| 摘要 |
To provide paint compositions with which a paint film which has excellent scratch resistance against car washing machine, dirt-soiling resistance and weather resistance can be obtained, and painted objects. [Means of Resolution] A clear paint composition which contains (A) acrylic copolymer which includes in the resin solid fraction from 35 to 50 mass% I-caprolactone structural units and of which the hydroxyl group value is from 200 to 340 mgKOH/g and the weight average molecular weight is from 5,000 to 15,000 and (B) non-yellowing type polyisocyanate compound in which the isocyanate group of the (B) component is included in a proportion of from 0.5 to 2 equivalents per 1 equivalent of hydroxyl group of the (A) component, the Young's modulus of the hardened paint film obtained from said paint composition is not more than 1.5 Pa, the molecular weight of intercrosslinking of the cured coating film (Mc) is not more than 350 g/mol and the glass transition temperature (Tg) of the hardened paint film is at least 65‹C. ® KIPO & WIPO 2008 |
