Process for sizing paper and sizing composition

Details Process for sizing paper and sizing composition Process for sizing paper and sizing composition

D - Textiles, Paper

21

H

D21H 21/16 (2006.01) D21H 21/10 (2006.01)

Patent

CA 2473653

The present invention relates to a process for sizing paper comprising providing an aqueous suspension comprising cellulosic fibres, dewatering said aqueous suspension thereby forming a paper web, said process comprising adding to the cellulosic suspension an aqueous composition comprising aggregates comprising a sizing agent , the composition obtainable by mixing in any order prior to the addition to the aqueous suspension, (i) an aqueous solution comprising at least one coagulation agent, and (ii) an aqueous dispersion comprising a sizing agent, wherein the zeta potential of the composition is less than 20 mV. The invention also refers to an aqueous sizing composition.

Cette invention se rapporte à un procédé d'encollage de papier qui consiste à former une suspension aqueuse contenant des fibres de cellulose, à déshydrater cette suspension aqueuse pour produire une bande de papier et à ajouter à la suspension de cellulose une composition aqueuse contenant des agrégats renfermant un agent d'encollage. On peut obtenir cette composition en mélangeant dans n'importe quel ordre avant son ajout à la suspension aqueuse : (i) une solution aqueuse contenant : un agent de coagulation, et (ii) une dispersion aqueuse contenant un agent d'encollage, le potentiel zéta de cette composition étant inférieur à 20 mV. Cette invention concerne également une composition d'encollage aqueuse.

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