Biaxially oriented polyoxymethylene film
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United States of America Patent
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Aug 7, 1990
Grant Date -
N/A
app pub date -
Jul 20, 1988
filing date -
Jul 21, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is disclosed a biaxially oriented film formed of film forming composition comprising a polyoxymethylene polymer in which the major constituent of the main chains of said polymer each of consists substantially of repeating units of oxymethylene group --CH.sub.2 --O--, said film being characterized in that, when said film is remelted at a temperature above the melting point of said film and the resulting melt is recrystallized isothermally at 140.degree. C. into a solid in film form, the number of polyoxymethylene spherulites in the crystal structure at the surface of the resulting film would be at least 50 per 0.1 mm.sup.2 area of the resulting film surface, as measured with a polarizing microscope through cross-polarizers, and a process for manufacturing the same.
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