Cellulosic Patents (Class 430/911)
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Patent number: 7622247Abstract: Mixtures of an alkyl vinyl ether/maleic anhydride copolymer or an alkylethylene/maleic anhydride copolymer with cellulose acetate provide protective overcoats for thermally developable materials. These protective overcoats exhibit good adhesion to the emulsion layer, are physically hard, and have good optical clarity while maintaining the sensitometric properties of the materials.Type: GrantFiled: January 14, 2008Date of Patent: November 24, 2009Assignee: Carestream Health, Inc.Inventors: William Donald Ramsden, Chaofeng Zou, Doreen Catherine Lynch, Stacy Marie Ulrich, Sharon Mary Simpson
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Patent number: 7507525Abstract: A lithographic printing plate precursor having a photosensitive layer containing (A) at least one saccharide selected from the group consisting of an oligosaccharide and a polysaccharide, (B) a binder polymer, (C) a compound having an addition polymerizable ethylenic unsaturated bond, and (D) a polymerization initiator, or a lithographic printing plate precursor having an undercoat layer comprising (A) at least one saccharide selected from the group consisting of an oligosaccharide and a polysaccharide, and a photosensitive layer containing (B) a binder polymer, (C) a compound having an addition polymerizable ethylenic unsaturated bond, and (D) a polymerization initiator.Type: GrantFiled: May 3, 2006Date of Patent: March 24, 2009Assignee: FUJIFILM CorporationInventor: Atsushi Sugasaki
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Patent number: 7494761Abstract: A photoresist film is formed on an object layer of a semiconductor device by coating the object layer with a photoresist composition including about 7 percent to about 14 percent by weight of a cyclodextrin derivative, about 0.1 percent to about 0.5 percent by weight of a photoacid generator, and a remainder of an organic solvent. The cyclodextrin derivative includes a ?-cyclodextrin moiety and at least one alkyl carbonate group.Type: GrantFiled: September 11, 2007Date of Patent: February 24, 2009Assignee: Samsung Electronics Co., Ltd.Inventors: Hyo-Jin Yun, Young-Gil Kwon, Young-Ho Kim, Hong Lee, Do-Young Kim
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Patent number: 7129022Abstract: This invention relates to a photo-polymerization type photosensitive electrode paste composition for a plasma display panel that is capable of preventing a bubble from occurring on an electrode surface during an electrode paste printing process and a damage of an electrode pattern caused by adhesive strength reduction, and a method of fabricating the electrode using the same. A photo-polymerization type photo-sensitive electrode paste composition for a PDP according to the present invention includes a binder polymer for increasing viscosity; at least one of a multi-functional monomer and a multi-functional oligomer that are combined in the shape of chain in reaction to a radical; metal powder; a frit glass for gluing the metal powder; and a photo-initiator and solvent for generating the radical in reaction to a light.Type: GrantFiled: November 27, 2002Date of Patent: October 31, 2006Assignee: LG Electronics Inc.Inventors: Sang Tae Kim, Seung Tae Park, Lee Soon Park, Jong Woo Park
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Patent number: 6808865Abstract: Present invention provides an aqueous emulsion type photosensitive resin composition which forms a cured film significantly superior in water and solvent resistances in comparison with the conventional aqueous emulsion type photosensitive resin compositions. This photosensitive resin composition contains (A) an emulsion of a photosensitive water-insoluble polymer, the emulsion being obtained by reacting (i) an aqueous polymer emulsion whose main ingredient is a water-insoluble polymer and which contains a polymer having a hydroxyl group with (ii) an N-alkylol(meth)acrylamide, (B) a compound having a photoreactive ethylenically unsaturated group, and (C) a photopolymerization initiator.Type: GrantFiled: November 19, 2001Date of Patent: October 26, 2004Assignee: Goo Chemical Co., Ltd.Inventors: Toshio Morigaki, Masatami Matsumoto
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Publication number: 20040157947Abstract: Polymeric material, containing a latent acid which can be converted to an acid by irradiation by a laser and optionally further ingredients.Type: ApplicationFiled: November 12, 2003Publication date: August 12, 2004Inventor: Michael Heneghan
