Mitsubishi Oil Co., Ltd.

Other

Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Jukogyo Kabushiki Kaisha

Nippon Steel Chemical Co., Ltd.

Masayoshi Muraki

Noboru Masuda

Yukiharu Beppu

Shozaburo Konishi

Hajime Yoshida

Susumu Kawaguchi

Sou Suzuki

Takeshi Izawa

Kazuo Tagawa

Yasushi Akahori

Takayoshi Hamada

Koji Tsuchimoto

Kenichi Fujimoto

Tetsuo Takito

Yoshiharu Horita

Norimasa Nishiura

Nobuo Murata

Michio Hoshino

Tomohiro Magome

A lubricant composition for a refrigerating machine employing a HFC type refrigerant containing at least one selected from the group consisting of HFC-32, HFC-125 and HFC-134a, which comprises a base oil of an ester formed from a dihydric or higher polyol as an alcohol and a monobasic aliphatic acid, alone or as a mixture thereof; and additives of, based on the total amount, 1) not less than 0.01 vol % and less than 1.0 vol % of a phosphate, 2) from 0.01 to 1.0 vol % of at least one of an alkylphosphorothionate and an arylphosphorothionate and 3) from 0.01 to 1.0 vol % of an epoxy compound.

Lubricant compositions for refrigerating machine employing HFC-32, HFC-125 or HFC-134A

A refrigerating machine oil composition for vapor compression type refrigerating machines is disclosed which can be used with either of HCFC refrigerants and HFC refrigerants. The inventive machine oil composition comprises a polyol ester (ester compound) as a base oil. Furthermore, the base oil contains from 1.0 to less than 5.0% by weight of a phosphate, from 0.1 to 2.0% by weight of an alkyl phosphorothionate and/or an aryl phosphorothionate, and from 0.05 to 2.0% by weight of an epoxy compound. The composition is free from sludge formation and insufficient lubricity, which are drawbacks of the polyol ester, due to the synergistic effect of these additives. On the other hand, the inventive composition provides the desirable properties of a polyol ester base oil, namely, good compatibility with refrigerants, high electrical insulating properties, and low hygroscopicity.

Refrigerating machine oil composition for use with HCFC and HFC

A refrigerating machine oil composition suitable for a compressor using a hydrofluorocarbon as a refrigerant, which comprises 100 parts by weight of a polyol ester as a base oil, from 7.0 to 15.0 parts by weight of a phosphate, and from 0.2 to 3.0 parts by weight in total of a 1,2-epoxyalkane and/or a vinylcyclohexene dioxide. The use of the refrigerating machine oil composition improves wear resistance of sliding portions of compressors and is free from the formation of sludges derived from the polyol ester used as a base oil of the oil composition. A rotary compressor using the oil composition is also disclosed.

Refrigerating machine oil composition for use with HFC refrigerant

A lubricating oil is disclosed, which mainly is composed of a naphthenic hydrocarbon having 19 carbon atoms comprising two cyclohexane rings which have methyl-substitution at the 1, 2 and 4 positions thereof, the two cyclohexane rings being linked by a methylene group.

Lubricating oil for traction drives

The disclosure relates to a composition suitable for use in mechanical power transmission devices. It has as its principal component a hydrocarbon oil which has from 19 to 30 carbon atoms, inclusive, and three six-membered carbocyclic rings and consists of a mixture of compounds having the following formula: ##STR1## wherein R.sup.1 is a divalent straight or branched chain radical C.sub.y H.sub.2y where y is an integer of 1 through 3; R.sup.2 is a straight chain radical C.sub.z H.sub.2z where z is an integer of 1 through 3; R.sup.3, R.sup.4, and R.sup.5 are the same or different alkyl groups having from 1 through 4 carbon atoms; l, m, and n each is an integer from zero through 3; and x is zero or 1; and wherein rings A and B are hydrogenated benzene rings and ring C is a hydrogenated benzene ring when x is 1 and a hydrogenated benzene ring or a cyclohexane ring when x is zero said hydrogenated benzene rings being saturated with hydrogen to the extent of at least 80% but less than 100% of the theoretical, and the composition can additionally contain one or more of an antioxidant, a rustproofing agent, a viscosity index improver, and antifoaming agent.

Composition suitable for mechanical power transmission and process for

Growing community of inventors

Kanagawa, Japan

Masayoshi Muraki