Method for forming an aqueous carbon black dispersion

A method for forming an aqueous carbon black dispersion including providing a reaction mixture including carbon black having a DBP uptake of greater than 90 cc/100 g of the carbon black, a monovalent ion persulfate, an aqueous medium, and, in some embodiments, a strong acid; subjecting the reaction...

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Bibliographische Detailangaben
Hauptverfasser:	LANGENMAYR ERIC JON, CHAMPLIN TABB ROBERTSON, WU RICHARD SHU-HUA, CRESCIMANNO STEPHEN ANDREW
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COLOUR PRINTING CORRECTING FLUIDS CORRECTION OF TYPOGRAPHICAL ERRORS DYES FILLING PASTES i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME INKS LINING MACHINES METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PERFORMING OPERATIONS POLISHES PREPARATION OF CARBON BLACK PRINTING PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES SELECTIVE PRINTING MECHANISMS STAMPS TRANSPORTING TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES TYPEWRITERS USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	A method for forming an aqueous carbon black dispersion including providing a reaction mixture including carbon black having a DBP uptake of greater than 90 cc/100 g of the carbon black, a monovalent ion persulfate, an aqueous medium, and, in some embodiments, a strong acid; subjecting the reaction mixture to a first temperature of from 40° C. to 90° C. for from 2 hours to 24 hours; neutralizing the reaction mixture to a pH greater than 7.0, and, in certain embodiments, subjecting the neutralized reaction mixture to a second temperature of from 20° C. to 40° C. higher than the first temperature for from 2 hours to 12 hours is provided. In an alternative aspect carbon black having a particle diameter less than 18 nanometers in diameter and a DBP uptake of less than 70 cc/100 g carbon black is provided. The aqueous carbon black dispersion so formed and an aqueous inkjet ink containing the aqueous carbon black dispersion are also provided.