EP0246538B1 - Emulsion de post-traitement de formes d'impression planographiques produites électrophotographiquement et procédé de production de plaques d'impression planographiques - Google Patents

Emulsion de post-traitement de formes d'impression planographiques produites électrophotographiquement et procédé de production de plaques d'impression planographiques Download PDF

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Publication number
EP0246538B1
EP0246538B1 EP87106849A EP87106849A EP0246538B1 EP 0246538 B1 EP0246538 B1 EP 0246538B1 EP 87106849 A EP87106849 A EP 87106849A EP 87106849 A EP87106849 A EP 87106849A EP 0246538 B1 EP0246538 B1 EP 0246538B1
Authority
EP
European Patent Office
Prior art keywords
emulsion
weight
planographic printing
present
amount
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
EP87106849A
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German (de)
English (en)
Other versions
EP0246538A1 (fr
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
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Filing date
Publication date
Application filed by Hoechst AG filed Critical Hoechst AG
Priority to AT87106849T priority Critical patent/ATE59909T1/de
Publication of EP0246538A1 publication Critical patent/EP0246538A1/fr
Application granted granted Critical
Publication of EP0246538B1 publication Critical patent/EP0246538B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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

Definitions

  • the present invention relates to an emulsion for the aftertreatment of planographic printing plates produced by electrophotography to improve the print quality.
  • the invention also relates to a method for producing planographic printing plates using the emulsion according to the invention.
  • the basic principle of this electrophotographic process is that a photoconductor layer, which is located on an electrically conductive substrate, is charged, imagewise exposed, developed with liquid or dry toner to form the image, the toner image is fixed by heating and the printing plate is detached by removing the unprotected areas of the image The photoconductor layer is stripped. The resulting offset printing form takes on 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 is able to hold dirt particles or can form an uneven, wrinkled surface.
  • a method for improving the print run of fixed electrophotographic printing forms which carry water in the image-free areas is also known (US Pat. No. 3,158,476), in which the image-free, stripped areas are coated with aqueous, colloidal agents and, after the coating has dried, the The printing form surface is treated with varnish containing organic solvents, which dissolves the fixed toner image and the underlying photoconductor layer and only firmly connects to the surface of the substrate at these image points. It is then treated with water, as a result of which the coating on the non-image areas comes off again.
  • an emulsion for the aftertreatment of electrophotographically produced planographic printing plates the characteristic feature of which is that it consists of 25 to 60% of an aqueous phase which contains a phosphonic acid compound and a water-soluble hydrophilizing polymer, and from 40 to 75% of one organic solvent phase, which is a hydrocarbon mixture with at least 20% of aromatic compounds.
  • the emulsion normally contains 25 to 60% aqueous phase. Particularly good results are obtained when 30 to 50% of the aqueous phase is present.
  • the above-mentioned object is achieved by a process for the production of planographic printing plates by electrophotography, in which the electroconductive layer on a support is charged, imagewise exposed and developed with liquid or dry toner, the toner image is fixed by heating and the plate is fixed Removal of the unprotected, non-image-free areas of the photoconductor layer, the characteristic feature of which is that, after stripping, the planographic printing plate is treated with an emulsion consisting of 25 to 60% of an aqueous phase which comprises a phosphonic acid compound and a water-soluble hydrophilizing polymer and 40 to 75% an organic solvent phase, which is a hydrocarbon mixture with at least 20% of aromatic compounds.
  • Examples of phosphonic acid compounds which can be used in the emulsion are vinylphosphonic acid, polyvinylphosphonic acid, vinylphosphonic acid monomethyl ester, aminotris methylenephosphonic acid and diethylenetriaminepenta- (methylenephosphonic acid). Further suitable compounds are described in DE-C 11 34 093. Polyvinylphosphonic acid and aminomethylenephosphonic acids are preferred.
  • the phosphonic acid compound can be used in a concentration of 0.05 to 10%, preferably 0.2 to 4%, in the emulsion.
  • emulsifiers are water-soluble film-forming polymers.
  • suitable substances are gum arabic, dextrin and polyvinyl alcohol.
  • the concentration of the polymer is generally 5 to 30% in the aqueous phase, preferably 10 to 20%.
  • hydrocarbon mixtures which contain at least 20, preferably 70 to 100%, aromatic components are suitable as hydrocarbon mixtures which can be used in the organic phase of the emulsion.
  • aromatic components i.e. alkyl substituted benzenes having about 8 to 15, especially 9 to 13, carbon atoms and higher naphtha compounds 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 / cm3 at 12 ° C, measured according to DIN 51 757, the boiling range between about 150 and 280 ° C.
  • the Kauributanol value according to ASTM D-1133 is generally between 70 and 100.
  • emulsifiers can be used in the treatment of printing plates in the emulsion substances used are present.
  • Polyglycol ethers are particularly suitable as emulsifiers.
  • a solution is applied to a 300 ⁇ m thick substrate made of electrolytically roughened and anodized aluminum, which has been treated with a 0.1% aqueous polyvinylphosphonic acid solution applied and dried to a uniform photoconductor layer with a weight of 5 g / m2.
  • the plate is charged with a corona to approximately -450 V and exposed imagewise in a repro camera with 8 autophot lamps of 500 W each for 25 seconds.
  • the resulting charge image is made with a toner powder developed and the toner image fixed by briefly heating to about 170 to 180 ° C.
  • the photoconductor layer is removed from the non-image areas by treatment with a solution and rinsed with water removed.
  • An emulsion is then applied, which consists of is prepared by presenting the aqueous phase, dissolving the emulsifier therein and adding the hydrocarbon mixture very slowly with vigorous stirring at about 1000 U / m.
  • the emulsion is rubbed over the printing plate (also mechanically). During this process, the toner dissolves and is removed from the plate using a squeegee and roller.
  • the remaining thin gum arabic layer can remain as a protective film on the printing plate if printing is about to take place.
  • an aromatic-rich hydrocarbon B can also be used.
  • the hydrocarbons A and B have the following key figures:
  • the printing forms treated according to the invention show very good print quality even in larger coherent full-tone areas.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)

