AQUEOUS INK, INK CARTRIDGE AND JET RECORDING METHOD Russian patent published in 2022 - IPC C09D11/324 C09D11/38 

FIELD: printing equipment.

SUBSTANCE: invention can be used for inkjet recording on various media. Aqueous ink for jet printing contains a pigment — carbon black — and a fluorescent clarifier. Fluorescent clarifier is selected from the following compounds: C.I. Fluorescent Brightener 351, C.I. Fluorescent Brightener 24, C.I. Fluorescent Brightener 28, C.I. Fluorescent Brightener 71, C.I. Fluorescent Brightener 134, C.I. Fluorescent Brightener 220, C.I. Fluorescent Brightener 260, C.I. Fluorescent Brightener 52 and C.I. Fluorescent Brightener 140. Ratio of the content (wt. %) of the fluorescent clarifier to the content (wt. %) of the pigment ranges from 0.010 % or more to 3.000 % or less. Invention also discloses an ink cartridge and an inkjet printing method.

EFFECT: providing good color tone of ink with high optical density during printing.

9 cl, 2 dwg, 4 tbl