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Publication number: 20040152008Abstract: A method of colouring a polymeric material containing a) a latent acid, b) a colour former and c) optionally further ingredients by irradiation with UV-light.Type: ApplicationFiled: December 4, 2003Publication date: August 5, 2004Inventors: Michael Heneghan, James Philip Taylor
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Patent number: 6764807Abstract: A planographic printing member precursor comprises a first component, for example a hydroxy group containing polymer, and a second component which may be a siloxane or a compound of general formula (I), wherein M represents a silicon or a titanium atom and each of R1, R2, R3 and R4 is independently selected from hydrogen or halogen atoms; a hydroxy group; an optionally substituted alkyl, alkenyl or alkynyl group; an optionally substituted alkoxy group; or an optionally substituted saturated or unsaturated cyclic or heterocyclic group. On exposure, the second component reacts with the first component to define an oleophobic/hydrophilic material in exposed areas and in non-exposed areas the second component is removed, on processing of the precursor.Type: GrantFiled: September 5, 2001Date of Patent: July 20, 2004Assignee: Kodak Polychrome Graphics LLCInventors: Kevin Barry Ray, Mark John Spowage, Christopher David McCullough
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Patent number: 6749994Abstract: A photosensitive insulating paste composition comprising: an organic component comprising the components of (A) a water-soluble cellulose derivative, (B) a photopolymerizable monomer, (C) an acrylic resin having a hydroxyl group, and (D) a photopolymerization initiator; and an inorganic powder.Type: GrantFiled: April 30, 2002Date of Patent: June 15, 2004Assignee: Tokyo Ohka Kogyo Co., Ltd.Inventors: Kiminori Oshio, Tomoyuki Inoue, Hitoshi Setsuda, Hiroyuki Obiya
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Publication number: 20040058271Abstract: The pattern formation material of this invention is composed of a chemically amplified resist material. The chemically amplified resist material includes a polymer whose solubility in a developer is changed owing to a function of an acid; an acid generator that generates an acid through irradiation with an energy beam; and a compound that absorbs outgassing induced from the polymer or the acid generator.Type: ApplicationFiled: August 15, 2003Publication date: March 25, 2004Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Masayuki Endo, Masaru Sasago
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Publication number: 20030215747Abstract: This invention relates to a photo-polymerization type photosensitive electrode paste composition for a plasma display panel that is capable of preventing a bubble from occurring on an electrode surface during an electrode paste printing process and a damage of an electrode pattern caused by adhesive strength reduction, and a method of fabricating the electrode using the same.Type: ApplicationFiled: November 27, 2002Publication date: November 20, 2003Applicant: LG Electronics Inc.Inventors: Sang Tae Kim, Seung Tae Park, Lee Soon Park, Jong Woo Park
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Publication number: 20030118939Abstract: The present invention provides an IR-sensitive composition, which includes: a polymeric binder; and a free radical polymerizable system consisting of: at least one component selected from unsaturated free radical polymerizable monomers, oligomers which are free radical polymerizable and polymers containing C═C bonds in the backbone and/or in the side chain groups; and an initiator system, which includes: (a) at least one compound capable of absorbing IR radiation; (b) at least one compound capable of producing radicals; and (c) at least one carboxylic co-initiator, provided that the total acid number of the polymeric binder is 70 mg KOH/g or less. The present invention further provides a printing plate precursor, a process for preparing the printing plate and a method of producing an image.Type: ApplicationFiled: November 9, 2001Publication date: June 26, 2003Applicant: KODAK POLYCHROME GRAPHICS, L.L.C.Inventors: Heidi Munnelly, Paul West
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Patent number: 6521390Abstract: Photosensitive printing element for preparing flexographic printing plates via computer-to-plate technology with a support, a photopolymerizable layer and an IR-ablatable layer substantially opaque to actinic radiation which comprises at least one heat-combustible polymeric binder, at least one IR-absorbing material and at least one aliphatic diester, and a process for making a flexographic printing plate using such an element.Type: GrantFiled: July 11, 2000Date of Patent: February 18, 2003Assignees: BASF Drucksysteme GmbH, Agfa Gevaert N.V.Inventors: Alfred Leinenbach, Sabine Philipp, Eddy Daems, Hieronymus Andriessen, Luc Leenders
