Nye behandlede fyllstoffer, pigmenter eller mineraler for papir, s¶rlig pigment inneholdende naturlig CaCO3, deresfremstilling og blandinger inneholdende disse

摘要

The invention concerns a pigment filler or a mineral containing natural calcium carbonate, treated with one or several H3O+ ion donors and gaseous CO2, for reducing constant surface paper weight, without loss of physical properties when it is used as mass or coating pigment for said paper. In particular, the invention concerns a pigment, filler or mineral containing a natural carbonate calcium, or dolomite, or talcum-calcium carbonate, kaolin-calcium carbonate mixtures alone or combined with natural and/or synthetic fibres or the like, treated with one or several H3O+ ion donors ranging from moderately strong to strong in the presence of CO2 gas. The invention is particularly applicable to the paper industry for obtaining good sheeting properties, that is a reduction in weight for a specific thickness.