Title:
高い靭性を有するポリオレフィン組成物
Document Type and Number:
Japanese Patent JP4334357
Kind Code:
B2
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=CHR<1>, where R<1 >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=CHR<2>, where R<2 >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.
Inventors:
Glogovski Todd
Butara Robert G
Han Chun Wai
Ennis Gerald John
Goberty Paolo
Butara Robert G
Han Chun Wai
Ennis Gerald John
Goberty Paolo
Application Number:
JP2003574721A
Publication Date:
September 30, 2009
Filing Date:
March 06, 2003
Export Citation:
Assignee:
Basel, Polyolefin, Italy, Sochieta, A Responsorabilita, Limitata
International Classes:
C08L23/14; C08F4/654; C08L23/08; C08L23/10; C08L23/16
Domestic Patent References:
| JP2002523536A | ||||
| JP11255985A | ||||
| JP7082434A | ||||
| JP7026084A | ||||
| JP3205439A | ||||
| JP3163143A |
Attorney, Agent or Firm:
Kazuo Shamoto
Shinjiro Ono
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Minako Matsuyama
Shinjiro Ono
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Minako Matsuyama
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