| abstract |
An oil-based ballpoint pen ink composition comprising a) a colorant, b) a solvent containing one or more solvents having the following chemical structural formula (1) n n n where R 1 , R 2 and R 3 are each independently H or CH 3 , as the main solvent, and c) a resin which is soluble in the solvent, wherein the ink viscosity is 700-8000 meals mPa·s and preferably at least 800 mPa·s and less than 6000 mPa·s at 25° C. According to one mode, the main solvent is a mixed solvent comprising this solvent with propyleneglycol monomethyl ether. |