Aqueous suspension providing a high degree of opacity paper

Details Aqueous suspension providing a high degree of opacity paper Aqueous suspension providing a high degree of opacity paper

D - Textiles, Paper

21

H

D21H 17/67 (2006.01) D21H 17/68 (2006.01) D21H 21/28 (2006.01)

Patent

CA 2402971

The aqueous suspension contains hydrated n calcium sulfate (CaSO4 nH2O), the value of n ranging from 0 to 2 (0<n<2) and an additive. The method for preparing said aqueous suspension involves the following steps: a) mixing the calcium sulfate and at least one of said additives with water and b) homogenizing the mixture under strong agitation. The method for preparing the paper includes adding said aqueous suspension to the cellulose fiber suspension.

L'invention concerne une suspension aqueuse comprenant du sulfate de calcium n hydraté (CaSO¿4? nH¿2?O), n étant compris entre 0 et 2 (0<n<2), ainsi qu'un additif. Le procédé permettant d'obtenir cette suspension aqueuse consiste a) à mélanger le sulfate de calcium et au moins un desdits additifs avec de l'eau et b) à homogénéiser le mélange par forte agitation. Le procédé de préparation de papier consiste à ajouter cette suspension aqueuse à une suspension de fibres de cellulose.

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