New Japan Chemical Co., Ltd.

Kouji Takahashi

Yasuyuki Kawahara

Hirotaka Tomizawa

Makiko Takii

Disclosed herein is a lubricating oil for bearings comprising (a) a diester represented by General Formula (1) wherein Rand Rare the same or different, and each represents a C-Clinear alkyl group; A represents a C-Clinear alkylene group or A represents a branched alkylene group consisting of a linear alkylene group, the linear alkylene group being the principal chain, and one or more alkyl groups (branches) bonded to the linear alkylene group, wherein the total number of carbon atoms of the linear alkylene group and the one or more alkyl groups is 3 to 10; with the proviso that when A is a branched alkylene group and has two or more alkyl groups, the two or more alkyl groups are not bonded to the same carbon atom; or a mixture of the diester with an additional base oil and (b) at least one member selected from the group consisting of phenol-based antioxidants and amine-based antioxidants, and optionally containing (c) at least one member selected from the group consisting of Phosphorus-based compounds and aliphatic linear monocarboxylic acids, and further optionally containing (d) at least one member selected from the group consisting of benzotriazole-based compounds and gallic acid-based compounds.

Lubricating oil for bearing

A diester represented by the formula wherein A represents a cyclohexane ring, cyclohexene ring or benzene ring, X is H or methyl group, Rand Rare the same or different and each is C3-C18 branched-chain alkyl group, C1-C18 straight-chain alkyl group, C2-C18 straight-chain alkenyl or C3-C18 cycloalkyl, provided that when A is a benzene ring, Rand Rare different from each other and &#x2014;COORand &#x2014;COORare attached to two adjacent carbon atoms of the benzene ring, and having the following properties:

Dicarboxylic diester, process for producing the same, and refrigerating machine lubricating oil comprising the ester

A diester represented by the formula wherein A represents a cyclohexane ring, cyclohexene ring or benzene ring, X is H or methyl group, Rand Rare the same or different and each is C3-C18 branched-chain alkyl group, C1-C18 straight-chain alkyl group, C2-C18 straight-chain alkenyl or C3-C10 cycloalkyl, provided that when A is a benzene ring, Rand Rare different from each other and &#x2014;COORand &#x2014;COORare attached to two adjacent carbon atoms of the benzene ring, and having the following properties:

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Kyoto, Japan

Kouji Takahashi