| 摘要 |
PURPOSE: To obtain the composition free from the breaking of the base resin and the detachment of the aggregates, excellent in scratch resistance and abrasion resistance due to the high film hardness of 9H or higher as pencil hardness, and also excellent in processability, impact resistance, and durability such as weathering resistance, and staining resistance. CONSTITUTION: This coating composition comprises, as the major component, on a solid basis, a vehicle composed of 50 to 75 pts.wt. of an acrylic resin with a hydroxyl value ranging from 60 to 110mgKOH/g and a glass transition temperature ranging from 70 to 110 deg.C and 50 to 25 pts.wt. of a melamine resin, and inorganic aggregates with an average particle diameter ranging from 3 to 30μm at 5 to 60 pts.wt. based on 100 pts.wt. of the solid content of the vehicle. The inorganic aggregates are preferably at least one kind of inorganic fine powder selected from fused alumina and glass beads. The other objective coated metal plate has on at least one side thereof a chemically treated film, on which there is an undercoating film, on which there is a coating film obtained by application and baking of the coating composition.
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