Heterocyclic Patents (Class 430/343)
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Patent number: 4840869Abstract: Light sensitive compositions are disclosed which comprise 2-halomethyl-1,3,4,-oxadiazole compounds having a heterocyclic radical in the fifth position containing at least one element selected from the group consisting of oxygen, nitrogen, sulphur, and selenium directly or through a vinyl radical.Type: GrantFiled: August 10, 1987Date of Patent: June 20, 1989Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Noriyasu Kita, Kiyoshi Goto
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Patent number: 4818664Abstract: A process for processing a silver halide color photographic material which comprises processing, after color development, a silver halide color photographic material with a processing solution having a bleaching faculty using an aminopolycarboxylic acid ferric complex salt as an oxidizing agent, said color photographic material comprising a support having thereon at least one light-sensitive silver halide emulsion layer and at least one compound releasing by the reaction with an oxidation product of a developing agent a group releasing or forming development inhibitor by the reaction with another molecule of an oxidation product of a developing agent.Type: GrantFiled: May 20, 1987Date of Patent: April 4, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Shinji Ueda, Keiji Mihayashi, Seiji Ichijima
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Patent number: 4803287Abstract: The invention provides a photochromic material characterized by an improvnt in balance of the substituents in the conventional furylfulgides and represented by the general formula: ##STR1## (wherein R represents an alkyl chain having 5 to 31 carbon atoms). According to this molecular structure, a mutually appropriate steric hindrance is induced between the isopropylidence group and the long-chain alkyl group to make the regio isomer unstable, thus preventing the regio isomer from being by-produced while also inhibiting any isomerization reaction from occuring in the synthesis of the fulgide. Further, a good balance of hydrophilic part and hydrophobic part is produced to facilitate formation of a Langmuir-Blodgett film.Type: GrantFiled: March 9, 1987Date of Patent: February 7, 1989Assignee: Director-General of the Agency of Industrial Science and TechnologyInventors: Junichi Hibino, Eiji Ando
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Patent number: 4772534Abstract: A light-sensitive composition containing a novel light-sensitive s-triazine compound represented by the formula (I) as a free radical-generating agent is disclosed. The s-triazine compound responds radiation in the range of the near ultraviolet to visible light, shows high sensitivity for photolysis and, therefore, the compositon has high light-sensitivity.Type: GrantFiled: September 5, 1986Date of Patent: September 20, 1988Assignee: Fuji Photo Film Co., Ltd.Inventors: Kouichi Kawamura, Hirokazu Kondo, Yoshimasa Aotani
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Patent number: 4737449Abstract: A series of novel 3-pyrryl fulgides and fulgimides are disclosed which are photochromic. The photochromic compounds are coloured by subjecting them to irradiation in the near ultraviolet and will revert to the colourless form on exposure to visible light, especially light having a wavelength in 600 to 650 nm band.Type: GrantFiled: January 24, 1986Date of Patent: April 12, 1988Assignee: The Plessey Company PlcInventors: Harry G. Heller, Stephen N. Oliver, Stuart A. Harris
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Patent number: 4720449Abstract: A thermal imaging method is provided which comprises heating imagewise a di- or triarylmethane compound possessing within its di- or triarylmethane structure an aryl group substituted in the ortho position to the meso carbon atom with a moiety ring-closed on the meso carbon atom directly through a nitrogen atom, which nitrogen atom is also bound to a group with a masked acyl substituent that undergoes fragmentation upon heating to liberate the acyl group for effecting intramolecular acylation of said nitrogen atom to form a new group in the ortho position whereby the di- or triarylmethane compound is rendered colored in an imagewise pattern corresponding to said imagewise heating.Type: GrantFiled: May 14, 1986Date of Patent: January 19, 1988Assignee: Polaroid CorporationInventors: Alan L. Borror, Ernest W. Ellis
