| abstract |
PROBLEM TO BE SOLVED: To provide a coating composition for a pre-coated steel sheet excellent in both workability and hardness of a coating film even at a relatively thin plate thickness and excellent in stain resistance, and this coating composition. To obtain a precoated steel sheet. SOLUTION: General formula (1) In a paint compounding system mainly composed of a resin component composed of a polyester compound having a main repeating unit, a polyol and an isocyanate compound as a curing agent, each is selected from two specific blocked polyisocyanate compound groups as a curing agent. By using a mixture of at least one kind of blocked polyisocyanate compound obtained, a coating film excellent in all of processability, coating film hardness and stain resistance is obtained. |