[go: up one dir, main page]

US3107169A - Processes of producing lithographic electrostatic printing plates - Google Patents

Processes of producing lithographic electrostatic printing plates Download PDF

Info

Publication number
US3107169A
US3107169A US781352A US78135258A US3107169A US 3107169 A US3107169 A US 3107169A US 781352 A US781352 A US 781352A US 78135258 A US78135258 A US 78135258A US 3107169 A US3107169 A US 3107169A
Authority
US
United States
Prior art keywords
image
zinc oxide
resinous
parts
produce
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US781352A
Other languages
English (en)
Inventor
Dennis M Bornarth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bruning Charles Co Inc
Original Assignee
Bruning Charles Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE638380D priority Critical patent/BE638380A/xx
Priority to BE638066D priority patent/BE638066A/xx
Priority to NL299066D priority patent/NL299066A/xx
Priority to NL279066D priority patent/NL279066A/xx
Priority to US781352A priority patent/US3107169A/en
Application filed by Bruning Charles Co Inc filed Critical Bruning Charles Co Inc
Priority to GB35196/63A priority patent/GB1006624A/en
Priority to FR949271A priority patent/FR1375992A/fr
Priority to CH1245263A priority patent/CH422018A/de
Application granted granted Critical
Publication of US3107169A publication Critical patent/US3107169A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/02—Charge-receiving layers
    • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
    • G03G5/05—Organic bonding materials; Methods for coating a substrate with a photoconductive layer; Inert supplements for use in photoconductive layers
    • G03G5/0528—Macromolecular bonding materials
    • G03G5/0557—Macromolecular bonding materials obtained otherwise than by reactions only involving carbon-to-carbon unsatured bonds
    • G03G5/0575—Other polycondensates comprising nitrogen atoms with or without oxygen atoms in the main chain
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/08—Damping; Neutralising or similar differentiation treatments for lithographic printing formes; Gumming or finishing solutions, fountain solutions, correction or deletion fluids, or on-press development
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H7/00—Spinning or twisting arrangements
    • D01H7/02—Spinning or twisting arrangements for imparting permanent twist
    • D01H7/52—Ring-and-traveller arrangements
    • D01H7/60—Rings or travellers; Manufacture thereof not otherwise provided for ; Cleaning means for rings
    • D01H7/604—Travellers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/26—Electrographic processes using a charge pattern for the production of printing plates for non-xerographic printing processes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/02—Charge-receiving layers
    • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
    • G03G5/05—Organic bonding materials; Methods for coating a substrate with a photoconductive layer; Inert supplements for use in photoconductive layers
    • G03G5/0528—Macromolecular bonding materials
    • G03G5/0532—Macromolecular bonding materials obtained by reactions only involving carbon-to-carbon unsatured bonds
    • G03G5/0542—Polyvinylalcohol, polyallylalcohol; Derivatives thereof, e.g. polyvinylesters, polyvinylethers, polyvinylamines
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/02—Charge-receiving layers
    • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
    • G03G5/05—Organic bonding materials; Methods for coating a substrate with a photoconductive layer; Inert supplements for use in photoconductive layers
    • G03G5/0528—Macromolecular bonding materials
    • G03G5/0532—Macromolecular bonding materials obtained by reactions only involving carbon-to-carbon unsatured bonds
    • G03G5/0546—Polymers comprising at least one carboxyl radical, e.g. polyacrylic acid, polycrotonic acid, polymaleic acid; Derivatives thereof, e.g. their esters, salts, anhydrides, nitriles, amides
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/02—Charge-receiving layers
    • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
    • G03G5/05—Organic bonding materials; Methods for coating a substrate with a photoconductive layer; Inert supplements for use in photoconductive layers
    • G03G5/0528—Macromolecular bonding materials
    • G03G5/0532—Macromolecular bonding materials obtained by reactions only involving carbon-to-carbon unsatured bonds
    • G03G5/0553—Polymers derived from conjugated double bonds containing monomers, e.g. polybutadiene; Rubbers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/02—Charge-receiving layers
    • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
    • G03G5/05—Organic bonding materials; Methods for coating a substrate with a photoconductive layer; Inert supplements for use in photoconductive layers
    • G03G5/0528—Macromolecular bonding materials
    • G03G5/0557—Macromolecular bonding materials obtained otherwise than by reactions only involving carbon-to-carbon unsatured bonds
    • G03G5/0578—Polycondensates comprising silicon atoms in the main chain
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/37—Printing employing electrostatic force

