Patent GB-1025475-A (GB)
Title: Improvements in or relating to transfer media
IPC: H05F3/02
Filed: 1963-10-22
Abstract: A transfer element comprising a solvent-applied coating on a flexible foundation having a thin metal layer on one surface thereof is produced by a process wherein the metal layer is earthed during the coating operation and during the evaporating operation when the solvent is evaporated to leave a pressure sensitive transfer layer on the foundation, to prevent the accumulation of static electricity on the foundation and thus avoid the danger of fire or explosion being caused by the ignition of the solvent or the products of evaporation thereof.  The foundation may be a film of plastics material and the metal layer e.g. silver, copper, nickel, or chromium, may be vacuum coated thereon to provide a continuous electrically conductive layer throughout the length of the element or web from which the element is formed.  The pressure transferable coating may be applied to one side of the flexible foundation and the metal coating is applied to the other side thereof.  The plastics film may be of polyethylene terephthalate, polyvinyl chloride or fluoride, polyvinylidene chloride, polyethylene, polypropylene, cellulose acetate or regenerated cellulose.  The transferable coating composition may comprise vinyl chloride-vinyl acetate copolymer, mineral oil, carbon black, ethyl acetate and toluol.  The transferable layer may be a squeeze-out type carbon layer as defined in Specification 941,549 in which the binder material is p  resinous, porous and non transferable while the oil and pigment are squeezed out under imaging pressure to form a copy; more conventional stencilling-type transfer layers of the carbon paper, hectograph and magnetic pigment types in which the binder material may be wax, resin or a mixture thereof as described in Specification 902,528.  An intermediate layer of, for example, a vinyl resin, may be present between the foundation and transfer layer.  As shown, metal coated foundation 2, expended from earthed roll 1, passes over earthed rollers 3, 4 and contacts application roller 5 which is immersed below the surface of ink solution 7 in vat 6. The coated foundation carrying the wet ink composition as layer 8 passes over earthed roller 9 and through heating tunnel 10 where the solvent is evaporated and dry transfer coating 11 is formed.ALSO:A transfer element comprising a solvent-applied coating on a flexible foundation having a thin metal layer on one surface thereof is produced by a process wherein the metal layer is earthed during the coating operation and during the evaporating operation when the solvent is evaporated to leave a pressure sensitive transfer layer on the foundation, to prevent the accumulation of static electricity on the foundation and thus avoid the danger of fire or explosion being caused by the ignition of the solvent or the products of evaporation thereof.  The foundation may be a film of plastics material and the metal layer e.g. silver, copper, nickel, or chromium may be vacuum coated thereon to provide a continuous electrically conductive layer throughout the length of the element or web from which the element is formed.  The pressure transferable coating may be applied to one side of the flexible foundation and the metal coating is applied to the other side thereof.  The plastics film may be of polyethylene terephthalate, polyvinyl chloride or fluoride, polyvinylidene chloride, polyethylene, polypropylene, cellulose acetate or regenerated cellulose.  The transferable coating composition may comprise vinyl chloridevinyl acetate copolymer, mineral oil, carbon black, ethyl acetate and toluol.  The transferable layer may be a squeeze-out type carbon layer as defined in Specification 941,549 in which the binder material is resinous, porous and non transferable while the oil and pigment are squeezed out under imaging pressure to form a copy; more conventional stencilling-type transfer layers of the carbon paper, hectograph and magnetic pigment types in which the binder material may be wax, resin or a mixture thereof as described in Specification 902,528.  An intermediate layer of, for example, a vinyl resin, may be present between the foundation and transfer layer.  As shown, metal coated foundation 2, expended from earthed roll 1, passes over earthed rollers 3, 4 and contacts application roller 5 which is immersed below the surface of ink solution 7 in vat 6. The coated foundation carrying the wet ink composition as layer 8 passes over earthed roller 9 and through heating tunnel 10 where the solvent is evaporated and dry transfer coating 11 is formed.