Copolycarbonate compositions with cyclic and linear oligomers and improved optical properties

US10323145B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Rolf Wehrmann · Krefeld, DE
• Helmut-Werner Heuer · Krefeld, DE
• Anke Boumans · Goch, DE

Key dates

• Filing date: Jul 31, 2015
• Grant date: Jun 18, 2019
• Expiry date: Aug 6, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2205/025
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to copolycarbonate compositions having cyclic and linear oligomers and improved optical properties, to their use for producing blends and moldings and to moldings obtained therewith. The copolycarbonate compositions comprise (A) 5% to 99% by weight, based on the total weight of the copolycarbonate composition, of a copolycarbonate containing one or more monomer units of the formula (1) wherein R1 is hydrogen or C1-C4-alkyl, R2 is C1-C4-alkyl, and n is 0, 1, 2 or 3 and (B) 95% to 1% by weight, based on the total weight of the copolycarbonate composition, of a (co)polycarbonate containing one or more monomer units of the general formula (2) wherein R3 is H or linear or branched C1-C10 alkyl and R4 is linear or branched C1-C10 alkyl.