Patent ID: 8246734

Claim:
A writing ink composition, comprising: (a) an oil-based component containing a polar solvent and at least one spinnability imparting agent selected from the group consisting of polyvinyl pyrrolidone, polyvinyl alcohol, polyethylene oxide and hydroxypropyl cellulose, and an oil-soluble dye; and (b) a water-based component containing water, polyhydric alcohol, at least one thixotropy imparting agent selected from the group consisting of xanthan gum, locust bean gum, welan gum, gellan gum, guar gum, pectin, carrageenan, carboxyvinyl polymer, gum arabic, tragacanth gum, rhamsan gum, gelatin, sodium alginate and carboxymethyl cellulose, and a pigment, the water-based component being dispersed in the oil-based component.