Aqueous polyurethane dispersions and their use as laminating...

Details Aqueous polyurethane dispersions and their use as laminating... Aqueous polyurethane dispersions and their use as laminating...

C - Chemistry, Metallurgy

08

L

C08L 75/04 (2006.01) C08G 18/08 (2006.01) C08G 18/42 (2006.01) C08G 18/48 (2006.01) C09J 175/04 (2006.01)

Patent

CA 2060565

Mo3717 LeA 28,037 AQUEOUS POLYURETHANE DISPERSIONS AND THEIR USE AS LAMINATING ADHESIVES ABSTRACT OF THE INVENTION The present invention relates to aqueous polyurethane dispersions based on A) a relatively high molecular weight polyhydroxyl component containing carboxylic acid groups, B) optionally another relatively high molecular weight polyhydroxyl component which is substantially free of carboxylic acid groups, C) optionally low molecular weight polyhydroxyl compounds as chain lengthening agents, D) organic polyisocyanates and 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 al) in the molecular weight range of from 400 to 5000, with a polycarboxylic acid a2); the dispersions are useful as laminating adhesives. Mo3717

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