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    • 4. 发明授权
    • Multi-layer stretch wrapping film
    • 多层拉伸包装膜
    • US6033775A
    • 2000-03-07
    • US980456
    • 1997-11-28
    • Haruo HayashidaEisuke ShirataniIkuo YamamotoAkihiro Ichige
    • Haruo HayashidaEisuke ShirataniIkuo YamamotoAkihiro Ichige
    • B32B27/32C08F297/08C08L23/02C08L53/00B32B27/08B32B7/12
    • C08L53/00B32B27/32C08F297/083C08L23/02Y10S428/91Y10T428/2826Y10T428/31913Y10T428/31928
    • A film containing a first layer containing a propylene-based block copolymer (a) obtainable by forming 40 to 85% by weight of a propylene-ethylene copolymer portion (A) having a content of repeating unit derived from ethylene of 1.5 to 6.0% by weight in a first step, and then forming 15 to 60% by weight of a propylene-ethylene copolymer portion (B) having a content of repeating unit derived from ethylene of 7 to 17% by weight in a second step, the intrinsic viscosity of portion (B) being 2 to 5 dl/g, and the ratio of the intrinsic viscosity of portion (B) to the intrinsic viscosity of portion (A) being 0.5 to 1.8, and a second layer containing a polyethylene type resin (b) laminated on at least one surface of the first layer, has a good balance between heat resistance, flexibility, mechanical strength, transparency, cuttability, original-shape resuming property and other desirable properties, and is suitably used for wrapping materials such as foods.
    • 含有含有丙烯类嵌段共聚物(a)的第一层的膜可以通过将由乙烯衍生的重复单元的含量为1.5〜6.0%的丙烯 - 乙烯共聚物部分(A)的40〜85重量% 重量,然后在第二步中形成15至60重量%的由乙烯重复单元含量为7至17重量%的丙烯 - 乙烯共聚物部分(B)的特性粘度 部分(B)为2〜5dl / g,部分(B)的特性粘度与部分(A)的特性粘度的比例为0.5〜1.8,第二层含有聚乙烯型树脂(b) 层压在第一层的至少一个表面上,在耐热性,柔韧性,机械强度,透明性,可切割性,原始形状恢复性能和其它期望的性能之间具有良好的平衡,并且适合用于包装食品等材料。