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US 11,560,527 B2Granted
Lubricating oil composition for transmission
AssigneeEneos Corporation
InventorsKohei Masuda, Haruko Nagai, Masaaki Itou, Mayuko Sumiya
Life of this patent
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Abstract
A lubricating oil composition for a transmission, the composition including: (A) a lubricant base oil comprising a mineral base oil and/or a synthetic base oil; and (B) a poly(meth)acrylate having a weight average molecular weight of no more than 25,000, wherein the composition has a kinematic viscosity at 100° C. of 2.5 to 4.9 mm2/s.
Claims17
A lubricating oil composition for a transmission, the composition comprising:
- (A) a lubricant base oil comprising a mineral base oil and/or a synthetic base oil;
- and
- (B) at least one polyalkyl (meth)acrylate (B2) each having a weight average molecular weight of no more than 15,000, wherein each of the polyalkyl (meth)acrylate (B2) has a monomer composition consisting of:
- at least one alkyl (meth)acrylate monomer unit (B2a) in an amount of no less than 75 mol % on the basis of the total monomer units of the polylalkyl (meth)acrylate (B2), wherein the monomer unit (B2a) is represented by the general formula (1) wherein R1 is a hydrogen atom or a methyl group, and R2 is a C8-18 linear or branched chain alkyl group;
- optionally at least one alkyl (meth)acrylate monomer unit (B2d) represented by the general formula (1) wherein R1 is a hydrogen atom or a methyl group, and R2 is a C1-3 linear or branched chain alkyl group;
- optionally at least one alkyl (meth)acrylate monomer unit (B2e) represented by the general formula (1) wherein R1 is a hydrogen atom or a methyl group, and R2 is a C4-7 linear or branched chain alkyl group;
- optionally at least one alkyl (meth)acrylate monomer unit (B2g) represented by the general formula (1) wherein R1 is a hydrogen atom or a methyl group, and R2 is a C19-36 linear or branched chain alkyl group;
- optionally at least one alkyl (meth)acrylate monomer unit (B2f) represented by the general formula (1) wherein R1 is a hydrogen atom or a methyl group, and R2 is a linear or branched chain alkyl group having at least 37 carbons;
- and
- optionally at least one monomer unit (B2h) other than any (meth)acrylate monomer unit,
- wherein the composition has a kinematic viscosity at 100° C. of 2.5 to 4.9 mm2/s.
8 more elements
A lubricating oil composition for a transmission, the composition comprising:
- (A) a lubricant base oil comprising a mineral base oil and/or a synthetic base oil, and having a kinematic viscosity at 100° C. of 2.0 to 2.2 mm2/s;
- and
- (B) at least one polyalkyl (meth)acrylate (B2) each having a weight average molecular weight of no more than 15,000,
- each of the polyalkyl (meth)acrylate (B2) comprising at least one alkyl (meth)acrylate monomer unit (B2a) in an amount of no less than 75 mol % on the basis of the total monomer units of the polylalkyl (meth)acrylate (B2), wherein the monomer unit (B2a) is represented by the general formula (1) wherein R1 is a hydrogen atom or a methyl group, and R2 is a C8-18 linear or branched chain alkyl group,
- wherein the composition has a kinematic viscosity at 100° C. of 2.5 to 4.9 mm2/s.
2 more elements
Dependencies are inferred from the claim text.