Waterborne polyurethanes with urea-urethane linkages

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/08 (2006.01) C08G 18/10 (2006.01) C08G 18/12 (2006.01) C09J 175/00 (2006.01)

Patent

CA 2312796

Waterborne polyurethanes possessing urea-urethane linkages that are not separated by any intervening carbon atoms may be obtained by using hydroxylamine as a chain extender. Isocyanate-terminated prepolymer possessing ionized or easily ionizable groups is reacted with NH2OH to form a polyurethane possessing urea-urethane linkages corresponding to formula (I). The waterborne polyurethanes are useful in adhesive, coating and ink formulations and in the flexible package industry.

L'invention concerne des polyuréthanes en phase aqueuse possédant des liaisons urée-éthane qui ne sont dissociées par l'intervention d'aucun atome de carbone, susceptibles d'être obtenues par le biais d'une hydroxylamine tenant lieu d'allongeur de chaîne. On établit une réaction entre un prépolymère à terminaison isocyanate qui comporte des groupes ionisés ou facilement ionisables, d'une part, et NH¿2?OH, d'autre part, pour constituer un polyuréthane possédant des liaisons urée-éthane, selon la formule (I). Les polyuréthanes en question sont utiles dans les formulations pour adhésif, revêtement et encre ainsi que dans l'industrie des emballages souples.

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