Sensitizer for heat sensitive paper coatings
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United States of America Patent
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Nov 19, 1991
Grant Date -
N/A
app pub date -
Feb 9, 1990
filing date -
Feb 9, 1990
priority date (Note) -
Expired
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Abstract
A heat sensitive coating has a colorless or light colored leuco dye precursor, preferably having a five-membered spirol lactone ring at one end of the molecule, and a tertiary amino group at another end of the molecule, and a developer. Sensitizers which increase the heat sensitivity of these dye precursors, and compositions of sensitized dye/developer systems are disclosed. The sensitizers are .gamma.-substituted lactones, 3-naphthylmethylidenephthalide, and derivatives of benzalphthalide.
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