PREPARATION METHOD FOR SHEAR-THINNING WATER-BASED BALL-POINT PEN INKS, SHEAR-THINNING WATER-BASED BALL-POINT PEN INK COMPOSITIONS, AND BALL-POINT PENS EMPLOYING THE SAME

摘要

A shear-thinning water-based ball-point pen inkcomposition comprising from 1% by weight to 35% byweight of a colorant, from 2% by weight to 35% byweight of a water-soluble polar solvent, from 1% byweight to 30% by weight of a nonionic surface activeagent having an HLB value within the range of from 8to 12, and the balance being water and adjustingadditives, and having a viscosity within the range offrom 25 mPa.s to 160 mPa.s (a value at the number ofrevolution of 100 rpm in an EM type rotationalviscometer, 25°C) and a shear thinning index withinthe range of from 0.1 to 0.6; the nonionic surfaceactive agent having a mixed phase comprising a phasestanding dispersed in the form of fine particles and aphase standing dissolved in a molecular state.A method for preparing the ink composition and aball-point pen employing the ink composition are alsodisclosed.