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    • 9. 发明授权
    • Multilayer polypropylene-based packaging film and its use
    • 多层聚丙烯基包装膜及其用途
    • US5837369A
    • 1998-11-17
    • US724229
    • 1996-09-27
    • Manfred GrunbergerPaul De MinkAnton Wolfsberger
    • Manfred GrunbergerPaul De MinkAnton Wolfsberger
    • B65D65/40B32B7/06B32B9/00B32B27/08B32B27/32C08L23/00C08L23/04C08L23/10C08L23/12C08L23/14C08L23/16C08L53/00C09D153/00C09J123/10B32B7/12
    • C08L23/142B32B27/08C08L23/04C08L23/10C08L53/00C09D153/00C09J123/10C08L2205/02C08L2207/14C08L23/12C08L23/16Y10T428/2826Y10T428/31899Y10T428/31902Y10T428/31913
    • A packaging film which comprises a) a sealing ply comprising a mixture of a.sub.1) 40 to 80% by weight of a C.sub.2 -C.sub.3 random copolymer having a C.sub.2 content of 1-15% by weight or a.sub.2) 40 to 80% by weight of a polymer blend consisting of a.sub.2.1) 60 to 98% by weight of a crystalline copolymer of propylene with ethylene and/or an .alpha.-olefin of the general formula CH.sub.2 =CHR, where R is a linear or branched alkyl radical having 2-8 carbon atoms, containing 85-99.5% by weight of propylene, and a.sub.2.2) 2 to 40% by weight of a resilient copolymer of ethylene with propylene and/or an .alpha.-olefin of the general formula CH.sub.2 =CHR, containing 20-70% by weight of ethylene, or a.sub.3) 40 to 80% by weight of a highly amorphous polypropylene having a crystalline polypropylene fraction of up to 10% by weight with an enthalpy of fusion of not more than 40 J/g and a melt flow index between 0.1 and 100 g/10 min, where the polypropylene may be a homopolymer of propylene or a copolymer of propylene with one or more .alpha.-olefins and with a propylene fraction of at least 80 mol %, and a.sub.4) 20 to 60% by weight of an ethylene polymer and b) a monolayer or multilayer base ply comprising thermoplastic polymers, the packaging film being peelable after sealing against a polypropylene ply with a force of not more than 30N/15 mm, and its use.
    • 一种包装膜,其包括a)密封层,其包含a1)40至80重量%的C2含量为1-15重量%的C2-C3无规共聚物的混合物,或a2)40至80重量% 由以下组成的聚合物共混物:(a)(b)60至98重量%的丙烯与乙烯和/或通式CH 2 = CHR的α-烯烃的结晶共聚物,其中R是具有2- 8个碳原子,含有85-99.5重量%的丙烯,和a2.2)2-40重量%的乙烯与丙烯和/或通式CH 2 = CHR的α-烯烃的弹性共聚物,其含有20 -70重量%的乙烯,或a3)40-80重量%的结晶聚丙烯组分高达10重量%,熔体焓不超过40J / g的高度无定形的聚丙烯和熔体 流量指数在0.1至100g / 10min之间,其中聚丙烯可以是丙烯的均聚物或丙烯与一种或多种α-烯烃的共聚物 翅片,丙烯馏分为至少80摩尔%,和a4)20至60重量%的乙烯聚合物,以及b)包含热塑性聚合物的单层或多层底层,所述包装膜在密封聚丙烯层之后是可剥离的 用力不超过30N / 15毫米,并使用。