Lithographic Emulsion Patents (Class 430/949)
  • Patent number: 4722884
    Abstract: A negative silver halide photographic light-sensitive material is provided, having a silver halide emulsion layer, which layer comprises silver haloiodide grains prepared in the presence of an iridium salt in an amount of 1.times.10.sup.-8 to 1.times.10.sup.-5 mole per one mole of silver, wherein the silver iodide content in the surface part of said grain is larger than the average silver iodide content in said grain, and additionally containing in said emulsion layer or in some other hydrophilic colloid layer, a compound of formula (I):R.sub.1 --NHNH--CHO (I)wherein R.sub.1 represents an aliphatic group or an aromatic group. Said photographic light-sensitive material is, after being exposed imagewise, developed with a developer containing 0.15 mole/l or more sulfite ion and having a pH value of 9.5-12.3, to form negative images having ultra-high contrast.
    Type: Grant
    Filed: July 23, 1985
    Date of Patent: February 2, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobuaki Inoue, Senzo Sasaoka, Kenichi Kuwabara, Kimitaka Kameoka
  • Patent number: 4699873
    Abstract: A negative silver halide photographic light-sensitive material comprising a support having provided thereon at least one silver halide emulsion layer is disclosed. At least one of the silver halide emulsion layers or another hydrophilic colloidal layer of the material contains a hydrazine derivative and a compound represented by the formula:R.sub.1 --S--S--R.sub.2wherein R.sub.1 and R.sub.2, which may be the same or different, each represents an aliphatic group, an aromatic group or a heterocyclic group, or when R.sub.1 and R.sub.2 are both aliphatic groups they may together form a ring. The material can rapidly form a superhigh contrast image using a stable processing solution.
    Type: Grant
    Filed: January 29, 1986
    Date of Patent: October 13, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Toshiro Takahashi, Shigeo Hirano
  • Patent number: 4693956
    Abstract: A process is disclosed for forming a high-contrast photographic image by developing a silver halide photographic element, including at least a silver halide emulsion layer, with an aqueous alkaline developing solution containing a dihydroxybenzene developing agent, a superadditive developing agent and an antioxidant at a pH of less than 12 in the presence of a hydrazine compound, an organic antifogging and contrast promoting agent selected within the class including a benzotriazole compound and a benzimidazole compound and a non polymeric hydroxymethylidyne group containing compound of formula: ##STR1## wherein R.sub.1 and R.sub.2 each independently represent a hydrogen atom, an aliphatic group, an aromatic group, a heterocyclic group, or R.sub.1 and R.sub.2 together complete a non aromatic cyclic group.
    Type: Grant
    Filed: November 15, 1985
    Date of Patent: September 15, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Carlo Marchesano
  • Patent number: 4686167
    Abstract: Disclosed are novel compounds of the formula: ##STR1## wherein: X=--NR.sub.5 R.sub.6, or --OR.sub.7 ;R.sub.1 and R.sub.2 are independently hydrogen, substituted or unsubstituted alkyl, haloalkyl, hydroxyalkyl alkoxyalkyl, alkylaminoalkyl or arylalkyl having up to 18 carbons; cycloalkyl; phenyl or naphthyl; alkylphenyl, cyanophenyl, halophenyl or alkoxyphenyl substituents.R.sub.3 is hydrogen, benzyl, alkoxybenzyl, halobenzyl or alkylbenzyl, provided that if neither R.sub.1 nor R.sub.2 is hydrogen, then R.sub.3 is hydrogen.R.sub.4 is a divalent aromatic group which is substituted or unsubstituted.R.sub.5, R.sub.6, and R.sub.7 are independently hydrogen, alkyl, hydroxyalkyl, haloalkyl, alkoxyalkyl, alkylaminoalkyl, acylaminoalkyl, aminoalkyl or phenylalkyl having up to 12 carbons; a cycloalkyl substituent; phenyl or naphthyl; an alkylphenyl, cyanophenyl, halophenyl or alkoxyphenyl substituent.Furthermore, either R.sub.1 and R.sub.3 or R.sub.1 and R.sub.
    Type: Grant
    Filed: September 26, 1985
    Date of Patent: August 11, 1987
    Assignee: Anitec Image Corporation
    Inventors: Bruce M. Resnick, Allan J. Wexler
  • Patent number: 4681836
    Abstract: A silver halide photographic material having at least one silver halide emulsion layer which contains silver halide grains containing from 1.times.10.sup.-8 to 8.times.10.sup.-6 mole of a rhodium salt per mole of silver, and containing in said emulsion layer or another hydrophilic colloidal layer a compound represented by formula (I)R.sup.1 -NHNH-G-R.sup.2 (I)wherein R.sup.1 represents an aliphatic group or an aromatic group; R.sup.2 represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkoxy group, or a substituted or unsubstituted aryloxy group; and G represents a carbonyl group, a sulfonyl group, a sulfoxy group, a phosphoryl group, or an N-substituted or unsubstituted imino group; is exposed to imagewise pattern of light and then development-processed with a developer containing 0.15 mole/liter or more of sulfite ion and having a pH adjusted to from 9.5 to 12.
