| 摘要 |
PROBLEM TO BE SOLVED: To obtain a coating composition which can give a coating film excellent in weathering resistance, corrosion resistance, abrasion resistance, etc., by incorporating a component comprising a polyvinylidene fluoride and an acrylic resin with an OH-containing acrylic-monomer-grafted fluororesin, a blocked polyisocyanate compound capable of a curing reaction with the resin, and a polytetrafluoroethylene powder in a specified ratio. SOLUTION: This composition is prepared by mixing 100 pts.wt., in total, polyvinylidene fluoride and an acrylic resin with 3-30 pts.wt. solvent-soluble OH-containing acrylic-monomer-grafted fluororesin, and 1-20 pts.wt. polytetrafluoroethylene powder and further mixing the resulting mixture with such an amount of a blocked polyisocyanate compound capable of a curing reaction with the OH-containing acrylic-monomer-grafted fluororesin as to give an NCO/OH equivalent ratio of 0.5-1.5. The composition is useful for coating a metallic sheet having been coated with a chromate-treated film and can impart a moderate hardness and lubricity to the coating film. |
