Patent ID: 8741984
Filing Date: 2014-06-03
Classification: B41J,C09D

Abstract:
1. An aqueous ink comprising: a polyvinyl alcohol type polymer; a pigment; and a plurality of water-soluble organic solvents, wherein the polyvinyl alcohol type polymer is a copolymer composed of a segment having hydroxyl groups and a segment having no hydroxyl group, wherein at least one of the plurality of water-soluble organic solvents comprises a polyhydric alcohol having a value of (number of hydroxyl groups/number of carbon atoms) in its molecule of 0.40 or less, wherein at least one of the plurality of water soluble organic solvents is a good medium and at least one of the plurality of water soluble organic solvents is a poor medium for the polyvinyl alcohol type polymer that is not adsorbed on the pigment out of the polyvinyl alcohol type polymer, and wherein a content (mass %) of the poor medium based on the total mass of the aqueous ink is more than a content (mass %) of the good medium based on the total mass of the aqueous ink.