REMOVABLE INK FOR PRINTING AND METHOD OF THEIR REMOVAL FROM CARRIER Russian patent published in 2024 - IPC C09D11/00 B01D11/02 B08B7/00 

FIELD: chemistry.

SUBSTANCE: invention relates to production of removable ink for printing and a method for removal thereof from paper or other media using supercritical, liquid or dense gaseous carbon dioxide under pressure. Removable ink contains soluble in CO₂ at pressure of 40–120 atm and temperature of 20–90 °C polymer base. In addition, the ink contains either dyes which are soluble in such CO₂ under pressure, or dyes and/or pigments which are not soluble therein, but which are cross-linked by a cross-linking agent with a polymer base which is soluble in such CO₂ under pressure. Method of removing ink involves placing paper or other carrier with the above inks applied into a high-pressure flow reactor with CO₂ equipped with a heating circuit, at pressure of 40–120 atm and temperature of 20–90 °C.

EFFECT: providing fast and non-damaging media removal of ink from printed paper and other media for direct reuse of ink and cleaned paper or other media for printing.

11 cl, 1 dwg, 17 ex