| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a ballpoint in which a back flow inhibitor for ink hardly adheres to an ink-contg. tube, in which air bubbles can be removed by a centrifu gal force not so strong as to precipitate titanium oxide in ink, and which enables good writing. SOLUTION: This ballpoint has an ink-contg. tube at one end of which is installed a pen point and which is filled with ink and a back flow inhibitor therefor. Ink used here contains titanium oxide, and the inhibitor at least contains a nonvolatile and/or hardly volatile liq. (e.g. polybutene), N-lauroyl-L- glutamic acid-α,γ-di-n-butylamide, and a dextrin fatty acid ester having a degree of substitution of 1.8 or lower.</p> |
