Heat-shrinkable polyester film, packages, and process for production of heat-shrinkable polyester film
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United States of America Patent
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Jul 14, 2015
Grant Date -
Jan 10, 2013
app pub date -
Mar 8, 2011
filing date -
Mar 15, 2010
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Disclosed is a heat-shrinkable polyester film which, even when stored in an outside warehouse which is not temperature-controlled during a hot summer, does not result in the film shrinking (so-called natural shrinkage); which further has a low decrease in shrinkage rate in the main shrinkage direction, and which can be attached aesthetically and efficiently without changing the temperature conditions for causing heat shrinkage when attaching as a label by heat-shrinking the same to a container (e.g., a plastic bottle). The disclosed heat-shrinkable polyester film comprises a polyester resin having ethylene terephthalate as a main component and containing at least 7 mol % of at least one monomer capable of forming an amorphous component in the whole component of polyester resin. In the heat-shrinkable polyester film, the 80° C.-120° C. glycerin shrinkage, the natural shrinkage rate after high temperature aging, and the number of initial break age after high-temperature aging are adjusted within a specific range.
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