| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a ball-point pen, and in more detail, to obtain the ball-point pen capable of providing a good handwriting with no plumping. <P>SOLUTION: In the ball-point pen wherein a ball-point pen tip consisting of a ball coming into contact with a face to be written and rotating, and a ball holder for holding freely rotatably this ball under a projected condition from a tip opening part of an inner hole being an ink passage, is directly or through a joint connected to an ink tank in which ink is directly stored, and the ink in the ink tank is communicated with the inner hole of the ball holder, the ball has one or two or more selected from titanium oxide, aluminum oxide and silicon oxide on at least the surface, and the ink comprises an aqueous medium, a coloring agent, and a so-called phosphate compound with a structure in which a part of or the whole hydrogen atoms on the hydroxyl groups of phosphoric acid are replaced with hydrocarbon groups. <P>COPYRIGHT: (C)2007,JPO&INPIT |
