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US 5,399,273 AGranted
Oil soluble dispersant additives modified with bis-keto/thioketo compounds
AssigneeExxon Chemical Patents Inc.
InventorsJacob Emert, Antonio Gutierrez, Robert D. Lundberg
Life of this patent
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Abstract
The present invention is directed to an oil-soluble lubricating oil additive comprising at least one adduct of (A) a polyolefin of 700 to 5,000 number average molecular weight substituted nitrogen- or ester-containing ashless dispersant and (B) a bis-keto/thioketo compound.
Claims16
An adduct useful as a disperant additive to oleaginous compositions, comprising the reaction product of
- (A) at least one ashless dispersant comprising a Mannich condensation product formed by condensing about a molar proportion of long chain hydrocarbon-substituted phenol with about 1 to 2.5 moles of formaldehyde and about 0.5 to 2 moles of polyamine;
- and
- (B) at least one bis-(keto/thioketo ester/thioester) compound.
An adduct useful as a dispersant additive to oleaginious compositions and prepared by:
- (1) preparing a coupled adduct formed by reaction of at least one polyamine and at least one bis-(keto/thioketo ester/thioester) compound linking reactant;
- and
- (2) reacting said coupled adduct with at least one Mannich Base condensation reaction mixture comprising a molar proportion of long chain hydrocarbyl polymer-substituted phenol and about 1 to 2.5 moles of formaldehyde per about 0.5 to 2 moles of the polyamine content of said coupled adduct.
Dependencies are inferred from the claim text.