Patent ID: 6464820
Filing Date: 2002-10-15
Classification: B27N,C08G,C08K,C08L

Abstract:
A method for preparing a compression molded or pressed lignocellulosic article comprising the steps of:a) forming a binder resin by combining from about 75 to 99.5 weight percent based on the total weight of the binder resin of a polyisocyanate component with from about 25 to 0.5 weight percent based on the total weight of the binder resin of a parting agent, the parting agent comprising the reaction product of an isocyanate compound and an isocyanate-reactive compound of the general structure Râ€”(ao)nâ€”Y â€ƒwherein R is a hydrophobic group containing alkyl, alkaryl, or polyaryl, moieties, wherein the alkyl moieties comprise straight chain or branched hydrocarbons with 6 or more carbon atoms, the alkaryl moieties comprise monoalkyl, dialkyl, or trialkyl substituted aromatic hydrocarbons with 9 or more carbon atoms, and the polyaryl moieties comprise a polyphenyl structure that is either alkyl substituted or unsubstituted; (ao) is an alkylene oxide or mixture of alkylene oxides selected from the group consisting of ethylene oxide, propylene oxide, butylene oxide, and mixtures thereof; n is from 1 to 25; and Y represents a monofunctional isocyanate-reactive group; b) forming a resinated lignocellulosic mixture by combining from about 1 to 10 weight percent based on the total weight of the lignocellulosic mixture of the binder resin with from about 99 to 90 weight percent based on the total weight of the lignocellulosic mixture of lignocellulosic particles, the lignocellulosic particles having a moisture content of from 2 to 15 weight percent; and c) forming a compression molded or pressed lignocellulosic article by compressing the resinated lignocellulosic mixture at an elevated temperature and under pressure.