Liquid polyisocyanate mixtures, a process for their preparation, and their use in the preparation of polyurethane foams

US5028636A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Herbert Gebauer · Krefeld, DE
• Pramod Gupta · Bedburg, DE
• Gerhard Heilig · Bensberg, DE
• Rolf Wiedermann · Bensberg, DE

Key dates

• Filing date: Aug 16, 1990
• Grant date: Jul 2, 1991
• Expiry date: Aug 16, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2110/0025
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

This invention relates to novel urethane-modified polyisocyanate mixtures of the diphenylmethane series prepared by a process comprising reacting polyisocyanates or polyisocyanate mixtures of the diphenylmethane series with certain monohydric and/or polyhydric alcohols and, optionally, subsequently mixing the initially modified products with polyisocyanates or polyisocyanate mixtures of the diphenylmethane series that have not been modified with urethane groups. This invention further relates to the use of the polyisocyanate mixtures in the preparation of polyurethane foams.