The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 11, 2006
Filed:
Nov. 03, 2003
Tabb Robertson Champlin, Ambler, PA (US);
Stephen Andrew Crescimanno, Hatfield, PA (US);
Eric Jon Langenmayr, Bryn Mawr, PA (US);
Richard Shu-hua Wu, Fort Washington, PA (US);
Tabb Robertson Champlin, Ambler, PA (US);
Stephen Andrew Crescimanno, Hatfield, PA (US);
Eric Jon Langenmayr, Bryn Mawr, PA (US);
Richard Shu-Hua Wu, Fort Washington, PA (US);
Rohm and Haas Company, Philadelphia, PA (US);
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.