PROCESS FOR INCREASING THE CHARGE ON A LIGNOCELLULOSIC MATERIAL, PRODUCT OBTAINABLE BY THE PROCESS, AND USE OF THE PRODUCT IN THE PREPARATION OF A LIGNOCELLULOSE-BASED PRODUCT

摘要

A process for production of a lignocellulosic material modified by conjugationthereto of a phenolic substance comprising a substituentwhich, in the conjugated form of the phenolic substance, is, or may become,negatively or positively charged, respectively, comprises:reacting a lignocellulosic fibre material and the phenolic substance with anoxidizing agent in the presence of an enzyme capable ofcatalyzing the oxidation of phenolic groups by the oxidizing agent; andreacting together the products of the reactions; with the provisothat the phenolic substance is not a phenolic polysaccharide. A strengthenedlignocellulose-based product (e.g. a paper product) may beprepared by a procedure wherein a product produced in accordance with thelatter process is treated with a strengthening agent having anionic charge of sign opposite to that which is conferred on the modifiedlignocellulosic material by the charge-conferring substituent.