Process for producing transparent and heat-resistant polyester containers

摘要: A process for producing a transparent and heat-resistant container includes forming sheet from melt of polyester resin having at least 80 mole % ester units derived 1,3-propanediol terephthalic acid or an ester-forming derivative thereof. The formed is quenched solidified so as to have relatively low crystallinity (i.e., less than 50%). film then aged shaped by thermoforming obtain high greater 50%, preferably 80%). aging step most conducted temperature which satisfies the relationship represented following equation (1): Ta≦Tcc wherein Ta (°C.), Tcc cold crystallization (°C.) determined differential thermal analysis rate increase 10° C./min. Moreover, practiced such that satisifies (2): (ΔHcc)a≧5.0 (J/g) (ΔHcc)a heat