| 摘要 |
The present invention addresses the problem of providing an aqueous polyurethane resin dispersion which has good dispersibility in an aqueous medium and can be dried into a coating film having a high refractive index, a high elastic modulus and excellent solvent resistance. The present invention relates to an aqueous polyurethane resin dispersion which is prepared by dispersing a polyurethane resin in an aqueous medium, wherein the polyurethane resin is produced by reacting a polyurethane prepolymer (A) with a chain extender (B), and wherein the polyurethane prepolymer (A) is produced by reacting a polythiocarbonate polythiol (a), an acidic group-containing polyol compound and/or an acidic group-containing polythiol compound (b), a polyisocyanate and/or a polyisothiocyanate (d) and optionally a polyol and/or a polythiol (c) which is different from the component (a) or (b) with one another. The present invention also relates to: a polyurethane resin film produced using the aqueous polyurethane resin dispersion; and a coating composition containing the aqueous polyurethane resin dispersion. |
