THERMAL HISTORY DISPLAY MATERIAL

PROBLEM TO BE SOLVED: To provide a thermal history display material capable of accurately displaying the thermal history (temperature - time history) of an article by hue change.SOLUTION: The thermal history display material includes, in the following sequence: a thermal history display layer 20 in...

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Bibliographische Detailangaben
Hauptverfasser: NISHIDA MITSUO, TSUJII YASUTO, TOGAWA KEIICHIRO
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a thermal history display material capable of accurately displaying the thermal history (temperature - time history) of an article by hue change.SOLUTION: The thermal history display material includes, in the following sequence: a thermal history display layer 20 in which an associative fluorescent dye having a fluorescent wavelength differing between an excimer state and a monomer state is fixed in a specific molecular dispersion state; and a first coating layer 10 disposed on one main surface of the thermal history display layer 20. The thermal history display layer 20 is a layer that discolors to a hue different from an initial hue when it is kept at a specific temperature or more at a certain time or more. The water vapor permeability of the first coating layer 10 is 1.0 g/mday atm or less at 40°C and at a relative humidity of 90%. 【課題】色相変化によって、物品の熱履歴(温度−時間経歴)を正確に表示することのできる熱履歴表示材を提供する。【解決手段】エキシマー状態とモノマー状態とで異なる蛍光波長を有する会合性の蛍光染料が特定の分子分散状態で固定されている熱履歴表示層20と、熱履歴表示層20の一方の主面上に配置される第1の被覆層10とをこの順に含み、熱履歴表示層20は、特定温度以上の温度で一定時間以上保持されたときに、初期の色相とは異なる色相に変色する層であり、第1の被覆層10の40℃、相対湿度90%における水蒸気透過率が1.0g/m2・day・atm以下である熱履歴表示材。【選択図】図1