    Type: Grant
    Filed: November 20, 1986
    Date of Patent: July 21, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobuaki Inoue, Yoshio Inagaki, Kimitaka Kameoka
  • Patent number: 4659647
    Abstract: A photosensitive silver halide material for obtaining black and white half-tone dot or line images comprises a fine grain and high-chloride silver halide emulsion reactively associated with an aqueous latex of a hydrophobic vinyl addition polymer in combination with a stabilizer selected from the group consisting of 4-hydroxy-1,3,3a,7-tetrazaindenes, benzotriazoles and benzimidazoles. The silver halide emulsion has an average grain size lower than or equal to 0.20 micron with at least 60% of its molar halide content consisting of chloride ions.The material allows high-contrast and high resolving power images to be obtained.The material has a good developability in photographic processings and this reduces the development times and increases productivity.
    Type: Grant
    Filed: December 10, 1985
    Date of Patent: April 21, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Alberto Vacca, Angelo Vallarino
  • Patent number: 4636456
    Abstract: A process for forming photographic image is disclosed, comprising photographically developing, in the presence of a polyalkylene oxide compound, a silver halide photographic light-sensitive material including at least one silver halide emulsion layer and containing in at least said emulsion layer or other hydrophilic layer a compound represented by formula (I). ##STR1## wherein: A and A' each represents a hydrogen atom or an alkalihydrolyzable group;R.sub.1, R.sub.2, and R.sub.3 each represents a group capable of substituting a hydrogen atom on the hydroquinone nucleus, with R.sub.2 and R.sub.3, A and R.sub.1, or A and R.sub.2 together form a ring; andX represents a group which shows a development-inhibiting effect after being released.
    Type: Grant
    Filed: May 7, 1985
    Date of Patent: January 13, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Toshiro Takahashi, Koki Nakamura
  • Patent number: 4624913
    Abstract: A silver halide photographic light-sensitive material is described, comprising at least one light-sensitive silver halide emulsion layer on a support, wherein the emulsion in said light-sensitive silver halide emulsion layer comprises a silver iodobromide emulsion containing 3 mol % or more of iodide, and at least one of said light-sensitive emulsion layer or another hydrophilic colloid layer contains a polyoxyethylene type surface active agent and at least one of said light-sensitive emulsion layer or another hydrophilic colloid layer contains a meso-ionic triazolium compound represented by formula (I) ##STR1## wherein X represents a sulfur ion or --N--R.sup.4, and R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each represents a hydrogen atom or a substituted or nonsubstituted alkyl group, aryl group, or heterocyclic group, or R.sup.1 and R.sup.2, R.sup.2 and R.sup.3 or R.sup.3 and R.sup.4 can together form a heterocyclic ring.
    Type: Grant
    Filed: February 11, 1985
    Date of Patent: November 25, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobuaki Miyasaka, Koki Nakamura, Shigeki Yokoyama
  • Patent number: 4619886
    Abstract: A process for forming a high contrast negative image by developing an exposed substantial surface latent image type silver halide photographic light-sensitive material in the presence of hydrazines, which comprises using a developing solution having a pH value of 10.5 to 12.3 and containing at least(1) a developing agent,(2) 0.25 mol/l or more of sulfite, and(3) a compound represented by the following general formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5, which may be the same or different, each represents a hydrogen atom, a hydroxyl group, an alkyl group, an alkoxy group or a substituted alkyl group. According to the process, the development processing time required is shortened in the case of forming a high contrast negative image with a stable developing solution using hydrazines.
    Type: Grant
    Filed: March 21, 1985
    Date of Patent: October 28, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Eiichi Okutsu
  • Patent number: 4569904
    Abstract: A method for developing an exposed negative silver halide photographic light-sensitive material is described, in the presence of a hydrazind derivative, comprising treating the material with a developer containing at least components (a) a developing agent, (b) not less than 0.25 mol/liter of a sulfite, and (c) not less than 0.1 mol/liter of a compound having an acid dissociation constant of from 1.times.10.sup.-11 to 3.times.10.sup.-13, and having a pH value of from 10.5 to 12.3.
