EP0978375B1 - Strahlungsempfindliches Gemisch mit IR-absorbierenden, anionischen Cyaninfarbstoffen und damit hergestelltes Aufzeichnungsmaterial - Google Patents
Strahlungsempfindliches Gemisch mit IR-absorbierenden, anionischen Cyaninfarbstoffen und damit hergestelltes Aufzeichnungsmaterial Download PDFInfo
- Publication number
- EP0978375B1 EP0978375B1 EP99114553A EP99114553A EP0978375B1 EP 0978375 B1 EP0978375 B1 EP 0978375B1 EP 99114553 A EP99114553 A EP 99114553A EP 99114553 A EP99114553 A EP 99114553A EP 0978375 B1 EP0978375 B1 EP 0978375B1
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- Prior art keywords
- radiation
- recording material
- layer
- weight
- groups
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- 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.)
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- 0 C*[N+]c1ccccc1C(C)(C)*/C=C/C=C/C=C/C=C(\C1(C)C)/N(*C)c2c1cccc2 Chemical compound C*[N+]c1ccccc1C(C)(C)*/C=C/C=C/C=C/C=C(\C1(C)C)/N(*C)c2c1cccc2 0.000 description 1
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
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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
- B41C1/1016—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2201/00—Location, type or constituents of the non-imaging layers in lithographic printing formes
- B41C2201/02—Cover layers; Protective layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2201/00—Location, type or constituents of the non-imaging layers in lithographic printing formes
- B41C2201/14—Location, type or constituents of the non-imaging layers in lithographic printing formes characterised by macromolecular organic compounds, e.g. binder, adhesives
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- 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
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- 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
- B41C2210/06—Developable by an alkaline solution
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- 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
- B41C2210/20—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by inorganic additives, e.g. pigments, salts
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- 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
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- 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
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- 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
- B41C2210/26—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 not involving carbon-to-carbon unsaturated bonds
- B41C2210/262—Phenolic condensation polymers, e.g. novolacs, resols
Definitions
- the invention relates to a positive-working, radiation-sensitive mixture, which is insoluble in water but soluble in aqueous alkaline solution, organic polymeric binder and an IR absorbing dye or Contains pigment.
- a recording material with a Carrier and a layer of this mixture and a method for producing it lithographic printing plates from the recording material.
- the Layer has a high sensitivity in the IR range, so that the Recording material for direct thermal imaging after the Computer-to-plate (CTP) process is suitable.
- the recording material according to WO 96/20429 includes a layer IR-absorbing carbon black pigments, 1,2-naphthoquinone-2-diazide sulfonic acid ester or carboxylic acid esters and a phenolic resin.
- the 1,2-naphthoquinone-2-diazide sulfonic acid or carboxylic acid can also directly with the hydroxyl groups Phenolic resin be esterified.
- the layer is first completely covered with UV rays and then exposed imagewise with IR laser beams. Through the Exposure to IR rays affects certain areas caused by UV radiation solubilized layer again insoluble. So it's about a negative working system. The processing of the material is therefore relative consuming.
- a negative working mixture is also described in EP-A 0 784 233, the a) novolak and / or polyvinylphenol, b) amino compounds to Curing component a), c) a cyanine and / or polymethine dye which absorbed in the near IR range, and d) contains photochemical acid generators.
- EP-A 903 225 is a light-sensitive preparation known to be a positive or when exposed to infrared rays forms a negative picture, and that from a acid-decomposable compound, an acid-crosslinking compound, an IR absorber and a polymer.
- WO 97/39894 describes layers that inhibit solutions Additives included.
- the additives reduce the solubility of the layer in aqueous alkaline Developers in the unexposed areas.
- these additives are especially cationic Compounds, especially dyes and cationic IR absorbers, such as quinoline cyanine dyes, Benzothiazole cyanine dyes or merocyanines.
- layers are heated to 50 to 100 ° C for 5 to 20 s, so they lose Add their inhibitory effect and the layer becomes more soluble in aqueous alkaline Solutions.
- the positive working mixture disclosed in EP-A 0 823 327 contains as an IR absorber Cyanine, polymethine, squarylium, croconium, pyrylium or Thiopyrylium dyes. Most of these dyes are cationic and show an inhibitory effect. In addition, many of them contain halogen. Under unfavorable conditions, environmentally harmful decomposition products can result arise. However, some are also revealed as Betainic as well an anionic dye (Compound S-9 on page 7). After layer drying causes this anionic dye due to its high number However, sulfonate groups generally crystallize out or precipitate out Layer components, which leads to significantly poorer properties of the IR-sensitive Shift leads and also causes a lack of layer cosmetics.
