Star polymer viscosity index improver for oil compositions

Details Star polymer viscosity index improver for oil compositions Star polymer viscosity index improver for oil compositions

1999-02-17

2000-03-07

McAvoy, Ellen M.

Solid anti-friction devices, materials therefor, lubricant or se

Lubricants or separants for moving solid surfaces and...

Solid hydrocarbon polymer

585 11, 585 13, 525314, 525316, C10M14300, C08F29300

Patent

active

060340428

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.

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