Polar grafted polyolefins, methods for their manufacture, and lu

Details Polar grafted polyolefins, methods for their manufacture, and lu Polar grafted polyolefins, methods for their manufacture, and lu

1994-10-21

1996-06-04

McAvoy, Ellen M.

Compositions

Electrolytes for electrical devices

252 515R, 252 515A, 525279, 525281, 525282, 525283, 525293, 525296, 525309, 525315, C10M14910, C08F27902

Patent

active

055230083

ABSTRACT:
A grafted polyolefin containing at least about 13 moles of N-vinylimidazole or other ethylenically-unsaturated nitrogen-containing and/or oxygen-containing monomers per mole of a grafted polyolefin backbone is disclosed. The graft polyolefin has a weight average molecular weight of from about 20,000 to about 500,000 and a polydispersity of less than about 10. The grafted polyolefin can alternatively be defined as containing more than about 1.2% by weight of grafted monomer on a polyolefin. Also described is a lubricating oil comprising a lubricant base oil and a grafted polyolefin as described above. Also described is a method of making a dispersant-viscosity index improver. N-vinylimidazole or other ethylenically unsaturated nitrogen-containing and/or oxygen-containing monomers and a graftable polyolefin are reacted with enough of an initiator to graft at least about 13 moles of the monomer to each mole of the polyolefin.

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