A state leather maker in Yantai became the world's largest MDI producer

Wanhua started in 1978 as a state-owned synthetic-leather producer that Beijing ordered to make methylene diphenyl diisocyanate (MDI), a polyurethane raw material China could not make. It licensed a process from Nippon Polyurethane (later part of Tosoh), but the contract only supplied equipment and help building a 10,000-tonne plant in Yantai. It did not include ongoing operational support.

The plant opened in 1983 but did not run at full capacity until 1995, because Wanhua's engineers had to make the licensed equipment work by themselves. It was a loss-maker making poor-quality MDI. President Zengtai Liao, who joined as a plant engineer, said the setback forced the company into R&D when most Chinese firms were not doing any: "We were loss-making, our MDI was of poor quality, so we had no choice."

Wanhua kept its own engineers, raised the original plant's output to 220,000 tonnes a year before closing it in 2014, and built a proprietary MDI process that has never been challenged for patent infringement. It opened the world's largest single-train MDI plant in Ningbo with 800,000 tonnes of capacity, and in 2011 bought Hungarian producer BorsodChem for $1.7 billion to get a European foothold.

By 2011, after upgrades in Yantai and Ningbo, Wanhua became the world's largest MDI producer. Its 2015 sales were close to $3 billion, and it began widening into aliphatic isocyanates and polycarbonate, products that only a handful of Western firms had mastered. C&EN noted it was a rare Chinese company to go from obscurity to a world player in chemicals.

Became the world's largest producer of MDI by 2011 with 1.2 million metric tons of capacity, and 1.8 million by 2014.

The licensing contract did not give operational know-how, so engineers had to run the plant themselves.

Management chose to keep funding in-house R&D rather than buy fully-bundled foreign technology.

A proprietary MDI process gave Wanhua patent-protected cost and quality advantages.

Domestic demand from shoes and insulation and a willingness to buy foreign assets (BorsodChem) let it scale globally.

When a supplier withholds the know-how, the unfunded research you are forced into can become the moat — if leadership lets a loss-making plant keep trying.

Wanhua is the world's largest MDI producer, with capacity scaled to 1.8 million metric tonnes by 2014 and a major plant planned on the U.S. Gulf Coast. It diversified into polycarbonate, isophorone diisocyanate and propane-dehydrogenation to reduce its dependence on China and on MDI. Profit fell 29% in 2015 as MDI prices and the Chinese economy slowed, and Moody's flagged rising short-term debt, pushing it to broaden its portfolio.