Polycarbonate foam articles

US5158985A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Burkhard Kohler · Leverkusen, DE
• Klaus Horn · Dortmund, DE
• Wolfgang Ebert · Krefeld, DE
• Klaus Kircher · Leverkusen, DE
• Johann Piontek · Dormagen, DE

Key dates

• Filing date: Dec 27, 1991
• Grant date: Oct 27, 1992
• Expiry date: Dec 27, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2369/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the production of polycarbonate foam moldings is disclosed. Accordingly, a composition is prepared comprising mixing a thermoplastic polycarbonate resin and 0.01 to 1 mole-% of a transesterification catalyst and PA1 a) 0.1 to 5 mole-% of an aromatic polycarboxylic acid, optionally along with about 0.1 to 5 mole-% of at least one member selected from the group consisting of aliphatic hydroxy carboxylic acids and aliphatic polyalcohols, or PA1 b) 0.1 to 5 mole-% of H.sub.2 O, optionally along with at about 0.1 to 5 mole-% of at least one member selected from the group consisting of aliphatic hydroxycarboxylic acids and an aliphatic alcohols, or PA1 c) the additives of said a) and b), or PA1 d) 0.1 to 5 mole-% of at least one member selected from the group consisting of diarylcarbonates and oligocarbonates, said percent based in every case on moles aromatic carbonate structural units ##STR1## in which --O--R--O is a diphenolate residue. The composition obtained is processed to foam moldings by injection molding or by extrusion at temperatures of 210.degree. C. to 340.degree. C.