Polyester Film Having Latent Shrink Properties and Process for Producing Same
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United States of America Patent
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app pub date -
Nov 17, 2008
filing date -
Nov 21, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A film layer is disclosed that is capable of shrinking when subjected to energy, such as heat. The film layer, for instance, can be formed and then stretched in one or two directions at a relatively low temperature. In particular, the film is stretched while the film layer is at a temperature near the glass transition temperature of the polymer used to form the film. Drawing the film at a relatively low temperature has been found to improve the shrink properties of the film. In one embodiment, the film layer is comprised of a non-modified polyester, such as polyethylene terephthalate. For example, the polyethylene terephthalate can be made by reacting terephthalic acid with ethylene glycol or polyethylene glycol.
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International Classification(s)
- C08G:MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN B....
- B29C:SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTAN....
- C08L:COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- B65B:MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF,....
- B32B:LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA....
- C08K:USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUB....
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