Process for increasing the charge on a lignocellulosic...

D - Textiles – Paper – 21 – H

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D21H 11/20 (2006.01) D21C 5/00 (2006.01) D21C 9/00 (2006.01) D21H 17/06 (2006.01) D21H 11/12 (2006.01) D21H 17/00 (2006.01) D21H 17/14 (2006.01)

Patent

CA 2243204

A process for production of a lignocellulosic material modified by conjugation thereto of a phenolic substance comprising a substituent which, 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 an oxidizing agent in the presence of an enzyme capable of catalyzing the oxidation of phenolic groups by the oxidizing agent; and reacting together the products of the reactions; with the proviso that the phenolic substance is not a phenolic polysaccharide. A strengthened lignocellulose-based product (e.g. a paper product) may be prepared by a procedure wherein a product produced in accordance with the latter process is treated with a strengthening agent having an ionic charge of sign opposite to that which is conferred on the modified lignocellulosic material by the charge-conferring substituent.

Procédé d'élaboration d'un matériau ligno-cellulosique modifié par adjonction d'une substance phénolique renfermant un substituant qui, dans la forme conjuguée de la substance phénolique, est ou peut devenir chargé soit négativement soit positivement. Le procédé consiste à faire réagir un matériau fibreux ligno-cellulosique et la substance phénolique avec un agent oxydant en présence d'un enzyme capable de catalyser l'oxydation des groupes phénoliques par l'agent oxydant; à faire réagir ensemble les produits de ces réactions, sous réserve que la substance phénolique ne soit pas un polysaccharide phénolique. Un produit renforcé à base de ligno-cellulose (tel qu'un produit de papier) peut être élaboré selon un mode opératoire dans lequel le produit élaboré conformément à ce dernier processus est traité par un agent renforçateur présentant une charge ionique d'un signe opposé à la charge conférée au matériau ligno-cellulosique modifié par le substituant conférant une charge.

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