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Patent number: 4720450Abstract: A method of thermal imaging is provided which comprises heating imagewise a layer of a colored di- or triarylmethane compound possessing within its di- or triarylmethane structure an aryl group substituted in the ortho-position to the meso carbon atom with a group comprising a thermally unstable urea moiety which fragments upon heating to provide a new group that bonds to the meso carbon atom whereby the di- or triarylmethane compound is rendered ring-closed and colorless in an imagewise pattern corresponding to said imagewise heating.Type: GrantFiled: May 15, 1986Date of Patent: January 19, 1988Assignee: Polaroid CorporationInventor: Ernest W. Ellis
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Patent number: 4702996Abstract: The image of an object with opaque and transparent regions having a contrast lens than the contrast threshold of a layer of photoresist when light of a predetermined wavelength to which the photoresist is sensitive is passed through the object and onto the layer of photoresist is enhanced in contrast by the provision of a contrast enhancing layer contiguous to the surface of the photoresist to a value above the contrast threshold of the photoresist. The contrast enhancing layer is constituted of an aryl nitrone compound mixed with a suitable binder.Type: GrantFiled: May 17, 1985Date of Patent: October 27, 1987Assignee: General Electric CompanyInventors: Bruce F. Griffing, Paul R. West
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Patent number: 4696888Abstract: Light-sensitive compounds are described which have the formula ##STR1## wherein R.sup.1 and R.sup.2 denote H or alkyl, R.sup.3 and R.sup.4 denote H or 4,6-bis-trichloromethyl-s-triazin-2-yl, R.sup.5 and R.sup.6 denote H or halogen, alkyl, alkenyl or alkoxy, and Ar denotes a mononuclear to trinuclear aromatic group.These compounds are suitable as photoinitiators for free-radical polymerizations or as photolytic acid donors for acid-cleavable compounds, and for cross-linking and color formation reactions. They are distinguished by a high sensitivity in various spectral ranges.Type: GrantFiled: July 30, 1986Date of Patent: September 29, 1987Assignee: Hoechst AktiengesellschaftInventor: Gerhard Buhr
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Patent number: 4684598Abstract: An enhanced optically sensitive medium is disclosed which uses an organic charge transfer complex as the switching material. The organic charge transfer complex includes at least one moiety in an oxidized state. An enhancement mechanism is taught which provides a secondary source of neutral molecules of said at least one constituent moiety in the neutral or altered oxidation state. For example, with CuTCNQ used as the switching material, the erasing characteristics can be improved by using a covering dispersion having a matrix polymer interspersed with neutral molecules of TCNQ.degree..Type: GrantFiled: November 23, 1984Date of Patent: August 4, 1987Assignee: The Johns Hopkins UniversityInventors: Richard S. Potember, Theodore O. Poehler
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Patent number: 4659644Abstract: A diazo-type thermosensitive recording material is disclosed, which comprises a support material and a thermosensitive coloring layer formed on the support material, which thermosensitive coloring layer comprises a diazonium compound, a coupler and a thermo-fusible or thermo-softening material, the coupler being a combination of a hydrazone-type coupler of the formula of R.sup.1 --NH--N.dbd.CH--R.sup.2 (wherein R.sup.1 and R.sup.2 are defined in detail in the specification) and a two-valence metal compound capable of chelating with the coupled product produced by the coupling of the diazonium compound and the hydrazone-type coupler.Type: GrantFiled: December 19, 1984Date of Patent: April 21, 1987Assignee: Ricoh Company, Ltd.Inventors: Takayuki Hoshina, Michihisa Takahashi, Masanori Rimoto, Masanaka Nagamoto
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Patent number: 4659649Abstract: The invention provides new compositions which change color on exposure to actinic radiation and contain a photosensitive onium, e.g. iodonium or sulphonium, salt and a dyestuff which changes color when protonated. The compositions may also include a resin, especially a resin curable by the onium salt when the latter is exposed, and preferably an epoxy resin. The compositions are useful especially as coatings, e.g. for making screen stencils or for producing lithographic printing plates.Type: GrantFiled: April 30, 1984Date of Patent: April 21, 1987Assignee: Sericol Group LimitedInventors: Peter Dickinson, Michael Ellwood
