EP0960730B1 - Elément formateur d'images sensible à la chaleur pour la fabrication de plaques d'impression lithographiques - Google Patents

Elément formateur d'images sensible à la chaleur pour la fabrication de plaques d'impression lithographiques Download PDF

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Publication number
EP0960730B1
EP0960730B1 EP19990200847 EP99200847A EP0960730B1 EP 0960730 B1 EP0960730 B1 EP 0960730B1 EP 19990200847 EP19990200847 EP 19990200847 EP 99200847 A EP99200847 A EP 99200847A EP 0960730 B1 EP0960730 B1 EP 0960730B1
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EP
European Patent Office
Prior art keywords
imaging element
heat
element according
printing plate
polymer
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
EP19990200847
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German (de)
English (en)
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EP0960730A1 (fr
Inventor
Marc C/O Agfa-Gevaert N.V. Van Damme
Huub c/o Agfa-Gevaert N.V. Van Aert
Joan C/O Agfa-Gevaert N.V. Vermeersch
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Agfa Gevaert NV
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Agfa Gevaert NV
Agfa Gevaert AG
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Priority to EP19990200847 priority Critical patent/EP0960730B1/fr
Publication of EP0960730A1 publication Critical patent/EP0960730A1/fr
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Classifications

    • 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
    • B41C1/1008—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials
    • B41C1/1016—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials characterised by structural details, e.g. protective layers, backcoat layers or several imaging layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/02—Positive working, i.e. the exposed (imaged) areas are removed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/04—Negative working, i.e. the non-exposed (non-imaged) areas are removed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/08—Developable by water or the fountain solution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/14—Multiple imaging layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/22—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by organic non-macromolecular additives, e.g. dyes, UV-absorbers, plasticisers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/24—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by a macromolecular compound or binder obtained by reactions involving carbon-to-carbon unsaturated bonds, e.g. acrylics, vinyl polymers

