A compound represented by formula (1) or a salt thereof, and an ink including the same. In formula (1), each Q independently represents a halogen atom; R.sup.11 and R.sup.12 independently represent an alkyl group substituted by an ionic hydrophilic group; and A.sup.1 represents a C1-C3 alkoxy-substituted alkylamino group ##STR00001##

A compound represented by formula (1) or a salt thereof, and an ink including the same. In formula (1), each Q independently represents a halogen atom; R.sup.11 and R.sup.12 independently represent an alkyl group substituted by an ionic hydrophilic group; and A.sup.1 represents a C1-C3 alkoxy-substituted alkylamino group ##STR00001##

A compound represented by formula (1) or a salt thereof, and an ink including the same. In formula (1), each Q independently represents a halogen atom; R.sup.11 and R.sup.12 independently represent an alkyl group substituted by an ionic hydrophilic group; and A.sup.1 represents a C1-C3 alkoxy-substituted alkylamino group

##STR00001##

A compound represented by formula (1) or a salt thereof, and an ink including the same. In formula (1), each Q independently represents a halogen atom; R.sup.11 and R.sup.12 independently represent an alkyl group substituted by an ionic hydrophilic group; and A.sup.1 represents a C1-C3 alkoxy-substituted alkylamino group

##STR00001##

Bis(azo-benzene) diamine monomers and a method of synthesizing the monomers are provided. The bis(azo-benzene) diamine monomers, in combination with amine reactive monomers, form polymers, such as polyimides and copolyimides, having photomechanical and thermomechanical properties.

Provided are a pigment dispersion liquid including a pigment, a polymer dispersant, and water, in which the pigment is a pigment including a compound represented by General Formula (1) as described in the specification, a tautomer thereof, or a salt of the compound or the tautomer, and the polymer dispersant includes a polymer compound having a repeating unit represented by General Formula (2-1) and a repeating unit represented by General Formula (2-2) as described in the specification, and having a structure represented by General Formula (3) introduced into at least one terminal of the main chain; and an inkjet ink including this pigment dispersion liquid.

##STR00001##

In General Formula (3), L represents a linking group; R.sub.4 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group; and the symbol * represents a linking bond.

Bis(azo-benzene) diamine monomers and a method of synthesizing the monomers are provided. The bis(azo-benzene) diamine monomers, in combination with amine reactive monomers, form polymers, such as polyimides and copolyimides, having photomechanical and thermomechanical properties.

Bis(azo-benzene) diamine monomers and a method of synthesizing the monomers are provided. The bis(azo-benzene) diamine monomers, in combination with amine reactive monomers, form polymers, such as polyimides and copolyimides, having photomechanical and thermomechanical properties.

Bis(azo-benzene) diamine monomers and a method of synthesizing the monomers are provided. The bis(azo-benzene) diamine monomers, in combination with amine reactive monomers, form polymers, such as polyimides and copolyimides, having photomechanical and thermomechanical properties.

An ink-jet ink set includes a black ink containing carbon black; a cyan ink containing a first cyan dye; a magenta ink containing a first magenta dye; a yellow ink containing a first yellow dye; and a gray ink containing a second cyan dye, a second magenta dye, and a second yellow dye. The cyan ink, the magenta ink, the yellow ink, and the gray ink have a ROD of 65% or more, the ROD being defined by Equation (A). The gray ink has an OD value of 1.40 to less than 2.30, the OD value being defined by Equation (B).