Novel dry mineral pigment containing calcium carbonate, aqueous suspension containing said pigment, and the uses thereof

A process for preparing a treated mineral pigment comprising the steps of:

• (a) treating calcium carbonate, that is dispersed with a dispersing agent, in an aqueous suspension for 0.2 to 10 hours with the following consisting of:
• (i) phosphoric acid at a molar quantity, relative to the number of moles of calcium carbonate, of 0.001 to 1,
• (ii) gaseous CO2 formed in situ and/or coming from an external supply, and
• (iii) one or more compounds of formula R—X at a molar quantity, relative to the number of moles of calcium carbonate, of 0.001 to 1, wherein the one or more compounds of formula R—X have 8 to carbon atoms and are selected from the group consisting of linear fatty acids, ramified fatty acids, fatty amines, fatty alcohols, whether or not saturated, mixtures thereof, and their mixtures with synthetic or natural fatty compounds,
• to obtain an aqueous suspension of mineral pigment;
• (b) optionally adjusting the pH of the aqueous suspension of mineral pigment by the addition of a base;
• (c) optionally introducing at least one anionic or cationic electrolyte to the aqueous suspension of mineral pigment;
• and
• (d) optionally drying the aqueous suspension of mineral pigment obtained from step (a), step (b) and/or step (c),
• wherein the calcium carbonate in step (a) is selected from the group consisting of ground marble, calcite, chalk, dolomite and any mixture thereof.