Idemitsu Kosan Company, Limited

Nsk Corporation

Hiromichi Seiki

Masato Kaneko

Hisashi Machida

Hitoshi Hata

Kazuaki Abe

Kosaku Honna

Mitsuhiro Iwata

Hideo Kanamori

Hideo Igarashi

Flame retardant hydraulic oil containing a partial ester of a polyol and a monocarboxylic acid

Flame retardant hydraulic oil containing a synthetic ester formed by reaction of a polyol and a mixture of carboxylic acids including oleic acid and isostearic acid

Refrigerator oil composition for hydrogen-containing hydrofluorocarbon

Disclosed is a refrigerating machine oil composition, comprising a base oil and a metal salt of a carboxylic aid having from 3 to 60 carbon atoms. The refrigerating machine oil (lubricating oil) of the present invention is very well miscible with hydrogen-containing Flon refrigerants such as Flon 134a, achieves an excellent lubrication performance and is good enough to bring forth marked improvement of a wear resistance, particularly a wear resistance of aluminum-steel friction surfaces.

Refrigerating machine oil composition

Lubricating oil composition comprising a specified base oil and an alkyl

Lubricating oil composition for flon atmosphere comprising a

The novel compound provided by the invention is a higher carboxylic acid triester of adamantane triol such as adamantane-1,3,5-triol tricaprylate not known in the prior art. The compound has a high kinematic viscosity at elevated temperatures despite the low pour point and has high thermal stability in an oxidizing atmosphere so that it is useful as an ingredient of a high-performance lubricating oil.

Higher carboxylic acid triester of adamantane triol and lubricating oil

Lubricating oil composition of mineral oil and polyester for wet brake

The novel compound provided by the invention is a higher carboxylic acid triester of adamantane triol such as adamamtane-1,3,5-triol tricaprylate not known in the prior art. The compound has a high kinematic viscosity at elevated temperatures despite the low pour point and has high thermal stability in an oxidizing atmosphere so that it is useful as an ingredient of a high-performance lubricating oil.

The present invention provides a lubricating oil composition comprising 97 to 60% by weight of mineral oil and 3 to 40% by weight of polyester, said mineral oil having a kinematic viscosity of 100.degree. C. of 2 to 50 centistokes, a pour point (as determined by JIS K-2269) of not more than -30.degree. C., and a viscosity index (as determined by JIS K-2283) of not less than 70. This lubricating oil composition is suitably, used for lubrication of parts including a wet brake and a wet clutch, such as automatic transmissions and tractors. The lubricating oil composition of the present invention has a suitable viscosity at high temperatures and further is low in low temperature viscosity. Furthermore the lubricating oil composition of the present invention is excellent in friction characteristics, oxidation stability and also in seal rubber compatibility.

Lubricating oil composition

Lubricating oil composition which comprises: lubricating base oil,

The present invention relates to a lubricant for use at high temperature, comprising: (A) from 25 to 98% by weight of an arylalkyl silicone having a repeating unit represented by the general formula (I); and (B) from 75 to 2% by weight of a fatty acid ester of a hindered alcohol. The lubricant of the invention is suitable for use as an engine oil. The general formula (I) follows: ##STR1## wherein R.sup.1 is an alkyl group containing from 1 to 6 carbon atoms, and R.sup.2 is an alkyl group containing from 1 to 3 carbon atoms or a hydrogen atom.

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Ichihara, Japan

Hiromichi Seiki