Azo Patents (Class 430/519)
  • Patent number: 5290669
    Abstract: A silver halide color photographic light-sensitive material having photographic component layers on a support and at least one layer of which contains a silver salt of dye, is disclosed. The material has properties of high sharpness, high speed, less fogging and excellent raw stock stability.
    Type: Grant
    Filed: June 29, 1992
    Date of Patent: March 1, 1994
    Assignee: Konica Corporation
    Inventors: Shigeto Hirabayashi, Yasushi Usagawa, Nobuaki Kagawa, Yasuhiko Kawashima
  • Patent number: 5252447
    Abstract: A silver halide color photographic material comprising:a reflective support having thereonat least one light-sensitive silver halide emulsion layer,wherein the reflective support comprises a support substrate covered with a water resisting resin layer,wherein the water resisting resin layer, on the side of the silver halide light-sensitive layer, contains titanium oxide grains in an amount of 14 wt % or more,wherein the photographic material has an optical reflection density of 0.70 or above at 680 nm, andwherein the light-sensitive silver halide emulsion layer contains at least one nondiffusible oil-soluble coupler, which forms a dye on coupling with the oxidation product of an aromatic primary amine color developing agent, dispersed therein together with at least one water-insoluble homo- or copolymer.
    Type: Grant
    Filed: March 5, 1993
    Date of Patent: October 12, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigeaki Ohtani, Shigeru Ohno
  • Patent number: 5198323
    Abstract: A resist composition comprising an alkali-soluble resin, a 1,2-quinone diazide compound and a compound of the general formula (I): ##STR1## wherein Z is an oxygen or sulfur atom or a group of the formula: >N--R.sub.4 in which R.sub.4 is a hydrogen atom or an alkyl group; R.sub.1, R.sub.2 and R.sub.3 are the same or different and independently a hydrogen atom, a substituted or unsubstituted alkyl group, a halogen atom, a hydroxyl group, a cyano group or a group of the formula: --OCOR" in which R" is a substituted or unsubstituted alkyl group; and X and Y are independently a cyano group or a group of the formula: ##STR2## --COOR or --CONHR' in R is an alkyl group and R' is a hydrogen atom or an aryl group, which is suitable for the formation of very fine patterns on a substrate having a high reflectance.
    Type: Grant
    Filed: April 30, 1991
    Date of Patent: March 30, 1993
    Assignee: Sumitomo Chemical Co., Ltd.
    Inventors: Teijiro Kitao, Masaru Matsuoka, Ryotaro Hanawa, Yasunori Uetani, Naoki Takeyama, Takeshi Hioki, Hiroshi Takagaki
  • Patent number: 5169748
    Abstract: A high resolution radiography system is presented utilizing a an intensifying screen incorporating a UV emitting phosphor. The photographic element exhibits enhanced sensitivity to the emission of the phosphor and further comprises at least one compound selected from the group comprising: ##STR1## wherein R.sub.1 =substituted or unsubstituted aromatic ring; R.sub.2 =H, substituted or unsubstituted alkyl or substituted or unsubstituted aryl; R.sub.3 =an alkyl group, an aryl group, a COOR group wherein R is hydrogen, alkyl, aryl or an alkali metal cation, HNR4+ wherein R.sub.4 is alkyl, substituted alkyl or alkyaryl.
    Type: Grant
    Filed: November 7, 1991
    Date of Patent: December 8, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Bernard A. Apple, Dietrich M. Fabricius, Joseph T. Guy
  • Patent number: 5116717
    Abstract: A silver halide photographic material composed of a support having thereon at least one silver halide photosensitive emulsion layer, at least one layer of the material containing a blocked photographic reagent precursor represented by formula (I): ##STR1## wherein X.sub.1 represents a divalent linking group containing a hetero atom bonded to the carbon atom, provided that X.sub.1 is linked to the carbon atom by a group other than ##STR2## PUG represents a photographically useful group containing a hetero atom bonded to X.sub.1 ; W represents .dbd.N-- or ##STR3## Y.sub.1 represents hydrogen or a group capable of being substituted; Z represents an atomic group necessary for forming a heterocyclic ring, provided that when W represents a ##STR4## the group adjacent to W in the heterocyclic ring is a group other than ##STR5## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.
