OIL-BASED INK COMPOSITION FOR WRITING INSTRUMENT, AND WRITING INSTRUMENT, MARKING PEN, AND BALLPOINT PEN CONTAINING SAME

摘要

[Problem] Provided is an oil-based ink composition for a writing instrument, which can form handwriting having excellent water resistance in which no bleeding occurs on written surfaces of various materials with a dye retaining color development. [Solution] An oil-based ink composition for a writing instrument, comprising a dye, an organic solvent and a phenolic compound of the following general formula (1): [wherein R is each independently hydrogen or an alkyl group having 1 to 5 carbon atoms, R 1 is any of an alkyl group having 1 to 5 carbon atoms, a halogenated alkyl group having 1 to 5 carbon atoms, a phenyl group, a hydroxyphenyl group, and an alkyl group having 1 to 5 carbon atoms substituted by a hydroxyphenyl group, and R 2 is any of a halogenated alkyl group having 1 to 5 carbon atoms, a phenyl group, a hydroxyphenyl group, and an alkyl group having 1 to 5 carbon atoms substituted by a hydroxyphenyl group].