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US 2014/0274831 A1Published application
Gear lubricant comprising carbon black
AssigneeChevron U.S.A. Inc.
InventorEtho Satish Lalla
Life of this patent
Estimating the term…
Abstract
A gear oil composition is provided. The composition comprises a major amount of base oil comprising a mixture of a mineral base oil and polybutene; and 0.1 to 0.5 wt % of carbon black, based on the total weight of the gear oil composition. Such compositions can provide improved viscosity stability.
Claims16
A gear oil composition, comprising:
- a. a major amount of a mineral oil having an oil kinematic viscosity at 100° C. from 3 to 120 mm2/s and a viscosity index of at least 60, wherein the mineral oil comprises less than 5 wt % of a heavy fraction;
- b. a polybutene in an amount from greater than 10 wt % to 25 wt %, based on a total weight of the gear oil composition;
- c. 0.1 to 0.5 wt % of carbon black, based on the total weight of the gear oil composition, wherein the carbon black consists of unit particles of amorphous carbon with the unit particles linking together into chains;
- d. 0.001 to 30 wt % of at least one additive selected from dispersants, detergents, antifoaming agents, antioxidants, rust inhibitors, metal passivators, extreme pressure agents, friction modifiers, and mixtures thereof, based on the total weight of the gear oil composition.
1 more element
A method for improving viscosity stability of a gear oil composition, comprising adding 0.1 to 0.5 wt % of a carbon black, based on a total weight of the gear oil composition, to a major amount of a mixture of a mineral base oil and a polybutene;
- wherein the mineral base oil has an oil kinematic viscosity at 100° C. from 3 to 120 mm2/s and a viscosity index of at least 60, and wherein the mineral base oil comprises less than 5 wt % of a heavy fraction;
- wherein the polybutene has a number average molecular weight of from 400 to 10,000;
- and
- wherein the carbon black consists of unit particles of amorphous carbon with the unit particles linking together into chains.
1 more element
Dependencies are inferred from the claim text.