    Type: Grant
    Filed: February 25, 1991
    Date of Patent: May 26, 1992
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tetsunori Matsushita, Morio Yagihara
  • Patent number: 4980276
    Abstract: A silver halide light-sensitive photographic material having an improved safe-light insensitivity and, therefore, capability of being easily handled in the light room is disclosed. The material comprises a support; at least one silver halide emulsion layer being provided on one side of the support and containing silver halide grains containing at least 50 mol % of silver chloride, 10.sup.-4 to 10.sup.-8 mol per 1 mol of silver halide of a rhodium salt and a desensitizing dye; and at least one hydrophilic colloidal layer being provided on the other side of the support and containing at least one dye so that the absorbancy of the dye at the maximum spectral sensitivity wavelength (.lambda.max) of the densenitizing dye is not less than 0.3 and the absorbance ratio at the maximum spectral sensitivity wavelength against that at 450 nm is not less than 0.2.
    Type: Grant
    Filed: April 24, 1990
    Date of Patent: December 25, 1990
    Assignee: Konica Corporation
    Inventors: Takeo Arai, Toshiharu Nagashima
  • Patent number: 4956269
    Abstract: A silver halide color photographic material comprising a support having thereon at least one red-sensitive silver halide emulsion layer, at least one green-sensitive silver halide emulsion layer and at least one blue-sensitive silver halide emulsion layer, wherein each of the green-sensitive silver halide emulsion layer, the red-sensitive silver halide emulsion layer and the blue-sensitive silver emulsion layer contains at least one color image forming coupler, and wherein 50% or more of the total projected area of the silver halide grains in at least one of the emulsion layers comprises tabular silver halide grains having a thickness of less than 0.5 .mu.m, a diameter of 0.6 .mu.
    Type: Grant
    Filed: November 27, 1989
    Date of Patent: September 11, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hideo Ikeda, Shigeru Ohno
  • Patent number: 4948720
    Abstract: The present invention provides a photographic element that includes an antistatic composition comprising a polyphosphazene comprising repeating units of the formula: ##STR1## and a salt that complexes with the polyphosphazene. In the above formula, x, y, R.sub.1, R.sub.4, R.sub.5, W, X, Y, and Z are as defined herein.
    Type: Grant
    Filed: January 6, 1989
    Date of Patent: August 14, 1990
    Assignee: Eastman Kodak Company
    Inventors: Janglin Chen, Wayne T. Ferrar, James E. Kelly, Akemi S. Marshall
  • Patent number: 4894313
    Abstract: Photosensitive recording elements which possess a photosensitive recording layer which is applied to a dimensionally stable base, if necessary via one or more intermediate layers, and have good photochemical properties and a long shelf life contain a compound of the general formula (I) ##STR1## where M is a hydrogen atom or proton, an alkali metal cation, the ammonium cation or an amine cation and R.sup.1 and R.sup.2 are identical or different and are each a substituted s-triazine ring, in the photosensitive recording layer and/or any intermediate layer present, in order to control the photochemical properties.
    Type: Grant
    Filed: May 12, 1987
    Date of Patent: January 16, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Peter Neumann, Guenter Wallbillich
  • Patent number: 4871655
    Abstract: A light-sensitive silver halide color photographic material, comprising at least one photographic constituent layer containing a multi-functional dye which becomes substantially colorless in the presence of the oxidized product of a color developing agent through the reaction with the oxidized product, and becomes substantially colorless in the absence of the oxidized product of the color developing agent during the color-photographic processing step.According to the present invention, a color light-sensitive material containing a multi-functional compound having excellent sharpness, good color reproducibility and further excellent graininess can be obtained.
