POLYESTER RESIN USEFUL FOR COATING FOR AUTOMOBILE INTERMEDIATE COAT

摘要

PURPOSE: Provided is a polyester resin for coating which comprises polyesters modified by mixing typical polyesters with aliphatic diisocyanates, and which has substantially improved chipping property. CONSTITUTION: The polyester resin comprises (a) a first polyester resin consisting of difunctional carboxylic acid or its ester-forming derivatives, and alkylene glycol of C2-C10; and (b) a second polyester resin modified by adding an aliphatic diisocyanate and polycaprolactone polyol or polymethacrylate diol to the polyester resin(the polyester resin (a)) consisting of aliphatic linear carboxylic acid of C2-C8 and alkylene glycol of C2-C10. The polyester resin consists of 70 wt% of the first polyester resin and 30 wt% of the second polyester resin.