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Publication number: 20020086235Abstract: A planographic printing member precursor comprises a first component, for example a hydroxy group containing polymer, and a second component which may be a siloxane or a compound of general formula (I), wherein M represents a silicon or a titanium atom and each of R1, R2, R3 and R4 is independently selected from hydrogen or halogen atoms; a hydroxy group; an optionally substituted alkyl, alkenyl or alkynyl group; an optionally substituted alkoxy group; or an optionally substituted saturated or unsaturated cyclic or heterocyclic group. On exposure, the second component reacts with the first component to define an oleophobic/hydrophilic material in exposed areas and in non-exposed areas the second component is removed, on processing of the precursor.Type: ApplicationFiled: September 5, 2001Publication date: July 4, 2002Inventors: Kevin Barry Ray, Mark John Spowage, Christopher David McCullough
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Patent number: 6399271Abstract: A planographic printing member precursor comprises a first component, for example a hydroxy group containing polymer, and a second component which may be a siloxane or a compound of general formula (I): wherein M represents a silicon or a titanium atom and each of R1, R2, R3 and R4 is independently selected from hydrogen or halogen atoms; a hydroxy group, an optionally substituted alkyl, alkenyl or alkynyl group; an optionally substituted alkoxy group; or an optionally substituted saturated or unsaturated cyclic or heterocyclic group. On exposure, the second component reacts with the first component to define an oleophobic/hydrophilic material in exposed areas and in non-exposed areas the second component is removed, on processing of the precursor.Type: GrantFiled: March 2, 2000Date of Patent: June 4, 2002Assignee: Kodak Polychrome Graphics LLCInventors: Kevin Barry Ray, Mark John Spowage, Christopher David McCullough
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Patent number: 6322947Abstract: A photosensitive composition for sandblasting and a photosensitive film laminate having a photosensitive layer comprising the photosensitive composition are disclosed, the photosensitive composition comprising (A) a photopolymerizable urethane (meth)acrylate oligomer having at least two acryloyl groups and/or methacryloyl groups and a structural unit represented by formula: (B) an alkali-soluble compound, and (C) a photopolymerization initiator.Type: GrantFiled: August 13, 1999Date of Patent: November 27, 2001Assignee: Tokyo Ohka Kogyo Co., Ltd.Inventors: Ryuma Mizusawa, Shinkichi Asahi, Syunzi Nakazato, Hiroyuki Obiya
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Publication number: 20010010892Abstract: A printing plate element is disclosed, comprising a substrate and a component layer containing a first material which is water-insoluble or capable of varying from being water-soluble to being water-insoluble at a prescribed temperature of not less than 60° C. and a second material which is water-soluble and has a melting point of 60 to 300° C. A method of preparing a printing plate is also disclosed, comprising imagewise exposure of the printing plate element and removing an unexposed area of the printing plate element with aqueous solution.Type: ApplicationFiled: December 8, 2000Publication date: August 2, 2001Inventor: Takahiro Mori
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Patent number: 6200733Abstract: A photosensitive composition for sandblasting and a photosensitive film having a photosensitive layer comprising the photosensitive composition are disclosed, the photosensitive composition comprising a photopolymerizable urethane (meth)acrylate oligomer having at least two acryloyl groups and/or methacryloyl groups, a photopolymerization initiator, and at least one cellulose derivative selected from the group consisting of hydroxypropyl cellulose, ethylhydroxyethyl cellulose, hydroxypropylmethyl cellulose phthalate, and hydroxypropylmethyl cellulose acetate phthalate. The composition exhibits excellent adhesion to a substrate, high sensitivity, and high resistance to sandblasting.Type: GrantFiled: October 14, 1998Date of Patent: March 13, 2001Assignee: Tokyo Ohka Kogyo Co., Ltd.Inventors: Ryuma Mizusawa, Syunji Nakazato, Hiroyuki Obiya
