Fire-retardant polycarbonates and polyesters

US5025065A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Peter Tacke · Krefeld, DE
• Ulrich Grigo · New Martinsville, US
• Werner Nouvertne · Krefeld, DE
• Dieter Freitag · Krefeld, DE
• Karsten-Josef Idel · Krefeld, DE
• Uwe Westeppe · Mettmann, DE

Key dates

• Filing date: Apr 4, 1990
• Grant date: Jun 18, 1991
• Expiry date: Apr 4, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G63/64
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Fire-retardant polycarbonates, polyester carbonates and polyesters based on dihydroxydiphenyl cycloalkanes ##STR1## in which R.sup.1 and R.sup.2 independently of one another represent hydrogen, halogen, preferably chlorine or bromine, C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.6 cycloalkyl, C.sub.6 -C.sub.10 aryl, preferably phenyl and C.sub.7 -C.sub.12 aralkyl, preferably phenyl-C.sub.1 -C.sub.4 -alkyl, more especially benzyl, PA0 m is an integer of 4 to 7, preferably 4 or 5, R.sup.3 and R.sup.4 may be individually selected for each X and, independently of one another, represent hydrogen or C.sub.1 -C.sub.6 alkyl and PA0 X is carbon, PA1 with the proviso that, at at least one atom X, R.sup.3 and R.sup.4 are both alkyl, PA1 the fire-retardant finish being provided by additives and/or comonomers.