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US 9,175,242 B2Granted
Fluid having improved lubricity properties
AssigneeEvonik Rohmax Additives GmbH
InventorsChristopher Paul Radano, Peter Moore, Mandi J. McElwain, Michael L. Alessi, Boris Eisenberg, Christoph Wincierz
Life of this patent
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Abstract
A lubricant which contains an ester oil and a polyalkyl(meth)acrylate copolymer having in copolymerized form a C1-C4 alkyl(meth)acrylate, and a C4-C4000 alkyl(meth)acrylate exhibits an improved Viscosity Index compared to a lubricant having no ester oil.
Claims11
A lubricant, comprising:
- 5.0 wt. % of an ester oil;
- a hydrocarbon oil selected from the group consisting of a mineral oil of Group I, II and III;
- and
- 12.78 to 14.2 wt % of a polyalkyl(meth)acrylate copolymer having a weight average molecular weight of from 25,000 to 160,000,
- the copolymer comprising, in copolymerized form,
- a) 13 to 25 wt % based on a total weight of the polyalkyl(meth)acrylate copolymer of units of one or more alkyl(meth)acrylate monomers of formula (I):
- wherein
- R is hydrogen or methyl, and
- R1 is a linear, branched or cyclic alkyl residue with 1 to 4 carbon atoms;
- b) 36 to 87 wt % based on a total weight of the polyalkyl(meth)acrylate copolymer of units of one or more alkyl(meth)acrylate monomers of formula (II):
- wherein
- R is hydrogen or methyl, and
- R2 is a linear, branched or cyclic alkyl residue with 5 to 15 carbon atoms;
- and
- c) 0 to 39 wt % based on a total weight of the polyalkyl(meth)acrylate copolymer of units of one or more alkyl(meth)acrylate monomers of formula (III):
- wherein
- R is hydrogen or methyl,
- R3 is a linear, branched or cyclic alkyl residue with 16 to 400 carbon atoms;
- and
- d) units of comonomers.
17 more elements
A method for preparing a lubricant, the method comprising:
- polymerizing a monomer mixture in the presence of at least one of an ester oil and a hydrocarbon oil;
- the monomer mixture comprising,
- a) 13 to 25 wt % of one or more alkyl(meth)acrylate monomers of formula (I):
- wherein
- R is hydrogen or methyl, and
- R1 is a linear, branched or cyclic alkyl residue with 1 to 4 carbon atoms;
- b) 36 to 87 wt % of one or more alkyl(meth)acrylate monomers of formula (II):
- wherein
- R is hydrogen or methyl, and
- R2 is a linear, branched or cyclic alkyl residue with 5 to 15 carbon atoms;
- and
- c) 0 to 39 wt % of one or more alkyl(meth)acrylate monomers of formula (III):
- wherein
- R is hydrogen or methyl,
- R3 is a linear, branched or cyclic alkyl residue with 16 to 400 carbon atoms;
- and
- d) units of comonomers;
- wherein
- a weight average molecular weight of the polyalkyl(meth)acrylate copolymer is from 25,000 to 160,000, and
- the hydrocarbon oil is selected from the group consisting of a mineral oil of Group I, II and III.
17 more elements
Dependencies are inferred from the claim text.