| 摘要 |
PROBLEM TO BE SOLVED: To provide an ink composition for a ballpoint pen, which provides good writing feeling even in a specific low-viscosity region, and can suppress wearout of a ball-receiving seat.SOLUTION: The ink composition for a ballpoint pen has a special viscosity, and contains a spherical microparticle having a particle diameter in a specific range in a specific amount in the ink. The ink becomes good in writing feeling in writing, and after the stabilization, the wearout of a ball-receiving seat can be suppressed. |
