Lubricating oils comprising low saturate basestock
US5932525A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1997 |
| Grant date | Aug 3, 1999 |
| Priority date | — |
| Expiry date | Apr 3, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M2217/06
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Multigrade lubricating oils for use in lubricating internal combustion engines, using basestocks with low levels (<75 mass %) of saturated hydrocarbons, comprise less than 3 mass % of ashless dispersant derived from a polymer of number average molecular weight (Mn) of not greater than 5000, and a viscosity modifier package to give the desired viscometrics comprising at least one multifunctional viscosity modifier. These oils meet stringent engine performance requirements and specifically give adequate varnish inhibition without very high treat levels of dispersants and/or use of specific detergent systems so avoiding problems of oxidation stability, compatibility and engine performance debits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.