Use of nucleus-brominated phthalic acid anhydride for stabilizing thermoplastic polycarbonates against the effect of gamma-rays

US5476893A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Charles E. Lundy · Pittsburgh, US
• Ulrich Grigo · New Martinsville, US
• Alexa Sommer · Bensberg, DE
• Klaus Horn · Dortmund, DE
• Klaus Sommer · Heidelberg, DE
• Arno Becker

Key dates

• Filing date: Sep 21, 1993
• Grant date: Dec 19, 1995
• Expiry date: Sep 21, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K5/1539
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to the use of nucleus-brominated phthalic acid derivatives, optionally in combination with polyalkylene oxides corresponding to formula (V) ##STR1## in which R is H, C.sub.1-6 alkyl, tetrahydropyranyl or a silyl group, PA1 R' is H or C.sub.1-6 alkyl and PA1 x is an integer of 1 to 100, for stabilizing thermoplastic polycarbonates against the effect of .gamma.-rays.