EP0952926B1 - Laser-imageable recording material and printing plate produced therefrom for waterless offset printing - Google Patents
Laser-imageable recording material and printing plate produced therefrom for waterless offset printing Download PDFInfo
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- EP0952926B1 EP0952926B1 EP98904059A EP98904059A EP0952926B1 EP 0952926 B1 EP0952926 B1 EP 0952926B1 EP 98904059 A EP98904059 A EP 98904059A EP 98904059 A EP98904059 A EP 98904059A EP 0952926 B1 EP0952926 B1 EP 0952926B1
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- Prior art keywords
- layer
- recording material
- material according
- weight
- absorbing
- Prior art date
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Classifications
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- 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
- B41C1/1033—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 by laser or spark ablation
-
- 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
- B41N1/00—Printing plates or foils; Materials therefor
- B41N1/003—Printing plates or foils; Materials therefor with ink abhesive means or abhesive forming means, such as abhesive siloxane or fluoro compounds, e.g. for dry lithographic printing
-
- 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
- B41C2210/16—Waterless working, i.e. ink repelling exposed (imaged) or non-exposed (non-imaged) areas, not requiring fountain solution or water, e.g. dry lithography or driography
Definitions
- the invention relates to a recording material having a plate- or sheet-like substrate, a top layer comprising a cured silicone rubber and at least one IR-absorbing layer, which comprises at least one IR-absorbing component and at least one polymeric, organic binder and decomposes under the action of IR laser radiation or changes so that its adhesion to the silicone top layer decreases. It can be provided with an image by means of laser radiation and serves primarily for the production of offset printing plates which print a waterless method.
- DE-A 25 12 038 describes a material which consists of a substrate, an intermediate layer which contains particles absorbing laser energy (in particular carbon black), nitrocellulose and a crosslinking agent, and a silicone rubber layer. Aluminium, paper and plastic are mentioned as substrates. To prevent the heat generated by the laser from being conducted away by the aluminium, the aluminium surface is preferably provided with an insulating layer of an oleophilic resin. The plate is exposed to infrared or visible laser radiation, preferably from an Nd-YAG laser or an argon laser. In the parts which the radiation strikes, the intermediate layer is oxidized and combusted. Consequently, the silicone layer present on top becomes detached and can be removed with an organic solvent. However, the recording material has only relatively little sensitivity. Moreover, the plates produced therefrom permit only a short print run.
- EP-A 573 091 and EP-A 685 333 likewise describe a material for the production of waterless offset printing plates.
- it comprises a substrate having an oleophilic surface, a recording layer which is applied thereon, is not more than 3 ⁇ m thick and contains a substance which converts radiation into heat, and a cured silicone layer.
- the substrates used are generally films of polyester, polycarbonate or polystyrene. Polyolefin-coated paper is also suitable. Aluminium substrates are also mentioned; however, these must be provided with a special oleophilic coating. Carbon black and pigments and dyes which absorb in the infrared range are mentioned as substances which convert radiation into heat.
- the recording layer may also comprise a metal, e.g.
- EP-A 580 393 discloses, inter alia, a three-layer recording material for the production of waterless offset printing plates. It comprises in general a substrate which reflects IR radiation, for example a substrate of degreased, bright-rolled aluminium or a polyester film, on which a reflecting aluminium layer has been applied by vacuum vapour deposition or by sputtering. An IR-absorbing layer and a silicone top layer are then applied to this substrate. The IR-absorbing layer is removed by imagewise exposure to laser radiation of appropriate wavelength. Consequently, those parts of the silicone layer which are present on top become detached and can be removed mechanically, for example by means of brushing.
- the metallic or metallized substrate has only little affinity to water. The disadvantage of such a recording material is once again the low adhesion between the substrate and the layer present on top. printing plate produced therefrom accordingly gives only a short print run.
- a further layer which itself does not absorb laser radiation but, under the action of laser radiation on the IR-absorbing layer present on top, undergoes thermal decomposition with formation of gaseous products is arranged between the substrate and the IR-absorbing layer.
