Polymeric viscosity index additive and oil composition comprisin

Details Polymeric viscosity index additive and oil composition comprisin Polymeric viscosity index additive and oil composition comprisin

1989-01-23

1990-02-13

Briggs, Sr., Wilbert J.

Chemistry of hydrocarbon compounds

Product blend, e.g., composition, etc., or blending process...

Component of indefinite molecular weight greater than 150

585 13, C10M14310, C10M14314, C08L 5302

Patent

active

049008757

ABSTRACT:
A star-shaped polymer useful as a polymeric VI improver comprising at least one arm which is a block copolymer containing a cunjugated diolefin block and a monoalkenyl aromatic hydrocarbon block and a plurality of arms which are either a homopolymer of a conjugated diolefin or a copolymer of two or more conjugated diolefin or a copolymer of two or more conjugated diolefins. Oil compositions comprising star-shaped VI improvers of this type exhibit relativelylow HTHSR viscosities, and hence, improved fuel efficients when used in automotive applications. Oil compositions comprising star-shaped VI improvers of this type also exhibit improved low temperature pumpability.

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