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WATERFAST INK JET INKS AND IMAGES THEREFROM

IP.com Disclosure Number: IPCOM000027473D
Original Publication Date: 1997-Apr-30
Included in the Prior Art Database: 2004-Apr-08
Document File: 6 page(s) / 231K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a method of using dye-based ionic ink jet inks whereby the ink jet ink becomes substantially waterfast upon application to a print substrate. The method includes treating a print receiving substrate with a precipitant composition and jetting an ionic ink jet ink onto the print substrate. The precipitant composition includes water and an ionic precipitant of opposite ionic charge from the ionic ink jet ink. The print substrate may be treated during formation of the print substrate or after formation of the print substrate and before jetting the ionic ink jet ink onto the print substrate. By this method, the ionic precipitant composition reacts with the oppositely charged ionic ink jet ink to form a precipitant on the print receiving substrate that is substantially waterfast. Thus, a method for obtaining waterfast images from ink jet inks comprises: treating a print substrate with a precipitant composition; and jetting an ionic ink jet ink onto the print substrate, wherein the precipitant composition comprises water and an ionic precipitant of opposite ionic charge from the ionic ink jet ink. The precipitant composition can be, for example, cationic and the ink jet ink is anionic. Alternatively, the precipitant composition can be anionic and the ink jet ink is cationic. The print substrate can be, for example, plain paper, coated paper, transparency, and the like materials. In embodiments, the large cation can be a cationic salt, a phosphonium salt, a sulfonium salt, an ammonium salt, or an aluminum salt. The cationic salt can be comprised of a metal such as iron, aluminum, calcium, zinc, magnesium, barium, tin, and the like.

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XEROX DISCLOSURE JOURNAL

WATERFAST INK JET INKS AND IMAGES THEREFROM U. S. C1. 346/140 Raymond W. Wong
James M. Duff

Proposed Classification

Int. C1. GOlg 15/18

Disclosed is a method of using dye-based ionic ink jet inks whereby the ink jet ink becomes substantially waterfast upon application to a print substrate. The method includes treating a print receiving substrate with a precipitant composition and jetting an ionic ink jet ink onto the print substrate. The precipitant composition includes water and an ionic precipitant of opposite ionic charge from the ionic ink jet ink. The print substrate may be treated during formation of the print substrate or after formation of the print substrate and before jetting the ionic ink jet ink onto the print substrate. By this method, the ionic precipitant composition reacts with the oppositely charged ionic ink jet ink to form a precipitant on the print receiving substrate that is substantially waterfast. Thus, a method for obtaining waterfast images from ink jet inks comprises: treating a print substrate with a precipitant composition; and jetting an ionic ink jet ink onto the print substrate, wherein the precipitant composition comprises water and an ionic precipitant of opposite ionic charge from the ionic ink jet ink. The precipitant composition can be, for example, cationic and the ink jet ink is anionic. Alternatively, the precipitant composition can be anionic and the ink jet ink is cationic. The print substrate can be, for example, plain paper, coated paper, transparency, and the like materials. In embodiments, the large cation can be a cationic salt, a phosphonium salt, a sulfonium salt, an ammonium salt, or an aluminum salt. The cationic salt can be comprised of a metal such as iron, aluminum, calcium, zinc, magnesium, barium, tin, and the like. In other embodiments, the large cation can be a mono-, di-, tri-, and tetra-alkyl ammonium, phosphonium or arsonium halides, where the alkyl represents groups containing from 1 to about 18 carbon atoms and halide represents chlorine or bromine; mono-, di-, tri- and tetra-aryl ammonium, phosphonium and arsonium halides, where aryl denotes phenyl and substituted phenyl; mono-, di-, tri-, and tetra- aralkylammonium, phosphonium and arsonium halides, where aralkyl denotes groups such as benzyl, phenethyl and the like; and mixed di-, tri- and tetra-substituted ammonium, phosphonium and arsonium halides, wherein the substituents can be mixtures of the aforementioned alkyl, aryl and aralkyl groups; or mixtures thereof. The large cation can be a multiple charged, complex haloaluminum hydrate, such as chlorhydrol or bromhydrol.

XEROX DISCLOSURE JOURNAL - Vol. 22, NO. 2 M~cNApril1997 65

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WATERFAST INK JET INKS AND IMAGES THEREFROM (CONT'D)

ExamDle A

Solution 1: a cationic solution containing 5% by weight of solution of chlorohydrol (available from Reheis Chemical) and 5% by weight of...