- the thickness of this further layer is chosen so that it undergoes only partial decomposition. In general, it is from 1 to 30 ⁇ m thick.
- An adhesion-promoting layer for example a layer of a silane or a protein, may also be arranged between substrate and thermally decomposable layer.
- the substrate preferably consists of aluminium or one of its alloys. It is in general mechanically, chemically and/or electrochemically roughened. This roughening can be achieved by dry brushing, wet brushing, sand-blasting, chemical treatment and/or electrochemical treatment. The electrochemical roughening is preferred. It leads to outstanding anchoring of the IR-absorbing layer on top.
- the average peak-to-valley height R Z (determined according to DIN 4768 - October 1970 edition) of the surface is in the range from about 0.5 to 15 ⁇ m.
- the metallic substrate generally has high thermal conductivity. Its surface area increases owing to the roughening, with the result that the heat induced by the laser radiation can be removed even more rapidly.
- the metal oxide layer has a heat-insulating action and substantially slows down the loss of heat.
- the layer comprising the metal oxide, especially alumina has in general only 1/10 or less of the thermal conductivity of the respective metal.
- the oxide is preferably produced electrochemically directly from the metal of the substrate. Particularly in the case of aluminium substrates, the electrochemical oxidation can be controlled so that pores form in the oxide layer and even further reduce the thermal conductivity.
- the production of such oxide layers is generally known and described (for example in EP-A 161 461).
- a hydrophilic, abrasion-resistant surface is produced on the substrate.
- the weight of the oxide layer is in general from 0.5 to 10 g/m 2 , preferably from 1 to 5 g/m 2 .
- the surface obtained by the combination of roughening and oxidation reflects the IR laser radiation to a substantially lesser extent so that excellent reproduction of fine image elements and hence high resolution are ensured.
- the surface of the metal oxide layer is hydrophilic. Surprisingly, this hydrophilic surface shows excellent ink acceptance during subsequent printing. The prior art had suggested that only an oleophilic surface meets this requirement.
- the waterless offset printing plates produced from the recording material according to the invention give prints of excellent quality.
- the achievable print run is long; in general, it is more than 100,000 prints.
- the IR-absorbing layer contains components, in particular pigments or dyes, which absorb laser radiation having a wavelength in the infrared range (especially in the range from 700 to 1200 nm).
- the pigments are also to include carbon black.
- Suitable IR absorbers are mentioned in J. Fabian et al., Chem. Rev. 92 [1992] 1197. Pigments which contain metals, metal oxides, metal sulphides, metal carbides or similar metal compounds are also suitable.
- Finely divided metallic elements of main groups II to V and of subgroups I, II and IV to VIII of the Periodic Table such as Mg, Al, Bi, Sn, In, Zn, Ti, Cr, Mo, W, Co, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zr or Te, are preferred.
- Other suitable IR-absorbing components are metal-phthalocyanine compounds, anthraquinones, polythiophenes, polyanilines, polyacetylenes, polyphenylenes, polyphenylene sulphides and polypyrroles.
- the absorbing pigment particles should have a mean diameter of, as far as possible, not more than 30 ⁇ m.
- the amount of the IR-absorbing component is in general from 2 to 80% by weight, preferably from 5 to 57% by weight, based in each case on the total weight of the nonvolatile components of the layer.
- the IR-absorbing layer furthermore contains at least one polymeric, organic binder. Binders which undergo spontaneous decomposition under the action of heat are particularly advantageous. These binders undergoing autoxidation include in particular nitro-cellulose. Polymers which do not undergo autoxidation and which undergo thermally induced decomposition indirectly with the formation of gaseous or volatile cleavage products may also be used.
- ethylcellulose examples include ethylcellulose, (meth)acrylate polymers and copolymers (such as poly(methyl methacrylate), poly(butyl acrylate), poly(2-hydroxyethyl methacrylate), copolymers of lauryl acrylate and methacrylic acid, polystyrene, poly(methylstyrene), copolymers of vinyl chloride and vinyl acetate, polyurethanes, polycarbonates and polysulphones.
