Tosoh Corporation celebrates more than 70 years of serving customers.  Here we list some of the highlights of Tosoh's distinguished history.
 
1935
Founding of Toyo Soda Manufacturing Co., Ltd.

1964
Opening of New York office (later became Tosoh USA, Inc. in 1979)

1968
Shin-Daikyowa Co., Ltd. established

1971
Operation of Yokkaichi Manufacturing Complex began

1975
Tekkosha Co., Ltd. was merged into Toyo Soda Manufacturing
Electrolytic manganese dioxide production begins in Greece at Tosoh Hellas A.I.C. (formerly Tekkosha Hellas A.B.E.)

1976
PVC production in Indonesia begins (P.T. Standard Toyo Polymer) Founding of Amto International trading company in Amsterdam (later became Tosoh Europe B.V. in 1987)

1978
Ethylene amine production in the Netherlands (Delamine B.V.) begins Shin-Daikyowa merges with Chubu Chemical Co., and acquires styrene monomer plant

1979
Tosoh USA, Inc. established

1983
Tohoku Toso Chemical Co., Ltd. established

1985
Toso Electronics Co., Ltd. established, sputtered hard disk production begins

1986
PPS production begins at Tosoh Susteel

1987
Company name changed to Tosoh Corporation
U.S. joint venture firm TosoHaas established for sale of chromatography materials and Aspartame plant in the Netherlands (Holland Sweetener Company) completed

1988
Acquisition of Specialty Metals Division of Varian Associates now Tosoh SMD, Inc.
Tosoh acquires equity interest in Industrial Resins (Malaysia) Sdn. Bhd.

1989
Founding of Tosoh America, Inc.
Establishment of Tosoh Medics, Inc.
Ownership of NSG USA, Inc. transferred to Tosoh
Equity participation in Weiss Scientific Glass Blowing Co., Inc.

1990
Tosoh/Shin-Daikyowa merger
Tosoh Belgium established
Equity participation in Eurogenetics

1992
Establishment of Nippon Silica Glass Europe
Equity participation in General Chemical (Soda Ash) Company

1993
Tosoh SMD completed a new focused factory
Holland Sweetener Company quadrupled the capacity of their
aspartame plant

1994
Holland Sweetener Company quadrupled the capacity of their aspartame plant
Acquisition of outstanding equity in Eurogenetics N.V., now Tosoh Bioscience, N.V.
Establishment of Philippine Resins Industries, Inc., a joint venture company of Tosoh, Mitsubishi Corporation, Bank of the Philippine Islands and Mabuhay Vinyl Corporation

1995
Tosoh SMD Korea, Ltd. established
P.T. Satomo Indovyl Polymer established
Acquisition of Cryco Quartz, Inc. and Cryco Twenty-Two, Inc.

1996
Tosoh SMD Singapore Pte. Ltd. established
Equity participation in Taiyo Vinyl Corporation
Completion of Tosoh's second VCM plant
Opening of NSG Europe's factory in England

1997
Establishment of Tosoh SMD Taiwan, Ltd.
Establishment of Tosoh Asia Pte. Ltd.

1998
Tosoh America relocates to Ohio.

2000
Aqcuired:
100% interest in Nippon Silica Glass Co., Ltd., now Tosoh Silica Corporation
100% interest in Tosoh Akzo, now Tosoh Finechem, now Tosoh Finechem. 
Remaining 50% from Rohm and Haas in TosoHaas, now wholly owned Tosoh Bioscience. 
Tosoh SET, Inc.

2001
Acquires remaining 50% stake in F-TECH, now Tosoh F-TECH
Tosoh Quartz Group opens processing plant in Taiwan
Tosoh & Hodogaya Chemical Acquire 100% Interest in Nippon Polyurethane Industry

2002
Tosoh subsidiary acquires PVC business from Kureha Chemical
Invests JPY2.5 billion in new TBA plant and infrastructure

2003
Establishes Trading Company in China (Tosoh Shanghai Trading)
All bioscience companies worldwide are united under the new brand, "Tosoh Bioscience"
Nippon Silica Industrial Becomes Wholly Owned Subsidiary

2004
Investment in China will make Tosoh largest VCM player in Asia (JPY 47 billion investment in multinational integrated operations)

2005
Tosoh Corporation celebrates 70th anniversary!

2006
Tosoh Corporation announces that it will raise its stake in Nippon Polyurethane Industry Co. Ltd. (NPU) to 51%.  The move is part of a billion dollar investment to strengthen Tosoh’s vinyl-isocyanate infrastracture and establish a more competitive presence in the rapidly expanding polyurethane industry of Asia and especially China.

2007
Production initiated at Tosoh (Guangzhou) Chemical Industries, Inc., Tosoh's vinyl chloride resin manufacturing and sales company in Guangzhou, China.
(220,000 tons per year)

2008
Tosoh Group crosses the US$8 billion mark with sales of ¥827 billion for fiscal 2007.

2010
Tosoh celebrates its 75th year in business with the opening of five new plants and continued rapid expansion in China.