| 摘要 |
<p>A coating composition suitable for coated steel plates and capable of forming a coating film which is excellent in hardness, processability, pollution resistance and acid resistance comprises: (A) 65 to 95 parts by weight of a hydroxyl group-containing polyester resin having a number average molecular weight of 1,500 to 30,000, a glass transition temperature of -20 to 40{C and a hydroxyl value of 3 to 50 mgKOH/g; (B) 5 to 35 parts by weight of a melamine resin curing agent comprising a methyl etherified melamine resin and a butyl etherified melamine resin, wherein the melamine resin comprises 50 to 99% by weight based on the weight of the curing agent of the methyl etherified melamine resin and 1 to 50% by weight based on the weight of the curing agent of the butyl etherified melamine resin; wherein the total parts by weight of (A) and (B) equal 100; (C) 0.1 to 2.0 parts by weight based on the total of weight of (A) and (B) in the composition, of a curing catalyst comprising an optionally neutralized sulfonic acid compound; and (D) 0.3 to 10 parts by weight based on the total weight of (A) and (B), of a secondary amine compound having a boiling point of 30 to 250{C.</p> |
