| 摘要 |
PURPOSE:An erasable ink having providing a halography having high concentration and clarity, erasable easily with a rubber eraser within a fixed time after writing, obtained by adding an inorganic compound, semisolid substance, etc. having extremely small particle diameters, inert to ink, to a rubber component, a volatile solvent, pigment, etc. CONSTITUTION:An ink consisting of preferably 10-28wt% rubber component such as cis-1,4-polyisoprene, 20-40wt% volatile solvent such as n-hexane, etc., 12-35wt% pigment such as carbon black, and 17-38wt% nonvolatile solvent such as dioctyl adipate, etc. is blended with <=20wt% inorganic compound (calcium carbonate <=1.5mu particle diameters, etc.) having extremely small particle diameters, inert to ink and/or <=7wt% semisolid substance (e.g., lanolin, etc.) and/or soft solid substance (e.g., parafin wax, etc.) having <=130 deg.C melting point, to give the desired ink. EFFECT:Badness of ink flow will not occur even in long-term writing, and writing is possible without causing wear of a ball holder. |
