Polycarbonate of alkyl cyclohexylidene bisphenol

US5010162A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Volker Serini · Krefeld, DE
• Dieter Freitag · Krefeld, DE
• Uwe Westeppe · Mettmann, DE
• Karsten-Josef Idel · Krefeld, DE
• Ulrich Grigo · New Martinsville, US
• Carl Casser · Neunburg vorm Wald, DE
• Klaus-Christian Paetz · Burscheid, DE
• Manfred Hajek · Leverkusen, DE

Key dates

• Filing date: Dec 19, 1989
• Grant date: Apr 23, 1991
• Expiry date: Dec 19, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Thermoplastic aromatic polycarbonates having average molecular weights Mw of at least 10,000 which contain bifunctional carbonate structural units corresponding to formula (I) ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another represent hydrogen, a C.sub.1 -C.sub.12 hydrocarbon radical, halogen and PA0 R.sup.5, R.sup.6 and R.sup.7 represent hydrogen, iso-C.sub.3 -C.sub.5 -alkyl, one of the substituents R.sup.5, R.sup.6 or R.sup.7 not being hydrogen, in quantities of from 100 to 1 mol-%, based on the total quantity of difunctional carbonate structural units in the polycarbonate.