Wenderoth, Lind & Ponack, L.L.P.
Coating composition and one layer-coated steel plate
 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: PA1 (A) a polyester resin having a glass transition temperature of -25.degree. C. to 35.degree. C., a number-average molecular weight of 1,000-35,000 and a hydroxyl value of 3-80 mgKOH/g, PA1 (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, PA1 (C) a rust preventive pigment, and PA1 (D) organic polymer fine particles, wherein the proportions of the individual components are: PA1 (A) 60-95 parts by weight, PA1 (B) 5-40 parts by weight, PA1 (C) 1-50 parts by weight per 100 parts by weight of the total of (A) and (B), and PA1 (D) 2-40 parts by weight per 100 parts by weight of the total of (A) and (B). 
Kansai Paint Co., Ltd.
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inventional additional inventional additional additional additional additional
Shoichi Takashi
Tanaka Nakano