| 摘要 |
A ballpoint pen ink ensuring a very soft and smooth writing feel even when a strong writing pressure is applied, is obtained. A ballpoint pen ink containing a colorant, a liquid medium, a polyoxyethylene castor oil and/or a polyoxyethylene hardened castor oil, or a derivative thereof, and one kind or a mixture of two or more kinds selected from a monoalkyl ether phosphoric acid, a polyoxyethylene monoalkyl ether phosphoric acid, a dialkyl ether phosphoric acid, a polyoxyethylene dialkyl ether phosphoric acid, a trialkyl ether phosphoric acid, a polyoxyethylene trialkyl ether phosphoric acid and their neutralization products or solutions.
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