EP0161608A1 - Procédé de post-traitement de couches d'oxyde d'aluminium avec des solutions aqueuses contenant des phosphoroxo-anions et leur utilisation pour la fabrication de supports pour plaques d'impression offset - Google Patents

Procédé de post-traitement de couches d'oxyde d'aluminium avec des solutions aqueuses contenant des phosphoroxo-anions et leur utilisation pour la fabrication de supports pour plaques d'impression offset Download PDF

Info

Publication number
EP0161608A1
EP0161608A1 EP85105492A EP85105492A EP0161608A1 EP 0161608 A1 EP0161608 A1 EP 0161608A1 EP 85105492 A EP85105492 A EP 85105492A EP 85105492 A EP85105492 A EP 85105492A EP 0161608 A1 EP0161608 A1 EP 0161608A1
Authority
EP
European Patent Office
Prior art keywords
acid
aqueous solution
layers
anions
aftertreatment
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.)
Granted
Application number
EP85105492A
Other languages
German (de)
English (en)
Other versions
EP0161608B1 (fr
Inventor
Ulrich Dr. Dipl.-Chem. Simon
Reiner Beutel
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
Publication of EP0161608A1 publication Critical patent/EP0161608A1/fr
Application granted granted Critical
Publication of EP0161608B1 publication Critical patent/EP0161608B1/fr
Expired legal-status Critical Current

Links

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
    • B41N3/038—Treatment with a chromium compound, a silicon compound, a phophorus compound or a compound of a metal of group IVB; Hydrophilic coatings obtained by hydrolysis of organometallic compounds
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/18—After-treatment, e.g. pore-sealing
    • C25D11/24—Chemical after-treatment
    • 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
    • Y10S205/00—Electrolysis: processes, compositions used therein, and methods of preparing the compositions
    • Y10S205/921—Electrolytic coating of printing member, other than selected area coating

