Star polymer viscosity index improver for oil compositions
US5460739A · kind A · utility
14Cited by
20References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1994 |
| Grant date | Oct 24, 1995 |
| Priority date | — |
| Expiry date | Sep 9, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2070/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention includes star polymers which can be used as viscosity index improvers in oil compositions formulated for high performance engines. The star polymers have triblock copolymer arms of hydrogenated polyisoprene-polybutadiene-polyisoprene, which provide excellent low temperature performance in lubricating oils, and can be used in the presence of low pour point depressant concentrations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.