Abstract: There is disclosed a silver halide photosensitive material having at least one silver halide emulsion layer coated on a support, wherein silver halide grains in the emulsion layer are subjected to reduction sensitization and contain a radical scavenger, prior to the completion of a chemical sensitization. There is also disclosed a silver halide emulsion and a method of manufacturing the same. The said silver halide photosensitive material has a enhanced sensitivity, without causing high fog.

Abstract: A silver halide color photographic material comprises a support having thereon at least one silver halide emulsion layer, a yellow-colored cyan coupler, and a compound capable of releasing a bleaching accelerator or a precursor thereof on reaction with an oxidation product of an aromatic primary amine developing agent.

Abstract: A silver halide color photosensitive material which forms a cyan dye that has superior heat resistance and that will not readily fade in a reducing atmosphere. The silver halide color photosensitive material contains in at least one layer on a support at least one coupler represented by formula (I): ##STR1## wherein R.sup.1 represents hydrogen atom or a substituent; R.sup.2 represents a substituent; X represents hydrogen atom or a group releasable on a coupling reaction with an oxidation product of a color developing agent; Z.sup.1 represents a nonmetallic atom group necessary for forming a nitrogen-containing, six-membered, heterocyclic ring which has at least one dissociative group: Z.sup.1 cannot be --C(.dbd.O)--N(R)--C(.dbd.O)--NH--; and R represents a substituent.Also disclosed is a novel dye forming coupler which exhibits a high coupling activity and which gives a dye having a large molar extinction coefficient and superior stability, the coupler being represented by the following formula (XX) or (XXI).

Abstract: A silver halide color photosensitive material which forms a cyan dye that has superior heat resistance and that will not readily fade in a reducing atmosphere. The silver halide color photosensitive material contains in at least one layer on a support at least one coupler represented by formula (I): ##STR1##wherein R.sup.1 represents hydrogen atom or a substituent; R.sup.2 represents a substituent; X represents hydrogen atom or a group releasable on a coupling reaction with an oxidation product of a color developing agent; Z.sup.1 represents a nonmetallic atom group necessary for forming a nitrogen-containing, six-membered, heterocyclic ring which has at least one dissociative group: Z.sup.1 cannot be --C(.dbd.O)--N(R)-- C(.dbd.O)--NH--; and R represents a substituent.Also disclosed is a novel dye forming coupler which exhibits a high coupling activity and which gives a dye having a large molar extinction coefficient and superior stability, the coupler being represented by the following formula (XX) or (XXI).

Abstract: There is disclosed a silver halide color photographic material which comprises in a blue-sensitive silver halide emulsion layer acylacetamide yellow dye-forming couplers represented by the following formula (I) and in a red-sensitive silver halide emulsion layer cyan dye-forming couplers represented by the following formula (II) or (III): ##STR1## wherein R.sub.1 represents a monovalent group, Q represents a group of non-metallic atoms required to form together with the C a substituted or unsubstituted 3- to 5-membered cyclic hydrocarbon group or a substituted or unsubstituted 3- to 5-membered heterocyclic group having therein at least one heteroatom selected from a group consisting of N, O, S, and P, and Y.sub.R represents a residue remaining after removing the acyl group from the acylacetamide yellow dye-forming coupler, provided that R.sub.1 is not a hydrogen atom and does not bond to Q to form a ring, ##STR2## wherein R.sup.1 represents --CONR.sup.4 R.sup.5, --SO.sub.2 NR.sup.4 R.sup.5, --NHCOR.sup.

Abstract: A silver halide color photographic material is disclosed, which comprises a support thereon having at least one red-sensitive silver halide emulsion layer, in which the red-sensitive silver halide emulsion layer contains at least one cyan coupler of the general formula (I): ##STR1## wherein R represents a substituent;EWG represents an electron-attracting substituent which does not substantially split off from the formula on reaction of the coupler with an oxidation product of an aromatic primary amine developing agent; EWG' represents an electron-attracting substituent having a Hammett's substituent constant .sigma..sub.p of 0.3 or more, other than a perfluoroalkyl group; andW represents a hydrogen atom or a releasable group which splits off on reaction of the coupler with an oxidation product of an aromatic primary amine developing agent.

Abstract: A silver halide color photographic material comprising a support having thereon at least one light-sensitive silver halide emulsion layer containing at least one 1H-pyrrolo[2,1-c][1,2,4]triazole cyan coupler represented by the following general formula (I) or (II): ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 each represents a hydrogen atom or a substituent, provided that at least one of R.sub.1 and R.sub.2 is an electron withdrawing group which has a Hammett's substituent constant .sigma.p value of 0.15 or more; R.sub.1 and R.sub.2 may be bonded to form a ring; and X represents a hydrogen atom or a substituent capable of being released upon coupling with an oxidation product of an aromatic primary amine color developing agent; said coupler may form a bis-compound or or a polymer at R.sub.1, R.sub.2, R.sub.