Definitions

  • the present invention relates to a heat sensitive imaging element. More specifically the invention is related to a heat sensitive imaging imaging element for preparing a lithographic printing plate which can be imaged on the press.
  • Lithography is the process of printing from specially prepared surfaces, some areas of which are capable of accepting lithographic ink, whereas other areas, when moistened with water, will not accept the ink.
  • the areas which accept ink define the printing image areas and the ink-rejecting areas define the background areas.
  • a photographic material is made imagewise receptive to oily or greasy inks in the photo-exposed (negative-working) or in the non-exposed areas (positive-working) on a hydrophilic background.
  • lithographic printing plates also called surface litho plates or planographic printing plates
  • a support that has affinity to water or obtains such affinity by chemical treatment is coated with a thin layer of a photosensitive composition.
  • Coatings for that purpose include light-sensitive polymer layers containing diazo compounds, dichromate-sensitized hydrophilic colloids and a large variety of synthetic photopolymers. Particularly diazo-sensitized systems are widely used.
  • the exposed image areas become insoluble and the unexposed areas remain soluble.
  • the plate is then developed with a suitable liquid to remove the diazonium salt or diazo resin in the unexposed areas.
  • printing plates are known that include a photosensitive coating that upon image-wise exposure is rendered soluble at the exposed areas. Subsequent development then removes the exposed areas.
  • a typical example of such photosensitive coating is a quinone-diazide based coating.
  • the above described photographic materials from which the printing plates are made are exposed in contact through a photographic film that contains the image that is to be reproduced in a lithographic printing process.
  • Such method of working is cumbersome and labor intensive.
  • the printing plates thus obtained are of superior lithographic quality.
  • GB- 1 492 070 discloses a method wherein a metal layer or a layer containing carbon black is provided on a photosensitive coating. This metal layer is then ablated by means of a laser so that an image mask on the photosensitive layer is obtained. The photosensitive layer is then overall exposed by UV-light through the image mask. After removal of the image mask, the photosensitive layer is developed to obtain a printing plate.
  • This method however still has the disadvantage that the image mask has to be removed prior to development of the photosensitive layer by a cumbersome processing.
  • EP-A- 444 786, JP- 63-208036 ,and JP- 63-274592 disclose photopolymer resists that are sensitized to the near IR. So far, 5 none has proved commercially viable and all require wet development to wash off the unexposed regions.
  • EP-A- 514 145 describes a laser addressed plate in which heat generated by the laser exposure causes particles in the plate coating to melt and coalescence and hence change their solubility characteristics. Once again, wet development is required.
  • WO- 92/09934 discloses imaging elements including coatings that become hydrophiliic as a result of irradiation.
  • the coatings 5 comprise an acid-sensitive polymer and a photochemical source of strong acid, and in both cases the preferred acid-sensitive polymer is derived from a cyclic acetal ester of acrylic or methacrylic acid, such as tetrahydropyranyl (meth)acrylate.
  • WO- 92/02855 discloses that the acid-sensitive polymer is blended with a low-Tg polymer to produce a coating that is initially non-tacky, but on irradiation undergoes phase separation as a result of chemical conversion of the acid-sensitive polymer, and becomes tacky.
  • WO- 92/09934 discloses that an acid-sensitive polymer is optionally blended with one or more photoacid generators. Subsequent to imagewise exposure to UV/visible radiation, the exposed areas are preferentially wettable by water, and the coatings may function as lithographic printing plates requiring no wet processing. There is no disclosure of laser addresses.
  • EP-A- 652 483 discloses a lithographic printing plate requiring no dissolution processing which comprises a substrate bearing a heat-sensitive coating, which coating becomes relatively more hydrophilic under the action of heat Said system yields a positive working printing plate.
  • An analogous system, however yielding a negative working printing plate is not known.
  • EP-A- 507 008 provides homopolymers and copolymers containing aryldiazosulphonate units having a maximal spectral sensitivity of at or above 320 nm. These polymers are especially suitable for the production of printing plates.
  • US-P- 5 713 287 discloses a printing plate comprising hydrophobic polymers which turn into hydrophilic polymers on heating, mixed with infra-red dyes.
  • GB-A- 1 195 841 discloses a thermal imaging element comprising a support and at least one layer containing a radiation to heat converting substance and a thermally degradable polumer composed of recurring units linked by azo groups.
  • a heat-sensitive imaging element for providing a lithographic printing plate, comprising a lithographic support with a hydrophilic surface and a top layer wherein said top layer or a layer adjacent to said top layer comprises a compound capable of converting light into heat,characterized in that said top layer further comprises a polymer containing aryldiazosulphonate units.
