The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 24, 1993
Filed:
Sep. 17, 1992
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
Disclosed is a silver halide photographic material having a hydrophilic colloid layer which contains a dispersion of fine solid grains of at least one dye of formula (I): ##STR1## where R.sub.1 and R.sub.2 each represents an alkyl group, an aryl group, a cyano group or a group of COOR.sub.3, COR.sub.3, CONR.sub.4 R.sub.5, NR.sub.4 R.sub.5, NR.sub.4 COR.sub.3, NR.sub.4 CONR.sub.4 R.sub.5, OR.sub.3, SR.sub.3, SOR.sub.3 or SO.sub.2 R.sub.3 ; R.sub.3 being an alkyl group or an aryl group, and R.sub.4 and R.sub.5 each being a hydrogen atom, an alkyl group or an aryl group, and R.sub.3 and R.sub.4 or R.sub.4 and R.sub.5 being optionally bonded to each other to form a 5-membered or 6-membered ring; L.sub.1, L.sub.2 and L.sub.3 each represents a methine group; and n represents 0 or 1; provided that R.sub.1, R.sub.2, L.sub.1, L.sub.2 and L.sub.3 must not have an ionizable proton-having group or a salt thereof. The material preferably has, in addition to the dispersion of fine solid grains of at least one dye of formula (I), a dispersion of fine solid grains of at least one dye of formula (II): ##STR2## where R.sub.21 and R.sub.23 each represents a hydrogen atom, an alkyl group or an aryl group; R.sub.22 and R.sub.24 each represents an alkyl group, an aryl group, or a group of OR.sub.26, COOR.sub.26, COR.sub.25, SR.sub.26, SOR.sub.25, SO.sub.2 R.sub.25, CONR.sub.26 R.sub.27, NR.sub.26 COR.sub.25, NR.sub.26 CONR.sub.26 R.sub.27 or NR.sub.25 R.sub.26, or a cyano group; R.sub.25 being an alkyl group or an aryl group, and R.sub.26 and R.sub.27 each being a hydrogen atom, an alkyl group or an aryl group, and R.sub.25 and R.sub.26 or R.sub.26 and R.sub.27 being optionally bonded to each other to form a 5-membered or 6-membered ring; and L.sub.21, L.sub.22 and L.sub.23 each represents a methine group; provided that the formula has at least one aryl group having at least one substituent selected from the group consisting of a carboxylic acid group, a sulfonamide group and an arylsulfamoyl group except for the case where R.sub. 21 and R.sub.23 are both hydrogen atoms. The dyes (I) and (II) color only a hydrophilic colloid layer containing them, and they do not diffuse to any other layers during storage of the material. After developed, the dyes (I) and (II) are rapidly decolored.