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US 6,916,766 B2Granted
Circulating oil compositions
AssigneeExxonMobil Research and Engineering Company
InventorsKevin Buzdygon, Angela Stefana Galiano-Roth
Life of this patent
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Abstract
A combination of an ashless dispersant comprising the reaction product of a succinic anhydride and a polyamine and an ashless rust inhibitor comprising a mixture of a succinic anhydride and a oxime substituted aromatic compound in a lubricant base stock along with a poly alkylene alcohol demulsifier provides a circulating oil composition having good demulsibility, deposit control and rust inhibition.
Claims12
A lubricant composition comprising:
- (a) a lubricating oil basestock;
- (b) an effective amount of an ashless dispersant selected from the group consisting of the reaction product of a polyalkenyl succinic anhydride and a polyamine, and said reaction product post cured with cyclic carbonate, boric acid or boric acid derivative;
- (c) an effective amount of an ashless rust inhibitor comprising a mixture of an alkyl succinic anhydride and an aromatic oxime;
- and
- (d) an effective amount of a polyoxyalkylene alcohol demulsifier.
2 more elements
A lubricant composition comprising:
- (a) a lubricating oil basestock;
- (b) from about 0.1 to about 5.0 wt % of an ashless dispersant selected from the group consisting of the reaction product of a polyalkenyl succinic anhydride and a polyamine, and said reaction post cured with cyclic carbonate, boric acid or boric acid derivative;
- c) from about 0.4 to about 3.0 wt % of an ashless rust inhibitor comprising a mixture of an alkylsuccinic anhydride and an aromatic oxime in the molar ratio of about 1:1 to about 10:1;
- and
- (d) about 0.001 to about 0.1 wt % of a polyoxyalkylene alcohol demulsifier, the wt % of each component being based on the total weight of the composition.
2 more elements
A circulating oil composition comprising:
- (a) a basestock selected from API Group I basestocks and mixtures thereof;
- (b) an effective amount of an ashless dispersant consisting essentially of the boric acid post cured reaction product of polyisobutylene succinic anhydride and tetraethylene pentamine;
- (c) an effective amount of an ashless rust inhibitor comprising a mixture of an alkyl succinic anhydride wherein the alkyl group is a branched alkyl group of form 12 to 14 carbon atoms and an aromatic oxime represented by the formula
- where R1 is H or
- and R2 is an alkyl group of 5 to 15 carbon atoms;
- and
- (d) an effective amount of a polyoxyalkene alcohol having the formula
- where EO is an ethylene oxide moiety, PO is a propylene oxide moiety, x and y represent the relative amounts of each moiety.
5 more elements
Dependencies are inferred from the claim text.