Dispersant viscosity index improvers

Details Dispersant viscosity index improvers Dispersant viscosity index improvers

1993-07-30

1994-11-01

McAvoy, Ellen M.

Compositions

Electrolytes for electrical devices

525 92, 525180, 525190, C10M14902

Patent

active

053605640

ABSTRACT:
An engine oil formulation comprising of a pour point depressant, a dispersant inhibitor package containing a reduced amount of ashless dispersant, a synthetic or mineral based oil or mixtures thereof, and a modified hydrogenated star polymer of a conjugated diolefin and a modified hydrogenated copolymer of conjugated diolefins and monoalkenyl arenes is disclosed. The engine oil has and exhibits improved dispersancy and rheological properties which is attributable to the presence therein of the modified hydrogenated star polymer of a conjugated diolefin and a modified hydrogenated copolymer of conjugated diolefins and monoalkenyl arenes. A process of producing the inventive engine oil composition is also disclosed.

REFERENCES:
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patent: 4141847 (1979-02-01), Kiovsky et al.
patent: 4234435 (1980-11-01), Meinhardt et al.
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patent: 4358565 (1982-11-01), Eckert
patent: 4409120 (1983-10-01), Martin
patent: 4557849 (1985-12-01), Eckert
patent: 5049294 (1991-09-01), Van Zon et al.

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