| 摘要 |
<p>PURPOSE:To obtain the subject ink composition capable of easily erasing alone the written parts fretted with a dry cloth, etc., irrespective of the types of white boards such as white board, plastic board, coated board. CONSTITUTION:The objective composition comprises (A) water as solvent, (B) a colorant dissolved or dispersed in the water, (C) a water-soluble polyvinyl acetal resin as film-forming agent and (D) an aqueous emulsion of a hardly volatile aliphatic carboxylic ester which is liquid at normal temperatures.</p> |