    Type: Grant
    Filed: October 23, 1984
    Date of Patent: February 11, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiich Okutsu, Kazumi Watase, Yoshio Inagaki, Shigeo Hirano
  • Patent number: 4560638
    Abstract: An unballasted arylhydrazide is disclosed the aryl moiety of which is substituted with a group of the formula ##STR1## where one of X and X' represents --NH--, the other represents a divalent chalcogen, and R represents an aliphatic or aromatic residue. The arylhydrazides, when applied to halftone imaging in conjunction with silver halide emulsions, photographic elements, and imaging processes, produce images of improved dot quality and low levels of pepper fog.
    Type: Grant
    Filed: October 9, 1984
    Date of Patent: December 24, 1985
    Assignee: Eastman Kodak Company
    Inventors: James C. Loblaw, Barbara B. Lussier
  • Patent number: 4551412
    Abstract: A silver halide photographic light-sensitive material for photo-mechanical process comprising a support having thereon at least one light-sensitive silver halide emulsion layer and at least one light-insensitive upper layer which is positioned above the light-sensitive silver halide emulsion layer, wherein at least one of the light-insensitive upper layers has a melting time longer than a melting time of the light-sensitive silver halide emulsion layer and the light-insensitive upper layer contains a polymer latex.The silver halide photographic light-sensitive material has excellent aptitude for reduction treatment without increasing the amount of silver per unit area. The occurrence of reticulation is prevented with the silver halide photographic light-sensitive material.
    Type: Grant
    Filed: August 17, 1983
    Date of Patent: November 5, 1985
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Masashi Ogawa, Taku Nakamura, Yukihide Urata, Shingo Yamauchi
  • Patent number: 4521508
    Abstract: A silver halide photographic light-sensitive material is disclosed. The material is comprised of a support base having thereon a silver halide emulsion layer and a protective layer. The material contains a photosensitive silver halide emulsion and inside fogged silver halide emulsion as well as a disulfide compound. The disulfide compound is a compound represented by the general formula (I):A--S--S--B (I)wherein A and B independently represent an alkyl group, an aralkyl group, an aryl group, a heterocyclic group or ##STR1## wherein R represents an alkyl group, an aryl group, an aralkyl group, a heterocyclic group or an amino group. The material can form images having high contrast and a high maximum density. Further, the material has high sensitivity to light and can be developed at a low temperature in a reduced amount of time.
    Type: Grant
    Filed: November 7, 1983
    Date of Patent: June 4, 1985
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tadao Sugimoto, Hideo Ikeda, Hiroyuki Mifune, Koki Nakamura
  • Patent number: 4510229
    Abstract: A lithographic photosensitive material which comprises a support having thereon at least one silver halide emulsion layer and that, contains as a lithographic development accelerating agent a compound represented by the following general formula (I) in its silver halide emulsion layer or another hydrophilic colloidal layer: ##STR1## wherein R.sub.1 to R.sub.5 may be the same or different, and they each represent hydrogen, a halogen atom, an alkyl group, an alkoxy group, an aryl group, ##STR2## (wherein R.sub.6 and R.sub.7 each represents hydrogen or an alkyl group, or they may combine with each other to form a 5- or 6-membered nitrogen containing saturated hetero ring), --NH--CO--R.sub.8 or --NHSO.sub.2 --R.sub.9 (wherein R.sub.8 and R.sub.9 each represents an alkyl group, an aryl group or an aralkyl group), or R.sub.3 and R.sub.4, or R.sub.4 and R.sub.5 may combine with each other to form a benzene ring and that, it is necessary to said compound that at least one of substituents R.sub.1, R.sub.3 and R.sub.
    Type: Grant
    Filed: March 19, 1984
    Date of Patent: April 9, 1985
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yutaka Oka, Naomi Saeki, Yoshiharu Fuseya
  • Patent number: 4452882
    Abstract: A silver halide photographic light-sensitive material and a developing process used in connection with that material are disclosed. The material is comprised of a support having thereon a silver halide emulsion layer containing a silver halide emulsion in which at least 80 mole % of the whole silver halide is composed of silver chloride, the mean grain size thereof is less than 0.4 .mu.m, and which contains more than 1.times.10.sup.-6 mole of a water-soluble rhodium salt per mole of silver at an optional period before finishing the first ripening in the production step for the silver halide emulsion. The material also contains 1.times.10.sup.-5 to 1.times.10.sup.-2 mole of polyalkylene oxide having a molecular weight of at least 600 or a derivative thereof per mole of silver. The process involves imagewise exposing the material and processing it in a developer containing 0.05 to 0.5 mole/liter of a dihydroxybenzene series developing agent, 0 to 0.05 g/liter of an auxiliary developing agent, at least 0.
