Method for the preparation of flexible polyurethane foams with reduced hardness comprising adding a hydroxycarboxylic acid salt

US5132333A · kind A · utility

Assignee

• Th. Goldschmidt. AG · DE

Inventors

• Georg Burkhart · Essen, DE
• Hans-Heinrich Schlons · Essen, DE
• Volker Zellmer · Bottrop, DE

Key dates

• Filing date: Aug 15, 1991
• Grant date: Jul 21, 1992
• Expiry date: Aug 15, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2375/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A method for the preparation of flexible foams containing urethane groups and having a reduced hardness is disclosed. Polyethers, having at least two hydroxyl groups and a molecular weight of 400 to 12,000 are reacted with polyisocyanates in the presence of catalysts and water and, optionally, in the presence of emulsifiers, stabilizers, cross linking agents, blowing agents and conventional auxiliaries and additives. The method is carried out in the presence of 0.01 to 1.0 parts by weight, based on 100 parts by weight of the polyol, of the alkali salt or the alkaline earth metal salt of a hydroxycarboxylic acid. The method enables the use of chlorofluorocarbons to be omitted largely or completely as physical blowing agents.