Biaxially oriented nylon film and process for production of biaxially oriented nylon film
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United States of America Patent
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May 21, 2013
Grant Date -
Apr 26, 2012
app pub date -
Dec 28, 2011
filing date -
Aug 14, 2006
priority date (Note) -
Expired
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Abstract
Biaxially-oriented nylon film according to the present invention is biaxially-oriented nylon film made from nylon. In the biaxially-oriented nylon film, an elongation ratio of the film in each of four directions (an MD direction, a TD direction, a 45 degree direction and a 135 degree direction) until a film rupture is 70 percent or more, the elongation ratio being measured in a tensile test (testing conditions: a sample width is 15 mm; a distance between gauge points is 50 mm; and a tensile speed is 100 mm/min), and a stress ratio A (σ1/σ2) between a tensile stress σ1 and a tensile stress σ2 in a stress-strain curve obtained in the tensile test of the film is 2 or more in each of the four directions, the tensile stress σ1 being a value at a point where the elongation ratio becomes 50 percent while the tensile stress σ2 being a value at an yield point.
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