Shell Oil Comapny

Shell Internationale Research Maatschappij, B.v.

Hiroyuki Tazaki

Hiroshi Kaneko

Mitsuhiro Nagakari

Kumiko Kamata

Noriaki Shinoda

Ryuji Maruyama

Mai Kitagawa

An object of the present invention is to provide a lubricating oil composition for hydraulic actuation which has excellent safety and which is imparted with electrical conductivity in order to prevent the generation of noise that adversely affects devices including hydraulic circuits equipped with an electronic control device for the valve system. The composition uses a hydrocarbon base oil, and the base oil contains from 30 to 250 ppm of ultrabasic magnesium salicylate in terms of magnesium content relative to the total amount of the composition, and from 0.07 to 5.0 mass % of non-dispersible polymethacrylate having a weight-average molecular weight of from 5,000 to 200,000 as a net amount relative to the total amount of the composition. The conductivity of the composition at 25&#xb0; C. is 200 pS/m or more, the flash point is 240&#xb0; C. or more, the pour point is negative 40&#xb0; C. or less, and the coefficient of friction at 140&#xb0; C. by a microclutch is 0.08 or more. This lubricating oil composition can be imparted with conductivity in order to prevent the generation of noise that adversely affects electronic controls when used in machinery equipped with electronic control devices.

Lubricating oil composition for hydraulic actuator equipped with electronic control device

A composition whereby a hydrocarbon-based base oil is used and in this base oil are incorporated, in terms of the total amount of the composition, 30 to 300 ppm of overbased calcium salicylate and, in net weight in terms of the total amount of the composition, 0.07 to 2.0 mass % of a non-dispersant polymethacrylate having a weight average molecular weight of 5000 to 200,000. The electrical conductivity at 25&#xb0; C. of this composition is not less than 200 pS/m, the flash point is not less than 240&#xb0; C., the pour point is &#x2212;40&#xb0; C. or lower and the micro clutch friction coefficient at 140&#xb0; C. is not less than 0.08. This lubricating oil composition may be used in machines fitted with electronic control apparatus and can impart conductivity so as to inhibit the occurrence of 'noise' which is detrimental to electronic control.

Lubricating oil composition

The present invention provides a defoaming agent composition in gel form, of number 1 NLGI grade or harder, for application to the inside wall of a container, being a composition for defoaming bubbles generated from lubricating oil present within a container. The present invention further provides a method of defoaming lubricating oil characterized in that it includes a step of applying a defoaming agent composition in gel form, of number 1 NLGI grade or harder, to the inside wall of a container for lubricating oil and characterized in that this step is a step in which said defoaming agent composition is applied to the inside wall face at or above the oil surface of the lubricating oil, or higher than this.

Defoaming agent composition for lubricating oil and method of defoaming using this

Lubricating oil compositions are provided herein that comprise a mixture of: (A) a hydrocarbon as a low-viscosity constituent, (B) a polyalkylene glycol (PAG) as a high-viscosity constituent wherein the oxygen/carbon weight ratio is in the range of from 0.450 to 0.580, and (C) a compound as a control constituent wherein the oxygen/carbon weight ratio is in the range of from 0.080 to 0.350. Methods of lubricating a surface using such lubricating compositions are also provided herein.

Growing community of inventors

Kanagawa, Japan

Hiroyuki Tazaki