| 摘要 |
PURPOSE: A biaxially oriented polypropylene-base film is provided which is excellent in the straight cuttability in the machine direction, the strength in the transverse direction, and transparency and economically advantageous. CONSTITUTION: A biaxially oriented polypropylene-base film can be produced by biaxially stretching a film-forming material which comprises 40 to 88 wt. % of crystalline polypropylene and 60 to 12 wt. % of a propylene-α-olefin copolymer, the copolymer being dispersed in the crystalline polypropylene in the form of particles, in such a way as to give an oriented film wherein the dispersed particles of the copolymer have a mean particle diameter of 0.1 micrometer or below in the transverse direction. |
