Provided is a heat-stable particulate composition for inkjet use, preferably pigmented and including 10 wt % to 95 wt % of water relative to the total weight of the composition, and 90 wt % to 5 wt % of at least one fluorinated heat-stable binder in particle form, at least one of the characteristic dimensions thereof being smaller than 800 nm.

Provided is a heat-stable particulate composition for inkjet use, preferably pigmented and including 10 wt % to 95 wt % of water relative to the total weight of the composition, and 90 wt % to 5 wt % of at least one fluorinated heat-stable binder in particle form, at least one of the characteristic dimensions thereof being smaller than 800 nm.

The invention provides an ink set and an image forming method in which excellent glossiness is obtained in a case where a surface of an image recording material on which an image is formed using an acidic pre-treatment liquid is overcoated. Namely, the invention provides an ink set and an image forming method using the same, the ink set including: an ink composition which includes a colorant and water; a pre-treatment liquid which contains an acid and water; and an overcoat liquid which includes water and particles of a resin, the resin containing an acidic group selected from the group consisting of a sulfo group, a salt of a sulfo group, a phosphonic acid group, a salt of a phosphonic acid group, a phosphoric acid group, and a salt of a phosphoric acid group.

Disclosed herein are high structured carbon blacks, methods of synthesis and treatment, and dispersions and inkjet ink formulations prepared therefrom. The carbon black can have the following properties: OAN170 mL/100 g; and STSA ranging from 160 to 220 m.sup.2/g. The carbon black can also have the following properties: OAN170 mL/100 g; and a ratio of STSA/BET surface area ranging from 0.7 to 1.

Disclosed herein are high structured carbon blacks, methods of synthesis and treatment, and dispersions and inkjet ink formulations prepared therefrom. The carbon black can have the following properties: OAN170 mL/100 g; and STSA ranging from 160 to 220 m.sup.2/g. The carbon black can also have the following properties: OAN170 mL/100 g; and a ratio of STSA/BET surface area ranging from 0.7 to 1.

An inkjet ink contains at least a first carbon black, a second carbon black, and water. The first carbon black has a DBP oil absorption of less than 130 mL/100 g and a BET specific surface area of less than 300 m.sup.2/g. The second carbon black has a DBP oil absorption of at least 130 mL/100 g and a BET specific surface area of at least 300 m.sup.2/g.

An inkjet ink contains at least a first carbon black, a second carbon black, and water. The first carbon black has a DBP oil absorption of less than 130 mL/100 g and a BET specific surface area of less than 300 m.sup.2/g. The second carbon black has a DBP oil absorption of at least 130 mL/100 g and a BET specific surface area of at least 300 m.sup.2/g.

A particle dispersion (1) is disclosed that comprises a binder component (2) and a solvent component (3). The binder component (2) is dissolvable within the solvent component (3). The particle dispersion (1) also comprises a carbon based nano particle (4), wherein the carbon based nano particle (4) is uniformly dispersed within the binder (2).

Provided is a method for conveniently producing a water dispersion of oxidized carbon black particles that exhibits excellent dispersibility and storage stability, in the case of producing a water dispersion of oxidized carbon black particles by liquid-phase oxidation of carbon black particles using a persulfate. In the method for producing a water dispersion of oxidized carbon black particles by bringing at least one persulfate and carbon black particles into contact to perform liquid-phase oxidation, in the presence of an inorganic alkali in an amount equal to or greater than an amount theoretically necessary for neutralizing an acidic product produced by the liquid-phase oxidation, the persulfate and the carbon black particles are brought into contact in water and subjected to liquid-phase oxidation treatment while being heated.

Provided is a method for conveniently producing a water dispersion of oxidized carbon black particles that exhibits excellent dispersibility and storage stability, in the case of producing a water dispersion of oxidized carbon black particles by liquid-phase oxidation of carbon black particles using a persulfate. In the method for producing a water dispersion of oxidized carbon black particles by bringing at least one persulfate and carbon black particles into contact to perform liquid-phase oxidation, in the presence of an inorganic alkali in an amount equal to or greater than an amount theoretically necessary for neutralizing an acidic product produced by the liquid-phase oxidation, the persulfate and the carbon black particles are brought into contact in water and subjected to liquid-phase oxidation treatment while being heated.