- the directly or indirectly thermally decomposable polymers are not required in every case, so that other film-forming polymers may also be used. This applies when the IR-absorbing component already forms sufficiently volatile products under irradiation.
- the "other film-forming polymers” are in particular homo- and copolymers containing units of (meth)acrylic acid, (meth)acrylates and/or (meth)acrylamides, as well as polyvinyl acetates and polyvinyl acetals, which, if appropriate, are furthermore modified with carboxyl groups. They are used either in combination with the thermally decomposable materials or alone.
- the amount of the binders is in general from about 20 to 95% by weight, preferably from 30 to 80% by weight, based in each case on the total weight of the nonvolatile components of the layer.
- the layer may also contain compounds which crosslink the binder.
- the type of crosslinking agent depends on the chemical functionality of the binder (S. Paul, Crosslinking Chemistry of Surface Coatings in Comprehensive Polymer Science, Volume 6, Chapter 6, page 149).
- the amount of the crosslinking agent or agents is in general from 0 to 30% by weight, preferably from 3 to 20% by weight, particularly preferably from 5 to 15% by weight, based in each case on the total weight of the nonvolatile components of the layer.
- the IR-absorbing layer may moreover contain compounds which undergo decomposition under the action of heat and/or IR radiation or by chemical induction and form chemically active species (in particular acids), which in turn cause cleavage or decomposition of the polymeric, organic binder. Once again, volatile cleavage or decomposition products are formed. Binders which contain tert-butoxycarbonyl groups give, for example, CO 2 and isobutene when acid acts thereon. Furthermore, the layer may contain compounds which form low molecular weight, gaseous or at least volatile cleavage products (Encycl. Polym. Sci. Eng., Vol. 2, page 434). Examples of such compounds are diazonium salts, azides, bicarbonates and azobicarbonates.
- the IR-absorbing layer can in addition contain stabilizers for increasing the storability, plasticizers, catalysts for initiating the crosslinking reaction, dulling agents, additional dyes, surfactants, levelling agents or other auxiliaries for improving stability, processing or reprographic quality.
- the amount of these additives is in general from 0 to 50% by weight, preferably from 10 to 30% by weight, based in each case on the weight of the nonvolatile components of the layer.
- the weight of the IR-absorbing layer is in general from 0.15 to 5 g/m 2 , preferably from 0.5 to 3.5 g/m 2 .
- the IR-absorbing layer is produced by applying and drying an appropriate coating solution. Suitable solvents for the preparation of the coating solution include ketones, esters, glycol ethers, alcohols, ethers or mixtures thereof.
- the silicone top layer is oleophobic and repels the ink during printing. It consists of crosslinked silicone rubber. Any silicone rubber which is sufficiently ink-repellent to permit printing without damping solution is in principle suitable.
- silicone rubber is intended to be understood as meaning a high molecular weight, essentially linear diorganopolysiloxane, in accordance with the definition of Noll "Chemie und Technologie der Silikone” [Chemistry and Technology of the Silicones], Verlag Chemie [1968], page 332.
- vulcanized silicone rubber is used for the crosslinked or vulcanized products.
- a solution of silicone rubber is applied to the IR-absorbing layer, dried and crosslinked.
- Particularly suitable solvents are toluene, xylene and in particular isoparaffins (boiling range from 100 to 180°C).
- the silicone rubbers may be one-component or multicomponent rubbers. Examples are described in DE-A 23 50 211, 23 57 871 and 23 59 101. Particularly suitable one-component silicone rubbers are polydimethylsiloxanes which carry hydrogen atoms, acetyl, oxime, alkoxy or amino groups or other functional groups at the chain ends. The methyl groups in the chain may also be replaced by other alkyl groups, by haloalkyl groups or by unsubstituted or substituted aryl groups (in particular phenyl groups). The terminal functional groups are readily hydrolysable and cure in a short time (from a few minutes to a few hours) in the presence of moisture.
- the multicomponent silicone rubbers are crosslinkable by addition or condensation.
