POLYETHYLENE NAPHTHALATE RESIN MOLDED ARTICLE AND PRODUCTION THEREOF

摘要

PROBLEM TO BE SOLVED: To produce a resin molded article that will not develop crazing when stored in ethyl acetate at a specified temperature for a specified period of time by using a polyester resin composed of a naphthalenedicarboxylic acid as a main acid component and ethylene glycol as a main glycol component. SOLUTION: A polyethylene naphthalate(PEN) resin molded article comprises a polyester resin composed of a naphthalenedicarboxylic acid as a main acid component and ethylene glycol as a main glycol component and will not develop crazing when stored in ethyl acetate at 40 deg.C for 12 hr. For example, the PEN resin molded article is produced by feeding a PEN resin into an injection molding machine to form a preform and heat treating a molded article produced by e.g. blow molding the preform after heating, preferably at a temperature of 50-120 deg.C for not less than 0.1 hr. Alternatively, it is preferable to produce a PEN resin molded article at a mold temperature of 50-120 deg.C. The PEN resin molded article is useful as a container for storing the contents including an organic solvent such as a bottle for nail color or the like.