EP0963841B1 - Méthode de fabrication de plaques d'impression travaillant en positif à partir d'un latex - Google Patents

Méthode de fabrication de plaques d'impression travaillant en positif à partir d'un latex Download PDF

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Publication number
EP0963841B1
EP0963841B1 EP19990201313 EP99201313A EP0963841B1 EP 0963841 B1 EP0963841 B1 EP 0963841B1 EP 19990201313 EP19990201313 EP 19990201313 EP 99201313 A EP99201313 A EP 99201313A EP 0963841 B1 EP0963841 B1 EP 0963841B1
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EP
European Patent Office
Prior art keywords
hydrophobic polymer
printing
ink
latex
lithographic
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
EP19990201313
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German (de)
English (en)
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EP0963841A1 (fr
Inventor
Leo Oelbrandt
Huub Van Aert
Luc Leenders
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.)
Agfa Gevaert NV
Original Assignee
Agfa Gevaert NV
Agfa Gevaert AG
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Publication date
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Priority to EP19990201313 priority Critical patent/EP0963841B1/fr
Publication of EP0963841A1 publication Critical patent/EP0963841A1/fr
Application granted granted Critical
Publication of EP0963841B1 publication Critical patent/EP0963841B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/36—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its' properties, e.g. of its' optical hydrophobic-hydrophilic, solubility or permeability properties
    • B41M5/368—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its' properties, e.g. of its' optical hydrophobic-hydrophilic, solubility or permeability properties involving the creation of a soluble/insoluble or hydrophilic/hydrophobic permeability pattern; Peel development
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1041—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by modification of the lithographic properties without removal or addition of material, e.g. by the mere generation of a lithographic pattern
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme

