WATER-BASED INK, INK-JET DEPOSITING METHOD, INK CARTRIDGE, INK DEPOSITING UNIT, JET DEVICE FOR DEPOSITING INK AND IMAGE FORMATION METHOD Russian patent published in 2009 - IPC C09D11/00 B41J2/01 

FIELD: chemistry.

SUBSTANCE: invention relates to water-based ink which can be used in jet pringing methods and devices. The water-based ink contains water, several water-soluble organic solvents and water-insoluble pigment. The said water-soluble organic solvents contain at least one good solvent for the said water-insoluble pigment and at least one bad solvent for the said water-insoluble pigment. Total amount A (wt %) of good solvent(s) in the ink and total amount B (wt %) of bad solvent(s) in the ink is in ratio which ranges from 10:5 to 10:10, inclusively in both cases. Given water-soluble organic solvents contain a bad solvent which has value Ka, which is determined using the Bristow method, which is highest of all Ka values of all water-soluble organic solvents present in the ink, and given water-soluble organic solvents contain at least glycerin as good solvent and polyethylene glycol 600 as bad solvent. Described also is a jet-printing method, an ink cartridge, a printing unit, a jet printing device and an image formation method via jet printing using the said water-based ink.

EFFECT: water-based ink has sufficiently large area coefficient, even for small amount of ink, and provides for an image with high printing density.

21 cl, 19 dwg, 13 tbl, 20 ex