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| Feb. 1918 |
Established "Nihon Soda Kogyo Co., Ltd." to produce soda ash in Tokuyama, Yamaguchi Prefecture (currently Shunan City). |
| Jan. 1936 |
The Company name is changed to "Tokuyama Soda Co., Ltd." |
| Mar. 1938 |
Commenced cement business. Established new plant for the manufacture of portland cement. |
| Aug. 1939 |
Established basic magnesium carbonate plant with the aim of expanding inorganic chemical business |
| Mar. 1952 |
Commenced electrolytic chlor-alkali productions |
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| Dec. 1960 |
Completed construction of Nanyo plant in Nanyo, Yamaguchi Prefecture(currently Shunan City) with the aim of expanding cement business |
| July 1964 |
Commenced petrochemicals activities with the establishment of a propylene oxide plant |
| Sept. 1964 |
Established ethylene dichloride (EDC) plant |
| Sept. 1966 |
Commenced polyvinyl chloride business with the establishment of a manufacturing subsidiary |
| Mar. 1967 |
Commenced ion exchange membrane business with the establishment of a manufacturing plant |
| June 1967 |
Completed construction of Higashi plant in Tokuyama, Yamaguchi Prefecture (currently Shunan City) with the aim of expanding the petrochemical business |
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| Mar. 1970 |
Commenced polypropylene (PP) business with the establishment of a plant |
| July 1972 |
Established isopropyl alcohol (IPA) plant |
| Jan. 1976 |
Commenced polypropylene film operations with the establishment of a plant |
| Mar. 1978 |
Entered the dental materials field with the establishment of Towa Giken Co., Ltd., a manufacturing and sales company |
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| Sept. 1980 |
Completed construction of the Fujisawa Research Laboratory in Kanagawa |
| Dec. 1980 |
Commenced building material operations with the establishment of a plant in Hokkaido and the launch of "Shanon Window," a plastic window sash |
| Apr. 1982 |
Entered the household toiletries market with the release of household moisture absorbent products |
| Aug. 1982 |
Entered the fine chemicals market with the sale of plastic lens materials |
| Aug. 1983 |
Commenced electronic chemicals business with the sale of high purity chemicals for electronics industry use |
| July 1984 |
Commenced production of high purity polycrystalline silicon with the establishment of a plant |
| Apr. 1985 |
Commenced aluminum nitride (AlN) business with the establishment of a plant |
| Apr. 1985 |
Completed construction of Kashima Factory in Hasaki, Ibaraki Prefecture (currently Kamisu city) with the aim of expanding the fine chemicals business |
| Apr. 1985 |
Commenced business in the diagnostic system market |
| Dec. 1985 |
Entered the sensor business with equity participation in Figaro Engineering Inc., a manufacturer of semiconductor type gas sensors |
| Aug. 1986 |
Established a new plant in Kashima Factory for the manufacture of pharmaceutical and agricultural chemical intermediates |
| Apr. 1988 |
Established the joint-venture company A&T Corporation to launch clinical diagnostic system operations |
| June 1988 |
Established Pornpat Chemicals Co., Ltd., a joint-venture company, in Thailand to produce precipitated silica (changed the name to Tokuyama Siam Silica Co., Ltd. in May 2004) |
| May 1989 |
Completed construction of the Tsukuba Research Laboratory in Tsukuba, Ibaraki Prefecture |
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| Apr. 1994 |
The company name is changed to "Tokuyama Corporation" |
| July 1995 |
Established Shin Dai-ichi Vinyl Corporation to consolidate Tokuyama's polyvinyl chloride business |
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| Apr. 2000 |
Established Sun • Tox Co., Ltd., a manufacturing and sales company, to consolidate film operations.
Established Shanon Corporation to consolidate plastic sashes business (changed the name to Excel Shanon Corporation in October 2008) |
| Aug. 2000 |
Commenced the recycling & environment business |
| Oct. 2000 |
Spun off the household toiletries business to Tokuyama Home Products Co., Ltd. (transferred to Okamoto Industries Inc. in April 2004) |
| Apr. 2001 |
Established Tokuyama Polypropylene Co., Ltd., a joint-venture manufacturing company with Idemitsu Petrochemical Co., Ltd. (later renamed Prime Polymer Co., Ltd.) |
| Apr. 2001 |
Established Yamaguchi Eco-Tech Corp., a joint-venture company with Ube Industries, Ltd., to recycle municipal waste-incineration ash for reuse as cement materials |
| July 2001 |
Transferred the polypropylene business to Idemitsu Petrochemical Co., Ltd. (later renamed Prime Polymer Co., Ltd.) |
| Oct. 2001 |
Established Tokuyama Dental Corp. to consolidate the dental materials operation |
| Dec. 2001 |
Acquired Clariant Tokuyama Ltd., a J/V manufacturer of detergent builder, and reorganized as Tokuyama Siltech Co., Ltd., a wholly owned subsidiary |
| Apr. 2002 |
With the aim of a functional complete integration covering from planning through development, manufacturing and sales, the operating system was newly reorganized as four business divisions of Cement, Chemicals, Si and Advanced Materials, as well as four corporate divisions of Corporate Adminstration, Manufacturing Technology, Research & Development and General & Personnel Affairs. |
| Sept. 2002 |
Established Shanghai Tokuyama Plastics Co., Ltd. in Shanghai, China as a manufacturing and sales company of microporous film |
| Jan. 2003 |
Spun off the Information System Group and established Tokuyama Information Service Corp. heralding a new era of Group shared services |
| Jan. 2004 |
Established ASTOM Corp., a manufacturing and sales company, to consolidate the ion exchange membranes business |
| Sept. 2005 |
Established Tokuyama Chemicals (Zhejiang) Co., Ltd. in Zhejiang, China as a manufacturing and sales company of fumed silica |
| Sept. 2005 |
Established Tokuyama Trading (Shanghai) Co., Ltd., a sales company, in Shanghai, China |
| Nov. 2006 |
Established the joint-venture company Tokuyama Electronic Materials (Suzhou) Co., Ltd. in Jiangsu, China to produce and sell high purity chemicals for electronics manufacturing
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| Feb. 2007 |
Established the joint-venture company Tokuyama-Dowa Power Material Co., Ltd. to manufacture aluminum nitride substrates |
| Jan. 2008 |
Established Tokuyama Korea Co., Ltd., a sales company, in Seoul, Korea |
| Aug. 2008 |
Established Shunan Bulk Terminal Co., Ltd. a joint-venture company, to make the physical distribution of coal more efficient in the Shunan region |
| Oct. 2008 |
Established Excel Shanon Corporation to consolidate plastic window sash business |
| Aug. 2009 |
Established Tokuyama Malaysia Sdn. Bhd. in Malaysia as a manufacturing and sales company of polycrystalline Silicon |
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| Apr. 2010 |
Established the Specialty Products Business Division to consolidate the Si Business Division and the Advanced Materials Business Division |
| Apr. 2011 |
Introduced an executive officer system
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| Jun. 2011 |
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Established Tianjin Tokuyama Plastics Co., Ltd. in Tianjin, China as a manufacturing and sales company of microporous film
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