Patent ID: 6359060
Filing Date: 2002-03-19
Classification: C08G,C09D,Y10T

Abstract:
An oxidatively drying polyurethane dispersion obtained by a process comprising:a) reacting drying and/or semidrying oils A with low molar mass compounds B, which have two or more hydroxyl groups, to give compounds AB, which contain, on average, at least one hydroxyl group and at least one radical of a fatty acid having at least one olefinic double bond; b) reacting the compounds AB, together with high molar mass polyols C, and compounds D, which have at least two isocyanate-reactive groups and at least one acid group or have at least two isocyanate-reactive groups on a functional group that, following neutralization, leads to a cationic group, with polyfunctional isocyanates E to yield prepolymer ABCDE which has a mass fraction from about 0.1 to about 4%, based on the mass of prepolymer, unreacted isocyanate groups; c) reacting ABCDE with a chain terminator compound F which has an isocyanate-reactive group and which is selected from the group consisting of n-, iso- or sec-butanol, hexyl alcohol, octyl alcohol, decyl alcohol, dodecyl alcohol, tridecyl alcohol, stearyl alcohol, cyclohexanol, benzyl alcohol, ethylene glycol monoacetate, dipropylene glycol monoacetate, hydroxyethyl acrylate methacrylate, hydroxpropyl (meth)acrylate, hydroxybutyl (meth)acrylate, diethylamine, piperidine, ethanolamine and N,N-diethanolamine; d) neutralizing the product obtained above with neutralizing agents G; and e) transferring the neutralized product to the aqueous phase.