    Type: Grant
    Filed: April 29, 1983
    Date of Patent: June 5, 1984
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoshitaka Akimura, Eiichi Okutsu, Shigenori Moriuchi, Naomi Saeki, Taiji Hashimura, Hiroyuki Mifune
  • Patent number: 4447522
    Abstract: A method of forming a photographic image which comprises development processing with an alkaline activator solution a silver halide photographic light-sensitive material comprising a support having thereon at least one surface latent image type silver halide emulsion layer, and containing in at least one layer selected from the silver halide emulsion layer and another hydrophilic colloid layer(1) a developing agents;(2) an acylhydrazine compound represented by formula (I):R.sup.1 NHNHCOR.sup.2 (I)wherein R.sup.1 represents an unsubstituted or substituted aryl group or alkyl group; and R.sup.2 represents a hydrogen atom, or an unsubstituted or substituted aryl group or alkyl group; and(3) at least one compound represented by formula (II): ##STR1## wherein each of W.sup.1 and W.sup.2 can represent a hydrogen atom or an aliphatic group or W.sup.1 and W.sup.2 are bonded each other to form a ring; W.sup.3 represents a divalent aliphatic group; Q.sup.
    Type: Grant
    Filed: April 18, 1983
    Date of Patent: May 8, 1984
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigeo Hirano, Yoshihiro Takagi
  • Patent number: 4444875
    Abstract: Herein are disclosed a light-sensitive silver halide photographic material comprising a support and, coated thereon, a hydrophilic colloid layer or layers including a silver halide emulsion layer, at least one of said hydrophilic colloid layer or layers containing a 1H-tetrazolium compound, and an image-forming method which comprises processing a light-sensitive silver halide photographic material mentioned above.The light-sensitive silver halide photographic material and the image-forming method according to the present invention can provide a high contrast silver image and a clear dot quality.
    Type: Grant
    Filed: March 25, 1983
    Date of Patent: April 24, 1984
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Toshiharu Nagashima, Takeshi Habu
  • Patent number: 4429036
    Abstract: A method of forming a photographic image which comprises development processing with an alkaline aqueous activator solution a silver halide photographic light-sensitive material comprising a support having thereon at least one surface latent image type silver halide emulsion layer, and containing in at least one layer selected from a silver halide emulsion layer and another hydrophilic colloid-layer (1) a hydroquinone series developing agent and (2) an acylhydrazine compound represented by formula (I):R.sup.1 NHNHCOR.sup.2 (I)wherein R.sup.1 represents an unsubstituted or substituted aryl group or alkyl group; and R.sup.2 represents a hydrogen atom, or an unsubstituted or substituted aryl group or alkyl group,wherein the aqueous activator solution or a prebath thereof contains at least one compound represented by formula (II): ##STR1## wherein each of W.sup.1, W.sup.2, W.sup.3, and W.sup.
    Type: Grant
    Filed: March 31, 1983
    Date of Patent: January 31, 1984
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigeo Hirano, Yoshihiro Takagi
  • Patent number: 4416980
    Abstract: High-contrast light-sensitive silver halide photographic material which comprises a support, a silver halide emulsion layer containing silver halide and another hydrophilic colloidal layer coated on the support, at least one of said silver halide emulsion layer and another hydrophilic colloidal layer containing a substantially non-diffusible compound having oxidizing power on a hydroquinone developing agent, and the thickness, in an aqueous solution having the composition described as in the specification kept at 23.degree. C., of said at least one layer being from 1.2-4.5 times that of said layer dried in an atmosphere at 23.degree. C. at a relative humidity of 55%.
    Type: Grant
    Filed: September 4, 1980
    Date of Patent: November 22, 1983
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Mitsuto Fujiwhara, Syunji Matsuo, Toyoaki Masukawa, Yutaka Kaneko, Mikio Kawasaki
  • Patent number: 4399243
    Abstract: A composition is provided which cleans, conditions, removes scratches, and finishes lithographic plates, the composition being an emulsion of an aqueous phase in an oil phase, the oil phase including a highly penetrating solvent such as mineral spirits, an oleophilic acid, and an emulsifying surfactant such as a non-ionic benzene sulfonate, while the aqueous phase includes a hydrophilic synthetic desensitizer such as a modified polyacrylamide, a gum desensitizer, a desensitizing agent such as phosphoric acid or derivatives thereof, a nitrate salt, and water. These compositions perform as plate cleaners, conditioners and scratch removers when put to use in the press room, and also are typically suitable for use as finishers for exposed and developed plates within the plate making room.