- the addition-crosslinkable types contain in general two different polysiloxanes.
- One polysiloxane is generally present in an amount of from 70 to 99% by weight and has alkylene groups (in particular vinyl groups). The other is present in general in an amount of from 1 to 10% by weight.
- hydrogen atoms are bonded directly to silicon atoms.
- the addition reaction is effected by heating to more than 50°C in the presence of from about 0.0005 to 0.002% by weight of a platinum catalyst.
- Multicomponent silicone rubbers have the advantage that they crosslink very rapidly at relatively high temperature (about 100°C).
- the condensation-crosslinkable mixtures contain diorganopolysiloxanes having reactive terminal groups, such as hydroxyl and acetoxy groups. These are crosslinked with silanes or oligosilanes in the presence of catalysts. Crosslinking agents are present in an amount of from 2 to 15% by weight, while the catalysts are present in an amount of from 0.01 to 10% by weight, based in each case on the total weight of the nonvolatile components of the layer. These mixtures, too, react relatively rapidly and therefore have only a limited pot life.
- a particularly preferred mixture consists of
- the silicone layer may contain further components. These may serve for additional crosslinking, better adhesion, mechanical strengthening or colouring. These further components which are only optionally present may be present in an amount of not more than 10% by weight, preferably not more than 5% by weight, based in each case on the total weight of the layer.
- the cured silicone rubber layer is virtually insoluble in organic solvents. It is transparent for the IR laser radiation and itself absorbs virtually no IR radiation (compounds with which the silicone layer may be coloured must therefore be appropriately chosen).
- the weight of the cured silicone layer is in general from 1 to 20 g/m 2 , preferably from 1 to 5 g/m 2 , which corresponds approximately to a thickness of from 0.8 to 17 ⁇ m, preferably from 0.8 to 4 ⁇ m.
- the printing plates are produced by imagewise exposure to IR laser radiation.
- YAG lasers, Nd-YAG lasers, argon lasers, semiconductor lasers and laser diodes, each of which emit radiation in the IR range, are preferred. They generally have an output power of between 40 and 7500 mW.
- the radiation energy is in general from 20 to 600 mJ/cm 2 . As low a radiation energy as possible is desirable.
- the laser radiation results in ablation of the IR-absorbing layer, with the result that at the same time the oleophobic silicone layer becomes detached and is simultaneously removed. Loosely adhering layer components can be removed mechanically (for example by wiping), if appropriate with a suitable solvent.
- the printing plates can be produced in this manner in a single step. A further advantage is that only a very small amount of liquid waste products, if any, are obtained.
- the present invention thus also relates to a process for the production of a waterless offset printing plate, which is characterized in that IR laser radiation is allowed to act imagewise on the recording material according to the invention.
- a waterless offset printing plate thus produced, the hydrophilic surface of the oxide layer is ink-carrying and the oleophobic top layer is ink-repellent.
- the present invention finally also relates to the printing plate produced from the recording material according to the invention.
- a 0.3 mm thick, electrolytically roughened and anodically oxidized aluminium plate having an oxide weight of 3.6 g/m 2 was rendered hydrophilic with a 0.1% by weight aqueous polyvinylphosphonic acid solution.
- the recording material thus produced was mounted on a uniformly driveable drum and recorded on by means of a continuously operating Nd-YAG laser (200 mW output power at 1064 nm) with a resolution of 1200 dpi.
- the exposure time which was variable by changing the rotational speed of the drum, was set at 15 ⁇ s per pixel. This corresponds to an energy of about 500 mJ/cm 2 .
- the material on which various line patterns are recorded is wiped with a 1% strength by weight surfactant solution (e.g. ®Glucopon 600 CS UP, Henkel) to remove the ablated material and is used for printing under the conditions usual for waterless offset. Well over 100,000 prints of excellent quality can be produced.
- a 0.2 mm thick, electrolytically roughened and anodically oxidized aluminium plate having an oxide weight of 3.4 g/m 2 was rendered hydrophilic with a 0.1% by weight aqueous polyvinylphosphonic acid solution.
