Copolyester and polyester resin composition comprising said copolyester

摘要

The present invention relates to a polyethylene terephthalate based copolyester modified by aliphatic dicarboxylic acid containing not less than 9 carbon atoms and poly(tetramethylene oxide)glycol, and to a polyester resin composition comprising said copolyester. Said polyester resin composition exhibits excellent toughness, impact strength and moldability without harming the inherent characteristics of polyethylene terephthlate.