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US 5,883,057 AGranted
Lubricating compositions
AssigneeThe Lubrizol Corporation
InventorsBernard C. Roell, Jr., Curtis R. Scharf, Robert C. Richardson
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AssigneeThe Lubrizol Corporation
InventorsBernard C. Roell, Jr., Curtis R. Scharf, Robert C. Richardson
Estimating the term…
This invention relates to a lubricating composition comprising at least about 30% by weight of at least one mineral oil, having a kinematic viscosity of less than about 8 cSt at 100.degree. C., (A) from about 5% to about 30% by weight at least one polymer having a Mw less than about 10,000, and (B) from about 2% to about 12% by weight of a polymer having a Mw greater than about 15,000, wherein the lubricating composition has a shear loss of less than about 15% in the 20 hour taper bearing shear test. The invention also relates to concentrates used in preparing shear stable lubricating compositions. The present combination of components provides good low and high temperature properties to mineral oils, even at high treat levels. These lubricants have good shear stability and in one aspect have improved oxidation resistance.
A lubricating composition comprising at least about 30% by weight of at least one mineral oil, having a kinematic viscosity of less than about 8 cSt at 100.degree. C., (A) from about 5% to about 30% by weight at least one polymer having a Mw less than about 10,000, and (B) from about 2% to about 12% by weight of a polymer derived from an .alpha.-olefin which has from about 3to about 40 carbons atoms having a Mw greater than about 15,000, wherein the lubricating composition has a shear loss of less than about 15% in the 20 hour taper bearing shear test.
A lubricating composition comprising at least about 30% by weight of a mineral oil, having a kinematic viscosity of less than about 8 cSt at 100.degree. C., (A) from about 5% to about 30% by weight of at least one polyalkene having Mw of less than 10,000, and (B) from about 2% to about 12% by weight of a polyalkene or an ethylene .alpha.-olefin copolymer having a Mw greater than about 15,000, wherein the lubricating composition has a shear loss of less than about 15% in the 20 hour taper bearing shear test.
A concentrate comprising (A) from about 20% about 90% by weight of at least one polymer having a Mw less than about 10,000, (B) from about 8% to about 40% by weight of a polymer having a Mw greater than about 15,000, wherein a lubricating composition prepared from the concentrate has a shear loss of less than about 15% in the 20 hour Taper Bearing Shear Test.
Dependencies are inferred from the claim text.