| 摘要 |
PURPOSE:To provide a paint which is suitable for use as intercoating for automobiles and a high-solid paint during coating and gives a coating film having excellent finished appearance, hardness and resistance to chipping and water, containing a specified urethane-modified polyester resin as a film-forming component. CONSTITUTION:A polyester resin (A) having a number-average MW of 500-1,500 an OH group value of 100-225 and an acid value of 5-20 is synthe sized from 10-45wt.% ring structure component (a) selected from the group consisting of dibasic acids having a ring structure, acid anhydrides having a ring structure and diols having a ring structure, such as 0-phthalic acid, isophthalic acid terephtalic acid, phthalic anhydride, cycle dodecanediol, bisphenol A, etc., and 90-55wt.% compd. (b) having no ring structure, which is a starting material for polyester resins. Two mol of the component A i cou pled with 0.2-1.4mol of a diisocyanate compd. (B) to obtain a urethane-modified polyester resin. 100pts.wt. said resin is blended with 5-100pts.wt. curing agent and optionally, other polyester resin, an epoxy resin, etc., and a pigment, etc.
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