Method for producing polymethacrylimide foams

US7169339B2 · kind B2 · utility

Assignee

• ROEHM GMBH & CO. KG · DE

Inventors

• Peter Stein · Pfungstadt, DE
• Hermann Seibert · Kaiserslautern, DE
• Leonard Maier · Rodgau, DE
• Rainer Zimmermann · Paderborn, DE
• Wilfried Heberer · Reichelsheim, DE
• Werner Geyer · Heilbad Heiligenstadt, DE

Key dates

• Filing date: Aug 1, 2002
• Grant date: Jan 30, 2007
• Expiry date: May 12, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2333/24
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to an improved method for producing foamed material, especially poly(meth)acrylimide foams, which are foamed from polymer plates produced according to the casting method. The two-step method consists of a pre-heating step and at least one foaming step. The product obtained has a significantly smaller compressive strain, measured according to DIN 53425(ASMD 621), than prior art products.