Chemically modified wood

B - Operations – Transporting – 27 – N

Patent

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Details

B27N 1/00 (2006.01) C08H 8/00 (2010.01) B27N 3/00 (2006.01) C08J 7/14 (2006.01) C08L 1/10 (2006.01) C09F 1/04 (2006.01)

Patent

CA 2197449

A granulate of wood or some other cellulose-containing material, pieces or particles of said material being at least partially esterified with 10-50 % of a dicarboxylic acid anhydride and then impregnated with 2-25 % of a polyol, the granulate being stable in storage and being possible to hot press or hot form later. A method for preparing the granulate by esterification at 80-160 °C and, subsequently, impregnation at 150 °C at most. A method for manufacturing formed articles by hot pressing or hot forming of the granulate, without the presence of a formaldehyde-containing adhesive and preferably without the presence of any other type of adhesive.

L'invention concerne un granulat de bois ou un autre matériau à base de cellulose, des pièces ou des particules dudit matériau au moins partiellement estérifiés avec 1 à 50 % d'un anhydride d'acide dicarboxylique et imprégné avec 2-25 % de polyole. Le granulat est stable lors de son stockage et peut être comprimé à chaud ou formé à chaud ultérieurement. L'invention traite aussi d'un procédé pour préparer le granulat par estérification à 80-160 DEG C et pour l'imprégner à 150 DEG C au maximum. L'invention a aussi pour objet un procédé de fabrication d'articles formés par compression ou par formage à chaud des granulats, sans adhésif à base de formaldéhyde, et de préférence, sans adhésif de quelque type que ce soit.

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