Definitions

  • the present invention relates to methods for making lithographic printing plates.
  • it relates to a method for directly making the lithographic printing plates by using hydrophobic polymer latex printing, which makes it possible to produce the lithographic plates directly from digital data output from computers, facsimiles, or the like without using any films having negative or positive images.
  • the direct plate-making method a method wherein an image or non-image portion is directly formed on a substrate by ink-jet printing is known to the art.
  • the ink-jet printing system is a relatively rapid image output system and has a simple construction because it does not require any complex optical system. Therefore, the printing system makes an apparatus for making printing plates simple and the cost for making printing plates can be reduced since the maintenance labor is largely reduced.
  • Japanese Kokai Publication 113456/1981 proposes the methods for preparing printing plates wherein ink-repelling materials (e.g. curable silicone) are printed on a printing plate by ink-jet printing.
  • the printing plate obtained by this method is an intaglio printing plate in which the ink-repelling material formed on the surface of the substrate serves as a non-image part.
  • the resolution of the printed images at shadow area or reversed lines is not so good.
  • a large amount of ink is needed in this method because the ink-repelling material must be deposited on the whole non-image part which occupies most of the surface of the printing plate, thereby delaying the printing process.
  • US-P- 5 511 477 discloses a method for the production of photopolymeric relief-type printing plates comprising: forming a positive or a negative image on a substrate by ink-jet printing with a photopolymeric ink composition, optionally preheated to a temperature of about 30°-260°C; and subjecting the resulting printed substrate to UV radiation, thereby curing said ink composition forming said image.
  • This is an obnoxious method due to the sometimes high vapour pressure and toxicity of said inks.
  • US-P- 5 312 654 discloses a method for making lithographic printing plates comprising: forming an image on a substrate having an ink absorbing layer and a hydrophilized layer between the substrate and absorbing layer by ink-jet printing using a photopolymerizable ink composition, and exposing it to an active light in the wavelength region with which said ink composition is sensitized to cure the image.
  • the printing endurance of said printing plates is low.
  • Japanese Kokai Publication 69244/1992 discloses a method for making printing plates comprising the steps of forming a printed image on a recording material subjected to a hydrophilic treatment by ink-jet printing using a hydrophobic ink containing photocurable components; and exposing the whole surface to an active light.
  • the surface of the substrate to be used for the lithographic plate is usually subjected to various treatments such as a mechanical graining, an anodizing or a hydrophilic treatment to obtain good hydrophilic property and water retention property. Therefore, even the use of an ink composition having a very high surface tension results in a poor image on the surface of the substrate because of ink spreading and low printing endurance.
  • EP-A- 533 168 discloses a method for avoiding said ink spreading by coating the lithographic base with an ink absorbing layer which is removed after ink printing. This is an uneconomical and cumbersome method.
  • Research Disclosure 289118 of May 1988 discloses a method for making printing plates with the use of an ink jet wherein the ink is a hydrophobic polymer latex.
  • said printing plates have a bad ink acceptance and a low printing endurance.
  • EP-A- 003 789 discloses a process for the preparation of offset printing plates by means of an ink jet methodwith oleophilic inks. There is not indicated how said inks are made but from the examples it is clear that it concerns artificial latices, which are difficult to prepare.
  • JN- 57/038142 discloses a method of preparing a printing plate by forming an ink image on a blank printing plate, and also by fixing this image thermally by making toner adheres to this image-formed area.
  • the composition of the ink is not mentioned, only the composition of the toners is disclosed.
  • JN- 07/108667 discloses a plate-making method forming an ink image containing a hydrophilic substance on a conductive support whose surface layer is made hydrophilic according to an electrostatic attraction type ink set system to dry or cure the same, by applying bias voltage to the conductive support at the time of ink jet writing. This is a cumbersome process.
  • US-P- 5 213 041 discloses a method for preparing a re-usable printing plate for printing, projecting an imaging deposit on the plate surface by jet printing using an ejectable substance containing a heat fusible component. The image forms an imaging deposit which is fused to the surface of the printing plate using a variable frequency and variable power induction heater. This patent is silent about latices.
  • a method for making a lithographic printing plate comprising the steps of dispensing in a predetermined pattern a synthetic latex of particles of a hydrophobic polymer onto a hydrophilic surface of a lithographic base and heating said lithographic base to at least the glass transition temperature (Tg) of the hydrophobic polymer.
  • the lithographic base with a hydrophilic surface is heated after spraying said hydrophilic surface with droplets of the hydrophobic polymer synthetic latex in the predetermined pattern at a temperature preferably at least 5°C, more preferably at least 10°C higher than the Tg of said hydrophobic polymer.
  • said heating is carried out in an oven.
  • the lithographic base having a hydrophilic surface after being sprayed with droplets of the hydrophobic polymer synthetic latex in the predetermined pattern is heated preferably for at least one minute, more preferably for at least 5 minutes above the Tg of the hydrophobic polymer.
  • said heating is carried out by contacting to a hot body.
  • said heating is carried out with an IR-heater or laser.
  • the time of heating is then the time of the laser dwell time, i.e. from 0.005 to 2 ⁇ s.
  • This mode of heating requires that the lithographic base or the synthetic latex comprises a compound capable of converting laser-light to heat.
  • an infrared pigment or dye for that purpose.
  • Particularly desirable in this invention is an infrared dye.
  • pigments can be used as well such as e.g.carbon black, a conductive polymer particle, metal carbides, borides, nitrides, carbonitrides, bronze-structured oxides and oxides structurally related to the bronze family but lacking the A component e.g. WO2.9.
  • the lithographic base may be an anodised aluminum support.
  • a particularly preferred lithographic base is an electrochemically grained and anodised aluminum support.
  • the anodised aluminum support may be treated to improve the hydrophilic properties of its surface.
  • the aluminum support may be silicated by treating its surface with sodium silicate solution at elevated temperature, e.g. 95°C.
  • a phosphate treatment may be applied which involves treating the aluminum oxide surface with a phosphate solution that may further contain an inorganic fluoride.
  • the aluminum oxide surface may be rinsed with a citric acid or citrate solution. This treatment may be carried out at room temperature or may be carried out at a slightly elevated temperature of about 30 to 50°C.
  • a further interesting treatment involves rinsing the aluminum oxide surface with a bicarbonate solution.
  • the aluminum oxide surface may be treated with polyvinylphosphonic acid, polyvinylmethylphosphonic acid, phosphoric acid esters of polyvinyl alcohol, polyvinylsulphonic acid, polyvinylbenzenesulphonic acid, sulphuric acid esters of polyvinyl alcohol, and acetals of polyvinyl alcohols formed by reaction with a sulphonated aliphatic aldehyde It is further evident that one or more of these post treatments may be carried out alone or in combination.
  • the lithographic base with a hydrophilic surface comprises a flexible support, such as e.g. paper or plastic film, provided with a cross-linked hydrophilic layer.
  • a particularly suitable cross-linked hydrophilic layer may be obtained from a hydrophilic binder cross-linked with a cross-linking agent such as formaldehyde, glyoxal, polyisocyanate or a hydrolysed tetra-alkylorthosilicate. The latter is particularly preferred.
