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Two-color-thermosensitive-recording-adhesive-label

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Two-color thermosensitive recording adhesive label

Details

Inventors: Iiyama, Kiyotaka; Inaba, Norihiko;
Assignee: Ricoh Company, Ltd. (Tokyo, JP)
Primary Examiner: Hess; Bruce H.
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Fisher, Spivak, McClelland, & Maier

A two-color thermosensitive recording adhesive label comprising a support material, a first lower thermosensitive coloring layer and a second upper thermosensitive coloring layer supported on the support material, capable of yielding two different colors, with the coloring temperature for the second thermosensitive coloring layer being lower than that for the first thermosensitive coloring layer, in which at least the second thermosensitive coloring layer contains a basic leuco dye and a color developer capable of inducing color formation in the leuco dye upon application of thermal energy, and a decolorizing agent for decoloring the color developed in the second thermosensitive coloring layer at the time of color development of the first thermosensitive coloring layer is contained in the first thermosensitive coloring layer or in a decolorizing intermediate layer interposed between the first thermosensitive coloring layer and the second thermosensitive layers, which decolorizing agent is selected from particular piperazine derivatives and a compound having three or more amide groups and a compound having two or more amide groups and one or more tertiary amine groups as defined in the claims.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific examples of the piperazine derivative having the formula (I) are as follows: N-methyl-N'-phenylacetylpiperazine, N-propyl-N'-phenylacetylpiperazine, N-propyl-N'-benzoylpiperazine, N-butyl-N'-benzoylpiperazine, N-cyclohexyl-N'-benzoylpiperazine, N-hexyl-N'-benzoylpiperazine, N-lauryl-N'-benzoylpiperazine, N-stearyl-N'-benzoylpiperazine, N-phenyl-N'-benzoylpiperazine, N-benzyl-N'-benzoylpiperazine, N-phenyl-N'-cyclohexyloylpiperazine, N-phenyl-N'-acetylpiperazine, N-phenyl-N'-lauroylpiperazine, N-phenyl-N'-p-methylbenzoylpiperazine, N-phenyl-N'-p-chlorobenzoylpiperazine, N-benzoylaminoethyl-N'-benzoylpiperazine, N-benzoylaminopropyl-N'-benzoylpiperazine, N-benzoylaminobutyl-N'-benzoylpiperazine, N-benzoylaminopropyl-N'-cyclohexylpiperazine, N-cyclohexyloylaminopropyl-N'-cyclohexyloylpiperazine, N-benzoylaminoamyl-N'-benzoylpiperazine, N-(p-chlorobenzoylaminoamyl)-N'-(chlorobenzoyl)-piperazine, N-phenyl-N'-benzenesulfonylpiperazine, N-benzyl-N'-benzenesulfonylpiperazine, N-methyl-N'-benzenesulfonylpiperazine, N-propyl-N'-benzenesulfonylpiperazine, N-butyl-N'-benzenesulfonylpiperazine, N-hexyl-N'-benzenesulfonylpiperazine, N-cyclohexyl-N'-benzenesulfonylpiperazine, N-lauryl-N'-benzenesulfonylpiperazine, N-stearyl-N'-benzenesulfonylpiperazine, N-phenyl-N'-butylsulfonylpiperazine, N-phenyl-N'-laurylsulfonylpiperazine, N-phenyl-N'-stearylsulfonylpiperazine, N-phenyl-N'-cyclohexysulfonylpiperazine, N-phenyl-N'-benzylsulfonylpiperazine, N-phenyl-N'-(p-methylbenzenesulfonyl)piperazine, N-butyl-N'-(p-methylbenzenesulfonyl)piperazine, N-benzoylaminopropyl-N'-benzenesulfonylpiperazine, N-benzoylaminopropyl-N'-p-methylbenzenesulfonylpiperazine, N-benzoylaminoethyl-N'-benzenesulfonylpiperazine, N-benzoylaminobutyl-N'-benzenesulfonylpiperazine, N-benzoylaminopropyl-N'-butanesulfonylpiperazine, N-naphthoylaminopropyl-N'-benzenesulfonylpiperazine, N-benzenesulfonylaminopropyl-N'-benzenesulfonylpiperazine, N-butyroylaminopropyl-N'-benzoylpiperazine, N-hexyloylaminopropyl-N'-benzoylpiperazine, N-lauroylaminopropyl-N'-benzoylpiperazine, N-stearoylaminopropyl-N'-benzoylpiperazine, and N-stearoylaminopropyl-N'-benzenesulfonylpiperazine

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