STRETCHED POLYPROPYLENE FILM

摘要

A stretched polypropylene film that has a low shrinkage factor at 150°C that is comparable to that of polyethylene terephthalate (PET), the stretched polypropylene film being a stretched film that uses a propylene polymer satisfying conditions (a)—(c) and that satisfies conditions (d) and (e). (a) Meso pentad fraction is 96% or more. (b) Non-propylene comonomer content is 0.5 mol% or less. (c) Melt flow rate (MFR) is 0.5g/10 min. or more and 20g/10 min. or less. (d) When polypropyleneα-crystal (110) surface scattering intensity as measured by wide-angle x-ray scattering is plotted against azimuth angle, the half width of the largest peak is 30 degrees or less. (e) Melting endothermic peak area (total heat of fusion) as measured using differential scanning calorimetry at a rate of temperature increase of 20°C/min. is 115J/g or more, and the ratio (heat of fusion at 150°C/total heat of fusion) of area at 150°C or less (heat of fusion at 150°C) to total heat of fusion is 0.12 or less.