Patent ID: 6498203
Filing Date: 2002-12-24
Classification: C09D

Abstract:
A rubber-erasable aqueous ink for a writing material composition comprising water, a water-soluble polar solvent, a shear-thinning agent, and a particulate adhesive colored resin comprising a pigment and an adhesive resin which is adhesive on at least a part of a surface thereof, the particulate adhesive colored resin having a particle diameter distribution such that the amount of particles having a particle diameter of from 2 &mgr;m to 20 &mgr;m is not less than 70% by weight of all the particles, wherein the particulate adhesive colored resin, when applied to and dried on a paper, is point-bonded to the surface of the paper in such an arrangement that the various adhesive colored resin particles are present independently of each other or scattered, and wherein said ink exhibits a viscosity at 100 rpm of from 25 to 160 mPaÂ·s, determined at 25Â° C. by means of an EMD viscometer, and a shear-thinning index of from 0.1 to 0.7.