Definitions

  • the invention relates to an aftertreatment process for roughened and anodically oxidized aluminum, in particular of support materials for offset printing plates with aqueous solutions containing phosphorus oxo anions.
  • Carrier materials for offset printing plates are provided either by the consumer directly or by the manufacturer of pre-coated printing plates on one or both sides with a radiation (light) sensitive layer (reproduction layer), with the help of which a printing image of a template is generated by photomechanical means.
  • the layer support carries the image points which will guide the color during later printing and at the same time forms the hydrophilic background for the lithographic printing process at the non-image points (non-image points) during later printing.
  • Aluminum is used in particular as the base material for such substrates. It is roughened according to known methods by dry brushing, wet brushing, sandblasting, chemical and / or electrochemical treatment. In order to increase the abrasion resistance, the roughened substrate can also be subjected to an anodization step to build up a thin oxide layer.
  • treatment with steam or hot water and after a customary anodic oxidation of the aluminum is also carried out by immersion in an aqueous solution containing either an acid (e.g. meta, pyro or polyphosphoric acid) or a base (e.g. Na 3 P0 4 or K 3 P0 4 ) contains.
  • an acid e.g. meta, pyro or polyphosphoric acid
  • a base e.g. Na 3 P0 4 or K 3 P0 4
  • stage b) phosphoric acid (H 3 P0 4 ), sodium dihydrogen phosphate (NaH 2 P0 4 ), disodium hydrogen phosphate (Na 2 HP0 4 ), trisodium phosphate (Na 3 P0 4 ), phosphorous acid (H 3 P0 3 ), disodium phosphite (Na 2 HP0 3 ), diphosphoric acid (H 4 P 2 0 7 ), sodium pyrophosphate (Na 4 P 2 0 7 ), triphosphoric acid (H 5 P 3 O 10 ), sodium triphosphate (Na 5 P 3 O 10 ), Polyphosphoric acid (H n + w P n O 3n + 1 ), hexasodium tetrapolyphosphate (Na 6 P 4 O 13 ), hexasodium metaphosphate [Na 6 (P0 3 ) 6 1, disodium monofluorophosphate (Na 2 P0 3 F) and potassium hexa
  • the object of the present invention is to propose a method for the aftertreatment of flat aluminum, which can be carried out in addition to anodic oxidation of the aluminum and leads to a surface on the aluminum oxide thus produced, which in particular meets the practical requirements of a high-performance printing plate described at the outset and already known dipping methods improved in effect.
  • the invention is based on the known process for the production of plate, film or strip-shaped materials based on chemically, mechanically and / or electrochemically roughened and anodically oxidized aluminum or one of its alloys, the aluminum oxide layers of which contain a phosphorus oxo anion tend aqueous solution are treated.
  • the process according to the invention is then characterized in that the aftertreatment of the aluminum oxide layers is carried out by immersion in an aqueous solution containing hexametaphosphate anions.
  • the aqueous solution generally contains 1 to 300 g / l of hexametaphosphate anions, preferably 3 to 150 g / l and in particular 5 to 100 g / l.
  • the aftertreatment is carried out non-electrolytically as immersion treatment, either discontinuously or preferably continuously in modern belt systems.
  • the treatment times are expediently in the range of 0.5 to 120 seconds and the treatment temperature at 15 to 80 * C, especially at 20 to 75 ° C.
  • the procedure used changes the previously created surface topography (such as roughness and oxide pores) practically not or only insignificantly, so that this is the case
  • the method according to the invention is particularly suitable for the treatment of materials in which the retention of this topography plays a major role, for example for printing plate support materials.
  • Suitable base materials for the material to be treated according to the invention include those made of aluminum or one of its alloys, which have, for example, a content of more than 98.5% by weight of Al and proportions of Si, Fe, Ti, Cu and Zn.
  • the flat aluminum if necessary after pre-cleaning, is first mechanically (e.g. by brushing and / or with abrasive treatment), chemically (e.g. by etching agent) and / or electrochemically (e.g. B. roughened by AC treatment in aqueous acid or salt solutions).
  • Electrochemical roughening is preferably carried out in the process according to the invention, but these aluminum support materials can also be roughened mechanically before the electrochemical stage (for example by brushing with wire or nylon brushes and / or with an abrasive treatment). All process steps can be carried out discontinuously with plates or foils, but they are preferably carried out continuously with tapes.
  • the process parameters are in the following areas: the temperature of the aqueous electrolyte, which generally contains 0.3 to 5.0% by weight of acid (s) (even higher in the case of salts), between 20 and 60 ° C., the current density between 3 and 200 A / dm 2 , the residence time a material point to be roughened in the electrolyte between 3 and 100 seconds and the electrolyte flow rate at the surface of the material to be roughened between 5 and 100 cm / sec; in the batchwise process, the required current densities tend to be in the lower part and the dwell times are in the upper part of the ranges specified, and the flow of the electrolyte can also be dispensed with.
  • alternating current of a frequency of 50 to 60 Hz is usually used as the type of current, but modified types of current such as alternating current with different amplitudes of the current strength for the anode and cathode current, lower frequencies, current interruptions or superimposition of two currents of different frequency and waveform are also possible.
  • the average roughness depth R of the roughened surface is in the range from 1 to 15 / um, in particular from 1.5 to 8.0 / um.
