| 摘要 |
<p>PURPOSE:To obtain a marking ink compsn. excellent in writing properties and erasability by mixing a pigment, an org. solvent, an org.-solvent-sol. resin, a fatty acid ester (deriv.), and a specific erasing additive. CONSTITUTION:A marking ink compsn. is prepd. by mixing a pigment (e.g. Phthalocyanine Green), an org. solvent (e. g. ethanol), an org.-solvent-sol. resin (e.g. polyvinyl butyral), a fatty acid ester or its deriv. (e.g. isopropyl myristate). and a polyoxyethylene polyoxypropylene alkyl ether (e.g. polyoxyethylene polyoxypropylene cetyl ether). The compsn. enables writing on a smooth and nonpermeable surface, giving written lines easily erasable merely by mildly wiping with a dry cloth, etc., and excellent in erasability even after the lapse of time.</p> |
