METHOD OF PRODUCING COMPOSITE PIGMENT MATERIAL FOR PRODUCING PAINT Russian patent published in 2011 - IPC C09B67/08 C09C3/06 

FIELD: chemistry.

SUBSTANCE: described is a method of producing composite pigment material based on composite particles of a pigment of titanium dioxide and calcium carbonate in micro-marble form. The method involves separate preparation of aqueous dispersions of said components in a high-speed dissolver for 20 minutes, followed by mixing the two dispersions. Titanium dioxide is dispersed in the presence of a polymer dispersant based on an AB-block-copolymer, and the micro-marble is dispersed in the presence of sodium tripolyphosphate. The obtained mixture of the composite pigment material is ready for adding into paint.

EFFECT: simple technique of obtaining pigment material based on titanium dioxide while preserving its physical and chemical properties which correspond to standards, reduction of the amount of expensive titanium dioxide in paints.

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