| abstract |
(57) [Summary] [Purpose] To provide a resin composition for coatings, which is a biodegradable polymer, has excellent water resistance and weather resistance, and is excellent in solvent solubility. [Structure] A polyester resin (A) obtained by copolymerizing lactic acid, (I) a dicarboxylic acid having 2 to 30 carbon atoms, and (II) a glycol having 2 to 30 carbon atoms, and the proportion of lactic acid in the resin. Of 40 to 95 mol% and a glass transition temperature of 7 0 ° C or less, reduced viscosity of 0.30 dl / g or more, acid value of 3 A resin composition for a biodegradable coating material, which has an amount of not more than 00 equivalent / 10 6 g. |