  • the image forming layer which becomes more hydrophobic under the influence of heat comprises a polymer or copolymer which contains aryldiazosulphonate units.
  • a photosensitive polymer having aryldiazosulphonate units also called aryldiazosulphonate resin, preferably is a polymer having aryldiazosulphonate units corresponding to the following formula: wherein R 0,1,2 each independently represent hydrogen, an alkyl group, a nitrile or a halogen, e.g. Cl, L represents a divalent linking group, n represents 0 or 1, A represents an aryl group and M represents a cation.
  • L preferably represents divalent linking group selected from the group consisting of: -(X) t -CONR 3 -, -(X) t -COO-, -X- and -(X) t -CO-, wherein t represents 0 or 1, R 3 represents hydrogen, an alkyl group or an aryl group, X represents an alkylene group, an arylene group, an alkylenoxy group, an arylenoxy group, an alkylenethio group, an arylenethio group, an alkylenamino group, an arylenamino group, oxygen,sulfur or an aminogroup.
  • A preferably represents an unsubstituted aryl group, e.g.
  • phenyl group or more preferably an aryl group, e.g. phenyl, substituted with one or more alkyl group, aryl group, alkoxy group, aryloxy group or amino group.
  • M preferably represents a cation such as NH4 + or a metal ion such as a cation of Al, Cu, Zn, an alkaline earth metal or alkali metal.
  • a polymer having aryldiazosulphonate units is preferably obtained by radical polymerisation of a corresponding monomer. Suitable monomers for use in accordance with the present invention are disclosed in EP-A- 339 393 and EP-A- 507 008.
  • Aryldiazosulphonate monomers can be 5 homopolymerised or copolymerised with other aryldiazosulphonate monomers and/or with vinyl monomers such as (meth)acrylic acid or esters thereof, (meth)acrylamide, acrylonitrile, vinylacetate, vinylchloride, vinylidene chloride, styrene, alpha-methyl styrene etc..
  • vinyl monomers such as (meth)acrylic acid or esters thereof, (meth)acrylamide, acrylonitrile, vinylacetate, vinylchloride, vinylidene chloride, styrene, alpha-methyl styrene etc.
  • the amount of aryldiazosulphonate comprising units in a copolymer in connection with this invention is between 10 mol % and 60 mol %.
  • an aryldiazosulphonate containing polymer may be prepared by reacting a polymer having e.g. acid groups or acid halide groups with an amino or hydroxy substituted aryldiazosulphonate. Further details on this procedure can be found in EP-A- 507 008.
  • the image forming layer or a layer adjacent to said layer includes a compound capable of converting light into heat.
  • Suitable compounds capable of converting light into heat are preferably infrared absorbing components although the wavelength of absorption is not of particular importance as long as the absorption of the compound used is in the wavelength range of the light source used for image-wise exposure.
  • Particularly useful compounds are for example dyes and in particular infrared absorbing dyes and pigments and in particular infrared absorbing pigments. Examples of infrared absorbing dyes are disclosed in EP-A- 97 203 131.4.
  • infrared absorbing pigments are carbon black, metal carbides, borides, nitrides, carbonitrides, bronze-structured oxides and oxides structurally related to the bronze family but lacking the A component e.g. WO 2.9 . It is also possible to use conductive polymer dispersion such as polypyrrole or polyaniline-based conductive polymer dispersions. Said compound capable of converting light into heat is preferably present in the top layer but can also be included in the adjacent layer.
  • Said compound capable of converting light into heat is present in the imaging element preferably in an amount between 1 and 25 % by weight of the total weight of the image forming layer, more preferably in an amount between 2 and 20 % by weight of the total weight of the image forming layer.
  • the compound capable of converting light into heat is most preferably present in the imaging element in an amount to provide an optical density at a wavelength between 800 nm and 1100nm of at least 0.35.
  • the image forming layer is preferably applied in an amount between 0.1 and 5 g/m 2 , more preferably in an amount between 0.5 and 3 g/m 2 .
  • the lithographic base may be an anodised aluminum.
  • 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 having 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, acrylic acid, methacrylic 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 5 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, cellulose acetate film, polystyrene film, polycarbonate film etc.
  • the plastic film support may be opaque or transparent.
  • 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.
  • the imaging element can contain other layers such as subbing layers and antihalo layers.
  • the imaging element can be prepared by applying the different layers according to any known technique.
  • said imaging element may be prepared on the press with the support already on the press by a coater or coaters placed in the immediate vicinity of the press.
