Process for the production of polyurethane foams

US5350781A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Ulrich Liman · Monheim, DE
• Hartwig Grammes · Leverkusen, DE
• Dirk Wegener · Bielefeld, DE
• Manuel KAISER · Cologne, DE

Key dates

• Filing date: Sep 20, 1993
• Grant date: Sep 27, 1994
• Expiry date: Sep 20, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2170/60
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the production of polyurethane foams by reacting a reaction mixture consisting essentially of PA1 a) a polyisocyanate component, with PA1 b) a polyol component free from salt groups, in the presence of PA1 c) at least one blowing agent, PA1 d) salts of ester-functional .alpha.,.beta.-unsaturated carboxylic acids and, optionally, PA1 e) other auxiliaries and additives typically used in polyurethane chemistry. Component d) the salts of ester-functional .alpha.,.beta.-unsaturated carboxylic acids are the reaction products of (i) monohydric or polyhydric alcohols, with (ii) unsaturated dicarboxylic acids or unsaturated dicarboxylic anhydrides, which contain on a statistical average at least one alkali metal carboxylate group and at most 0.5 alcoholic hydroxyl groups per molecule. The present invention also relates to the composites produced by back-foaming of a plastic film as a surface layer wherein the foam is produced by the process described above.