EP0034317B1 - Verfahren zur Herstellung einer Flachdruckform auf elektrophotographischem Wege - Google Patents

Verfahren zur Herstellung einer Flachdruckform auf elektrophotographischem Wege Download PDF

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Publication number
EP0034317B1
EP0034317B1 EP81100886A EP81100886A EP0034317B1 EP 0034317 B1 EP0034317 B1 EP 0034317B1 EP 81100886 A EP81100886 A EP 81100886A EP 81100886 A EP81100886 A EP 81100886A EP 0034317 B1 EP0034317 B1 EP 0034317B1
Authority
EP
European Patent Office
Prior art keywords
image
toner
photoconductive layer
areas
solution
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
Application number
EP81100886A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0034317A2 (de
EP0034317A3 (en
Inventor
Loni Schell
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.)
Hoechst AG
Original Assignee
Hoechst AG
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
Application filed by Hoechst AG filed Critical Hoechst AG
Priority to AT81100886T priority Critical patent/ATE5350T1/de
Publication of EP0034317A2 publication Critical patent/EP0034317A2/de
Publication of EP0034317A3 publication Critical patent/EP0034317A3/de
Application granted granted Critical
Publication of EP0034317B1 publication Critical patent/EP0034317B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • G03G13/28—Planographic printing plates
    • 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

