Patent ID: 6287495
Filing Date: 2001-09-11
Classification: C08G,C08L

Abstract:
A process for the production of wood composite materials comprising:A) combining wood particles with 1 to 25% by weight, based on the total weight of the wood composite, of a thixotropic binder composition comprising:1) an isocyanate component selected from the group consisting of:(a) a polymethylene poly(phenylisocyanate) having an NCO group content of about 30 to 33%, and(b) a semi-prepolymer of polymethylene poly(phenylisocyanate) having an NCO group content of about 25 to 33%; and2) a thixotropic agent selected from the group consisting of:(a) a mineral species,(b) a rheological additive,(c) an adduct of(1) a polyisocyanate or a semi-prepolymer of a polyisocyanate, with(2) a compound selected from the group consisting of (i) a substituted aromatic diamine, (ii) a fatty amine, and (iii) a polyamine based on a fatty acid, and(d) mixtures thereof;wherein the weight ratio of component A)2) to component A)1) is from 0.001:1 to 0.1:1; andB) molding or compressing the combination formed in A).