Patent ID: 6435677
Filing Date: 2002-08-20
Classification: B41J,B41M,C09D

Abstract:
An ink-jet printing apparatus applying an ink containing a pigment dispersed in an aqueous medium to a printing medium followed by applying a treatment liquid to react with the ink,said ink containing a first pigment selected from a self dispersing pigment having at least one anionic group bonded directly or through another atomic group to the surface of the first pigment and a self-dispersing pigment having at least one cationic group bonded directly or through another atomic group to the surface of the first pigment, a second pigment capable of being dispersed in an aqueous medium by a polymer dispersant, and at least one dispersant selected from a polymer dispersant having the same polarity as that of the group bonded to the surface of the first pigment and a nonionic polymer dispersant; and said ink-jet printing apparatus comprising application means for applying the ink and the treatment liquid separately to a printing medium to mix the ink and the treatment liquid with each other in a liquid state on the printing medium.