- Coating solutions are prepared with the components stated in Table 1 and are applied, as described in Example 1, to this substrate type and dried.
- Example 1 The silicone rubber described in Example 1 is applied to the various IR absorber layers.
- the resulting printing plates are provided with an image analogously to Example 1, processed and used for printing.
Abstract
Description
- a plate- or sheet-like substrate,
- a top layer comprising a cured silicone rubber, and
- at least one IR-absorbing layer which comprises at least one IR-absorbing component and at least one polymeric, organic binder and decomposes under the action of IR laser radiation or changes so that its adhesion to the silicone top layer decreases,
- hydroxyl-terminated polydimethylsiloxanes,
- a silane crosslinking component (in particular a tetra- or trifunctional alkoxy-, acetoxy-, amido-, amino-, aminoxy-, ketoximino- or enoxysilane) or functionalized silicone resins,
- a crosslinking catalyst (in particular an organotin or organotitanium compound) and
- if appropriate, further components, such as
- organopolysiloxane compounds having Si-H bonds,
- platinum catalysts for further addition crosslinking,
- silanes having adhesion-improving properties,
- reaction inhibitors,
- fillers and/or dyes.
- 44.4 pbw
- of a 20% by weight ®Efweko NC 118 solution (Degussa
AG), which consists of
- 18.0 pbw
- of High-Color-Channel (HCC) carbon black,
- 28.0 pbw
- of collodium wool of standard type 24 E,
- 28.0 pbw
- of collodium wool of standard type 27 E,
- 22.0 pbw
- of dibutyl phthalate and
- 4.0 pbw
- of the copper salt of 2-ethylhexanoic acid in propylene glycol methyl ether acetate,
- 7.88 pbw
- of a 20% by weight solution of a mixture of diphenylmethane 4,4'-diisocyanate and polymeric components (® Desmodur VKS) and
- 4.20 pbw
- of a 1% by weight solution of silicone oil in
butan-2-one in a mixture of
- 73.2 pbw
- of butan-2-one and
- 20.3 pbw
- of propylene glycol methyl ether acetate (PGMEA)
- 33.5 pbw
- of a 33% by weight solution of polydimethylsiloxanes containing hydroxyl groups in toluene (viscosity 9,000-15,000 mPa·s at 25°C, Wacker ®Dehesive 810),
- 1.56 pbw
- of a 50% by weight solution of silicone resin having aminoalkyl groups in toluene (Wacker V 83) and
- 0.67 pbw
- of dibutyltin diacetate in 214 pbw of isoparaffin (initial boiling point 118°C)
Components for layers absorbing IR radiation | |||||||||
Component | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
Carbon black A | 11.8 | - | - | - | - | 9.93 | 9.41 | 9.39 | 9.30 |
Carbon black B | - | 7.05 | - | - | - | - | - | - | - |
Carbon black C | - | - | 4.58 | - | - | - | - | - | - |
Carbon black D4) | - | - | - | 7.25 | 15.0 | - | - | - | - |
VP-N-31085) | - | - | 5.25 | 6.78 | - | - | - | - | - |
Carboset 526 | - | - | - | - | 3.57 | - | - | - | - |
Cymel 301 (20% MEK) | 3.13 | 1.88 | 2.63 | 2.63 | 2.63 | - | - | - | 2.63 |
Desmodur VKS (20% MEK) | - | - | - | - | - | - | 5.25 | - | - |
Desmodur VK (20% MEK) | - | - | - | - | - | 2.63 | - | - | - |
Silane Z-6124 | - | - | - | - | - | - | - | - | 0.53 |
EP 140 (20% MEK) | - | - | - | - | - | - | - | 5.25 | - |
pTosOH (10% MEK) | 1.25 | 0.79 | 1.05 | 1.05 | 1.05 | - | - | - | 1.05 |
DABCO (10% MEK) | - | - | - | - | - | - | - | 0.21 | - |
Silicone oil (1% MEK) | - | - | 4.20 | 4.20 | - | 4.20 | 4.20 | 4.20 | 4.20 |
Ethyl acetate | 232 | 140 | - | - | 128 | - | - | ||
