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|1. (WO2013146986) AQUEOUS POLYURETHANE RESIN DISPERSION|
|Applicants:||UBE INDUSTRIES, LTD.
|Title:||AQUEOUS POLYURETHANE RESIN DISPERSION|
The present invention provides an aqueous polyurethane resin dispersion, wherein a polyurethane resin that is obtained by reacting (A) a polyurethane prepolymer, which is obtained by reacting (a) a polyisocyanate compound, (b) a polyol compound, (c) an acidic group-containing polyol compound and (d) a blocking agent for isocyanate groups, with (B) a chain extender is dispersed in an aqueous medium. This aqueous polyurethane resin dispersion is characterized in that: the total of the urethane bond content and the urea bond content is 8-13% by weight based on the solid content; the carbonate bond content is 15-40% by weight based on the solid content; the content of isocyanate groups bonded by the blocking agent is 0.3-2.0% by weight; and an alkanedioic acid dihydrazide is contained as the chain extender.