Copolymerized polyester resin composition and stretched film

摘要

A copolymerized polyester resin composition comprising the following polyethylene terephthalate resin (A) and a polybutylene terephthalate resin (B), wherein the proportion of the resin (A) is from 50 to 95 wt%, and the proportion of the resin (B) is from 5 to 50 wt%, based on the total amount of the resins (A) and (B): Resin (A): a copolymerized polyethylene terephthalate resin, having a dicarboxylic acid component containing terephthalic acid as the main component and a diol component containing ethylene glycol as the main component copolymerized, wherein the dicarboxylic acid component contains isophthalic acid in an amount of from 3 to 30 mol% based on the total dicarboxylic acid component, and the diol component contains a cyclohexane dimethanol in an amount of from 3 to 40 mol% based on the total diol component.