What factors are driving raw material development for polyurethane coatings? Markus Dimmers: We are developing more and more bio-based polyurethane dispersions with the focus on them performing as well as the petrochemical alternative. In many cases, however, the performance of such bio-based PUDs can even exceed those of existing products. To what extent can formulators increase the sustainability of these coatings and reduce their carbon footprint? Dimmers: Formulators are not yet using many bio-based products.