    Type: Grant
    Filed: December 30, 1987
    Date of Patent: October 3, 1989
    Assignee: Konica Corporation
    Inventors: Mitsuto Fujiwhara, Takashi Uchida, Toshihiko Kimura
  • Patent number: 4857637
    Abstract: The activity of growth-associated receptors is modulated in vivo in a controlled and reproducible fashion by immunizing animals against target growth-associated receptors. This is accomplished by the use of immunogens predetermined to induce primarily agonist or antagonist responses. The immunogens include anti-ligand antibodies and receptor derivatives.
    Type: Grant
    Filed: June 12, 1987
    Date of Patent: August 15, 1989
    Assignee: Genentech, Inc.
    Inventors: R. Glenn Hammonds, David W. Leung, David W. Martin, Jr., Steven A. Spencer, William I. Wood
  • Patent number: 4711830
    Abstract: An image recording material is provided which comprises an electroconductive base plate, a recording layer provided on at least one side of said plate and a photosensitive layer provided on said recording layer. The recording layer may constituted of a electrolytically polymerized film, and the photosensitive layer may constituted of a polymer complex formed from a basic polymer and an acidic polymer. A method for image recording is also provided.
    Type: Grant
    Filed: January 22, 1986
    Date of Patent: December 8, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masahiro Haruta, Yoko Kuwae, Satoshi Yuasa, Toshihiko Miyazaki
  • Patent number: 4654292
    Abstract: A photoresist composition comprising a conjugated diene polymer or its cyclized product, a photocuring agent soluble in an organic solvent and a pyrazole compound having a skeleton represented by the following formula. ##STR1## Also provided is a method of forming a photoresist pattern using the aforesaid composition.
    Type: Grant
    Filed: September 17, 1985
    Date of Patent: March 31, 1987
    Assignees: Nippon Zeon Co., Ltd., Fujitsu Limited
    Inventors: Masayuki Oie, Satoshi Ogawa, Sadao Sugimoto, Masahiro Yamazaki, Katsuhiro Fujino
  • Patent number: 4619893
    Abstract: A light-sensitive material for a silver salt diffusion transfer process is described, having an antihalation layer containing at least one oil-soluble dye represented by following general formula (I) ##STR1## wherein X represents a benzene ring, a thiazole ring or a benzothiazole ring each having at least one electron attractive group selected from a nitro group, a cyano group, an alkylsulfonyl group, a halogen atom, and a trifluoromethyl group; R.sub.1, R.sub.2, R.sub.3, R.sub.4 each represents hydrogen, a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 12 carbon atoms, a substituted or unsubstituted alkylamido group having 2 to 30 carbon atoms or a substituted or unsubstituted arylamido group having 6 to 30 carbon atoms; any Y and Z each represents hydrogen or a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms.
    Type: Grant
    Filed: February 11, 1985
    Date of Patent: October 28, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoshihiro Takagi, Keiichi Adachi
  • Patent number: 4618565
    Abstract: Multilayer photoresist recording media containing an absorptive layer are improved by forming the absorptive layer from a composition comprising PMMA or a copolymer of methylmethacrylate and methacrylic acid, certain dyes such as hydroxyazobenzoic acid or Sudan Orange G and a suitable solvent. The dyes are insoluble in the solvent of an overlying photoresist layer. The media are substantially free of loss of resolution due to dissolution of the dye into the photoresist layer.
    Type: Grant
    Filed: June 5, 1985
    Date of Patent: October 21, 1986
    Assignee: RCA Corporation
    Inventors: Lawrence K. White, Nancy A. Miszkowski, Aaron W. Levine
  • Patent number: 4607003
    Abstract: A photographic element comprising a support and at least one silver halide emulsion layer. The photographic element contains at least one layer containing at least one of the dyes represented by the following formula (I), (II), (III), (IV), (V), (VI), (VII) or (VIII): ##STR1## wherein Z.sub.1 to Z.sub.10 ; R.sub.1 to R.sub.24 ; L.sub.1 to L.sub.18 ; Y.sub.1 to Y.sub.8 ; Q.sub.1 to Q.sub.4 ; X.sub.1 to X.sub.3 ; Ar; h, m, p and r; and t.sub.1 to t.sub.3 are described in the specification.
