Multilayer polyester film
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United States of America Patent
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Mar 20, 2001
Issued Date -
N/A
app pub date -
Sep 15, 1998
filing date -
Mar 8, 1996
priority date (Note) -
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Abstract
A multilayer polyester film having at least 7 layers which comprises alternating layers of polyethylene terephthalate and polyethylene naphthalate. Biaxial orientation and subsequent restrained heat setting of these materials results in thin films with tensile moduli in both stretch directions well in excess of the values obtained with monolithic films of either material. In some embodiments, a slippery surface is imparted to the film without the use of conventional slip agents.
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