Process for the production of polyurethane foams using sterically hindered aromatic diamines

US4945120A · kind A · utility

Inventors

• Richard Kopp · Cologne, DE
• Gunter Oertel · Leverkusen, DE
• Eckehard Weigand · Leverkusen, DE
• Rolf Wiedermann · Bensberg, DE

Key dates

• Filing date: May 23, 1989
• Grant date: Jul 31, 1990
• Expiry date: May 23, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S521/904
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention is directed to the production of free-rise polyurethane foams using sterically hindered diamines of the formula (e) ##STR1## and/or ##STR2## in which R.sup.1 and R.sup.2 may be the same or different and represent C.sub.1 -C.sub.4 -alkyl and PA0 R.sup.3 and R.sup.4 may again be the same or different and represent H or CH.sub.3, is added to said reaction mixture.