Combination of phosphate based additives and sulfonate salts for hydraulic fluids and lubricating compositions
US6046144A · kind A · utility
12Cited by
21References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1997 |
| Grant date | Apr 4, 2000 |
| Priority date | — |
| Expiry date | Jun 2, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/08
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed are synergistic antioxidant compositions composed of (1) amine salts of alkyl phosphates and (2) ethylenediamine, ammonium or metal salts of alkylarylsulfonates. The antioxidant compositions are useful for formulating zinc-free antiwear hydraulic fluids and gear lubricating oils in conjunction with thiophosphate type antiwear agents, corrosion and rust inhibitors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.