Browse Prior Art Database

Acid Neutralized Resistive Ribbon Inks

IP.com Disclosure Number: IPCOM000040437D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Baker, RW: AUTHOR [+3]

Abstract

Resistive ribbon thermal transfer printing employs ribbons having a resistive, support layer, a thin aluminum interlayer, and an ink outer layer, which is transferred by heat generated in the ribbon itself. Metal electrodes, typically of tungsten, contact the resistive layer to provide printing current. U.S. Patent 4,384,797 is illustrative. In such a system neutralizing with citric acid the normally basic status of an ink layer predominantly of polyamide reduces printhead wear. A representative formula by weight of the ink layer is as follows: polyamide 75% to 80%, carbon black 15%, and citric acid 5% to 10%. The polyamide is one or a blend of adhesive-grade polyamides predominantly of a dimer acid (of oleic or linoleic acids) moiety and an ethylene diamine moiety.

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Acid Neutralized Resistive Ribbon Inks

Resistive ribbon thermal transfer printing employs ribbons having a resistive, support layer, a thin aluminum interlayer, and an ink outer layer, which is transferred by heat generated in the ribbon itself. Metal electrodes, typically of tungsten, contact the resistive layer to provide printing current. U.S. Patent 4,384,797 is illustrative. In such a system neutralizing with citric acid the normally basic status of an ink layer predominantly of polyamide reduces printhead wear. A representative formula by weight of the ink layer is as follows: polyamide 75% to 80%, carbon black 15%, and citric acid 5% to 10%. The polyamide is one or a blend of adhesive-grade polyamides predominantly of a dimer acid (of oleic or linoleic acids) moiety and an ethylene diamine moiety. The 5% citric acid is approximately just sufficient to neutralize the basicity of the polyamide. Corrosion of tungsten electrodes which is normally experienced under printing with the basic ink is not experienced when the ink is neutralized by the acid.

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