Recording material containing leuco dye
AssigneeFuji Photo Film Co., Ltd.
InventorsToru Harada, Toshiyuki Watanabe
Life of this patent
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Abstract
A recording material comprises a layer containing a leuco dye provided on a support, characterized in that the leuco dye has the formula (I): ##STR1## in which one of X and Y is a single bond and the other is sulfur atom; each of R.sub.1 and R.sup.2 independently is an alkyl group, a cycloalkyl group or an aralkyl group; each of R.sup.3 and R.sup.4 independently is hydrogen, a halogen atom, an alkyl group, an alkoxy group, a cycloalkyl group, an aralkyl group or an aryloxy group; R.sup.5 is hydrogen, a halogen atom, an alkyl group, an alkoxy group, nitro or amino; and each of R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 may have one or more substituent groups.
Claims9
A recording material comprising a layer containing a leuco dye provided on a support, wherein the leuco dye has the formula (I):
- ##STR13## in which one of X and Y is a single bond and the other is sulfur atom;
- each of R.sup.1 and R.sup.2 independently is a monovalent group selected from the group consisting of an alkyl group, a cycloalkyl group and an aralkyl group;
- each of R.sup.3 and R.sup.4 independently is a monovalent group selected from the group consisting of hydrogen, a halogen atom, an alkyl group, an alkoxy group, a cycloalkyl group, an aralkyl group and an aryloxy group;
- R.sup.5 is a monovalent group selected from the group consisting of hydrogen, a halogen atom, an alkyl group, an alkoxy group, nitro and amino;
- and each of R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 may have one or more substituent groups.
Dependencies are inferred from the claim text.