C - Chemistry – Metallurgy – 10 – M
Patent
C - Chemistry, Metallurgy
10
M
C10M 145/14 (2006.01) C10M 169/04 (2006.01)
Patent
CA 2161026
A lubricant oil composition suitable for use as a tractor hydraulic fluid which comprises (a) a lubricating oil base stock which is a blend of a major amount of paraffinic mineral oil and a minor amount of a naphthenic mineral oil,and (b) a blend of a polymethacryalte viscosity index improver having a weight average molecular weight of 25,000 to 150,000 and a shear stability index less than 5 and a polymethacryate viscosity index improver having a weight average molecular weight of 500,000 to 1,000,000 and a shear stability index of 25 to 60. The formulated oil composition has a kinematic viscosity of 8.0 to 9.0 cSt at 100°C, a minimum kinematic viscosity of 7.0 cSt at 100°C after 30 shear cycles, a maximum Brookfield viscosity of 17,000 cSt at -40°C and a maximum pour point of -45°C.
Borden Ladner Gervais Llp
Exxonmobil Research And Engineering Company
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