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AssigneeChisso Corporation
InventorsChikashi Okayama, Takanori Nakashima, Noriaki Saito, Hiroyuki Maehara, Yuya Ishimoto
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To provide a uniaxially oriented polypropylene-based film excellent in tensile elongation along the TD direction and transparence, and generating less fibers when it is torn, a film-forming material which comprises a polypropylene-based resin material consisting of 40 to 95% by weight of crystalline polypropylene, and 60 to 5% by weight of propylene-α-olefin copolymer dispersed as particles in the crystalline polypropylene is uniaxially oriented to afford a uniaxially oriented polypropylene-based film, wherein the particles of the copolymer have an aspect ratio (L/D) of mean dispersed particle length (L) to mean dispersed particle diameter along the film thickness direction (D) of 100 or more in a cross section of the film along the MD direction, and the mean dispersed particle diameter of 0.10 μm or less.
A uniaxially oriented polypropylene film formed from a film-forming material which comprises a polypropylene resin material consisting of 40 to 95% by weight of crystalline polypropylene, and 60 to 5% by weight of propylene-α-olefin copolymer dispersed as particles in the crystalline polypropylene, wherein the crystalline polypropylene is a propylene homopolymer or a propylene-α-olefin copolymer having propylene unit content of 90% or more by weight,
A uniaxially oriented polypropylene film formed from a film-forming material which comprises a polypropylene resin material consisting of 40 to 95% by weight of crystalline polypropylene, and 60 to 5% by weight of propylene-α-olefin copolymer dispersed as particles, and has a ratio of 10 or less of MFR of the crystalline polypropylene to that of the propylene-α-olefin copolymer, wherein the film is uniaxially oriented along the MD direction so that the oriented ratio is 3 to 12 times, and wherein the particles of the copolymer have an aspect ratio (L/D) of mean dispersed particle length (L) to mean dispersed particle diameter along the film thickness direction (D) of 100 or more in a cross section of the film along the MD direction, and the mean dispersed particle diameter of 0.10 μm or less.
Dependencies are inferred from the claim text.