Method of foaming thermoplastic polycarbonate

US5256702A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Ernst Grigat
• Wolfgang Ebert · Krefeld, DE
• Burkhard Kohler · Leverkusen, DE
• Wolfgang Beer
• Ralf Dujardin · Willich, DE
• Klaus Horn · Dortmund, DE

Key dates

• Filing date: Apr 14, 1993
• Grant date: Oct 26, 1993
• Expiry date: Apr 14, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2405/00
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A method of foaming thermoplastic aromatic polycarbonates is disclosed. Accordingly, a polycarbonate resin is mixed with 0.01 to 10%, the percent being relative to the total weight of polycarbonate resin and polysaccharide, of a particular polysaccharide and the mixture then processed thermoplastically without the application of negative pressure in an extruder, at temperatures of 180.degree. C. to 320.degree. C., or in an injection molding machine, at temperatures of 190.degree. C. to 330.degree. C., to obtain foamed molded articles.