| 摘要 |
<p>The present invention relates to a biaxially oriented polypropylene film which comprises a polypropylene having
a) xylene solubles (XS) of at least 0.5 wt.-% and
b) a strain hardening index ( SHI @ 1s -1 ) of at least 0.15 measured at a deformation rate dµ/dt of 1.00 s -1 at a temperature of 180 °C, wherein the strain hardening index (SHI) is defined as the slope of the logarithm to the basis 10 of the tensile stress growth function (lg (· E + )) as function of the logarithm to the basis 10 of the Hencky strain (lg (µ)) in the range of the Hencky strains between 1 and 3.</p> |
