Patent ID: 7377631
Filing Date: 2008-05-27
Classification: C09D

Abstract:
1. An aqueous ink used in a system for forming an image using a reaction liquid containing at least a polyvalent metal and an aqueous ink containing at least a pigment dispersion in which a pigment is dispersed with an anionic polymer dispersant, wherein the aqueous ink satisfies the following condition: Taking as (A) an absorbance at a maximum absorption wavelength in a visible region (at a wavelength of 550 nm when carbon black is used as the pigment) of a mixture of 50 g of an 800-times diluted aqueous solution of the reaction liquid and 0.3 g of a 5-times diluted aqueous solution of the aqueous ink being filtered through a filter having a pore size of 0.2 μm 15 minutes after preparation of the mixture, and as (B) an absorbance at a maximum absorption wavelength in the visible region of a mixture of 0.3 g of the 5-times diluted aqueous solution of the aqueous ink and 50 g of pure water, (A) and (B) satisfy the following relationship: