EP0027614B1 - Procédé de fabrication de formes d'impression - Google Patents

Procédé de fabrication de formes d'impression Download PDF

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Publication number
EP0027614B1
EP0027614B1 EP80106168A EP80106168A EP0027614B1 EP 0027614 B1 EP0027614 B1 EP 0027614B1 EP 80106168 A EP80106168 A EP 80106168A EP 80106168 A EP80106168 A EP 80106168A EP 0027614 B1 EP0027614 B1 EP 0027614B1
Authority
EP
European Patent Office
Prior art keywords
toner
weight
image
printing
toner image
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
EP80106168A
Other languages
German (de)
English (en)
Other versions
EP0027614A1 (fr
Inventor
Douglas A. Seeley
Victor M. Kamhi
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.)
CNA Holdings LLC
Original Assignee
American Hoechst Corp
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 American Hoechst Corp filed Critical American Hoechst Corp
Priority to AT80106168T priority Critical patent/ATE5550T1/de
Publication of EP0027614A1 publication Critical patent/EP0027614A1/fr
Application granted granted Critical
Publication of EP0027614B1 publication Critical patent/EP0027614B1/fr
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

Definitions

  • the present invention relates to a method for producing printing forms or printed circuits by electrophotography, in which a recording material consisting of a support and a photoconductive layer thereon is charged, imagewise exposed, developed with a developer to form a toner image and the layer on the areas free of toner images are removed with a solvent.
  • planographic printing with bimetal plates e.g. B. those made of copper-coated aluminum
  • a photoresist layer This is applied to the copper surface, exposed under a template and then developed. After development, the remaining photoresist layer is arranged imagewise, leaving a background of unprotected copper corresponding to the non-image areas.
  • the plate is then, e.g. B. etched with iron 111 chloride solution so as to dissolve the exposed copper. After rinsing, the remaining photoresist layer is removed with a suitable solvent, so that an oleophilic copper image is obtained on a hydrophilic aluminum support. To intensify its oleophilic behavior, the copper can also be treated with dilute acids.
  • Offset printing plates for imaging by electrophotography contain a photoconductive substance in the light-sensitive layer, e.g. B. from zinc oxide, cadmium sulfide or certain organic compounds which are dispersed in an ink-repellent binder and on a suitable support, for. B. paper, metal or foil is applied.
  • the plates are imaged using a conventional electrophotographic method, i. H. An electrostatic charge is generated on the photoconductive layer and exposed imagewise.
  • the resulting latent electrostatic image is made visible by a liquid or solid electroscopic developer and the developed image is fixed by drying or heating.
  • the imaged plate thus obtained can then be used as a printing form.
  • the melted or fixed toner is present in an imagewise arrangement on the photoconductor layer.
  • the surface can be treated with a stripping solution, whereby the photoconductive layer is loosened at the toner image-free areas so that the metallic carrier surface is visible.
  • the plate is clamped in the printing press.
  • the oleophilic toner above the image areas takes on color and transfers it to the rubber blanket used in offset printing or directly to the paper for direct flat printing, while the stripped areas, like normal flat printing, take on water and repel printing ink.
  • the printing forms can be used in automatic machines operating with incoherent light, e.g. B. according to US-PS 3999511 (DE-GM 74 18 392) or in fully automatic laser exposure devices, such as. B. U.S. Patent 4,149,798, charged, exposed, developed and stripped.
  • This object is achieved in a process of the type described in the introduction in that the toner image is then treated with methylcyclohexane, mesitylene, tetrahydronaphtaline, decahydronaphtaline or with a hydrocarbon mixture of 5-45% by weight aliphatic, 25-95% by weight aromatic and 0-60% by weight naphthenic content this removes the toner particles from the image areas.
  • the toner image is preferably treated with a Hydrocarbon mixture of 43 percent by weight from aliphatic, 29 percent by weight aromatic and 28 percent by weight naphthenic content with a boiling range between 140 and 210 ° C.
  • FIG. 1 shows the concrete (development), FIG. 2 the melting of the toner (fixation), FIG. 3 the stripping, i. H. the detachment at the non-image areas and Fig. 4 the removal of the toner.
  • the figure shows the insulating photoconductive layer 2 on a conductive layer support 1 with an image part or pixel made of toner 3 lying immediately after the development on the photoconductive layer. 2 shows the toner point 3a after melting. The figure shows the stripping or removal of the photoconductive layer 2 at the points not protected by the melted toner image.
  • FIG. 4 shows a pixel made of a photoconductive layer as it remains on the substrate 1 after the toner has been removed.
  • Suitable solvents according to the invention for removing the melted toner are the hydrocarbons mentioned.
  • the basic requirements placed on such a solvent are a high solvency for melted toner and little or no attack on the photoconductor layer. These two requirements can be described as “solubility differentiation”.
  • the solvent it is also important to ensure that after the treatment there are no signs of color acceptance at the non-image areas, that the color acceptance is not disturbed by the image and that there is good color transfer to the blanket or paper and that there is none Image loss occurs when printing.
  • the solvents have the highest possible flash point, e.g. B. have above 40 ° C to reduce the flammability as much as possible.
