Aqueous dispersion of polyurethane resin and coating agent

Abstract

Provided is an aqueous dispersion of a polyurethane resin, the aqueous dispersion being able to achieve improvement in self-healing properties and solvent resistance and suppression of tack. An aqueous dispersion of a polyurethane resin according to an embodiment is an aqueous dispersion of a polyurethane resin having a portion derived from an isocyanate group-containing urethane prepolymer (A) and a portion derived from a chain extender (B). The isocyanate group-containing urethane prepolymer (A) includes, as constituent components, (A1) a polycarbonate diol that includes a constituent component derived from a diol having 5 carbon atoms and a constituent component derived from a diol having 6 carbon atoms and that has a number-average molecular weight of 300 to 2500, (A2) a polyethylene glycol having a number-average molecular weight of 500 to 2500, (A3) a carboxy group-containing polyol, and (A4) an alicyclic polyisocyanate. The amount of the polyethylene glycol relative to 100 parts by mass of the polycarbonate diol is 5 to 30 parts by mass.

Dependencies are inferred from the claim text.