Aqueous polyurethane dispersions and their use as laminating adhesives

US5250610A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Eduard Hansel · Wuppertal, DE
• Walter Meckel · Neuss, DE
• Thomas Munzmay · Dormagen, DE

Key dates

• Filing date: Jan 30, 1992
• Grant date: Oct 5, 1993
• Expiry date: Jan 30, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31551
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to aqueous polyurethane dispersions based on PA1 A) a relatively high molecular weight polyhydroxyl component containing carboxylic acid groups, PA1 B) optionally another relatively high molecular weight polyhydroxyl component which is substantially free of carboxylic acid groups, PA1 C) optionally low molecular weight polyhydroxyl compounds as chain lengthening agents, PA1 D) organic polyisocyanates and PA1 E) a neutralizing agent capable of converting the carboxylic acid groups into carboxylate groups, the dispersions are characterized in that the carboxyl group-containing relatively high molecular weight polyhydroxyl component A) is the esterification product of a polyether polyol a1) in the molecular weight range of from 400 to 5000, with a polycarboxylic acid a2); the dispersions are useful as laminating adhesives.