- the disadvantage of the layer compositions known from the prior art is that the increase in solubility caused by reheating is reached, is reversible after storage at room temperature. Will one Pressure plate not immediately after heating (e.g. heating cabinet) processed, so the development properties change what Reproduction problems when processing the recording materials can lead. In addition, many cationic additives contain halogen, so that under unfavorable conditions environmentally harmful decomposition products can arise.
- the object of the invention was a radiation-sensitive mixture and a To provide recording material of the type described in the introduction, the neither diazonium compounds nor thermosetting or acid-curing amino compounds, but also contains no silver halide compounds and besides an imagewise exposure and development no additional work step such as post-heating or post-exposure. Compared to daylight, that's supposed to Recording material to be practically insensitive.
- Z 1 and Z 2 are preferably isopropylidene groups, ie groups of the formula -C (CH 3 ) 2 -.
- Preferred cations are alkali and alkaline earth cations, especially sodium and Potassium ions, as well as ammonium ions or mono-, di-, tri- or tetraalkylammonium ions.
- dyes with a symmetrical structure i.e. those in which the (Partially) aromatic radicals in the formula (I) are substituted in the same way. she are also easier to access synthetically. Are therefore particularly cheap Dyes that contain two sulfonate groups.
- the dyes of the formula (I) surprisingly do not have any solubility-inhibiting effect on the Mixture or a layer made of it.
- the (C 1 -C 4 ) alkoxy group mentioned is preferably a methoxy or ethoxy group, while the (C 7 -C 16 ) aralkyl group is preferably a benzyl group.
- the halogen atoms are generally chlorine, bromine or iodine atoms.
- R 9 and R 10 each represent a group of the formula - [CH 2 ] n -SO 3 -, where n is an integer from 1 to 6.
- one of the groups R 1 to R 4 or R 5 to R 8 each represents a sulfonate group.
- the IR-absorbing, anionic cyanine dyes F1 to F4 listed below are particularly suitable in the mixture according to the invention (the cationic cyanine dye F5 was used for comparison purposes and is therefore marked with *).
- the proportion of the IR absorbing dye is generally 0.2 to 30 % By weight, preferably 0.5 to 20% by weight, particularly preferably 0.6 to 10% by weight, each based on the total weight of the solids of the mixture.
- suitable IR absorbing dyes can not only be narrow IR ranges are used, but the entire wavelength range of the near IR spectrum. To cover the IR range from 700 to 1200 nm, in particular from 800 to 1100 nm, are usually at least two IR-absorbing Dyes required.
- the organic, polymeric binder is preferably a binder having acidic groups whose pK s value of less than. 13 This ensures that the layer is soluble or at least swellable in aqueous alkaline developers.
- the binder is a polymer or polycondensate, for example a polyester, polyamide, polyurethane or polyurea.
- polycondensates and polymers with free phenolic hydroxyl groups such as are obtained, for example, by reacting phenol, resorcinol, a cresol, a xylenol or a trimethylphenol with aldehydes - especially formaldehyde - or ketones.
- Condensation products of sulfamoyl- or carbamoyl-substituted aromatics and aldehydes or ketones are also suitable.
- Polymers of bis-methylol-substituted ureas, vinyl ethers, vinyl alcohols, vinyl acetals or vinyl amides as well as polymers of phenyl acrylates and copolymers of hydroxyphenyl-maleimides are also suitable.
- Polymers with units of vinyl aromatics, N-aryl- (meth) acrylamides or aryl- (meth) acrylates may also be mentioned, where these units may each have one or more carboxy groups, phenolic hydroxyl groups, sulfamoyl or carbamoyl groups.
- the polymers can additionally contain units from other monomers which have no acidic units. Such units are vinyl aromatics, methyl (meth) acrylate, phenyl (meth) acrylate, benzyl (meth) acrylate, methacrylamide or acrylonitrile.
- (meth) acrylate stands for acrylate and / or methacrylate. The same applies to "(meth) acrylamide”.
- the proportion of the binder is generally 40 to 99.8% by weight, preferably 70 to 99.4% by weight, particularly preferably 80 to 99% by weight, in each case based on the total weight of the non-volatile components of the mixture.
- the polycondensation product is a Novolak, preferably a cresol / formaldehyde or a cresol / xylenol / formaldehyde novolak, the proportion of novolak preferably being at least 50% by weight is at least 80% by weight, based in each case on the total weight of all Binder.
- the properties of the mixture according to the invention can also through finely divided, non-inhibitory, soluble or dispersible dyes, that practically do not absorb, influence or control in the IR range become.
