Polycarbonate molded bodies with improved optical properties

US6833193B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Siegfried Anders · Recklinghausen, DE
• Jurgen Rohner
• Wilfried Haese · Rheydt, DE

Key dates

• Filing date: Sep 5, 2002
• Grant date: Dec 21, 2004
• Expiry date: Sep 5, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31507
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A polycarbonate molding having improved optical properties is disclosed. The molding features an angle of deflection &agr;&egr; (min) determined in a accordance with DIN 52305-A-AS of ≦2.0 and a refractive index D&egr; (min) determined in accordance with DIN 52305-A-AZ of ≦0.05. The molding is prepared from a molding composition that contains a branched polycarbonate having a weight average molecular weight of 25,000 to 40,000 and melt volume rate of 2 to 20 cm3/10 min (300° C.; 1.2 kg) determined in accordance with ISO 1133.