| 摘要 |
<p>A non-aqueous ball point pen ink includes a colorant, an organic solvent, a non-Newtonian viscosity imparting agent and a thickening agent as main components. The thickening agent comprises only polyvinyl pyrrolidone with a weight-average molecular weight of about 40,000 to 100,000. The non-Newtonian viscosity index of the ink is not less than 0.1 and less than 0.4, the viscosity at a shearing speed of 500 sec<-1> is not less than 1,000 and less than 3,000 mPa.s at 20 DEG C, and the viscosity at a shearing speed of 0.19 sec<-1> is not less than 40,000 mPa.s and not more than 70,000 mPa.s at 20 DEG C. With the non-aqueous ball point pen ink and a ball point pen using the ink, feathering and blobbing of the ink can be eliminated, and leakage of the ink is prevented. Further, writing quality, when performed with low pressure is similar to that of an aqueous ball point pen.</p> |
