| 摘要 |
The present invention provides a coating composition capable of forming, on a zinc or zinc alloy plated steel plate subjected to a chromate chemical treatment, a coating film superior in processability, corrosion resistance, adhesive property, impact resistance, scratch resistance, etc. This composition comprises: (A) a polyester resin having a glass transition temperature of -25 DEG C. to 35 DEG C., a number-average molecular weight of 1,000-35,000 and a hydroxyl value of 3-80 mgKOH/g, (B) a melamine resin curing agent which is a methyl-etherified melamine resin, or a mixture of a methyl-etherified mel amine resin and a butyl-etherified melamine resin, (C) a rust preventive pigment, and (D) organic polymer fine particles, wherein the proportions of the individual components are: (A) 60-95 parts by weight, (B) 5-40 parts by weight, (C) 1-50 parts by weight per 100 parts by weight of the total of (A) and (B), and (D) 2-40 parts by weight per 100 parts by weight of the total of (A) and (B).
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