  • hydrophilic binder there may be used hydrophilic (co)polymers such as for example, homopolymers and copolymers of vinyl alcohol, acrylamide, methylol acrylamide, methylol methacrylamide, acrylate acid, methacrylate acid, hydroxyethyl acrylate, hydroxyethyl methacrylate or maleic anhydride/vinylmethylether copolymers.
  • the hydrophilicity of the (co)polymer or (co)polymer mixture used is preferably the same as or higher than the hydrophilicity of polyvinyl acetate hydrolyzed to at least an extent of 60 percent by weight, preferably 80 percent by weight.
  • the amount of crosslinking agent, in particular of tetraalkyl orthosilicate, is preferably at least 0.2 parts by weight per part by weight of hydrophilic binder, more preferably between 0.5 and 5 parts by weight, most preferably between 1.0 parts by weight and 3 parts by weight.
  • a cross-linked hydrophilic layer in a lithographic base used in accordance with the present embodiment preferably also contains substances that increase the mechanical strength and the porosity of the layer.
  • colloidal silica may be used.
  • the colloidal silica employed may be in the form of any commercially available water-dispersion of colloidal silica for example having an average particle size up to 40 nm, e.g. 20 nm.
  • inert particles of larger size than the colloidal silica may be added e.g. silica prepared according to Stöber as described in J. Colloid and Interface Sci., Vol.
  • alumina particles or particles having an average diameter of at least 100 nm which are particles of titanium dioxide or other heavy metal oxides.
  • the thickness of a cross-linked hydrophilic layer in a lithographic base in accordance with this embodiment may vary in the range of 0.2 to 25 ⁇ m and is preferably 1 to 10 ⁇ m.
  • plastic film e.g. substrated polyethylene terephthalate film, substrated polyethylene naphthalate film, cellulose acetate film, polystyrene film, polycarbonate film etc.
  • the plastic film support may be opaque or transparent.
  • glass with a thickness less than 1.2 mm and a failure stress (under tensile stress) equal or higher than 5 x 10 7 .
  • the amount of silica in the adhesion improving layer is between 200 mg per m 2 and 750 mg per m 2 .
  • the ratio of silica to hydrophilic binder is preferably more than 1 and the surface area of the colloidal silica is preferably at least 300 m 2 per gram, more preferably at least 500 m 2 per gram.
  • a latex is defined as a stable colloidal dispersion of a polymeric substance in an aqueous medium.
  • the polymer particles are usually approximately spherical and of typical colloidal dimensions: particle diameters range from about 20 to 1000 nm.
  • the dispersion medium is usually a dilute aqueous solution containing substances such as electrolytes, surfactants, hydrophilic polymers and initiator residues.
  • the polymer latices are classified in various way. By origin, they are classified as natural latices, produced by metabolic processes occuring in the cells of certain plant species; synthetic latices, produced by emulsion polymerization of monomers; and artificial latices, produced by dispersing a polymer in a dispersing medium.
  • a hydrophobic polymer for use in the present invention has preferably a Tg below 150°C, more preferably a Tg below 120°C.
  • a hydrophobic polymer for use in the present invention has preferably a Tg of at least 30°C, more preferably a Tg of at least 35°C.
  • the hydrophobic polymer synthetic latex for use in the present invention may contain conventional emulsifiers.
  • Hydrophobic polymers for use in synthetic latices according to the present invention are, for example, polystyrene, polyacrylates such as polymethyl methacrylate and polybutyl acrylate, copolymers of butyl acrylate and methyl methacrylate, copolymers of butyl acrylate and styrene, homopolymers of butadiene, copolymers of butadiene and methyl methacrylate.
  • lithographic plate colored hydrophobic polymer synthetic latices can be used.
  • carbon black or dyes or pigments can be mixed with one of the above mentioned homopolymers or copolymers.
  • polymer particles containing color structures in the repeating units in particular colored polymer particles which have obtained their color by means of a chemical reaction based on oxidative coupling of a color coupling group in the polymer structure of the particles with an aromatic primary amino compound, as described in Japanese Kokai 59/30873 can be used as colored hydrophobic polymer latex.
  • the hydrophobic polymer synthetic latex particles have preferably a particle size between 0.01 and 1 ⁇ m, more preferably between 0.01 ⁇ m and 0.25 ⁇ m.
  • the latex can contain from 1 to 60 % by weight of hydrophobic polymer, more preferably from 2 to 40 % by weight of hydrophobic polymer, most preferably from 5 to 20 % by weight of hydrophobic polymer.
  • the latex can be dispensed onto the lithographic base having a hydrophilic surface preferably by an ink jet printer.
  • a volatilization preventive agent is added to the latex according to the present invention, if necessary, to suppress evaporation of the liquid in the ink-jet nozzle and to prevent clogging due to precipitation of the dissolved or dispersed components.
  • a surfactant is preferably added to the the latex used according to the present invention to adjust the size of droplets of the latex blowing out from the ink jet nozzle, to adjust the surface tension of the latex so that images can be formed in high resolution.
  • heat polymerisation inhibitors can be also added.
  • desinfectants can be also added.
  • buffers and solubilizers is effective to improve the solubility or dispersibility of the polymer.
  • Addition of defoaming agents and foam suppressing agents are also possible to suppress foaming of the latex in the ink-jet nozzle.
  • the image forming requires the following steps. On demand, microdots of the hydrophobic polymer latex are sprayed onto the lithographic base in a predetermined pattern as the plate passes through the printer or by a printhead shutteling over the plate. According to one embodiment of the invention, the microdots have a diameter of about 50 ⁇ m.
  • the lithographic base sprayed with hydrophobic polymer synthetic latex is heated to at least the Tg. This can be done by irradiation, by convection or by contact with a hot surface e.g.in an oven, by flash exposure, by IR-heaters or by laser irradiation.
  • the image forming can also be carried out with the lithographic base already on the printing cylinder.
  • the heating of the polymer to a temperature at least equal to the Tg of said polymer can be effected by using a heated printing cylinder.
  • the printing plate of the present invention can also be used in the printing process as a seamless sleeve printing plate.
  • This cylindrical printing plate has such a diameter that it can be slided on the print cylinder. More details on sleeves are given in "Grafisch Nieuws" ed. Keesing, 15, 1995, page 4 to 6.
  • a 0.30 mm thick aluminum foil was degreased by immersing the foil in an aqueous solution containing 5 g/l of sodium hydroxide at 50°C and rinsed with demineralized water.
  • the foil was then electrochemically grained using an alternating current in an aqueous solution containing 4 g/l of hydrochloric acid, 4 g/l of hydroboric acid and 5 g/l of aluminum ions at a temperature of 35°C and a current density of 1200 A/m 2 to form a surface topography with an average center-line roughness Ra of 0.5 ⁇ m.
  • the aluminum foil was then etched with an aqueous solution containing 300 g/l of sulfuric acid at 60°C for 180 seconds and rinsed with demineralized water at 25°C for 30 seconds.
  • the foil was subsequently subjected to anodic oxidation in an aqueous solution containing 200 g/l of sulfuric acid at a temperature of 45°C, a voltage of about 10 V and a current density of 150 A/m 2 for about 300 seconds to form an anodic oxidation film of 3.00 g/m 2 of Al 2 O 3 then washed with demineralized water, posttreated with a solution containing polyvinylphosphonic acid and subsequently with a solution containing aluminum trichloride, rinsed with demineralized water at 20°C during 120 seconds and dried.
  • KIESELSOL 300 F (tradename for 30 % aqueous dispersion of colloidal silica - surface area of 300 m 2 per g).
  • Anionic wetting agents ( 0.6 g ) and biocides (1 g ) were added.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Claims (10)