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Patent number: 4652514Abstract: An optical information recording medium which comprises the provision of a thin film (recording layer) formed of a cyanine coloring matter and a transition metal complex being superior in long wavelength range light absorbability to said coloring matter on a transparent or opaque substrate and which permits writing and reading by using laser beam.Type: GrantFiled: September 20, 1984Date of Patent: March 24, 1987Assignee: Ricoh Co., Ltd.Inventors: Michiharu Abe, Hideaki Oba
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Patent number: 4622286Abstract: Photoimaging composition comprising an admixture of leuco dye, and at least one 2,4,5-triphenylimidazolyl dimer prepared by an oxidative coupling reaction, a reaction product, 2,2',5-tris-(o-chlorophenyl)-4-(3,4-dimethoxyphenyl)-4',5'-diphenylbiimida zole, being present in an amount of 0.01 to 90.0% by weight based on the weight of solids in the composition. The composition when coated on a support is useful for prepress proofing.Type: GrantFiled: September 16, 1985Date of Patent: November 11, 1986Assignee: E. I. Du Pont de Nemours and CompanyInventor: Thomas M. Sheets
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Patent number: 4598036Abstract: A print-out composition containing a leuco dye and a photooxidizing agent is described, said print-out composition containing at least one carbazomethane compound represented by formula (I) as the leuco dye ##STR1## wherein Y represents an amino group-substituted phenyl group represented by formula (Ia) ##STR2## or an indolyl group represented by formula (Ib) ##STR3## wherein X.sub.1 and X.sub.2 each represents a hydrogen atom, an unsubstituted alkyl group, or an alkyl group substituted by a halogen atom, a hydroxy group, a cyano group, or a lower alkoxy group, said alkyl group having up to 12 carbon atoms, a cycloalkyl group, a phenyl group, a benzyl group, or a phenyl or benzyl group substituted by a halogen atom, a lower alkyl group, or a lower alkoxy group, or said X.sub.1 and X.sub.2 together may form a 5-membered or 6-membered heterocyclic group together with the nitrogen atom bonded thereto; X.sub.Type: GrantFiled: September 10, 1984Date of Patent: July 1, 1986Assignee: Fuji Photo Film Co., Ltd.Inventors: Masayuki Iwasaki, Minoru Maeda, Fumiaki Shinozaki, Sadao Ishige
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Patent number: 4552830Abstract: Compositions containing a polymerizable, curable or crosslinkable component, a photoinitiator, a colorformer capable of changing color upon contact with a suitable activator and a latent activator containing an organic halide will become insoluble and change color under the influence of actinic radiation. The organic halide is a carbonylic compound such as an aliphatic or cycloaliphatic ketone or an ester or amide of a dicarboxylic acid. The compositions are useful to make resists used in the electronics industry to manufacture printed circuits.Type: GrantFiled: November 25, 1983Date of Patent: November 12, 1985Assignee: Dynachem CorporationInventors: Edward J. Reardon, Melvin A. Lipson
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Patent number: 4465761Abstract: An image-forming photosensitive composition comprises:(a) an organohalogen compound capable of forming a free radical by the irradiation with light,(b) a substantially colorless dye which colors when it is contacted with an acidic substance,(c) an aromatic amine and/or conjugated nitrogen-containing heterocyclic compound,(d) a binder, and(e) an aliphatic amine and/or alicyclic amine.Type: GrantFiled: February 23, 1982Date of Patent: August 14, 1984Assignees: Oriental Photo Industries Co., Ltd., Hodogaya Chemical Co., Ltd.Inventors: Yukio Takegawa, Akira Tukada, Susumu Suzuka, Nobuyoshi Endo
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Patent number: 4458000Abstract: Disclosed is a light-sensitive mixture comprising (a) a 1,2-quinonediazide or a mixture of (a.sup.1) a compound forming an acid on exposure and (a.sup.2) a compound having at least one C--O--C bond cleavable by acid; (b) a water-insoluble binder soluble in aqueous-alkaline solutions; (c) a photolytically cleavable organic halogen compound of one of the formulae ##STR1## in which R.sup.1 denotes an aromatic radical bonded directly or via a conjugated chain, and X denotes a halogen atom; and (d) an azo dyestuff containing at least one nitro group in the molecule. Also disclosed are light-sensitive copying materials produced from these mixtures.Type: GrantFiled: September 28, 1982Date of Patent: July 3, 1984Assignee: Hoechst AktiengesellschaftInventor: Paul Stahlhofen
