SURFACE-TREATED PRECIPITATED CALCIUM CARBONATE, METHOD FOR PRODUCTION THEREOF AND USE THEREOF Russian patent published in 2012 - IPC C09C1/02 

FIELD: chemistry.

SUBSTANCE: invention relates to mineral filler with high specific surface area, which are used in several fields including the paper industry, and specifically as filler or coating dye. The method of producing a dye which contains surface-treated precipitated calcium carbonate involves steps for (a) providing at least one dye containing surface-treated precipitated calcium carbonate (PCC); (b) providing H₃O⁺ ions; (c) providing at least one anion which is capable of forming water-insoluble calcium salts, said anion being dissolved in an aqueous medium; (d) bringing said dye which contains PCC into contact with said H₃O⁺ ions and with said anions dissolved in an aqueous medium to form a dye suspension containing surface-treated PCC, said surface-treated PCC containing an insoluble, at least partially, crystalline calcium salt of said anion formed on the surface of the PCC, where excess dissolved calcium ions are provided at step (d). The invention also relates to a dye suspension containing surface-treated PCC, obtained using said method, use thereof and surface-treated PCC contained in the suspension.

EFFECT: invention provides high specific surface area of surface-treated precipitated calcium carbonate.

40 cl, 10 tbl, 10 ex