    Type: Grant
    Filed: December 12, 1980
    Date of Patent: August 16, 1983
    Assignee: Richardson Graphics Company
    Inventors: Sunit S. Dixit, Daniel C. Thomas
  • Patent number: 4358530
    Abstract: A photosensitive lithographic printing plate precursor and a method for the preparation of a lithographic printing plate is described, said precursor comprising a support, a non-silver photosensitive layer and a photographic silver halide emulsion coating, and exhibiting photographic camera speed and a printing durability equivalent to the conventional type presensitized plate due to the underlying non-silver photosensitive layer; the silver halide emulsion coating contains a compound represented by the formual (I)R.sup.1 NHNHCOR.sup.2 (I)in which R.sup.1 represents an aryl group and R.sup.2 represents hydrogen, an aryl group, or an aliphatic group.
    Type: Grant
    Filed: October 2, 1980
    Date of Patent: November 9, 1982
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Keisuke Shiba
  • Patent number: 4346167
    Abstract: A silver halide photographic light-sensitive material is described comprising a support having thereon at least one light-sensitive silver halide emulsion layer, said silver halide emulsion layer containing a rhodium salt in an amount sufficient to increase a contrast thereof, and said silver halide emulsion layer or a layer adjacent thereto containing a compound represented by the following formula (I) or (II), and a process for producing a silver halide photographic emulsion containing rhodium salts is also described which comprises adding a rhodium salt into a silver halide photographic emulsion in an amount sufficient to increase a contrast before the conclusion of first ripening and adding a compound represented by the following formula (I) or (II) into the resulting emulsion after washing to remove useless salts ##STR1## wherein R.sub.1 represents hydrogen or a substituted or unsubstituted alkyl group.
    Type: Grant
    Filed: July 29, 1981
    Date of Patent: August 24, 1982
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiji Imatomi, Tsuyoshi Ogawa, Tsutomu Hamaoka
  • Patent number: 4343873
    Abstract: A photographic light-sensitive silver halide element is described comprising a support, at least one light-sensitive silver halide emulsion layer and a light-scattering layer. This element is used for forming a dot image by a photographic exposure using laser through a contact screen. The light-scattering layer is provided in such a manner that the silver halide emulsion layer is exposed to laser through the light-scattering layer.
    Type: Grant
    Filed: October 15, 1980
    Date of Patent: August 10, 1982
    Assignee: Fuji Photo Film Company, Ltd.
    Inventor: Senzo Sasaoka
  • Patent number: 4335199
    Abstract: High contrast photographic images suitable for lithographic use are obtained with stable (nonlithographic) developers when iodide is released from a surface-sensitized iodobromide emulsion to induce development of the exposed areas in an internally sensitized core-shell emulsion. A bromoiodide or trihalide core is produced by balanced double jet precipitation, then the core is chemically sensitized and covered with a chlorobromide or chloride shell by balanced double jet precipitation or preferably by a cyclic pAg addition technique. The core-shell emulsion must have a sensitivity equal to or greater than the surface sensitized emulsion.
    Type: Grant
    Filed: February 19, 1980
    Date of Patent: June 15, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: daniel J. Mickewich, John R. Shock, Daniel F. Juers
  • Patent number: 4329417
    Abstract: A novel method of forming high contrast silver images is provided. The method comprises steps of (1) imagewisely exposing a light-sensitive silver halide photographic material, and (2) treating the exposed material with a developer having superadditivity. The method is characterized by the co-existence of an oxidizing agent, and a water-insoluble ion pair formed by a water-soluble cationic compound such as quaternary ammonium or tertiary sulfonium salt and a water-soluble anionic compound such as organic sulfate. The method realizes high contrast photographic images by using a developer having a good preservability, without contamination of the developer, within a short period of time for the development. There is also provided a light-sensitive silver halide photographic material herein.
    Type: Grant
    Filed: June 10, 1980
    Date of Patent: May 11, 1982
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Toshio Nagatani, Takeshi Habu, Kazuo Takahashi
  • Patent number: 4328302
    Abstract: A lithographic silver halide photographic light-sensitive material is described which scarcely exhibits colored fringe and black pepper, forms halftone dots of good quality whether a fresh or an exhausted developer is used for processing thereof, and which scarcely shows a drop in sensitivity even when a developer contaminated by a fixing solution is used; said material comprises a support and at least one lithographic silver halide emulsion layer, and containing in said emulsion layer or in another hydrophilic colliodal layer which does not contain silver halide emulsion at least one compound represented by formula (I) ##STR1## wherein M represents hydrogen, an alkali metal ion or --NH.sub.4.sup..sym. ; X represents --SO.sub.2 NHR', --COOM', --SO.sub.3 M', --OH or --CONH.sub.2, wherein M' represents hydrogen, an alkali metal ion or --NH.sub.4.sup..sym.
