| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a vermilion seal ink with which a large amt. of ink can be sticked on a stamp only by one operation and which exhibits excellent separability from a vermilion seal plate face by mixing a castor oil (its derivative) a pigment and a specified agent for preventing the vermilion seal from being sticked on the plate face. SOLUTION: A vermilion seal ink is obtd. by mixing a castor oil or/and a castor oil derivative (A), a pigment (B) and an agent for preventing a vermilion seal from being sticked on a plate face which is a least one selected from among esters of dibasic acid and esters of tribasic acid with an ester value of 200-600KOHmg/g. In addition, as the castor oil derivatives in the ingredient A, a castor oil polyhydric alcohol ether modified with an alkylene oxide or a castor oil fatty acid alkyl ester wherein the castor oil is modified with an alcohol is used. As the ingredient B, quinacridone red, cadmium red, etc., are pref. In addition, as the ingredient C, dibutyl phthalate, dibutyl adipate, dibutyl fumalate, tri-2-ethylhexyl trimellitate, etc., are pref.</p> |
