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US 2010/0144569 A1Published application
Use of polyalkylmethacrylate polymer
AssigneeRohmax 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.
Claims26
1-19. (canceled)
20:
- 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.
21:
- 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 polyalkyl methacrylate polymer;
- wherein the energy consumption is reduced compared to the energy consumption when using a hydraulic fluid which does not comprise said polyalkylmethacrylate polymer.
22:
- 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.
23:
- 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.
24:
- 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.
25:
- A reservoir of a hydraulic system, comprising:
- a hydraulic fluid comprising at least one base oil and a polyalkylmetacrylate polymer,
- wherein said reservoir is smaller than a reservoir comprising the same hydraulic fluid except without said polyalkylmethacrylate polymer.
26:
- The method according to claim 20, 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.
27:
- The method according to claim 26, wherein said ISO viscosity grade is in the range of 15 to 3200.
28:
- The method according to claim 20, wherein said polyalkylmethacrylate polymer comprises at least 40% by weight methacrylate repeating units.
29:
- The method according to claim 20, wherein said hydraulic fluid has a viscosity index according to ASTM D 2270 of at least 120.
30:
- The method according to claim 20, wherein said polyalkylmethacrylate polymer has a molecular weight in the range of 10000-200000 g/mol.
31:
- The method according to claim 20, wherein said polyalkylmethacrylate polymer comprises C9-C24 methacrylate repeating units and C1-C8 methacrylate repeating units.
32:
- The method according to claim 20, wherein said polyalkylmethacrylate polymer comprises repeating units derived from dispersant monomers.
33:
- The method according to claim 20, wherein said polyalkylmethacrylate polymer comprises repeating units derived from styrene.
34:
- The method according to claim 20, wherein said polyalkylmethacrylate polymer comprises repeating units derived from ethoxylated and/or hydroxylated methacrylate monomers.
35:
- The method according to claim 20, wherein said hydraulic fluid comprises antioxidants, corrosion inhibitors, defoamers or mixtures thereof.
36:
- The method according to claim 20, wherein said hydraulic fluid comprises a mineral oil.
37:
- The method according to claim 20, wherein said hydraulic fluid comprises at least one synthetic oil.
38:
- The method according to claim 37, wherein said synthetic oil comprises a poly-alpha olefin, a carboxylic ester, a carboxylic diester, a polyol ester, a phosphate ester, a trialkyl phosphate ester, triaryl phosphate ester, alkyl aryl phosphate ester, a polyalkylene glycol or mixtures thereof.
39:
- The method according to claim 20, wherein said polyalkylmethacrylate polymer is obtained by polymerizing a mixture of olefinically unsaturated monomers, said mixture comprising:
- a) 0-100 wt %, based on a total weight of the ethylenically unsaturated monomers, of one or more ethylenically unsaturated ester compounds of formula (I)
- wherein
- R is hydrogen or methyl,
- R1 means a linear or branched alkyl residue with 1-8 carbon atoms,
- R2 and R3 independently represent hydrogen or a group of the formula —COOR′, wherein R′ means hydrogen or a alkyl group with 1-8 carbon atoms,
- b) 0-100 wt %, based on the total weight of the ethylenically unsaturated monomers, of one or more ethylenically unsaturated ester compounds of formula (II)
- wherein
- R is hydrogen or methyl,
- R4 means a linear or branched alkyl residue with 9-16 carbon atoms,
- R5 and R6 independently are hydrogen or a group of the formula —COOR″, wherein R″ means hydrogen or an alkyl group with 9-16 carbon atoms,
- c) 0-80 wt %, based on the total weight of the ethylenically unsaturated monomers, of one or more ethylenically unsaturated ester compounds of formula (III)
- wherein
- R is hydrogen or methyl,
- R7 means a linear ox branched alkyl residue with 17-40 carbon atoms,
- R8 and R9 independently are hydrogen or a group of the formula —COOR′″, wherein R′″ means hydrogen or an alkyl group with 17-40 carbon atoms,
- d) 0-50 wt %, based on the total weight of the ethylenically unsaturated monomers, of comonomers,
- wherein at least 50 wt %, based on the total weight of the ethylenically unsaturated monomers, are methacrylates.
15 more elements
40:
- The method according to claim 39, wherein said mixture of olefinically unsaturated monomers comprises 50 to 95% by weight of the component b).
41:
- The method according to claim 39, wherein said mixture of olefinically unsaturated monomers comprises 1 to 30% by weight of the component a).
42:
- The method according to claim 20, wherein said polyalkylmethacrylate polymer has a molecular weight in the range of 25000 g/mol-100000 g/mol.
43:
- The method according to claim 20, wherein said hydraulic fluid comprises a mineral oil from API Group I, II, or III.
44:
- The method according to claim 20, wherein said hydraulic fluid comprises at least one synthetic oil from API Group IV and V.