FLUORESCENT INK COMPOSITION FOR WRITING UTENSIL

摘要

PURPOSE:To obtain a fluorescent ink compsn. which is nontoxic and excellent in fluorescent color and aging stability by mixing a solvent mainly comprising propylene glycol monomethyl ether with a soluble fluorescent pigment and a ketone resin. CONSTITUTION:This compsn. is prepd. by mixing a solvent mainly comprising propylene glycol monomethyl ether with a soluble fluorescent pigment (e.g. MPI-501, a product of Nippon Fluorescent Chemical Co.) as the colorant and a ketone resin as the resin component. An example of a suitable solvent comprises 80-100wt.% propylene glycol monomethyl ether and 20-0wt.% at least either dipropylene glycol monomethyl ether or ethanol. The compsn. is esp. suitable for a marking pen with an inner lead.