Patent · US Expired

Polydiorganosiloxane-polycarbonate block co-codensates with improved protection against UV light

US5137949A · kind A · utility

21Cited by

9References

2Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Winfried Paul · Krefeld, DE
Hans-Josef Buysch · Krefeld, DE
Wolfgang Nising · Sankt Augustin, DE
Thomas Scholl · New Haven, US

Key dates

Filing date	Oct 26, 1990
Grant date	Aug 11, 1992
Priority date	—
Expiry date	Oct 26, 2010

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08K5/3475
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A thermoplastic molding composition is disclosed comprising a polydiorganosiloxane-polycarbonate block cocondensate and 0.5% to 15% by weight of a particular hydroxy benzotriazole. The composition is characterized by its improved protection against UV light.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.