| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a biaxially oriented polypropylene film that has an excellent tensile rigidity although it has a low flexural rigidity and is flexible, and therefore can be used suitably as a mold release film.SOLUTION: This invention provides a biaxially oriented polypropylene film in which the sum Eof a tensile elasticity Ein film longitudinal direction and a tensile elasticity Ein film width direction is 2.0 GPa or more and 5.0 GPa or less, and the sum Rof a loop stiffness Rin film longitudinal direction and a loop stiffness Rin film width direction is 20 mg or more and 300 mg or less.</p> |
