| 摘要 |
<p>PURPOSE:To prepare a marking ink for a writing board which prevents the pigment and resin in the ink from being adsorbed by the board surface, exhibits an excellent erasability even long time after writing and gives clear written lines accompanied with neither whitening nor cissing by adding more than one specific compd. to an ink consisting mainly of a colorant, a resin, and a solvent. CONSTITUTION:At least two additives such as pref. 0.05-5wt.% alkyl ether carboxylic acid type anionic surfactant of formula I (wherein R1 is 4-22C alkyl; R2 is 1-4C alkylene; M is H, a metal atom such as Na, K, etc., ammouium, or alkanolamine; and n is 1-20) and pref. 1-20wt.% polyalkylene glycol higher fatty acid diester of formula II (wherein R1 and R2 are each 3-22C alkyl or phenyl; R3 is 2-5C alkylene; and m is 1-10) are added to an ink consisting mainly of a colorant, a resin, and a solvent.</p> |
