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:
Sep. 10, 1996
Filed:
Dec. 01, 1994
Edward J Radigan, Jr, Hamlin, NY (US);
Richard L Colt, Rochester, NY (US);
Kurt B Gundlach, Pittsford, NY (US);
Miguel A Fontanez, Rochester, NY (US);
Xerox Corporation, Stamford, CT (US);
Abstract
Disclosed are ink compositions comprising water, a colorant, and a phosphite salt of the general formula ##STR1## wherein R, R', R' and R'' can each, independently of each other, be hydrogen, an alkyl group, a substituted alkyl group, an aryl group, or a substituted aryl group. Also disclosed is a process for preparing an ink composition which comprises admixing water, a colorant, a base, and an acid selected from the group consisting of hypophosphoric acid, hypophosphorous acid, alkyl phosphonic acids, aryl phosphonic acids, alkyl phosphinic acids, aryl phosphinic acids, and mixtures thereof, wherein the pH of the ink is adjusted by a process selected from the group consisting of (a) adding the acid to an aqueous solution containing the base, and (b) adding the base to an aqueous solution containing the acid. Further disclosed are ink compositions comprising water, a colorant, and a salt selected from the group consisting of hypophosphate salts, hypophosphite salts, alkyl phosphite salts, aryl phosphite salts, alkyl phosphonite salts, aryl phosphonite salts, and mixtures thereof.