    Type: Grant
    Filed: April 9, 1985
    Date of Patent: August 19, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Toshinao Ukai, Tadahisa Sato, Toshio Kawagishi, Haruo Takei
  • Patent number: 4598030
    Abstract: Photographic elements, diffusion transfer assemblages and coordination complexes are described which employ a novel nondiffusible compound capable of releasing at least one diffusible dye moiety having the formula: ##STR1## wherein: (a) D.sup.1, D.sup.2 and D.sup.3 each independently represents the atoms necessary to complete an aromatic heterocyclic nucleus having at least one ring of 5 to 7 atoms;(b) Z.sup.1 and Z.sup.2 each independently represents the atoms necessary to complete an aromatic carbocyclic or heterocyclic nucleus having at least one ring of 5 to 7 atoms or a ketomethine group;(c) G.sup.1 and G.sup.2 each independently represents a metal chelating group;(d) Me is a polyvalent, hexacoordinate metal ion,(e) CAR represents a ballasted carrier moiety capable of releasing the diffusible dye moiety as a function of development of the silver halide emulsion layer under alkaline conditions; and(f) n is 1, 2 or 3.
    Type: Grant
    Filed: August 2, 1985
    Date of Patent: July 1, 1986
    Assignee: Eastman Kodak Company
    Inventor: James A. Reczek
  • Patent number: 4581323
    Abstract: A photothermographic element comprising a reflective base having coated thereon one or more layers constituting a photothermographic imaging medium in which a bleachable antihalation medium is coated over said photothermographic imaging medium, the components of the antihalation medium being in non-reactive association with components in the photothermographic imaging medium. The topcoat antihalation layer allows a wide latitude in the selection of dye bleach systems and binders and surprisingly is at least as effective as the use of antihalation underlayers.
    Type: Grant
    Filed: March 12, 1984
    Date of Patent: April 8, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Michael G. Fisher, Gebran J. Sabongi, Stephen S. C. Poon
  • Patent number: 4559296
    Abstract: New dyes corresponding to the following general formula: ##STR1## wherein the substituents are as defined in the specification, are suitable for use in photographic recording materials.
    Type: Grant
    Filed: April 25, 1984
    Date of Patent: December 17, 1985
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Peter Bergthaller, Lothar Rosenhahn, Karl J. Herd, Hauke Fuerstenwerth, Rudolf Stolzenburg
  • Patent number: 4500631
    Abstract: A radiographic image forming process comprising imagewise exposing a negative type silver halide light-sensitive photographic material in combination with a fluorescent intensifying screen to radiation and then treating said material with a processing solution, said material comprising a support and constituent layers coated on both sides of said support, said layers containing(a) light sensitive silver halide particles,(b) metallic salt particles which are not light-sensitive and, when untreated, are more soluble in said processing solution than said silver halide particles, said metallic salt particles having been treated so that the surface thereof has been rendered less soluble than said silver halide by a dissolution retarder,(c) physical development nuclei, and(d) compounds selected from water soluble dyes having absorption maxima in an aqueous solution of from 400 to 600 nm or compounds selected from said water soluble dyes coupled to a non-diffusive mordant, andsaid processing solution containing at l
    Type: Grant
    Filed: August 5, 1983
    Date of Patent: February 19, 1985
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Eiichi Sakamoto, Mikio Kawasaki, Kouji Ono, Kakujulo Fukuoji, Noboru Fujimori
  • Patent number: 4476207
    Abstract: Photographic elements, diffusion transfer assemblages, coordination complexes and processes are described which employ a novel nondiffusible compound capable of releasing at least one diffusible cyan dye moiety comprising a 6-heterocyclylazo-3-pyridinol, the compound having the formula: ##STR1## wherein: (a) Y represents the atoms necessary to complete a 5- or 6-membered aromatic heterocyclic fused ring;(b) CAR represents a ballasted carrier moiety capable of releasing the diffusible cyan dye moiety as a function of development of a silver halide emulsion layer under alkaline conditions;(c) R represents a hydroxy group, a salt thereof, or a hydrolyzable precursor thereof, or CAR which is linked to the dye moiety through an oxygen atom thereon; and(d) n is 0, 1 or 2 with the proviso that when n is 0, then R is CAR which is linked to the dye moiety through an oxygen atom thereon.
