Patent ID: 6416696
Filing Date: 2002-07-09
Classification: B27N,C08L

Abstract:
A process for the production of wood composite materials comprising:a) combining wood particles with 2 to 15% by weight, based on the total weight of the wood composite, of a composition consisting essentially of: (1) an aqueous dispersion of a blocked polyisocyanate component consisting essentially of an adduct of: (i) a polymethylene poly(phenylisocyanate) having a functionality of about 2.1 to about 3.5, an NCO group content of from about 30% to about 33%, and a monomer content of from about 30% to about 90% by weight, wherein the content of the monomer comprises from up to about 5% by weight of the 2,2â€²-isomer, from about 1% to about 20%. by weight of the 2,4â€²-isomer, and from about 25% to about 65% by weight of the 4,4â€²-isomer, based on the entire weight of the polyisocyanate; and (ii) a compound corresponding to one of the general formulas: â€ƒwherein: R: represents a hydrogen atom, an alkyl group having from 1 to 12 carbon atoms, a phenyl group, or a substituted phenyl group; and X: represents a hydrogen atom, an alkyl group having from 1 to 12 carbon atoms, an alkoxy group having from 1 to 12 carbon atoms, a phenyl group, a substituted phenyl group, or a methylol radical; and (2) an aqueous solution of a phenolic resin, wherein the weight ratio of component (1) to component (2) is from 4:1 to 1:20; and b) molding or compressing the combination formed in a).