Star polymer viscosity index improver for oil compositions
USH1799H · kind H · statutory invention registration
1Cited by
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6Claims
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| Filing date | — |
| Grant date | Aug 3, 1999 |
| Priority date | — |
| Expiry date | — |
Classification
- Technology area (CPC —)General
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 copolymer arms of hydrogenated polyisoprene and polystyrene with sufficient amounts of polystyrene to be finishable as a polymer crumb.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.