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    • 4. 发明公开
    • UNSTRETCHED POLYPROPYLENE MOLDING
    • UNGESTRECKTE POLYPROPYLEN-FORMASSE
    • EP0982352A4
    • 2000-12-13
    • EP98919546
    • 1998-05-11
    • CHISSO CORP
    • OKAYAMA CHIKASHINAKASHIMA TAKANORIISHIMOTO YUYANAKATA SHINJIMOCHIZUKI YASUHIROAKITAYA SHINICHISUMI YOSHITAKA
    • C08J5/18C08L23/10C08L23/12C08L23/16
    • C08J5/18C08J2323/10C08L23/10C08L23/12C08L23/16C08L2666/04
    • An unstretched polypropylene film or sheet possessing excellent impact resistance, transparency, and heat resistance at low temperature and, in addition, excellent tear strength and/or whitening resistance. The film or sheet is prepared by subjecting a molding material comprising a polypropylene resin material comprising 40 to 80 % by weight of crystalline polypropylene and 60 to 20 % by weight of a propylene-α-olefin copolymer comprising 20 to 80 % by weight of propylene polymer units to molding into a film or a sheet without stretching so that the aspect ratio defined as the ratio of the average dispersion major axis (L) in the section of the machine direction of the copolymer particle to the average diameter of dispersed particles (D) in the thicknesswise direction of the molding, that is, L/D, is not less than 30 and the average diameter of dispersed particles is not more than 0.3 νm.
    • 在低温下具有优异的抗冲击性,透明性,低温耐热性和优异的撕裂强度和/或耐应力增白性的无取向聚丙烯类膜或片。 一种成型材料,其包含聚丙烯基树脂材料,其包含40至80重量%的结晶聚丙烯和60至20重量%的含有20至80重量%丙烯聚合单元的丙烯-α-烯烃共聚物, 作为颗粒分散在结晶聚丙烯中的α-烯烃共聚物是非取向成型的,以提供薄膜状或片状模制品,其中粒径具有平均分散颗粒长度(L)至平均值的纵横比(L / D) 分散粒径沿成型体(D)的厚度为30以上,沿着MD方向在成形体的截面中,平均分散粒径为0.3μm以下。
    • 9. 发明专利
    • DE69902081D1
    • 2002-08-14
    • DE69902081
    • 1999-04-02
    • CHISSO CORP
    • NAKATA SHINJIKUGIMIYA YOUICHIOKAYAMA CHIKASHINAKASHIMA TAKANORIANDO YUJI
    • B29C55/04C08J5/18C08L23/10C08L23/12C08L23/14C08L23/16C08L23/08B32B27/32B29C55/02
    • An object of the present invention is to provide a drawn polypropylene film as a wrapping material that has transparency and mechanical properties sufficient as a wrapping material yet having permeability of gases need for maintaining the freshness of the enclosed goods and in addition that enables control of permeability of gases to a certain proportion if needed even if secondary steps such as perforation processing, etc. is eliminated. The present invention provides a drawn polypropylene film drawn at least in a monoaxial direction, which comprises a propylene resin composition comprising a propylene polymer component and a copolymer component containing ethylene and propylene, wherein a content of the copolymer component is 7 to 70% by weight based on the weight of the composition, and the film has a thickness ÄD1Ü of 1.0 to 100 mu m and has the following characteristics (1) to (3): (1) ÄTH2OÜ(a permeability of water vapor) = 9 - 50 (unit: g/m . 24 Hr, in accordance with JIS Z-0208), (2) ÄTO2Ü(a permeability of oxygen gas) = 600 - 12,500 (unit: nmol (STP)/m . s . 100 kPa, in accordance with JIS K-7126A) (3) ÄTethyleneÜ(a permeability of ethylene gas) = 600 - 22,500 (unit: nmol (STP)/m . s . 100 kPa, in accordance with JIS K-7126A)