| 1929 |
Tokyo Cellophane Co., Ltd. established as a company to manufacture and distribute cellophane (capital : 100 thousand yen). |
| 1961 |
Listed stock on the second section of the Tokyo Stock Exchange. |
| 1961 |
Started manufacturing vinylon films at Hamamatsu Factory. |
| 1964 |
Started manufacturing cast polypropylene films at Tokyo Factory. |
| 1969 |
Tohcello Chemical Co., Ltd. established, started production of cast polypropylene films. |
| 1970 |
Established the Ibaraki Factory; started manufacturing cast polypropylene films and coating processing. |
| 1971 |
Increased capital to 1 billion yen; Mitsui Petrochemical Industries, Ltd. (current Mitsui Chemicals, Inc.) became top shareholder: started manufacturing oriented polypropylene films at the Ibaraki Factory. |
| 1972 |
Anjo Resin Co., Ltd. established for manufacturing foam sheets. |
| 1975 |
The Tokuyama Factory of Tokuyama Soda Co., Ltd. (currently known as Tokuyama Corporation) commercializes OPP films. |
| 1980 |
Seal and lining operations launched with establishment of Hi-Sheet Industries Ltd. |
| 1982 |
Started manufacturing polyethylene films at the Hamakita Factory. |
| 1990 |
Initiated the Hamakita Factory; started manufacturing metallized films. |
| 1992 |
Tokuyama Soda Co., Ltd. (currently known as Tokuyama Corporation) and Okura Industrial Co., Ltd. jointly invest capital to establish a film sales company named SunTox Co., Ltd. |
| 1993 |
Merged with Shin-Tohcello Shoji Co., Ltd. |
| 1994 |
The Kanto Plant commercializes multilayer extrusion films and puts CPP film machine No. 1 into commercial operation. |
| 1997 |
OPP film machine No. 5 and CPP film machine No. 2 commence commercial operation at the Kanto Plant. |
| 1999 |
SunTox Co., Ltd. acquires ISO 14001 certification as a member of Tokuyama Corporation's Tokuyama Factory site. |
| 2000 |
Manufacturing and sales operations in Japan are integrated into the joint venture SunTox Co., Ltd. |
| 2000 |
The first section of the Kanto Plant acquires ISO 9002 certification. |
| 2000 |
Merged with Tohcello Chemical Co., Ltd. and changed company name to Tohcello Co., Ltd. (capital : 2,370 million yen). |
| 2003 |
SunTox Co., Ltd. becomes a wholly owned subsidiary of Tokuyama Corporation. |
| 2003 |
The Tokuyama Plant acquires ISO 9001 certification. |
| 2003 |
The first section of the Kanto Plant acquires ISO 9001 certification. |
| 2004 |
The second section of the Kanto Plant acquires ISO 9001 certification. |
| 2005 |
Increased capital to 3.45 billion yen by public offering. |
| 2005 |
Mitsui Chemicals Fabro, Inc. established via a merger with Mitsui Kagaku Platech Co., Ltd. (including operations for household and personal care products, foam sheets, and Mitsui Masking Film). |
| 2006 |
Merged with Shikoku Tohcello Co., Ltd. |
| 2007 |
The Kanto Plant acquires ISO 14001 certification. |
| 2007 |
Consolidated Hamakita Factory and Hamamatsu Factory and renamed Hamamatsu Factory. |
| 2008 |
CPP film machine No. 3 commences commercial operation at the Kanto Plant. |
| 2008 |
Merged with a wholly-owned subsidiary Tohcello Pax Co.,Ltd. |
| 2009 |
Became a wholly owned subsidiary of MITSUI CHEMICALS, INC. through a share exchange. |
| 2010 |
SunTox Co., Ltd. acquires the ISO 9001 certification of its whole company. |
| 2010 |
Tohcello Co., Ltd. and Mitsui Chemicals Fabro Inc. (excluding its Household and Personal Care Products Division) integrate to form Mitsui Chemicals Tohcello, Inc. |
| 2012 |
Upgraded to business "sector" from a "division" of Mitsui Chemicals Inc,(MCI) to optimize and expand functional films/sheets business within MCI group. |
| 2012 |
Established Siam Tohcello Co., Ltd. (head office: Eastern Seaboard Industrial Estate(Rayong), Thailand)-joint venture company with SCG-Chemicals Co., Ltd. (head office: Bangkok, Thailand) to manufacture and sales of highly functional LLDPE Film (T.U.X™). |
| 2015 |
Rengo Co., Ltd. engages in capital participation in SunTox Co., Ltd. |
| 2016-04 |
Koga Works integrated into Ibaraki Works to strengthen competitiveness of packaging film business. |
| 2017 |
OPP film machine No. 6 commences commercial operation at the Kanto Plant. |
| 2020 |
SunTox Co., Ltd. becomes a consolidated subsidiary of Rengo Co., Ltd. after a change in shareholding ratios between Rengo Co., Ltd. and Tokuyama Corporation. |
| 2024-04-01 |
The packaging solutions business of Mitsui Chemicals Tohcello, Inc. and Sun Tox Co., Ltd., a subsidiary of Rengo Co., Ltd., will be integrated, and the new company will be named RM TOHCELLO CO., LTD. |
