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 relative content of minor trifunctional isocyanate isomers of at least 17 wt % based on the total trifunctional isocyanate content.