HEAT-SHRINKABLE POLYESTER FILM
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United States of America Patent
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Issued Date -
Sep 1, 2022
app pub date -
Jul 17, 2020
filing date -
Jul 26, 2019
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Abstract
A heat-shrinkable polyester film that has (1) a hot-water heat shrinkage of 40% or more in a main shrinkage direction of the film when immersed in hot water of 98° C. for 10 seconds; (2) a planar orientation coefficient of 0.035-0.070; (3) ethylene terephthalate as a main constituent component and 6-25 mol % diethylene glycol (DEG) constituent in 100 mol % of polyhydric alcohol in all the polyester resin constituting the film; (4) a maximum shrinkage stress of 2-17 MPa in the main shrinkage direction of the film when measured in hot air of 90° C.; and (5) a tensile elongation at break of 20% or more in a direction orthogonal to the main shrinkage direction after the film is aged in an atmosphere with an atmospheric temperature of 40° C. and a relative humidity of 85% for 28 days.
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