EP0093960B1 - Procédé de grainage électrochimique de l'aluminium pour des supports de plaques d'impression - Google Patents

Procédé de grainage électrochimique de l'aluminium pour des supports de plaques d'impression Download PDF

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Publication number
EP0093960B1
EP0093960B1 EP83104144A EP83104144A EP0093960B1 EP 0093960 B1 EP0093960 B1 EP 0093960B1 EP 83104144 A EP83104144 A EP 83104144A EP 83104144 A EP83104144 A EP 83104144A EP 0093960 B1 EP0093960 B1 EP 0093960B1
Authority
EP
European Patent Office
Prior art keywords
aluminum
und
alternating current
von
roughening
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
EP83104144A
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German (de)
English (en)
Other versions
EP0093960A1 (fr
Inventor
Engelbert Dr. Dipl.-Chem. Pliefke
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
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Hoechst AG
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Filing date
Publication date
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Application filed by Hoechst AG filed Critical Hoechst AG
Publication of EP0093960A1 publication Critical patent/EP0093960A1/fr
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Classifications

    • 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
    • B41N3/03—Chemical or electrical pretreatment
    • B41N3/034—Chemical or electrical pretreatment characterised by the electrochemical treatment of the aluminum support, e.g. anodisation, electro-graining; Sealing of the anodised layer; Treatment of the anodic layer with inorganic compounds; Colouring of the anodic layer
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/02—Etching
    • C25F3/04—Etching of light metals
    • 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
    • Y10S204/00—Chemistry: electrical and wave energy
    • Y10S204/09—Wave forms