  • Imaging in connection with the present invention is preferably done with an image-wise scanning exposure, involving the use of a laser, more preferably of a laser that operates in the infrared or near-infrared, i.e. wavelength range of 700-1500 nm. Most preferred are laser diodes emitting in the near-infrared. Exposure of the imaging element can be performed with lasers with a short as well as with lasers with a long pixel dwell time. Preferred are lasers with a pixel dwell time between 0.005 ⁇ s and 20 ⁇ s.
  • the exposure of the imaging element can be carried out with the imaging element already on the press.
  • a computer or other information source supplies graphics and textual information to the laser via a lead.
  • 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.
  • 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 which has as diameter the diameter of the print cylinder is slided on the print cylinder instead of applying in a classical way a classically formed printing plate. More details on sleeves are given in "Grafisch Nieuws" ed. Keesing, 15, 1995, page 4 to 6.
  • the image-wise exposed imaging element can be developed by washing with plain water or an aqueous solution.
  • the plate is then ready for printing and can be mounted on the press.
  • the imaging element can be subjected to an overall post-exposure to UV-radiation to harden the image in order to increase the run lenght of the printing plate.
  • the image-wise exposed imaging element after optional wiping is mounted on a print cylinder of a printing press with the backside of the imaging element (side of the support opposite to the side having the photosensitive layer).
  • the printing press is then started and while the print cylinder with the imaging element mounted thereon rotates, the dampener rollers that supply dampening liquid are dropped on the imaging element and subsequent thereto the ink rollers are dropped.
  • the dampener rollers may be dropped simultaneously or the ink rollers may be dropped first.
  • the photosensitive layer of an image-wise exposed imaging element in accordance with the present invention is wiped with e.g. a cotton pad or sponge soaked with water before mounting the imaging element on the press or at least before the printing press starts running.
  • a cotton pad or sponge soaked with water This will remove some unexposed aryldiazosulphonate resin but will not actually develop the imaging element.
  • it has the advantage that possible substantial contamination of the dampening system of the press and ink used is avoided.
  • An exposed imaging element in accordance with the present invention is preferably mounted on a printing press and used to print shortly after the exposure. It is however possible to store an exposed imaging element for some time in the dark before using it on a printing press to print copies.
  • Suitable dampening liquids that can be used in connection with the present invention are aqueous liquids generally having an acidic pH and comprising an alcohol such as isopropanol and silica.
  • dampening liquids useful in the present invention there is no particular limitation and commercially available dampening liquids, also known as fountain solutions, can be used.
  • dampening liquids also known as fountain solutions.
  • the invention will now be illustrated by the following examples without however the intention to limit the invention thereto. All parts are by weight unless stated otherwise.
  • 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.
  • the obtained solution was coated on the lithographic base to a wet coating thickness of 30 ⁇ m and dried at 30°C.
  • This plate was imaged on a CREO 3244 TRENDSETTER TM (available from Creo) at 2400 dpi. operating at a drum speed of 60 rpm and a laser output of 11 Watt.
  • the press was started by allowing the print cylinder with the imaging element mounted thereon to rotate.
  • the dampener rollers of the press were then dropped on the imaging element so as to supply dampening liquid to the imaging element and after 10 revolutions of the print cylinder, the ink rollers were dropped to supply ink. After 10 further revolutions clear prints were obtained with no ink uptake in the non-image parts.
  • the azogroups containing substances have to be protected from light e.g. by darkening the room or wrapping the flasks with aluminum foil.
  • the reagents were obtained from Fluka and Aldrich, solvents were distilled before use.
  • Solution 3 is added dropwise to solution 2 while cooling (below 5°C), then it is stirred for 10 minutes. After filtration the solution is poured quickly into solution 1 under intensive stirring. Then the solution is stirred for 30 minutes. The solution may be red at the beginning but the colour turns to yellow after some minutes. The solid product is filtered off from the solution and used without further purification.
  • the product is dissolved in 150 ml water, 8 g NaOH are added, then the solution is heated to 50°C for one hour and afterwards cooled down to 0°C. While still cooling, 19,66 ml concentrated HCl (32%) are added to the solution. Then 100 ml 1% picrinic acid and a solution of 33,6 sodium carbonate in about 350 ml water are poured into the mixture. Before adding the methacrylic acid chloride the temperature of the solution has to be below 5°C. From a dropping funnel 15 ml of methacrylic acid chloride is very slowly dropped to the solution (heavy foaming). The mixture needs to be stirred for 1 hour at 0-5°C and after that for another hour at room temperature.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Printing Plates And Materials Therefor (AREA)

