Aqueous compositions containing thiophosphorus esters or their salts with a oxyalkylene group, and methods of using the same
US6617288B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 1998 |
| Grant date | Sep 9, 2003 |
| Priority date | — |
| Expiry date | May 8, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2050/01
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
This invention relates to an aqueous composition comprising water, a surfactant or thickener, and at least one metal-free thiophosphorus acid ester, at least one amine salt of the thiophosphorus acid ester, or a mixture thereof, wherein the thiophosphorus acid ester contains at least one hydrocarbyl terminated oxyalkylene group, at least one hydrocarbyl terminated polyoxyalkylene group, or a mixture thereof. The aqueous compositions have improved antiwear/extreme pressure properties and improved antioxidation properties. In these compositions, the thiophosphorus acid esters and their salts act as antiwear agents and rust inhibitors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.