Dispersant reaction product with antioxidant capability
AssigneeAfton Chemical Corporation
InventorJohn T. Loper
Life of this patent
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Abstract
A novel crankcase dispersant reaction product having fused therein an antioxidant moiety whereby the dispersant reaction product can function as an antioxidant while retaining at least two structural domains, one being a polar domain for association with sludge and a hydrocarbyl domain for oil solubility, so that the dispersant can function as a chemical agent to suspend sludge and prevent agglomeration of sludge precursors and soot so the latter can be readily removed from the system, such as by filtering, instead of being deleteriously deposited on internal engine components, as well as lubricant compositions incorporating such novel dispersant and, for instance, engines lubricated with such lubricant compositions.
Claims16
A dispersant reaction product having an antioxidant moiety, at least one polar structural domain, and at least one hydrocarbyl structural domain, is obtained under conditions effective to react reactants that consist essentially of a hindered phenolic antioxidant ester and a reactable dispersant, said reactable dispersant comprising a Mannich dispersant.
A dispersant reaction product having an antioxidant moiety, at least one polar structural domain, and at least one hydrocarbyl structural domain, obtained under conditions effective to react reactants that consist essentially of a hindered phenolic antioxidant ester and a reactable dispersant, said reactable dispersant comprising a succinimide-based dispersant or a Mannich-based dispersant, said hindered phenolic antioxidant ester being represented by the structure:
- wherein R is an alkoxy, R1 and R2 independently represent a linear branched alxyl group having 1 to 6 carbon atoms, and R3 represents a lower alkyl group or a hydrogen atom, the reactable dispersant consisting essentially of a succinimide-based dispersant having at least one alkyl chain, and the dispersant reaction product is represented by the structure:
Dependencies are inferred from the claim text.