Leuco dyes and recording materials using the same
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United States of America Patent
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Jun 18, 1991
Issued Date -
N/A
app pub date -
Mar 2, 1990
filing date -
May 30, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A leuco dye having the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each represent a lower alkyl group; R.sup.5 represents an .alpha.-naphthyl group, .beta.-naphthyl group or ##STR2## wherein R.sup.6 represents --NHCOR.sup.9, a halogen or an amino group which is unsubstituted or substituted by one or two C.sub.1 -C.sub.4 alkyl groups which are the same or different; and R.sup.7, R.sup.8 and R.sup.9 each represent hydrogen or a lower alkyl group, provided that when both R.sup.7 and R.sup.8 are hydrogen, R.sup.6 represents --NHCOR.sup.9 or bromine. These dyes absorb in the near-infrared region and yield colored images with a color developer therefor with excellent preservability.
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