| 摘要 |
<P>PROBLEM TO BE SOLVED: To allow a thermoplastic adhesive material to maintain its ease of separation from the surface of a ball in a ballpoint pen in which at least an opening portion of an ink discharge port of a ball holder freely rotatably holding the ball as a writing member with part of the ball being partially protruded is blocked by the thermoplastic adhesive material, by solving a problem in which writing performance is deteriorated since the thermoplastic adhesive material applied to at least the opening portion of the ink discharge opening becomes hard to separate from the ball with the lapse of time. <P>SOLUTION: In the ballpoint pen in which at least the opening portion of the ink discharge port of the ball holder freely rotatably holding the ball as a writing member with part of the ball being protruded is blocked by the thermoplastic adhesive material, a fatty acid, a fatty acid dimer and a fatty acid ester are added to the thermoplastic adhesive material. <P>COPYRIGHT: (C)2012,JPO&INPIT |
