Star polymer viscosity index improver for oil compositions
US6034042A · kind A · utility
13Cited by
12References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 17, 1999 |
| Grant date | Mar 7, 2000 |
| Priority date | — |
| Expiry date | Feb 17, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/28
- 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 tetrablock copolymer arms of hydrogenated polyisoprene-polybutadiene-polyisoprene with a block of polystyrene and which provide excellent low temperature performance in lubricating oils, exhibit good thickening efficiency, and are finishable as polymer crumb.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.