Definitions

  • This invention relates to the production of lithographic printing plates and to such plates having a hydrophilic surface capable of receiving and retaining, during the printing operation, an aqueous wet-out solution immiscible with greasy lithographic printing ink and a hydrophobic surface capable of receiving the greasy lithographic printing
  • the ink is transferred from this hydrophobic surface directly, or indirectly through a conventional blanket, to paper or other printing surfaces.
  • This invention is particularly applicable to the production of lithographic printing plates having a paper base by treating a paper base having a photo-conductive insulating surface by an electrostatic printing technique to produce a visible record or copy, hereinafter referred to as an electrostatic copy, and conditioning this electrostatic copy to produce a lithographic printing plate which can be employed to make any desired number of additional copies.
  • Electrostatic printing techniques are known in which a surface of a conductive or semi-conductive backing or substrate having a photo-conductive insulating material thereon is charged electrostatically, and thereafter exposed to an optical image produced thereon by light rays which effect the discharge of the portions irradiated by the light rays while leaving the remainder of the surface in a charged condition, thus forming a latent electrostatic image.
  • Toner or developer powder is applied to the electrostatic latent image and held thereon by electrostatic attraction, thus producing a powder image which is fixed preferably by fusion, but may be fixed by use of solvent causing the powder particles to coalesce, or other known procedures.
  • the present invention permits conditioning an electrostatic copy by a simple operation requiring no special skill to produce a lithographic printing plate in a matter of about one minute, and sometimes less, which lithographic plate can be used to make additional copies, for example, in a conventional offset press.
  • the interval between completion of the electrostatic copy and its use on a press to make additional copies may be astonishingly short.
  • Another object of this invention is to provide a method of converting such electrostatic copy to a lithographic plate, which method is simple and fast, involving as it does a one step treatment of the copy, and results in a master or lithographic printing plate which can be run immediately to produce additional copies.
  • the lithographic printing plate produced by the process of this invention comprises a substrate or support, which preferably is paper including high Wet strength paper, an electrically-insulating resinous film-forming vehicle on this substrate having imbedded therein photo-conductive zinc oxide, a layer of hydrophobic resin covering the image areas, and a hydrophilic film formed by the reaction of a halide or sulphate of aluminum or iron (ferric state) with zinc oxide covering the non-image or background areas.
  • Such lithographic printing plates can be made by charging the zinc oxide containing photo-conductive surface on the substrate electrostatically, exposing the charged member to produce thereon a latent image of the material to be copied, applying resinous toner or developer powder so that it adheres electrostatically to the image areas and not to the non-image or background areas, fusing or otherwise fixing the resinous toner and then swabbing or wiping the resultant product with an aqueous solution of a halide or sulphate of aluminum or ferric iron.
  • the time elaspsed between production of the electrostatic copy and its utilization as a lithographic printing plate in accordance with this invention may be of the order of a minute or less.
  • the accompanying drawing shows for purposes of exemplification, a cross-section through a lithographic printing plate produced by the process of the present invention.
  • the drawing shows the parts on an enlarged scale to better illustrate the lithographic printing plate.
  • 1 indicates the substrate or base which preferably is paper, say a high wet strength paper, but may be a plastic film, metal foil, or any other base which is electrically-conductive or semi-conductive.
  • This base 1 is coated with an electrically-insulating resinous filmforming vehicle 2 having imbedded therein a photo-conductive grade of zinc oxide in particulate form, i.e., particles 3 of zinc oxide having a size of the order of. .2 micron.
  • a photo-conductive grade of zinc oxide in particulate form i.e., particles 3 of zinc oxide having a size of the order of. .2 micron.
  • An example of such zinc oxide is the Florence Green Seal 8 photo-conductive zinc oxide sold by the New Jersey Zinc Company. It will be understood that any photo-conductive zinc oxide in particulate or finely divided form may be employed, and this invention is not to be limited to either the particular size or grade of zinc oxide hereinabove disclosed for purposes of exemplification.
  • any electrically-insulating filmforming resin may be used.
  • resins are the Well known silicone resins, e.g., G.E. SR-82 marketed by the General Electric Company; melamine-formaldehyde resins, e. g., those marketed by the American Cyanarnid Company; polyvinyl acetate resins, e.
