Biaxially oriented electrical insulation film having improved shrinkage at elevated temperatures
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United States of America Patent
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Mar 25, 2003
Grant Date -
N/A
app pub date -
Apr 17, 2001
filing date -
Oct 28, 1998
priority date (Note) -
In Force
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Abstract
A biaxially oriented polypropylene film is described. The n-heptane-insoluble content of the film has a chain isotacticity index, measured by 13-C-NMR spectroscopy, of at least 95%. In particular, the film should have the lowest possible shrinkage (transverse shrinkage and longitudinal shrinkage) at elevated temperatures. In addition, a process for the production of the polypropylene film and its use is described.
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