High-functionality highly branched or hyperbranched polycarbonates and their preparation and use

US7649074B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Bernd Bruchmann · Ludwigshafen, DE
• Harald Schaefer · Ludwigshafen, DE

Key dates

• Filing date: Feb 23, 2006
• Grant date: Jan 19, 2010
• Expiry date: Jul 20, 2026

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D201/005
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A high-functionality, highly branched or hyperbranched polycarbonate that has a weight average molecular weight of between 3,300 and 150,000, a degree of crosslinking of less than 15%, and a degree of branching ranging from 10% to 99.9%; the polycarbonate being made by a process comprising preparing one or more condensation products (K), and intermolecularly reacting the one or more condensation products (K) to form the polycarbonate.