Natural and synthetic ester-containing lubricants having enhanced hydrolytic stability
US9556394B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2012 |
| Grant date | Jan 31, 2017 |
| Priority date | — |
| Expiry date | Jun 8, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/08
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A lubricant composition comprising (a) from 0.1 to 10 percent by weight of one or more polyalkylene glycols (PAG); and (2) one or more ester base oils selected from the group of natural esters, synthetic esters and combinations thereof; wherein the one or more PAG has a molecular weight in the range 1500 to 5000 g/mole, comprises from 10 to 40 percent by weight of units derived from ethylene oxide and from 90 to 60 percent by weight of units derived from propylene oxide; and wherein the one or more PAGs are in the form of block copolymer, reverse block copolymer or combinations thereof is provided. Also provided is a method of enhancing the hydrolytic stability of an ester base oil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.