| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an oily ink for a ballpoint pen that is used for a ballpoint pen injecting an ink through a ball pen chip and forming a handwriting, more specifically, that is smooth in the rotation of a ball when writing and can smoothly write to the last.SOLUTION: The oily ink for a ballpoint pen comprises a coloring agent, one kind or two or more kinds of organic solvents selected from among a glycol-based solvent, a glycol ether-based solvent and an alcoholic solvent, (a) a phosphinate compound having an alkoxy polyoxyethylene group and (b) an alkoxy phosphinate compound. The phosphinate compound (a) is contained in an amount of 0.05-5 wt% based on the total of the ink and the ratio of the alkoxy phosphinate compound (b) to the phosphinate compound (a) is 10-30 (weight ratio).</p> |
