Infineum International Limited

Chin Chu

Stuart Briggs

Jacob I Emert

Rolfe J Hartley

Jai G Bansal

A lubricating oil composition formulated with a viscosity index (VI) improver composition including a combination of an ethylene &#x3b1;-olefin copolymer having no greater than 66 mass % of units derived from ethylene, and a linear diblock copolymer including at least one block derived primarily from a vinyl aromatic hydrocarbon monomer, and at least one block derived primarily from diene monomer.

Lubricating oil compositions

A polymer suitable for use as a viscosity index improver for lubricating oil compositions, which is at least one, at least partially hydrogenated linear or star-shaped random copolymer of isoprene and butadiene, in which at least 70 wt. % of the butadiene is incorporated into the polymer as 1,4 units and the weight ratio of isoprene addition product to butadiene addition product in the copolymer is in a range of from about 90:10 to about 70:30.

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Westwood, NJ, United States of America

Chin Chu