| 摘要 |
PROBLEM TO BE SOLVED: To prepare an ink which can realize high-quality recording, the formation of a high-definition color image and an improvement in reliability by incorporating a water-soluble dye, water, at least one compound selected from groups A and B of compds., and at least one compound selected from a group C of compds. SOLUTION: A water-soluble dye, water, and a group A consisting of compds. (A-1 to A-9: nine compds., such as ethylene glycol mono-n-butyl ether, which have high compatibility with water and an alkyl group through an ether bond in the molecular end) in an amt. of 6 to 12wt.% based on the total amt. of the ink, at least one compd. selected from a group B consisting of compds. (B-1 to B-3: three compds., such as surfactants based on ethylene oxide adduct to acetylene glycol, which can impart rapid penetrability into plain paper) in an amt. of 0.3 to 3.0wt.% based on the total amt. of the ink, and at least one compd. selected from a group C consisting of compds. [two or more compds. represented by the formula (wherein (k) is 3 to 50; (m) is 3 to 25, (n) is 3 to 25, (m + m) is 6 to 50)] in an amt. of 0.5 to 5wt.% are incorporated so that the surface tension of the ink is regulated to not less than 30dyne/cm with the viscosity being modified to not more than 5cP. |
