Patent ID: 6632858
Filing Date: 2003-10-14
Classification: C08G,C09D

Abstract:
An ink having a viscosity of less than 20 cp at 20Â° C. comprising(a) a non-isocyanate terminated, coloured, water-dissipatable polyurethane, having a weight average molecular weight from 1,000 to 15,000 obtained from the reaction of a mixture comprising the components: (i) at least one organic polyisocyanate; (ii) at least one isocyanate-reactive compound providing ionic water-dispersing groups provided that the isocyanate-reactive compound providing ionic water-dispersing groups excludes polyesters bearing sulphonic acid groups; and (iii) at least one colorant having at least two functional groups selected from isocyanate groups and isocyanate-reactive groups; where the proportion of insoluble polyurethane in water is less than 50%; provided that the polyurethane is not a chain-extended polyurethane and (b) a liquid medium.