| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an oil-based ink composition for a writing utensil which does not cause the agglomeration nor discoloration in a microcapsule pigment over time, and can discolor the handwriting excellently. <P>SOLUTION: The oil-based ink composition for the writing utensil contains: the microcapsule pigment that at least contains a leuco dye, a developer, and an agent for controlling a discoloration temperature; and at least one selected from polypropylene glycol, polybutylene glycol, and polyoxypropylene diglyceryl ether as a main solvent. <P>COPYRIGHT: (C)2013,JPO&INPIT |