- the proportion of additional where necessary Dyes present in a mixture is generally 0.01 to 30% by weight, preferably 0.05 to 10% by weight, in each case based on the total weight of the non-volatile components of the mixture.
- the mixture can contain other additives do not have a layer-inhibiting effect, e.g. Carbon black pigments as additional IR absorbers, Surfactants (preferably fluorine-containing surfactants or silicone surfactants), Polyalkylene oxides to control the acidity of the acidic units and low molecular weight Compounds with acidic units to increase the rate of development.
- the mixture does not contain any ingredients Exposure to radiation in the ultraviolet or visible range of the Spectrum could have an impact on daylight sensitivity.
- Binder and IR-absorbing, anionic cyanine dye are common as a mixture, but can also form separate layers. Through the separate arrangement of binder and IR-absorbing, anionic dyes can often have increased photosensitivity and better stability compared to aqueous alkaline developer solutions.
- the dye layer is generally over the binder layer. Due to the hardness of the dye layer, the sensitivity is at the same time the surface of the recording material is reduced.
- the dye layer consists in this embodiment preferably alone or several of the anionic cyanine dyes. The above, only if necessary existing non-IR-sensitive dyes are in the one below lying binder layer.
- the present invention furthermore relates to a recording material with a layer support and a positive-working, IR-sensitive layer, which is characterized in that the layer consists of the mixture described.
- the mixture according to the invention can also be used for other purposes, for example as a photoresist.
- Another object of the invention is a recording material with a support, a layer which consists predominantly or entirely of at least one of the binders mentioned and a layer which consists essentially of at least one of the IR-absorbing, anionic dyes described or a mixture of these dyes Triarylmethane, azine, oxazine, thiazine and / or xanthene dyes (in the order given).
- the dye layer can also contain matting particles, for example SiO 2 particles or pigments. Additives to improve uniformity can also be found in minor amounts.
- the invention is used to produce the recording material Mixture dissolved in a solvent mixture that with the components of the Mixture does not react irreversibly.
- the solvent is on the intended Coating process, the layer thickness, the composition of the layer, and to coordinate the drying conditions.
- chlorinated hydrocarbons such as trichlorethylene or 1,1,1-trichloroethane
- Mixtures can also be used which also use solvents such as acetonitrile, dioxane, May contain dimethylacetamide, dimethyl sulfoxide or water.
- solvents such as acetonitrile, dioxane, May contain dimethylacetamide, dimethyl sulfoxide or water.
- the double layer can for the both coating processes the same or different solvents be used.
- the support in the recording material according to the invention is preferably an aluminum foil or a composite of an aluminum and a Polyester film.
- the aluminum surface is preferably roughened, anodized and with a compound having at least one phosphonic acid or phosphonate unit contains, hydrophilized. Before roughening, degreasing and Pickling with bases and mechanical and / or chemical pre-roughening respectively.
- the thickness of the IR sensitive layer is generally 1.0 to 5.0 ⁇ m, preferably 1.5 to 3.0 ⁇ m.
- the thickness of the binder layer is generally 1.0 to 5.0 ⁇ m, preferably 1.5 to 3.0 ⁇ m, while the dye layer compared is significantly thinner and generally a thickness of only 0.01 to 0.3 ⁇ m is preferred 0.015 to 0.10 microns.
- a top layer can also be applied become. It generally consists of at least one water-soluble polymeric binders such as polyvinyl alcohol, polyvinyl pyrrolidone, partially saponified Polyvinyl acetates, gelatin, carbohydrates or hydroxyethyl cellulose and will prepared from an aqueous solution or dispersion, which if necessary small amounts, i.e. less than 5% by weight based on the total weight the coating solvent for the top layer, on organic solvents may contain.
- the thickness of the cover layer is up to 5.0 ⁇ m, preferably 0.1 to 3.0 ⁇ m, particularly preferably 0.15 to 1.0 ⁇ m.
- the present invention also relates to a method for Production of a planographic printing form in which the recording material according to the invention irradiated imagewise with infrared radiation and then in a conventional aqueous alkaline developer at a temperature of 20 to 40 ° C is developed.
- a conventional aqueous alkaline developer at a temperature of 20 to 40 ° C is developed.
- the water-soluble that may be present Cover layer also removed.
- Silicate-based developers which have a ratio of SiO 2 to alkali oxide of at least 1 are preferred. This ensures that the aluminum oxide layer of the carrier is not damaged.
- Preferred alkali oxides are Na 2 O and K 2 O, and mixtures thereof.
- the developer can contain further components, such as buffer substances, complexing agents, defoamers, organic solvents in small amounts, corrosion inhibitors, dyes, surfactants and / or hydrotropes.
