Method for producing paper, paperboard and cardboard

D - Textiles – Paper – 21 – H

Patent

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D21H 21/10 (2006.01)

Patent

CA 2540117

The invention relates to a method for producing paper, paperboard and card board by adding (i) at least one retention agent and (ii) organic, ionic and uncrosslinked microparticles which are water-insoluble and whose mean particle size is less than 500 nm and whose ionic polymerisable monomer content is less than 1 % by weight or organic, ionic and uncrosslinked microparticles which are water-insoluble and whose mean particle size is less than 500 nm and whose ionic polymerisable monomer maximum content is equal to 10 % in weight obtainable by monomer polymerisation in the presence of silicon, waterglass, bentonite and/or the mixture thereof into a pulp and by dehydration of said pulp on a sieve.

L'invention concerne un procédé de fabrication de papier, de carton et de carton épais par addition (i) d'au moins un agent de rétention et (ii) de microparticules organiques, ioniques, non-réticulées, insolubles dans l'eau, présentant une granulométrie moyenne inférieure à 500 nm et une teneur en monomères ioniques, introduits par polymérisation, inférieure à 1 % en poids, ou de microparticules organiques, non-réticulées, insolubles dans l'eau, présentant une granulométrie moyenne inférieure à 500 nm et une teneur maximale en monomères ioniques, introduits par polymérisation, de 10 % en poids, pouvant être obtenues par polymérisation des monomères en présence de silice, de verre soluble, de bentonite et/ou de mélanges de celles-ci, à de la pâte à papier, et déshydratation de la pâte à papier sur un tamis.

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