Self-extinguishing, expandable styrene polymers

US4218511A · kind A · utility

Assignee

• BASF SE

Inventors

• Klaus Hahn · Lampertheim, DE
• Manfred Walter · Nuremberg, DE
• Karl Stange · Neustadt, DE
• Heinz Weber · Uerdingen, DE

Key dates

• Filing date: Dec 1, 1978
• Grant date: Aug 19, 1980
• Expiry date: Dec 1, 1998

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2998
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Particulate self-extinguishing thermoplastic molding compositions based on styrene polymers containing volatile blowing agents are surface-coated with an organic bromine compound and, to stabilize the bromine compound against photodegradation, a N-hydroxyphenylbenzotriazole or a hydroxybenzophenone. The molding compositions may be used for the manufacture of foams by expanding the blowing agents at elevated temperatures.