Multifunctional viscosity index improver-dispersant antioxidant

Details Multifunctional viscosity index improver-dispersant antioxidant Multifunctional viscosity index improver-dispersant antioxidant

1993-12-30

1995-08-08

Willis, Jr., Prince

Compositions

Electrolytes for electrical devices

252 515A, 525132, 5253276, 525379, 525381, 525382, C10N14500

Patent

active

054396077

ABSTRACT:
Oleaginous compositions, particularly lubricating oil compositions, exhibiting improved antioxidant properties containing a viscosity index improving amount of a viscosity index improver-dispersant comprised of the reaction products of: (a) an oil soluble ethylene copolymer comprising from about 15 to 90 wt. % ethylene and from about 10 to 85 wt. % of at least one C.sub.3 to C.sub.28 alpha-olefin, having a number average molecular weight of from about 20,000 to 500,000, grafted with an ethylenically unsaturated carboxylic acid material having 1 or 2 acid or anhydride moieties; (b) an organic polyamine having at least two primary amino groups; (c) an aldehyde; (d) a hydroxy aromatic reactant having at least one --OH-- group attached to the aromatic ring; and, optionally, (e) an amount effective to provide a V.I. improver-dispersant exhibiting improved low temperature viscometric properties of high functionality long chain hydrocarbyl substituted dicarboxylic acid material having a functionality of at least 1.3.

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