Denso Corporation

Idemitsu Kosan Company, Limited

Kabushiki Kaisha Toyota Jidoshokki

Jx Nippon Oil Energy Corporation

Kyodo Yushi Co., Ltd.

Masataka Muto

Takahiro Hoshida

Masato Kaneko

Takayuki Kato

Harutomo Ikeda

Shozo Ikejima

Masahito Yamashita

Masaki Inoue

Hitoshi Takahashi

Ken Sawada

Souichirou Konno

Akira Tada

Tokue Sato

Masato Takamatsu

Masami Sanuki

Terasu Yoshinari

Tomonobu Komoriya

Iwaki Hirooka

Shigeyuki Mori

Masahiro Suzuki

Yoshinori Fukushima

Shuichi Yasuda

Hajime Mukawa

Takekazu Kano

Genki Hayashi

Kazuki Yamamoto

Satoru Nakazawa

The invention provides a grease composition containing a base oil, a thickener, and an anti-flaking additive such as a compound represented by, for example, formula (1-1), which grease composition can prevent the white layer flaking of the rolling bearings. (In the formula, R1 and R4 are each independently a straight-chain or branched alkyl or alkenyl group having 1 to 20 carbon atoms.) 

Grease composition

The present invention provides a working fluid composition for a refrigerating machine, comprising a refrigerating machine oil that comprises an ester of a polyhydric alcohol and a fatty acid, an epoxy compound, and a phosphorus compound, and a fluoropropene refrigerant, wherein the polyhydric alcohol constituting the ester comprises pentaerythritol and dipentaerythritol, the fatty acid constituting the ester comprises at least one selected from fatty acids having 4 to 9 carbon atoms, and the epoxy compound and the phosphorus compound satisfy a condition represented by the following formula (1). 

Working fluid composition for refrigerator, and refrigerator oil

Provided is a refrigerating machine oil composition, which is to be used for a refrigerant including a mixture of an unsaturated fluorinated hydrocarbon compound, a saturated fluorinated hydrocarbon compound and CO, contains a base oil which includes at least one selected from a polyoxyalkylene glycol, a polyvinyl ether, a copolymer of a poly(oxy)alkylene glycol or a monoether thereof and a polyvinyl ether, and a polyol ester and has a kinematic viscosity at 100&#xb0; C. of 2 mm/s or more and 50 mm/s or less and a hydroxyl value of 5 mgKOH/g or less, is able to be used for a refrigerating machine system using a refrigerant having a low global warming potential and usable especially for a car air conditioner or the like and including a mixture of an unsaturated fluorinated hydrocarbon compound, a saturated fluorinated hydrocarbon compound and CO, and exhibits not only excellent compatibility with the refrigerant but also excellent stability.

Refrigerator oil composition and refrigerator system

A lubricating oil composition for refrigerator including a base oil and an acid scavenger, and a compressor using the composition are provided, where the acid scavenger is a polyalkylene glycol derivative represented by a formula (1) as follows:R&#x2014;[(OR)&#x2014;OR]&#x2003;&#x2003;(1) and the base oil is at least one compound selected from a group consisting of polyvinyl ether, polyalkylene glycol and an ether-base compound represented by a formula (2) as follows,R-[(OR)-(X)&#x2014;(OR)-R&#x2003;&#x2003;(2)where meanings of respective signs are as described in the specification.

Lubricant composition for refrigerating machine and compressor using the same

A lubricating oil composition for refrigerators comprising a base oil which comprises as a main component a polyol ester compound obtained from a polyhydric alcohol selected from among pentaerythritol, dipentaerythritol, trimethylolpropane, and neopentyl glycol and a Cto Caliphatic monocarboxylic acid and which has an acid value of 0.02 mgKOH/g or less and a hydroxyl value of 5 mgKOH/g or less. A compressor using the lubricating composition. The lubricating oil composition is applicable to such refrigerators that use a refrigerant having a specific structure, such as an unsaturated fluorinated hydrocarbon compound, and being usable in current car air conditioner systems, and has excellent compatibility with the refrigerant, good sealing properties, capability of imparting a low coefficient of friction to sliding members and, yet, excellent stability. The compressor uses the lubricating composition.

Lubricating oil composition for refrigerators and compressors with the composition

Provided is a lubricant composition for a refrigerator, which is characterized by using a substance mainly containing a polyoxyalkylene glycol derivative and having a hydroxyl number of 5 mgKOH/g or less, as a base oil. Also provided is a compressor using such the lubricant composition for a refrigerator. The lubricant composition for a refrigerator is used for a refrigerator which uses a refrigerant having a specific structure such as an unsaturated fluorohydrocarbon and being usable in current air-conditioning systems for cars or the like. The lubricant composition for a refrigerator exhibits excellent compatibility with the refrigerant, while having excellent stability. The compressor uses such the lubricant composition for a refrigerator.

Lubricant composition for refrigerator and compressor using the same

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Kariya, Japan

Masataka Muto