| 摘要 |
To provide a top-coat paint composition with which the paint films do not generate harmful materials such as formaldehyde and with which paint films which have both excellent workability and excellent staining resistance can be formed. [Means of Resolution] A top-coat paint composition for pre-coatin g purposes which is characterized in that it includes (A) polyester resin of which the hydroxyl group value is from 10 to 35 mgKOH/g, the acid value is not more than 15 mgKOH/g and the number average molecular weight is from 2,0 00 to 6,000, (B) acrylic resin of which the hydroxyl group value is from 50 to 150 mgKOH/g, the amine value is from 10 to 50 mgKOH/g, the number average molecular weight is from 1,500 to 8,000 and the glass transition temperatur e is from 0 to 500C, and (C) polyester resin of which the hydroxyl group val ue is from 50 to 150 mgKOH/g, the acid value is not more than 20 mgKOH/g and the number average molecular weight is from 1,000 to 4,000, and in that the proportions as the base resins of each component are from 45 to 80 mass% of the (A) component, from 10 to 40 mass% of the (B) component and from 5 to 3 0 mass% of the (C) component, and which also includes (D) blocked polyisocya nate as a crosslinking agent which reacts with hydroxyl groups.
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