Expandable styrene polymers of high heat resistance

US5464881A · kind A · utility

Assignee

• BASF SE

Inventors

• Rolf Henn · Ketsch, DE
• Siegmund Besecke · Hameln, DE
• Andreas Deckers · Flomborn, DE
• Norbert Guentherberg · Speyer, DE
• Martin Brudermueller · Mannheim, DE
• Gerhard Nestler · Ludwigshafen, DE
• Karl-Heinz Wassmer · Mutterstadt, DE

Key dates

• Filing date: Nov 22, 1994
• Grant date: Nov 7, 1995
• Expiry date: Nov 22, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2351/00
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

An expandable styrene polymer comprising PA1 a) from 0 to 90% by weight of a styrene polymer or styrene copolymer other than b) contains at least 50% by weight of copolymerized styrene, PA1 b) from 10 to 100% by weight of a styrene/methacrylamide copolymer comprising from 0.5 to 50% by weight of at least one copolymerized N-substituted methacrylamide of the formula I ##STR1## where R.sup.1 and R.sup.2 are identical or different and are hydrogen, C.sub.1 - to C.sub.15 -alkyl, C.sub.6 - to C.sub.16 -cycloalkyl or C.sub.6 - to C.sub.20 -aryl, it being possible, if R.sup.1 and R.sup.2 contain at least 2 carbon atoms, for at least 2 carbon atoms to be linked via hetero atoms, and PA1 c) from 1 to 15% by weight, based on the sum of a) and b), of an aliphatic C.sub.3 - to C.sub.9 -hydrocarbon and/or carbon dioxide as blowing agent.