| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an ink composition for oily erasable marking pens, capable of forming uniform black concentration written marks on a white board also after stored over a long period. SOLUTION: This ink composition for central core type oily erasable marking ink pens comprises (a) at least one kind of organic solvent selected from 2-4C lower aliphatic alcohols, ethylene glycol mono(1-3C)alkyl ethers and propylene glycol mono(1-3C)alkyl ethers, (b) carbon black, (c) polyvinyl butyral resin, (d) at least one kind of erasability-imparting agent selected from fatty acid esters, higher hydrocarbons, higher alcohols, polyoxyethylene ether phosphate esters, polyoxyethylene ether sulfate esters, polyoxypropylene-polyoxyethylene block copolymers, polyoxyethylene ethers and polyoxyethylene esters, and (e) an alkanolamine.</p> |
