Patent ID: 6605666
Filing Date: 2003-08-12
Classification: A61P,C08G,C09D

Abstract:
A polyurethane dispersion, said polyurethane comprising the reaction product of:(a) an isocyanate functional prepolymer comprising the reaction product of (i) at least one polyactive hydrogen compound, wherein said compound is an alkyl, aryl, or aralkyl structure optionally substituted in or on the chain or both in and on the chain by N, O or S, or combinations thereof, and wherein said compound is insoluble in a lower alcohol-water mixture having an alcohol to water ratio of at least 50:50 by weight; (ii) at least one polyisocyanate, and (iii) at least one active hydrogen compound soluble in said lower alcohol-water mixture selected from the group consisting of a compound containing an ionic group, a compound containing a moiety capable of forming an ionic group, a compound containing a polyester, polyether, or polycarbonate group having a ratio of 5 or less carbon atoms for each oxygen atom and mixtures thereof; and (b) at least one polyfunctional chain extender; wherein the dispersion has a continuous phase comprising a lower alcohol-water mixture having at least twenty weight percent alcohol.