| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a black ink composition for an oil-based marking pen that can secure the fixity of the coating membrane at a non-absorbing faces as metal or plastic faces equal to or more than the case that a non-polar solvent as xylene or the like is used, when C.I. solvent black 7 and a polar organic solvent are used. SOLUTION: This ink composition is composed of (1) C.I. solvent black 7, (2) propylene glycol monomethyl ether, (3) an oil-soluble resin (phenol resin, xylene resin or the like), (4) polyoxyethylene alkyl ether phosphoric acid and/or polyoxyethylene alkyl phenyl ether phosphoric acid and (5) a silicone polymer surfactant (polyoxy-propylene-modified silicone, carboxy-modified silicone and the like).</p> |
