Patent ID: 6641762
Filing Date: 2003-11-04
Classification: C08G,C08L

Abstract:
A process for the production of wood composite materials comprising:A) combining wood particles with (1) a polymethylene poly(phenylisocyanate) having a functionality of about 2.1 to about 3.5, and NCO group content of from about 25 to 33%, and a monomer content of from about 30% to 90% by weight, wherein the content of the monomer comprises up to about 5% by weight of the 2,2â€²-isomer, from about 1% up 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; B) coating the combination formed in A) with (2) a solid novolac resin; and C) molding or compressing the coated combination formed in B); wherein components (1) and (2) are present in amounts such that there is from 1 to 25% by weight, based on the total weight of the wood composite, of components (1) and (2), and the weight ratio of component (2) to component (1) is from 1:3 to 10:1.