  • the invention relates to a method for producing a planographic printing form by electrophotography.
  • a photoconductor layer which is located on an electrically conductive substrate, is charged, imagewise exposed, developed with liquid or dry toner for the image, the toner image is fixed by heating and the printing plate is stripped by removing the unprotected, non-image areas of the photoconductor layer .
  • the resulting offset printing form assumes ink at the toner image areas and water at the exposed areas of the substrate surface.
  • the toner which normally contains a resin which is soluble in organic solvents, swells on prolonged contact with printing ink, becomes sticky and can hold dirt particles or can form an uneven, wrinkled surface.
  • a method for improving fixed electrophotographic printing forms which carry water in the non-image areas is also known (US Pat. No. 3,158,476), in which the non-image areas are coated with aqueous colloidal agents and, after the coating has dried, the printing plate surface is treated with lacquer containing organic solvents , which dissolves the fixed toner image and the underlying photoconductor layer and firmly connects to the surface of the substrate. It is then treated with water, as a result of which the coating on the non-image areas comes off again.
  • This also means that it is not yet possible to provide a printing form that meets the highest demands, since the lacquer applied also swells, has imperfections in the image areas and the printing forms produced tend to undesirable toning.
  • the invention has for its object to propose a method for producing printing forms of the type specified above, in which the disadvantages described are avoided.
  • the invention is based on a method for producing a planographic printing plate by electrophotography, in which an oleophilic photoconductor layer, which contains photoconductor and binder, and which is located on an electrically conductive hydrophilic substrate is uniformly charged, imagewise exposed, stressed and fixed, and the image-free areas of the photoconductor layer removed with a stripping agent and then coated with aqueous colloidal agents and the fixed toner image is removed, and the image-free areas are exposed again if necessary by washing with water.
  • the process according to the invention is characterized in that after stripping, the exposed areas of the support are coated with the solution of a water-soluble film-forming polymer which is insoluble in hydrocarbon solvents and with a vinylphosphonic acid compound, the solution is dried to a uniform coating and then the toner is washed out with a hydrocarbon mixture, which contains at least about 20% by weight of aromatic components, is removed from the photoconductor layer.
  • the process according to the invention ensures that the toner is completely detached from the underlying image-like photoconductor layer without oleophilic substances being deposited in the non-image areas of the layer support, which lead to the printing form being toned. As a result, the printing form maintains an error-free reproduction of the full tones.
  • Another advantage of the method according to the invention is an improved tonal value reproduction, in particular in the case of raster images, since the image elements which are somewhat widened by the melted toner are returned to their original size by detaching the toner.
  • hydrocarbon mixtures which contain at least 20, preferably 70-100%, aromatic components are suitable as hydrocarbon mixtures in which the melted toner image is soluble.
  • aromatic components i. H. alkyl substituted benzenes having about 8 to 15, especially 9 to 13 carbon atoms can be used.
  • the proportion of harmful components such as trimethylbenzene and propylbenzene should be kept as low as possible and the flash point of the mixture should be above 40 ° C.
  • Other higher-boiling hydrocarbons, in particular naphthenes can be used as non-aromatic constituents.
  • the density of the hydrocarbon mixture can be between 0.85 and 0.95 g / ccm at 12 ° C, measured according to DIN 51757, the boiling range between about 150 and 280 ° C.
  • the Kauributanol value according to ASTM D-1133 is generally between 70 and 100.
  • the hydrophilic carrier surface is protected against contamination by the organic toner solution by coating the surface of the substrate which was exposed during the stripping with the aqueous solution of a film-forming polymer and a vinylphosphonic acid compound.
  • Suitable as water-soluble film-forming polymers are basically all such substances which are usually used as components of preservation solutions for planographic printing plates.
  • suitable substances are gum arabic, dextrin and polyvinyl alcohol.
  • the concentration of the polymer is generally between 4 and 30, preferably between 5 and 15%.
  • vinylphosphonic acid compounds examples include vinylphosphonic acid, polyvinylphosphonic acid and vinylphosphonic acid monomethyl ester. Further suitable compounds are described in DE-C 11 34093. Polyvinylphosphonic acid is preferred.
  • the vinylphosphonic acid compound can be used in a concentration of 0.05 to 10, preferably 0.2 to 4% by weight.
  • the plate surface After treatment with the hydrocarbon solvent, the plate surface is normally rinsed with water, the water-soluble protective coating being removed together with any toner residues still adhering, and the printing form being given a clean appearance. If this should not be printed immediately, it is then coated with a conventional preservative solution and dried. However, it is also possible, particularly if the printing form freed from toner according to the invention is to be stored only for a short time, to leave the protective layer of water-soluble polymers and vinylphosphonic acid compound in the non-image areas and to wash it off with water only at the beginning of the printing process.
  • Organic photoconductors are preferably used as photoconductors, for example those as described in DE-C 11 20 875 or DE-B 25 26 720.
  • Suitable binders in the photoconductor layer are preferably those which are insoluble in water and soluble in aqueous alkaline solutions. Copolymers containing carboxyl groups are particularly preferred. The production of suitable electrophotographic materials and their processing into printing forms is described in the publications mentioned above.
  • the plate was charged with a corona to approximately - 450 V and exposed in a repro camera with 8 autophot lamps of 500 W each for 25 seconds.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
EP81100886A 1980-02-15 1981-02-09 Verfahren zur Herstellung einer Flachdruckform auf elektrophotographischem Wege Expired EP0034317B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81100886T ATE5350T1 (de) 1980-02-15 1981-02-09 Verfahren zur herstellung einer flachdruckform auf elektrophotographischem wege.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3005695 1980-02-15
DE19803005695 DE3005695A1 (de) 1980-02-15 1980-02-15 Verfahren zur herstellung einer flachdruckform auf elektrophotographischem wege

Publications (3)

Publication Number Publication Date
EP0034317A2 EP0034317A2 (de) 1981-08-26
EP0034317A3 EP0034317A3 (en) 1981-09-02
EP0034317B1 true EP0034317B1 (de) 1983-11-16

Family

ID=6094712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81100886A Expired EP0034317B1 (de) 1980-02-15 1981-02-09 Verfahren zur Herstellung einer Flachdruckform auf elektrophotographischem Wege

Country Status (7)

