| 摘要 |
<p>PURPOSE:To obtain an erasable ink composition which can be erased with an eraser, is improved in long-term stability and gives a drawing improved in water resistance and light resistance on tracing paper or the like by mixing a pigment with a specified polymer dispersant, water and a water-soluble organic solvent. CONSTITUTION:2-30wt.% pigment (A) of a mean particle diameter of about 25nm is mixed with 0.5-20.0wt.% polyoxyethylene polymer dispersant (B) such as an ammonium or amine salt of a copolymer of styrene/maleic acid- polyoxyethylene alkyl ether adduct (semiester) or a polyoxyethylene nonylphenyl ether/formalin condensate, 5-40wt.% water-soluble organic solvent (C) (e.g., ethylene glycol), water (D) and, optionally, additives (E) such as sodium dialkyl sulfosuccinate, an antiseptic and a fungicide.</p> |
