Bayer MaterialScience has developed a bio-based hardener for PU coatings and adhesives under the brand Desmodur® eco N 7300, which is formulated with pentamethylene diisocyanate (PDI). PDI is a bio-based alternative to petrochemical-based hexamethylene diisocyanate (HDI), which is used in the production of polyurethanes.
Bayer’s development means that PU coatings can now be formulated entirely from bio-based materials using renewable-based polyols, cross-linkers and PDI. A large proportion of the carbon content – 70% – 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.
This is music to the ears of carmakers which are looking for bio-based replacements of petro-chemical coatings and paints to green their cars.
Desmodur® eco N 7300 is reportedly on par with conventional, petrochemical-based hardeners and brings advantages in terms of compatibility with coating and adhesive formulations.
Bayer MaterialScience is currently developing a comprehensive technology platform for additional uses of PDI-based raw materials in coatings, adhesives and other applications. Commercial production of Desmodur® eco N 7300 is due to begin following mandatory REACH registration.
A total annual capacity of up to 20 ktpa is to be provided at existing plants.
Bayer MaterialScience said its PDI precursor suppliers are working on next generation of biomass such as using cellulose or biowaste.
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