Country Link
US (1) US4388391A (enrdf_load_stackoverflow)
EP (1) EP0034317B1 (enrdf_load_stackoverflow)
JP (1) JPS56130766A (enrdf_load_stackoverflow)
AT (1) ATE5350T1 (enrdf_load_stackoverflow)
AU (1) AU534440B2 (enrdf_load_stackoverflow)
CA (1) CA1146790A (enrdf_load_stackoverflow)
DE (2) DE3005695A1 (enrdf_load_stackoverflow)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3409888A1 (de) * 1984-03-17 1985-09-19 Hoechst Ag, 6230 Frankfurt Lichtempfindliches aufzeichnungsmaterial und dessen verwendung in einem verfahren zum herstellen einer druckform oder einer gedruckten schaltung
DE3617077A1 (de) * 1986-05-21 1987-11-26 Hoechst Ag Emulsion zur nachbehandlung von elektrophotographisch hergestellten flachdruckformen und verfahren zur herstellung der flachdruckplatten
US5545381A (en) * 1991-01-31 1996-08-13 Ricoh Company, Ltd. Device for regenerating printed sheet-like recording medium
US5605777A (en) * 1992-08-31 1997-02-25 Ricoh Company, Ltd. Method and apparatus for regenerating image holding member
JP3345472B2 (ja) * 1992-08-31 2002-11-18 株式会社リコー 画像保持支持体の再生方法
JPH07140704A (ja) * 1993-09-22 1995-06-02 Ricoh Co Ltd 像保持体の繰り返し使用方法
JP2691512B2 (ja) * 1993-09-22 1997-12-17 株式会社リコー 像保持体からの像形成物質除去方法及びその装置
US5642550A (en) * 1994-02-28 1997-07-01 Ricoh Company, Ltd. Apparatus for removing image forming substance from image holding member
JPH08166747A (ja) * 1994-10-14 1996-06-25 Ricoh Co Ltd シート材からの付着物除去装置
DE4447104A1 (de) * 1994-12-29 1996-07-04 Hoechst Ag Verfahren zum Herstellen von Farbbildern auf elektrophotographischem Wege
US5750314A (en) 1995-12-05 1998-05-12 Howard A. Fromson Method for selectively imaging a lithographic printing plate

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3121009A (en) * 1960-03-16 1964-02-11 Rca Corp Preparation of etched plates
US3158476A (en) * 1961-01-13 1964-11-24 Azoplate Corp Process for the improvement of fixed electrophotographic printing plates which are water-conductive in the image-free parts
US3276868A (en) * 1960-08-05 1966-10-04 Azoplate Corp Planographic printing plates

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE581861A (enrdf_load_stackoverflow) 1958-08-20
DE1117391B (de) 1959-03-18 1961-11-16 Kalle Ag Elektrophotographisches Verfahren zur Herstellung von Druckformen
NL131134C (enrdf_load_stackoverflow) * 1964-07-29
US3396020A (en) * 1965-11-16 1968-08-06 Azoplate Corp Planographic printing plate
US3745028A (en) * 1971-04-26 1973-07-10 Eastman Kodak Co Lithographic plate desensitizer formulations
US4066453A (en) * 1973-05-02 1978-01-03 Hoechst Aktiengesellschaft Process for the preparation of printing forms
AU507694B2 (en) * 1975-06-14 1980-02-21 Hoechst Aktiengesellschaft Electrophotographic reproduction
JPS54144203A (en) * 1978-05-01 1979-11-10 Fuji Yakuhin Kogyo Kk Method of making flat printing plate
US4254196A (en) * 1979-10-18 1981-03-03 American Hoechst Corporation Method of preparing lithoplates and plate

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3121009A (en) * 1960-03-16 1964-02-11 Rca Corp Preparation of etched plates
US3276868A (en) * 1960-08-05 1966-10-04 Azoplate Corp Planographic printing plates
US3158476A (en) * 1961-01-13 1964-11-24 Azoplate Corp Process for the improvement of fixed electrophotographic printing plates which are water-conductive in the image-free parts

Also Published As

Publication number Publication date
US4388391A (en) 1983-06-14
DE3005695A1 (de) 1981-08-20
AU6726881A (en) 1981-08-20
DE3161391D1 (en) 1983-12-22
EP0034317A2 (de) 1981-08-26
JPH027460B2 (enrdf_load_stackoverflow) 1990-02-19
EP0034317A3 (en) 1981-09-02
CA1146790A (en) 1983-05-24
ATE5350T1 (de) 1983-12-15
AU534440B2 (en) 1984-01-26
JPS56130766A (en) 1981-10-13

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