Breathable packaging film having enhanced thermoformability
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United States of America Patent
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May 28, 2013
Grant Date -
Mar 26, 2009
app pub date -
Dec 3, 2008
filing date -
Nov 17, 2004
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Abstract
The present invention describes thermoformable coextruded film suitable for use in packaging applications having at least a first polymeric layer serving as an outermost exterior-film layer and comprising a cycloaliphatic polyester, an aromatic polyester or blends thereof; a second polymeric layer serving as a thermoforming-assist layer and comprising a polyolefin; and a third polymeric layer serving as an innermost exterior-film layer and comprising a heat-sealing polyolefin material. The films of the present invention are oxygen-permeable in that they exhibit an oxygen transmission rate of between 32-1000 cm3/100 in2/24 h. atm.
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