Heat sensitive recording material
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United States of America Patent
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May 19, 1998
Grant Date -
N/A
app pub date -
Jul 25, 1996
filing date -
Jul 31, 1995
priority date (Note) -
Expired
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Abstract
The present invention provides a heat sensitive recording material comprising a substrate and a recording layer thereon incorporating a colorless or light-colored basic dye and a color acceptor, the recording material being characterized in that, the basic dye comprises an indolyldiazaphthalide derivative of the formula (1), and the color acceptor comprises a diphenyl sulfone derivative of the formula (2) and/or a benzanilide derivative of the formula (3) ##STR1## wherein R.sub.1 to R.sub.8 are defined in the specification.
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