Reduction of Friction of Thermal Printing
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
Thermally printed ink may have a high coefficient of friction which causes unsatisfactory document feed over the glass of photocopiers and the like. This is eliminated by encapsulating a lubricant, preferably dimethyl siloxane oil of 500 cs viscosity, in microspheres having outer shells which are opened by the heat of printing. These spheres are incorporated in a thin, low melting release layer on the aluminum coating of a support layer. The ink layer is on the opposite side of the release layer. The shell material has a discrete melting point. The shell material preferably is gelatin. Waxes, predominantly polyolefin resins, and polymers, such as ethylene-vinyl acetate co-polymers, are satisfactory. Microcapsules of this kind may be commercially obtained in diameters of 1 to 10 microns.