Idemitsu Kosan Company, Limited

Idemitsu Petrochemical Co., Ltd.

Nissei Company, Ltd.

Akihiro Shishikura

Noriyuki Kunishi

Haruhito Sato

Go Watanabe

Hiroki Sekiguchi

Toshinaka Shinbutsu

Shuichi Amano

Hiroaki Motegi

Seiji Takahashi

Kenji Tanaka

Shigeki Kuze

Harutomo Ikeda

Yoshikatsu Seino

Masahiro Takahashi

Kunio Arai

Kouji Takane

Asami Koga

Kouichi Suga

Katsuhisa Yamaguchi

Hiroshi Kimbara

Tomonobu Takada

Jun Yamashita

Nobuhide Tanino

A grease composition may be used for speed reducers and speed increasers, being excellent in both torque transmission efficiency and leak prevention performance. The grease composition may contain a base oil (A) and a urea-based thickener (B), which is used for speed reducers and speed increasers, wherein the particles containing the urea-based thickener (B) in the grease composition satisfy the following requirement (I). Requirement (I): the area-based arithmetic average particle diameter of the particles is 2.0 &#x3bc;m or less, as measured by a laser diffraction/scattering method.

Grease composition

The present invention relates to a grease composition which can impart excellent durability to a bearing used under a high-speed rotation condition with a DN value of 100,000 or more, wherein the grease composition contains a base oil (A) and a urea-based thickener (B), and particles containing the urea-based thickener (B) in the grease composition satisfy requirement (I) that the particles have an arithmetic mean particle diameter of 2.0 &#x3bc;m or less on an area basis when measured by a laser diffraction scattering method. The grease composition is used for a bearing used under a high-speed rotation condition with a DN value of 100,000 or more.

The present invention relates to provision of an extreme pressure agent-containing grease composition using, as a thickener, a urea-based thickener, the grease composition being excellent in both torque transmitting efficiency and leakage prevention performance and also excellent in wear resistance and load resistance. The grease composition contains a base oil (A), a urea-based thickener (B), and an extreme pressure agent (C), wherein Requirement (I): an arithmetic average particle diameter of the particles on an area basis as measured by the laser diffraction/scattering method is 2.0 &#x3bc;m or less, and

Provided is a grease composition which is excellent in fire extinguishing performance without water and can suppress fuming, malodor, and liquefaction on burning and a method for producing the grease composition. A grease composition contains a base oil (A), a thickener (B), and a fire retardant (C), wherein the base oil (A) contains a base oil (A1) having a 40&#xb0; C. kinematic viscosity of 300 mm/s or more, a sulfur content of 20 ppm by mass or less, and an initial boiling point of 400&#xb0; C. or higher, the fire retardant (C) is at least one of aluminum hydroxide (C1) and 1,3,5-triazine-1,3,5 (2H, 4H, 6H)-tris(ethanol) (C2), and a content of the fire retardant (C) is 1.0 to 12.0 mass % based on a total amount of the grease composition.

Grease composition, method for manufacturing grease composition, and method for using grease composition

Provided is a mixed grease containing a grease (A) prepared from a base oil (a1) and a thickening agent (a2) that is a lithium soap consisting of a lithium salt of a monovalent fatty acid, and a grease (B) prepared from a base oil (b1) and a thickening agent (b2) that is a lithium complex soap consisting of a lithium salt of a monovalent fatty acid and a lithium salt of a divalent fatty acid. The mixed grease has good wear resistance and load bearing properties and has excellent grease leakage preventing properties.

Mixed grease

A powder metallurgy lubricant includes an aromatic carboxylic acid represented by a formula (1),(Z)n-Ar&#x2014;COOH&#x2003;&#x2003;(1)where Ar represents an aryl group and Z represents a substituent directly bonded to the above aryl group and is one of R, OR, OCOR and COOR, R representing one of an alkyl group, alkenyl group and alkynyl group and n being an integer in a range from 1 to 4. Z may be mutually the same or different when n is 2 or larger.

Metallurgical lubricant powder and metal powder composition

Provided is a lubricating oil composition for round die rolling, which is obtained by blending a base oil with: (A) 0.5 to 40 mass % of a monoester having 13 to 48 carbon atoms (a-1) and/or 0.5 to 30 mass % of a fatty dicarboxylate having 13 to 34 carbon atoms (a-2); (B) 0.01 to 10 mass % of a thiadiazole compound; (C) 0.01 to 15 mass % of a thiophosphite; and (D) 0.01 to 5 mass % of a triazole compound. The lubricating oil composition for round die rolling shows excellent processing performance without using any chlorine-based compound, and is able to improve lubricity in a bearing to lengthen the life of the bearing.

Lubricating oil composition for rolling with round die

A compound which satisfies requirements for the annealing property and the lubricating property simultaneously and a process for producing the compound are provided. The compound is an alkylacetal compound represented by the following general formula (1) or (2). In the general formulae, Rand Rrepresent hydrocarbon groups, Rto Rrepresent hydrogen atom or hydrocarbon groups, i and j represent integers satisfying the relation that the sum of the integers is 8 to 98, and k represents 0 or 1. 

Alkyl acetal compound, process for producing the same, and lubricating oil composition

Processes for producing polycarbonate by solid phase polymerization which simplify the crytallization to be conducted prior to the solid phase polymerization to thereby permit further shortening in the treatment time. A process for producing polycarbonate is characterized in that an amorphous polycarbonate prepolymer prepared by transesterification of aromatic dihydroxy compound with a diester of carbonic acid is prepolymerized in a solid phase under an atmosphere containing gaseous swollen solvent while the prepolymer is kept in a fluid state. Another process for producing polycarbonate is characterized in that a mixture comprising an amorphous polycarbonate prepolymer prepared by transesterification of an aromatic dihydroxy compound with a diester of carbonic acid and a polycarbonate prepolymer which has undergone crystallization is prepolymerized in a solid phase under an atmosphere containing a gaseous swollen solvent.

Processes for the production of polycarbonate

Process for producing polycarbonates

Method for producing granular polycarbonate prepolymer for solid-state

Process for producing polycarbonate

The present invention relates to a process for inexpensively and effectively recovering a high-purity organic acid, according to which a crude organic acid is subjected to extraction treatment with an organic solvent to obtain an organic solvent extract containing an organic acid; the organic solvent extract is mixed with a high-pressure gas to precipitate and separate impurities thereby obtaining a solution containing a high-purity organic acid; and the organic acid is separated from the solution to obtain a high-purity organic acid.

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Chiba, Japan

Akihiro Shishikura