Additive concentrates and lubricating compositions containing these concentrates
Central system fluid composition
Multigrade lubricants containing interpolymers
Hydrocarbon based central system fluid composition
Polymeric compositions, oil compositions containing said polymeric compositions, transmission fluids and hydraulic fluids
Polymeric compositions comprising olefin polymer and nitrogen containing ester of a carboxy interpolymer
Polymeric compositions comprising an oil-soluble polymer and an oil-soluble acrylate polymerization of product
Lubricant blends having high viscosity indices
ApplicationNo. 953698 filed on 10/17/1997
US Classes:508/469, Polymer of alpha, beta-olefinically unsaturated carboxylate monomer (e.g., polymethylmethacrylate, etc.)585/14For fuel use only
ExaminersPrimary: Howard, Jacqueline V.
Attorney, Agent or Firm
Foreign Patent References
International ClassesC10M 143/00
AbstractThis 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° 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.