CYAN DYE MIXTURE, WATER-BASED CYAN INK COMPOSITION, AND METHOD OF INK-JET RECORDING

摘要

A cyan dye mixture; an ink composition containing the mixture; and a method of ink-jet recording with the ink composition. The print obtained by the method is characterized by discoloring or fading little even when allowed to stand in a well ventilated shade or in an ozone gas. The cyan dye mixture comprises compounds which are obtained by chlorosulfonating, as a starting material, copper phthalocyanine or a sulfonated copper phthalocyanine and then aminati ng the chlorosulfonation product with an aminating agent used in an amount of a t least 2.5 mol per mol of the starting material, and which are represented by the following formula (1): (1) wherein M represents a proton, alkali metal ion, alkaline earth metal ion, onium ion of an organic amine, or ammonium io n; m is an integer of 1 to 4; and n is an integer of 0 to 3; provided that m+n is an integer of 1 to 4.