Abstract: In order to promote tearing in a clean line of an adhesive film applied by a hand-held device to a substrate by unrolling an adhesive tape from a roller, pressing the tape against the substrate and winding up the carrier of the tape after the adhesive film is stripped therefrom, alginic acid in finely divided form is provided in the adhesive film.

Abstract: A thermal transfer meltable color layer receives a protective polymer coating on the side thereof, to be contacted with the thermal printing head to hold the meltable color material away from the printing head, thereby forming a thermal printing ribbon without the need for a support foil.

Abstract: A thermocolor ribbon, especially a thermocarbon ribbon has a wax and/or plastic binder which melts at a thermal printer temperature to transfer the melt color layer consisting of that binder and polymer particles containing a coloring agent embedded in that binder. The polymer particles melt at a higher temperature to which the thermal print symbol is subjected, e.g. by radiant heating, to fix the image and distribute the coloring agent of the particles in the entire symbol transferred.

Abstract: A thermal printing ribbon is made from an aqueous dispersion of a thermal plastic binder and particles of a wax component, fat-soluble dyestuff and a pigment so that these particles are found side by side in the interstices of a skeleton or matrix formed by a thermoplastic. The thermal printing ribbon has a multistrike capacity.

Abstract: The color transfer density of a thermocarbon ribbon can be improved by forming the wax phase of a melt color layer of such a ribbon so that it contains a paraffin with a hardening temperature of about 50 to 110.degree. C. and at least one ethylene-vinylacetate wax forming a eutectic with a paraffin.

Abstract: A release layer effective for both wax-bonded and plastic-bonded or wax and plastic-bonded melt color layers is provided in a thermocolor, e.g. thermocarbon, ribbon in the form of a substance capable of splitting off water at the thermal printing temperature dispersed in a binder.

Abstract: A thermal transfer meltable color layer receives a protective polymer coating on the side thereof, to be contacted with the thermal printing head to hold the meltable color material away from the printing head, thereby forming a thermal printing ribbon without the need for a support foil.

Abstract: A thermal transfer ribbon, suitable for printing of multiple sharp impressions, employs as the binder for its fusible colorant layer an olefin/vinyl ester copolymer, particularly an ethylene/vinyl acetate copolymer having the ratio of vinyl acetate units to ethylene units of about 0.01 to 0.07. The ribbon is conveniently made by coating a solution of this polymer, with the colorant substance dissolved or dispersed therein, onto a substrate such as a synthetic polyester film.

Abstract: An aqueous ink eradicator solution for inks utilizing triaryl methane dyestuff and containing a reducing sulfur compound. the ink contains 20 to 50% by weight of sugar and/or a solid sugar alcohol and the reducing sulfur compound in an amount of 0.5 to 5% by weight.

Abstract: The reflectivity and shininess of print applied in a thermal-printing process using a thermocolor or thermocarbon ribbon can be reduced by providing a nonmeltable intermediate organic layer between the thermocolor transfer layer and the carrier which comprises a water-soluble material in the form of an aminoplast, a starch or cellulose derivative or a polymer such as polyvinylpyrrolidone, polyvinylalcohol, polyacrylate or polymethylacrylate.

Abstract: A thermocarbon ribbon having a foil-type carrier and a color transfer layer or melt color has its adhesion for the the paper substrate increased by an adhesion coating applied to the color transfer layer. The adhesion layer consists of a parafin wax matrix in which a sticky hydrocarbon resin is dispersed in finely divided form so that during printing, when the temperature of the adhesion layer is raised, the paraffin wax melts, dissolves the finely divided hydrocarbon resin and allows the sticky characteristic of the latter to increase adhesion of the color transfer material to the paper.

Abstract: A thermocarbon ribbon is formed by emulsifying two mutually incompatible thermoplastic polymers melting at heat-transfer temperatures of a wax. The emulsion containing a pigment is applied to a ribbon support and the solvent is evaporated. The ribbon has multi-strike capabilities and improved sharpness of transfer to rough paper resulting from the presence in the solid continuous phase of beads or microspheres of a dispersed phase, both phases being formed by the polymers.

Abstract: A thermocarbon ribbon is formed by emulsifying two mutually incompatible thermoplastic polymers melting at heat-transfer temperatures of a wax. The emulsion containing a pigment is applied to a ribbon support and the solvent is evaporated. The ribbon has multi-strike capabilities and improved sharpness of transfer to rough paper resulting from the presence in the solid continuous phase of beads or microspheres of a dispersed phase, both phases being formed by the polymers.

Abstract: A reusable thermocolor ribbon for thermal transfer printing is described comprising a layer of a melt-applied color on one side of a plastic foil as carrier, where the melt-applied color contains a wax or wax-like substance, a pigment and an organic binder. A coating liquid which contains a thermoplastic binding agent in solution and the meltable wax or wax-like substance in finely dispersed solid form, is applied to the carrier of the thermocolor ribbon, where the coating liquid represents as solvent agent a mixture of a solvent and non-solvent for the thermoplastic binding agent at room temperature. The non-solvent/solvent mixture is evaporated while simultaneously its solvent capability for the plastic binding agent is reduced. This thermocolor ribbon can be used more than 20 times without impairment of the print quality. A process for preparing the thermocolor ribbon is also detailed herein.

Abstract: A thermal transfer ribbon consisting of a color-transfer layer on a foil or film substrate band is provided with a wax coating which appears to facilitate transfer with high resolution even to rough papers.

Abstract: A thermocolor ribbon comprises a plastic support foil, a fusible color layer attached to one side of the plastic support foil and an organic coating layer covering the other side of the plastic support foil. The organic coating layer is composed of a nonfibrous, pressure-stable wax or waxlike substance. A process for making the thermocolor ribbon from a plastic support foil having a fusible color layer thereon comprises application of a solution containing an organic coating material to the side of the foil not having the fusible color layer bonded thereto, followed by solvent evaporation. Alternatively, the side of the support foil bearing the fusible color is brought into intimate contact with opposite side of the foil whereupon the latter is heated for a time sufficient for transport of material from the fusible color layer to the uncoated side of the foil to form the organic coating layer thereon.

Abstract: A thermocolor ribbon comprises a plastic support foil, a fusible color layer attached to one side of the plastic support foil and an organic coating layer covering the other side of the plastic support foil. The organic coating layer is composed of a nonfibrous, pressure-stable wax or waxlike substance. A process for making the thermocolor ribbon from a plastic support foil having a fusible color layer thereon comprises application of a solution containing an organic coating material to the side of the foil not having the fusible color layer bonded thereto, followed by solvent evaporation. Alternatively, the side of the support foil bearing the fusible color is brought into intimate contact with opposite side of the foil whereupon the latter is heated for a time sufficient for transport of material from the fusible color layer to the uncoated side of the foil to form the organic coating layer thereon.

Abstract: A transparent image sheet carrier for overhead-projection systems is described based upon a dark-tone colored field with image markings in bright-tone contrasting colors, including a sheet bearing a layer containing at least one acid-resistant dye for imparting the dark-tone color to the field; the dye may be discharged in the locale of the image markings by a discharge device with a simultaneous appearance in the image locale of the bright-tone contrasting color.