Food package comprised of polymer with thermally responsive perm

Details Food package comprised of polymer with thermally responsive perm Food package comprised of polymer with thermally responsive perm

1992-05-18

1993-10-19

Weinstein, Steven

Food or edible material: processes, compositions, and products

Packaged or wrapped product

426415, 426418, 426419, 428 354, B65D 8500

Patent

active

052543544

ABSTRACT:
Food may be packaged and preserved for extended periods using intelligent polymers formed into food containers which have specific and variable gas permeabilities. The polymers used in forming the food packages are intelligent in that they have permeabilities which may be radically and reversibly changed by relatively small changes in temperature. By using different types and formulations of polymers and various temperatures, it is possible to create an environment within the food package which adjusts to the respiration of the food so as to best preserve the color, quality and/or shelf life of the food. The polymers are side-chain crystallizable polymers designed and formulated so as to provide a material which is substantially impermeable to a gas such as oxygen, carbon dioxide or water vapor at a temperature below a given phase transition point and permeable to the same gas at a temperature above that point.

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