THREADED FILLER OR COLORANT, OR INORGANIC MATERIAL FOR PAPER, IN PARTICULAR, NATURAL CALCIUM CARBONATE-CONTAINING COLORANT, METHOD FOR MANUFACTURING, COMPOSITION CONTAINING THE SAME, AND USES THEREOF Russian patent published in 2005 - IPC

FIELD: chemical and pulp-and-paper industry.

SUBSTANCE: aqueous suspension of at least one filler or mineral contains natural carbonate, polymeric dispersing agent as stabilizer of suspension viscosity, product of natural carbonate treatment with gaseous CO₂, and product of natural carbonate reaction with at least one medium or strong H₃O⁺-donors, has pH more than 7.5 at 20⁰C. As natural carbonate suspension contains calcium carbonate (e.g., marble, calcite, carbonate-containing dolomite, chalk, ore mixtures thereof with talcum, and/or TiO₂, MgO, or other minerals inert to H₃O⁺-donors). As H₃O⁺-donors suspension contains H₂SO₃, HSO-4

, H₃PO₄, oxalic acid or mixtures thereof in molar ratio to carbonate of 0.1-2. Used carbon dioxide under pressure of 0.05-5 bar may be added from outside, recycled or obtained by continuous H₃O⁺-donors addition. Treatment with H₃O⁺-donors and gaseous CO₂ may be carried_{out simultaneously or separately, wherein in the last case temperature and time of respective stages are 5-90⁰C and 1-5 h. Claimed suspension is dried to obtain colorant. Colorant has BET specific surface of 5-200 m²/g according to ISO 9277 and mean grain size measured by sedimentation method of 0.1-50 mum. Colorants are used in compositions, as agent for paper lamination, for paper pulp filling, coloration, and board production. Obtained paper is useful in numeric and ink-jet printing.}

EFFECT: paper with decreased mass at constant surface.

33 cl, 1 dwg, 2 tbl, 8 ex