Color developers and thermographic record compositions containing them
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United States of America Patent
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Nov 13, 1984
Grant Date -
N/A
app pub date -
Jun 15, 1982
filing date -
Jun 24, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to thermographic record compositions and to novel color developers for thermographic compositions consisting of: the compounds of formula: ##STR1## in which R represents: H, alkyl, NO.sub.2, halogen, aryl, NH.sub.2, OH, COOH, HSO.sub.3, NR.sub.1 R.sub.2, COOR.sub.3, OR.sub.4 (R.sub.1, R.sub.2, R.sub.3, R.sub.4 =alkyl or aryl), X represents H or a group possessing a labile H capable of forming a stable anion by loss of a proton H.sup.+, or their salts of formula, when X=H: ##STR2## in which R and n are as defined hereinabove and M.sup.+ represents a metal cation. The invention is more particularly applicable to supports for recording data.
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