  • the resinous vehicle containing the photo-conductive zinc oxide may be applied to the substrate 1 by dissolving the resin in a suitable solvent, adding the zinc oxide to form a suspension of the zinc oxide in the resultant resin solution and applying the resultant suspension to the substrate 1.
  • an emulsion of the resin or resin mixture may be produced, the zinc oxide suspended in the emulsion and this emulsion system applied to the substrate 1 to form the photo-conductive insulating layer 2 containing particles 3 of photo-conductive zinc oxide imbedded in the surface thereof.
  • the resultant base is charged, for example, by exposing it to corona discharge or by passage over a charging roller which applies a uniform electrostatic charge over the entire surface thereof.
  • the charged member is then exposed to produce a latent image of the material to be copied.
  • Developer powder or toner is then applied to the image areas and held thereon by electrostatic attraction; the toner is thereafter fixed, i.e., made relatively permanent by heat fusion or solvent solution followed by evaporation of the solvent.
  • the toner or developer powder is a resinous material which when fixed has hydrophobic properties and will attract greasy inks.
  • developer powders are pigmented styrene polymers or polymers of substituted styrenes, e.g., Piccolastics marketed by the Pennsylvania Industrial Chemical Corporation of Clairton, Pennsylvania, pigmented phenol formaldehyde resins and other resins having hydrophobic properties.
  • the developer powder may be applied directly to the latent image or admixed with a carrier such as glass beads.
  • a carrier such as glass beads.
  • it is applied in the form of a mixture with magnetic particles such as magnetic iron, which mixture results in imparting a charge to the developer powder particles triboelectrically.
  • the developer powder is so chosen that it is attracted electrostatically to the chargedimage or repelled from the background area to to the charged image and held thereon by electrostatic attraction. It is preferred to apply a negative charge to the photo-conductive insulating material.
  • a positive toner is applied when the image areas have a negative charge. When the image areas have been discharged relative to the background areas, a negative toner is applied.
  • a preferred negative toner is a mixture of a resin polymer of styrene and styrene homologs (Piccolastic D), a similar resin modified by reaction with an alkyl ester of an aryl acid (Piccolast-ic C), carbon black and other pigment.
  • This negative toner is produced by mixing the resinous constituents with the carbon black and/or other dyestufi, melting the resins, solidifying the molten mixture, grinding the solid and mixing the ground particles with magnetic material such as iron.
  • An exemplary positive toner useful in producing the printing plates of this invention may consist of a mixture of Piccolastic D, Piccolastic C, polymerized butene resin, carbon black, Nigrosine dye and Iosol black. These constituents are mixed, the resins melted, the molten mixture solidified, ground to fine particle size, and the solidiiied ground particles mixed with magnetic iron imparting to the resin particles a positive charge triboelectrically.
  • layer 4 is a layer of fused resin produced by subjecting the image covered with the toner particles to heat to fuse the toner particles in the image areas.
  • the electrostatic copy produced by fixing the toner particles held electrostatically on the image areas is swabbed with an aqueous wet-out solution of an aluminum or ferric halide or sulphate.
  • an aluminum chloride solutions are preferred, aqueous solutions of ferric chloride, aluminum or ferric bromide, aluminum iodide, or aluminum or ferric sulphate can be used.
  • the concentration of the solution may be from 1% to 40% by weight of the aluminum or ferric salt, preferably 2% to 1 5% by weight.
  • the pH of the solution should be below 6, preferably from 1 to 3.5.
  • the welt-out solution may contain other constituents, such, for example, as glycerin, which is added primarily because it is hygroscopic and hence by absorption of water prolongs the period during which the hydrophilic surface 5 produced retains its hydrophilic properties.
  • glycerin which is added primarily because it is hygroscopic and hence by absorption of water prolongs the period during which the hydrophilic surface 5 produced retains its hydrophilic properties.
  • the resultant lithographic printing plate can be kept before use for relatively longer periods of time as compared with the use of a wet-out solution containing only the aluminum or ferric salt.
  • Other constituents which may be present are ammonium sulphate, gum arabic, formaldehyde and any of the constituents normally used in standard wet-out solutions, such, for example, as phosphoric acid.
  • Solutions containing formaldehyde and gum arabic generally result in lithographic printing plates which, after removal from the press, retain the hydrophilic properties in the non-image areas for relatively long periods of time so that the resultant printing plates can be reused without subjecting them to an addition& treatment with the wet-out solution.
