Process for the preparation of flame-resistant polycarbonate moulding compositions containing tetrafluoroethylene polymers

US4649168A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans-Jurgen Kress · Krefeld, DE
• Ludwig Bottenbruch · Krefeld, DE
• Mark W. Witman · Pittsburgh, US
• Klaus Kircher · Leverkusen, DE
• Christian Lindner · Bensheim, DE
• Karl-Heinz Ott

Key dates

• Filing date: Nov 13, 1985
• Grant date: Mar 10, 1987
• Expiry date: Nov 13, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L69/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the preparation of flame-resistant polycarbonate moulding compositions, which is characterized in that, besides the addition of alkali metal salts, there is incorporation of tetrafluoroethylene polymers as an intimate mixture with halogen-free graft polymers, these intimate mixtures being prepared by coagulation of the appropriate emulsion mixtures, and to the polycarbonate moulding compositions obtainable by the process according to the invention.