Method for producing a polyisocyanate from biomass

The present invention provides a method for preparing a polyisocyanate from natural sources sources, one per at least one hydroxy group or a low molecular weight aromatic containing at least one alkoxy group molecule (oxy aromatic) component composition containing is generated from the biomass material, these oxy aromatics are converted to the corresponding aromatic amines, after condensation with formaldehyde optionally by further reaction with phosgene, a compound containing an isocyanate group relates to a method is obtained.