Claims (10)

  1. Élément de formation d'image thermosensible pour procurer un cliché d'impression lithographique comprenant un support lithographique muni d'une surface hydrophile et d'une couche de protection, dans lequel ladite couche de protection ou une couche adjacente à ladite couche de protection comprend un composé capable de transformer de la lumière en chaleur, caractérisé en ce que ladite couche de protection comprend en outre un polymère contenant des unités d'aryldiazosulfonates.
  2. Élément de formation d'image thermosensible selon la revendication 1, dans lequel la quantité des unités structurales d'aryldiazosulfonates dans ledit polymère se situe entre 10 moles % et 60 moles %.
  3. Élément de formation d'image thermosensible selon la revendication 1 ou 2, dans lequel ledit polymère comprenant des unités d'aryldiazosulfonates est un copolymère avec un monomère choisi parmi le groupe constitué par l'acide (méth)acrylique ou ses esters, le (méth)acrylamide, l'acrylonitrile, l'acétate de vinyle, le chlorure de vinyle, le chlorure de vinylidène, le styrène, l'alpha-méthylstyrène.
  4. Élément de formation d'image thermosensible selon l'une quelconque des revendications 1 à 3, dans lequel lesdites unités d'aryldiazosulfonates sont des unités d'aryldiazosulfonates substitués.
  5. Élément de formation d'image thermosensible selon l'une quelconque des revendications 1 à 4, dans lequel le composé capable de transformer de la lumière en chaleur est un composant absorbant dans le domaine infrarouge du spectre.
  6. Élément de formation d'image thermosensible selon la revendication 5, dans lequel ledit composant absorbant dans le domaine infrarouge du spectre est un colorant absorbant dans le domaine infrarouge du spectre.
  7. Élément de formation d'image thermosensible selon la revendication 5, dans lequel ledit composant absorbant dans le domaine infrarouge du spectre est un pigment absorbant dans le domaine infrarouge du spectre.
  8. Procédé pour procurer un cliché d'impression lithographique, comprenant les étapes ci-après consistant à:
    exposer en forme d'image un élément de formation d'image selon l'une quelconque des revendications 1 à 7 ;
    développer ledit élément de formation d'image à l'état exposé avec de l'eau ordinaire ou avec une solution aqueuse.
  9. Procédé d'impression selon la revendication 8, comprenant en outre le fait d'exposer globalement par exposition à un rayonnement ultraviolet, l'élément développé formant une image.
  10. Procédé d'impression comprenant les étapes indiquées ci-après consistant à :
    exposer un élément de formation d'image selon l'une quelconque des revendications 1 à 7 ;
    monter sur une presse l'élément de formation d'image exposé ;
    appliquer de l'encre et une solution de mouillage sur l'élément de formation d'image ; et
    imprimer à partir dudit élément de formation d'image.
EP19990200847 1998-05-25 1999-03-18 Elément formateur d'images sensible à la chaleur pour la fabrication de plaques d'impression lithographiques Expired - Lifetime EP0960730B1 (fr)

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EP19990200847 EP0960730B1 (fr) 1998-05-25 1999-03-18 Elément formateur d'images sensible à la chaleur pour la fabrication de plaques d'impression lithographiques

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EP98201767 1998-05-25
EP98201767 1998-05-25
EP19990200847 EP0960730B1 (fr) 1998-05-25 1999-03-18 Elément formateur d'images sensible à la chaleur pour la fabrication de plaques d'impression lithographiques

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EP0960730A1 EP0960730A1 (fr) 1999-12-01
EP0960730B1 true EP0960730B1 (fr) 2003-07-02

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Publication number Priority date Publication date Assignee Title
EP1267211A1 (fr) * 2001-06-13 2002-12-18 Agfa-Gevaert Elément formateur d'image sensible aux UV pour la fabrication de plaques d'impression lithographiques
US6641970B2 (en) 2001-06-13 2003-11-04 Agfa-Gevaert UV-sensitive imaging element for making lithographic printing plates comprising an aryldiazosulfonate polymer and a compound sensitive to UV light
DE602006009919D1 (de) 2006-08-03 2009-12-03 Agfa Graphics Nv Flachdruckplattenträger
ES2344668T3 (es) 2007-11-30 2010-09-02 Agfa Graphics N.V. Metodo para tratar una plancha de impresion litografica.
EP2098376B1 (fr) 2008-03-04 2013-09-18 Agfa Graphics N.V. Procédé pour réaliser un support de plaque d'impression lithographique
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EP3032334B1 (fr) 2014-12-08 2017-10-18 Agfa Graphics Nv Système permettant de réduire les débris d'ablation
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