Major global manufacturers and key market players associated with TODI (o‑tolidine diisocyanate / bitolylene diisocyanate, CAS 91‑97‑4) are:

A. Large integrated isocyanate / polyurethane players active in the TODI (bitolylene diisocyanate) segment

Market research on the global TODI (bitolylene diisocyanate) market consistently cites the following as major companies: (dataintelo.com)

- BASF SE (Germany)

- Covestro AG (Germany)

- Huntsman Corporation (USA)

- Dow Inc. (USA)

- Wanhua Chemical Group Co., Ltd. (China)

- Mitsui Chemicals, Inc. (Japan)

- Tosoh Corporation (Japan)

- Evonik Industries AG (Germany)

- Vencorex Holding SAS (France/Thailand)

- Perstorp Holding AB (Sweden)

- Asahi Kasei Corporation (Japan)

- Kumho Mitsui Chemicals Inc. (South Korea)

- OCI Nitrogen (Netherlands)

- Shandong INOV Polyurethane Co., Ltd. (China)

- Shanghai Lianheng Isocyanate Co., Ltd. (China)

These firms are broad-based polyurethane and isocyanate producers; TODI/bitolylene diisocyanate is typically part of their high‑performance diisocyanate or specialty isocyanate portfolio rather than a standalone flagship product.

B. Identified commercial TODI producers / brand owners

In addition to the large integrated players above, a few companies are directly visible in the market with a specific TODI product:

- Nippon Soda Co., Ltd. (Nisso) – Markets TODI (3,3'-Dimethyl‑4,4'-Biphenylene Diisocyanate) as a branded specialty isocyanate; NISSO CHEMICAL EUROPE GmbH distributes it in Europe. (buychemjapan.com)

- Chinese specialty / trading producers (often supplying under the TODI or o‑tolidine diisocyanate name), including:

- Chemport Science & Technology (Shanghai) Co., Ltd. (chinachemnet.com)

- Wuhan Silworld Chemical Co., Ltd. and other Chinese intermediates suppliers listed as TODI manufacturers. (chemicalbook.com)

C. Important practical point

- TODI is a niche, high‑performance diisocyanate (used in specialty polyurethanes, elastomers, high‑temperature applications). Installed capacity and exact volume by producer are not typically disclosed separately; most information comes from market‑research reports and product catalogues rather than official capacity announcements.

- The names above should therefore be treated as major commercial and market-recognised players, not as an exhaustive or ranked list of capacity.

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