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Ouchi Shinko Chemical Industrial Co., Ltd.

Japanese chemical manufacturer producing organic rubber chemicals, pharmaceutical active ingredients, fruit-tree antimicrobials, and environmental chemicals.

Last updated September 16, 2026

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Overview

Ouchi Shinko Chemical Industrial Co., Ltd. is a Japanese chemical company that manufactures and sells organic rubber chemicals, pharmaceutical active ingredients, fruit-tree antimicrobials, and environmental chemicals. It states it possesses technology to handle carbon disulfide safely. Its main product lines include vulcanization accelerators (Nocceler), antioxidants (Nocrac), vulcanizing agents (Vulnoc), peptizers (Noctizer), and antimicrobials (Thionock). The company traces its origins to 1918, when founder Ouchi Saimo opened the industrial chemicals business Ouchi Shoten, and was established under its current name in 1937. It operates plants including the Sukagawa Plant and the Haramachi Plant in Fukushima Prefecture, and has established joint ventures and local entities in China and Thailand.

History

The company's history traces to 1918, when founder Ouchi Saimo opened the industrial chemicals business Ouchi Shoten. In 1929 it was reorganized as the limited partnership Ouchi Saimo Shoten. In 1931 it established the Shinko Chemical Research Institute and began producing Japan's first domestically produced vulcanization accelerator. In 1932 it relocated to Itabashi Ward, Tokyo, was renamed Shinko Chemical Works, and began manufacturing various rubber chemicals (former Shimura Plant). In 1934 it succeeded in the domestic industrialization of organic photographic chemicals and began production. In 1937 it was renamed and Ouchi Shinko Chemical Industrial Co., Ltd. was established. In 1945 the Sukagawa Plant (Fukushima Prefecture) began operation, and production of anti-epidemic agents and agricultural chemicals also began. In 1953 it began manufacturing an anti-alcoholism agent as its pharmaceutical business. In 1961, commemorating the 30th anniversary of its founding, it completed an administration building and research facilities at the Shimura Plant. In 1966 it completed a new head office building in Nihonbashi Kobunacho, Chuo-ku, Tokyo, and relocated its head office there. In 1971 the Haramachi Plant (Fukushima Prefecture) began operation. In 1976 it increased its capital to 115 million yen. In 1982 the limited partnership was reorganized as Ouchi Saimo Shoten Co., Ltd. In 1983 the research division was reorganized as the Central Research Laboratory. In 1985 it established Prepac Co., Ltd. in Nihonmatsu City, Fukushima Prefecture. In 1995 it established the joint venture Changzhou Huadaming Chemical Co., Ltd. in China. In 2002 it established the joint venture Changzhou Shinko Huadaming Chemical Co., Ltd. in China. In 2003 it transferred the functions of the Shimura Plant and Central Research Laboratory to the Sukagawa Plant and renamed the Central Research Laboratory the Development Research Laboratory. In 2008 it established the local entity Shanghai Ouji Trading Co., Ltd. in China. In 2012 it established the joint venture OUCHI (THAILAND) CO., LTD. in the Kingdom of Thailand. In 2015 it built a new GMP-compliant mass-production pharmaceutical plant within the Sukagawa Plant site. In 2017 it built a multi-plant within the Haramachi Plant site.

Products and positioning

Pioneer of organic rubber chemicals in Japan, aiming to become a 100-year company.

  • Organic rubber chemicals

    Vulcanization accelerators, antioxidants, vulcanizing agents, peptizers, masterbatches

  • Pharmaceutical active ingredients

    Includes Epalrestat, Propiverine hydrochloride, Istradefylline, Candesartan cilexetil, Disulfiram, Arotinolol hydrochloride

  • Fruit-tree antimicrobials

    Thionock Flowable; based on thiram, registered as an agricultural chemical in 1954

  • Environmental chemicals

    Metal recovery/recycling chemicals and metal fixation (insolubilization) agents for wastewater and incinerator fly ash

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