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Polyolefin compositions having high tenacity

  • US 6,743,864 B2
  • Filed: 03/04/2003
  • Issued: 06/01/2004
  • Est. Priority Date: 03/12/2002
  • Status: Expired due to Term
First Claim
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1. A polyolefin composition comprising:

  • (A) from about 15 to about 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 about 90% by weight of propylene, having solubility in xylene at room temperature lower than about 15% by weight;

    (B) from about 60 to about 85% by weight of an elastomeric fraction comprising;

    (1) a copolymer of propylene with ethylene, optionally containing about 0.5 to 5% by weight of a diene, containing from about 20 to about 35% by weight ethylene and having solubility in xylene at room temperature greater than about 70% by weight, the intrinsic viscosity of the xylene soluble fraction being higher than about 3.0 dl/g up to about 6.0 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 about 0.5 to 5% by weight of a diene, containing about 15% to 40% by weight alpha-olefin, and having solubility in xylene at room temperature greater than about 25% by weight, the intrinsic viscosity of the xylene soluble fraction ranging from about 0.5 to about 5.0 dl/g;

    the (1)/(2) weight ratio ranging from about 1;

    5 to about 5;

    1.

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