Filler and a process for the production thereof

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 17/69 (2006.01) D21H 11/16 (2006.01) D21H 17/26 (2006.01) D21H 17/67 (2006.01)

Patent

CA 2444011

A filler comprising cellulose or lignocellulose fibrils on which light- scattering ,material particles have been deposited, and a process for the manufacture thereof. In the filler according to the invention, an alkyl derivative of cellulose, such as CMC, has been sorbed to the fibrils. Such a filler can be prepared from a source material containing cellulose or lignocellulose fibrils by first forming a fibril suspension, into which there are fed source materials forming an inorganic or organic salt that, when precipitating, forms a light-scattering pigment. The filler according to the invention has very good strength properties; in particular, good bond strength is achieved by means of it. The concentration of mineral pigment in paper can be increased and furthermore, the grammage of paper can be lowered without the other important properties of the paper deteriorating.

La présente invention concerne une charge comprenant des fibrilles de cellulose ou de lignocellulose sur lesquelles des particules de matière diffusant la lumière ont été déposées, ainsi qu'un procédé pour produire ladite charge. Dans la charge selon cette invention, un dérivé alkylé de cellulose, tel que de la carboxyméthylcellulose (CMC), a été sorbé sur les fibrilles. Le procédé pour préparer une telle charge à partir d'une matière source contenant des fibrilles de cellulose ou de lignocellulose consiste d'abord à produire une suspension de fibrilles, dans laquelle se trouvent des matières sources d'alimentation produisant un sel inorganique ou organique qui, lorsqu'il se précipite, donne un pigment diffusant la lumière. La charge selon cette invention présente de très bonnes propriétés de résistance et son utilisation permet notamment d'obtenir une bonne résistance d'adhésion. On peut augmenter la concentration en pigment minéral dans le papier et réduire le grammage du papier, sans détériorer les autres propriétés fondamentales du papier.

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