- Alkali silicate solutions are used for regeneration used with alkali contents from 0.6 to 2.0 mol / l. These solutions can have the same silica / alkali ratio as the developer own (usually it is lower) and also contain other additives.
- the required amounts of regrind must be based on the used Development devices, daily plate throughputs, image parts etc. coordinated are and are generally 1 to 50 ml per square meter of recording material. The addition can be regulated, for example, via the conductance measurement take place as described in EP-A 0 556 690.
- the recording material according to the invention can then, if necessary post-treated with suitable correcting agents or preservatives become.
- a basic recipe consisting of 1a * 4.87 Gt meta- / para- cresol / formaldehyde novolak, 20.00 pbw Ethylene glycol monoalkyl ether / methyl ethyl ketone (6: 4) and 2.00 pbw distilled water, to which one of the following dyes was added: 1b * 0.04 pbw cationic cyanine dye F 5 *, 1c 0.04 pbw anionic cyanine dye F 1, 1d 0.04 pbw anionic cyanine dye F 2, 1e 0.04 pbw anionic cyanine dye F 3, 1f * 0.04 pbw ®Flexoblau 630, a cationic dye from BASF AG,
- the coating solutions thus prepared were roughened in hydrochloric acid, anodized in sulfuric acid and hydrophilized with polyvinylphosphonic acid Aluminum foils applied. After drying at 100 ° C. for 2 min Layer thickness at 1.9 +/- 0.1 ⁇ m.
- Development was carried out in a cuvette at a temperature of 23 ° C. using a potassium silicate developer containing K 2 SiO 3 (normality 0.8 mol / l in water) and 0.2% by weight of O, O ' bis-carboxymethyl polyethylene glycol-1000 and 0.4 wt .-% pelargonic acid contained.
- the development time was 30 to 360 seconds.
- the table shows that in Examples 1b * and 1f * the layer removal in Compared to example 1a * is reduced, i.e. that the cationic cyanine dye F5 * as well as the Flexoblau 630 have a solubility-inhibiting effect on the Exercise shift.
- the anionic cyanine dyes in the invention Examples 1c, 1d, 1e and 1g result in increased layer removal by the aqueous alkaline developer.
- Table 1c shows that only Comparative Example 1b *, which is a cationic IR-absorbing dye contains an increase in solubility after reheating experienced in an aqueous alkaline developer. In example 1f * however, the solubility-inhibiting effect is retained.
- the coating solutions were roughened in hydrochloric acid, in sulfuric acid anodized aluminum foils hydrophilized with polyvinylphosphonic acid applied. After drying for 2 min at 100 ° C, the layer thickness was 2 ⁇ m.
- Table 3 shows the image reproduction of halftone dots of a test wedge. number Play the percentage grid points Rendering of the open grid depths 2a * no stay no stay 2 B* 4 97 2c 3 98 2d 3 99 2e 2 98
- a coating solution was made from 0.60 pbw meta- / para- cresol / formaldehyde novolak, 0.10 pbw F 2, 6.00 pbw Tetrahydrofuran and 4.00 pbw Ethylene glycol monoalkyl.
- Example 3a The solution was either used as such (Example 3a) or it was 0.20 pbw of an esterification product from 1 mol 2,3,4-trihydroxybenzophenone and 1.5 mol of 1,2-naphthoquinone-2-diazide-5-sulfonyl chloride were added (example 3b *).
- the coating solutions without or with diazo compound were dissolved in hydrochloric acid roughened, anodized in sulfuric acid and with polyvinylphosphonic acid hydrophilized aluminum foils applied. After drying for 2 min 100 ° C the layer thickness was 2 ⁇ m.
- the recording materials were then exposed in an outer drum imagesetter exposed to infrared radiation.
- an Nd-YAG laser with a wavelength was used of 1064 nm and a power of 7.0 W, a write speed of 120 rpm and a beam width of 10 ⁇ m (before the IR exposure were the plates 0 minutes, 1 hour, 1 day or 1 week Exposed to daylight).
- Development was carried out in a conventional automatic processor at a throughput speed of 0.8 m / min and a temperature of 23 ° C. using a potassium silicate developer, the K 2 SiO 3 (normality 0.8 mol / l in water) and 0.2% by weight. -% O, O'-bis-carboxymethyl-polyethylene glycol-1000 and 0.4 wt .-% pelargonic acid contained. Developmental behavior after exposure to daylight number 0 min exposure 1 hour exposure 1 week exposure 3a By default By default By default 3b * By default total shift removal ----
- the table shows that the diazo-containing layer is completely developed was removed if daylight had previously been on the Recording material had acted.
- the recording material according to the invention was, however, insensitive to daylight and could also be still process easily if it is daylight for 1 week (or more) was exposed.
