Viscosity index improver with high thickening power

Details Viscosity index improver with high thickening power Viscosity index improver with high thickening power

1981-12-16

1983-10-25

Howard, Jacqueline V.

Chemistry of hydrocarbon compounds

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

Component of indefinite molecular weight greater than 150

252 327E, 252 515A, C10M 118

Patent

active

044120877

ABSTRACT:
Hydrogenated random block conjugated diene/monovinylarene copolymers with a terminal monovinylarene block having a diene content in the range of 44 to 70 weight percent, normalized vinyl in the range 30.2-51.3 percent, percent vinyl based on copolymer plus percent styrene in the range 59.8-71.5 percent, and molecular weight M.sub.n in the range 94,000-199,000, used as viscosity index improver in lubricating oil, exhibits unusually high thickening power, yet provides viscosity index, pour point, and shear loss at very desirable levels.

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Gruse et al., Chemical Technology of Petroleum (McGraw-Hill 1960), pp. 15, 16, 52, 53.

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