URETHANE MODIFIED POLYESTER RESIN COMPOSITION, A PREPARATION METHOD THEREOF AND A PAINT COMPOSITION INCLUDING THE SAME

摘要

PURPOSE: A urethane modified polyester resin composition for use in a surfacer paint for automobiles is provided to obtain a coating having improved surface smoothness and chipping resistance. CONSTITUTION: The urethane modified polyester resin composition comprises 100 parts by weight of a polyester polyol resin and 2 to 20 parts by weight of a diisocyanate compound in the form of an adduct to the polyester polyol resin. In particular, the polyester polyol resin is obtained by polycondensing the mixture comprising alcohol components consisting of 5 to 20 wt% of a trihydroxy or higher polyol, 5 to 30 wt% of polyoxyethylene bisphenol-A and a polyhydric alcohol, and acid components consisting of 10 to 40 wt% of adipic acid, 15 to 45 wt% of isophthalic acid and a polybasic acid, wherein the mixing ratio is based on the solid content of polyester resin and the weight ratio of alcohol components : acid components is 30-70:70-30.