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Tosoh Corporation was honored with the Encouragement Award at the 23rd Green Sustainable Chemistry (GSC) Awards held by the Japan Association for Chemical Innovation (JACI)’s Green Sustainable Chemistry Network (GSCN) at the JACI GSCN Conference. Tosoh received the accolade for its innovative low-temperature curing blocked isocyanate.
Blocked isocyanates, where the isocyanate (-N=C=O) groups are protected by blocking agents, serve as curing agents for polyurethane coatings. These blocking agents dissociate at high heat to initiate the curing reaction. This facilitates unlimited pot life and coating workability.1
The global trend of decarbonization, however, has heightened calls to reduce the energy required to heat the blocking agents in the process of curing polyurethane coatings and thereby lower CO2 emissions. Consequently, demand is rising for blocked isocyanates that cure at low temperatures. Lower temperatures, though, typically mean that the curing reaction progresses at room temperature which limits the pot life.
Tosoh is addressing these challenges with a focus on the dissociation catalysts of blocking agents and has identified a combination of temperature-sensitive amine catalysts and blocking agents.2 This led to Tosoh’s development of a low-temperature curing blocked isocyanate that cures at 80°C. Tosoh is developing applications for this technological innovation in automotive coatings, which need to transition to environmentally friendly processes, and for such low heat resistance materials as wood and plastic.
The GSC Encouragement Award, presented for achievements expected to contribute significantly to GSC, rewards Tosoh for what it has achieved and galvanizes Tosoh to achieve yet more. Tosoh takes inspiration from this award to continue its research and development of products and technologies meant to contribute to a carbon-neutral society.
1. Pot life is the time available for application after mixing the main and curing agents in coatings and adhesives.
2.Temperature-sensitive refers to a sudden increase in reactivity beyond a certain temperature to cause a change in a material’s characteristics.
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