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Patent number: 4425424Abstract: There is disclosed a radiation-sensitive composition comprising a leuco dye and a sulfonyloxy-N photooxidant that converts the leuco dye to a dye having a color different from that of its leuco form, when exposed to activating radiation. Improved print-out densities are obtained using this composition in image-forming methods.Type: GrantFiled: June 21, 1982Date of Patent: January 10, 1984Assignee: Eastman Kodak CompanyInventors: Henry W. Altland, Raymond W. Ryan, Jr., Phillip P. Senise, Jr., Michael J. Lindstrom
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Patent number: 4420553Abstract: Photographic material comprising a supported or self-supporting binder layer incorporating a photoradical precursor compound in operative relationship with an image-forming precursor compound which is capable of taking part in image formation by reaction with the photoradicals formed by photoexposing said photoradical precursor, wherein the image-forming compound is a reducing compound containing Zerewitinoff active hydrogen for forming a print-out image or an ethylenically unsaturated compound capable of free-radical addition polymerization, and the photoradical precursor compound is a di- or tri(2,3-aryl substituted indolyl) compound free of Zerewitinoff active hydrogen.Type: GrantFiled: May 10, 1982Date of Patent: December 13, 1983Assignee: AGFA-GEVAERT N.V.Inventors: Jan F. Van Besauw, Luc H. Leenders, Dirk M. D'hont, Hendrik E. Kokelenberg, Rafael P. Samijn
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Patent number: 4411978Abstract: A photosensitive recording material which includes in a supported layer a mixture of photosensitive substances in admixture with one or more polymers that are soluble in an alkaline aqueous liquid, characterized in that such mixture of photosensitive substances essentially consists of:(A) at least one photosensitive nitrone of the formula: ##STR1## in which: R is an aromatic hydrocarbon group including a substituted aromatic hydrocarbon group,R.sup.Type: GrantFiled: March 13, 1978Date of Patent: October 25, 1983Assignee: AGFA-Gevaert N.V.Inventors: Urbain L. Laridon, Hendrik E. Kokelenberg, Rafael P. Samijn
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Patent number: 4394433Abstract: A novel light sensitive, heat developable imaging system incorporating a diazonium salt and a leuco dye in a binder is disclosed.Type: GrantFiled: July 23, 1981Date of Patent: July 19, 1983Assignee: Minnesota Mining and Manufacturing CompanyInventor: Kenneth G. Gatzke
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Patent number: 4379835Abstract: A thermographic imaging system comprising a single layer and capable of providing a stable dark to black image upon localized heating is disclosed. The single layer comprises a polymeric binder, a combination of at least two leuco dyes, and a nitrate salt.Type: GrantFiled: December 22, 1980Date of Patent: April 12, 1983Assignee: Minnesota Mining and Manufacturing CompanyInventors: Robert D. Lowrey, Howard D. Nelson, George Van Dyke Tiers
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Patent number: 4373017Abstract: A photosensitive material having a photosensitive layer provided on a support which photosensitive layer comprises a photosensitive compound which forms a color dye directly under irradiation of ultraviolet rays, the compound being represented by the formula [i]: ##STR1## wherein [COUP] represent a 4-equivalent yellow, magenta or cyan coupler from which a hydrogen is removed at a coupling position thereof, B is a hydroxy group or ##STR2## wherein R.sup.6 and R.sup.7 are individually an alkyl group or they may form a 1-piperidino, 1-piperazino, 1-pyrolidino or 4-morpholino group together with each other,R.sup.1 is an alkyl, aryl, alkylamino or arylamino group, and R.sup.2, R.sup.3, R.sup.4 and R.sup.5 individually are a hydrogen or halogen atom or aliphatic or aromatic group, or R.sup.2 and R.sup.3 may be fused to form a naphthalene ring.Type: GrantFiled: March 5, 1981Date of Patent: February 8, 1983Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Toyoaki Masukawa, Wataru Ishikawa, Kenichiro Okaniwa, Kiyoshi Yamashita
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Patent number: 4371606Abstract: This invention relates to a novel 2-(halogenomethyl-phenyl)-4-halogeno-oxazole derivative; to a radiation-sensitive composition which, as the radiation-sensitive compound, contains a 2-halogenomethyl-phenyl)-4-halogeno-oxazole derivative; and to a process for the preparation of the novel 2-(halogenomethyl-phenyl)-4-halogeno-oxazole derivatives.Type: GrantFiled: June 9, 1981Date of Patent: February 1, 1983Assignee: Hoechst AktiengesellschaftInventor: Reinhard Donges
