Water-based hydraulic fluid
US4138346A · kind A · utility
35Cited by
2References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1976 |
| Grant date | Feb 6, 1979 |
| Priority date | — |
| Expiry date | Dec 6, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2050/01
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to the use, as hydraulic fluids or metalworking lubricants, of compositions having water as a base and improved extreme pressure lubricating and wear-preventing characteristics. The hydraulic fluids of the invention are nonflammable and comprise a synergistic combination of a phosphate ester and a sulfur-containing compound. The compositions can be thickened, if desired, using a polyglycol type thickener and can contain additives known to the art such as defoamers and corrosion inhibitors. Stable concentrates comprising the phosphate ester and sulfur-containing compound can be prepared.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.