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US 7,981,848 B2Granted
Use of polyalkylmethacrylate polymer
AssigneeEvonik Rohmax Additives GmbH
InventorsDouglas G. Placek, Christian D. Neveu, Roland Schweder, Robert P. Simko, Charles W. Hyndman
Life of this patent
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Abstract
The present invention relates to the use of a polyalkylmethacrylate polymer to improve the air release of a functional fluid.
Claims24
A method of improving pump efficiency of a hydraulic pump, comprising:
- operating said hydraulic pump with a hydraulic fluid comprising at least one base oil and a polyalkylmethacrylate polymer;
- wherein the pump efficiency is improved compared to the pump efficiency when using a hydraulic fluid which does not comprise said polyalkylmethacrylate polymer;
- wherein an ISO viscosity grade of said hydraulic fluid is maintained compared to a hydraulic fluid which does not comprise said polyalkylmethacrylate polymer;
- and
- wherein said hydraulic fluid comprises 1-30% by weight of said polyalkylmethacrylate polymer.
2 more elements
A method of reducing energy consumption of a hydraulic pump, comprising:
- operating said hydraulic pump with a hydraulic fluid comprising at least one base oil and a polyalkylmethacrylate polymer;
- wherein the energy consumption is reduced compared to the energy consumption when using a hydraulic fluid which does not comprise said polyalkylmethacrylate polymer;
- wherein an ISO viscosity grade of said hydraulic fluid is maintained compared to a hydraulic fluid which does not comprise said polyalkylmethacrylate polymer;
- and
- wherein said hydraulic fluid comprises 1-30% by weight of said polyalkylmethacrylate polymer.
2 more elements
A method of decreasing friction and wear of moving parts, comprising:
- contacting said moving parts with a lubricant comprising at least one base oil and a polyalkylmethacrylate polymer;
- wherein the friction and wear are reduced compared to the friction and wear when using a lubricant which does not comprise said polyalkylmethacrylate polymer;
- wherein an ISO viscosity grade of said hydraulic fluid is maintained compared to a hydraulic fluid which does not comprise said polyalkylmethacrylate polymer;
- and
- wherein said hydraulic fluid comprises 1-30% by weight of said polyalkylmethacrylate polymer.
2 more elements
A method of reducing erosion in a hydraulic system, comprising:
- mixing at least one base oil with a polyalkylmethacrylate polymer, to obtain a hydraulic fluid;
- contacting the hydraulic system with said hydraulic fluid to improve the air release of said hydraulic fluid and reduce the erosion in said hydraulic system;
- wherein an ISO viscosity grade of said hydraulic fluid is maintained compared to a hydraulic fluid which does not comprise said polyalkylmethacrylate polymer;
- and
- wherein said hydraulic fluid comprises 1-30% by weight of said polyalkylmethacrylate polymer.
2 more elements
A method of preventing degradation of a hydraulic fluid in a hydraulic system, comprising:
- mixing at least one base oil with a polyalkylmethacrylate polymer, to obtain a hydraulic fluid;
- contacting the hydraulic system with said hydraulic fluid to improve the air release of said hydraulic fluid and prevent degradation of said hydraulic fluid in said hydraulic system;
- wherein an ISO viscosity grade of said hydraulic fluid is maintained compared to a hydraulic fluid which does not comprise said polyalkylmethacrylate polymer;
- and
- wherein said hydraulic fluid comprises 1-30% by weight of said polyalkylmethacrylate polymer.
2 more elements
A reservoir of a hydraulic system, comprising:
- a hydraulic fluid comprising at least one base oil and a polyalkylmethacrylate polymer,
- wherein said reservoir is smaller than a reservoir comprising the same hydraulic fluid except without said polyalkylmethacrylate polymer;
- wherein an ISO viscosity grade of said hydraulic fluid is maintained compared to a hydraulic fluid which does not comprise said polyalkylmethacrylate polymer;
- and
- wherein said hydraulic fluid comprises 1-30% by weight of said polyalkylmethacrylate polymer.
2 more elements
Dependencies are inferred from the claim text.