  • Suitable solvents are individually or in a mixture: methylcyclohexane, mesitylene, tetrahydronaphthalene, decahydronaphthalene and commercially available hydrocarbon mixtures with 25-95% by weight aromatic, 0-60% by weight naphthenic and 5-45% by weight aliphatic Shares.
  • a mixture of 5 percent by weight of an aliphatic and 95 percent by weight of an aromatic hydrocarbon is preferably used according to the invention.
  • the liquid or dry developers known in electrophotographic practice are used to develop or make the latent charge image visible.
  • the dry developers are fine powdered, pigmented thermoplastics that are charged opposite to the charge on the image so that they are attracted to the image as it is developed.
  • the liquid developers contain pigment particles that are suspended in a highly insulating liquid. When the charged image is sprayed or briefly immersed in the liquid toner, the charged particles are deposited thereon. The excess liquid is removed. Following the development, the now visible image is fixed or the pigment particles are melted. You can work with heat or with solvent vapors.
  • the preferred photoconductors include organic substances such as the various oxazole compounds described in U.S. Patent 3,257,203 (DE-PS 1 120 875), e.g. B. 4,5-diphenyloxazoles, triphenylamine derivatives, more highly condensed aromatic compounds, such as anthracene, fused benzene rings containing heterocyclic compounds, pyrazoline and imidazole derivatives, triazole and oxadiazole derivatives according to US Pat. No. 3189447 (DE-PS 1 058 836), in particular 2, 5-bis (4'-dialkylaminophenyl) -1,3,4-oxadiazoles and vinyl aromatic polymers, e.g. B.
  • organic substances such as the various oxazole compounds described in U.S. Patent 3,257,203 (DE-PS 1 120 875), e.g. B. 4,5-diphenyloxazoles, triphenylamine derivatives, more highly condensed aromatic compounds, such as an
  • the photoconductive layer can also contain resin binders and a sensitizer or activator which selectively make the photoconductive substance light-sensitive, e.g. B. for light with a wavelength of 400 to 500 nm.
  • the toner image-free areas of the photoconductive layer must be removed for offset printing, without affecting the stressed image areas.
  • the substrate has good electrical conductivity.
  • Metal plates e.g. B. made of aluminum, zinc, magnesium or copper and cellulose-based plates, for. B. special papers, cellulose hydrate, cellulose acetate or cellulose butyrate films can be used.
  • plastics such as. B. polyamides in the form of foils or metalized foils, can be used as a layer support.
  • the process steps of electrostatic charging, exposure with incoherent or laser light, development with a finely divided toner, fixing and decoating can be carried out in separate operations be carried out manually or continuously in automatic machines.
  • Figure 1 shows a portion of the electrophotographic recording material immediately after development.
  • the conductive layer support has the reference number 1.
  • the insulating photoconductive layer 2 adheres directly to the support, while part of the image consisting of unmelted toner is designated by the reference number 3.
  • 2 shows the toner image 3a which has now been melted by the heat emitted by a heat source 6.
  • FIG. 3 shows the stripping step in which the stripping solution 4 drips from a vessel onto the photoconductive layer. It is removed in all areas not protected by the melted toner.
  • the melted toner and the underlying photoconductive layer are arranged imagewise on the substrate.
  • the printing form has been used for printing in this form.
  • the solvents which are suitable according to the invention are examined for their effect in removing the toner from the image areas.
  • a test device is used that tests the wash resistance and the abrasion of toner and photoconductive layer components in one go.
  • There are e.g. B. 30 ml of the solvent to be tested is placed on a damp tampon and the printing form is wiped with the damp tampon until all the toner has been removed. The result is shown in the attached examples.
  • non-concrete-recording material is dried in a blower oven at 180 ° C. for 40 seconds. These samples are wiped with 30 ml of each solvent using the same procedure in the above tester. In each case, ten times the number of wiping strokes is carried out, which was necessary for the removal of the toner with the solvent in question. The amount of coating removed is then determined from the weight loss.
  • 121 decoating solution are entered in the decoating area in the first station.
  • the solution consists of ethoxy-ethoxyethanol, n-propanol, sodium metasilicate and tripotassium phosphate.
  • 5 liters of a hydrocarbon mixture which is composed of 29% by weight aromatics with more than 8 carbon atoms, 28% by weight naphthenes and 43% by weight paraffins or isoparaffins, and a boiling range between about 149 and 204 ° C, filled.
  • a dilute phosphoric acid solution is fed into a third station 5.
  • An electrophotographic recording material with an insulating photoconductor layer serves as the sample. After concreting, melting takes place at 150 ° C. The stripping takes place at 30 ° C at a throughput speed of about 4.3 cm / s.
  • Solvents suitable according to the invention are tested on the continuous test device described for determining the wash resistance and abrasion in order to determine the required number of wiping passes for toner removal and the percentage of the remaining portions of the photoconductive layer with ten times the number of wiping passes with each solvent.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Manufacturing Of Printed Circuit Boards (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Printing Methods (AREA)
  • Soft Magnetic Materials (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Claims (3)

