POLYURETHANE DISPERSION AND POLYURETHANE LAMINATE

摘要

This polyurethane dispersion is a polyurethane dispersion in which a polyurethane resin obtained by the reaction between an isocyanate-group-terminated prepolymer and a chain extender is dispersed in water. The isocyanate-group-terminated prepolymer is obtained by at least reacting: a polyisocyanate component including xylylene diisocyanate and/or hydrogenated xylylene diisocyanate; and a polyol component including a C2-6 diol, a trivalent or higher low-molecular-weight polyol, and an active-hydrogen-group-containing compound including a hydrophilic group. The chain extender includes an alkoxysilyl compound having a primary amino group, or having a primary amino group and a secondary amino group. The mole percentage of hydroxyl groups in said trivalent or higher low-molecular-weight polyol is less than 25% with respect to a total of 100 mol% of hydroxyl groups in said polyol component.