Binder resin and synergist composition including a parting...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 97/02 (2006.01) B27N 1/02 (2006.01) B27N 3/00 (2006.01) C08K 5/15 (2006.01) C08K 5/205 (2006.01) C08K 5/34 (2006.01)

Patent

CA 2363835

A method for preparing compression molded or pressed lignocellulosic articles 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, alkaryl, 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 compressing 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.

On divulgue une méthode pour la préparation d'articles lignocellulosiques moulés par compression ou pressés. La méthode consiste à fabriquer une résine liante en combinant un polyisocyanate avec un agent de démoulage et, idéalement, un produit synergiste. L'agent de démoulage est le produit de la réaction entre un isocyanate et un composé réagissant aux isocyanates de structure générale R-(ao)n-Y où : R est un groupement hydrophobe comportant des fractions alkyle, alkaryle, polyaryle ou siloxane; (ao) est un oxyde d'alkylène ou un mélange d'oxydes d'alkylène; n se situe entre 1 et 25; Y représente un groupement réagissant aux isocyanates. Un mélange lignocellulosique résiné est formé en combinant une résine liante avec des particules lignocellulosiques. Un article lignocellulosique moulé par compression ou pressé est ensuite formé par compression du mélange lignocellulosique résiné à température élevée et sous pression. Il est particulièrement souhaitable que la résine liante renferme en outre un produit synergiste, soit une N-alkylpyrrolidone en C1 à 4, soit une gamma-butyrolactone, soit un mélange des deux. Le produit synergiste idéal est la N méthyl-2-pyrrolidine.

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