| abstract |
(57) [Summary] (Modified) [Problem] A biaxially oriented polypropylene film based on a metallocene. A biaxially oriented film comprising a metallocene-catalyzed polypropylene with a proximally substituted racemic bridged bis (indenyl) ligand. Polypropylene contains 0.5-2% of 2,1 inserts and has at least 96% mesopentad and at least 9 mesodiads. 9% isotacticity with an MFI of 5 g / 10 The biaxially oriented film having a Mw of less than 100,000-400,000 has a peak value of less than 160 ° C., an inhomogeneous melting temperature of less than 160 ° C., a thickness of 18 μm, a machine direction secant coefficient of at least 1400 MPa, and a transverse direction. The secant coefficient is at least 2200 MPa, the dynamic friction coefficient between the films is 0.5 or less, and the water permeability and the oxygen permeability are each 2.6 g. / M 2 / day or less, 2400 c 3 / m 2 / day or less. Further, the stretch ratio at 140 ° C. is at least 8% in the machine direction and at least 16% in the transverse direction. |