- This example shows the advantage of IR dyes with and without indicator dyes compared to soot-sensitive recording materials in Regarding mechanical surface attack.
- Coating solutions were made from 0.72 pbw meta / para cresol formaldehyde novolak, 0.10 pbw Copolymer of (2-hydroxyphenyl) methacrylate and methyl methacrylate (M w 4,000), 0.05 pbw 2,4-dihydroxy-benzophenone, 0.02 pbw Flexoblau 630 from BASF (only in layers 4b and 4d), 0.08 pbw F 3 (only in layers 4a and 4b), 0.04 pbw Carbon black pigment type HCC d. Grolman (only in layers 4c * and 4d *).
- the recording materials were then exposed in an outer drum imagesetter exposed to infrared radiation. This was also the case in the previous Examples used Nd-YAG lasers with a power of 7.0 W, one Writing speed of 120 rpm and a beam width of 10 ⁇ m used.
- the recording materials were subjected to a hardness tester pretreated.
- the contact pressure became as from the table clearly set.
- Table 5 shows the results after the recording materials were treated with the hardness tester. Depending on the mechanical sensitivity of the coating surface, traces of imprints (referred to in the table as "traces") appear on the material. example Impact on the impeller [N] 0.5 1 2 5 4a - traces traces traces 4b - - - traces 4c * traces traces traces traces 4d * - - traces traces
- Example 5 shows the influence of IR absorber mixtures on recording materials.
- a coating solution was made from 0.85 pbw meta - / para- cresol / formaldehyde novolak, 0.06 pbw Styrene / acrylate copolymer (M w 6,500; acid number 205), 4.50 pbw tetrahydrofuran, 1.80 pbw Ethylene glycol monomethyl ether and 2.70 pbw Methanol.
- the respective coating solutions were applied to aluminum foils, which was previously roughened in hydrochloric acid, anodized in sulfuric acid and with Polyvinylphosphonic acid had been hydrophilized. After drying for 2 min 100 ° C the layer thickness was 2 ⁇ m.
- the table shows that by appropriately mixing IR absorbers Sensitization in the entire range from 830 nm to 1064 nm is possible.
- a coating solution was made from 4.87 Gt meta - / para- cresol / formaldehyde novolak, 20.00 pbw Ethylene glycol monomethyl ether and 2.00 pbw Butanone.
- the solution was applied to the support described in Example 5 and dried (2 min; 100 ° C). The layer thickness was then 2 ⁇ m.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials For Photolithography (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
- Printing Plates And Materials Therefor (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
Description
- n
- 2 oder 3 ist,
- R1 bis R8
- unabhängig voneinander ein Wasserstoff- oder Halogenatom, eine Sulfonat-, Carboxylat-, Phosphonat-, Hydroxy-, (C1-C4)Alkoxy-, Nitro-, Amino-, (C1-C4)Alkylamino-, Di(C1-C4)alkylaminogruppe oder eine (C6-C10)Arylgruppe, die gegebenenfalls ihrerseits mit einem oder mehreren Halogenatomen und/oder einer oder mehreren Sulfonat-, Carboxylat-, Phosphonat-, Hydroxy-, (C1-C4)Alkoxy-, Nitro-, Amino-, (C1-C4)Alkylamino- und/oder Di-(C1-C4)alkylaminogruppen substituiert ist, darstellen,
- R9 und R10
- unabhängig voneinander eine geradkettige oder verzweigte (C1-C6)Alkyl-, eine (C7-C16)Aralkyl- oder eine (C6-C10)Arylgruppe, die jeweils gegebenenfalls ihrerseits mit einem oder mehreren Halogenatomen und/oder einer oder mehreren Sulfonat-, Carboxylat-, Phosphonat-, Hydroxy-, (C1-C4)Alkoxy-, Nitro-, Amino-, (C1-C4)Alkylamino- und/oder Di(C1-C4)alkylaminogruppen substituiert sind, darstellen,
