# US 11,111,455 B2 · Lubricating oil composition for automatic transmissions

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- Number: US 11,111,455 B2
- Document ID: US11111455B2
- Status: Granted
- Kind: B2
- Application number: 16/331,212
- Filed: 2017-09-07
- Published: 2019-09-12
- Granted: 2021-09-07
- Earliest claimed: 2016-09-09
- Assignees: Shell Oil Company
- Applicants: Shell Oil Company
- Inventors: Ryuji Maruyama; Genki Kamei
- Web page: https://patentgrep.com/patent/US11111455B2

## CPC

- C10M 169/041: {the additives being macromolecular compounds only}
- C10M 101/00: Lubricating compositions characterised by the base-material being a mineral or fatty oil (containing more than 10% water C10M173/00)
- C10M 105/04: aliphatic
- C10M 107/02: Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation
- C10M 111/04: at least one of them being a macromolecular organic compound
- C10M 145/14: Acrylate; Methacrylate
- C10M 171/02: Specified values of viscosity or viscosity index
- C10M 2203/003: used as base material
- C10M 2203/1006: used as base material
- C10M 2203/1025: used as base material
- C10M 2205/0206: used as base material
- C10M 2205/0225: used as base material
- C10M 2205/028: containing aliphatic monomers having more than four carbon atoms
- C10M 2205/0285: used as base material
- C10M 2205/173: used as base material
- C10M 2209/084: Acrylate; Methacrylate
- C10N 2020/02: Viscosity; Viscosity index
- C10N 2020/04: Molecular weight; Molecular weight distribution
- C10N 2030/02: Pour-point; Viscosity index
- C10N 2030/08: Resistance to extreme temperature
- C10N 2030/68: {Shear stability}
- C10N 2030/74: {Noack Volatility}
- C10N 2040/04: Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
- C10N 2040/042: {for automatic transmissions}
- C10N 2040/044: {for manual transmissions}
- C10N 2040/045: {for continuous variable transmission [CVT]}
- C10N 2040/08: Hydraulic fluids, e.g. brake-fluids
- C10N 2040/30: Refrigerators lubricants {or compressors lubricants}
- C10N 2070/00: Specific manufacturing methods for lubricant compositions
- C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33)
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS

## Abstract

The invention provides a lubricating oil composition for automatic transmissions is made such that it comprises proportionately as its main constituents: 60 to 98 mass % as low viscosity base oils being base oils belonging to Groups 2 to 4 of the API (American Petroleum Institute) base oil categories wherein the kinematic viscosity at 100° C. is 2 to 5 mm2/s (Fischer-Tropsch synthetic oil comprising at least 45 to 80 mass %); 1 to 20 mass % as high-viscosity base oils being metallocene/poly-α-olefins with a kinematic viscosity at 100° C. of 100 to 600 mm2/s; and 1 to 20 mass % being a polymethacrylate with a weight-average molecular weight of 10,000 to 50,000. The viscosity index of this composition is not less than 190, the Brookfield viscosity at −40° C. is not more than 5000 mPa·s, the 100° C. kinematic viscosity is 5 to 7 mm2/s, and the rate of reduction of the 100° C. kinematic viscosity after a KRL shear stability test (60° C., 20 hr) is not more than 3%.

## Claims

### Claim 1

A lubricating oil composition for automatic transmissions, the lubricating oil composition comprising:
a low viscosity base oil at a concentration of 60% to 98% by mass,
wherein the low viscosity base oil comprises one or more of a Group 2 base oil, a Group 3 base oil, and a Group 4 base oil, with each of the Group 2 base oil, the Group 3 base oil, and the Group 4 base oil being categories defined by the American Petroleum Institute,
wherein the low viscosity base oil has a kinematic viscosity of 2 mm2/s to 5 mm2/s at 100° C., and
wherein at least 45% by mass of the low viscosity base oil comprises at least one Fischer-Tropsch synthetic oil;
a high viscosity base oil at concentration of 1% to 20% by mass,
wherein the high viscosity base oil comprises a metallocene/poly-α-olefin, and
wherein the high viscosity base oil has a kinematic viscosity of a 100 mm2/s to 600 mm2/s at 100° C.; and
a polymethacrylate at a concentration of 1% to 20% by mass, wherein the polymethacrylate has a molecular weight of 10,000 to 50,000 by weight-average,
wherein the lubricating oil has:
a kinematic viscosity of 5 mm2/s to 7 mm2/s at 100° C.;
a viscosity index of at least 190;
a low temperature (−40° C.) Brookfield viscosity of not more than 5000 mPa·s;
a rate of reduction of not more than 3% as measured by a KRL shear stability test of a 100° C. kinematic viscosity; and
an evaporation loss of not more than 10% by mass as measured by the NOACK method for 200° C./hour.

### Claim 2 (depends on 1)

The lubricating oil of claim 1, wherein the low viscosity base oil further comprises 45% to 80% by mass of at least one Fischer-Tropsch synthetic oil.

### Claim 3 (depends on 1)

The lubricating oil of claim 1, wherein the low viscosity base oil further comprises at least one of a mineral oil and a poly-α-olefin.

### Claim 4 (depends on 1)

The lubricating oil of claim 1, wherein the metallocene/poly-α-olefin of the high viscosity base oil has a kinematic viscosity of a 300 mm2/s to 500 mm2/s at 100° C.

### Claim 5 (depends on 1)

The lubricating oil of claim 1, wherein the polymethacrylate has a molecular weight of 15,000 to 30,000 by weight-average.

### Claim 6 (depends on 1)

The lubricating oil of claim 1, wherein the low viscosity base oil further comprises 100% by mass of at least one Fischer-Tropsch synthetic oil.