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Patent number: 6040113Abstract: Heat-sensitive imaging element for making positive working printing plates according to the present invention there is provided a heat-sensitive imaging element for making positive working lithographic printing plates comprising on a lithographic base a layer comprising a polymer, soluble in an aqueous alkaline solution and an IR-radiation sensitive top layer. Upon image-wise exposure the capacity of the aqueous alkaline solution to penetrate and/or solubilize the top layer is changed. Image-wise exposure can be performed with an infrared laser with a short as well as with a long pixel well time.The obtained positive working printing plates have excellent printing properties and an improved infrared sensitivity.Type: GrantFiled: February 18, 1998Date of Patent: March 21, 2000Assignee: AGFA-Gevaert, N.V.Inventors: Marc Van Damme, Joan Vermeersch
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Patent number: 6030712Abstract: A printing plate material producing prints with inhibited background staining is provided by formation of a photosensitive layer comprising nitrocellulose, a black coloring agent, e.g. carbon black, and an organic binder and having (1) a surface roughness of not greater than Rmax. 2.0 .mu.m or (2) a surface tension equivalent to a wettability index of not greater than 36 dyn/cm on a support. The nitrocellulose has a nitrogen content of 11 to 12.5% and a solution viscosity of about 1 to 1/8 second. The organic binder includes polyester resins such as solvent-soluble, noncrystal-line, linear, oil-free aromatic polyesters. Based on 100 parts by weight of the organic binder, the amount of nitrocellulose is about 5 to 300 parts by weight and that of the black coloring agent is about 0.5 to 50 parts by weight. The photosensitive layer may contain a crosslinking agent, e.g. melamine resin, and/or a water repellent, e.g. a silicone compound or a fluorine-containing compound.Type: GrantFiled: April 12, 1995Date of Patent: February 29, 2000Assignee: Daicel Chemical Industries, Ltd.Inventors: Kazuo Notsu, Yoshinori Funaki
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Patent number: 5976735Abstract: There is described a lithographic plate which comprises a base coated with a photopolymerisable composition which comprises a polymeric binder, at least one free-radically polymerisable ethylenically unsaturated compound and as the photoinitiator combination a metallocene compound, N-phenyl glycine or a substituted N-phenyl glycine or an N-phenyl glycine derivative together with a third component which is a substance which helps in the reaction initiation but also increases the sensitivity of the photopolymerisable composition to a desired region of the spectrum.Type: GrantFiled: March 21, 1996Date of Patent: November 2, 1999Assignee: Kodak Polychrome Graphics LLCInventors: Alan Stanley Victor Monk, Peter Andrew Reath Bennett, Christopher David McCullogh, Geoffrey Horne
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Patent number: 5916732Abstract: A photosensitive resin composition for printing plates including the following components A, B-1, C and D, or a photosensitive resin composition for printing plates, including the following components A, B-2, C and D:A: a hydrophilic polymerB-1: a rubber having a molecular weight of 40,000 or moreB-2: a dynamically-vulcanized rubberC: a photo-polymerizing unsaturated compound having ethylenic double bond(s) in the moleculeD: a photo-polymerization initiator.The photosensitive resin compositions for printing plates of the invention have high-degree image reproducibility and flexibility suitable for flexography and additionally have good water developability with satisfactory compatibility with aqueous ink. Therefore, using the compositions, flexographic printing plates with excellent printing durability in flexography using aqueous ink or other flexographic printing inks can be produced. Further, using these, water-developable plates for flexography with good rubber elasticity can be produced.Type: GrantFiled: January 24, 1996Date of Patent: June 29, 1999Assignee: Toray Industries, inc.Inventors: Katsutoshi Sasashita, Shinji Tanaka, Shigetora Kashio
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Patent number: 5869220Abstract: Highly versatile stable photoresist emulsions can be prepared using low levels of neutralization while minimizing the use of surfactants and associative thickeners. High solids, low viscosity waterborne photoresist emulsion compositions are prepared by mixing and comminuting a partially neutralized acid functional latex polymer resin with photopolymerizable monomers and photoinitiators under conditions sufficient to produce a stable emulsion.Type: GrantFiled: June 6, 1997Date of Patent: February 9, 1999Assignee: MacDermid Acumen, Inc.Inventors: John Scott Hallock, Hiroshi Samukawa
