Japanese
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| March 1983 | Tomen Chemical Osaka establishes an independent company in Osaka and Nagoya. |
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| March 1984 | Tomen Chemical establishes an independent company in Tokyo. |
| October 1995 | Tomen Chemical establishes a branch in Niigata. |
| April 1998 | Tomen Chemical and Tomen Chemical Osaka merge, with the resulting company being known as Tomen Chemical. |
| July 1999 | Acquisition of ISO14001 certification. |
| April 2003 | Tomen absorbs Tomen Chemical and set up Tomen Chemical Company as a division of Chemicals and Plastics Segment. |
| March 2006 | Tomen Chemical spin off from Tomen as an independent company. |
| April 2006 | It becomes a part of the Toyota Tsusho Corporation group, following the following the merger of Toyota Tsusho Corporation and Tomen in April 2006. |