INK COMPOSITION FOR PRESSURIZED BALL-POINT PEN AND PRESSURIZED BALL-POINT PEN

摘要

Provided are an ink composition for a pressurized ballpoint pen and a pressurized ballpoint pen which are excellent in a writing property and do not cause ink leakage and which are suited to handwriting. The ink composition for a pressurized ballpoint pen described above comprises at least a colorant, a solvent and silica, wherein a coagulated matter containing at least silica is contained therein, and the ink composition has a viscosity of 10000 to 40000 mPa.s at 25 DEG C. Also, provided is the pressurized ballpoint pen equipped with a refill, in which pressurized gas is charged into an ink reservoir charged with the ink composition for a pressurized ballpoint pen described above and a closed vessel containing the reservoir.