| abstract |
FIELD OF THE INVENTION The present invention relates to a process for preparing polyisocyanates from natural raw material sources, wherein compositions comprising low molecular weight aromatics (oxyaromatics) comprising one or more hydroxy groups or one or more alkoxy groups per molecule are prepared from biomass materials These oxyaromatics are converted to the corresponding aromatic amines, and optionally after condensation with formaldehyde, to further react with phosgene to give compounds comprising isocyanate groups. |