| 1965 |
Toyo Soda Manufacturing Co., Ltd. (today's Tosoh) and US-based Stauffer Chemical Company jointly founded Toyo Stauffer Chemical Co., Ltd. |
| 1966 |
Started production of dicalcium phosphate. |
| 1967 |
Started production of titanium trichloride. |
| 1969 |
Started production of alkyl aluminums. |
| 1977 |
Started production of Solvay catalysts. |
| 1982 |
Started production of electronic grade metal alkyls (EGMA) |
| 1983 |
Started production after completion of highly active catalyst manufacturing facilities. |
| 1985 |
The business was reorganized as an incorporated company. |
| 1986 |
Completed manufacturing facilities for organic synthesis and started production of these new materials. |
| 1989 |
Name of the company changed to Tosoh Akzo Co., Ltd. |
| 1993 |
Obtained ISO-9001 certification |
| 2000 |
The company became a wholly owned subsidiary of Tosoh Corporation.A pharmaceutical products manufacturing license was obtained and the name was changed to Tosoh Finechem Corporation. |
| 2002 |
Obtained ISO-14001 certification |