  1. Procédé de préparation d'un cliché d'impression lithographique comprenant les étapes consistant à distribuer, selon un modèle prédéterminé, un latex synthétique de particules d'un polymère hydrophobe sur une surface hydrophile d'une base lithographique et à chauffer ladite base lithographique jusqu'à au moins la température de transition vitreuse (Tg) du polymère hydrophobe.
  2. Procédé selon la revendication 1, dans lequel ledit chauffage est réalisé à une température d'au moins 5 °C supérieure à la Tg du polymère hydrophobe.
  3. Procédé selon la revendication 1 ou 2, dans lequel ledit latex synthétique du polymère hydrophobe contient un polymère hydrophobe à concurrence de 1 à 60 % en poids.
  4. Procédé selon l'une quelconque des revendications 1 à 3, dans lequel lesdites particules de latex synthétique du polymère hydrophobe possèdent une granulométrie de 0,01 µm à 1 µm.
  5. Procédé selon l'une quelconque des revendications 1 à 4, dans lequel le polymère hydrophobe possède une Tg inférieure à 150 °C.
  6. Procédé selon l'une quelconque des revendications 1 à 5, dans lequel la base lithographique possédant une surface hydrophile et un support en aluminium anodisé ou un support flexible muni d'une couche hydrophile réticulée.
  7. Procédé selon l'une quelconque des revendications 1 à 6, dans lequel ledit latex synthétique contient un colorant ou un pigment.
  8. Procédé selon l'une quelconque des revendications 1 à 7, dans lequel le latex synthétique comprend un monomère choisi parmi le groupe constitué par le styrène, l'acrylate de butyle, le méthacrylate de méthyle et le butadiène.
  9. Procédé selon l'une quelconque des revendications 1 à 8, dans lequel on effectue ledit chauffage par exposition à un rayonnement, par confection ou par contact avec une surface chauffée.
  10. Procédé selon l'une quelconque des revendications 1 à 9, comprenant les étapes consistant à monter une base lithographique possédant une surface hydrophile sur un cylindre d'impression d'une presse d'impression, à distribuer, selon un modèle prédéterminé, un latex synthétique de particules d'un polymère hydrophobe sur une surface hydrophile d'une base lithographique et à chauffer ladite base lithographique jusqu'à au moins la température de transition vitreuse (Tg) du polymère hydrophobe.
EP19990201313 1998-06-12 1999-04-27 Méthode de fabrication de plaques d'impression travaillant en positif à partir d'un latex Expired - Lifetime EP0963841B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19990201313 EP0963841B1 (fr) 1998-06-12 1999-04-27 Méthode de fabrication de plaques d'impression travaillant en positif à partir d'un latex

