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TIJ INK COMPOSITIONS WITH IMPROVED LATENCY

IP.com Disclosure Number: IPCOM000026777D
Original Publication Date: 1993-Aug-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 4 page(s) / 286K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is the use of dye mixtures to improve the latency of thermal ink jet (TIJ) inks. Black TIJ inks were prepared from mixtures of Direct Black 168 and Direct Blue 199. At a constant dye concentration, inks containing cyan colorants were found to have improved or longer latency. The use of cyan does change the hue and optical density of the resulting ink but the inks satisfy latency requirements. The use of Direct Blue 199 and Direct Black 168 based inks enable the preparation of inks meeting the requirements of waterfastness and latency for certain modern high speed low volume TIJ printers. Traditional approaches to improved ink latency have been to: add large amounts of humectants to the ink; to add additives to the ink which improve the solubility of the dye in the water cosolvent ink mixture; and to reduce the concentration of dye.

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XEROX DISCLOSURE JOURNAL

TIJ INK COMPOSITIONS WITH IMPROVED LATENCY U.S. C1.355/256 Marcel P. Breton
Barbel Helbrecht
Toshitake Yui

Proposed Classification

Int. C1. G03g 15/10

Disclosed is the use of dye mixtures to improve the latency of thermal ink jet (TIJ) inks. Black TIJ inks were prepared from mixtures of Direct Black 168 and Direct Blue 199. At a constant dye concentration, inks containing cyan colorants were found to have improved or longer latency. The use of cyan does change the hue and optical density of the resulting ink but the inks satisfy latency requirements. The use of Direct Blue 199 and Direct Black 168 based inks enable the preparation of inks meeting the requirements of waterfastness and latency for certain modern high speed low volume TIJ printers. Traditional approaches to improved ink latency have been to: add large amounts of humectants to the ink; to add additives to the ink which improve the solubility of the dye in the water cosolvent ink mixture; and to reduce the concentration of dye.

To demonstrate TIJ inks with improved latency a series of inks were prepared containing Sumitomo and/or ICI Direct Black 168, and ICI Project cyan (Direct Blue 199), 0.03% polyethyleneoxide (MW = 18,500) in an ink vehicle consisting of water, ethylene glycol and isopropanol.

INK 1: A TIJ ink was prepared by dissolving 3.1% by weight of Sumitomo Direct Black 168 and 0.9% by weight of Direct Blue 199 (ICI) in a vehicle which was composed of 20% by weight of ethylene glycol, 3.5% by weight of isopropanol and 72.5% by weight of water. The ink was filtered through a 0.45 micron filter and then printed on a Hewlett-Packard Desk Jet printer. Latency, waterfastness and linewidth were measured. The latency at 15% RH was 40 seconds. On Hammermill Fore DP (20 lbs.) paper stock, the waterfastness was 78.2% and the 3 pixel average linewidth was 278 microns (wire side). The waterfastness was obtained by measuring the optical density of a dry solid area prior to and after soaking the image in deionized water for a period of 2 minutes.

XEROX DISCLOSURE JOURNAL - VO~. 18, NO. 4 July/August 1993 415

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TIJ INK COMPOSITIONS WITH IMPROVED LATENCY (Cont'd)

INK 2: A TIJ was prepared by dissolving 2.5% by weight of Sumitomo Direct Black 168 and 0.5% by weight of Direct Blue 199 (ICI) in a vehicle which was composed of 20% by weight of ethylene glycol, 3.5% by weight of isopropanol and 73.5% by weight of water. The ink was filtered through a 0.45 micron filter and then printed on a Hewlett-Packard Desk Jet printer. The latency at 15% RH was 150 seconds. On Hammermill Fore DP paper stock, the waterfastness was 82.2% and the 3 pixel average linewidth was 309.8 microns (wire side). The waterfastness was obtained as above.

INK 3: A TIJ was prepared by dissolving 3.1% by weight of Sumitomo Direct Black 168 and 0.9% by weight of Direct Blue 199 (ICI) in a vehicle which was composed of 1...