An ink composition includes a resin-coated pigment in which at least a part of pigments is coated with a cross-linked resin, a betaine compound (1) represented by Formula (1), and water. R.sup.1 represents an alkyl group having 6 to 20 carbon atoms, R.sup.2 and R.sup.3 each independently represent a chain hydrocarbon group having 1 to 3 carbon atoms, L.sup.1 represents a single bond or a divalent linking group, L.sup.2 represents a divalent linking group, and A.sup.− represents a —SO.sub.3.sup.− group or a —COO.sup.− group.

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The pretreatment liquid of the present invention is applicable for a fabric to be used for inkjet textile printing, and the pretreatment liquid contains a block copolymer including a hydrophobic block derived from a hydrophobic resin having an SP value of less than 11 and a hydrophilic block derived from a hydrophilic resin having an SP value of 11 or more, with the difference between the SP values of the hydrophobic resin and the hydrophilic resin of 1.0 or more; and water.

Provided is an ink including water, an organic solvent, resin particles, and a thickener. The thickener comprises polymer particles having a carboxylic acid structure. A proportion of the thickener in the ink is 0.05% by mass or more. Change in viscosity of the ink between before and after storage of the ink at 70° C. for 1 week is 20% or less. The change in viscosity is expressed by Formula (1): Change in viscosity (%)=[(a−b)/b]×100 . . . Formula (1), where a represents a viscosity (mPa.Math.s) at 25° C. of the ink when the ink is prepared, and b represents a viscosity (mPa.Math.s) at 25° C. of the ink after the ink is stored at 70° C. for 1 week.

The inkjet ink disclosed herein includes an inorganic solid portion including an inorganic pigment and glass and a monomer component having a photocurability. The ink is configured such that a volume of the inorganic solid portion when a total volume of the inkjet ink is 100 vol % is 30 vol % or less, and a volume of the glass when the total volume of the inorganic solid portion is 100 vol % is 78 vol % or more.

The inkjet ink disclosed herein includes an inorganic solid portion including an inorganic pigment and glass and a monomer component having a photocurability. The ink is configured such that a volume of the inorganic solid portion when a total volume of the inkjet ink is 100 vol % is 30 vol % or less, and a volume of the glass when the total volume of the inorganic solid portion is 100 vol % is 78 vol % or more.

Provided are an ink jet ink for forming an infrared absorbing image and applications thereof, the ink jet ink including an infrared absorbing material represented by Formula (1), resin particles, a water-soluble organic solvent, a water-soluble organic compound X1, a surfactant, and water. M.sup.+ represents a proton, a monovalent alkali metal cation, or an organic cation, L.sup.1 represents a methine chain consisting of 5 or 7 methine groups, a methine group at a center of the methine chain has a substituent, R.sup.1 to R.sup.4 each independently represent a hydrogen atom or a substituent, and X represents O, S, or Se.

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Provided are an ink jet ink for forming an infrared absorbing image and applications thereof, the ink jet ink including an infrared absorbing material represented by Formula (1), resin particles, a water-soluble organic solvent, a water-soluble organic compound X1, a surfactant, and water. M.sup.+ represents a proton, a monovalent alkali metal cation, or an organic cation, L.sup.1 represents a methine chain consisting of 5 or 7 methine groups, a methine group at a center of the methine chain has a substituent, R.sup.1 to R.sup.4 each independently represent a hydrogen atom or a substituent, and X represents O, S, or Se.

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The present invention relates to a water-based ink containing at least pigment-containing water-insoluble crosslinked polymer particles (A), a polymer emulsion (B) and water, in which a water-insoluble crosslinked polymer constituting the crosslinked polymer particles (A) is obtained by subjecting a polymer that contains a constitutional unit derived from a carboxylic acid monomer having an acid value of not less than 200 mgKOH/g and a constitutional unit derived from a hydrophobic monomer, to crosslinking reaction with an epoxy compound, and a polymer constituting the polymer emulsion (B) contains a constitutional unit derived from a carboxylic acid monomer and a constitutional unit derived from a hydrophobic monomer. The water-based ink of the present invention is excellent in ejection stability and fastness of the printed characters or images while maintaining good optical density.

The present invention relates to a water-based ink containing at least pigment-containing water-insoluble crosslinked polymer particles (A), a polymer emulsion (B) and water, in which a water-insoluble crosslinked polymer constituting the crosslinked polymer particles (A) is obtained by subjecting a polymer that contains a constitutional unit derived from a carboxylic acid monomer having an acid value of not less than 200 mgKOH/g and a constitutional unit derived from a hydrophobic monomer, to crosslinking reaction with an epoxy compound, and a polymer constituting the polymer emulsion (B) contains a constitutional unit derived from a carboxylic acid monomer and a constitutional unit derived from a hydrophobic monomer. The water-based ink of the present invention is excellent in ejection stability and fastness of the printed characters or images while maintaining good optical density.

The present disclosure is drawn to polyurethane dispersions. In one example, a polyurethane dispersion can include a polyurethane with a polymeric ionic side chain and a polymeric non-ionic side chain. The polyurethane can be formed of polymerized monomers including a diisocyanate, a first polymeric diol, and a second polymeric diol. The first polymeric diol can include a first polymer chain replacing a hydrogen atom of a thiol group of a 1-thioglycerol molecule. The first polymer chain can include a block of a polymerized ionic group-containing vinyl monomer. The second polymeric diol can include a second polymer chain replacing a hydrogen atom of a thiol group of a 1-thioglycerol molecule. The second polymer chain can include a block of a polymerized non-ionic vinyl monomer, and the second polymer chain can be devoid of ionic groups.