Transfer elements and process for making same
AssigneeColumbia Ribbon & Carbon Mfg. Co., Inc.
InventorsMichael A. Scott, Cathy D. de Fanis
Life of this patent
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Abstract
Pressure-sensitive transfer elements having a plastic film foundation carrying a frangible, opaque, pressure-transfer layer applied by means of a volatile coating vehicle and comprising a solid solution of a fluorescing dye in a resinous binder material, said layer also containing a minor amount by weight of an opaque lamelliform pigment such as a bronze powder. Such transfer elements are adapted to transfer solid images to the surface of a copy sheet, which images fluoresce to provide a relatively uniform or level signal under exposure to ultraviolet light regardless of whether said images are present on differently-colored areas of the copy sheet surface.
Claims15
A pressure-sensitive transfer element adapted to transfer solid, fluorescing images to a copy sheet under the effect of imaging pressure, comprising a smooth, thin plastic film foundation supporting a volatile solvent-applied, complete-transfer imaging layer comprising a synthetic thermoplastic resin binder material which is soluble in the application solvent, from about 0.25% to about 5.0% by weight, based upon the solids content, of a fluorescing dye in the form of a solid solution within said imaging layer and capable of emitting intense radiation within the range of from about 300 m.mu. to about 700 m.mu. when exposed to a light source rich in ultraviolet radiation, and a minor amount by weight of an opaque lamelliform pigment which is present mainly in a surface stratum of said imaging layer and is adapted to mask the color of the surface of said copy sheet to which said images are transferred without preventing said images from fluorescing under the effects of applied radiation.
A method for producing a pressure-sensitive transfer element adapted to transfer solid fluorescing images to a copy sheet under the effect of imaging pressure comprising the steps of:
- (a) preparing a coating composition by dissolving a synthetic thermoplastic resinous binder material and a fluorescing dye in a volatile organic solvent, said dye being capable of emitting intense radiation within the range of from about 300 m.mu. to about 700 m.mu. when exposed to a light source rich in ultraviolet radiation, and mixing therewith from about 0.25% to about 5.0% by weight, based upon the solids content of a lamelliform pigment;
- (b) applying said coating composition as a uniform thin layer to a smooth plastic film foundation, and
- (c) evaporating said volatile organic solvent to form a solid, complete-transfer imaging layer containing said fluorescing dye in the form of a solid solution and containing said lamelliform pigment mainly in a surface stratum as a masking agent which at least partially masks the color of the surface of the copy sheet to which said composition is transferred in image form without preventing the dye in said images from fluorescing under the effects of applied radiation.
Dependencies are inferred from the claim text.