Polycarbonate compositions having improved optical properties

US8664349B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

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

Key dates

• Filing date: Sep 17, 2010
• Grant date: Mar 4, 2014
• Expiry date: Oct 28, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K5/49
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to polycarbonate compositions and copolycarbonate compositions having improved optical properties, and to their production and their use for the production of shaped parts, and to shaped parts which can thereby be obtained, the compositions containing a polycarbonate or copolycarbonate which comprises bisphenol-A and at least one pair of a phosphorus compound having the oxidation number +3 and a phosphorus compound having the oxidation number +5, and the phosphorus compound having the oxidation state +5 in a pair respectively corresponding to the oxidized form of the phosphorus compound having the oxidation state +3 and the amount of more highly oxidized compound contained being less than that of the compound with the lower oxidation number.