Idemitsu Kosan Company, Limited

Hirotaka Yamasaki

Masato Kaneko

Hiroaki Koshima

Motoharu Ishikawa

Tatsuya Egawa

Yoshio Hironaka

Kenji Mogami

Tomiyasu Minokami

Satoshi Nagao

Jitsuo Shinoda

Toyokazu Handa

Shigeru Kamimori

Tokuyuki Yoshimoto

Masahisa Gotoh

Keiji Fujita

Yoshikazu Hirao

Akihisa Ogawa

Toshiharu Takizawa

The lubricating oil composition contains a base oil, a phosphate ester derivative represented by a formula (1) below and a zinc compound. An element ratio (Zn/P) between zinc (Zn) and phosphorus (P) in the lubricating oil composition is 0.55 or more at a mole ratio. In the formula, Y represents S (sulfur) or O (oxygen); Rrepresents an organic group having 4 to 24 carbon atoms; Rrepresents a divalent organic group having 1 to 6 carbon atoms; and n represents an integer of 1 to 3.

Lubricant composition

A lubricating oil for compression-type refrigerators using a refrigerant containing pentafluoroethane which lubricating oil comprises a polyvinyl ether compound having (a) a constituting unit represented by general formula (I):

Lubricating oil for compression-type refrigerators containing pentafluoroethane and a polyvinyl ether

Process for producing an ether compound

Disclosed is a substance useful as a detergent-dispersant which has excellent stability at high temperatures and has an oxidation stability, a detergent-dispersant containing the same, a process of producing it, and fuel oil and lubricating oil composition comprising it.

Mannich reaction product and process for producing the same and use of

A process for producing a polycyanoaryl ether powder which comprises reacting a dihalogenobenzonitrile, a dihydric phenol and an alkali metal salt in the presence of a polymerization solvent, and distilling the solvent, while pulverizing the reaction mixture under agitation. The process produces a polycyanoaryl ether powder having excellent physical properties and is useful as a material for electronic appliances, electric appliances and parts of machines.

Process for producing polycyanoaryl ether powder

A process for producing aromatic nitrile, comprising reacting aromatic halide substituted by a nitro group in the ortho position relative to the halogen atom with 0.1 to 0.99 mol of cuprous cyanide and 0.1 to 2.0 mol of alkali cyanide, both being per mol of said aromatic halide, in a polar solvent, the amount of said aprotic solvent being 0.1 to 30 parts by weight per 100 parts by weight of said aromatic halide.

Process for producing aromatic nitrile

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Sodegaura, Japan

Hirotaka Yamasaki