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USING POLAR ORGANIC SOLVENTS FOR PURIFICATION AND AQUEOUS INK PREPARATION OF TEXTILE GRADE WATER SOLUBLE DYES

IP.com Disclosure Number: IPCOM000027868D
Original Publication Date: 2001-Jun-30
Included in the Prior Art Database: 2004-Apr-09
Document File: 2 page(s) / 75K

Publishing Venue

Xerox Disclosure Journal

Abstract

Textile grade dyes typically contain significant amounts of excess salts from the dye preparation process. Particularly high-grade dyes are normally utilized to ensure consistently acceptable jetting performance for Thermal Ink Jet (TLT). The cost and availability of these purified dyes is high and limited. An inexpensive process for removal of the bulk salts that renders the dye dissolved in the preferred organic co-solvent for TLT aqueous based inks dissolves the crude dye stuff into neat solvent and collects the dye laden supernatant liquid. Preferred organic solvents include formamide and dimethyl sulfoxide (DMSO). Both cationic and anionic dye types are applicable.

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XEROX DISCLOSURE JOURNAL

USING POLAR ORGANIC SOLVENTS FOR PURIFICATION AND AQUEOUS INK PREPARATION OF TEXTILE GRADE WATER SOLUBLE DYES
Richard L. Colt
Kurt B. Gundlach
Luis A. Sanchez
Gary R. Fague

Proposed Classification
U. S. C1.347/007 Int. C1. B41j 02/195

Textile grade dyes typically contain significant amounts of excess salts from the dye preparation process. Particularly high-grade dyes are normally utilized to ensure consistently acceptable jetting performance for Thermal Ink Jet (TLT). The cost and availability of these purified dyes is high and limited. An inexpensive process for removal of the bulk salts that renders the dye dissolved in the preferred organic co-solvent for TLT aqueous based inks dissolves the crude dye stuff into neat solvent and collects the dye laden supernatant liquid. Preferred organic solvents include formamide and dimethyl sulfoxide (DMSO). Both cationic and anionic dye types are applicable.

Thus, it is disclosed to inexpensively produce quality aqueous based TIJ inks from impure ionic dyestuff. The purification and formulation of aqueous based inks with ionic dyes is realized through the utilization of polar organic solvents. Exemplary ink includes:

Sevron@ Yellow GLCN 200% (2 grams approximately 50% dye) slurried in formamide (1 8 grams). The salt settles by gravity or centrifuge. The supernate, which contains the purified dye, is drawn off and filtered leaving behind salt impurities (approximately 1 gram). The formamide dye mi...