Tosoh Corp. decided to acquire all shares of Nanyo Kasei Co., a 50-50 joint venture with Asahi Kasei Corp., according to a report dated October 14, 2026.
The deal will make Nanyo Kasei a wholly owned subsidiary of Tosoh. Nanyo Kasei manufactures hexamethylene diisocyanate (HDI) monomer.
Currently, Tosoh and Asahi Kasei both supply raw materials and other inputs to Nanyo Kasei. Full ownership is expected to secure supply for Tosoh's new plant.
The transaction was listed in Chemical Engineering's November 2026 mergers and acquisitions roundup. Financial terms were not disclosed in the report.
