POLYPROPYLENE ORIENTED FILM

摘要

PURPOSE:To obtain an oriented film optically uniform with an excellent see- through effect without impairing characteristics and film forming property intrinsic to the polypropylene resin by melting the polypropylene resin containing a specified a-olefine to form a film before stretching. CONSTITUTION:A polypropylene resin containing 0.5ppm-1wt% of a polymer of trivalent branched a-olefin with the number of carbon atoms exceeding 6 or vinyl cycloalkane is drawn at least uniaxially. The content of the polymer of the trivalent branched a-olefine having 6C- or vinyl cycloalkane to be added is preferably limited as much as possible to avoid changes in the intrinsic physical property of the polypropylene. In short, the content of the a-olefine is preferably in the range of 0.5ppm-5,000ppm. A specific compound of the trivalent branched a-olefine having 6C- or vinyl cycloalkane is rather preferably a-olefine having 8C and above.