| 摘要 |
<p>There is described a water base ink composition for directly filling in a ball-point pen comprising a dyestuff in the range of 3% to 10% by weight; a humectant in the range of 10% to 40% by weight. A thixotropic agent in the range of 0.6% to 1.0% by weight, said thixotropic agent being composed of a cross-linkable acrylic acid polymer having a molecular weight ranging from 2,000,000 to 6,000,000; and water as a balance. The water base ink compositions have no spinnability, tackiness tendency and possibility of drippings and runnings from a pen-point, and can be directly filled into a ball-point pen.</p> |
