| 摘要 |
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 .degree.C to 80 .degree.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 .degree.C to about 200 .degree.C. |
