Preparation of foams having a high compressive strength

US5006566A · kind A · utility

Assignee

• BASF SE

Inventors

• Reinhold Weber · Biberach an der Riß, DE
• Manfred Weilbacher · Bischofswerda, DE
• Hermann Tatzel
• Ludwig Zuern
• Hans D. Zettler · Havelsee, DE
• Klaus Hinselmann · Mutterstadt, DE

Key dates

• Filing date: Dec 2, 1988
• Grant date: Apr 9, 1991
• Expiry date: Dec 2, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2325/04
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Foams having high compressive strength are obtained by extrusion of a mixture of a styrene polymer and from 3 to 9% by weight of a blowing agent consisting of from 80 to 100% by weight of CO.sub.2 and from 0 to 20% by weight of one or more halohydrocarbons or hydrocarbons which are gaseous at room temperature, the mixture being extruded into a zone under from 0.1 to 2 bar gage pressure and the foam being allowed to stabilize under this pressure.