Patent ID: 8618033

Claim:
An ethylene copolymer comprising 40 wt. % to 70 wt. % of units derived from ethylene and at least 30 wt. % of units derived from at least one a-olefin having 3 to 20 carbon atoms, wherein the copolymer has the following properties: (a) a weight-average molecular weight (Mw), as measured by GPC, in the range of about 50,000 to about 200,000 g/mol; (b) a melting point (Tm) in Â° C., as measured by DSC, that satisfies the relation: Tm> 3.4Ã— Eâˆ’ 180 where E is the weight % of units derived from ethylene in the copolymer; (c) a ratio of Mw/Mn of about 1.5 to about 3.5; (d) a content of Group 4 metals of no more than 25 ppm; and (e) a ratio of wt ppm Group 4 metals/wt ppm Group 5 metals of at least 3.