Process for producing a polyurethane foam by means of supercritical or near-critical blowing agent

US9139683B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Stefan Lindner · Friesenheim, DE
• Wolfgang Friederichs
• Reinhard Strey · Dormagen, DE
• Thomas Sottmann
• Elena Khazova · Mannheim, DE
• Lorenz Kramer
• Verena Dahl · Cologne, DE
• Agnes Chalbi · Bad Mergentheim, DE

Key dates

• Filing date: Nov 3, 2010
• Grant date: Sep 22, 2015
• Expiry date: May 28, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2375/04
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The present invention relates to a process for producing a polyurethane foam, where the blowing agent used is present in the supercritical or near-critical state. A reaction mixture is introduced into a closed mould, where the closed mould has been set up in such a way that its interior volume and/or the pressure prevailing in its interior can be altered after the introduction of the mixture by external influence. Through the selection of the surfactant it is possible to obtain microemulsions of the blowing agent in the polyol phase. The invention further relates to a nanocellular polyurethane foam obtainable by the process of the invention.