Near-infrared absorptive image-forming composition, ink and electrophotographic toner using the same, and inkjet-recording method, electrophotographic-recording method and near-infrared-ray-reading method using those

摘要

A near-infrared absorptive image-forming composition, which contains a dye of formula (I): wherein L₁ is a methine chain composed of 7 methine groups, and L₁ may have a substituent but the substituent is not an amino group; R¹, R² and A each independently are an alkyl or cycloalkyl group, which may be substituted; B is a group of atoms necessary for forming an aromatic hydrocarbon ring or aromatic heteroring, and the ring formed with B may be substituted; Y is a cation necessary for keeping the charge balance in the molecule, but Y may not be present when Y is unnecessary for the charge balance; and R¹ and R² may bond to each other, to form a ring; an ink and an electrophotographic toner, each containing the composition; and an inkjet-recording method, an electrophotographic-recording method, and a near-infrared-ray-reading method.