Aqueous compositions and their use in the manufacture of...

Details Aqueous compositions and their use in the manufacture of... Aqueous compositions and their use in the manufacture of...

C - Chemistry, Metallurgy

01

B

C01B 33/20 (2006.01) D21H 17/66 (2006.01)

Patent

CA 2521111

A process of preparing an aqueous composition comprising a polysilicate, wherein the composition is a substantially uniform liquid when measured at 25~C, comprising the steps of, i) providing an aqueous liquid having a source of silicate, ii) adjusting the pH of the liquid to between about 2 and about 10.5, thereby causing polymerisation of the silicate, iii) allowing sufficient time for the polymerisation to proceed to substantial completion and thereby forming a product comprising gelled material, iv) subjecting the gelled material to sufficient shear to form a substantially uniform liquid. The novel aqueous composition made by this process is useful in the manufacture of paper and paperboard either as a mineral filler or as a retention/drainage aid.

Cette invention se rapporte à un procédé servant à préparer une composition aqueuse comprenant un polysilicate et se présentant sous la forme d'un liquide sensiblement uniforme, lorsqu'elle est mesurée à 25 ·C, ce procédé consistant : (i) à produire un liquide aqueux comportant une source de silicate, (ii) à régler le pH du liquide à une valeur comprise entre environ 2 et environ 10, 5, afin d'entraîner la polymérisation du silicate, (iii) à laisser la polymérisation se poursuivre pendant une période suffisante jusqu'à son achèvement, de façon à former un produit contenant une substance gélifiée, (iv) à soumettre cette substance gélifiée à un cisaillement suffisant pour former un liquide sensiblement uniforme. Cette nouvelle composition aqueuse ainsi produite par ce procédé est utile dans la fabrication de papier et de carton, soit comme charge minérale soit comme auxiliaire de rétention/drainage.

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