Method for forming an aqueous carbon black dispersion

Details Method for forming an aqueous carbon black dispersion Method for forming an aqueous carbon black dispersion

2006-04-11

2006-04-11

Lorengo, J. A. (Department: 1755)

Compositions: coating or plastic

Coating or plastic compositions

Marking

C106S031600, C106S473000, C106S480000, C423S600000

Reexamination Certificate

active

07025820

ABSTRACT:
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.

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Kuwahara et al.; Studies on Pigment Dispersion in Water. III Wet Oxidation Of Carbon Black And Dispersibility In Water;Dept of Applied Chemistry, Faculty Of Science and Engineering, Kinki University; Coloring Materials (Shokuzai) 45, 181 (1972) (683-642).
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