New Japan Chemical Co., Ltd.

Yasuyuki Kawahara

Kouji Takahashi

Hirotaka Tomizawa

Shinya Tsujimoto

Makiko Takii

Hiroshi Kitagawa

Kiyoshi Sadamitsu

Naoki Ikeda

Masafumi Yoshimura

Hiroshi Ishida

Kazuaki Mizoguchi

Akinobu Takegami

Yuji Kawashima

Jun Itsuki

An object of the present invention is to provide a lubricant base oil for power transmission (in particular, a lubricant base oil for traction drives) having a high traction coefficient and a high flash point. The present invention relates to a lubricant base oil for power transmission comprising an alicyclic dicarboxylic acid diester compound represented by general formula (1): wherein Rto Rare the same or different, and each represents hydrogen or linear or branched Calkyl, and two R, two R, two R, two R, and two Rmay respectively be the same or different; and ring A is wherein R represents Calkyl, and n represents 0, 1, or 2; when n represents 2, R may be the same or different.

Lubricant base oil for power transmission

An object of this invention is to provide a lubricating base oil that has a small rate of change in viscosity (a high viscosity index) over a wide temperature range, low viscosity at low temperatures, and good low-temperature fluidity and evaporation resistance, and that allows reduced decomposition thereof. To achieve the object, methylpentanediol diesters obtained by using specific aliphatic monocarboxylic acids are used as a lubricating base oil.

Lubricant base oil for fluid bearing

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:

Lubricating oil for refrigerator, hydraulic fluid composition for refrigerator and method for lubricating of refrigerator

Disclosed are a crystalline polypropylene resin composition comprising a crystalline polyproplylene resin and a &bgr;-nucleating agent, and a method of increasing the proportion of &bgr;-form crystals in a crystalline polypropylene resin molding comprising molding the composition, the &bgr;-nucleating agent being a diamide compound.

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Uji, Japan

Yasuyuki Kawahara