Daikin Industries, Ltd.

Daikin Kogyo Co., Ltd.

Satoshi Koyama

Satoshi Komatsu

Kazuo Okamura

Hirokazu Aoyama

Takehide Tsuda

Takashi Shibanuma

Yoshinori Tanaka

Yukio Homoto

Hideki Aomi

Ikuo Kitamura

Katsushi Tokunaga

Yoshio Iwai

Tadayuki Maeda

Takeo Matsumoto

Naoki Esaka

Yoshiyuki Shibuya

Tatsuo Nakada

Eiji Seki

Hideya Saito

Satoru Kono

Tetsuya Higuchi

Nobuyoshi Iwashita

Shiego Daimon

Takashi Kanemura

Takashi Yasuhara

Satoshi Tokuno

Satoru Kohno

Kunitada Tanaka

Koichi Kitazawa

Souichi Ueda

Tutomu Kamihigoshi

Utako Endo

Tomoji Kawai

A vulcanizable fluorine-containing elastomer composition having excellent stability in molding and kneading property, from which a vulcanized article having a small compression set can be produced in a short period of time. The vulcanizable fluorine-containing elastomer composition comprises a vulcanization agent, a vulcanization aid and a fluorine-containing elastomer having C&#x2014;H bond in its polymer chain, and an optimum vulcanization time T(min) of the composition and a compression set CS (%) of the vulcanized article satisfy the following equations (I) and (II):

Vulcanizable flouroelastomer composition

A process for preparing a fluoropolymer by polymerizing one or more radically polymerizable monomers comprising at least one fluoroolefin monomer in the presence of a radical polymerization initiator and as case demands, an inactive fluorocarbon and chain transfer agent in a reaction field where at least one of components forming the reaction field is in a supercritical state. According to the preparation process, generation of unstable end groups of the polymer, a decrease in a purity and complicated post-treatment can be eliminated.

Process for producing fluoropolymer

Hydrogen fluoride is effectively removed from a mixture of hydrogen fluoride, dichloromethane, chlorofluoromethane and/or difluoromethane by distilling the mixture so that two-component azeotropic mixtures of hydrogen fluoride and dichloromethane, hydrogen fluoride and chlorofluoromethane and hydrogen fluoride and difluoromethane are removed, or by liquid-separating the mixture into an upper liquid phase rich in hydrogen fluoride and a lower liquid phase not rich in hydrogen fluoride before each liquid phase is distilled as described above.

Process for removal of hydrogen fluoride

A fluorination catalyst comprising chromium oxide having a specific surface area of from 170 m /g to 300 m /g, which can catalyze the fluorination of a halogenated hydro-carbon with hydrogen fluoride and has a high activity and a long catalyst life.

Fluorination catalyst and process for fluorinating halogenated hydrocarbon

A fluorination catalyst comprising chromium oxide having a specific surface area of from 170 m,/g to 300 m,/g, which can catalyze the fluorination of a halogenated hydrocarbon with hydrogen fluoride and has a high activity and a long catalyst life.

A halogenated hydrocarbon is effectively fluorinated by reacting the halogenated hydrocarbon with hydrogen fluoride in the presence of a fluorination catalyst which comprises a partially fluorinated chromium oxide containing at least one metal selected from the group consisting of ruthenium and platinum.

Process for fluorinating halogenated hydrocarbon

Method for preparing halogenated butene and butane

A method for preparing a fluorination catalyst is disclosed, wherein the catalyst contains chromium oxide, has a specific surface area of from 170 m.sup.2 g to 300 m.sup.2 /g, catalyzes the fluorination of a halogenated hydrocarbon with hydrogen fluoride, and has a high activity and long catalyst life. The method includes mixing an aqueous solution of a chromium salt with aqueous ammonia to precipitate chromium hydroxide, drying the precipitated chromium hydroxide, sintering the dried chromium hydroxide, and fluorinating the sintered chromium hydroxide to obtain the chromium oxide catalyst.

Method for preparing fluorination catalyst used to fluorinate

Method for producing difluoromethane and 1,1,1,2-tetrafluoroethane

Method for preparing dichlorodecafluoropentane and decafluoropentane

Azeotropes of hydrogen fluoride with dichloromethane, difluoromethane

In a process for preparing 1,1,1-trifluorochloroethane by reacting, in a gas phase, trichloroethylene and hydrogen fluoride, when the reactant gases are diluted with a gas which is inactive to the reaction, it is very easy to control a reaction temperature, and when a generated gas from the reaction of 1,1,1-trifluorochloroethane and hydrogen fluoride is used as a diluent gas, generation of 1,1-difluoroethylene is suppressed to a very low level while not influencing the reaction between trichloroethylene and hydrogen fluoride.

Process for preparing 1,1,1,2-tetrafluoroethane

Process for preparing 1,1-dichloro-2,2,2-trifluoroethane

Process for preparing 1,1,1-trifluoro-2-chloroethane and/or

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Osaka, Japan

Satoshi Koyama