BINDER RESIN AND SYNERGIST COMPOSITION INCLUDING A PARTING AGENT AND PROCESS OF MAKING LIGNOCELLULOSIC ARTICLES

摘要

A method for preparing compression molded or pressed lignocellulosic article s is disclosed. The method involves forming a binder resin by combining a polyisocyanate component with a parting agent and preferably a synergist. The parting agent is the reaction product of an isocyanate compound and an isocyanate-reactive compound of the general structure R-(ao)n-Y where: R is a hydrophobic group containing alkyl, alkary l, polyaryl, or siloxane moieties; (ao) is an alkylene oxide or mixture of alkylene oxides; n is from 1 to 25; and Y represents a monofunctional isocyanate-reactive group. A resinated lignocellulosic mixture is formed by combining the binder resin with lignocellulosic particles. Then a compression molded or pressed lignocellulosic article is formed by compressi ng the resinated lignocellulosic mixture at an elevated temperature and under pressure. It is particularly preferred that the binder resin further include a synergist of either a C1-4 N- alkylpyrrolidone, gamma-butyrolactone, or a mixtures of them. The most preferred synergist is N- methyl-2- pyrrolidine.