C.sub.2 -C.sub.5 olefin oligomer compositions as shear stable viscosity index improvers
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United States of America Patent
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Jan 4, 1994
Grant Date -
N/A
app pub date -
Feb 3, 1992
filing date -
Feb 3, 1992
priority date (Note) -
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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.
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