Glutaric Acid-Neutralized Resistive Ribbon Inks
Original Publication Date: 1988-Nov-01
Included in the Prior Art Database: 2005-Feb-15
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 glutaric 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 79%, carbon black 15%, and glutaric acid 6%. 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.