| abstract |
A surface bleaching process of a suspension of mineral matter characterized in that said process comprises the following process steps: (a) prepare by means of dispersion and / or crushing at least one suspension of aqueous mineral base material, (b) add during and / or after step (a) from 0.005% by weight to 0.5% by weight, with respect to the dry mineral matter of at least one random copolymer or alkylene oxide block, preferably a copolymer of blocks |