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Browse Prior Art Database

POLYETHYLENE IMINE WATERFAST LIQUID INKS

IP.com Disclosure Number: IPCOM000027107D
Original Publication Date: 1995-Apr-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 127K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed are formulations for aqueous polyethylene imine based inks having improved waterfastness properties for use in high speed, low volume thermal ink jet printers. Ink formulations containing polyethylene imines and derivatives thereof enable inks with substantially lower pH values and superior waterfastness properties. It is believed that a synergistic effect operates to provide the improved observed waterfastness properties observed when the polyethylene imine compounds are used in conjunction with certain dye stuffs, for example, Direct Black 154, and a cosolvent such as sulfolane or pyrollidone, and solvent mixtures thereof.

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XEROX DISCLOSURE JOURNAL

POLYETHYLENE IMINE WATERFAST LIQUID INKS Edward J. Radigan
Louis V. Isganitis
Miguel Fontanez
Richard Colt
Kurt B. Gundlach
Joe R. Weber

Proposed Classification

US. C1.353256 Int. C1. G03g 15/10

Disclosed are formulations for aqueous polyethylene imine based inks having improved waterfastness properties for use in high speed, low volume thermal ink jet printers. Ink formulations containing polyethylene imines and derivatives thereof enable inks with substantially lower pH values and superior waterfastness properties. It is believed that a synergistic effect operates to provide the improved observed waterfastness properties observed when the polyethylene imine compounds are used in conjunction with certain dye stuffs, for example, Direct Black 154, and a cosolvent such as sulfolane or pyrollidone, and solvent mixtures thereof.

EXAMPLES

Drawdown waterfast tests were performed on Courtland 4024 DP paper as a prescreen test to actual thermal ink jet (TIJ) printhead printing. A #8 wire wound drawbar was used to apply a strip of ink down the paper sheet, which is then soaked in agitated deionized water for 5 minutes. Solid area density (SAD) was measured before and after waterfastness testing to determine % or percent waterfastness (WF). A particularly preferred and exemplary ink formulation is shown in the table as I, and which ink has a waterfastness value of 97%. Inks I, II, ID, and rV were compared under identical testing to \ commercial formulation HP DJ-500 available from Hewlett-Packard Corp.

The formulas tested and summarized in the table had the following compositions.

Control (HP DJ-500) is commercially available that contains no polyethylene oxide additives. INK I is a 4 weight percent HPPEI-200 a polyethoxylated ethylene-imine available from Morton Internationals Corp.; 4 weight percent Pylam Direct Black 154 (high purity); 9.5 weight percent sulfolane solvent;
6.9 weight percent 2-pyrrolidone; 1.03 weight percent triethanolamine (TEA); and...