Ethylene polymer useful as a lubricating oil viscosity modifier
AssigneeExxon Research & Engineering Co.
InventorsEdward N. Kresge, Gary W. Ver Strate
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Abstract
An ethylene ter- or tetrapolymer useful as a viscosity modifier and a process for preparing the polymer. The polymer comprises ethylene, an alpha-olefin, a non-conjugated diene and, optionally, a cationically polymerizable monoolefin. The polymerization catalyst comprises a Ziegler catalyst in conjunction with a cationic polymerization catalyst.
Claims15
A process for preparing a polymer from a monomer mixture consisting essentially of ethylene, an alpha-olefin, a non-conjugated diene which has a first site of unsaturation which is coordination catalyst polymerizable and a second site of unsaturation which is cationically polymerizable, and optionally, a cationically polymerizable mono-olefin which comprises utilizing a catalyst system to initiate polymerization wherein the catalyst system comprises:
- (a) a coordination catalyst;
- and
- (b) a cationic polymerization catalyst;
- said polymer being a substantially saturated, long chain ethylene ter- or tetra polymer.
Dependencies are inferred from the claim text.