Asymmetric triblock copolymer viscosity index improver for oil c

Details Asymmetric triblock copolymer viscosity index improver for oil c Asymmetric triblock copolymer viscosity index improver for oil c

1994-08-11

1995-10-17

Johnson, Jerry D.

Compositions

Electrolytes for electrical devices

525314, 585 11, C10M14312, C08F29300, C08F29500, C08F29700

Patent

active

054587921

ABSTRACT:
The present invention includes asymmetric triblock copolymers which are used as viscosity index improvers in oil compositions formulated for high performance engines. The triblock copolymers have the block structure hydrogenated polyisoprene-polystyrene-hydrogenated polyisoprene wherein the ratio of the number average molecular weights of the first and second hydrogenated polyisoprene blocks is at least 4.

REFERENCES:
patent: 3772196 (1973-11-01), St. Clair et al.
patent: 3775329 (1973-11-01), Eckert
patent: 4194057 (1980-03-01), Brankling et al.
patent: 4788361 (1988-11-01), Olson et al.
patent: 5296547 (1994-03-01), Nestegard et al.
patent: 5393787 (1995-02-01), Nestegard et al.

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