AQUEOUS INK FOR INK-JET PRINTING Russian patent published in 2018 - IPC B41J2/15 C09D11/30 C09D11/32 C09D11/326 C09D191/06 

FIELD: printing industry.

SUBSTANCE: invention relates to a composition of aqueous ink for ink-jet printing. In the method, the composition comprises water, a co-solvent and an aqueous submicron dispersion of the colorant wax in the form of a plurality of particles with a size of about 150 to less than 300 nm. These particles contain a colorant core surrounded by a wax shell. Said colorant wax dispersion contains at least 25 % of the colorant of the total amount of the colorant and wax. Above dispersion is prepared by (a) melting and mixing a dry colorant with at least one wax to form a colorant concentrate; (b) milling the colorant concentrate (a); (c) combining the milled colorant concentrate (b) with water and dispersing to form a colorant wax dispersion. In this case, melting and mixing (a) as well as milling (b) are performed in an immersion or horizontal mill. And a piston homogenizer is used for combining (c).

EFFECT: proposed ink has an improved anti-adhesion release efficiency in transfer inkjet printers and provides prints with improved gloss properties with an increase in the shelf life of ink and the expansion of their color range.

16 cl, 14 dwg, 5 tbl, 2 ex