| abstract |
Agent for the pretreatment of coarse mineral materials annihilating the viscosifying effect of swelling clays present in said materials, used for conditioning said materials before refining them in an aqueous medium by attrition or grinding, characterized in that, with the aim of producing refined pigmentary suspensions with a concentration at least equal to 75% by weight and of low viscosity and stable over time, said pretreatment agent is formed of acid polymers and / or copolymers comprising at least one ethylene carboxylated monomer.n n n High concentration suspensions of pigmentary mineral materials are prepared from the conditioned materials. |