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US 7,888,299 B2Granted
Extended drain, thermally stable, gear oil formulations
AssigneeAfton Chemical Japan Corp.
InventorsJeffrey L. Milner, Masao Seki, Roger M. Sheets, Kenji Yatsunami
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Abstract
In its broadest concept, the present invention relates to an improved gear oil comprising: a) a base oil having a viscosity range of 4 to 32 cSt at 100° C.; b) a maximum level of hydrocarbyl polysulfide with a minimum level of active S species; c) a dihydrocarbyl dithiophosphate ester or salt; and d) a dihydrocarbyl (mono)thiophosphate amine salt, essentially free of phosphite.
Claims10
A gear oil composition comprising the following components:
- Component A:
- a base oil having a kinematic viscosity at 100° C. of about 4 to about 32 cSt;
- Component B:
- a di-t-butyl tri-sulfide, di-t-butyl tetra-sulfide, and di-t-butyl penta-sulfide mixture having a sulfur activity of greater than about 125 mg in the Copper Corrosion Test;
- Component C:
- a dihydrocarbyl dithiophosphate ester or salt;
- and
- Component D:
- a dihydrocarbyl (mono)thiophosphate amine salt.
6 more elements
A gear oil composition comprising the following components:
- Component A:
- a base oil having a kinematic viscosity at 100° C. of about 4 to about 32 cSt;
- Component B:
- a di-t-butyl tri-sulfide, di-t-butyl tetra-sulfide, and di-t-butyl penta-sulfide mixture having a sulfur activity of greater than about 125 mg in the Copper Corrosion Test;
- Component C:
- the product of the mixture of dicyclopentadiene and dialkyldithiophosphoric acid, wherein the weight percentage of Component C is about 0.1 to about 6.0 percent of the oil;
- and
- Component D:
- a dihydrocarbyl (mono)thiophosphate amine salt.
6 more elements
Dependencies are inferred from the claim text.