The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 21, 2004
Filed:
Sep. 05, 2002
Applicant:
Inventors:
Siegfried Anders, Köln, DE;
Jürgen Röhner, Köln, DE;
Wilfried Haese, Odenthal, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B 2/736 ;
U.S. Cl.
CPC ...
B32B 2/736 ;
Abstract
A polycarbonate molding having improved optical properties is disclosed. The molding features an angle of deflection &agr; (min) determined in a accordance with DIN 52305-A-AS of ≦2.0 and a refractive index D (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 cm /10 min (300° C.; 1.2 kg) determined in accordance with ISO 1133.