Process for preparing rigid polyurethane foams

US5736588A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Norbert Eisen · Hanerau-Hademarschen, DE
• Walter Klan · Leverkusen, DE
• Frank Otto · Hilden, DE
• James A. Thompson-Colón · Celaya, MX

Key dates

• Filing date: May 15, 1996
• Grant date: Apr 7, 1998
• Expiry date: May 15, 2016

Classification

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

Abstract

Rigid foams which possess urethane groups are prepared by reacting polyisocyanates with compounds which possess at least two active hydrogen atoms which are reactive towards isocyanate groups, in the presence of water and alkanes as blowing agent and solution promoters. The solution promoter used is a compound with a polar group.