Claims (12)

1. Emulsion pour le post-traitement de formes d'im­pression à plat produites par un moyen électrophotographique, caractérisée en ce qu'elle est constituée de 25 à 60% en poids d'une phase aqueuse qui contient un composé de type acide phosphonique et un polymère hydrophilisant soluble dans l'eau, et de 40 à 75% en poids d'une phase de solvant orga­nique qui est un mélange d'hydrocarbures comportant au moins 20% de composés aromatiques.
2. Emulsion selon la revendication 1, caractérisée en ce que la proportion de la phase aqueuse va de 30 à 50% en poids et celle de la phase de solvant organique va de 70 à 50% en poids.
3. Emulsion selon l'une des revendications 1 ou 2, caractérisée en ce que la quantité du composé de type acide phosphonique dans l'émulsion va de 0,05 à 10,0% en poids.
4. Emulsion selon la revendication 3, caractérisée en ce que la quantité de composé de type acide phosphonique va de 0,2 à 4,0% en poids.
5. Emulsion selon l'une des revendications 1 à 4, caractérisée en ce que, dans la phase aqueuse, la proportion du polymère hydrophilisant soluble dans l'eau va de 5 à 30% en poids.
6. Emulsion selon la revendication 5, caractérisée en ce que la proportion du polymère hydrophilisant dans la phase aqueuse va de 10 à 20% en poids.
7. Emulsion selon l'une des revendications 1 à 6, caractérisée en ce que le mélange de solvants contient des composants aromatiques qui sont des homologues à hauts points d'ébullition du benzène, en particulier des benzènes alkyl­substitués ayant de 8 à 15 atomes de carbone, et des composés supérieurs de naphta.
8. Emulsion selon la revendication 7, caractérisée en ce que le point d'inflammation du mélange de solvants se situe au-dessus de 40°C et le domaine d'ébullition est compris entre 150 et 280°C.
9. Emulsion selon l'une des revendications 1 à 8, caractérisée en ce qu'elle contient des émulsifiants et/ou des agents antimousses.
10. Procédé pour la fabrication d'une plaque d'impres­sion à plat par un moyen électrophotographique, dans lequel on charge la couche conductrice de l'électricité qui se trouve sur un support, on l'expose selon l'image, on la déve­loppe avec un toner liquide ou sec, on fixe par chauffage l'image de toner et on enlève la couche de la plaque par éli­mination des zones exemptes d'image, non protégées, de la couche photoconductrice, caractérisé en ce que, après l'enlè­vement de la couche, on traite la plaque d'impression à plat par une émulsion selon l'une des revendications 1 à 9.
11. Procédé selon la revendication 10, caractérisé en ce que l'on traite une plaque d'impression à plat comportant un support en aluminium.
12. Procédé selon la revendication 11, caractérisé en ce que l'on traite une plaque d'impression à plat comportant un support en aluminium grainé électrolytiquement et oxydé par anodisation.
EP87106849A 1986-05-21 1987-05-12 Emulsion de post-traitement de formes d'impression planographiques produites électrophotographiquement et procédé de production de plaques d'impression planographiques Expired - Lifetime EP0246538B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87106849T ATE59909T1 (de) 1986-05-21 1987-05-12 Emulsion zur nachbehandlung von elektrophotographisch hergestellten flachdruckformen und verfahren zur herstellung der flachdruckplatten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863617077 DE3617077A1 (de) 1986-05-21 1986-05-21 Emulsion zur nachbehandlung von elektrophotographisch hergestellten flachdruckformen und verfahren zur herstellung der flachdruckplatten
DE3617077 1986-05-21

