Ethylene polymer useful as a lubricating oil viscosity modifier E-25
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 modifer 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.
Claims21
A lubricating oil composition comprising a lubricating fluid and an amount, effective for improving viscosity, of a thickening agent which comprises a substantially saturated, long chain, branched ethylene tetrapolymer comprising ethylene, an alpha-olefin, a non-conjugated diene monomer having a first site of unsaturation which is coordination catalyst polymerizable and a second site of unsaturation which is cationically polymerizable, and a cationically polymerizable mono-olefin;
- said monomer having a bulk viscosity at 100.degree. C. and strain rate less than 10.sup.-3 sec.sup.-1 which is at least 3 times that of a linear ethylene-propylene polymer having the same intrinsic viscosity and ethylene content.
A lubricating oil composition comprising a lubricating fluid and an amount, effective for improving viscosity, of a thickening agent which comprises a substantially saturated, long chain, branched ethylene terpolymer consisting essentially of ethylene, an alpha-olefin, and a non-conjugated diene monomer having a first site of unsaturation which is coordination catalyst polymerizable and a second site of unsaturation which is cationically polymerizable;
- said polymer having a bulk viscosity at 100.degree. C. and strain rate less than 10.sup.-3 sec .sup.-1 which is at least 3 times that of a linear ethylene-propylene polymer having the same intrinsic viscosity and ethylene content.
Dependencies are inferred from the claim text.