| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil-based ball point pen or a ball point pen refill wherein an ink residual quantity existing in an ink holding tube in the oily ball point pen or the ball point pen refill is enabled to be accurately read from the outside. SOLUTION: The ball point pen or the ball point pen refill has fluorine modified silicone oil or silicone modified fluoroplastic disposed on the contact face of an inner wall of an ink holding tube of the ball point pen or the ball point pen refill and a contact surface to the ball point pen ink composition. COPYRIGHT: (C)2005,JPO&NCIPI |