Definitions

  • the invention relates to a process for the electrochemical roughening of aluminum or its alloys for printing plate supports, which in an acidic aqueous electrolyte which contains HCI or HN0 3 as the sole acid, optionally together with aluminum nitrate, under the action of an alternating current with a frequency of 0.3 up to 15 Hz.
  • Printing plates generally consist of a support and at least one radiation-sensitive reproduction layer arranged thereon, this layer either from the consumer (in the case of non-precoated plates) or from the industrial one Manufacturer (for pre-coated boards) is applied to the substrate.
  • Aluminum or one of its alloys has established itself as a layer material in the printing plate field.
  • these substrates can also be used without a modifying pretreatment, but they are generally modified in or on the surface, for example by mechanical, chemical and / or electrochemical roughening (sometimes also called grain or etching in literature), chemical or electrochemical oxidation and / or treatment with hydrophilizing agents.
  • a combination of the above-mentioned types of modification is often used, in particular a combination of electrochemical roughening and anodic oxidation, optionally with a subsequent hydrophilization step.
  • the roughening is carried out, for example, in aqueous acids such as aqueous HCI or HN0 3 solutions or in aqueous salt solutions such as aqueous NaCl or Al (NO 3 ) 3 solutions using alternating current.
  • the roughness depths that can be achieved in this way are in the range from about 1 to 15 ⁇ m, in particular in the range from 2 to 8 pm.
  • the roughness depth is determined in accordance with DIN 4768 in the version from October 1970, the roughness depth R z is then the arithmetic mean of the individual roughness depths of five adjacent individual measuring sections.
  • the pulsed direct current according to US Pat. No. 3,085,950 has a frequency between 20 and 6000 Hz, in particular at approximately 100 Hz, and a pulse duration of 5 to 100 psec, in particular of approximately 20 psec; in the intervening times, the current intensity drops to 0.
  • This treatment is intended to roughen the surface of aluminum foils which are used as electrolytic capacitors.
  • GB-A 1 027 695 is concerned with a four-stage process for the treatment of aluminum or its alloys, in the second stage of the process an electrochemical etching using an electrolyte from nitric acid, a lignosulfonic acid-containing sulfite liquor and an organic compound, frequencies being used from 15 to 75 Hz.
  • the products treated according to the four-step process can be used as printing plates.
  • US-A4279714 and US-A 4,279,715 describe the roughening of aluminum for the field of electrolytic capacitors, in which alternating current of a frequency in the range from 20 to 60 Hz is used.
  • a hydrochloric acid electrolyte in combination with at least one additive e.g. organic or inorganic acids or their salts can be used for etching.
  • a frequency range from 5 to 120 Hz is mentioned.
  • the object of the present invention is therefore to propose a method for the electrochemical roughening of aluminum, which is carried out with alternating current and leads to such a uniform roughening structure that the aluminum can be used as a printing plate carrier.
  • the invention is based on the known method for the electrochemical roughening of aluminum or its alloys for printing plate supports in an aqueous electrolyte under the action of alternating current.
  • the process according to the invention is then characterized in that the acidic aqueous electrolyte contains as the sole acid HCI or HN0 3 , optionally together with aluminum nitrate, and the roughening is carried out with an alternating current with a frequency of 0.3 to 15 Hz.
  • the frequency range is between 0.8 and 15 Hz, in particular between 1.5 and 10 Hz.
  • the shape of the alternating current - with a graphic representation of the course of the current density or voltage as a function of time - can for example be a rectangular, Trapezoidal or sinusoidal, the rectangular shape is preferred in the inventive method.
  • the process according to the invention is carried out either discontinuously or preferably continuously with strips made of aluminum or its alloys.
  • the process parameters in continuous processes during roughening are in the following ranges: the temperature of the electrolyte between 20 and 60 ° C, the electrolyte (acid and / or salt) concentration between 1 and 250 g, in particular between 5 and 100 g / I, the current density between 3 and 130 A / dm 2 , the residence time of a material point to be roughened in the electrolyte between 10 and 300 sec and the electrolyte flow rate at the surface of the material to be roughened between 5 and 100 cm / sec.
  • For anodic oxidation is preferably equal current, but alternating current or a combination of these types of current (e.g. direct current with superimposed alternating current) can also be used.
  • the layer weights of aluminum oxide range from 1 to 10 g / m 2 , corresponding to a layer thickness of approximately 0.3 to 3.0 ⁇ m.
  • a modification can also be applied which causes surface abrasion from the roughened surface, as described, for example, in DE-OS 30 09 103.
  • a modifying intermediate treatment can, among other things, enable the build-up of abrasion-resistant oxide layers and a lower tendency to tone in later prints.
  • the stage of anodic oxidation of the aluminum printing plate support material can also be followed by one or more post-treatment stages.
  • These post-treatment stages serve in particular to additionally increase the hydrophilicity of the aluminum oxide layer, which is already sufficient for many areas of application, the remaining known properties of this layer being at least retained.
  • Negative-working condensation products from aromatic diazonium salts and compounds with active carbonyl groups preferably condensation products from diphenylamine diazonium salts and formaldehyde, which are described, for example, in DE-PS 596 731, 1138399, 1138400, 1138401, 1142871, 1 154123, US-PS 2 679 498 and 3050502 GB-PS 712 606 are described.
  • Negative mixed condensation products of aromatic diazonium compounds for example according to DE-OS 20 24 244, which each have at least one unit of the general types A (-D) n and B connected by a double-bonded intermediate member derived from a condensable carbonyl compound.
  • A is the remainder of a compound containing at least two aromatic carbocyclic and / or heterocyclic nuclei, which is capable of condensing with an active carbonyl compound in an acidic medium at at least one position.
  • D is a diazonium salt group attached to an aromatic carbon atom of A; n is an integer from 1 to 10; and B is the remainder of a compound free of diazonium groups and capable of condensing with an active carbonyl compound in an acidic medium at at least one position on the molecule.
  • Positive-working layers according to DE-OS 26 10 842 which contain a compound which releases acid upon irradiation, a compound which has at least one C-O-C group which can be split off by acid (e.g. an orthocarboxylic acid ester group or a carboxylic acid amide acetal group) and optionally a binder.
  • acid e.g. an orthocarboxylic acid ester group or a carboxylic acid amide acetal group
  • optionally a binder optionally a binder.
  • Negative working layers of photopolymerizable monomers, photoinitiators, binders and optionally other additives are, for example, acrylic and methacrylic acid esters or reaction products of diisocyanates with partial esters of polyhydric alcohols, as described, for example, in US Pat. Nos. 2,760,863 and 3,060,023 and DE-OSes 20 64 079 and 23 61 041.
  • Suitable photoinitiators include benzoin, benzoin ether, multinuclear quinones, acridine derivatives, phenazine derivatives, Quinoxaline derivatives, quinazoline derivatives or synergistic mixtures of different ketones.
  • a large number of soluble organic polymers can be used as binders, for example polyamides, polyesters, alkyd resins, polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene oxide, gelatin or cellulose ethers.
  • Negative working layers according to DE-OS 30 36 077 which contain a diazonium salt polycondensation product or an organic azido compound as a photosensitive compound and a high molecular weight polymer with pendant alkenylsulfonyl or cycloalkenylsulfonylurethane groups as a binder.
  • photoconductive layers such as z. B. in DE-PS 11 17 391, 15 22 497, 1572312, 2322046 and 23 22 047 are described, are applied to the carrier materials, whereby highly light-sensitive, electrophotographic layers are formed.
  • the materials for printing plate supports roughened by the method according to the invention have a uniform topography, which has a positive influence on the support stability and the water flow during printing of printing forms made from these supports.
  • a uniform topography which has a positive influence on the support stability and the water flow during printing of printing forms made from these supports.
  • scars prominent indentations compared to the roughening of the surroundings
  • These surface properties can be achieved without great expenditure on equipment and without continuous qualitative and quantitative bath monitoring.
  • the surface of aluminum roughened by the method according to the invention is also significantly lighter than that of aluminum roughened at higher frequencies, so that a clearer contrast is possible during exposure and after development.
  • the positive influence on the topography may be due to an improved mass transfer at the phase boundary between aluminum and the electrolyte.
  • An aluminum sheet is first pickled for 60 seconds in an aqueous solution of 20 g NaOH per liter at room temperature and then freed from any alkali residues that may be present by briefly immersing it in a solution corresponding to the roughening electrolyte.
  • the roughening takes place either under galvanostatic or potentiostatic control in the specified electrolytes, the latter being saturated with the Ag / AgCI system as the reference electrode.
  • Examples 1 to 33 and V1 to V33 are galvanostatically (Table I) and Examples 34 to 37 and V34 to V37 (Table 11) controlled potentiostatically.

