Process for producing transparent and heat-resistant polyester c

Details Process for producing transparent and heat-resistant polyester c Process for producing transparent and heat-resistant polyester c

1991-10-04

1993-02-02

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Starting material is nonhollow planar finite length preform...

26421118, 264235, 264237, 264553, B29C 4788, B29C 5102, B29C 5110, B29C 7102

Patent

active

051836238

ABSTRACT:
A process for producing a transparent and heat-resistant container includes forming a sheet from a melt of a polyester resin having at least 80 mole % ester units derived from 1,3-propanediol and terephthalic acid or an ester-forming derivative thereof. The formed sheet is quenched and solidified so as to have relatively low crystallinity (i.e., less than 50%). The solidified low crystallinity film is then aged and shaped by thermoforming to obtain a container having relatively high crystallinity (i.e., greater than 50%, and preferably greater than 80%). The aging step is most preferably conducted at a temperature which satisfies the relationship represented by the following equation (1):

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