Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Compound of indeterminate structure – prepared by reacting a...
Patent
1995-10-10
1997-09-02
McAvoy, Ellen M.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Compound of indeterminate structure, prepared by reacting a...
508543, 525279, 525281, 525282, 525283, 525293, 525296, 525309, 525315, C10M14910, C08F27902
Patent
active
056631260
ABSTRACT:
A grafted polyolefin containing N-vinylimidazole, 4-vinylpyridine, or other ethylenically-unsaturated nitrogen- or oxygen-containing graftable monomers grafted to a polyolefin copolymer. The grafted polyolefin preferably 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 contain more than about 1.2% by weight of grafted monomer or 13 or more moles of graftable monomers per mole of polyolefin and have an asphaltene dispersancy test (ADT) value of at least about 8. Also described is a lubricating oil comprising such a grafted polyolefin. Also described is a method of making a grafted polyolefin dispersant viscosity index improver by adding the graft monomer or the initiator slowly during the reaction. The present reaction can optionally be carried out by providing a melted reactant composition in an extruder or other polymeric mixer.
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Consumer Reports, What's Best For Your Car--Tests of: Motor Oils Oil Filters, Batteries Filter Wrenches Tire Gauges, Motor Oils--all Brands Are Not Created Equal, Feb. 1987, pp. 88-94.
Boden Frederick J.
Goldblatt Irwin L.
McHenry Michael E.
Sauer Richard P.
Castrol Limited
McAvoy Ellen M.
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