- Z1 und Z2
- unabhängig voneinander ein Schwefelatom, eine Di(C1-C4)alkylmethylengruppe oder eine Ethen-1,2-diylgruppe darstellen und
- X+
- ein Kation darstellt,
1a* | 4,87 Gt | meta-/para-Cresol/Formaldehyd-Novolak, |
20,00 Gt | Ethylenglykolmonoalkylether / Methylethylketon (6:4) und | |
2,00 Gt | destilliertes Wasser, |
1b* | 0,04 Gt | kationischer Cyaninfarbstoff F 5*, |
1c | 0,04 Gt | anionischer Cyaninfarbstoff F 1, |
1d | 0,04 Gt | anionischer Cyaninfarbstoff F 2, |
1e | 0,04 Gt | anionischer Cyaninfarbstoff F 3, |
1f* | 0,04 Gt | ®Flexoblau 630, ein kationischer Farbstoff der BASF AG, |
Küvettenentwicklungszeit [s] | Abtragsraten ohne Nacherwärmung [g/m2] | ||||||
1a* | 1b* | 1c | 1d | 1e | 1f* | 1g | |
30 | 0,02 | 0,01 | 0,11 | 0,09 | 0,10 | 0,05 | 0,05 |
60 | 0,11 | 0,05 | 0,29 | 0,23 | 0,23 | 0,07 | 0,18 |
120 | 0,34 | 0,23 | 0,68 | 0,48 | 0,51 | 0,18 | 0,45 |
240 | 0,59 | 0,43 | 1,12 | 0,81 | 0,91 | 0,60 | 0,86 |
360 | 0,96 | 0,61 | 1,81 | 1,43 | 1,85 | 0,81 | 1,51 |
Küvettenentwicklungszeit [s] |
Abtragsrate nach 20 s Nacherwärmung bei 50°C | |
1b* | 1f* | |
30 | 0,05 | 0,02 |
60 | 0,15 | 0,03 |
120 | 0,44 | 0,18 |
240 | 0,85 | 0,52 |
360 | 1,21 | 0,75 |
Küvettenentwicklungszeit [s] | Abtragsrate nach 5 s bei 160°C | Abtragsrate nach 20 s bei 160°C | ||
1b* | 1f* | 1b* | 1f* | |
30 | 0,10 | 0,01 | 0,10 | 0,01 |
60 | 0,20 | 0,05 | 0,19 | 0,04 |
120 | 0,28 | 0,19 | 0,36 | 0,22 |
240 | 0,65 | 0,60 | 0,98 | 0,59 |
360 | 1,09 | 0,73 | 1,46 | 0,70 |
0,87 Gt | meta-/para-Cresol/Formaldehyd-Novolak, |
0,10 Gt | Polyhydroxystyrol (Mw 4.000), |
4,50 Gt | Tetrahydrofuran, |
1,80 Gt | Ethylenglykol-monomethylether, |
2,70 Gt | Methanol und |
0,03 Gt | des jeweiligen IR-Absorbers (siehe Tabelle 2). |
Nummer | IR-Absorber |
2a* | Ohne Absorber |
2b* | Rußpigment Typ HCC d.Fa. Grolman |
2c | F1 |
2d | F2 |
2e | F3 |
Nummer | Wiedergabe der Prozentrasterpunkte | Wiedergabe der offenen Rastertiefen |
2a* | keine Aufentwicklung | keine Aufentwicklung |
2b* | 4 | 97 |
2c | 3 | 98 |
2d | 3 | 99 |
2e | 2 | 98 |
0,60 Gt | meta-/para-Cresol/Formaldehyd-Novolak, |
0,10 Gt | F 2, |
6,00 Gt | Tetrahydrofuran und |
4,00 Gt | Ethylenglykolmonoalkylether. |
Entwicklungsverhalten nach Einwirkung von Tageslicht | |||
Nummer | 0 min Einwirkung | 1 h Einwirkung | 1 Woche Einwirkung |
3a | standardmäßig | standardmäßig | standardmäßig |
3b* | standardmäßig | totaler Schichtabtrag | ---- |
0,72 Gt | meta-/ para-Kresol-Formaldehyd-Novolak, |
0,10 Gt | Copolymer aus (2-Hydroxy-phenyl)-methacrylat und Methylmethacrylat (Mw 4.000) , |
0,05 Gt | 2,4-Dihydroxy-benzophenon, |
0,02 Gt | Flexoblau 630 der Fa. BASF (nur in den Schichten 4b und 4d), |
0,08 Gt | F 3 (nur in den Schichten 4a und 4b), |
0,04 Gt | Rußpigment Typ HCC d. Fa. Grolman (nur in den Schichten 4c* und 4d*). |
Beispiel | Einwirkende Kraft auf das Laufrad [N] | |||
0,5 | 1 | 2 | 5 | |
4a | - | Spuren | Spuren | Spuren |
4b | - | - | - | Spuren |
4c* | Spuren | Spuren | Spuren | Spuren |
4d* | - | - | Spuren | Spuren |
0,85 Gt | meta-/para-Cresol/Formaldehyd-Novolak, |
0,06 Gt | Styrol/Acrylat-Copolymer (Mw 6.500; Säurezahl 205), |
4,50 Gt | Tetrahydrofuran, |
1,80 Gt | Ethylenglykol-monomethylether und |