  • the aqueous electrolyte contains acid (s), in particular HCl and / or HN0 3 , aluminum ions in the form of aluminum salts, in particular Al (N0 3 ) 3 and / or AlC1 3 can also be added to it; the addition of certain other acids and salts such as boric acid or borates or of corrosion inhibitors such as amines is also known.
  • Pre-cleaning includes, for example, treatment with aqueous NaOH solution with or without degreasing agent and / or complexing agents, trichlorethylene, acetone, methanol or other commercially available aluminum stains.
  • the roughening or, in the case of several roughening stages, also between the individual stages, an abrasive treatment can additionally be carried out, in particular a maximum of 2 g / m 2 being removed (up to 5 g / m 2 between the stages);
  • aqueous solutions of alkali metal hydroxide or aqueous solutions of alkaline salts or aqueous acid solutions based on HN0 3 , H 2 SO 4 or H 3 PO 4 are used as abrasive solutions.
  • non-electrochemical treatments are also known which essentially only have a rinsing and / or cleaning effect and, for example, for removing deposits formed during roughening ("Schmant") or simply for Serve removal of electrolyte residues; For example, dilute aqueous alkali hydroxide solutions or water are used for these purposes.
  • anodic oxidation of the aluminum follows in a further process step, for example to improve the abrasion and adhesion properties of the surface of the carrier material.
  • the usual electrolytes such as H Z S0 4 , H 3 P0 4 , H 2 C 2 0 4 , amidosulfonic acid, sulfosuccinic acid, sulfosa can be used for anodic oxidation licylic acid or mixtures thereof are used; in particular, H 2 S0 4 and H 3 P0 4 are used alone, in a mixture and / or in a multi-stage anodizing process; an aqueous H 2 S0 4 and A, 3 + is particularly preferred - ion-containing solution used.
  • the oxide layer weights are generally in particular between 1 and 8 g / m 2 (corresponding to about 0.3 to 2.5 / ⁇ m layer thickness).
  • the materials produced according to the invention are preferably used as supports for offset printing plates, i. H. a radiation-sensitive coating is applied to one or both sides of the carrier material either by the manufacturer of presensitized printing plates or directly by the consumer.
  • a radiation-sensitive coating is applied to one or both sides of the carrier material either by the manufacturer of presensitized printing plates or directly by the consumer.
  • all layers are suitable as radiation (light) sensitive layers which, after irradiation (exposure), optionally with subsequent development and / or fixation, provide an imagewise surface from which printing can take place.
  • photo-semiconducting layers such as e.g. in DE-C 11 17 391, 15 22 497, 15 72 312, 23 22 046 and 23 22 047 are described, are applied to the carrier materials produced according to the invention, thereby producing highly light-sensitive, electrophotographic printing plates.
  • coated offset printing plates obtained from the carrier materials produced according to the invention are converted into the desired printing form in a known manner by imagewise exposure or irradiation and washing out of the non-image areas with a developer, preferably an aqueous developer solution.
  • offset printing plates the base carrier materials of which have been post-treated by the two-stage process according to the invention, are distinguished from those plates in which the same base material is used other aqueous solutions containing phosphorus oxo anions were aftertreated, in particular by a lower tendency to form color fog (see subsequent comparative experiments).
  • This special effect of the hexametaphosphate anions in a pure immersion treatment was not foreseeable, since the whole group of anions shows a similar effect in the electrochemical treatment.
  • An aluminum strip is electrochemically roughened in an aqueous solution containing 1.4% of HN0 3 and 6% of Al (N0 3 ) 3 using alternating current (115 A / dm 2 at 35 ° C.) and in an aqueous H 2 S0 4 and Solution containing A1 3 + ions anodized with direct current.
  • the oxide layer which has a layer weight of approximately 2.5 g / m 2 , is converted into a layer at a temperature of 45 to 50 ° C. for 15 seconds
  • Example 1 The procedure of Example 1 is followed, but roughened in an aqueous solution containing 0.9% of HCl.
  • Example 1 The procedure of Example 1 is followed, but the Na 6 P 6 0 18 solution additionally contains 10 g / 1 of citric acid and thus a pH of 2.5.
  • Example 2 The procedure of Example 2 is followed, but the Na 6 P 6 0 18 solution additionally contains 10 g / 1 of citric acid and thus a pH of 2.5.
  • Example 1 V5 to V12
  • Example 2 V13 to V20
  • other compounds which likewise give phosphorus oxo anions as shown in the table, or no aftertreatment is carried out. It is shown that with both common types of electrochemical roughening with hexasodium hexametaphosphate there is a more pronounced reduction in dye adsorption than with other salts or acids which provide phosphorus oxo anions.
  • the effect is affected by a change in pH, e.g. B. with the addition of citric acid, significantly increased again; it also occurs with the addition of other, not too strong acids, in the pH range from 1 to 5 in a similar order of magnitude.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP85105492A 1984-05-16 1985-05-06 Procédé de post-traitement de couches d'oxyde d'aluminium avec des solutions aqueuses contenant des phosphoroxo-anions et leur utilisation pour la fabrication de supports pour plaques d'impression offset Expired EP0161608B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843418111 DE3418111A1 (de) 1984-05-16 1984-05-16 Verfahren zur nachbehandlung von aluminiumoxidschichten mit phosphoroxo-anionen enthaltenden waessrigen loesungen und deren verwendung bei der herstellung von offsetdruckplattentraegern
DE3418111 1984-05-16

