| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent corrosion of a metallized ball in the unused time in regard to a ballpoint pen having a ballpoint pen tip having the ball even when the surface of the ball in the portion projecting from the tip opening part is covered up with a hot-melt adhesive. <P>SOLUTION: The hot-melt adhesive is used to which alkyl phosphate and/or polyoxyethylene alkyl ether phosphate is added. <P>COPYRIGHT: (C)2008,JPO&INPIT |
