Patent ID: 7638017

Claim:
An aqueous suspension comprising a component ( 1 ) comprising one or more pigments, fillers or minerals, and optionally ( 2 ) a dispersant polymer, wherein, a) said component ( 1 ) comprises a natural carbonate and the reaction product or products of said carbonate with gaseous CO 2 and with one or more medium-strong to strong H 3 O + ion-providers, b) wherein said suspension has a pH greater than 7.5 measured at 20° C., and wherein paper filled or coated by treating with said suspension, at a constant area and thickness, weighs less than paper treated with said suspension but without said reaction products, wherein the natural carbonate is a natural calcium carbonate (CaCO 3 ), and wherein the quantity in moles of the one or more medium-strong to strong H 3 O + ion-providers relative to the number of moles of CaCO 3 is in total between 0.1 and 2.