Polyisocyanate composition used for binding lignocellulosic materials

A process for binding lignocellulosic material comprising the steps of a) bringing lignocellulosic material into contact with a polyisocyanate composition and b) subsequently allowing said material to bind characterised in that the polyisocyanate composition comprises a methylene bridged polyphenyl polyisocyanate composition having a content of difunctional diphenylmethane diisocyanate isomers between 50 and 70 wt %, preferably between 55 and 70 wt % and more preferably between 60 and 70 wt %.