Polyolefin compositions having high tenacity
First Claim
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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Accused Products
Abstract
A polyolefin composition suitable for preparing single ply roofing membranes, 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 containing 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, 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.
The polyolefin composition of the invention, preferably prepared by sequential polymerization in at least three stages, has tensile strength at break ≧25 MPa, elongation at break ≧700 MPa and toughness ≧150 MPa.
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Citations
14 Claims
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1. A polyolefin composition comprising:
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(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.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification