C.sub.2 -C.sub.5 olefin oligomer compositions as shear stable vi

Details C.sub.2 -C.sub.5 olefin oligomer compositions as shear stable vi C.sub.2 -C.sub.5 olefin oligomer compositions as shear stable vi

1992-02-03

1994-01-04

Pal, Asok

Chemistry of hydrocarbon compounds

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

Component of indefinite molecular weight greater than 150

585 10, 585 11, 585 17, 585 19, 585411, 585452, 208 18, 208 19, C10L 116

Patent

active

052762270

ABSTRACT:
Liquid hydrocarbon lubricant viscosity index improver compositions are disclosed having high shear stability. The compositions comprise the homopolymer or copolymer product of the oligomerization of C.sub.3 to C.sub.5 alpha-olefin or mixtures thereof, with or without ethylene as co-monomer. The process is carried out under oligomerization conditions in contact with a reduced valence state Group VIB metal catalyst on porous support. The viscosity index improver of the invention has a regio-irregularity of at least 20%, weight average molecular weight between 6,000 and 30,000 and molecular weight distribution between 2 and 5.

REFERENCES:
patent: 4827064 (1989-05-01), Wu
patent: 4827073 (1989-05-01), Wu
patent: 4990709 (1991-02-01), Wu
patent: 5012020 (1991-04-01), Jackson et al.
patent: 5068476 (1991-11-01), Wu et al.
patent: 5146021 (1992-09-01), Jackson et al.
patent: 5157177 (1992-10-01), Pelrine et al.

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