| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain an ink compsn. improved in stability, viscosity, optical density, and printing characteristics by compounding an insoluble pigment, a polymeric dispersant for the pigment, an aq. carrier, and an auxiliary solvent mixture comprising specific substances. SOLUTION: This compsn. comprises (A) ingredients comprising about 0.01-20.0% insoluble pigment, about 0.001-40.0% polymeric dispersant, and about 40.0-99.0% aq. carrier and (B) an auxiliary solvent mixture comprising (a) a 2-8C alkanediol or a mixture thereof and (b) a substance (substances) selected from among (i) polyethylene glycol or a mixture thereof with polypropylene glycol, (ii) a polyol/alkylene oxide condensation product of the formula, and (iii) a mixture of substances (i) and (ii). The wt. ratio of A/B is (about 95/about 5)-(about 5/about 95). In the formula, X is H or a 1-6C alkyl; R is H; a 1-6C alkyl, or CH2 O(CH2 CH2 O)e H; b is 0 or 1; a+d+f (c+e) is about 2-100; and f is about 1-6.</p> |
