| 摘要 |
<p>PURPOSE:To obtain a marking ink for writing board having excellent erasability of the letter, line, etc., drawn on especially a plastic writing board by adding a specific alkylamine or alkylamide adduct, etc., to an ink containing a coloring agent, a resin and a solvent. CONSTITUTION:This marking ink is produced by incorporating an ink containing (A) a coloring agent (e.g. an oil-soluble dye, an inorganic pigment and an organic pigment), (B) a resin (polyvinyl butyral, cellulose, etc.) and (C) a solvent (a volatile solvent such as ethyl alcohol) with (D) at least one kind of compound selected from (i) an oxyalkylene adduct of an alkylamine such as formula I and formula II (R<1> is a 2-20C alkyl; R<2> is a 2-5C alkylene; m, n and p are each addition molar number of oxyalkylene and is 1-20), etc., (ii) an oxyalkylene adduct of an alkylamide of formula III, etc., and (iii) an alkylamine oxide of formula IV (R<4> is a 1-5C alkyl or H). The amount of the component D is preferably 1.0-10wt.% based on the total ink.</p> |