    Type: Grant
    Filed: February 9, 1981
    Date of Patent: May 4, 1982
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tatsuo Nishimura, Hiroyuki Mifune, Yoshiharu Fuseya, Yukihide Urata, Tadao Shishido, Yasuo Kasama
  • Patent number: 4323643
    Abstract: A silver halide photographic light-sensitive material is described, comprising at least one silver halide photographic emulsion layer, wherein at least one layer contains a compound represented by formula (I) ##STR1## wherein R.sup.1 and R.sup.2 each represents hydrogen, an aliphatic group, an aromatic group, or a heterocyclic group;R.sup.3 represents hydrogen or an aliphatic group, andX represents a divalent aromatic group.The light-sensitive material provides high-contrast negative images and good dot image quality.
    Type: Grant
    Filed: November 6, 1980
    Date of Patent: April 6, 1982
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroyuki Mifune, Shigeo Hirano, Yoshitaka Akimura
  • Patent number: 4318979
    Abstract: A light-sensitive silver halide photographic material comprising a combination of a salt of tetrazolium containing only a non-metallic anion and a salt of tetrazolium containing a metallic anion.
    Type: Grant
    Filed: December 10, 1980
    Date of Patent: March 9, 1982
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Takeshi Habu, Chika Honda
  • Patent number: 4311781
    Abstract: A silver halide photographic material providing very high contrast and negative image photographic characteristics comprising a support having thereon at least one silver halide photographic emulsion layer containing substantially surface latent image type mono-dispersed silver halide grains and providing a negative image, at least one hydrophilic colloid layer of the photographic material containing a compound represented by the general formula (I)R.sup.1 NHNHCOR.sup.2 (I)whereinR.sup.1 represents an aryl group and R.sup.2 represents a hydrogen atom, a phenyl group, or an unsubstituted alkyl group having 1 to 3 carbon atoms;and a compound represented by the general formula (II) or (III) ##STR1## wherein R.sup.3, R.sup.4, R.sup.5 and R.sup.
    Type: Grant
    Filed: July 3, 1980
    Date of Patent: January 19, 1982
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroyuki Mifune, Shunji Takada, Yoshitaka Akimura, Nobuo Sakai
  • Patent number: 4288535
    Abstract: A process for preparing silver halide emulsions having high sensitivity and contrast by adding water-soluble iridium compounds during precipitation or physical ripening and adding water-soluble iodide compounds and sulfer sensitizers during chemical ripening.
    Type: Grant
    Filed: May 19, 1980
    Date of Patent: September 8, 1981
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Hideo Kanisawa, Tamio Kitahata, Hideo Horie
  • Patent number: 4273862
    Abstract: Direct-positive silver halide photographic sensitive materials of high sensitivity and capable of forming a high-contrast image are obtained by incorporating anion-type cyanine dyes having a polarographic oxidation halfwave potential not less positive than +0.4 V in externally fogged direct-positive silver halide emulsions containing not less than 70 mole-% of bromide. Additional incorporation of a development accelerator such as 2-mercaptoimidazoline improves developability.
    Type: Grant
    Filed: September 24, 1979
    Date of Patent: June 16, 1981
    Assignee: Mitsubishi Paper Mills, Ltd.
    Inventors: Akio Yoshida, Seigo Ebato
  • Patent number: 4272606
    Abstract: A method of forming an extremely high-contrast negative photographic image which comprises image-wise exposing a photographic light-sensitive material comprising a support having thereon a mono-disperse silver halide emulsion layer containing surface latent image type silver halide grains and also containing a compound represented by the following general formula (1):R.sup.1 NHNHCOR.sup.2 (I)wherein R.sup.1 represents an aryl group, R.sup.2 represents a hydrogen atom, a phenyl group or an unsubstituted alkyl group having 1 to 3 carbon atoms, and then processing the exposed light-sensitive material in the presence of a compound having a thioamido moiety in the molecule thereof.
    Type: Grant
    Filed: February 1, 1980
    Date of Patent: June 9, 1981
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroyuki Mifune, Shunji Takada, Yoshitaka Akimura, Yoshiharu Fuseya
  • Patent number: 4272614
    Abstract: A silver halide photographic light-sensitive material having at least one silver halide photographic emulsion layer comprising substantially surface latent image type silver halide grains, and containing in said photographic emulsion layer or at least one of other hydrophilic colloid layers a compound represented by the following general formula (I): ##STR1## wherein R.sup.1 represents a hydrogen atom, an aliphatic group which may be substituted or an aromatic group which may be substituted; Ar represents a divalent aromatic group which may be substituted; Y represents a divalent linking group; n represents 0 or 1; R.sup.2 represents a hydrogen atom, an aliphatic group which may be substituted or an aromatic group which may be substituted; and Z represents a nonmetallic atomic group necessary to form a 5-membered or 6-membered heterocyclic ring together with the ##STR2## linkage.
