Expandable styrene polymers containing carbon dioxide as blowing agent

US5229429A · kind A · utility

Assignee

• BASF SE

Inventors

• Klaus Hahn · Lampertheim, DE
• Knut Kaempfer
• Hans Hintz · Ludwigshafen, DE
• Anthony G. Schaefer · Huntsville, US
• Michael Riethues · Ludwigshafen, DE
• Michael Witt · Ludwigshafen, DE

Key dates

• Filing date: Nov 9, 1992
• Grant date: Jul 20, 1993
• Expiry date: Nov 9, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L71/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to expandable styrene polymers containing PA0 a) a styrene polymer, PA0 b) and at least one carbon dioxide absorber, mixed or copolymerized with the above, in an amount of from 0.01 to 50% by weight, based on the sum of a) and b), and PA0 c) a blowing agent or blowing agent mixture in an amount of from 0.5 to 12% by weight, where the blowing agent or blowing agent mixture comprises PA1 c.sub.1) from 10 to 100% by weight of carbon dioxide and PA1 c.sub.2) from 0 to 90% by weight of at least one further blowing agent. The invention furthermore relates to the styrene polymers containing a carbon dioxide absorber, to the styrene polymer foams obtainable from the expandable styrene polymers, and to an improved process for impregnating styrene polymers with carbon dioxide-containing blowing agents or blowing agent mixtures.