C - Chemistry – Metallurgy – 10 – M
Patent
C - Chemistry, Metallurgy
10
M
C10M 101/02 (2006.01) C10M 105/38 (2006.01) C10M 107/10 (2006.01) C10M 111/02 (2006.01) C10M 111/04 (2006.01) C10M 169/04 (2006.01)
Patent
CA 2284343
The present invention provides a hydraulic oil composition compris- ing a base oil composed of a mineral oil (A) and/or synthetic oil (B) incorporated with 20 wt% or less, based on the whole composition, of one or more; types of additives (C) including viscosity index improver and/or pour point depressant, and having a kinematic viscosity of 1 to 20 mm2/s at 100°C, a viscosity index of 140 or more and a Brool~eld viscosity of 2000 mPa~s or less at -40°C, wherein the mineral oil (A) is a deeply dewaxed mineral oil (a) having a kinematic viscosity of 2 to 3 mm2/s at 100°C, pour point of -30°C or less and cloud point of -27.5°C or less, or a mixed mineral oil of the deeply dewaxed mineral oil (a) and a low-viscosity mineral oil (b) having a kinematic viscosity of 1.0 to 6.0 mm2/s at 40°C, and the synthetic oil (B) is a poly-a-olefin (c) having a kinematic viscosity of 1.5 to 45 mm2/s at 100°C, and/or an ester compound (d) having a kinematic viscosity of 1.5 to 20 mm2/s at 100°C and pour point of - 30°C or less.
Kamata Eiji
Ohashi Hiroshi
Ohtsuka Naoto
Borden Ladner Gervais Llp
Tonen Corporation
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