AQUEOUS SUSPENSION PROVIDING HIGH OPACITY TO PAPER

摘要

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.