PREFORM, PROCESS FOR PRODUCING THE SAME, AND BIAXIALLY STRETCHED CONTAINER OBTAINED FROM THE PREFORM

摘要

A preform and a container formed from the preform by stretch molding. The preform has at least a layer comprising a polyester resin and has been formed by compression molding. The time required for the layer comprising a polyester resin to come to have a maximum value of the quantity of heat of isothermal crystallization at 210°C is 300 seconds or longer. The resin is hence inhibited from suffering pyrolysis during molding for producing the preform. The preform is effectively inhibited from suffering a decrease in intrinsic viscosity or generating acetaldehyde. A biaxially stretched container excellent in mechanical strength and flavor retention can be provided.