OBTAINING PIGMENTS Russian patent published in 2016 - IPC C09C1/02 C09C3/10 C01F11/18 D21H17/69 D21H19/38 C08K3/26 

FIELD: chemistry; textile and paper.

SUBSTANCE: invention can be used in paper production, paper coatings, plastics, dyes. Aqueous composition includes material containing calcium carbonate in amount of at least 10 wt% with respect to total dry weight. Composition has Brookfield viscosity lower than 2500 mPa·s at 20 °C. Composition also contains at least one anionic charged comb polymer, having specific charge from -5 to -500 Coulomb/g with pH of 8 and optionally at least one binding agent in an amount of at least 2.5 wt% with respect to total dry weight of composition. Composition also includes at least one salt of divalent or trivalent cation in amount of 1-20 wt% with respect to total dry weight of composition. At that, at least 95 wt% of total amount of said salt is dissolved in composition.

EFFECT: invention allows to reduce formation of agglomerated and flocculated particles in an aqueous composition containing calcium carbonate with maintenance of its viscosity, improve mechanical and optical properties of paper products.

41 cl, 4 dwg, 2 tbl