Bayer MaterialScience has developed a bio-based hardener for polyurethane coatings and adhesives. Desmodur eco N 7300, based on pentamethylene diisocyanate, achieves the high level of conventional, petrochemical-based isocyanates and, in some cases, even surpasses it.
Seventy percent of the carbon content is biomass-based. The starting product is a starch from forage corn, a feed and industrial crop that is not intended for human consumption and does not compete directly with food production.
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