Star shaped asymmetric block copolymer of monoalkenyl aromatic h

Details Star shaped asymmetric block copolymer of monoalkenyl aromatic h Star shaped asymmetric block copolymer of monoalkenyl aromatic h

1987-07-10

1989-07-18

Briggs, Sr., Wilbert J.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

252 9, 252 43, 525193, 525250, 525271, 524534, C08F29704

Patent

active

048494810

ABSTRACT:
A star-shaped polymer useful as a polymeric VI improver comprising at least one arm which is a block copolymer containing a conjugated 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 tow or more conjugated diolefin or a copolymer of two or more conjugated diolefins. Oil compositions comprising star-shaped VI improvers of this type exhibit relatively low HTHSR viscosities, and hence, improved fuel efficiencies 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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