POLYESTER RESIN COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a polyester resin composition having good mold releasability from a heat-treating metal mold during molding of blow molded products, scarcely staining the metal mold and excellent long-time continuous moldability and affording the blow molded products having excellent transparency and heat-resistant dimensional stability. SOLUTION: This polyester resin composition comprises an aromatic polyester having repeating units mainly composed of an aromatic dicarboxylic acid component and a glycol component and a silica having >=300 m<2> /g surface area. The polyester resin composition is characterized in that an increase in cyclic trimers is <=0.45% when melted at 290 deg.C temperature for 60 min.