METHOD OF PRODUCTION OF THE COMPOSITE PIGMENT FOR MANUFACTURE OF THE CARDBOARD AND PAPER Russian patent published in 2006 - IPC D21H19/36 D21H19/38 D21H19/44 D21H19/46 D21H19/64 D21H17/67 D21H17/69 D21H17/70 D21H17/36 C01C1/02 C01F7/02 C01F11/02 

FIELD: pulp and paper industry; methods of production of the composite pigment for manufacture of the cardboard and paper.

SUBSTANCE: the invention is pertaining to the method of production of the composite pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. Calcium hydroxide is mixed with kaolin and added with aluminum sulfate in the aqueous medium at stirring. The aqueous medium contains the binding chosen from the group, which includes starch and polyvinyl alcohol in amount of 1.5-5.0 % from the mass of the absolutely dry pigment, and-or the water soluble colorant in amount of 0.1-0.5 % from the mass of the absolutely dry pigment. The technical result of the invention is the improvement of the composite pigment quality and expansion of its field of application.

EFFECT: the invention ensures improvement of the composite pigment quality and expansion of the field of its application.

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