STRETCHED POLYPROPYLENE FILM

摘要

Provided is a highly rigid stretched polypropylene film which has low shrinkage ratio comparable to that of a polyethylene terephthalate at 150°C. This stretched polypropylene film is characterized in that: a polypropylene resin that constitutes the film satisfies the conditions (1)-(5) described below, and the lower limit of the plane orientation coefficient of the film is 0.0125. (1) The lower limit of the mesopentad fraction is 96%. (2) The upper limit of the amount of a copolymerization monomer other than propylene is 0.1 mol%. (3) The lower limit of the melt flow rate (MFR) as measured at 230°C under a load of 2.16 kgf is 1 g/10 min. (4) The lower limit of (mass average molecular weight (Mw)/number average molecular weight (Mn)) is 5.5. (5) The lower limit of (z + 1 average molecular weight (Mz+1)/number average molecular weight (Mn)) is 50.