| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a marking ink which is used for writing boards, and produces residue-gathered lumps having a weak adhesive force and capable of therefore weakly adhering to the surfaces of the writing boards to prevent the residues from scattering, without producing fine residue particles, when the handwritings of the marking ink are erased. SOLUTION: This marking ink for writing boards essentially contains polyvinyl butyral and/or polyvinyl formal as a resin and further a compound represented by the general formula 1 (see the specification) and/or a vegetable oil glyceride as a surfactant.</p> |
