Gear oil viscosity index improvers

Details Gear oil viscosity index improvers Gear oil viscosity index improvers

1990-09-28

1991-12-03

Michl, Paul R.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524481, 524486, 524502, 524534, 524572, 524573, C08K 501

Patent

active

050701312

ABSTRACT:
A gear oil composition is provided, the composition comprising a hydrogenated star conjugated diolefin polymer having arms with weight average molecular weights between about 3,000 and about 15,000. Such star polymers are effective as viscosity index improvers, and yet are sufficiently shear stable for service in gear oil lubricants.

REFERENCES:
patent: 4077893 (1978-03-01), Kiovsky
patent: 4082680 (1978-04-01), Mitacek
patent: 4116917 (1978-09-01), Eckert
patent: 4141847 (1979-02-01), Kiovsky
patent: 4156673 (1979-05-01), Eckert
patent: 4358565 (1982-11-01), Eckert
patent: 4427834 (1984-01-01), Martin
patent: 4490267 (1984-12-01), Eckert
patent: 4788361 (1988-11-01), Olson et al.
patent: 4942210 (1990-07-01), Kuntz
patent: 4970254 (1990-11-01), Willis et al.

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