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US 5,665,887 AGranted
Methine compound
AssigneeFuji Photo Film Co., Ltd.
InventorToyohisa Oya
Life of this patent
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Abstract
A novel methine compound is disclosed, which contains a rhodanine ring substituted with a linear or branched alkyl, alkenyl, or alkynyl group containing at least one carboxyl group and at least one ester bond, amide bond, or ether bond. The methine compound has excellent stability and dyeing power.
Claims3
A methine compound represented by general formula (I):
- ##STR21## wherein Z.sub.1 represents a group of nonmetal atoms necessary for completing a five- or six-membered nitrogen-containing heterocycle;
- R.sub.1 represents an unsubstituted or substituted alkyl group;
- R.sub.2 represents a linear or branched alkyl, alkenyl, or alkynyl group containing at least one carboxyl group and at least one ester bond, amide bond, or ether bond;
- X.sub.1 represents a counter ion necessary for charge neutralization;
- and n.sub.1 represents a number of 0 or larger necessary for intramolecular charge neutralization.
2 more elements
Dependencies are inferred from the claim text.