  • wet-Out solutions which may Wet-Out Solution #1 4 parts aluminum chloride 96 parts water Wet-Out Solution #2 4 pants of aluminum chloride 6 parts glycerin parts water Wet-Out Solution #3 4 parts aluminum chloride 1 part ammonium sulphate 6 parts glycerin 111 parts water Wet-Out Solution #4 5 parts aluminum sulphate 1 part aluminum chloride 6 parts glycerin 1'11 parts water Wet-Out Solution #5 4 parts aluminum bromide 6 parts glycerin 90 parts water Wet-Out Solution #6 5 parts aluminum iodide 6 parts glycerin 90 pants water Wet-Out Solution #7 5 parts aluminum sulphate 6 parts glycerin 111 parts water Wet-Out Solution #8 4 parts aluminum chloride 1 part magnesium nitrate 1 part formaldehyde 60 parts gurn arabic'(10% gum) 30 parts water Wet-Out Solution 4 parts aluminum chloride 2 parts phosphoric acid 50 parts gum arabic'(10% gum) 1 part formaldeh
  • the aluminum or ferric halide or sulphate solution reacts with the zinc oxide 3 (which zinc oxide is exposed in the nonimage areas) to produce a hydrophilic surface 5 which prevents the penetration of the fountain solution in these areas and repels inks employed in lithographic printing. No such reaction takes place in the image areas, in which the zinc oxide is covered by the resinous toner layer 4, but the resinous coating 4 in the image areas retains its 6 hydrophobic properties and receives the greasy ink for transfer to the printing surface.
  • a lithographic printing plate produced in this manner can he run immediately or may he kept for as long as 10 minutes without re-etching, i.e., reprocessing with the Wet-out solution before being run.
  • the plate after treatment may be kept for a somewhat longer period before requiring reprocessing with the wet-out solution.
  • the present invention provides a process of producing lithographic printing plates from electrostatic copies, quickly and efficiently.
  • the method of this invention involves a one step treatment of the electrostatic copy and results in a master or lithographic printing plate which can be run immediately to produce additional copies.
  • This invention has been successfully practiced with a time interval of less than one minute, of the order of 40 to 50 seconds, :between the completion of the electrostatic copy and the utilization of the lithographic printing plate made therefrom to produce additional copies.
  • a method of producing lithographic printing plates which comprises, charging a support having a photo-conductive surface consisting essentially of photo-conductive zinc oxide imbedded in an electrically-insulating resinous film-forming layer covering the face of said support to produce an electrostatic charge thereon, exposing the charged support to a light image of material to be copied to produce a latent electrostatic image of said material, applying hydrophobic resinous developer powder to the latent electrostatic image thus produced so that said bydrophobic resinous powder adheres electrostatically to the charged image and not to the back-ground areas of said photo-conductive surface, fixing the hydrophobic resinous powder to produce an electrostatic copy in which the hydrophobic resinous layer thus formed defines the image areas and the said electrically-insulating resinous layer having the zinc oxide imbedded therein constitutes the background areas, and swab'hing the thus produced electrostatic copy with an aqueous solution of a salt from the group consisting of the halides and sulfates of aluminum and ferric iron to react the zinc oxide in
  • aqueous swabbing solution is an acidic solution of aluminum chloride containing from 1% to 40% by weight of aluminum chloride.
  • aqueous swabbing solution is an acidic solution of aluminum chloride containing from 2% to 15% by Weight of aluminum chloride.
  • aqueous sw-abbing 7 solution is an acidic solution of ferric chloride containing from 1% to 40% by Weight of ferric chloride.
  • aqueous s-Wabbin-g solution is an acidic solution of ferric chloride containing from 2% to 15% by Weight of ferric chloride.
  • aqueous solution of said salt from the group consisting of the halides and sulfates of aluminum and ferric iron is an acidic solution having a pH below 6 and containing phosphoric acid as the acidic constituent.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
US781352A 1958-12-18 1958-12-18 Processes of producing lithographic electrostatic printing plates Expired - Lifetime US3107169A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
NL299066D NL299066A (xx) 1958-12-18
NL279066D NL279066A (xx) 1958-12-18
BE638380D BE638380A (xx) 1958-12-18
BE638066D BE638066A (xx) 1958-12-18
US781352A US3107169A (en) 1958-12-18 1958-12-18 Processes of producing lithographic electrostatic printing plates
GB35196/63A GB1006624A (en) 1958-12-18 1963-09-05 Processes of producing lithographic electrostatic printing plates and such printing plates
FR949271A FR1375992A (fr) 1958-12-18 1963-10-01 Plaques d'impression lithographiques et procédé pour leur fabrication
CH1245263A CH422018A (de) 1958-12-18 1963-10-10 Verfahren zur Herstellung lithographischer Druckformen und nach dem Verfahren hergestellte Druckformen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US781352A US3107169A (en) 1958-12-18 1958-12-18 Processes of producing lithographic electrostatic printing plates

