Thermal Transfer Ink With Heat-Degradable Sugar
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Thermal transfer inks which flow under heat to effect printing are enhanced with a sugar which degrades at the printing temperatures. The carbon dioxide and water given off physically promote flow of the ink, and the burned product is compatible in color with a dark ink. Typically a thermal transfer ink is a body of thermoplastic wax or resin or blend of thermoplastic resins filled with carbon black as a pigment to provide the desired dark color. The ink is supported on a substrate which is heated. In resistive ribbon thermal printing, the substrate receives electrical current and the heat is produced in the substrate. Sugar is dispersed thoroughly through the ink in small amounts relative to the other body and the pigment. Typical sugars are sucrose, fructose, lactose, and maltose.