    Type: Grant
    Filed: February 9, 1984
    Date of Patent: October 9, 1984
    Assignee: Eastman Kodak Company
    Inventors: James A. Reczek, James K. Elwood
  • Patent number: 4436799
    Abstract: Photographic elements, diffusion transfer assemblages, coordination complexes and processes are described which employ a novel nondiffusible compound capable of releasing at least one diffusible magenta dye moiety comprising a 4-(2-heterocyclylazo)phenol having a heterocyclic ring fused thereto, the compound having the formula: ##STR1## wherein: (a) X represents the atoms necessary to complete a 5- or 6-membered heterocyclic ring;(b) Y represents the atoms necessary to complete a 5- or 6-membered heterocyclic fused ring;(c) CAR represents a ballasted carrier moiety capable of releasing the diffusible magenta dye moiety as a function of development of a silver halide emulsion layer under alkaline conditions;(d) R represents a hydroxy group, a salt thereof, or a hydrolyzable precursor thereof, or CAR which is linked to the dye moiety through an oxygen atom thereon; and(e) n is 0, 1 or 2, with the proviso that when n is 0, then R is CAR which is linked to the dye moiety through an oxygen atom thereon.
    Type: Grant
    Filed: June 15, 1983
    Date of Patent: March 13, 1984
    Assignee: Eastman Kodak Company
    Inventors: Steven Evans, James K. Elwood
  • Patent number: 4426327
    Abstract: The present invention provides disazo compounds expressed by the general formula ##STR1## [wherein A represents ##STR2## (wherein R represents alkyl radical, alkoxy radical, nitro radical, dialkylamino radical or halogen, n is 0 or an integer ranging from 1 to 3, and R may be identical or different when n is an integer of 2 or 3)]; a process for the preparation of said compounds; and photosensitive materials having a high sensitivity as well as a high flexibility which comprises a conductive support and a photosensitive layer formed thereon, said photosensitive layer containing a disazo pigment, as an effective ingredient, which is expressed by the general formula ##STR3## [wherein R' represents a member selected from the group consisting of hydrogen, ethyl radical, chloroethyl radical and hydroxyethyl radical, A' represents a member selected from the group consisting of ##STR4## (wherein X represents a member selected from the group consisting of aromatic rings such as benzene ring, naphthalene ring, etc.
    Type: Grant
    Filed: November 5, 1980
    Date of Patent: January 17, 1984
    Assignee: Ricoh Co., Ltd.
    Inventors: Mitsuru Hashimoto, Masafumi Ohta, Akio Kozima, Kiyoshi Sakai, Masaomi Sasaki
  • Patent number: 4419431
    Abstract: This invention relates to a one- or two-component diazo-type material with improved light stability and duplication capabilities. This is accomplished by using compounds of the general formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 being the same or different, represent hydrogen, alkyl with 1 to 5 carbon atoms, R.sub.1 and R.sub.2 and/or R.sub.3 and R.sub.4 represent the alkyl groups necessary for completion of a 5- or 6-membered heterocyclic ring, wherein the ring may comprise a further hetero atom, such as N, O or S;R.sub.5, R.sub.6 being the same or different, represent hydrogen, aryl, alkyl with 1 to 4 carbon atoms;Y represents --S--, --SO--, --SO.sub.2 --; andn is 0, 1, 2, 3,which are added to the material as fading inhibitors. These compounds can be easily synthesized and are compatible with the system, having an absorption maximum below 380 nm and reduced fogging tendency. They may also be employed in the form of their hydro salts.