2,70 Gt | Methanol. |
0,04 Gt | Farbstoff F 1 (Beispiel 5a) oder |
0,04 Gt | Farbstoff F 1 und |
0,04 Gt | Rußpigment Typ HCC d. Fa. Grolman (Beispiel 5b) oder |
0,04 Gt | Rußpigment Typ HCC der Firma Grolman (Beispiel 5c*). |
Beispiel | Entwicklungsverhalten nach Laserbelichtung bei 830 nm | Entwicklungsverhalten nach Laserbelichtung bei 1064nm |
5a | gerade Hintergrund frei | nicht entwickelbar |
5b | Hintergrund frei | Hintergrund frei |
5c* | Hintergrund frei | Hintergrund frei |
4,87 Gt | meta-/para-Cresol/Formaldehyd-Novolak, |
20,00 Gt | Ethylenglykol-monomethylether und |
2,00 Gt | Butanon. |
Claims (16)
- Positiv arbeitenden, strahlungsempfindlichen Gemisch, das ein in Wasser unlösliches, in wäßrig-alkalischer Lösung dagegen lösliches oder zumindest quellbares, organisches, polymeres Bindemittel und mindestens einen IR-absorbierenden Farbstoff enthält, dadurch gekennzeichnet, daß der IR-absorbierende Farbstoff ein anionischer Cyaninfarbstoff der Formel (I) ist worin
- n
- 2 oder 3 ist,
- R1 bis R8
- unabhängig voneinander ein Wasserstoff- oder Halogenatom, eine Sulfonat-, Carboxylat-, Phosphonat-, Hydroxy-, (C1-C4) Alkoxy-, Nitro-, Amino-, (C1-C4)Alkylamino-, Di(C1-C4)alkylaminogruppe oder eine (C6-C10)Arylgruppe, die ggf. ihrerseits mit einem oder mehreren Halogenatom/en und/oder einer oder mehreren Sulfonat-, Carboxylat-, Phosphonat-, Hydroxy-, (C1-C4)Alkoxy-, Nitro-, Amino-, (C1-C4)Alkylamino- und/oder Di(C1-C4)alkylaminogruppen substituiert ist, darstellen,
- R9 und R10
- unabhängig voneinander eine geradkettige oder verzweigte (C1-C6)Alkyl-, eine (C7-C16)Aralkyl- oder eine (C6-C10)Arylgruppe, die jeweils ggf. ihrerseits mit einem oder mehreren Halogenatom/en und/oder einer oder mehreren Sulfonat-, Carboxylat-, Phosphonat-, Hydroxy-, (C1-C4)Alkoxy-, Nitro-, Amino-, (C1-C4)Alkylamino- und/oder Di(C1-C4)alkylaminogruppen substituiert sind, darstellen,
- Z1 und Z2
- unabhängig voneinander ein Schwefelatom, eine Di(C1-C4) alkyl-methylengruppe oder eine Ethen-1,2-diylgruppe darstellen und
- X+
- ein Kation darstellt,
- Strahlungsempfindliches Gemisch gemäß Anspruch 1, dadurch gekennzeichnet, daß das Kation ein Alkali- oder Erdalkali-Kation, bevorzugt ein Natrium- oder Kaliumion, ein Ammoniumion oder ein Mono-, Di-, Tri- oder Tetraalkylammoniumion, ist.
- Strahlungsempfindliches Gemisch gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Bindemittel acide Gruppen mit einem pKs-Wert von weniger 13 enthält.
- Strahlungsempfindliches Gemisch gemäß Anspruch 3, dadurch gekennzeichnet, daß das Bindemittel ein Polykondensationsprodukt ist aus Phenolen oder sulfamoyl- oder carbamoyl-substituierten Aromaten mit Aldehyden oder Ketonen, ein Umsetzungsprodukt von Diisocyanaten mit Diolen oder Diaminen oder ein Polymer mit Einheiten aus Vinylaromaten, N-Aryl-(meth)-acrylamiden oder Aryl-(meth)acrylaten, wobei diese Einheiten jeweils noch eine oder mehrere Carboxygruppen, phenolische Hydroxygruppen, Sulfamoyl- oder Carbamoylgruppen enthalten.
- Strahlungsempfindliches Gemisch gemäß Anspruch 3, dadurch gekennzeichnet, daß das Polykondensationsprodukt ein Novolak ist, bevorzugt ein Cresol/Formaldehyd- oder ein Cresol/Xylenol/Formaldehyd-Novolak, wobei der Anteil an Novolak bevorzugt mindestens 50 Gew.-%, besonders bevorzugt mindestens 80 Gew.-%, bezogen auf das Gesamtgewicht aller Bindemittel, beträgt.