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Patent number: 5851731Abstract: A water processable photopolymeric composition for use in the manufacture of flexographic photopolymer printing plates is disclosed. Preferably, the flexomer blend includes a flexomer having an affinity for water combined with a hydrophilic crosslinking agent, a nonhydrophilic crosslinking agent, a swell enhancing filler, a hydrophilic plasticizer, a compatibilizer and a surfactant. The compatibilizer aids the blending of the hydrophilic components with the flexomer blend.Type: GrantFiled: September 9, 1996Date of Patent: December 22, 1998Assignee: M. A. Hanna CompanyInventors: Carl David McAfee, Piseth Lov, David Thomas Hughes, Michael Wayne Chase
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Patent number: 5756261Abstract: Disclosed is a photosensitive resin composition suitable as a resist material against sandblasting for pattern-wise engraving of the surface of a body after photo-lithographic patterning, which comprises: (a) a urethane compound having a (meth)acrylate group at the molecular end, which is obtained from a polyether or polyester compound having a hydroxy group at the molecular chain end, a diisocyanate compound and a (meth)acrylate compound having a hydroxy group; (b) an alkali-soluble polymeric compound having an acid value in the range from 50 to 250 mg KOH/g; and (c) a photopolymerization initiator.Type: GrantFiled: April 26, 1996Date of Patent: May 26, 1998Assignees: Matsushita Electronics Corporation, Tokyo Ohka Kogyo Co., Ltd.Inventors: Hiroshi Takehana, Tetsuo Yamamoto, Hiroyuki Obiya, Ryuma Mizusawa
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Patent number: 5409801Abstract: A method for improving the resolution of an electron resist pattern on a substrate coated with a polymeric electron resist film is disclosed which provides an external coating layer of dried polymer selected from the group consisting of water-soluble polymers and poly(m-phenylene isophthalamide), or of a mixture consisting essentially of said dried polymer and hexavalent tungsten compounds wherein the weight ratio of the tungsten compounds to polymer is up to about 1:1. Also disclosed are substrates coated with a polymeric resist film wherein the resist film consists essentially of such external layers, or wherein an external coating layer of said polymer-tungsten compound mixture is provided.Type: GrantFiled: April 15, 1994Date of Patent: April 25, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventors: Robert V. Kasowski, Sau L. Tang
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Patent number: 5273862Abstract: A photopolymerizable recording material is diclosed comprising a base material, a photopolymerizable layer and a cover layer which comprises a water-soluble polymer which is substantially impermeable to atmospheric oxygen, and a polymer which binds atmospheric oxygen and is virtually completely soluble in water at 20.degree. C. The material displays reduced sensitivity to atmospheric oxygen, even on prolonged storage and at elevated ambient temperatures and elevated atmospheric humidity.Type: GrantFiled: July 17, 1992Date of Patent: December 28, 1993Assignee: Hoechst AktiengesellschaftInventors: Rudolf Zertani, Dieter Mohr
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Patent number: 5098803Abstract: Solid photopolymerizable compositions and photosensitive elements are provided that are useful in preparing optical elements, and especially holograms. The compositions contains a polymeric binder, a liquid ethylenically unsaturated monomer, and a photoinitiator system. Typical compositions have a refractive index modulation of at least 0.005 when measured per the specified test.Type: GrantFiled: February 14, 1990Date of Patent: March 24, 1992Assignee: E. I. Du Pont de Nemours and CompanyInventors: Bruce M. Monroe, William K. Smothers
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Patent number: 5057394Abstract: Method of forming a positive-positive type image is disclosed, which is characterized in that a photosensitive layer is formed on a substrate using a composition comprising water-soluble photo-crosslinking agent, water-soluble resin and synthetic resin emulsion and further coloring agent, if necessary, said photosensitive layer is exposed to active rays through manuscript, then this is immersed into warm water of 30.degree. to 60.degree. C. for not less than 3 seconds to allow the exposed area to swell and soften sufficiently with warm water and simultaneously to allow almost all water-soluble photo-crosslinking agent in the nonexposed area to dissolve out into warm water, and successively the swollen and softened exposed area is rubbed out to form an image having no coloring originating from water-soluble photo-crosslinking agent without using the development chemicals except water.Type: GrantFiled: March 14, 1989Date of Patent: October 15, 1991Assignee: Sanyo-Kokusaku Pulp Co., Ltd.Inventors: Norio Yabe, Hideaki Sasaki, Kuniaki Monden
