Patent ID: 8491213
Filing Date: 2013-07-23
Classification: B43K,C09D

Abstract:
1. A water-based ballpoint pen comprising: an aqueous ink; a ball; a ballpoint pen tip for holding said ball at a front end thereof and for discharging said ink from said top end portion; an ink follower following said ink with consumption of said ink; and an ink container directly containing said ink and said ink follower and for supplying said ink to said tip, said ink container communicating with a rear portion of said tip, wherein the ink is a non-shear-thinning aqueous ink having a viscosity of from 1 to 50 mPa·s, measured with an B-type rotary viscometer at 20° C., and wherein the ink follower comprises at least a base oil and a thickener and satisfies that the point (ω) at which its tanδ in viscoelasticity determination exceeds than 1 falls within a range of 20 rad/s≦ω≦450 rad/s.