INK COMPOSITION FOR WRITING BOARD

摘要

INK COMPOSITION FOR WRITING BOARD Disclosed is a wipe-erasable ink composition for a writing board, which has good erasability and long-period stability. This ink composition comprises a colored polymer formed by dyeing an organic solvent-soluble resin having a sulfonic acid group or a salt thereof with a basic dye, a volatile organic solvent and, as additives, (A) a nonionic surface active agent having an HLB value of 8 to 14 and/or a cationic organic compound, and (B) a slightly volatile or nonvolatile organic compound.