Patent ID: 6451908
Filing Date: 2002-09-17
Classification: C08G,Y10T

Abstract:
A process for preparing a polyurethane film comprising the steps of:preparing a nonionic prepolymer formulation, the prepolymer formulation comprising a diisocyanate, an active hydrogen containing material, and a polyether monol, the monol comprising polyoxyethylene and being present in an amount effective for improving shear stability of a dispersion prepared from the prepolymer formulation but no more than 0.99 percent by weight of prepolymer formulation; dispersing the prepolymer formulation in water in the presence of a surfactant to prepare a coagulatable dispersion, the coagulatable dispersion having improved shear stability over a dispersion prepared without a polyether monol; and forming a film by coagulating or electrodepositing the coagulatable dispersion onto a substrate, wherein the three steps occur in the substantial absence of an organic solvent.