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP98201999 1998-06-12
EP98201999 1998-06-12
EP19990201313 EP0963841B1 (fr) 1998-06-12 1999-04-27 Méthode de fabrication de plaques d'impression travaillant en positif à partir d'un latex

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EP0963841A1 EP0963841A1 (fr) 1999-12-15
EP0963841B1 true EP0963841B1 (fr) 2003-05-28

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9828153D0 (en) * 1998-12-22 1999-02-17 Eastman Kodak Co Method of preparing a printing plate
IL132789A0 (en) * 1999-11-07 2001-03-19 Aprion Digital Ltd A fluid for preparation of printing plates and method for use of same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1352215A (fr) * 1962-12-28 1964-02-14 Procédé de fabrication de clichés, installation pour la mise en oeuvre de ce procédé, et clichés obtenus
DE1251774B (fr) * 1964-10-02
DE2806802A1 (de) * 1978-02-17 1979-08-23 Hoechst Ag Verfahren zum herstellen von offsetdruckplatten
JPS5738142A (en) * 1980-08-20 1982-03-02 Konishiroku Photo Ind Co Ltd Manufacture of plate for printing
US5213041A (en) * 1991-06-28 1993-05-25 Man Roland Druckmaschinen Ag Method and system for fusing printing image deposits on surfaces of a printing substrate, and removal thereof for re-use of the surface
JPH07108667A (ja) * 1993-10-13 1995-04-25 Konica Corp 平版印刷版の製版方法
JP3515836B2 (ja) * 1995-08-29 2004-04-05 株式会社きもと 平版印刷用版材及びこれを用いた平版印刷版の製版方法
DE69519100T2 (de) * 1995-11-16 2001-05-10 Agfa Gevaert Nv Verfahren zur Herstellung einer Flachdruckplatte durch bildmässige Erwärmung eines Bildaufnahmeelements mittels eines Thermodruckkopfes

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