Abstract: There is disclosed a cyan dye-forming coupler represented by formula (I) and a silver color photographic material containing same. ##STR1## wherein EWG represents an electron-attractive group having a Hammett substituent constant .sigma..sub.p value of 0.30 or more, R represents a substituent, l represents an integer of 0 to 2, X represents a hydrogen atom or a group capable of being released upon coupling reaction with the oxidized product of an aromatic primary amine derivative, R and EWG may bond together to form a ring, and when l is 2, two Rs may be the same or different or may bond together to form a ring.

Abstract: A silver halide color photographic material having on a support at least one cyan dye-forming coupler-containing silver halide emulsion layer, at least one magenta dye-forming coupler-containing silver halide emulsion layer and at least one yellow dye-forming coupler-containing silver halide emulsion layer, wherein the cyan dye-forming coupler is a 1-naphthol type coupler having a naphtol nucleus, in which a group represented by the following formula (I) binds directly to the 2-position of the naphthol nucleus, and the magenta dye-forming coupler is a 1H-pyrazolo[1,5-b]-1,2,4-triazole type coupler, ##STR1## wherein R.sup.1 represents a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group, an aralkyl group, or an aryl group; R.sup.2 represents a substituent group; R.sup.3 and R.sup.4 each represents a hydrogen atom, an alkyl group, an aryl group, a halogen atom, an alkoxy group, or an aryloxy group; l represents an integer from 0 to 4; and m represents an integer from 0 to 4.

Abstract: A silver halide color photographic material comprising a support having thereon at least one light-sensitive silver halide emulsion layer containing at least one 1H-pyrrolo[1,2-b][1,2,4]triazole cyan coupler represented by the following general formula (I) or (II): ##STR1## wherein R.sub.1 and R.sub.2 each represents an electron withdrawing group having a Hammett's substituent constant .sigma.p value of 0.20 or more; R.sub.1 and R.sub.2 may be bonded to form a ring; the sum of a Hammett's substituent constant .sigma.p value of R.sub.1 and R.sub.2 is 0.65 or more; R.sub.3 represents a hydrogen atom or a substituent; and X represents a hydrogen atom or a substituent capable of being released upon coupling with an oxidation product of an aromatic primary amine color developing agent; said coupler may be in a form of a bis-compound or a polymer formed at R.sub.1, R.sub.2, R.sub.

Abstract: There is disclosed a cyan dye-forming coupler represented by formula (I) and a silver halide color photographic material containing same. ##STR1## wherein EWG represents an electron-attractive group having a Hammett substituent constant .sigma..sub.p value of 0.30 or more, R.sub.1 and R.sub.2 each represent a substituent, l represents an integer of 0 or 1, X represents a hydrogen atom or a group capable of being released upon coupling reaction with the oxidized product of an aromatic primary amine derivative, and Y represents a hydroxyl group or a sulfonamido group.

Abstract: A method of forming a cyan dye image in an exposed silver halide color photographic material comprising a support and a photosensitive silver halide emulsion, said method comprising developing the exposed silver halide color photographic material with a color developing solution containing an aromatic primary amine color developing agent in the presence of a cyan coupler represented by formula (I): ##STR1## wherein EWG.sub.1 and EWG.sub.2 each represents an electron attractive group having a Hammett's substituent constant .sigma..sub.p value of at least 0.30 or;R.sub.1 represents a hydrogen atom or a substituent;R.sub.2 represents a substituent;X represents a hydrogen atom or a group capable of splitting off by a coupling reaction with an oxidation product of an aromatic primary amine color developing agent;R.sub.1 and R.sub.2 may be bonded to each other to form a ring; provided that R.sub.2 must not be a halogen atom; and a silver halide color photographic material containing the cyan dye forming coupler.

Abstract: Disclosed is a dye forming coupler represented by formula (I): ##STR1## wherein R.sup.1 and R.sup.2, which may be the same or different, each represents a substituent group, and X is a hydrogen atom or a group which can be eliminated by a coupling reaction with the oxidized species of a primary aromatic amine derivative.

