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US 5,128,308 AGranted
Thermal transfer ribbon
AssigneeNCR Corporation
InventorShashi G. Talvalkar
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AssigneeNCR Corporation
InventorShashi G. Talvalkar
Estimating the term…
A thermal transfer ribbon has a substrate, an undercoating which contains thermal reactive materials and leuco dyes, and a thermal transfer coating applied on the undercoating and which contains a mixture of a wax emulsion and a sensible material, the undercoating assiting the transfer of color images of an improved intensity and sharpness to a receiving medium upon the application of heat to the ribbon. The invention also covers incorporation of the leuco dye and a reactant in the functional coating to intensify the transferred image, with or without the presence of sensible materials such as iron oxide or fluroescent dye, to improve the sharpness and the scratch and smear resistance of the transferred image. An alternative to the two coatings is a single coating which includes pigments with sensing characteristics, thermal reactive material, and transfer agents to obtain an improved intensity image.
A thermal transfer ribbon comprising a substrate, a first coating on said substrate and containing essential ingredients which are water based and are thermally reactive for creating color images, and a second coating distal from said substrate and on said first coating and nonintegral therewith and containing essential ingredients which are solvent based and are thermally active for transferring said color images created in said first coating, the ingredients in said first coating comprising a leuco dye and a phenolic resin reacting with each other in the creating of said color images by thermal reaction of said leuco dye and said phenolic resin and such thermal reaction assisting the ingredients in said second coating in transferring said color images onto an image receiving medium upon the application of heat to said ribbon.
A method of making and using a thermal transfer ribbon having a substrate, a first coating on said substrate and a second coating on said first coating, comprising the steps of:
Dependencies are inferred from the claim text.