimide or mixtures thereof, on PA1 C.2) 95 to 10 parts by weight of a rubber with a glass transition temperature .ltoreq.0.degree. C. and PA0 D) 1 to 25 parts by weight (per 100 parts by weight A+B+C) of at least one additive selected from flame retardants, lubricants, antistatic agent, mould release agents or mixtures thereof, characterised in that the component B) is produced by bulk, solution or suspension polymerisation and has an oligomer content .ltoreq.1 wt. %, component C) is produced by emulsion polymerisation and the total oligomer content of the moulding compositions is .ltoreq.0.6 wt. %.