Lubricant blends having high viscosity indices
AssigneeMobil Oil Corporation
InventorMargaret M. Wu
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Abstract
Novel lubricant mixtures are disclosed having unexpectedly high viscosity indices. The mixtures are blends of high viscosity index polyalphaolefins prepared with activated chromium on silica catalyst and polyalphaolefins prepared with BF3, aluminum chloride, or Ziegler-type catayst. Superior blends are also prepared from HVIXPAO with mineral oil and/or other synthetic liquid lubricants.
Claims23
A lubricant mixture having enhanced viscosity index comprising,
- hydrogenated polyalpha-olefin having a branch ratio of less than 0.19 and pour point below -15.degree. C. and liquid lubricant taken from the group consisting of mineral oil, hydrogenated polyolefins comprising polypropylene, polyisobutylene and polyalpha-olefins with a branch ratio greater than 0.19, polyethers, vinyl polymers, polyfluorocarbons, polychlorofluorocarbons, polyesters, polycarbonates, polyurethanes, polyacetaIs, polyamides, polythiols, their copolymers, terpolymers and mixtures thereof.
A lubricant mixture having enhanced viscosity index comprising, hydrogenated C.sub.30 H.sub.62 hydrocarbons having a branch ratio of less than 0.19 and pour point below -15.degree. C. and liquid lubricant taken from the group consisting of mineral oil, hydrogenated polyolefins comprising polypropylene, polyisobutylene and polyalphaolefins with a branch ratio greater than 0.19, vinylpolymers, polyfluorocarbon, polychlorofluorocarbons, polyesters, polycalonates, polyurethanes, polyacetals, polyamides, polythiols, their copolymers, terpolymers and mixtures thereof.
Dependencies are inferred from the claim text.