Idemitsu Kosan Company, Limited

Katsumi Hashimoto

Hideo Kanamori

Akira Sasaki

Isoo Suzuki

Kohei Nakatani

Yasusi Aida

Toshiyuki Harada

Hydraulic working oil composition

A base oil for a lubricating oil and a lubricating oil composition containing said base oil, which are to be used in a mechanical apparatus with an orifice mechanism, are disclosed. The base oil has a kinematic viscosity at 40.degree. C. or 3 to 500 cSt, a pour point of -25.degree. C. or lower and a cloud point of -25.degree. C. or lower. The lubricating oil composition contains as major components (A) the above base oil and (B) at least one additive selected from a viscosity index improver, a pour point depressant, an extreme pressure agent, an anti-wear agent, an oiliness agent and an antioxidant. The base oil and the lubricating oil composition are excellent in working properties at low temperatures and thus can be effectively used in a mechanical apparatus with an orifice mechanism, particularly to be used at low temperatures.

Base oil of lubricating oil for mechanical apparatuses with orifice

A method of lubricating a metal working machine which has (i) at least one sliding machine surface requiring lubication and (ii) a metal working section wherein metal is worked in contact with a metal working fluid, said method comprises applying a lubricating oil composition to said at least one sliding surface and using as said metal working fluid an aqueous working fluid composition comprising said lubricating oil composition diluted with water, said lubricating composition comprising;

Lubricating oil composition serving as sliding surface oil and metal

A method of lubricating a metal working machine which has (i) at least one sliding machine surface requiring lubrication and (ii) a metal working section wherein metal is worked in contact with a metal working fluid, said method comprises applying a lubricating oil composition to said at least one sliding surface and using as said metal working fluid an aqueous working fluid composition comprising said lubricating oil composition diluted with water, the ratio of water to said lubricating oil composition being at least 3 to 1,

Method of lubricating working machinery

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Ichihara, Japan

Katsumi Hashimoto