METHOD FOR PRODUCING LIGNOCELLULOSE MATERIALS

The present invention relates to a novel and improved， batchwise or continuous， preferably continuous， process for producing single-layer or multilayer lignocellulose materials， comprising the process steps of * (Ia) producing a mixture M1 and * (Ib) optionally one or more mixture(s) M2， * (II) scattering mixture M1 and any mixture(s) M2 to give a mat， * (III) optionally precompacting the scattered mat and * (IV) hot pressing，in that mixture M1 comprises the lignocellulose particles (component LCP-1) and additionally * a) 0.005% to 0.5% by weight of organic carboxylic acid， carboxylic anhydride， carbonyl chloride or mixtures thereof (component A) * b) 0.05% to 3% by weight of organic isocyanates having at least two isocyanate groups (component B) and * c) 5% to 15% by weight of binder selected from the group of the amino resins (component C) * d) 0% to 2% by weight of hardener (component D) and * e) 0% to 5% by weight of additive (component E)，and mixture(s) M2 comprise(s) the lignocellulose particles (component LCP-2) and additionally * f) 0% to 0.3% by weight of organic carboxylic acid， carboxylic anhydride， carbonyl chloride or mixtures thereof (component F)， * g) 1% to 30% by weight of binder selected from the group consisting of amino resin， phenolic resin， protein-based binder and other polymer-based binders or mixtures thereof (component G-1) and 0% to 3% by weight of organic isocyanate having at least two isocyanate groups (component G-2)， * h) 0% to 2% by weight of hardener (component H) and * i) 0% to 5% by weight of additives (component I)，with the proviso that the following conditions are fulfilled: a min<a<amax and a min=[(??1/6000·T)+(65/6000)1， preferably amin=[(??1/4500·T)+(65/4500)]， more preferably amin=[(??1/3500·T]+(65/3500)]and a max=[(??1/2000·T)+(75/2000)]， preferably amax=[(??1/2500·T)+(75/2500)]， more preferably amax=[(??1/3000·T)+(75/3000)]， * where * T is the temperature of mixture M1 in ° C. after process step (Ia) and is between 10 and 65° C.， preferably 12 and 62° C.， more preferably 15 to 60° C.， and * a is the amount of acid equivalents in component A) in relation to the mass of component C) in mol/100 g.