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US 7,922,801 B2Granted
Carbon black aqueous dispersion and method of producing the same
AssigneeTokai Carbon Co., Ltd.
InventorsShigemi Toda, Makoto Sekiyama
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AssigneeTokai Carbon Co., Ltd.
InventorsShigemi Toda, Makoto Sekiyama
Estimating the term…
A carbon black aqueous dispersion which has excellent dispersibility in an aqueous medium and is suitable as an aqueous black ink, such as an inkjet printer ink and a method of producing the same. The carbon black aqueous dispersion includes an aqueous medium and a carbon black pigment dispersed in the aqueous medium, wherein some or all of the hydrogen atoms of the acidic groups produced by liquid-phase oxidation of the carbon black are replaced with a basic amino acid salt group by neutralization with a basic amino acid. The method of producing a carbon black aqueous dispersion includes subjecting carbon black to liquid-phase oxidation, removing reduced salts from the resulting slurry, neutralizing the slurry with a basic amino acid to replace some or all of the hydrogen atoms of the acidic groups with a basic amino acid salt group to form a basic amino acid salt compound, and purifying the resulting product.
A carbon black aqueous dispersion comprising an aqueous medium and a carbon black pigment dispersed in the aqueous medium, wherein some or all of hydrogen atoms of acidic groups produced by liquid-phase oxidation of the carbon black in an ammonium persulfate solution are replaced with a basic amino acid salt group by neutralization with a basic amino acid.
A method of producing a carbon black aqueous dispersion comprising subjecting carbon black to liquid-phase oxidation by adding the carbon black to an aqueous solution of ammonium persulfate to form a mixture, stirring the mixture to form a resulting slurry, removing reduced salts from the resulting slurry, neutralizing the slurry with a basic amino acid to replace some or all of hydrogen atoms of acidic groups with a basic amino acid salt group to form a resulting basic amino acid salt compound product, and purifying the resulting product.
A carbon black aqueous dispersion comprising an aqueous medium and a carbon black pigment dispersed in the aqueous medium, wherein some or all of hydrogen atoms of acidic groups produced by liquid-phase oxidation of the carbon black are replaced with a basic amino acid salt group by neutralization with a basic amino acid selected from the group consisting of L-arginine and histidine.
Dependencies are inferred from the claim text.