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Patent number: 4371607Abstract: This invention relates to a novel 4-halogeno-5-(halogenomethyl-phenyl)-oxazole derivative; to a radiation-sensitive composition which, as the radiation-sensitive compound, contains a 4-halogeno-5-(halogenomethyl-phenyl)-oxazole derivative; and to a process for the preparation of the novel 4-halogeno-5-(halogenomethyl-phenyl)-oxazole derivatives.Type: GrantFiled: June 9, 1981Date of Patent: February 1, 1983Assignee: Hoechst AktiengesellschaftInventor: Reinhard Donges
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Patent number: 4308341Abstract: There are disclosed an imaging composition, element and method featuring an aromatic dialdehyde that reacts with an exposure-generated amine to form a dye. The photographic speed of the reaction is improved by incorporating into the composition an imide capable of providing an ##STR1## moiety when heated.Type: GrantFiled: August 8, 1980Date of Patent: December 29, 1981Assignee: Eastman Kodak CompanyInventor: Thap DoMinh
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Patent number: 4306014Abstract: A photo-sensitive and heat-sensitive composition consisting essentially of a leuco-pigment; a hydrogen donator; a photo-reductant which, when exposed to a visible light, produces a reducing agent by the action of said hydrogen donator coexisting therewith; a photooxidant which, when exposed to an ultraviolet ray, causes said leuco-pigment coexisting therewith to generate color and simultaneously, when reacted with said reducing agent, is deprived of its own oxidizing ability; and a cobalt complex which reacts with the reducing agent in amplifying manner to thereby suppress the reaction of a color-forming system, and a recording element using the same.Type: GrantFiled: March 31, 1980Date of Patent: December 15, 1981Assignee: Ricoh Co., Ltd.Inventors: Makoto Kunikane, Akiyoshi Yasumori, Kiyoshi Taniguchi, Tetu Yamamuro
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Patent number: 4298678Abstract: A photosensitive composition comprising a photooxidant, leuco dye and a substituted hydroxylamine compound of the formula R.sub.1 R.sub.2 NOH wherein R.sub.1 and R.sub.2, e.g., are alkyl, cyclic alkyl, aryl, aralkyl, alkaryl and R.sub.1 and R.sub.2 taken together form a heterocyclic ring of 5 to 7 carbon atoms. Optionally monomers and polymeric binders can be present. The compositions are useful for photoimaging and in solvent and aqueous developable resist-forming films.Type: GrantFiled: August 14, 1980Date of Patent: November 3, 1981Assignee: E. I. Du Pont de Nemours and CompanyInventor: Mark R. McKeever
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Patent number: 4284704Abstract: Imaging means, such as a tetrazolium salt, capable of reduction to form a visible image is present in a radiation-sensitive layer in combination with a photoreductant incorporating one or more labile hydrogen atoms and capable of producing a reducing agent precursor in radiation-struck areas of the layer. An image is produced in the layer by processing the layer after imagewise exposure to actinic radiation.Type: GrantFiled: September 29, 1978Date of Patent: August 18, 1981Assignee: Eastman Kodak CompanyInventors: James C. Fleming, Joseph W. Manthey, Ralph T. Brongo
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Patent number: 4279982Abstract: A photosensitive composition containing the 2-trihalomethyl-5-aryl-1,3,4-oxadiazole compound represented by the following general formula: ##STR1## wherein X represents a chlorine atom or a bromine atom and A represents a phenyl group, a naphthyl group or a phenyl or naphthyl group substituted by a halogen atom, an alkyl group, an alkoxy group, a nitro group, a cyano group or a methylenedioxy group.Type: GrantFiled: December 6, 1979Date of Patent: July 21, 1981Assignee: Fuji Photo Film Co., Ltd.Inventors: Masayuki Iwasaki, Akira Nagashima, Shigeru Sato
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Patent number: 4271251Abstract: A stabilized photosensitive composition comprising a leuco dye, a photooxidizing agent, and further a 2,4-dihydroxybenzaldoxime which is suitable for use in lithography, photoresists, etc., for obtaining visible contrast between the exposed and unexposed areas.Type: GrantFiled: October 19, 1979Date of Patent: June 2, 1981Assignee: Fuji Photo Film Co., Ltd.Inventors: Yoshimasa Aotani, Hiroshi Misu, Akira Nagashima
