Driveline fluids comprising API group II base oil
US11407959B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 28, 2016 |
| Grant date | Aug 9, 2022 |
| Priority date | — |
| Expiry date | Jul 28, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/044
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Described herein is a process, comprising: a) selecting an API Group II base stock with selected viscosity index and pour point; b) blending a base oil with the base stock, and c) adding to the base oil: i) a liquid ethylene propylene copolymer viscosity modifier that reduces a traction coefficient, and ii) an additive package, to make a driveline fluid that has a defined viscosity index and excellent shear stability. Also provided is a driveline fluid composition having the high viscosity index and excellent shear stability, comprising: a) a base oil comprising from 50 wt % to 100 wt % API Group II base stock; b) a liquid ethylene propylene copolymer viscosity modifier that reduces a traction coefficient; and c) an additive package. Further provided is a method for lubricating an axle or manual transmission by supplying the driveline fluid composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.