Novel ethylene alpha-olefin copolymer substituted Mannich base lubricant dispersant additives
AssigneeExxon Chemical Patents Inc.
InventorsAntonio Gutierrez, Won R. Song, Robert D. Lundberg, Robert A. Kleist
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Abstract
The present invention is directed to oil-soluble lubricating oil additives comprising Mannich Base condensates of an alkyl substituted hydroxy aromatic compound with formaldehyde and an amine, wherein the alkyl-moiety of the aromatic compounds is derived from at least one ethylene alpha-olefin copolymer of 300 to 10,000 number average molecular weight, wherein at least about 30% of the polymer's chains contain terminal ethenylidene unsaturation. The Mannich Base condensates of this invention are useful as dispersants.
Claims25
A lubricating oil dispersant additive useful in oleaginous compositions which comprises a condensation product obtained by the reaction of:
- (a) at least one alkyl-substituted hydroxyaromatic compound formed by the alkylation of at least one hydroxy aromatic compound with at least one terminally unsaturated ethylene alpha-olefin polymer of 300 to 10,000 number average molecular weight, at least 30% of said polymer's chains contain terminal ethenylidene unsaturation;
- (b) at least one aldehyde reactant;
- and
- (c) at least one nucleophilic reactant, said dispersant additive having a VR' value of less than 4.1.
The dispersant additive of claim wherein said copolymer has a number average molecular weight of from about 700 to about 5,000.
A process for producing a low sediment lubricating oil dispersant material which comprises contacting (A) at least one alkyl-substituted hydroxyaromatic compound formed by the alkylation of at least one hydroxy aromatic compound with at least one ethylene alpha-olefin polymer of 300 to 10,000 number average molecular weight, wherein at least 30% of said polymer's chains contain terminal ethenylidene unsaturation, (B) at least one aldehyde reactant;
- and (C) at least one nucleophilic reactant, under condensation conditions to form said dispersant material characterized by a VR, value of less than 4.1.
Dependencies are inferred from the claim text.