Publications (1)

Publication Number Publication Date
US3107169A true US3107169A (en) 1963-10-15

Family

ID=25122443

Family Applications (1)

Application Number Title Priority Date Filing Date
US781352A Expired - Lifetime US3107169A (en) 1958-12-18 1958-12-18 Processes of producing lithographic electrostatic printing plates

Country Status (5)

Country Link
US (1) US3107169A (xx)
BE (2) BE638066A (xx)
CH (1) CH422018A (xx)
GB (1) GB1006624A (xx)
NL (2) NL299066A (xx)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3198110A (en) * 1959-06-15 1965-08-03 Minnesota Mining & Mfg Lithographic printing plate with polymer coated metal image
US3245784A (en) * 1961-10-16 1966-04-12 Minnesota Mining & Mfg Lithographic master and process of preparation
US3247792A (en) * 1961-11-28 1966-04-26 Dick Co Ab Method for imaging planographic plate
US3250214A (en) * 1961-11-06 1966-05-10 Dick Co Ab Planographic printing
US3272121A (en) * 1963-02-14 1966-09-13 Plastic Coating Corp Lithographic printing plate prepared by photoelectrostatic reproduction, a method for its production and a method for lithographic printing
US3365324A (en) * 1963-03-18 1968-01-23 Bernice B Blake Solution development of xerographic latent images
US3413088A (en) * 1963-04-05 1968-11-26 Imp Smelting Corp Ltd Production of zinc oxide
US3429662A (en) * 1965-03-15 1969-02-25 American Zinc Co Zinc oxide
US3458310A (en) * 1964-01-11 1969-07-29 Kalle Ag Electrophotographic color printing
US3648608A (en) * 1967-01-27 1972-03-14 Olivetti & Co Spa Method and means for making a duplicating master
US3682095A (en) * 1970-05-22 1972-08-08 Olivetti & Co Spa Duplicating machine
US3908547A (en) * 1968-02-22 1975-09-30 Hoechst Ag Hydrophilizing solution for electrophotographic images
US3946671A (en) * 1972-09-28 1976-03-30 The Commonwealth Of Australia Electrostatic offset printing
US3965021A (en) * 1966-01-14 1976-06-22 Xerox Corporation Electrostatographic toners using block copolymers
US3970455A (en) * 1973-06-04 1976-07-20 Itek Corporation Electrostatic lithographic printing process utilizing hydrophilizing composition
US4705696A (en) * 1984-09-27 1987-11-10 Olin Hunt Specialty Products Inc. Method of making a lithographic printing plate, printing plates made by the method, and the use of such printing plates to make lithographic prints

