| abstract |
The invention relates to a pigment, a filler or a mineral containing a natural calcium carbonate, treated with one or more donors of H3 O + ions and gaseous CO2, allowing the reduction of the weight of the paper at constant surface, without loss of the properties. physical when used as a bulk or coating pigment for said paper. In particular, the invention relates to a pigment, a filler or a mineral containing a natural calcium carbonate, or dolomite, or mixtures of talc-calcium carbonate, kaolin-calcium carbonate alone or in combination with natural fibers and / or synthetic and the like, treated with one or more donors of moderately strong to strong H3 O + ions in the presence of CO2 gas. Applications in particular paper-making, with obtaining in particular good properties of the sheet, ie a reduction in its weight for a given thickness. |