    Type: Grant
    Filed: November 30, 1981
    Date of Patent: December 6, 1983
    Assignee: VEB Filmfabrik Wolfen
    Inventors: Regina Lischewski, Jorg Marx, Reinhard Walter, Peter Mockel
  • Patent number: 4418131
    Abstract: Photographic elements, diffusion transfer assemblages, coordination complexes and processes are described which employ a novel nondiffusible compound having a releasable yellow dye moiety or precursor thereof, the compound having the formula: ##STR1## wherein: (a) X represents the atoms necessary to complete a 5- or 6-membered aromatic heterocyclic fused ring;(b) Z represents alkyl, substituted alkyl, aryl or substituted aryl;(c) R represents CN or J-L;(d) J represents a bivalent ##STR2## (e) L represents alkyl, substituted alkyl, aryl, substituted aryl, or can be taken together with Z to complete a carbonyl-containing 5- or 6-membered heterocyclic or carbocyclic ring;(f) Z.sup.
    Type: Grant
    Filed: April 14, 1983
    Date of Patent: November 29, 1983
    Assignee: Eastman Kodak Company
    Inventor: Steven Evans
  • Patent number: 4346155
    Abstract: Photographic elements, diffusion transfer assemblages and processes are described which employ a novel nondiffusible compound having a releasable 6-arylazo-3-pyridinol magenta dye moiety or precursor thereof having the formula: ##STR1## wherein: (a) R represents hydroxy or amino;(b) R.sup.1 represents hydrogen, a hydrolyzable moiety or CAR;(c) G represents carboxy; a hydrolyzable ester or a sulfamoyl group;(d) CAR represents a ballasted carrier moiety capable of releasing the diffusible 6-arylazo-3-pyridinol dye moiety or precursor thereof under alkaline conditions; and(e) n is 0, 1 or 2, with the proviso that when n is 0, then R.sup.1 is CAR.
    Type: Grant
    Filed: August 24, 1981
    Date of Patent: August 24, 1982
    Assignee: Eastman Kodak Company
    Inventors: Derek D. Chapman, James A. Reczek
  • Patent number: 4336323
    Abstract: A light insensitive imageable layer comprising a synthetic polymeric binder, a dye, a nitrate salt, and an acid.
    Type: Grant
    Filed: October 22, 1980
    Date of Patent: June 22, 1982
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: John M. Winslow
  • Patent number: 4317875
    Abstract: This invention relates to a recording material containing diazo compounds, in particular a microfilm, comprising a film base which is at least partially pervious to visible radiation, a light-sensitive layer and, on the reverse side of the film base, a filter layer which absorbs light in the long-wave ultraviolet spectral range and in the short-wave visible spectral range, wherein the filter layer is composed of a polymer which is insoluble or has been rendered insoluble by cross-linking, and of at least one yellow to orange-colored dye which is compatible with the constituents of the polymer and absorbs light in the range between about 360 nm and about 500 nm. The invention also relates to a process for the manufacture of a recording material.
    Type: Grant
    Filed: October 27, 1980
    Date of Patent: March 2, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Siegfried Scheler, Klaus Thoese
  • Patent number: 4298676
    Abstract: Optical filter agents and photographic products and processes using same are disclosed. The optical filter agents are pH-sensitive hydrazone compounds conforming to the following structural formula: ##STR1## where R is any group which can provide a double bond for conjugation with the ##STR2## portion of the compound to provide light-absorbing capability or color for the agent at a pH above its pKa, X is a substituent of R providing at least one electron-withdrawing group and each R' can be defined as any substituent that does not impair the light-absorbing capacity of the compound at a pH above the pKa thereof. The pH-sensitive optical filter agents have a highly colored light-absorbing form at a pH above the pKa and are substantially non-absorbing at a pH below the pKa. The pH-sensitive optical filter agents are useful in photographic film units and processes for the protection of photoexposed photosensitive elements against the occurence of fogging during in-light development.
    Type: Grant
    Filed: October 29, 1979
    Date of Patent: November 3, 1981
    Assignee: Polaroid Corporation
    Inventors: Derek H. R. Barton, Irena Y. Bronstein-Bonte, Lloyd D. Taylor
  • Patent number: 4287289
    Abstract: A novel photoresist composition is proposed which is very advantageously employed in the photoetching process for the manufacture of various kinds of electronic devices such as transistors, ICs, LSIs and the like. The photoresist composition of the invention comprises a cyclized rubber as the base component and a specified azobenzene compound as a photoextinction agent for preventing halation in the exposure of the photoresist films to ultraviolet light. The advantages of the inventive photoresist composition over the conventional ones are obtained in the remarkable stability of the halation preventing effect even after a prebaking treatment of the photoresist films at an elevated temperature to remove the solvent from the photoresist films applied on to the substrate surfaces owing to the unexpectedly small sublimation of the azobenzene compound contained in the photoresist films.