1. Procédé de fabrication de formes d'impression ou de circuits imprimés par voie électrophotogra- phique, dans lequel un matériau d'enregistrement se composant d'un support et d'une couche photoconductrice disposée dessus, est chargé, exposé selon une image, développé avec un révélateur pour donner une image de révélateur et la couche est éliminée par dissolution aux endroits exempts d'image de révélateur avec un solvant, caractérisé en ce qu'on traite ensuite l'image de révélateur avec du méthylcyclohexane, du mésitylène, du tétrahydronaphtalène, du décahydronaphtalène ou un mélange d'hydrocarbures constitué de 5 à 45 % en poids de fraction aliphatique, 25 à 95 % en poids de fraction aromatique et 0 à 60 % en poids de fraction naphténique et on élimine ainsi les particules de révélateur des endroits image.
2. Procédé suivant la revendication 1, caractérisé en ce qu'on traite l'image de révélateur par un mélange d'hydrocarbures constitué de 43 % en poids de fraction aliphatique, 29 % en poids de fraction aromatique et 28 % en poids de fraction naphténique ayant un domaine d'ébullition entre 140 et 210 °C.
3. Procédé suivant la revendication 1, caractérisé en ce qu'on traite l'image de révélateur par un mélange de 5 % en poids d'un hydrocarbure aliphatique et 95 % en pc'ds d'un hydrocarbure aromatique.
EP80106168A 1979-10-18 1980-10-10 Procédé de fabrication de formes d'impression Expired EP0027614B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80106168T ATE5550T1 (de) 1979-10-18 1980-10-10 Verfahren zum herstellen von druckformen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US86081 1979-10-18
US06/086,081 US4254196A (en) 1979-10-18 1979-10-18 Method of preparing lithoplates and plate

Publications (2)

Publication Number Publication Date
EP0027614A1 EP0027614A1 (fr) 1981-04-29
EP0027614B1 true EP0027614B1 (fr) 1983-12-07

Family

ID=22196133

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80106168A Expired EP0027614B1 (fr) 1979-10-18 1980-10-10 Procédé de fabrication de formes d'impression

Country Status (8)

Country Link
US (1) US4254196A (fr)
EP (1) EP0027614B1 (fr)
JP (1) JPS5666863A (fr)
AT (1) ATE5550T1 (fr)
BR (1) BR8006695A (fr)
CA (1) CA1146011A (fr)
DE (1) DE3065838D1 (fr)
ZA (1) ZA806404B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3005695A1 (de) * 1980-02-15 1981-08-20 Hoechst Ag, 6000 Frankfurt Verfahren zur herstellung einer flachdruckform auf elektrophotographischem wege
GB2119942B (en) * 1982-03-03 1985-09-11 Fuji Photo Film Co Ltd Method for preparing a lithographic printing plate and a light-sensitive material used therefor
JP2503000Y2 (ja) * 1990-03-07 1996-06-26 三菱電機株式会社 探触子回転型超音波探傷装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1071478B (fr) * 1957-03-01
NL259537A (fr) * 1959-12-29
DE1522497C3 (de) * 1966-05-13 1974-09-19 Kalle Ag, 6202 Wiesbaden-Biebrich Verfahren zum Herstellen von Druckformen
DE1572312B2 (de) * 1967-04-13 1977-04-28 Hoechst Ag, 6000 Frankfurt Verfahren zum herstellen von druckformen
GB1244901A (en) * 1968-01-18 1971-09-02 Tokyo Shibaura Electric Co An electrostatic recording apparatus
US3944417A (en) * 1968-11-27 1976-03-16 Hoechst Aktiengesellschaft Process for the electrophotographic production of printing plates
US4066453A (en) * 1973-05-02 1978-01-03 Hoechst Aktiengesellschaft Process for the preparation of printing forms
NL7404998A (fr) * 1973-05-02 1974-11-05
US4096083A (en) * 1975-05-29 1978-06-20 Imperial Chemical Industries Limited Cleaning methods and compositions

Also Published As

Publication number Publication date
EP0027614A1 (fr) 1981-04-29
CA1146011A (fr) 1983-05-10
ZA806404B (en) 1981-10-28
ATE5550T1 (de) 1983-12-15
JPS5666863A (en) 1981-06-05
JPH0150906B2 (fr) 1989-11-01
DE3065838D1 (en) 1984-01-12
BR8006695A (pt) 1981-04-22
US4254196A (en) 1981-03-03

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