A waterborne polyurethane dispersion is provided. The waterborne polyurethane dispersion is prepared in the presence of a chain extender N-aminoethylpiperazine (AEP) and exhibits good modulus while retaining limited solubility.

The present invention provides a coating agent for a vapor deposited film, the coating agent containing a urethane resin (A) and an aqueous medium (B), the urethane resin (A) being a reaction product of a composition that contains a polyester (A3) which is a polycondensate of a polycarboxylic acid component (A1) and a polyhydric alcohol component (A2), an active hydrogen group-containing compound (A4) having a hydrophilic group, and a diisocyanate (A5), the urethane resin (A) having an ester skeleton derived from the polyester (A3), the polycarboxylic acid (A1) containing at least one of an aromatic dicarboxylic acid and an acid anhydride thereof in an amount of 10 to 100% by mass based on 100% by mass of a total amount of the polycarboxylic acid (A1), the polyhydric alcohol component (A2) containing an alkylene glycol having 2 to 6 carbon atoms.

The present invention provides a urethane resin composition including an anionic urethane resin (X) and water (Y), in which the anionic urethane resin (X) is produced using, as raw materials, a polycarbonate polyol (A-1) produced using biomass-derived decanediol as a raw material, and a polycarbonate polyol (A-2) produced using a biomass-derived dihydroxy compound having a cyclic ether structure as a raw material. The polycarbonate polyol (A-1) is preferably produced further using butanediol as a raw material. In the polycarbonate polyol (A-1), the molar ratio [(C4)/(C10)] of the butanediol (C4) to the biomass-derived decanediol (C10) is preferably within a range of 50/50 to 98/2.

The present invention provides a urethane resin composition including an anionic urethane resin (X) and water (Y), in which the anionic urethane resin (X) is produced using, as raw materials, a polycarbonate polyol (A-1) produced using biomass-derived decanediol as a raw material, and a polycarbonate polyol (A-2) produced using a biomass-derived dihydroxy compound having a cyclic ether structure as a raw material. The polycarbonate polyol (A-1) is preferably produced further using butanediol as a raw material. In the polycarbonate polyol (A-1), the molar ratio [(C4)/(C10)] of the butanediol (C4) to the biomass-derived decanediol (C10) is preferably within a range of 50/50 to 98/2.