Branched polycarbonates

US7345133B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Helmut-Werner Heuer · Krefeld, DE
• Rolf Wehrmann · Krefeld, DE
• Ulrich Blaschke · Krefeld, DE
• Michael Erkelenz · Duisburg, DE

Key dates

• Filing date: Nov 1, 2005
• Grant date: Mar 18, 2008
• Expiry date: Feb 26, 2026

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/14
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A branched polycarbonate and processes for its preparation are disclosed. The polycarbonate contains structural units conforming toin which R1, R2, R3 and R4 mutually independently denote C1-C10 alkyl, R5, R6 and R7 mutually independently denote hydrogen or C1-C10 alkyl, or R1 and R2, and R3 and R4, with the carbon atom to which they are attached, form a C5-C10 cycloalkyl group, wherein the cycloalkyl group may be substituted.