| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an oil-base, erasable ink compsn. for a marking pen which, even when the handwriting is a material on the surface of a white board, possesses good erasability in an initial stage and can retain the erasability with the elapse of time and, in addition, has improved temp. dependency of the erasability. SOLUTION: This oil-base, erasable ink compsn. for a ballpoint pen comprises: at least one member selected from a 2 or 3C lower aliph. alcohol and an ethylene glycol monoalkyl ether or a propylene glycol monoalkyl ether; an erasability-imparting agent comprising a trimethylolalkane fatty acid triester, a polyoxyethylene alkyl ether phosphate, a polyoxyethylene alkyl ether sulfate, or a salt thereof, and an aliph. acid ester of an 8-18C satd. fatty acid with a 4-20C satd. aliph. alcohol, the aliph. acid ester having a total carbon number of 20 to 32 and an m.p. of 10 deg.C or below; a polyvinyl butyral resin; and a colorant.</p> |
