| abstract |
(57) [Summary] [Problem] To apply a two-layer coating film consisting of a base coat and a top coating in one bake, and to cure the coating film, and to improve the curability, coating film properties and workability suitable for forming the coating film. Providing excellent curing agents for topcoat paints. SOLUTION: A polyisocyanate containing 1% to 70% of a uretdione dimer of 1,6-hexamethylene diisocyanate is used as a curing agent for a top coat. |