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US 4,665,410 AGranted
Multi-color thermosensitive recording material
AssigneeRicoh Company, Ltd.
InventorsKiyotaka Iiyama, Norihiko Inaba
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AssigneeRicoh Company, Ltd.
InventorsKiyotaka Iiyama, Norihiko Inaba
Estimating the term…
A multi-color thermosensitive recording material comprising a support material, three or more thermosensitive coloring layer successively overlaid thereon and decolorizing intermediate layers interposed between the thermosensitive coloring layers, with at least the thermosensitive coloring layers except the thermosensitive coloring layer adjacent to the support material each comprising a basic leuco dye and a color developer capable of inducing color formation in the leuco dye upon application of thermal energy at a predetermined temperature, and each decolorizing intermediate layer containing a decolorizing agent which is capable of decolorizing the color developed in the thermosensitive coloring layer adjacent to the decolorizing intermediate layer when heated to a higher temperature than the predetermined coloring temperature for the thermosensitive coloring layer, which decolorizing agent for use in at least one of the decolorizing layers is (i) a N,N'-disubstituted aromatic diamide compound, (ii) a piperazine compound having at least two amido groups or (iii) a combination of the two compounds.
A multi-color thermosensitive recording material comprising a support material, at least threee thermosensitive coloring layers successively overlaid thereon, each coloring layer being capable of yielding a different color by application of a different quantity of thermal energy thereto, the required energy increasing toward the support and decolorizing intermediate layers interposed between said thermosensitive coloring layers, and wherein at least the thermosensitive coloring layers except the thermosensitive coloring layer adjacent to said support material each comprise a basic leuco dye and a color developer capable of inducing color formation in said leuco dye upon application of thermal energy at a predetermined temperature, and each decolorizing intermediate layer comprises a decolorizing agent which is capable of decolorizing the color developed in the thermonsensitive coloring layer overlaid on the decolorizing intermediate layer when heated to a higher temperature than the predetermined coloring temperature for the thermosensitive coloring layer, said decolorizing agent being selected from the group consisting of:
A multi-color thermosensitive recording material comprising a support material, at least three thermosensitive coloring layers successively overlaid thereon, each coloring layer being capable of yielding a different color by application of a different quantity of thermal energy thereto, the required energy increasing toward the support, and decolorizing intermediate layes interposed between said thermosensitive coloring layers, and wherein at least the thermosensitive coloring layers except the thermosensitive coloring layer adjacent to said support material each comprise a basic eluco dye and a color developer capable of inducing color formation in said leuco dye upon application of thermal energy at a predetermined temperature, and each decolorizing intermediate layer comprises a decolorizing agent which is capable of decolorizing the color developed in the thermosensitive coloring layer overlaid on the decolorizing intermediate layer when heated to a higher temperature than the predetermined coloring temperature for the thermosensitive coloring layer, said decolorizing agent being selected from the group consisting of a:
A multi-color thermosensitive recording material comprising a support material, at least three thermosensitive coloring layers successively overlaid thereon, each coloring layer being capable of yielding a different color by application of a different quantity of thermal energy thereto, the required energy increasing toward the support, and decolorizing intermediate layers interposed between said thermosensitive coloring layers, and wherein at least the thermosensitive coloring layers except the thermosensitive coloring layer adjacent to said support material each comprise a basic leuco dye and a color developer capable of inducing color formation in said leuco due upon application of thermal energy at a predetermined temperature, and each decolorizing intermediate layer comprises a decolorizing agent which is capable of decolorizing the color developed in the thermosensitive coloring layer overlaid on the decolorizing intermediate layer when heated to a higher temperature than the predetermined coloring temperature for the thermosensitive coloring layer, said decolorizing agent being selected from the group consisting of:
Dependencies are inferred from the claim text.