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    • 5. 发明授权
    • Soft polyolefin compositions with improved flow
    • 具有改善流动性的软聚烯烃组合物
    • US07294674B2
    • 2007-11-13
    • US10507250
    • 2003-03-05
    • Anteo PelliconiAntonella Angelini
    • Anteo PelliconiAntonella Angelini
    • C08L23/04C08L23/10C08L23/16
    • C08L23/16C08L23/142C08L2205/02C08L2308/00C08L2666/06
    • A polyolefin composition suitable for preparing films and sheets, comprising: (A) from 15 to 40% by weight of a crystalline copolymer of propylene with at least one alpha-olefin of formula H2C═CHR1, where R1 is H or a C2-8 linear or branched alkyl, containing at least 90% by weight of propylene, having solubility in xylene at room temperature lower than 15% by weight; (B) from 60 to 85% by weight of an elastomeric fraction comprising: (1) a copolymer of propylene with ethylene, optionally containing 0.5 to 5% by weight of a diene, containing from 20 to 35% by weight ethylene, and having solubility in xylene at room temperature greater than 45% by weight, the intrinsic viscosity of the xylene soluble fraction ranging from 1.0 to 3.0 dl/g; and (2) a copolymer of ethylene with at least one alpha-olefin of formula H2C═CHR2, where R2 is a C2-8 linear or branched alkyl, optionally containing 0.5 to 5% by weight of a diene, containing 15% to 40% by weight alpha-olefin, and having solubility in xylene at room temperature greater than 35% by weight, the intrinsic viscosity of the xylene soluble fraction ranging from 1.0 to 3.0 dl/g; the (1)/(2) weight ratio ranging from 1:5 to 5:1. The polyolefin composition of the invention, preferably prepared by sequential polymerization in at least three stages, has a flexural modulus lower than 130 MPa, Shore D hardness lower than 40, and MFR≧1.5 g/10 min.
    • 一种适于制备薄膜和片材的聚烯烃组合物,其包含:(A)15至40重量%的丙烯与至少一种式H 2 C-CHR的α-烯烃的结晶共聚物, 其中R 1是H或含有至少90重量%的丙烯的C 2〜2-8直链或支链烷基,其具有溶解度 在二甲苯中室温低于15重量%; (B)60至85重量%的弹性体级分,其包含:(1)丙烯与乙烯的共聚物,任选含有0.5至5重量%的二烯,其含有20至35重量%的乙烯,并且具有 在室温下在二甲苯中的溶解度大于45重量%,二甲苯可溶部分的特性粘度为1.0-3.0dl / g; 和(2)乙烯与至少一种式H 2 C-CHR 2的α-烯烃的共聚物,其中R 2是 C 2-8直链或支链烷基,任选地含有0.5至5重量%的二烯,含有15重量%至40重量%的α-烯烃,并且在室温下在二甲苯中的溶解度大于 35重量%,二甲苯可溶成分的特性粘度为1.0〜3.0dl / g; (1)/(2)重量比为1:5至5:1。 本发明的聚烯烃组合物,优选通过至少三个阶段的顺序聚合制备,其挠曲模量低于130MPa,肖氏D硬度低于40,MFR> = 1.5g / 10min。