Irreversible heat-sensitive composition
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United States of America Patent
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-
Aug 5, 2003
Grant Date -
Nov 22, 2001
app pub date -
Apr 23, 2001
filing date -
Apr 25, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An irreversible heat-sensitive composition comprises a mixture of a granular or powdery heat-fusible substance having a melting point corresponding to a temperature to be recorded and a granular or powdery dyestuff diffusible into the fused heat-fusible substance through dispersion or dissolution. A heat-sensitive ink comprises the irreversible heat-sensitive composition and an ink vehicle capable of diffusing the fused heat-fusible substance therein. A heat-sensitive ink according to another embodiment comprises microcapsules, which encapsulate the irreversible heat-sensitive composition. A heat-sensitive indicator comprises a substrate provided thereon with a printed heat-sensitive ink, the heat-sensitive ink being one of these heat-sensitive inks.
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