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US 7,833,955 B2Granted
Viscosity modifiers in controlled release lubricant additive gels
AssigneeThe Lubrizol Corporation
InventorsJames D. Burrington, Barbara P. Leffel
Life of this patent
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Abstract
The present invention relates to the use of viscosity modifiers in a control release additive gel. Furthermore, the present invention relates to an additive gel containing a viscosity modifier that control releases additives into a lubricant.
Claims14
A control release composition comprising:
- an additive gel wherein the gel consists of:
- 1) an overbased detergent having a total base number (TBN)≧13 or mixtures thereof;
- wherein the gel is free of ashless dispersants;
- 2) an acid component selected from the group consisting of acid formed from a polymer containing acidic groups in the backbone, a polyacidic compound, maleic anhydride styrene copolymers, or mixtures thereof;
- 3) a viscosity modifier;
- and
- 4) optionally one or more other lubricant additives selected from the group consisting of the viscosity modifier(s), friction modifier(s), ashless detergent(s), cloud point depressant(s), pour point depressant(s), demulsifier(s), flow improver(s), anti-static agent(s), ashless antioxidant(s), antifoam(s), corrosion/rust inhibitor(s), extreme pressure/antiwear agent(s), seal swell agent(s), lubricity aid(s), antimisting agent(s), a low viscosity material, a gel-breaking surfactant or mixtures thereof.
4 more elements
A process comprising:
- 1) contacting a control release composition, comprising a gel, with a lubricant in a device, wherein the gel consists of;
- a) an overbased detergent, having a total base number (TBN)≧13 or mixtures thereof;
- b) an acid component selected from the group consisting of acid formed from a polymer containing acidic groups in the backbone, a polyacidic compound, maleic anhydride styrene copolymers, or mixtures thereof;
- c) a viscosity modifier;
- and
- d) optionally one or more other lubricant additives selected from the group consisting of the viscosity modifier(s), friction modifier(s), ashless detergent(s), cloud point depressant(s), pour point depressant(s), demulsifier(s), flow improver(s), anti-static agent(s), ashless antioxidant(s), antifoam(s), corrosion/rust inhibitor(s), extreme pressure/antiwear agent(s), seal swell agent(s), lubricity aid(s), antimisting agent(s), a low viscosity material, a gel-breaking surfactant or mixtures thereof wherein the gel is free of ashless dispersants;
- 2) dissolving the control release gel over time.
4 more elements
Dependencies are inferred from the claim text.