| abstract |
[Objective] To obtain an oil-based ink composition for ballpoint pens that has both good handwriting without light cracks and leakage and light writing feeling. [Constitution] A pigment, an organic solvent, a viscosity modifier and a non-Newtonian viscosity imparting agent of less than 0.1% by weight, a viscosity at a shear rate of 500 s -1 at 25 ° C. is 800 to 5000 mPa · s, and a shear rate of 5 s. The oil-based ink composition for ball-point pens whose viscosity in -1 is 3000-20000 mPa * s and whose non-Newtonian viscosity index is 0.5 or more and 0.9 or less. [Selection figure] None |