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    • 3. 发明专利
    • THERMAL PHOTOSENSITIVE COLORING COMPOSITION
    • JPH03159783A
    • 1991-07-09
    • JP30010689
    • 1989-11-17
    • TATEYAMA KAGAKU KOGYO KK
    • DOI SADAHOTTA TAKAAKIHONDA KENICHI
    • B41M5/26G03C1/675G03C1/73
    • PURPOSE:To obtain a thermal photosensitive coloring composition with high usefulness and capable of a long-term storage also under an ordinary light by dispersing and mixing a pulverized photoactivator having the specific melting point selected from aromatic phosphonium organic acid salts, aromatic oxonium organic acid salts and aromatic iodonium organic acid salt in a polymer aqueous solution. CONSTITUTION:As a photoactivator, a compound having the melting point from 70 deg.C to 300 deg.C out of compounds consisting of aromatic phosphonium organic acid salts, aromatic oxonium organic acid salts and aromatic iodonium organic acid salts is selected and pulverized, further an electron donative coloring organic compound to be combined with the former compound is also pulverized, and both compounds are dispersed and mixed in a polymer aqueous solution. In place of the polymer aqueous solution, also, the organic solvent-dissolved liquid of at least one of the photoactivator and electron donative coloring organic compound is accommodated in a microcapsule and then both are dispersed and mixed to obtain the same result.
    • 5. 发明专利
    • THERMAL RECORDING PAPER CAPABLE OF RECORDING LATENT CHARACTERS
    • JPH0358892A
    • 1991-03-14
    • JP19516389
    • 1989-07-27
    • TATEYAMA KAGAKU KOGYO KK
    • DOI SADAHOTTA TAKAAKIHONDA KENICHI
    • B42D15/00B32B7/02B32B29/06
    • PURPOSE:To maintain secrecy of information, by providing a thermal color forming layer capable of forming a color according to information under high-energy printing heat, and a photosensitive color forming layer in which information can be latently recorded both under high-energy printing heat and under low-energy printing heat and in which the information is converted into a permanent, sensible developed color state upon irradiation with light from a light source, on an upper surface of a support such as a paper. CONSTITUTION:A thermal color forming layer 2 capable of forming a color according to information under high-energy printing head is provided on an upper surface of a support 1 such as a paper for printing thereon by a thermal printer. On the layer 2 is provided a photosensitive color forming layer 3 in which information can be latently recorded both under high-energy printing heat and under low-energy printing heat and in which the information is developed into a color upon irradiation with light from a light source. By separating a region for using the high-energy printing heat and a region for using the low-energy printing heat, it is possible to obtain an exposed information part and a hidden information part. Therefore, the secrecy of information sent to a receiver can be maintained, and the information can be read by only a specified person to whom the information is destined.