Exxonmobil Chemical Patents Inc.

Henry Dong

Jeffrey Lawrence Brinen

Daniel L Bilbao

Carlos U De Gracia

This invention relates to a copolymer prepared using two or more non-coordinating anion activators comprising a first C2 to C12 alpha olefin (such as ethylene), a second C3 to C12 alpha olefin (such as propylene) different from the first alpha olefin, and diene (such as ethylidene norbornene and/or vinyl norbornene), where the polymer has: a) first alpha olefin (ethylene) content of 35 to 90 mol %; b) second alpha olefin (propylene) content of 9.8 to 64.8 mol %; c) diene content of 0.2 to 5 mol %; d) a branching index g'ave of 0.95 or more; e) a complex viscosity ratio (eta*(0.01 rad/s)/eta*(100 rad/s), at 125&#xb0; C.) greater than 1.1*Y, where Y=Y+{[(Y&#x2212;Y)/(X&#x2212;X)](X&#x2212;X)}, where Xis the wt % of a first non-coordinating anion activator, NCA, used to prepare the copolymer (based upon weight of NCAand a second non-coordinating anion activator, NCA, used to prepare the copolymer), X=0, X=100, Y=complex viscosity ratio of polymer made with 100% NCAand 0% NCA, Yis complex viscosity ratio of polymer made with 100% NCAand 0% NCA, where NCAhas an Mw lower than the Mw of NCA; f) an Mw/Mn of 4.0 or less; g) a melting point of 30&#xb0; C. or less; and h) a Composition Distribution Breadth Index of 50% or more.

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Stafford, TX, United States of America

Henry Dong