Patent ID: 6776287
Filing Date: 2004-08-17
Classification: C08G,C08J,Y10T

Abstract:
Water-soluble packaging comprising an enveloping film which is soluble in water at temperatures between 5 and 35Â° C., said enveloping film comprising at least one polyurethane polymer, which at least one polyurethane polymer comprises:2 to 35 weight %, based on the weight of polyurethane polymer, of poly(ethylene oxide) groups which have a chain length(s) corresponding to a number average molecular weight within the range of from 300 to 3,000 Daltons; 15 to 150 millequivalents, per 100 g of polyurethane polymer, of acid-functional groups; and wherein at least 50 weight% of the acid-functional groups are neutralised, such neutralisation being with at least one base, at least part of which is at least one non-volatile base; and said at least one polyurethane polymer is a chain extended product formed using: (A) a prepolymer component comprising an isocyanate-terminated polyurethane prepolymer, said component being formed from reactants which comprise: (i) at least one organic polyisocyanate, (ii) at least one isocyanate-reactive compound providing said poly(ethylene oxide) groups in the resulting polyurethane polymer, and (iii) at least one isocyanate-reactive compound providing said acid-functional groups in the resulting polyurethane polymer, and (B) an active hydrogen component comprising at least one active hydrogen chain-extending compound.