Patent ID: 6235150
Filing Date: 2001-05-22
Classification: D21C,D21H

Abstract:
A process for production of pulp fibres, lumen-loaded with a calcium carbonate particulate filler comprising:a) contacting pulp fibres having anionically charged lumen surfaces, with an aqueous solution of a cationic polymer in an amount of 0.01% to 1.0%, by weight of polymer based on the oven dry weight of the pulp fibres with formation of cationically charged polymer bound to the lumen surfaces, andb) contacting the resultant pulp fibres with particulate calcium carbonate filler having an anionic charge and a particle size of 0.4 to 1.5 .mu.m, and binding the particulate calcium carbonate filler to the lumen surfaces, to produce pulp fibres lumen loaded with said calcium carbonate filler at a loading of 0.1 to 0.4 g of calcium carbonate filler per gram of fibre and a lumen content of said filler of 9 to 28%, by weight, based on the weight of lumen loaded fibres.