Lubricant mixtures and grease compositions based thereon
AssigneeShell Oil Company
InventorsRobert John Gordon Roth, Georgina Ann Winterburn
Life of this patent
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Abstract
The present invention provides lubricant mixtures for use as base fluid in bearing grease comprising 25 to 90 percent w/w of a liquid ester having a viscosity at 40.degree. C. in the range 100 to 200 mm.sup.2 /s, and 75 to 10 percent w/w of a liquid poly-.alpha.-olefin having a viscosity at 100.degree. C. in the range 2 to 10 mm.sup.2 /s, and bearing grease compositions containing a major proportion of such lubricant mixtures, particularly such compositions containing a clay thickener.
Claims15
A lubricant mixture suitable for use as base fluid in bearing grease, the mixture comprising from about 25 to about 90 percent w/w of a liquid ester having a viscosity at 40.degree. C. in the range of about 100 mm.sup.2 /s to about 200 mm.sup.2 /s and from about 75 percent to about 10 percent w/w of a liquid poly-.alpha.-olefin having a viscosity at 100.degree. C. in the range of about 2 mm.sup.2 /s to about 10 mm.sup.2 /s.
A bearing grease composition which comprises a major amount of a lubricant mixture comprising from about 25 percent to about 90 percent w/w of a liquid ester having a viscosity at 40.degree. C. in the range of about 100 mm.sup.2 /s to about 200 mm.sup.2 /s and from about 75 percent to about 10 percent w/w of a liquid poly-.alpha.-olefin having a viscosity at 100.degree. C. in the range of about 2 mm.sup.2 /s to about 10 mm.sup.2 /s in admixture with a thickener and at least one additional component selected from solid lubricants, extreme pressure additives, stabilizers, anti-oxidants and anti-corrosion additives.
Dependencies are inferred from the claim text.