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United States of America Patent
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May 18, 1982
Issued Date -
N/A
app pub date -
Nov 26, 1980
filing date -
Jul 23, 1970
priority date (Note) -
Expired
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Abstract
The present invention discloses novel fluoran compound useful as the lactone electron donative color-forming agents having the general formula: ##STR1## wherein, R.sub.1, R.sub.2 and R.sub.4 are respectively hydrogen, methyl or ethyl groups; R.sub.3 is hydrogen or a methyl group; and R.sub.5 is a phenyl group or a phenyl group substituted with from one to five methyl groups. The compound of the invention is soluble in aromatic solvents as well as in aromatic-aliphatic mixed solvents and also has excellent light fastness after developing color.
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