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Patent number: 4994347Abstract: Solid storage stable photopolymerizable compositions are provided that are useful in preparing optical elements, and especially holograms. The composition contains a polymeric binder, N-vinyl carbazole and a photoinitiator system that has a hydrogen donor component.Type: GrantFiled: December 23, 1988Date of Patent: February 19, 1991Assignee: E. I. du Pont de Nemours and CompanyInventor: William K. Smothers
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Patent number: 4855212Abstract: Disclosed are improved photopolymerizable compositions which can be developed using aqueous media. The improved compositions contain cellulosic ethers which impart an unexpected improvement in tent strength and optionally contain a plasticizer and a photochemically polymerizable carboxylic acid monomer or both which aid adhesion and stripping.Type: GrantFiled: January 25, 1988Date of Patent: August 8, 1989Assignee: Hercules IncorporatedInventors: Marilyn Tate, Daniel F. Varnell
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Patent number: 4797353Abstract: A method for processing a silver halide light-sensitive material is disclosed, comprising a support having thereon at least one silver halide emulsion layer with an automatic developing machine which comprises developing an imagewise exposed silver halide light-sensitive material, wherein an amount of organic substances remaining in at least one of the emulsion layer or other hydrophilic colloid layers comprising a surface protective layer after said processing with said automatic developing machine, is not more than about 90 wt % of the weight of said organic substances prior to said processing.Type: GrantFiled: September 10, 1987Date of Patent: January 10, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Sumito Yamada, Hiroshi Kawasaki, Masaki Satake
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Patent number: 4610952Abstract: Water soluble blends are provided of alkanolacrylamide, water soluble hydroxyl containing film forming organic oligomer and an effective amount of an onium salt photoinitiator. These photocurable compositions can be used as photoresists.Type: GrantFiled: April 22, 1985Date of Patent: September 9, 1986Assignee: General Electric CompanyInventor: James V. Crivello
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Patent number: 4582776Abstract: An information recording disc comprising a generally circular substrate having a polished major surface, a light-reflective coating formed on the polished major surface of the substrate, and a light-absorptive coating formed on the surface of the light-reflective coating and formed with information tracks each consisting of a succession of spaced pits in the light-absorptive coating, the light-absorptive coating being composed of a mixture of cellulose nitrate and a dye sensitizer exhibiting a noticeable light absorptivity in response to light with a predetermined wavelength, the cellulose nitrate being prepared from a starting cellulose containing at least about 97% of alpha-cellulose. If desired, the light-reflective coating may be dispensed with so that the light-absorptive information recording coating is formed directly on the polished surface of the substrate.Type: GrantFiled: September 28, 1982Date of Patent: April 15, 1986Assignee: Pioneer Electronic CorporationInventors: Fumio Matsui, Manabu Sugano
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Patent number: 4537854Abstract: Water soluble blends are provided of alkanolacrylamide, water soluble hydroxyl containing film forming organic oligomer and an effective amount of an onium salt photoinitiator. These photocurable compositions can be used as photoresists.Type: GrantFiled: September 14, 1983Date of Patent: August 27, 1985Assignee: General Electric CompanyInventor: James V. Crivello
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Patent number: 4499176Abstract: Aqueous compositions useful in making stencils for screen printing by the direct, indirect or direct/indirect method comprise a photopolymerizable monomer, a water-insoluble photoinitiator, a tertiary amine accelerator, a water-soluble colloid, water, and a water-miscible organic solvent.Type: GrantFiled: September 22, 1982Date of Patent: February 12, 1985Assignee: Sericol Group LimitedInventors: John R. Curtis, John D. Renwick
