Polyester und aus der Schmelze hergestellte Artikel

摘要

The polyester resin of the present invention is produced by polymerizing a monomer mixture comprising a glycol component containing 5 to 60 mol% of a spiroglycol represented by Formula I: and 30 to 95 mol% of ethylene glycol, and a dicarboxylic acid component containing 80 to 100 mol% of terephthalic acid and/or an ester thereof. The polyester resin has (1) an intrinsic viscosity of 0.4 to 1.5 dL/g, (2) a melt viscosity of 700 to 5,000 Pa.s, (3) a molecular weight distribution of 2.5 to 12.0; and (4) a glass transition temperature of 90 DEG C or higher and a cooling crystallization exotherm peak of 5 J/g or lower. The polyester resin of the present invention is excellent in heat resistance, transparency, mechanical properties, moldability and fabrication qualities and useful for producing shaped articles such as films, sheets, hollow containers and foamed products.