Molded polycarbonate articles having improved optical and processing properties

US7201964B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Siegfried Anders · Recklinghausen, DE
• Rudiger Gorny · Dorpsstraat, US
• Peter Schwarz · Speyer, DE
• Claus Rüdiger · Krefeld, DE
• Jurgen Rohner

Key dates

• Filing date: Nov 17, 2004
• Grant date: Apr 10, 2007
• Expiry date: Dec 6, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31507
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A transparent sheet having improved optical properties is disclosed. The sheet that features a deviation angle αε (min) according to DIN 52305-A-AS of ≦2.0 and a refracting power Dε (min) according to DIN 52305-A-AZ of ≦0.05, is prepared by extruding a molding composition comprising linear (co)polycarbonate having weight average molecular weight of 25,000 to 31,000.