AQUEOUS INK FOR INKJET PRINTING

• Main Authors: KOZAKE, Katsuyuki, AKAGI, Ryuichi, EGAWA, Tsuyoshi
• Format: Patent
• Language: English; French; German
• Published: 07.02.2024
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COLOUR PRINTING; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; LINING MACHINES; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PERFORMING OPERATIONS; POLISHES; PRINTING; PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; STAMPS; TRANSPORTING; TYPEWRITERS; USE OF MATERIALS THEREFOR; WOODSTAINS

The present invention relates to [1] a water-based ink for ink-jet printing on a low-liquid absorbing printing medium, containing a pigment, a polymer dispersant, a water-soluble organic solvent and water, in which the water-soluble organic solvent contains at least one solvent (S1) selected from the group consisting of propylene glycol monomethyl ether and propylene glycol monopropyl ether and at least one solvent (S2) selected from the group consisting of 1,4-butanediol, 1,6-hexanediol, dipropylene glycol and 2-pyrrolidone; a content of the water-soluble organic solvent in the water-based ink is 20 to 45% by mass; and a content of the solvent (S1) in the water-soluble organic solvent is 78 to 95% by mass, and [2] an ink-jet printing method including the step of printing characters or images on a low-liquid absorbing printing medium using the aforementioned ink. The water-based ink for ink-jet printing according to the present invention is capable of providing a printed material that is excellent in substrate-adhesion properties while maintaining high image density.