Patent ID: 8524802

Claim:
A ball point pen ink composition having viscosity of 500-5000 cps at 25° C., the composition comprising: 5-25 wt % of a first solvent and 20-55 wt % of a second solvent, wherein the first solvent evaporates more slowly than the second solvent; 16-36 wt % of a resin; 0.1-2 wt % of a structural viscosity imparting agent; 0.05-1 wt % of polyvinyl pyrrolidone; 0.1-25 wt % of a lubricant; 3-25 wt % of a colorant; and associative thickening agents/additives comprising: 0.01-3 wt % of an amine or polyamine; and/or 0.1-20 wt % of a diol or polyol; wherein said associative thickening agents/additives form temporary bridges with the structural viscosity imparting agent while also, at the same time, forming associative coupling with said associative thickening agents/additives.