C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 63/16 (2006.01) B29B 13/00 (2006.01) B29C 49/00 (2006.01) B65D 81/34 (2006.01) C08G 63/88 (2006.01) C08L 67/02 (2006.01) B29C 71/00 (2006.01) C08L 101/00 (2006.01)
Patent
CA 2129446
The invention provides crystalline polyester articles having an oxygen permeability of from about 0.2 to about 4.9 cc-mil/ (00 in2-24 hr-atm, and an enthalpy of recrystallization of from about 0 to about -2.1 cal/g. They are prepared by; a) heating a crystallizable polyester above the temperature of its peak rate of crystallization from melt, b) shaping it at or above this crystallization temperature in a heated form and c) cooling it at a rate of about 5 °C to 80 °C per minute. The polyester articles are useful as containers for microwavable, ovenable and/or frozen foods. They have good gas barrier properties, and postmold dimensional sta bility from about -60 °C to about 200 °C.
Bond John
Dalgewicz Edward J. III
Freundlich Richard A.
Lawson Mardon Thermaplate Corporation
Sim & Mcburney
Therma-Plate Corporation
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