OIL-BASED INK COMPOSITION FOR WRITING UTENSILS, WRITING UTENSIL USING SAME AND AIR BRUSH UNIT USING SAME

摘要

An oil-based ink composition for writing utensils, which exhibits good writing performance with respect to wiring surfaces formed of various materials, while having improved friction resistance, namely good resistance of handwriting written therewith to repeated rubbing or to rubbing with stronger forces; a writing utensil which uses this oil-based ink composition for writing utensils; and an air brush unit which uses this oil-based ink composition for writing utensils.　An oil-based ink composition for writing utensils according to the present invention is characterized by containing at least an aluminum pigment, a coloring agent, a resin, an organic solvent and a polydimethyl siloxane, and is also characterized in that: the polydimethyl siloxane has a polyether-modified group at both ends; and the sum of hydroxyl groups of the polyether-modified groups is 3 or more.