| 摘要 |
PROBLEM TO BE SOLVED: To obtain a ball point pen improved in corrosive properties of a ball point pen tip when not in use.SOLUTION: A ball point pen is obtained by blocking a tip ink discharge port as a gap between a tip opening part of a ball holder and a ball, of a ball point pen tip rotatably held in a state where a part of the ball as a writing member is protruded from the tip opening part of the ball holder, with a coat of polyglyceryl fatty acid ester as a solid at room temperature or a thermoplastic resin composition containing polyglyceryl fatty acid ester as a solid at room temperature. |
