Dispersant viscosity modifiers with sulfonate functionality
AssigneeThe Lubrizol Corporation
InventorsAdam Preston, Yanshi Zhang, Sona S. Slocum, Matthew D. Gieselman
Life of this patent
Estimating the term…
Abstract
A lubricating composition includes an oil of lubricating viscosity and an oil-soluble dispersant viscosity modifier, which includes an olefin-based polymer backbone and at least one pendent functional group. Each of the at least one pendent functional group is independently attached to the olefin-based polymer backbone by a linking group. The at least one pendent functional group includes a sulfonate moiety.
Claims34
A lubricating composition comprising:
- an oil of lubricating viscosity;
- and
- at least 0.05 wt. % of an oil-soluble dispersant viscosity modifier comprising an olefin-based polymer backbone and at least one pendent functional group selected from alkyl and aryl sulfonate salts, alkyl and aryl sulfonic acids, and combinations thereof, the olefin-based polymer backbone comprising an ethylene-olefin-based copolymer, each of the at least one pendent functional group being independently attached to the olefin-based polymer backbone by a linking group, the at least one pendent functional group comprising a sulfonate moiety, wherein the at least one pendent functional group is derived from a sulfonated hydrocarbyl compound selected from the group consisting of:
- where c is from 1-10,
- d is from 1-10,
- e is at least 1,
- B is NH2 or OH,
- R11, R12, R13 and R14 are independently H or a C1 to C30 alkyl group, and
- R15, R16, R17, and R18 are independently selected from H, OH, NH2, alkyl groups, and alkoxy groups.
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
A process for making a lubricating composition comprising:
- (i) providing an olefin-based polymer backbone with one or more acylating linking groups, each independently attached along the polymer backbone;
- (ii) optionally, reacting each acylating group with a hydroxy alkyl amine, an alkylene polyamine, a polyol, or a combination thereof, resulting in an olefin-based polymer with one or more linker units each independently attached along the polymer backbone;
- and
- (iii) reacting each linking group or linker unit with a hydrocarbyl sulfonate compound selected from sulfonate salts and sulfonic acids, resulting in a dispersant viscosity modifier comprising one or more pendent hydrocarbyl sulfonate groups each independently attached to the olefin-based polymer.
Dependencies are inferred from the claim text.