Water-Dispersed Resistive Ribbon Ink
Original Publication Date: 1986-Mar-01
Included in the Prior Art Database: 2005-Mar-08
Resistive transfer mediums of the general kind described in U.S. Patent 4,320,170 have a resistive layer serving as a substrate to an ink layer, which is a heat-flowable marking material. A very thin layer of aluminum separates the resistive layer and the ink layer. Current is applied to the resistive layer from electrodes in a printhead, and the resulting electrical heating causes the marking material to flow. A water-based ink is employed, containing ammonium abietate, a fugitive base, as a dispersant. A water-based ink eliminates pollution and recovery problems associated with organic solvents. The ink contains dispersed polymers and carbon black. Such water dispersions contain dispersing agents for stabilization. The dispersing agents have no function during use of the ribbon.