| US 7,605,217 B2 | ||
| High strength propylene-based elastomers and uses thereof | ||
| Sudhin Datta, Houston, Tex. (US); and Abdelhadi Sahnoune, Houston, Tex. (US) | ||
| Assigned to ExxonMobil Chemical Patents Inc., Houston, Tex. (US) | ||
| Filed on Nov. 12, 2004, as Appl. No. 10/988,162. | ||
| Claims priority of provisional application 60/519975, filed on Nov. 14, 2003. | ||
| Prior Publication US 2005/0131142 A1, Jun. 16, 2005 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. C08F 210/18 (2006.01) | ||
| U.S. Cl. 526—339 [526/335; 526/281; 526/280; 525/331.7] | 17 Claims |
| 1. A crosslinked elastomer comprising:
(a) propylene-derived units in an amount of at least 75 wt %, based on the combined weight of components (a), (b), and (c);
(b) ethylene-derived units in an amount of at least 5 wt %, based on the combined weight of components (a), (b), and (c);
and
(c) diene-derived units in an amount of from 0.3 to 10 wt %, based on the combined weight of components (a), (b), and (c);
where the diene is selected from the group consisting of 5-ethylidene-2-norbornene, 5-vinyl-2-norbornene, divinyl benzene,
and dicyclopentadiene; and
wherein the elastomer has an isotactic propylene triad tacticity of from 65 to 95%, a melting point by DSC equal to or less
than 110° C., a heat of fusion of from 5 J/g to 50 J/g, an ultimate tensile strength of 1 MPa or greater, a Die C tear strength
of 50 lb/in or greater, and a ratio of Shore A hardness to MFR@230° C. prior to crosslinking of 160 or less.
|