CROSSLINKABLE AQUEOUS POLYURETHANE DISPERSIONS HAVING A LONG SHELF LIFE

• Main Authors: MEICHSNER; GEORG, BLUM; RAINER
• Format: Patent
• Language: English
• Published: 15.09.1992
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; USE OF MATERIALS THEREFOR; WOODSTAINS

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