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5695912A (en) * 1990-10-08 1997-12-09 Iwatsu Electric Co., Ltd. Desensitizing solution for offset printing

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2302816A (en) * 1941-01-11 1942-11-24 Toland Planographic printing
US2444205A (en) * 1944-03-27 1948-06-29 William G Mullen Lithographic printing plate
GB633747A (en) * 1947-05-09 1949-12-19 Warren S D Co Improvements in or relating to paper base planographic printing plates
GB648897A (en) * 1946-09-09 1951-01-17 Gevaert Photo Prod Nv Improvements in and relating to the production of planographic printing plates
US2760431A (en) * 1952-06-19 1956-08-28 Dick Co Ab Lithographic plates and methods for manufacturing same
US2857272A (en) * 1954-09-28 1958-10-21 Rca Corp Electrostatic printing
US2857271A (en) * 1954-09-28 1958-10-21 Rca Corp Electrostatic printing process for producing photographic transparencies
US2957765A (en) * 1957-06-13 1960-10-25 Gen Aniline & Film Corp Method of and composition for preparing lithographic printing plates
US2983220A (en) * 1955-03-16 1961-05-09 Timefax Corp Electro-sensitive planographic printing plate
US2993787A (en) * 1955-08-30 1961-07-25 Rca Corp Electrostatic printing
US3001872A (en) * 1957-03-18 1961-09-26 Xerox Corp Preparing planographic plates and solution therefor

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2302816A (en) * 1941-01-11 1942-11-24 Toland Planographic printing
US2444205A (en) * 1944-03-27 1948-06-29 William G Mullen Lithographic printing plate
GB648897A (en) * 1946-09-09 1951-01-17 Gevaert Photo Prod Nv Improvements in and relating to the production of planographic printing plates
GB633747A (en) * 1947-05-09 1949-12-19 Warren S D Co Improvements in or relating to paper base planographic printing plates
US2760431A (en) * 1952-06-19 1956-08-28 Dick Co Ab Lithographic plates and methods for manufacturing same
US2857272A (en) * 1954-09-28 1958-10-21 Rca Corp Electrostatic printing
US2857271A (en) * 1954-09-28 1958-10-21 Rca Corp Electrostatic printing process for producing photographic transparencies
US2983220A (en) * 1955-03-16 1961-05-09 Timefax Corp Electro-sensitive planographic printing plate
US2993787A (en) * 1955-08-30 1961-07-25 Rca Corp Electrostatic printing
US3001872A (en) * 1957-03-18 1961-09-26 Xerox Corp Preparing planographic plates and solution therefor
US2957765A (en) * 1957-06-13 1960-10-25 Gen Aniline & Film Corp Method of and composition for preparing lithographic printing plates

