PIGMENT FOR USAGE IN THE COATINGS OF THE REGISTERING MEDIUM OF THE INK-JET PRINTING SYSTEMS AND THE METHODS OF THE PIGMENT PRODUCTION Russian patent published in 2007 - IPC C09B67/10 C09C3/06 C09D11/00 B41M5/10 

FIELD: chemical industry; computer industry; methods of production of the pigments used in the coatings of the registering medium of ink-jet systems.

SUBSTANCE: the invention is pertaining to production of the pigments suitable for usage in the compositions of the registering mediums used for the ink jet printing. The invention provides, that the surface of the pigmental loose material is subjected to action of the water-soluble salt of the polyvalent metal in the aqueous medium. The treated surface of the particles gains the sizeable cationic surface charge. The salt represents the metal salt of the Group II or the Group III of Periodic table. The registering mediums for the ink-jet printing treated with the coating composition containing the indicated pigment ensure the high density fast-drying and anti-bleeding colorful images with the sufficient water-resistance. The compositions used for creation of the coating also have the advantage pertaining to the net cost and to the improved rheology at the more higher content of the pigment in the coating as compared with the coatings based on the siliceous pigments.

EFFECT: the invention ensures production of the coatings with the indicated pigment having the high density, fast-drying and anti-bleeding colorful images with the sufficient water-resistance at the low net cost, the improved rheology at the more higher content of the pigment in the coatings, as compared with the coatings based on the siliceous pigments.

30 cl, 5 dwg, 7 tbl, 7 ex