Butyl acetate | 1.66 | 1.00 | - | - | - | - | - | ||
2-Butanone | - | - | 76.5 | 76.5 | - | 77.4 | 75.3 | 75.2 | 76.5 |
Propylene glycol methyl ether acetate | - | - | 55.8 | 51.6 | - | 55.8 | 55.8 | 55.8 | 37.2 |
Layer weight [g/m2] | 1.6 | 2.2 | 4.1 | 3.9 | 3.0 | 2.8 | 2.2 | 2.6 | 2.4 |
Components for silicone layers | |||||||||
Component | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
Polymer | 18.8 | 17.7 | 17.7 | - | 19.9 | - | - | - | - |
Polymer | - | - | - | 13.3 | - | - | - | - | - |
Polymer | - | - | - | - | - | 19.4 | - | - | - |
Polymer | - | - | - | - | - | - | 9.46 | - | - |
Polymer | - | - | - | - | - | - | - | 8.59 | 8.41 |
V 83 | 0.88 | 0.88 | 0.88 | 0.94 | - | - | - | - | - |
Tetra(2-methoxy-ethanol)-silane | - | - | - | - | 0.04 | - | - | - | - |
V 93 | - | - | - | - | - | 2.33 | - | - | |
V 24 | - | - | - | - | - | - | 0.24 | - | |
Ethyltri-acetoxysilane | - | - | - | - | - | - | - | 0.32 | - |
Methyltris(methylethyl-ketoximino)silane | - | - | - | - | - | - | - | - | 0.32 |
Dibutyltin diacetate | 0.37 | 0.37 | 0.37 | 0.40 | 0.20 | - | - | 0.001 | 0.01 |
OL | - | - | - | - | - | 0.06 | 0.10 | - | |
GF 91 | - | 0.35 | - | - | - | - | - | 0.27 | |
HF 86 | - | - | 0.35 | - | - | - | 0.20 | - | |
Isoparaffin | 80.0 | 80.7 | 80.7 | 85.3 | 79.8 | 78.2 | - | 91.0 | 91.0 |
Layer weight [g/m2] | 4.3 | 4.1 | 4.3 | 2.8 | 3.8 | 2.9 | 2.1 | 2.5 | 2.3 |
Claims (14)
- Recording material havinga plate- or sheet-like substrate,a top layer comprising a cured silicone rubber, andat least one IR-absorbing layer which comprises at least one IR-absorbing component and at least one polymeric, organic binder arid decomposes under the action of IR laser radiation or changes so that its adhesion to the silicone top layer decreases, and
- Recording material according to Claim 1, characterized in that the substrate is mechanically, chemically and/or electrochemically roughened.
- Recording material according to Claim 1 or 2, characterized in that the layer of the oxide is produced electrochemically.
- Recording material according to Claim 3, characterized in that the oxide layer is porous.
- Recording material according to any of Claims 1 to 4, characterized in that the weight of the oxide layer is from 0.5 to 10 g/m2.
- Recording material according to Claims 5, characterized in that the weight of the oxide layer is from 1 to 5 g/m2
- Recording material according to any of Claims 1 to 6, characterized in that the IR-absorbing component is a pigment, a dye, a metallic element or carbon black.
- Recording material according to any of Claims 1 to 7, characterized in that the IR-absorbing layer contains a directly or indirectly thermally decomposable binder.
- Recording material according to Claim 8, characterized in that the directly thermally decomposable binder is nitrocellulose.
- Recording material according to any of Claims 1 to 9, characterized in that the weight of the IR-absorbing layer is from 0.15 to 5 g/m2.
- Recording material according to Claim 10, characterized in that the weight of the IR-absorbing layer is from 0.5 to 3.5 g/m2
- Process for the production of a waterless offset printing plate, characterized in that IR laser radiation is allowed to act imagewise on the recording material according to any of Claims 1 to 11 and those parts of the IR-absorbing layer struck by the radiation are thus removed together with those parts of the top layer which are present on top.
