PURPOSE: An oil-based ink that is prepared by adding a resin soluble in both an organic solvent and water to an oil-soluble ink mainly consisting of oil-soluble dyes, organic solvents and oil-soluble resins, thus preventing ink blotting, blurring and causing scarcely dry-up at the pen point.
CONSTITUTION: The objective oil-based ink is produced by adding (A) an oil- soluble dye such as C. I. solvent yellow-2, (B) an organic solvent such as methanol, (C) an oil-soluble resin such as gum-rosin and (D) a resin soluble in both organic solvents and water such as polyvinyl alcohol wherein the amount of component A is preferably 1W20wt%, component B is 50W90wt%, component C is 2W10wt% and component D is 0.01W10wt% based on the total amount of the ink, when necessary, by adding a dissolution assistant, anticorrosive and other additives, and mixing them with stirring.
HAMAMOTO HIDETOSHI
NISHIWAKI OSAMU
