Incremental printing of symbolic information – Thermal marking apparatus or processes – Multicolor
Patent
1994-11-09
1995-07-11
Tran, Huan H.
Incremental printing of symbolic information
Thermal marking apparatus or processes
Multicolor
3461351, 347221, B41M 526, B41J 232, B41J 2435, B41J 2475
Patent
active
054325340
ABSTRACT:
A reversible thermosensitive coloring composition is composed of (i) an electron-donor coloring compound and (ii) an electron-acceptor compound selected from the group consisting of an organic phosphoric acid compound, an aliphatic carboxylic acid, and a phenolic compound, each having a straight chain or branched chain alkyl group or alkyenyl group having 12 or more carbon atoms, the electron-donor coloring compound and the electron-acceptor compound being capable of reacting to induce color formation in the reversible thermosensitive coloring composition at the eutectic temperature thereof. The electron-donor coloring compound and the electron-acceptor compound, when fused and colored in a mixed state, with application of heat thereto, followed by rapidly cooling the fused mixture, exhibit an exothermic peak in a temperature elevation process in a differential scanning calorific analysis or in a differential thermal analysis. A recording medium and display medium using the above reversible thermosensitive coloring composition, a recording method of using the recording medium, a display method of using the display medium, a display method of using the display medium, and a display apparatus using the display medium are disclosed.
REFERENCES:
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patent: 5249000 (1993-09-01), Okabe et al.
patent: 5262374 (1993-11-01), Okabe et al.
patent: 5274460 (1993-12-01), Yamada et al.
Ema Hideaki
Goto Hiroshi
Kawamura Eiichi
Kubo Keishi
Kuboyama Hiroki
Ricoh & Company, Ltd.
Tran Huan H.
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