    Type: Grant
    Filed: December 20, 1979
    Date of Patent: June 9, 1981
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroyuki Mifune, Shigeo Hirano
  • Patent number: 4269929
    Abstract: High contrast development of photographic elements, such as lithographic films used in the field of graphic arts, is carried out in the presence of a hydrazine compound with an aqueous alkaline developing solution which has a pH of above 10 and below 12 and contains a dihydroxybenzene developing agent, a 3-pyrazolidone developing agent, a sulfite preservative, and a contrast-promoting amount of an amino compound. The developing solution combines the advantages of high capacity, a high degree of stability, and a long effective life, while providing excellent contrast and speed characteristics.
    Type: Grant
    Filed: January 14, 1980
    Date of Patent: May 26, 1981
    Assignee: Eastman Kodak Company
    Inventor: Ronald J. Nothnagle
  • Patent number: 4268620
    Abstract: A light-sensitive silver halide photographic material containing a tetrazolium compound, is treated with a developing solution containing no hydroquinone developing agent, which material comprises a support and a silver halide emulsion layer coated thereon, containing silver halide grains having an average grain size of 0.05 to 1.5.mu., at least 75% of said grains being within a range of 0.6 to 1.4 times the said average grain size and a sensitizing dye.
    Type: Grant
    Filed: January 16, 1978
    Date of Patent: May 19, 1981
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Tateshi Iytaka, Syunji Matsuo, Toshio Nagatani, Kazuo Takahashi, Takeshi Habu
  • Patent number: 4266003
    Abstract: A silver halide photographic emulsion which comprises at least one compound represented by the formula (I): ##STR1## where Z represents an atomic group necessary to complete an oxazole nucleus, a benzoxazole nucleus or a naphthoxazole nucleus, R.sub.1 represents a substituted or unsubstituted alkyl group, R.sub.2 represents an alkoxycarbonylalkyl group, a hydroxyalkyl group, a hydroxyalkoxyalkyl group, a carbamoylalkyl group, a hydroxyphenyl group or a hydroxyalkylphenyl group, and R.sub.3 and R.sub.4 which may be the same or different each represents a hydrogen atom, an alkyl group, an alkoxy group, a chlorine atom or a carboxyl group, and a lithographic silver halide material containing the same.
    Type: Grant
    Filed: September 25, 1979
    Date of Patent: May 5, 1981
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tadashi Ikeda, Takeo Sakai, Haruo Takei, Noriyuki Inoue
  • Patent number: 4247620
    Abstract: A light-sensitive silver halide photographic material which comprises a compound represented by general formula [I] shown below:General formula [I] ##STR1## wherein A represents a phosphorus atom, a nitrogen atom or an arsenic atom; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represent a substituted or unsubstituted aryl group; X represents a persulfate ion, a chlorate ion, a bromate ion, an iodate ion or a metal complex anion; and n is an integer of 1 to 4,and a method for processing the same.
    Type: Grant
    Filed: June 18, 1979
    Date of Patent: January 27, 1981
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Toshio Nagatani, Kazuo Takahashi, Takeshi Habu
  • Patent number: 4243739
    Abstract: A silver halide photographic light-sensitive material having at least one silver halide photographic emulsion layer comprising substantially surface latent image type silver halide grains, and containing in said photographic emulsion layer or at least one of other hydrophilic colloid layers a compound represented by the following general formula (I): ##STR1## wherein X.sup.1 represents a group containing a ##STR2## moiety, Ar.sup.1 and Ar.sup.2 each represents a substituted or unsubstituted aromatic group, B represents a divalent linking group, n is 0 or 1, and R.sup.1 represents a hydrogen atom, an unsubstituted alkyl group, or a substituted or unsubstituted aryl group.
    Type: Grant
    Filed: October 11, 1979
    Date of Patent: January 6, 1981
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroyuki Mifune, Shunji Takada, Yoshitaka Akimura, Shigeo Hirano
  • Patent number: 4237214
    Abstract: A process for forming a very contrasty negative photographic image which comprises developing a photographic light-sensitive material comprising a support having thereon at least one layer of a negative image monodispersed silver halide photographic emulsion comprising substantially surface latent image type silver halide grains, wherein the average grain size of the silver halide grains is 0.7 micron or less, with the silver halide photographic emulsion containing a binder in an amount of 250 g or less per mol of silver halide, and at least one hydrographic colloid layer containing a compound represented by the following general formula (I):R.sup.1 NHNHCOR.sup.2 (I)wherein R.sup.1 represents an aryl group and R.sup.2 represents a hydrogen atom, a phenyl group or an alkyl group having 1 to 3 carbon atoms, in the presence of a compound represented by the following general formula (II) or (III): ##STR1## wherein Z.sup.1 and Z.sup.
