Danford H. Olson - Cypress TX Dale L. Handlin - Houston TX
Assignee:
Shell Oil Company - Houston TX
International Classification:
C10M10700 C10M11902
US Classification:
585 10
Abstract:
A triblock copolymer VI improver comprising terminal hydrogenated polyisoprene blocks and a central polymeric block containing predominantly monoalkenyl aromatic hydrocarbon monomer units. Oil compositions comprising such triblock copolymer VI improvers exhibit a good balance between thickening efficiency and mechanical shear stability combined with relatively high HTHSR viscosities.