Ink-jet printing method

摘要

The present invention relates to [1] a pigment-containing water-based ink for ink-jet printing which is free of turbidity and excellent in capability of suppressing occurrence of image unevenness (MOTTLING) when printed on a low-water absorbing recording medium, said ink including at least one acetylene glycol (A) selected from the group consisting of 2,4,7,9-tetramethyl-5-decyne-4,7-diol and the like, and a nonionic surfactant (B), a content of the component (A) in the water-based ink being not less than 1.0% by mass and not more than 3.0% by mass, and a mass ratio of the component (B) to the component (A) [(B)/(A)] being not less than 1 and not more than 3; and [2] an ink-jet printing method for printing images or characters on a low-water absorbing recording medium using said water-based ink for ink-jet printing.

主权项

1. An ink-jet printing method for printing images or characters on a recording medium using a water-based ink for ink-jet printing, wherein
the water-based ink comprises: at least one acetylene glycol (A) selected from the group consisting of 2,4,7,9-tetramethyl-5-decyne-4,7-diol, 3,6-dimethyl-4-octyne-3,6-diol and 2,5-dimethyl-3-hexyne-2,5-diol; a nonionic surfactant (B); a pigment; and water, wherein the nonionic surfactant (B) is a compound represented by the general formula (1):
RO-[(EO)m/(PO)n]-H  (1) wherein R is a hydrocarbon group having not less than 12 and not more than 24 carbon, EO is ethyleneoxy group, PO is a propylene oxy group, m is a number of from 10 to 60, and n is a number 0; a content of the component (A) in the water-based ink is not less than 1.0% by mass and not more than 3.0% by mass, and a mass ratio of the component (B) to the component (A) (B/A) is not less than 1 and not more than 3; and the recording medium has a water absorption of not less than 0 g/m2 and not more than 10 g/m2 as measured in a pure water contact time of 100 ms.