Abstract: In an electrothermic non-impact image transfer recording material for use in an electrothermic non-impact recording method in which the electrothermic non-impact image transfer recording material is superimposed on a recording sheet, a recording electrode with multiple recording styli and a return electrode are placed in contact with the recording material, and image-delineating signal voltage is applied across the recording material through the recording electrode and the return electrode, so that an ink is transferred imagewise from the recording material to the recording sheet, the improvement wherein the electrothermic non-impact image transfer recording material comprises a base layer and an ink layer, with an intermediate layer interposed between the two layers when necessary, and the base layer comprises as the main components a polyamide resin binder, such as an aromatic polyamide or nylon, and carbon black.

Abstract: In a non-impact recording apparatus comprising (i) a recording head comprising (a) a recording electrode consisting essentially of a plurality of recording styli, and (b) a return electrode, which are embedded in an electrically insulating support member, and (ii) an image-delineating signal application apparatus which applies image-delineating electric current between selected recording styli and the return electrode so as to generate Joule's heat in the portions in an ink ribbon containing an electroconductive thermo-fusible ink material immediately below the recording styli and to soften the ink material, thereby transferring the softened or fused ink material in image patterns to a recording medium, the improvement wherein, on the side of the recording head in contact with the surface of the ink ribbon, there is formed a groove portion out of contact with the surface of the ink ribbon between the recording electrode and the return electrode, thereby preventing the deposition of a layer of the electrocondu

Abstract: An ink ribbon for use in electrothermic non-impact recording comprising an electroconductive base layer and an electroconductive thermal-transferable ink layer which are layered. The base layer comprises a binder resin and an electroconductive material dispersed uniformly in the binder resin, while the electroconductive thermal-transferable ink layer comprises a thermoplastic material and an electroconductive material uniformly dispersed in the thermoplastic material, with the surface resistivity .rho.b of the base layer being greater than the surface resistivity .rho.i of the ink layer, and the softening or melting point Tm1 of the binder resin in the base layer being higher than the softening or melting point Tm2 of the thermoplastic material in the ink layer.

Abstract: A non-impact recording method and apparatus capable of printing with electroconductive thermal-transferable ink on a receiving surface, with uniform image density and high resolution, and with minimum energy consumption, by embodying the steps of superimposing on a receiving surface of a recording sheet an ink ribbon comprising an electroconductive thermal-transferable ink material; placing a recording electrode having a plurality of recording styli in contact with the ink ribbon, and a return electrode in contact with the ink ribbon, the return electrode disposed at a predetermined distance from the recording electrode, substantially parallel to the recording electrode, with the contact areas with the ink ribbon of the recording electrode being smaller than the contact area with the ink ribbon of the return electrode, which predetermined distance is in the range of 2.times.d.ltoreq.Lm.ltoreq.200.times.

Abstract: Electrothermic non-impact recording method and apparatus capable of printing with electroconductive thermal-transferable ink on a recording medium by reciprocating a recording head relative to the recording medium, which recording head comprises (i) a plurality of recording styli and (ii) a return electrode in contact with an electroconductive ink ribbon comprising a thermal-transferable ink material, the ink ribbon being in contact with a receiving surface of a recording medium; by applying between selected recording styli and the return electrode an image-delineating electric current, through resistor elements, each of which is connected between each of the recording styli and each of the output terminals from which the image-delineating electric current is output, the resistance of each resistor element being in the range of 1/10 to 10 times the resistance of the portion of the ink ribbon between each recording stylus and the return electrode, thus causing the image-delineating electric current to flow thr

Abstract: An electric ink transfer recording method for obtaining a recorded matter which comprises putting a sheet to be recorded and an ink sheet generating Joule's heat when electrified and having a thermo-melting ink layer together; applying electricity to said ink sheet by contacting a return circuit electrode with the ink sheet and a recording electrode needle (stylus) with the surface of the ink sheet and impressing pulse voltage thereupon; and transferring the ink from the ink sheet to the sheet to be recorded, characterized in that an insulating liquid is interposed between the ink sheet and the recording electrode needle when obtaining the recorded matter.

Abstract: This invention provides a liquid developer for use in electrophotography which comprises a dispersion of toner particles in a carrier liquid having a high resistivity and a low dielectric constant and is superior in fixability, dispersion stability and redispersability, said toner particles consisting essentially of pigment or dye particles and a non-aqueous dispersion of thermoplastic resinous composition comprising a graft-copolymer and at least one substance selected from wax the groups consisting of polyethylene.

Abstract: Liquid developers for use in electrostatic photography in which toner particles comprising pigment and specific polymer mixes having a particle size of from 0.2 to 0.8 .mu., and a particle size distribution such that about 90% of the particles are in the particle size range of from 0.3 to 0.6 .mu., are dispersed in a petroleum aliphatic hydrocarbon solvent having a solubility parameter of from 7.0 to 7.5, and method of preparation.

Abstract: Negatively charged liquid developers for use in electrostatic photography which comprises a highly insulating carrier liquid and, dispersed therein, a toner comprising colored particles coated with a synthetic polymer composition which is a mixture of vinyltoluene-butadiene or styrene-butadiene reaction products with acrylic and methacrylic acid and alkyl esters of such acids wherein the alkyl group contains 6 to 18 carbon atoms.