PRESS RELEASE

Tosoh to Expand Production Capacity to Meet Growing Demand for High-Performance Paint Hardeners

Tosoh Corporation plans to increase its production capacity for hexamethylene diisocyanate (HDI) derivatives at its Nanyo Complex in Shunan City, Yamaguchi Prefecture. The company markets its HDI derivatives under the Coronate brand.

HDI derivatives are advanced functional polyurethanes widely used as paint hardeners and are integral products in the company’s Specialty business portfolio. They are valued for their superb resistance to yellowing and weathering, which makes them essential as high-performance hardeners in automotive and architectural exterior coatings.

Tosoh’s expansion of its production capacity for HDI derivatives responds to the robust growth of the global coatings market, propelled by steady demand in developed economies, increasing demand in emerging markets amid heightened motorization, and rising demand in worldwide markets amid elevated infrastructure investments. Industry projections indicate growing demand for HDI derivatives.

The increase to HDI derivatives production capacity is thus a strategic move by Tosoh to position itself to capitalize on growing demand for and to ensure the stable supply of HDI derivatives. The company intends to significantly expand the scale of its business in HDI derivatives to increase corporate profitability. Tosoh, meanwhile, is committed to meeting the evolving needs of its customers and thus contributes to advancements in coating technologies for diverse industries.


HDI derivatives plant

HDI Derivates Production Capacity Expansion Details

Location	Nanyo Complex
Facilities	HDI derivatives production facilities
Production capacity after expansion	30,000 metric tons a year (50% increase over current capacity)
Investment	Approximately ¥6 billion
Start of expansion	May 2025
Start of commercial operation	From August 2026

TOSOH CORPORATION
Who We Are

Tosoh Corporation is the parent of the Tosoh Group, which comprises over 100 companies worldwide and a multiethnic workforce of over 14,000 people. It generated net sales of ¥1,005.6 billion (US$7.0billion at the average rate of ¥144.6 to the US dollar) in fiscal 2024, ended March 31, 2024.

What We Do

Tosoh is one of the largest chlor-alkali manufacturers in Asia. The Company supplies the plastic resins and an array of the basic chemicals that support modern life. Tosoh’s petrochemical operations supply ethylene, polyethylene, and functional polymers, while its advanced materials business serves the global semiconductor, display, and solar industries. Tosoh has also pioneered sophisticated bioscience systems that are used for the monitoring of life-threatening diseases. In addition, Tosoh demonstrates its commitment to a sustainable future in part by manufacturing a variety of eco-products.

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