Abstract: Provided is an aqueous ink for ink jet that has excellent storage stability and whose viscosity does not easily increase even in a case where the ink is stored in a severe environment such as a high temperature condition. This aqueous ink for ink jet contains a coloring material and a block copolymer. The block copolymer includes an A block having a segment A having no acid group and a group represented by Formula (1) bonded to one terminal of the segment A, and a B block having a segment B having an acid group and a group represented by Formula (2) bonded to one terminal of the segment B. (In Formula (1), R1 represents an alkylene group, and M represents a hydrogen atom, an alkali metal, ammonium or organic ammonium. In Formula (2), R2 and R3 each independently represent an alkyl group or the like.

Abstract: Provided is an aqueous ink for ink jet that has excellent storage stability and whose viscosity does not easily increase even in a case where the ink is stored in a severe environment such as a high temperature condition. This aqueous ink for ink jet contains a coloring material and a block copolymer. The block copolymer includes an A block having a segment A having no acid group and a group represented by Formula (1) bonded to one terminal of the segment A, and a B block having a segment B having an acid group and a group represented by Formula (2) bonded to one terminal of the segment B. (In Formula (1), R1 represents an alkylene group, and M represents a hydrogen atom, an alkali metal, ammonium or organic ammonium. In Formula (2), R2 and R3 each independently represent an alkyl group or the like.