Claims (4)

1. Procédé pour le grainage électrochimique d'aluminium ou de ses alliages en forme de plaque, de feuille ou de bande, pour supports de plaques d'impression, sous l'effet d'un courant alternatif, dans un électrolyte aqueux, caractérisé en ce que l'électrolyte aqueux acide contient en tant que seul acide HCI ou HN03, éventuellement conjointement avec du nitrate d'aluminium, et le grainage est effectué avec un courant alternatif ayant une fréquence de 0,3 à 15 Hz.
2. Procédé selon la revendication 1, caractérisé en ce que l'on utilise un courant alternatif ayant une fréquence de 0,8 à 15 Hz.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'on utilise un courant alternatif ayant une fréquence de 1,5 à 10 Hz.
4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le courant alternatif présente une forme rectangulaire.
EP83104144A 1982-05-10 1983-04-28 Procédé de grainage électrochimique de l'aluminium pour des supports de plaques d'impression Expired EP0093960B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823217552 DE3217552A1 (de) 1982-05-10 1982-05-10 Verfahren zur elektrochemischen aufrauhung von aluminium fuer druckplattentraeger
DE3217552 1982-05-10

Publications (2)

Publication Number Publication Date
EP0093960A1 EP0093960A1 (fr) 1983-11-16
EP0093960B1 true EP0093960B1 (fr) 1987-07-15

Family

ID=6163207

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83104144A Expired EP0093960B1 (fr) 1982-05-10 1983-04-28 Procédé de grainage électrochimique de l'aluminium pour des supports de plaques d'impression

Country Status (8)

Country Link
US (1) US4482434A (fr)
EP (1) EP0093960B1 (fr)
JP (1) JPS58207400A (fr)
AU (1) AU550991B2 (fr)
BR (1) BR8302412A (fr)
CA (1) CA1225065A (fr)
DE (2) DE3217552A1 (fr)
ZA (1) ZA833132B (fr)

