Ashless or low-ash synthetic base compositions and additives therefor
US5089156A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 1990 |
| Grant date | Feb 18, 1992 |
| Priority date | — |
| Expiry date | Oct 10, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2070/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An ashless or low-ash oleaginous liquid composition comprising a major amount of hydrogenated poly-.alpha.-olefin oligomer fluid having a viscosity in the range of about 2 to about 10 cSt at 100.degree.C., and minor amounts of at least the following: A) hydrogenated poly-.alpha.-olefin oligomer fluid having a viscosity in the range of about 40 to about 120 cSt at 100.degree.C.; and B) antiwear/extreme pressure agent selected from phosphorus-containing ashless dispersant, boron-containing ashless dispersant, and phosphorus- and boron-containing ashless dispersant. Compositions of this type can be formed having excellent high and low temperature viscosity characteristics and excellent shear stability. To this end, the preferred compositions are devoid or substantially devoid of conventional polymeric high molecular weight viscosity index improvers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.