Star polymer viscosity index improver for oil compositions
US5458791A · kind A · utility
9Cited by
17References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1994 |
| Grant date | Oct 17, 1995 |
| Priority date | — |
| Expiry date | Jul 1, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S525/901
- 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 and polystyrene wherein the polystyrene is placed near the core of the star polymer to provide excellent low temperature performance and finishability as a polymer crumb.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.