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US 5,248,652 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 assisting 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 and a coating on said substrate containing essential ingredients which are waterbased and are thermally reactive for creating color images, said coating further containing ingredients which are also water-based and are thermally active for thermally transferring said created color images onto an image receiving medium, said thermally reactive ingredients 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 thermally active ingredients in the transfer of said image onto said medium upon the application of heat to said ribbon.
A method of making and using a thermal transfer ribbon having a substrate and a coating on said substrate, comprising the steps of:
Dependencies are inferred from the claim text.