Abstract: Disclosed is a silver halide color photographic material comprising a support thereon having at least one silver halide emulsion layer containing at least one cyan coupler of the general formula (I): ##STR1## where R represents a group capable of being an imidazo[1,2-b]pyrazole skeletal substituent;EWG represents an electron-attracting substituent which does not substantially split off from the formula on reaction of the coupler with an oxidation product of an aromatic primary amine developing agent;X represents a hydrogen atom or a releasable group which splits off from the formula on reaction of the coupler with an oxidation product of an aromatic primary amine developing agent; andn represents an integer of from 1 to 7,providing an excellent cyan dye and cyan image having satisfactory absorption characteristic and color fastness.

Abstract: A silver halide color photographic material having at least one silver halide emulsion layer on a support, said photographic material containing at least one coupler represented by the following general formula (I) in a constituent layer, ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different, each represents an alkyl, alkoxy, alkylthio, alkylsulfonyl, alkoxycarbonyl, alkoxysulfonyl, aryl, aryloxy, arylthio, arylsulfonyl and aryloxycarbonyl group; R.sub.3 and R.sub.4, which may be the same or different, each represents a group by which benzene can be substituted; Z represents nonmetal atoms necessary to form a 5- to 7-membered single or condensed hetero ring together with the nitrogen atom; and m and n each represents an integer of from 0 to 4, and when they are each a plural number, a plural R.sub.3 or a plural R.sub.4 may be the same or different.

Abstract: A silver halide photographic material containing at least one dye forming coupler represented by formula (I): ##STR1## wherein R.sub.0 represents a hydrogten atom or a substituent; R.sub.1 and R.sub.3 each represents a substituent; R.sub.2 represents an electron attracting group; X represents a hydrogen atom or a group releasable on coupling with an oxidation product of an aromatic primary amine derivative, and a silver halide photographic material containing the same are disclosed. The coupler of formula (I) exhibits excellent coupling activity and provides a dye which has a sharp absorption spectrum with no side absorption in the blue and green light regions and exhibits stability to light, heat and moisture and improved color reproducibility.

Abstract: A silver halide color photographic material comprising a support having thereon at least one sensitive silver halide emulsion layer, wherein the emulsion layer contains a coupler represented by the following general formula (I) ##STR1## wherein X represents a non-metallic atomic group required for forming a heterocyclic ring together with a residue of the formula ##STR2## Y represents a group which is eliminated by coupling and has substantially no photographic effect and Z represents an electron attractive group (a substituent group having a value of at least 0.2 in terms of Hammett's .sigma.m substituent constant).

Abstract: A silver halide color photographic material is described which contains at least one of yellow couplers represented by the following general formula (I) and at least one of compounds represented by the following general formula (A-I): ##STR1## wherein R.sup.1 represents a substituted or unsubstituted N-phenylcarbamoyl group; R.sup.2 represents an alkyl group or an aryl group; X.sup.1 represents a group represented by the following formula (a), (b), (c) or (d): ##STR2## wherein R.sup.3 and R.sup.4, which may be the same or different, each is a hydrogen atom, a halogen atom, a carboxylic acid ester group, an amino group, an alkyl group, an alkylthio group, an alkoxy group, an alkylsulfonyl group, an alkylsulfinyl group, a carboxyl group, a sulfonic acid group or a salt thereof, a substituted or unsubstituted phenyl group or a heterocyclic ring, ##STR3## wherein W.sup.

Abstract: A silver halide color photographic material is described comprising a support having thereon at least one silver halide emulsion layer, wherein the silver halide color photographic material contains a water-soluble polymer comprising at least one repeating unit represented by formula (I) ##STR1## wherein A represents a vinyl repeating unit having a color coupler moiety which is capable of forming a dye upon coupling with an oxidation product of an aromatic primary amine developing agent;and at least one repeating unit selected from the group consisting of formulae (II-A), (II-B), (II-C), (II-D), (II-E), and (II-F): ##STR2## The water-soluble polymer is a photographic polymeric coupler incorporating a crosslinkable group with gelatin and the silver halide color photographic material containing the water-soluble coupler is excellent in layer strength and image sharpness.

Abstract: A filter element comprises at least two pleated filtering mediums and at least one roughly flat filtering medium interposed between the pleated filtering mediums. Each pleated filtering medium has an end constituted by edges of triangular bottom sections and the other end constituted by edges of triangular top sections. The triangular bottom sections of one pleated filtering medium is bonded to the flat filtering medium only at and near the edges of the bottom sections. The triangular top sections of the other pleated filtering medium is bonded to the roughly flat filtering medium only at and near the edges of the top sections. Spacers are provided between the top sections and the flat filtering medium and between the bottom sections and the roughly flat filtering medium. Such spacers may be constituted by alternate small ridges and grooves formed in the roughly flat filtering medium.