Polysiloxane-polycarbonate block copolymers based on certain dihydroxydiphenylcycloalkanes

US5068302A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Peter Horlacher · Senden, DE
• Volker Serini · Krefeld, DE
• Dieter Freitag · Krefeld, DE
• Ulrich Grigo · New Martinsville, US
• Karsten-Josef Idel · Krefeld, DE
• Uwe Westeppe · Mettmann, DE

Key dates

• Filing date: Aug 8, 1990
• Grant date: Nov 26, 1991
• Expiry date: Aug 8, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/448
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polydiorganosiloxane-polycarbonate block copolymers based on dihydrodiphenylcycloalkanes corresponding to formula (I) ##STR1## in which R.sup.1, R.sup.2 independently of one another represent hydrogen, halogen, preferably chlorine or bromine, C.sub.1-8 alkyl, C.sub.5-6 cycloalkyl, C.sub.6-10 aryl and C.sub.7-12 aralkyl, preferably phenyl-C.sub.1-4 -alkyl, more especially benzyl, PA0 n=2 or 3 and PA0 the substituents R.sup.5 independently of one another are hydrogen or C.sub.1-12 alkyl, with the proviso that at least one of the substituents R.sup.5 is not hydrogen, having an average molecular weight M.sub.w (weight average) in the range from 10,000 to 300,000 (as measured by ultracentrifugation or scattered light measurement) and a content of carbonate containing dihydroxydiphenylcycloalkanes of formula I and, optionally, other diphenols in co-condensed form of from 75% by weight of 99.0% by weight and a content of polydiorganosiloxane having a degree of polymerization Pn of 5 to 300 of from 25% by weight of 1% by weight.