Leuco dye and image recording medium containing the same
AssigneeFuji Photo Film Co., Ltd.
InventorsTatsuhiko Obayashi, Atsuhiro Ohkawa
Life of this patent
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Abstract
Disclosed is a leuco dye in which a hydrogen atom capable of transferring by isomerization in a dye represented by formula (1) or a tautomer thereof is substituted by a substituent group P which can be removed by the action of heat or acid ##STR1## wherein (A) represents an atomic group necessary for forming a nitrogen-containing hetero ring; (B) represents an atomic group necessary for forming a six-membered hetero ring; and X represents an oxygen atom, a sulfur atom or a nitrogen atom, which may have a hydrogen atom or a possible substituent group.
Claims8
A leuco dye in which a hydrogen atom capable of transferring by isomerization in a dye represented by formula (1) or a tautomer thereof is substituted by a substituent group P which can be removed by the action of heat or acid ##STR20## wherein (A) represents an atomic group necessary for forming a nitrogen-containing hetero ring;
- (B) represents an atomic group necessary for forming a six-membered hetero ring;
- and X represents an oxygen atom, a sulfur atom or a nitrogen atom, which may have a hydrogen atom or a possible substituent group.
Dependencies are inferred from the claim text.