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Patent number: 4457997Abstract: A two-component diazotype material, composed of a support and a light-sensitive layer which is applied thereto and contains a polymeric binder, a diazonium salt, a coupler, an acid stabilizer and conventional additives, wherein the support is a biaxially oriented polyester film and the polymeric binder comprises a mixture of about 10-60 percent by weight of a polymer or copolymer of vinyl acetate, for example, a copolymer of vinyl acetate and crotonic acid, and about 40-90 percent by weight of a cellulose ester, such as cellulose acetopropionate, cellulose acetobutyrate, cellulose propionate or cellulose butyrate.Type: GrantFiled: January 5, 1982Date of Patent: July 3, 1984Assignee: Hoechst AktiengesellschaftInventors: Klaus Thoese, Hans-Dieter Frommeld, Siegfried Scheler
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Patent number: 4356252Abstract: A photosensitive element which comprises a support bearing a layer of negative-working tonable photoimaging composition comprising at least one organic polymeric binder (a), a photosensitizer (b) which generates an acid upon absorption of actinic radiation, and at least one compound taken from the group of ##STR1## as defined, binder (a) being plasticized by the decomposition product of either compound (c) or (d) or the combination thereof. The photosensitive element is useful in making color proofs.Type: GrantFiled: May 4, 1981Date of Patent: October 26, 1982Assignee: E. I. Du Pont de Nemours and CompanyInventor: Ross A. Lee
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Patent number: 4294909Abstract: A photosensitive element which comprises a support bearing a layer of negative-working tonable photoimaging composition comprising at least one organic polymeric binder (a), a photosensitizer (b) which generates an acid upon absorption of actinic radiation, and at least one compound taken from the group of ##STR1## as defined, binder (a) being plasticized by the decomposition product of either compound (c) or (d) or the combination thereof. The photosensitive element is useful in making color proofs.Type: GrantFiled: December 26, 1979Date of Patent: October 13, 1981Assignee: E. I. Du Pont de Nemours and CompanyInventor: Ross A. Lee
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Patent number: 4289843Abstract: A photopolymerizable element suitable for use in the production of photorelief printing plates comprises a film or sheet, an adhesive layer and a photopolymerizable layer wherein the adhesive layer comprises a non-photopolymerizable plastics binder and a photopolymerization initiator comprising an admixture of a compound of the formula: ##STR1## preferably 4,4'-bis(dimethylamino)-benzophenone in an amount 0.01 to 2.0% by weight based upon the weight of the binder and another photopolymerization initiator in an amount 0.1 to 7% by weight based upon the weight of the binder.Type: GrantFiled: November 21, 1978Date of Patent: September 15, 1981Assignee: Bexford LimitedInventors: David L. Boutle, Stuart C. Rennison, Stuart G. Lambert
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Patent number: 4224398Abstract: A photopolymerizable system is provided as a latex system that is an oil-in-water polymer emulsion including particulates of water-insoluble polymers in combination with a water-soluble or water-dispersible, light-sensitive polymer having multiple light-sensitive moieties. Prior to coating onto a substrate, the system is a three-phase precursor emulsion of the emulsion particulates, the water phase, and the light-sensitive polymer. After coating, the bulk of the water phase is evaporated off, leaving a two-phase system of the emulsion particulates surrounded by the light-sensitive polymer. When selected areas are subjected to actinic radiation, a water-insoluble matrix is formed, the matrix containing cross-linked light-sensitive polymer having dispersed therethrough and/or included therein the water-soluble polymer particulates, thus forming oleophilic image areas.Type: GrantFiled: May 29, 1979Date of Patent: September 23, 1980Assignee: Richardson Graphics CompanyInventors: Thaddeus M. Muzyczko, Daniel C. Thomas
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Patent number: 4221859Abstract: The subject invention relates to photopolymerizable compositions useful for making plastic printing elements for use in photolithography and other photomechanical processes. The photopolymerizable compositions comprise an aqueous mixture of a water-insoluble resin, a water-soluble binder, a crosslinking agent, and a photopolymerization initiator having an alpha-keto ester linkage. In particular, photopolymerization initiators include oxalic acid, sodium oxalate, potassium oxalate, lithium oxalate and urea oxalate. The printing plates prepared from the compositions herein disclosed have improved ink receptivity, good retention of such ink, receptivity even after long continued use, greater durability and excellent binding qualities.Type: GrantFiled: May 4, 1976Date of Patent: September 9, 1980Assignee: Ball CorporationInventors: Gene O. Fanger, George W. Brutchen