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JPH0620029B2 (ja) * 1984-08-30 1994-03-16 松下電器産業株式会社 アルミニウム電解コンデンサ用電極箔のエツチング方法
DE3533532A1 (de) * 1985-09-20 1987-04-02 Hoechst Ag Verfahren zur elektrochemischen aufrauhung von aluminium fuer druckplattentraeger
DE3717654A1 (de) * 1987-05-26 1988-12-08 Hoechst Ag Verfahren zur elektrochemischen aufrauhung von aluminium fuer druckplattentraeger
JPH01148592A (ja) * 1987-12-07 1989-06-09 Fuji Photo Film Co Ltd 印刷版用アルミニウム支持体の製造方法
JPH07119152B2 (ja) * 1987-12-18 1995-12-20 富士写真フイルム株式会社 平版印刷版用アルミニウム支持体の電解粗面化処理方法
JPH0798430B2 (ja) * 1988-03-31 1995-10-25 富士写真フイルム株式会社 印刷版用アルミニウム支持体の製造方法
JP2520694B2 (ja) * 1988-06-06 1996-07-31 富士写真フイルム株式会社 平版印刷版用支持体
US5152877A (en) * 1989-10-13 1992-10-06 Fuji Photo Film Co., Ltd. Method for producing support for printing plate
DE3934683A1 (de) * 1989-10-18 1991-04-25 Kurt Hausmann Verfahren und vorrichtung zur elektrochemischen aufrauhung einer metalloberflaeche
US5264110A (en) * 1990-03-06 1993-11-23 Dupont-Howson Ltd. Of Coal Road Electrolytic square wave graining
US5171416A (en) * 1990-10-10 1992-12-15 Space Systems/Loral, Inc. Method for making a battery cell electrode
JP2759388B2 (ja) * 1991-01-23 1998-05-28 富士写真フイルム株式会社 印刷版用支持体の製造方法
US5221442A (en) * 1991-03-07 1993-06-22 Fuji Photo Film Co., Ltd. Method and apparatus for electrolytic treatment
GB9112211D0 (en) * 1991-06-06 1991-07-24 Alcan Int Ltd Treating a1 sheet
KR100348378B1 (ko) * 1993-09-21 2002-11-29 알칸 인터내셔널 리미티드 롤링된알루미늄시이트,이를포함하는평판인쇄판지지체및이들의제조방법과상기평판인쇄판지지체를포함하는평판인쇄판
GB9326150D0 (en) * 1993-12-22 1994-02-23 Alcan Int Ltd Electrochemical roughening method
EP0689096B1 (fr) 1994-06-16 1999-09-22 Kodak Polychrome Graphics LLC Plaques d'impression lithographiques utilisant une couche oléophile à formation d'image
US20030032879A1 (en) * 1997-07-07 2003-02-13 Steven Quay Microbubble formation using ultrasound
JP2000017500A (ja) * 1998-06-26 2000-01-18 Fuji Photo Film Co Ltd 電解処理装置及び電解処理方法
US20030047464A1 (en) * 2001-07-27 2003-03-13 Applied Materials, Inc. Electrochemically roughened aluminum semiconductor processing apparatus surfaces
EP1826022B1 (fr) * 2006-02-28 2008-11-26 Agfa Graphics N.V. Procédé pour la production d'un support pour plaque d'impression lithographique
ES2430562T3 (es) * 2008-03-04 2013-11-21 Agfa Graphics N.V. Método para la fabricación de un soporte de una plancha de impresión litográfica
JPWO2018235659A1 (ja) 2017-06-21 2020-04-16 富士フイルム株式会社 アルミニウム複合材料

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US3330743A (en) * 1962-06-15 1967-07-11 Jestl Karl Process of manufacturing aluminumbase offset printing plates
US4166015A (en) * 1975-08-25 1979-08-28 Hoechst Aktiengesellschaft Process for the manufacture of aluminum supports for planographic printing plates by electrochemical roughening of the plate surfaces
US4211619A (en) * 1978-03-16 1980-07-08 Hoechst Aktiengesellschaft Process for anodically oxidizing aluminum and use of the material so prepared as a printing plate support
US4273625A (en) * 1979-08-28 1981-06-16 U.S. Philips Corporation Method of treating objects the surface of which consists of tin
US4297184A (en) * 1980-02-19 1981-10-27 United Chemi-Con, Inc. Method of etching aluminum

Also Published As

Publication number Publication date
BR8302412A (pt) 1984-01-10
JPH0553880B2 (fr) 1993-08-11
DE3217552A1 (de) 1983-11-10
ZA833132B (en) 1984-01-25
US4482434A (en) 1984-11-13
CA1225065A (fr) 1987-08-04
AU550991B2 (en) 1986-04-10
EP0093960A1 (fr) 1983-11-16
DE3372502D1 (en) 1987-08-20
AU1429983A (en) 1983-11-17
JPS58207400A (ja) 1983-12-02

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