| 摘要 |
PROBLEM TO BE SOLVED: To provide a water-based ink being excellent in lubricity, quick-drying property, low foamability, and temporal stability and capable of resisting high-speed printing.SOLUTION: The water-based ink composition contains 0.01% to 5% by mass of a compound represented by the formula (1), 5% to 30% by mass of a compound represented by the formula (2), 5% to 30% by mass of glycerin, 1% to 25% by mass of a coloring agent, and water as a balance (in RO-(EO)-(PO)-H (1), Rrepresents a 3,5,5-trimethyl-1-hexyl group, EO represents an oxyethylene group, PO represents an oxypropylene group, a represents an average addition molar number of the oxyethylene group of a=3 to 15, b represents an average addition molar number of the oxypropylene group of b=3 to 5, and a/b=1 to 3) (in RO-(AO)-H (2), Rrepresents a hydrogen atom or an alkyl group having 2 to 4 carbon atoms, AO represents an oxyalkylene group having 2 or 3 carbon atoms, c represents an average addition molar number of the oxyalkylene grouphaving 2 or 3 carbon atoms of c=1 to 3). |
