| 摘要 |
A non-aqueous ball point pen ink and a ball point pen using this ink contains a colorant, an organic solvent, a non-Newtonian viscosity imparting agent, and 0.4 to 0.8 mass % in total of 0.2 to 0.6 mass % of polyvinyl pyrrolidone with a weight-average molecular weight of about 1,000,000 to 1,500,000 and 0.1 to 0.4 mass % of polyvinyl pyrrolidone with the weight-average molecular weight of about 2,500,000 to 3,000,000. By means of this invention, feathering and blobbing of ink are eliminated, ink leakage is prevented, and a satisfactory writing smoothness of a ball-point pen is obtained.
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