Crosslinkable aqueous polyurethane dispersions having a long shelf life

US5147926A · kind A · utility

Assignee

• Basf Lacke & Farben Aktiengesellschaft · DE

Inventors

• Georg Meichsner · Ludwigshafen, DE
• Rainer Blum · Ludwigshafen, DE

Key dates

• Filing date: Oct 17, 1989
• Grant date: Sep 15, 1992
• Expiry date: Oct 17, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/833
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Crosslinkable aqueous polyurethane dispersions having a long shelf life contain PA0 A) polyurethane which have carbonyl groups, are dispersed in water in the presence of ammonia or of organic amines and are obtainable by reacting PA1 a) organic polyisocyanates with PA1 b) compounds which contain one or more active hydrogen atoms and one or more salt groups or one or more groups capable of salt formation and PA1 c) carbonyl-containing mono- and/or polyalcohols and PA1 d) if desired chain extenders and PA1 e) if desired polyhydroxy compounds having molecular weights of from 500 to 8,000, and PA0 B) polyhydrazides.