Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Heterocyclic ring compound; a heterocyclic ring is one...
Patent
1996-12-09
1999-10-12
McAvoy, Ellen M.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Heterocyclic ring compound; a heterocyclic ring is one...
508293, 508542, 508558, C10M14902
Patent
active
059654970
ABSTRACT:
This invention relates to shear stable multigrade oils for crankcase lubrication of gasoline and diesel engines which oils are substantially free of viscosity modifier additives and comprise a detergent inhibitor package of lubricating oil additives, which package includes an ashless dispersant comprising an oil soluble polymeric hydrocarbon backbone having functional groups in which the hydrocarbon backbone is derived from an ethylene alpha-olefin (EAO) copolymer or alpha-olefin homo- or copolymer an M.sub.n of from 500 to 7000. Such multigrade crankcase oils without viscosity modifiers are more economical and may provide better diesel performance and seal comparability. The oils are also substantially shear stable and may be used in turbocharged engines and racing engines, with reduced mechanical breakdown of the oil.
REFERENCES:
patent: 4234435 (1980-11-01), Meinhardt et al.
patent: 5128056 (1992-07-01), Guiterrez et al.
patent: 5175225 (1992-12-01), Ruhe, Jr.
patent: 5200103 (1993-04-01), Song et al.
patent: 5266223 (1993-11-01), Song et al.
Adams David Robert
Brice Paul
Exxon Chemical Patents Inc.
McAvoy Ellen M.
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