Publications (2)

Publication Number Publication Date
EP0246538A1 EP0246538A1 (fr) 1987-11-25
EP0246538B1 true EP0246538B1 (fr) 1991-01-09

Family

ID=6301294

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87106849A Expired - Lifetime EP0246538B1 (fr) 1986-05-21 1987-05-12 Emulsion de post-traitement de formes d'impression planographiques produites électrophotographiquement et procédé de production de plaques d'impression planographiques

Country Status (7)

Country Link
US (1) US4748098A (fr)
EP (1) EP0246538B1 (fr)
JP (1) JPS62280769A (fr)
AT (1) ATE59909T1 (fr)
BR (1) BR8702592A (fr)
DE (2) DE3617077A1 (fr)
FI (1) FI872196A7 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5212030A (en) * 1989-11-21 1993-05-18 Plazer Ltd. Method and materials for producing a printing master
US5256190A (en) * 1992-03-16 1993-10-26 Barth Thomas M Universal chemical system for offset printing
US7252850B2 (en) * 2003-05-30 2007-08-07 Delavau Llc High protein and high fiber food products

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1117391B (de) * 1959-03-18 1961-11-16 Kalle Ag Elektrophotographisches Verfahren zur Herstellung von Druckformen
NL267931A (fr) * 1960-08-05 1900-01-01
BE612479A (fr) * 1961-01-13
ZA6807938B (fr) * 1967-12-04
AU507694B2 (en) * 1975-06-14 1980-02-21 Hoechst Aktiengesellschaft Electrophotographic reproduction
DE2855393A1 (de) * 1978-12-21 1980-07-03 Hoechst Ag Verfahren zum herstellen von flachdruckformen
DE3005695A1 (de) * 1980-02-15 1981-08-20 Hoechst Ag, 6000 Frankfurt Verfahren zur herstellung einer flachdruckform auf elektrophotographischem wege
DE3127668A1 (de) * 1981-07-13 1983-01-20 Hoechst Ag, 6000 Frankfurt Verfahren und loesung zum konservieren von flachdruckformen

Also Published As

Publication number Publication date
US4748098A (en) 1988-05-31
BR8702592A (pt) 1988-02-23
FI872196L (fi) 1987-11-22
DE3617077A1 (de) 1987-11-26
FI872196A7 (fi) 1987-11-22
DE3767206D1 (de) 1991-02-14
FI872196A0 (fi) 1987-05-19
ATE59909T1 (de) 1991-01-15
EP0246538A1 (fr) 1987-11-25
JPS62280769A (ja) 1987-12-05

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