Kh Neochem Co., Ltd.

Kyowa Hakko Chemical Co., Ltd.

Satoshi Hiyoshi

Toshihiro Inayama

Nobuhito Amemiya

Junya Kishi

Yukihiro Isogai

Masato Kujime

Shigehisa Kishimoto

Shingo Nakayama

Shigeyuki Mori

Suguru Ohara

Shigeaki Kato

Ichiro Minami

Makoto Goto

The present invention provides a refrigerating-machine oil composition which comprises the following ester additive (a) and the following ester base oil (b), the content of the ester additive (a) being 5-45 mass % with respect to the total amount of the refrigerating-machine oil composition. Ester additive (a): At least one ester of isotridecanoic acid with pentaerythritol Ester base oil (b): Polyhydric-alcohol esters comprising esters of two or more aliphatic monocarboxylic acids selected from among C4-9 aliphatic monocarboxylic acids with pentaerythritol.

Refrigerating-machine oil composition and working fluid composition including same for refrigerating machine

A neopentyl glycol diester which is a mixed ester of neopentyl glycol and carboxylic acids is provided, wherein the carboxylic acids consisting of isobutyric acid as well as 2-ethylhexanoic acid and/or 3,5,5-trimethylhexanoic acid. The neopentyl glycol diester may be used in a refrigerant oil or the like which exhibits excellent miscibility with a difluoromethane refrigerant among other properties.

Neopentyl glycol diester

A pentaerythritol tetraester which is a mixed ester of pentaerythritol and carboxylic acids is provided, wherein the carboxylic acids consist of isobutyric acid and 3,5,5-trimethylhexanoic acid and the molar ratio of isobutyric acid to 3,5,5-trimethylhexanoic acid in the carboxylic acids is 36/64 to 80/20. The pentaerythritol tetraester may be used in a refrigerant oil or the like which exhibits excellent miscibility with a difluoromethane refrigerant among other properties.

Pentaerythritol tetraester

A pentaerythritol tetraester which is a mixed ester of pentaerythritol and carboxylic acids is provided, wherein the carboxylic acids comprise isobutyric acid and 2-ethylhexanoic acid and the molar ratio of isobutyric acid to 2-ethylhexanoic acid in the carboxylic acids is 36/64 to 83/17. The pentaerythritol tetraester may be used in a refrigerant oil or the like which exhibits excellent miscibility with a difluoromethane refrigerant among other properties.

An additive for oils that is capable of imparting oils such as lubricant base oils with superior wear resistance properties or friction resistance properties, and a lubricant. An additive for oils that includes a compound represented by formula (I) is used. A and B each represents a single bond or hydrocarbylene or the like, X and Y each represents a sulfur atom or single bond, and W and Z each represents a hydrogen atom or &#x2014;NRRor the like, provided that W and Z are not both hydrogen atoms. Rand Reach represents a hydrogen atom, a hydrocarbyl or a hydrocarbylcarbonyl or the like, and n and m each represents an integer of 0 to 5. 

Additive for oils and lubricant comprising the same

The present invention provides a lubricating oil comprising an alicyclic compound represented by a general formula (I): 

Growing community of inventors

Mie, Japan

Satoshi Hiyoshi