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Title:
BASE OIL FOR HYDRAULIC OIL AND HYDRAULIC OIL COMPOSITIONS
Document Type and Number:
WIPO Patent Application WO/2007/001000
Kind Code:
A1
Abstract:
The invention aims at providing a base oil which is suitable for the hydraulic oil for hydraulic systems provided with filters having openings of 50μm or below and which can inhibit the flow rate reduction of hydraulic pumps at low temperatures of -30°C or below to enable normal actuation of the hydraulic systems; and hydraulic oil compositions containing the base oil, particularly, those useful as the common lubricating oil to tractors and change gears which are provided with the above hydraulic systems. In order to attain the aim, the invention provides a base oil for hydraulic oil which has a kinematic viscosity of 1.5 to 6 mm2/s at 100°C, a pour point of -10°C or below, a coefficient of viscosity of 100 or above, a percent CP of 70 or above, a percent CA of 2 or below, and an aniline point of 106°C or above and which contains a catalytically dewaxed mineral base oil and/or a mineral base oil having a tertiary carbon content of 7.4% or above based on the whole constituent carbon; and hydraulic oil compositions containing the base oil and poly(meth)acrylate additives.

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Inventors:
SHIRAHAMA SHINICHI (JP)
AOKI TOORU (JP)
ISHIMARU MITSUAKI (JP)
Application Number:
PCT/JP2006/312811
Publication Date:
January 04, 2007
Filing Date:
June 27, 2006
Export Citation:
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Assignee:
NIPPON OIL CORP (JP)
SHIRAHAMA SHINICHI (JP)
AOKI TOORU (JP)
ISHIMARU MITSUAKI (JP)
International Classes:
C10M101/02; C10M169/04; C10M145/14; C10N20/00; C10N20/02; C10N30/02; C10N30/08; C10N40/04; C10N40/08
Domestic Patent References:
WO2006073198A12006-07-13
Foreign References:
JP2004182931A2004-07-02
JP2000109877A2000-04-18
Other References:
See also references of EP 1908816A4
Attorney, Agent or Firm:
HOSHINO, Tetsuro et al. (3rd Floor Oak Building Kyobashi, 16-10, Kyobashi 1-chom, Chuou-ku Tokyo 31, JP)
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