- Process according to Claim 12, characterized in that any adhering loose layer components are removed mechanically, optionally with the use of a solvent.
- Waterless offset printing plate, characterized in that it is produced from a recording material according to any of Claims 1 to 11.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98904059A EP0952926B1 (en) | 1997-01-17 | 1998-01-08 | Laser-imageable recording material and printing plate produced therefrom for waterless offset printing |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97200144 | 1997-01-17 | ||
EP97200144 | 1997-01-17 | ||
PCT/EP1998/000146 WO1998031550A1 (en) | 1997-01-17 | 1998-01-08 | Laser-imageable recording material and printing plate produced therefrom for waterless offset printing |
EP98904059A EP0952926B1 (en) | 1997-01-17 | 1998-01-08 | Laser-imageable recording material and printing plate produced therefrom for waterless offset printing |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0952926A1 EP0952926A1 (en) | 1999-11-03 |
EP0952926B1 true EP0952926B1 (en) | 2002-01-23 |
Family
ID=8227939
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98904059A Expired - Lifetime EP0952926B1 (en) | 1997-01-17 | 1998-01-08 | Laser-imageable recording material and printing plate produced therefrom for waterless offset printing |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0952926B1 (en) |
JP (1) | JP2001508001A (en) |
DE (1) | DE69803545T2 (en) |
WO (1) | WO1998031550A1 (en) |
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DE19908528A1 (en) * | 1999-02-26 | 2000-08-31 | Agfa Gevaert Ag | Radiation-sensitive recording material for the production of waterless offset printing plates |
US6132933A (en) * | 1999-07-30 | 2000-10-17 | American Dye Source, Inc. | Thermal waterless lithographic printing plates |
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EP3222435B1 (en) * | 2014-11-20 | 2021-11-24 | Toray Industries, Inc. | Method for manufacturing printed matter |
US20170136799A1 (en) | 2015-11-18 | 2017-05-18 | Kevin Ray | Dry lithographic imaging and printing with printing members having aluminum substrates |
EP3568301A1 (en) * | 2017-01-11 | 2019-11-20 | Presstek LLC | Ablation-type lithographic printing members having improved exposure sensitivity and related methods |
WO2020004227A1 (en) * | 2018-06-27 | 2020-01-02 | 東レ株式会社 | Lithographic printing original plate, method for manufacturing lithographic printing plate, and method for manufacturing prints using same |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1489308A (en) * | 1974-03-18 | 1977-10-19 | Scott Paper Co | Laser imagable dry planographic printing plate blank |
JPH0359558A (en) * | 1989-07-28 | 1991-03-14 | Konica Corp | Production of damping-waterless photosensitive planographic printing plate |
JPH03159793A (en) * | 1989-11-17 | 1991-07-09 | Toppan Printing Co Ltd | Planographic printing plate and plate making method |
GB9214304D0 (en) * | 1992-07-06 | 1992-08-19 | Du Pont Uk | Improvements in or relating to image formation |
AU674518B2 (en) * | 1992-07-20 | 1997-01-02 | Presstek, Inc. | Lithographic printing plates for use with laser-discharge imaging apparatus |
JPH09315024A (en) * | 1996-05-24 | 1997-12-09 | Fuji Photo Film Co Ltd | Original plate of planographic printing dispensing with dampening water |
-
1998
- 1998-01-08 WO PCT/EP1998/000146 patent/WO1998031550A1/en active IP Right Grant
- 1998-01-08 JP JP53230498A patent/JP2001508001A/en active Pending
- 1998-01-08 EP EP98904059A patent/EP0952926B1/en not_active Expired - Lifetime
- 1998-01-08 DE DE69803545T patent/DE69803545T2/en not_active Expired - Lifetime
Also Published As
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JP2001508001A (en) | 2001-06-19 |
DE69803545T2 (en) | 2002-08-08 |
EP0952926A1 (en) | 1999-11-03 |
DE69803545D1 (en) | 2002-03-14 |
WO1998031550A1 (en) | 1998-07-23 |
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