도쿠야마 (Tokuyama) 

Tokuyama Corporation produces and sells various chemical products in Japan. It operates through Chemicals, Cement, Advanced Electronic Materials, Life Science, Environmental Business, and Others segments. The Chemicals segment offers caustic soda, soda ash, calcium chloride, sodium silicate cullet, sodium bicarbonate, purifeed, vinyl chloride monomer, polyvinyl chloride resin, propylene oxide, methylene chloride, polyrotaxanes, and chloroform. Its Cement segment provides cement, ready-mixed concrete as well as engages in the recycling and environment business. The Advanced Electronic Materials segment provides polycrystalline silicon; fumed silica and tetrachlorosilane; aluminum nitride; high-purity chemicals for electronics manufacturing and photoresist developer; and isopropyl alcohol. Its Life Science segment provides medical diagnosis systems, dental materials and photochromic materials, advanced pharmaceutical ingredients and intermediates, health foods, plastic lens-related materials for glasses, and microporous film. The Environment Business segment offers plastic window sashes, ion exchange membranes, as well as engages in waste gypsum board recycling activity. The company was formerly known as Tokuyama Soda Co., Ltd. and changed its name to Tokuyama Corporation in April 1994. Tokuyama Corporation was incorporated in 1918 and is headquartered in Tokyo, Japan.