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    • 3. 发明授权
    • Multilayer heat-shrinkable sealable films
    • 多层热收缩密封膜
    • US06727000B2
    • 2004-04-27
    • US09979470
    • 2001-11-20
    • Anne-Marie JolyEnrico Beccarini
    • Anne-Marie JolyEnrico Beccarini
    • B32B2708
    • B32B27/32B65D75/002Y10S428/91Y10T428/2495Y10T428/31909Y10T428/31913Y10T428/31917Y10T428/31924Y10T428/31938
    • Multilayer heat-shrinkable films in which the skin layers A consist of a polyolefin selected from: A1) a composition containing 25-45% b.w. of a random copolymer of propylene with ethylene and 55-75% b.w. of a random terpolymer of propylene, ethylene and one or more C4-C10 alpha-olefins; and A2) random copolymer(s) of propylene and one or more C4-C10 alpha-olefins. Core layer B comprises a heterophasic composition comprising: a) 20-60% b.w. of a propylene homopolymer with an isotacticity index higher than 80 or of a propylene crystalline copolymer with ethylene and/or C4-C10 alpha-olefins containing at least 85% b.w. of propylene units and having an isotacticity index of at least 80 or of mixtures thereof and b) 40-80% b.w. of an ethylene copolymer with propylene and/or 1-butene and possibly a diene, containing 20-60% b.w. of ethylene units and completely soluble in xylene at 25° C.
    • 多层热收缩膜,其中表层A由选自以下的聚烯烃组成:A1)含有25-45%b.w的组合物。 丙烯与乙烯和55-75%b.w的无规共聚物。 丙烯,乙烯和一种或多种C 4 -C 10α-烯烃的无规三元共聚物; 和A2)丙烯和一种或多种C 4 -C 10α-烯烃的无规共聚物。 芯层B包含多相组合物,其包含:a)20-60%b.w. 的等规度指数高于80的丙烯均聚物或含有至少85%b.w的乙烯和/或C 4 -C 10α-烯烃的丙烯结晶共聚物。 的丙烯单元并且具有至少80的全同立构规整度指数或其混合物,以及b)40-80%b.w。 的乙烯共聚物与丙烯和/或1-丁烯以及可能的二烯,含有20-60%b.w。 的乙烯单元,并在25℃完全溶于二甲苯