The present invention relates to a batchwise or continuous process for producing single-layer one multilayer lignocellulosic materials, comprising the process steps of (I) mixing the components of the individual layers, (II) scattering the mixture(s) produced in process step (I) to give a mat, (III) optionally precompacting the scattered mat and (IV) hot-pressing the optionally precompacted mat, by using, in process step (I), for the core of multilayer lignocellulosic materials or for single-layer lignocellulosic materials, a mixture (component A) comprising a1) 50% to 99% by weight, preferably 70% to 97% by weight, more preferably 80% to 95% by weight and especially 85% to 92% by weight of organic isocyanate having at least two isocyanate groups or mixtures thereof and a2) 1% to 50% by weight, preferably 3% to 30% by weight, more preferably 5% to 20% by weight and especially 8% to 15% by weight of organic carboxylic acid, carboxylic anhydride, carbonyl chloride or mixtures thereof and a3) 0% to 49% by weight, preferably 0% to 10% by weight and more preferably 0% to 5% by weight of auxiliaries or mixtures thereof.