| 摘要 |
PROBLEM TO BE SOLVED: To enable baking at low temperatures, improve curing properties and storage stability, and enable forming a coating with a good appearance by specifying an acid component, an alcohol component and physical properties. SOLUTION: This polyester resin comprises an acid component including an aromatic dicarboxylic acid as a main component and a glycol component mainly comprising an aliphatic glycol, and has a limiting viscosity of 0.10-0.30 dl/g, an acid value of 30-85 mgKOH/g and a melt viscosity at 150 deg.C of 100-800 dPa.s. Furthermore, the resin contains, as copolymerization components, (A) an aliphatic dicarboxylic acid, (B) an aromatic glycol and (C) a carboxylic acid having a functionality of 3 or more and the blending ratio is such that the ratio of component A to the total acid components is 5-25 mol%, the ratio of component B to the total glycol components is 10-45 mol% and that of component C to the total acid components is 1-10 mol%. Based on 100 pts.wt. the total of the polyester resin and an epoxy resin-based curing agent, 0.4-1.0 pts.wt. of an imidazole-based curing accelerator is blended to obtain the objective resin composition.
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