Publications (2)

Publication Number Publication Date
EP0161608A1 true EP0161608A1 (fr) 1985-11-21
EP0161608B1 EP0161608B1 (fr) 1987-08-12

Family

ID=6235962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85105492A Expired EP0161608B1 (fr) 1984-05-16 1985-05-06 Procédé de post-traitement de couches d'oxyde d'aluminium avec des solutions aqueuses contenant des phosphoroxo-anions et leur utilisation pour la fabrication de supports pour plaques d'impression offset

Country Status (7)

Country Link
US (1) US4650739A (fr)
EP (1) EP0161608B1 (fr)
JP (1) JPS60253597A (fr)
BR (1) BR8502292A (fr)
CA (1) CA1271958A (fr)
DE (2) DE3418111A1 (fr)
ZA (1) ZA853680B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1013469A1 (fr) * 1998-12-22 2000-06-28 Fuji Photo Film Co., Ltd. Procédé pour la préparation d'une plaque d'impression lithographique photosensible

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07119151B2 (ja) * 1987-12-07 1995-12-20 富士写真フイルム株式会社 平版印刷版用支持体
US5230988A (en) * 1991-03-12 1993-07-27 Fuji Photo Film Co., Ltd. Method of making lithographic printing plate
JP4868020B2 (ja) * 2008-12-26 2012-02-01 株式会社デンソー アルミニウムの陽極酸化方法、および陽極酸化アルミニウム

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1961182A1 (de) * 1968-12-06 1970-07-09 Alusuisse Offsetdruckplatte
AT316251B (de) * 1971-12-17 1974-07-10 Henkel & Cie Gmbh Verfahren zur Behandlung von Aluminiumoberflächen durch Oxydation mit einer nachfolgenden Verdichtung
DE2609577A1 (de) * 1975-03-06 1976-09-09 Yoshida Kogyo Kk Verfahren zur erzeugung versiegelter anodischer oxidduennschichten auf aluminium und aluminiumlegierungen vor deren beschichtung
EP0086957A1 (fr) * 1982-02-23 1983-08-31 Hoechst Aktiengesellschaft Procédé pour la production de matériaux de support pour des plaques d'impression offset

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL134368C (fr) * 1961-01-25
NL136528C (fr) * 1962-04-03
US3373021A (en) * 1964-01-29 1968-03-12 Harris Intertype Corp Presensitized positive working lithographic plate
US3511661A (en) * 1966-07-01 1970-05-12 Eastman Kodak Co Lithographic printing plate
ZA6807938B (fr) * 1967-12-04
US3679419A (en) * 1969-05-20 1972-07-25 Azoplate Corp Light-sensitive diazo condensate containing reproduction material
GB1410768A (en) * 1971-10-22 1975-10-22 Vickers Ltd Lithographic printing plates comprising anodised aluminium
US3808000A (en) * 1972-03-28 1974-04-30 Grace W R & Co Printing plate and method of preparation
CA1011279A (en) * 1972-07-27 1977-05-31 Yoshiaki Miyosawa Method of after-treatment for lithographic printing plates
US4116695A (en) * 1974-09-12 1978-09-26 Fuji Photo Film Co., Ltd. Method of producing a support for a printing plate
JPS52150104A (en) * 1976-06-07 1977-12-13 Fuji Photo Film Co Ltd Photoosensitive lithographic press plate material
DE3006094A1 (de) * 1980-02-19 1981-08-20 Hoechst Ag, 6000 Frankfurt Verfahren zum konservieren von flachdruckformen
DE3126636A1 (de) * 1981-07-06 1983-01-27 Hoechst Ag, 6000 Frankfurt Hydrophilierte traegermaterialien fuer offsetdruckplatten, ein verfahren zu ihrer herstellung und ihre verwendung
US4414311A (en) * 1982-03-18 1983-11-08 American Hoechst Corporation Cathodic deposition of light sensitive components
JPS58193194A (ja) * 1982-05-06 1983-11-10 Fuji Photo Film Co Ltd 平版印刷版用版画保護剤
JPS59214651A (ja) * 1983-05-20 1984-12-04 Fuji Photo Film Co Ltd 感光性平版印刷版を用いた製版方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1961182A1 (de) * 1968-12-06 1970-07-09 Alusuisse Offsetdruckplatte
AT316251B (de) * 1971-12-17 1974-07-10 Henkel & Cie Gmbh Verfahren zur Behandlung von Aluminiumoberflächen durch Oxydation mit einer nachfolgenden Verdichtung
DE2609577A1 (de) * 1975-03-06 1976-09-09 Yoshida Kogyo Kk Verfahren zur erzeugung versiegelter anodischer oxidduennschichten auf aluminium und aluminiumlegierungen vor deren beschichtung
EP0086957A1 (fr) * 1982-02-23 1983-08-31 Hoechst Aktiengesellschaft Procédé pour la production de matériaux de support pour des plaques d'impression offset

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, unexamined applications, C Field, No. 149, 10. August 1982, vol. 6 THE PATENT OFFICE JAPANESE GOVERNMENT Seite 107 C 118 * JP - A - 57-70 292 ( TOUYOU KOUHAN K.K. ) * *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1013469A1 (fr) * 1998-12-22 2000-06-28 Fuji Photo Film Co., Ltd. Procédé pour la préparation d'une plaque d'impression lithographique photosensible

Also Published As

Publication number Publication date
DE3560465D1 (en) 1987-09-17
EP0161608B1 (fr) 1987-08-12
DE3418111A1 (de) 1985-11-21
BR8502292A (pt) 1986-01-21
JPH0545437B2 (fr) 1993-07-09
ZA853680B (en) 1985-12-24
JPS60253597A (ja) 1985-12-14
CA1271958A (fr) 1990-07-24
US4650739A (en) 1987-03-17

