Schwarze Tintenzusammensetzung für Tintenstrahlaufzeichnung

摘要

A black ink for inkjet recording comprises a dye dissolved and/or dispersed in an aqueous medium. The dye has a lambda max of 500-700 nm and a half value width of >= 100 nm in an absorption spectrum of a dilute solution normalized to an absorbance of 1.0. The black ink has a transition metal ion content of = 0.1 mmol/l; and a forced fading rate constant k v i s of = 5.0 x 10 -> 2> [hour -1>]. Black ink for inkjet recording comprises a dye dissolved and/or dispersed in an aqueous medium. The dye has a lambda max of 500-700 nm and a half value width of >= 100 nm in an absorption spectrum of a dilute solution normalized to an absorbance of 1.0. The black ink has a transition metal ion content of = 0.1 mmol/l; and a forced fading rate constant k v i s of = 5.0 x 10 -> 2> [hour -1>]. The forced fading rate constant is decided by printing a black square symbol of JIS code 2223 in 48-point using the black ink, measuring the reflection density D v i s of the printed symbol through a status A filter to obtain an initial density, forcedly fading the printed symbol by an ozone fading tester capable of continuously generating 5 ppm of ozone, and determining the time taken until the reflection density reaches 80% of the initial density.