Patent ID: 6123795
Filing Date: 2000-09-26
Classification: B32B,D21H,Y10T

Abstract:
A method of preparing a sheet of lignocellulosic material for the manufacture of a finished product which preparation method includes the steps of:(a) impregnating the sheet of the lignocellulosic material with an impregnating composition, optionally in excess and comprising:(i) a composition for the chemical modification of the lignocellulosic material comprising a dicarboxylic anhydride or a tricarboxylic anhydride selected from the group consisting of maleic anhydride, phthalic anhydride, succinic anhydride, tetrahydrophthalic anhydride and trimellitic anhydride dissolved in a non-aqueous solvent selected from dichloromethane and liquid carbondioxide, and(ii) a composition for resinating the lignocellulosic material comprising an isocyanate thermosetting resin dissolved in a non-aqueous solvent selected from dichloromethane and liquid carbondioxide,(b) removing from the impregnated lignocellulosic material any excess of the impregnating composition; and(c) removing the non-aqueous solvent or solvents.