Similar Documents

Publication Publication Date Title
EP0154200B1 (fr) Procédé pour le traitement postérieur hydrophilisant en deux étapes de couches d'oxyde d'aluminium avec solutions aqueuses et leur utilisation pour la fabrication de supports pour plaques d'impression offset
EP0121880B1 (fr) Procédé en deux pas pour la préparation de matériaux anodisés d'aluminium en forme plane et leur utilisation dans la fabrication de planches à imprimer offset
EP0105170B1 (fr) Procédé de posttraitement de couches d'oxyde d'aluminium avec des solutions aqueuses contenant du silicate alcalin et son application dans la fabrication des supports pour plaques d'impression
EP0008440B1 (fr) Procédé d'oxydation anodique d'aluminium et son application comme support de plaque d'impression
EP0093960B1 (fr) Procédé de grainage électrochimique de l'aluminium pour des supports de plaques d'impression
EP0069320A1 (fr) Matériaux de support pour plaques lithographiques, aux propriétés hydrophiles améliorées, procédés pour leur fabrication, et leur utilisation
DE4001466A1 (de) Verfahren zur elektrochemischen aufrauhung von aluminium fuer druckplattentraeger
EP0069319A1 (fr) Matériaux de support pour plaques lithographiques, aux propriétés hydrophiles améliorées, procédés pour leur fabrication, et leur utilisation
EP0162283A2 (fr) Procédé de grainage électrochimique d'aluminium pour supports de plaques d'impression dans un électrolyte composite aqueux
DE3305067A1 (de) Platten-, folien- oder bandfoermiges material aus mechanisch und elektrochemisch aufgerauhtem aluminium, ein verfahren zu seiner herstellung und seine verwendung als traeger fuer offsetdruckplatten
DE3635303A1 (de) Verfahren zur abtragenden modifizierung von mehrstufig aufgerauhten traegermaterialien aus aluminium oder dessen legierungen und deren verwendung bei der herstellung von offsetdruckplatten
EP0093961B1 (fr) Procédé de grainage électrochimique de l'aluminium pour des supports de plaques d'impression
EP0086957B1 (fr) Procédé pour la production de matériaux de support pour des plaques d'impression offset
EP0139111B1 (fr) Procédé d'oxidation anodique en deux étapes des matériaux de support en aluminium pour plaques d'impression offset
EP0086956B1 (fr) Procédé pour la production de matériaux de support pour des plaques d'impression offset
EP0141056B1 (fr) Procédé d'oxydation anodique en une étape des matériaux supports en aluminium pour plaques d'impression offset
EP0150464A2 (fr) Procédé pour rendre rugueux électrolytiquement des plaques d'impression en aluminium dans un électrolyte composite aqueux
EP0269851B1 (fr) Support en aluminium ou en alliage d'aluminium pour des plaques offset et son procédé de fabrication
EP0161608B1 (fr) Procédé de post-traitement de couches d'oxyde d'aluminium avec des solutions aqueuses contenant des phosphoroxo-anions et leur utilisation pour la fabrication de supports pour plaques d'impression offset
EP0161461B1 (fr) Procédé d'oxydation anodique d'aluminium et son application comme matériau de support pour plaques d'impression offset
EP0190643A2 (fr) Matériau de supports hydrophilisés pour plaques d'impression offset, procédé de fabrication et leur emploi
EP0154201B1 (fr) Procédé pour le traitement postérieur de couches d'oxyde d'aluminium avec solutions aqueuses contenant du silicate de métal alcalin et leur utilisation pour la fabrication de supports pour plaques d'impression offset
EP0095581B1 (fr) Procédé de post traitement de couches d'oxyde d'aluminium avec des solutions aqueuses contenant silicate alcalin et son application dans la fabrication de supports de plaques d'impression offset
EP0170045A1 (fr) Procédé pour le décapage et le chromage simultanés de plaques d'acier comme supports pour des utilisations lithographiques
EP0268058B1 (fr) Procédé de décapage électrochimique de l'aluminium ou ses alliages pour supports pour plaques d'impression

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB IT NL

17P Request for examination filed

Effective date: 19860122

17Q First examination report despatched

Effective date: 19870129

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT NL

REF Corresponds to:

Ref document number: 3560465

Country of ref document: DE

Date of ref document: 19870917

ET Fr: translation filed
ITF It: translation for a ep patent filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19930416

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19930422

Year of fee payment: 9

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19930531

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19930716

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19940506

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19941201

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19940506

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19950131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19950201

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST