Oil-based ink composition for writing instruments, and writing instrument, marking pen and ballpoint pen containing the same

摘要

PROBLEM TO BE SOLVED: To provide an oil-based ink composition for a writing instrument capable of forming handwriting having high water resistance without causing bleeding on a writing surface of various materials while maintaining high color developability using a dye. It is to provide. An oil-based ink composition for a writing instrument comprising a dye, an organic solvent, and a phenol compound represented by the following general formula (1). [In the formula, each R is independently hydrogen or an alkyl group having 1 to 5 carbon atoms, and R1 is an alkyl group having 1 to 5 carbon atoms or an alkyl halide having 1 to 5 carbon atoms. A phenyl group, a hydroxyphenyl group, or an alkyl group having 1 to 5 carbon atoms substituted with a hydroxyphenyl group, and R2 is a halogenated alkyl group having 1 to 5 carbon atoms, a phenyl group, or a hydroxyphenyl group , Any one of 1 to 5 carbon atoms substituted with hydroxyphenyl]