Sumitomo Seika Chemicals Co., Ltd.

The Japan Carlit Co., Ltd.

Takehiro Hiyama

Takeshi Takeuchi

Hirokazu Kagano

Michio Suzuki

Seiji Bando

Takeshi Fujiwara

Hiroyuki Shiraishi

Ichiro Fuseya

Hitoshi Karino

Kazumi Chiba

Hideaki Nishiguchi

Hidehiko Myoken

Shinya Murakami

Shinji Nii

Toshihiko Kanki

Chun Li

Ichiro Yokoe

Youji Yamaguchi

Kazato Yanada

Provided is an additive for rubber that contains a sulfide composition, wherein the sulfide composition in the additive for rubber contains a sulfide compound having the repeating units shown by formula (1), the amount of repeating units (1) in which X=2 is at least 45 molar parts per 100 molar parts of repeating units (1) in the sulfide compound, and the number n of repeating units (1) in the sulfide compound is from 1 to 400, whereby an additive for rubber capable of imparting excellent heat resistance is provided. Also provided is a rubber composition that contains said additive for rubber. wherein X is 1, 2 or 3.

Additive for rubber

The present invention provides a method for producing 1,2-benzisothiazol-3-one compounds by reacting a 2-(alkylthio)benzonitrile compound with a halogenating agent in the presence of water, the method being characterized in that the reaction proceeds while the halogenating agent and water are gradually and simultaneously added to a reaction system containing the 2-(alkylthio)benzonitrile compound. The invention allows the simple and economical production of highly pure 1,2-benzisothiazol-3-one compounds, which are useful as antimicrobial agents, antifungal agents, etc.

1,2-benzisothiazol-3-one compound production method

The present invention provides a method for producing a methylene disulfonate compound including reacting, in the presence of an acid and a dehydrating agent, a formaldehyde compound with at least one salt of alkanedisulfonic acid selected from the group consisting of alkali metal salts of alkanedisulfonic acid and alkaline earth metal salts of alkanedisulfonic acid each represented by a specific formula. According to the method of the present invention, a methylene disulfonate compound can be obtained in a simple manner at low cost.

Method for producing a methylene disulfonate compound

It is an object of the present invention to provide an aprotic polar solvent mainly useful as a solvent for an electrochemical device, and having a comparatively low melting point and excellent thermal stability. The present invention is a sulfone compound represented by formula (1),  wherein, in formula (1), Rrepresents a C6-C8 branched-chain alkyl group.

Sulfone compound

The present invention provides a process for producing a methylene disulfonate compound in a simple manner at low cost. The present invention provides a process for producing a methylene disulfonate compound represented by General Formula (2) comprising:  

Process for production of methylene disulfonate compound

This invention is directed to a process for producing a bishalophenyl disulfide, chracterized by reacting a halothiophenol with an alkali metal hydroxide to obtain an alkali metal halothiophenolate and subsequently converting the halothiophenolate into a disulfide with an oxidizing agent in the presence of a mineral acid. By the process, a bishalophenyl disulfide having a high purity can be industrially produced in high yield.

Process for producing bishalophenyl disulfide

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Hyogo, Japan

Takehiro Hiyama