Polyolefin compositions having high tenacity
US6743864B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2003 |
| Grant date | Jun 1, 2004 |
| Priority date | — |
| Expiry date | Mar 4, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2308/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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 ab…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.