    Type: Grant
    Filed: June 19, 1979
    Date of Patent: September 1, 1981
    Assignee: Tokyo Ohka Kogyo Kabushiki Kaisha
    Inventor: Takayuki Sato
  • Patent number: 4276373
    Abstract: A photosensitive recording material containing at least one silver halide layer and an azo dye is disclosed.
    Type: Grant
    Filed: March 19, 1980
    Date of Patent: June 30, 1981
    Assignee: AGFA-Gevaert, A.G.
    Inventors: Hans Ohlschlager, Lothar Rosenhahn, Wolfgang Sauerteig
  • Patent number: 4269925
    Abstract: Polymeric optical filter agents and photographic products and processes using same are disclosed. The polymeric optical filter agents are pH-sensitive optical filter agents comprising polymeric backbone units having the following hydrazone moiety: ##STR1## where R is a group which can provide a double bond for conjugation with the ##STR2## portion of the moiety to provide light-absorbing capability for the agent at a pH above its pKa, and X represents a substituent of R providing at least one electron-withdrawing group. The polymeric pH-sensitive optical filter agents have a highly colored light-absorbing form at a pH above the pKa and are substantially non-absorbing at a pH below the pKa. The polymeric optical filter agents are useful in photographic film units and processes for the protection of photoexposed photosensitive elements against the occurence of fogging during in-light development.
    Type: Grant
    Filed: October 29, 1979
    Date of Patent: May 26, 1981
    Assignee: Polaroid Corporation
    Inventors: Derek H. R. Barton, Irena Y. Bronstein-Bonte, Lloyd D. Taylor
  • Patent number: 4203716
    Abstract: This invention is directed to photographic elements having hydrophilic colloid layers containing loaded particles of from 0.02 to 0.2 micron in average diameter consisting essentially of a loadable polymer, with greater than 2 percent by weight of the polymer being derived from monomers capable of forming water soluble homopolymers. A hydrophobic photographic dye, coupler, developing agent or ultraviolet absorbing compound is loaded into and distributed through the particles. The weight ratio of the hydrophobic photographic dye, coupler, developing agent or ultraviolet absorbing compound to the loadable polymer is from about 1:4 to 3:1.
    Type: Grant
    Filed: August 23, 1978
    Date of Patent: May 20, 1980
    Assignee: Eastman Kodak Company
    Inventor: Tsang J. Chen
  • Patent number: 4182886
    Abstract: Pyridone dyestuffs of the formula ##STR1## are provided wherein R.sub.1 is hydrogen or an optionally substituted alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radical or an optionally substituted amino group, R.sub.2, R.sub.3, R.sub.4 each independently represent hydrogen, halogen, alkoxy, or optionally substituted alkyl or cycloalkyl, R.sub.5 and R.sub.6 each independently represent hydrogen or an optionally substituted alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radical or R.sub.5 and R.sub.6, R.sub.3 and R.sub.5 and R.sub.4 and R.sub.6 form heterocyclic rings, Y is hydrogen or hydroxy, --CN, --COOR.sub.7, --CONR.sub.7 R.sub.8 or --COR.sub.7 or an optionally substituted alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radical, and Z represents --CN, --COOR.sub.9, --CONR.sub.9 R.sub.10, --SO.sub.3 H, --SO.sub.3 .crclbar. or --COR.sub.9, where R.sub.7, R.sub.8, R.sub.9 and R.sub.
    Type: Grant
    Filed: February 21, 1978
    Date of Patent: January 8, 1980
    Assignee: Ciba-Geigy Aktiengesellschaft
    Inventors: Rainer Kitzing, John G. V. Scott, Terence C. Webb, Graham Evans