BLACK INK FOR JET PRINTING, INK SET, JET PRINTING METHOD, INK CARTRIDGE, PRINTING ELEMENT AND DEVICE FOR JET PRINTING Russian patent published in 2009 - IPC C09D11/00 C09B33/18 B41M5/00 B41J2/01 

FIELD: printing industry.

SUBSTANCE: invention is related to jet printing dye. Black dye for jet printing is described, which includes dye compound of (I) formula, or its salt and water soluble organic dissolvent, which has relative dielectric permeability of 30.0-70.0 at 20°C and is able to dissolve specified dye compound in amount from 1.0 wt %, at 25°C, with its content of 50 wt %, or more from mass of all water soluble organic dissolvents contained in black ink for jet printing: Common formula (I) , where R₁ and R₂ - atom of hydrogen or sulfonyl group; R₃ and R₄ C_1-4-alkyl or alkoxyl, which may be replaced by sulfonic group; n is equal to 0 or 1.

EFFECT: production of black ink for jet printing, which possesses higher resistance to atmospheric conditions, higher optical density and provides restoration of sticking properties of printing head nozzles.

7 cl, 6 dwg, 7 tbl, 16 ex