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Patent number: 4263395Abstract: A recording method for directly forming a visible image, which method comprises exposing a recording material information-wise to ultra-violet radiation having a wave-length in the range of 200 nm to 400 nm, with a radiation intensity of at least 5.times.10.sup.11 erg/sq.cm.s so that the recording material receives a radiation energy dose of at least 1.times.10.sup.7 erg/sq.cm, the said recording material containing in a layer in admixture with an organic binder medium:(A) at least one dye precursor compound, which is a spiropyran compound or a compound corresponding to one of the general formulae ##STR1## wherein: R represents hydrogen, a lower alkyl (C.sub.1 -C.sub.3) group, a lower alkyl group, a phenyl group or phenyloxy,R.sup.1 represents an organic group,Z.sup.1 represents the necessary atoms to close a homocyclic ring or ring system,Z.sup.2 represents the necessary atoms to close a homocyclic ring or ring system,R.sup.2 represents a lower alkyl (C.sub.1 -C.sub.Type: GrantFiled: April 18, 1979Date of Patent: April 21, 1981Assignee: AGFA-GEVAERT N.V.Inventors: Gerard A. Delzenne, Hendrik E. Kokelenberg
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Patent number: 4258123Abstract: A photosensitive resin composition comprising:(a) a photopolymerizable or photocrosslinkable ethylenically unsaturated compound;(b) a compound of the formula (I): ##STR1## wherein X.sub.1, X.sub.2 and X.sub.3 may be the same or different and each represents a hydrogen atom, a chlorine atom or a bromine atom and at least one of X.sub.1, X.sub.2 and X.sub.3 representing a chlorine atom or a bromine atom; Y represents a --CX.sub.1 X.sub.2 X.sub.3 group where X.sub.1, X.sub.2 and X.sub.3 are as defined above, --NH.sub.2, --NHR', --NR'.sub.2, --SR', --OR' or --R' wherein R' is an alkyl group or an aryl group; R is an alkyl group, an aryl group or an alkenyl group, and may be substituted;(c) a compound of the formula (II): ##STR2## where Z represents the non-metallic atoms necessary to complete a nitrogen-containing heterocyclic ring; R.sub.1 is an alkyl group or a substituted alkyl group; R.sub.2 is an alkyl group, an aryl group or a substituted aryl group; and(d) a dye precursor.Type: GrantFiled: August 29, 1979Date of Patent: March 24, 1981Assignee: Fuji Photo Film Co., Ltd.Inventors: Akira Nagashima, Shigeru Sato
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Patent number: 4245027Abstract: A light-sensitive image recording material comprising, as a self-supporting film or in one or more layers on a support, at least(a) a heat sensitive coloring element comprising at least one polyvinyl pyridine and at least one polyvinylidene halide, and(b) a light sensitizing element comprising at least one of(1) a compound which, on exposure to actinic radiation, is capable of complexing the polyvinyl pyridine of element (a) or is capable of forming a quaternary salt with the polyvinyl pyridine of element (a), or(2) a compound which, on exposure to actinic radiation, is capable of releasing a precursor which is capable of complexing the polyvinyl pyridine of element (a) or is capable of forming a quaternary salt with the polyvinyl pyridine of element (a) under heating,and a dry process for recording a light image comprising(1) imagewise exposing to actinic radiation the light-sensitive image recording material described above, and(2) uniformly heating the imagewise exposed light-sensitive image recording mateType: GrantFiled: July 11, 1978Date of Patent: January 13, 1981Assignee: Fuji Photo Film Co., Ltd.Inventors: Keiji Takeda, Masayoshi Nagata, Kenji Matsumoto
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Patent number: 4232106Abstract: Photosensitive compositions containing 2-halomethyl-5-vinyl-1,3,4-oxadiazole compounds represented by the following general formula (I): ##STR1## wherein W represents a substituted or unsubstituted aryl group, X represents a hydrogen atom, an alkyl group or an aryl group, Y represents a fluorine atom, a chlorine atom or a bromine atom, and n represents an integer of 1 to 3.Type: GrantFiled: November 16, 1978Date of Patent: November 4, 1980Assignee: Fuji Photo Film Co., Ltd.Inventors: Masayuki Iwasaki, Shigeru Sato, Yasuo Inoue, Akira Nagashima
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Patent number: 4224225Abstract: 2-Arylnaphtho[1,8-bc]furan-5-ones represented by general formula (I): ##STR1## wherein G represents a substituted phenyl group, an unsubstituted or substituted 1-naphthyl group and an unsubstituted or substituted 2-naphthyl group, with the substituents being selected from the group consisting of a straight chain or branched chain alkyl group having 1 to 5 carbon atoms, a straight chain or branched chain alkoxy group having 1 to 3 carbon atoms and a halogen atom; are disclosed as well as photopolymerizable compositions containing at least one of the above compounds as a photopolymerization initiator for addition polymerizable ethylenically unsaturated compounds.Type: GrantFiled: October 20, 1978Date of Patent: September 23, 1980Assignee: Fuji Photo Film Co., Ltd.Inventors: Yasuhiro Noguchi, Syunichi Kondo, Akihiro Matsufuji, Hisatake Ono, Toshio Uchida