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3198110A (en) * 1959-06-15 1965-08-03 Minnesota Mining & Mfg Lithographic printing plate with polymer coated metal image
US3245784A (en) * 1961-10-16 1966-04-12 Minnesota Mining & Mfg Lithographic master and process of preparation
US3250214A (en) * 1961-11-06 1966-05-10 Dick Co Ab Planographic printing
US3247792A (en) * 1961-11-28 1966-04-26 Dick Co Ab Method for imaging planographic plate
US3272121A (en) * 1963-02-14 1966-09-13 Plastic Coating Corp Lithographic printing plate prepared by photoelectrostatic reproduction, a method for its production and a method for lithographic printing
US3365324A (en) * 1963-03-18 1968-01-23 Bernice B Blake Solution development of xerographic latent images
US3413088A (en) * 1963-04-05 1968-11-26 Imp Smelting Corp Ltd Production of zinc oxide
US3458310A (en) * 1964-01-11 1969-07-29 Kalle Ag Electrophotographic color printing
US3429662A (en) * 1965-03-15 1969-02-25 American Zinc Co Zinc oxide
US3965021A (en) * 1966-01-14 1976-06-22 Xerox Corporation Electrostatographic toners using block copolymers
US3648608A (en) * 1967-01-27 1972-03-14 Olivetti & Co Spa Method and means for making a duplicating master
US3908547A (en) * 1968-02-22 1975-09-30 Hoechst Ag Hydrophilizing solution for electrophotographic images
US3682095A (en) * 1970-05-22 1972-08-08 Olivetti & Co Spa Duplicating machine
US3946671A (en) * 1972-09-28 1976-03-30 The Commonwealth Of Australia Electrostatic offset printing
US3970455A (en) * 1973-06-04 1976-07-20 Itek Corporation Electrostatic lithographic printing process utilizing hydrophilizing composition
US4705696A (en) * 1984-09-27 1987-11-10 Olin Hunt Specialty Products Inc. Method of making a lithographic printing plate, printing plates made by the method, and the use of such printing plates to make lithographic prints

Also Published As

Publication number Publication date
BE638380A (xx)
NL299066A (xx)
NL279066A (xx)
GB1006624A (en) 1965-10-06
BE638066A (xx)
CH422018A (de) 1966-10-15

Similar Documents

Publication Publication Date Title
US3107169A (en) Processes of producing lithographic electrostatic printing plates
US2638416A (en) Developer composition for developing an electrostatic latent image
US4814250A (en) Electrophotographic toner and developer compositions containing dioctylsulfosuccinate and sodium benzoate charge control agents
US2877133A (en) Electrostatic photography
US3345294A (en) Developer mix for electrostatic printing
EP0405016B1 (en) Toner-receiving printing plate
US3752666A (en) Electrostatic imaging process using carrier beads containing conductive particles
US2659670A (en) Method of developing electrostatic images
US2618551A (en) Developer for electrostatic images
US3574614A (en) Process of preparing multiple copies from a xeroprinting master
US3573041A (en) Process for preparing a planographic printing plate
US3650797A (en) Developing electrostatic latent images with a mixture of positive and negative toners
US3884825A (en) Imaging composition
JPS5913023B2 (ja) 高表面積キャリア材料
US3607255A (en) Surfacing nonimage areas of lithographic master with hydrophilic desensitizing composition
US3155531A (en) Meagnetic liquid developer and method for electrostatic images
US2753308A (en) Xerography developer composition
DE1797232A1 (de) Bildempfangsmaterial fuer elektrophotographische Verfahren
EP0488437B1 (en) Method for obtaining lithographic printing plates by electrophotographic imaging
US3272121A (en) Lithographic printing plate prepared by photoelectrostatic reproduction, a method for its production and a method for lithographic printing
US3762944A (en) Electrothermographic duplicating sheet and process
US4430403A (en) Method of preparing a lithographic printing master
US4223085A (en) Semi-conductive nickel carrier particles
US3220830A (en) Method of developing a negative electrostatic latent image
US3916064A (en) Developer material