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

1993-12-07

1999-08-03

Jordan, Charles T.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C09K 700

Patent

active

H00017990

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.

REFERENCES:
patent: Re27145 (1971-06-01), Jones
patent: 3985830 (1976-10-01), Fetters et al.
patent: 4116917 (1978-09-01), Eckert
patent: 4156673 (1979-05-01), Eckert
patent: 4780367 (1988-10-01), Lau et al.
patent: 4849481 (1989-07-01), Rhodes et al.
patent: 5070131 (1991-12-01), Rhodes et al.

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