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    • 64. 发明专利
    • HEAT SENSITIVE RECORDING MATERIAL
    • JPH05221131A
    • 1993-08-31
    • JP32128292
    • 1992-11-05
    • APPLETON PAPER INC
    • DEIIN JII DEIRUBUROTSUKUSU
    • B41M5/333B41M5/337
    • PURPOSE: To improve thermal image response and/or improve resistance to thermal image decline upon exposure to elevated temperature by providing mutually a neighboring relationship between an electron donor type dye precursor, an acidic developing substance, sensitizer, and a complex material formed by adding ammonium hydroxide and zinc stearate and adjusting a predetermined pH value to a supporting medium constituting paper, etc. CONSTITUTION: An electron donor dye precursor constituting a color forming compound of phthalide, for example, an acidic developing substance such as 4,4'-isopropylidine-diphenol(bisphenol A), a sensitizer such as acetoaceto-toluidine, and a complex of ammonia and/or zinc stearate obtained from zinc stearate and ammonium hydroxide are arranged in a substantially neighboring relationship to a supporting medium constituting paper, etc. This ammonium complex of zinc stearate is adjusted by adding a zinc stearate dispersing liquid until a concentrated ammonium hydroxide becomes over pH 10.5. By this composition, resistance to thermal image decline is increased upon exposure to elevated temperature.