Process for producing elevated temperature dimensionally stable

Details Process for producing elevated temperature dimensionally stable Process for producing elevated temperature dimensionally stable

1993-04-16

1994-10-04

Acquah, Samuel A.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

528272, 528298, 528308, 5283086, 525437, 525444, 428 341, 428 347, 428 349, 428 357, 428 3692, 264299, 2643281, 26432814, 26432817, 26433121, C08J 500

Patent

active

053524012

ABSTRACT:
The invention provides a process of manufacturing a shaped polyester article having an oxygen permeability of from about 0.2 to about 4.9 cc-mil/100 in.sup.2 -24 hr-atm at a temperature of 23.degree. C. and at 100% relative humidity inside and 60% relative humidity outside, and an enthalpy of recrystallization of from about 0 to about -2.1 cal/g, as well as a linear dimensional shrinkage between about 0% and 6% when heated from about -60.degree. C. to about 200.degree. C. The crystalline polyester articles are useful as containers for microwavable, ovenable and/or frozen foods, and have good gas barrier properties, and post-mold dimensional stability from about -60.degree. C. to about 200.degree. C.

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