    Type: Grant
    Filed: July 5, 1979
    Date of Patent: December 2, 1980
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroyuki Mifune, Shunji Takada, Yoshitaka Akimura, Nobuyuki Tsujino
  • Patent number: 4233400
    Abstract: Light-sensitive silver halide photographic materials to be treated with a hydroquinones-containing developing solution which material comprises a support and at least one hydrophilic colloidal layer coated thereon containing silver halide grains having an average grain size of 0.05 to 1.5.mu. and a tetrazolium compound and a method of processing thereof.
    Type: Grant
    Filed: March 2, 1979
    Date of Patent: November 11, 1980
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Mitsuto Fujiwhara, Syunji Matsuo, Toyoaki Masukawa, Yutaka Kaneko, Mikio Kawasaki
  • Patent number: 4230792
    Abstract: The present invention provides a lithographic printing plate, which is made by exposing a photographic material having a silver halide photosensitive emulsion layer, developing the exposed material and treating the developed material with a conversion liquid comprising a solvent for a silver halide and an organic compound capable of forming a compound which is more stable and has a lower solubility than a soluble silver complex formed by said solvent.
    Type: Grant
    Filed: January 4, 1979
    Date of Patent: October 28, 1980
    Assignee: Mitsubishi Paper Mills, Ltd.
    Inventors: Yasuo Tsubai, Akio Yoshida, Shigeyoshi Suzuki
  • Patent number: 4230796
    Abstract: High speed litho film in which short-life development accelerators such as cysteine methyl ester and its analogues are incorporated into the silver halide emulsion layer.
    Type: Grant
    Filed: September 22, 1978
    Date of Patent: October 28, 1980
    Assignee: E. I. Du Pont De Nemours and Company
    Inventors: Herbert Gunther, Herbert Blank
  • Patent number: 4221864
    Abstract: Light-sensitive silver halide photographic materials which comprise a support, a hydrophilic colloidal layer coated thereon which contains a silver halide emulsion layer and tetrazolium compounds, said silver halide emulsion layer containing a combination of two types of specific sensitizing dyes.
    Type: Grant
    Filed: April 30, 1979
    Date of Patent: September 9, 1980
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Tateshi Iytaka, Syunji Matsuo, Toshio Nagatani, Kazuo Takahashi, Takeshi Habu
  • Patent number: 4221858
    Abstract: In a process for preparing a planographic printing plate which comprises imagewise exposing a silver halide photosensitive material comprising a support having thereon a tanning-developable silver halide photosensitive layer; tanning developing the exposed photosensitive material and washing out the untanned areas of the photosensitive layer; the improvement comprising the silver halide photosensitive layer further contains finely divided particles of an oleophilic synthetic resin in which the particles are substantially insoluble in water, are non-permeable to an alkaline solution and are not dissolved during the tanning development.
    Type: Grant
    Filed: July 27, 1978
    Date of Patent: September 9, 1980
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Keisuke Shiba, Kesanao Kobayashi
  • Patent number: 4211835
    Abstract: A method of processing light-sensitive silver halide photographic material to be treated with a developing solution containing no hydroquinones developing agent, which material comprises a support, a silver halide emulsion layer coated thereon containing silver halide grains having an average grain size of 0.1 to 0.8.mu., at least 75% of said grains being within a range of 0.6 to 1.4 times the said average grain size, and a tetrazolium specified compound.
    Type: Grant
    Filed: January 16, 1978
    Date of Patent: July 8, 1980
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Yoshio Nishina, Syunji Matsuo, Toshio Nagatani, Kazuo Takahashi, Takeshi Habu
  • Patent number: 4210715
    Abstract: Light-sensitive silver halide photographic materials to be treated with a hydroquinones-containing developing solution which material comprises a support and at least one hydrophilic colloidal layer coated thereon which contains silver halide grains having an average grain size of 0.05 to 1.5.mu., a tetrazolium compound and a sensitizing dye.
    Type: Grant
    Filed: March 2, 1979
    Date of Patent: July 1, 1980
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Mitsuto Fujiwhara, Syunji Matsuo, Toyoaki Masukawa, Yutaka Kaneko, Mikio Kawasaki
  • Patent number: 4192682
    Abstract: Process of forming a high-contrast silver image which process comprises treating a light-sensitive silver halide photographic material comprising a support, a silver halide emulsion layer coated thereon and another hydrophilic colloidal layer, at least one of which contains a substantially non-diffusible compound having oxidation power on a hydroquinone developing agent, with a developer containing no hydroquinone developing agent after exposed imagewise.
    Type: Grant
    Filed: January 16, 1978
    Date of Patent: March 11, 1980
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Yoshio Nishina, Syunji Matsuo, Toshio Nagatani, Kazuo Takahashi, Takeshi Habu