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Tosoh Corporation was established as Toyo Soda Manufacturing Co., Ltd., in Yamaguchi Prefecture, Japan in 1935 as a domestic producer of caustic soda and soda ash. In 1975, the company merged with Tekkosha Co., Ltd., the first PVC manufacturer in Japan. The company was renamed Tosoh Corporation in 1987. In 1990, Tosoh merged with Shin-Daikyowa Petrochemical Co., Ltd., one of Japan's olefin manufacturers and owner of ethylene cracker facilities. Today, Tosoh is one of the largest chlor-alkali and VCM producers in the world. It currently manufactures various chemicals including olefins, polymers, polyurethane, chlor-alkali, cement, organic chemicals, in vitro diagnostics and separation and purification instruments and reagents, and advanced materials (zirconia powders and grinding media, sputtering targets, quartz materials, and battery materials).
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