- Strahlungsempfindliches Gemisch gemäß einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Anteil des Bindemittels 40 bis 99,8 Gew.-%, bevorzugt 70 bis 99,4 Gew.-%, besonders bevorzugt 80 bis 99 Gew.-%, beträgt, jeweils bezogen auf das Gesamtgewicht der nichtflüchtigen Bestandteile des Gemisches.
- Strahlungsempfindliches Gemisch gemäß einem oder mehreren der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der IR-absorbierende Farbstoff nach einer kurzeitigen Nacherwärmung keinen Löslichkeitszuwachs bewirkt.
- Strahlungsempfindliches Gemisch gemäß einem oder mehreren der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der Anteil des IR-absorbierenden anionischen Cyaninfarbstoffs 0,2 bis 30 Gew.-%, bevorzugt 0,5 bis 20 Gew.-%, besonders bevorzugt 0,6 bis 10 Gew.-%, jeweils bezogen auf das Gesamtgewicht der Feststoffe des Gemisches, beträgt.
- Strahlungsempfindliches Gemisch gemäß einem oder mehreren der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß es zur Abdeckung des nahen IR-Wellenlängenbereichs, d.h. des IR-Bereiches von 700 bis 1200 nm, insbesondere von 800 bis 1100 nm, zwei oder mehr verschiedene anionische Cyaninfarbstoffe der Formel I enthält.
- Strahlungsempfindliches Gemisch gemäß einem oder mehreren der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß es zusätzlich ein Rußpigment enthält.
- Aufzeichnungsmaterial mit einem Träger und einer strahlungsempfindlichen Schicht, dadurch gekennzeichnet, daß die Schicht aus einem strahlungsempfindlichen Gemisch gemäß einem oder mehreren der Ansprüche 1 bis 11 besteht.
- Aufzeichnungsmaterial mit einem Träger, einer Schicht, die im wesentlichen aus einem in Wasser unlöslichen, in wäßrig-alkalischer Lösung dagegen löslichen oder zumindest quellbaren, organischen, polymeren Bindemittel besteht, und einer Farbstoffschicht, dadurch gekennzeichnet, daß die Farbstoffschicht im wesentlichen aus mindestens einem der anionischen Cyaninfarbstoffe gemäß Anspruch 1 besteht.
- Aufzeichnungsmaterial gemäß Anspruch 11 oder 12, dadurch gekennzeichnet, daß sich auf der strahlungsempfindlichen Schicht bzw. auf der Farbstoffschicht eine Deckschicht aus mindestens einem wasserlöslichem polymeren Bindemittel befindet, wobei die Deckschicht eine Dicke von bis zu 5,0 µm, bevorzugt von 0,5 bis 3,0 µm, hat.
- Aufzeichnungsmaterial gemäß Anspruch 13, dadurch gekennzeichnet, daß das wasserlösliche polymere Bindmittel Polyvinylalkohol, Polyvinylpyrrolidon, teilverseiftes Polyvinylacetat, Gelatine, ein Kohlehydrat oder Hydroxyethylcellulose ist.
- Aufzeichnungsmaterial gemäß einem oder mehreren der Ansprüche 11 bis 13, dadurch gekennzeichnet, daß der Träger aus einer Aluminiumfolie besteht.
- Verfahren zur Herstellung einer Druckform, worin ein strahlungsempfindliches Aufzeichnungsmaterial gemäß den Ansprüchen mit Infrarotstrahlung bildmäßig bestrahlt und anschließend mit einer wäßrig-alkalischen Lösung entwickelt wird, dadurch gekennzeichnet, daß das Aufzeichnungsmaterial einem oder mehreren der Ansprüche 12 bis 15 entspricht.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE19834745 | 1998-08-01 | ||
DE19834745A DE19834745A1 (de) | 1998-08-01 | 1998-08-01 | Strahlungsempfindliches Gemisch mit IR-absorbierenden, anionischen Cyaninfarbstoffen und damit hergestelltes Aufzeichnungsmaterial |
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EP0978375A2 EP0978375A2 (de) | 2000-02-09 |
EP0978375A3 EP0978375A3 (de) | 2001-09-12 |
EP0978375B1 true EP0978375B1 (de) | 2004-10-20 |
Family
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EP99114553A Expired - Lifetime EP0978375B1 (de) | 1998-08-01 | 1999-07-24 | Strahlungsempfindliches Gemisch mit IR-absorbierenden, anionischen Cyaninfarbstoffen und damit hergestelltes Aufzeichnungsmaterial |
Country Status (4)
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US (1) | US6238838B1 (de) |
EP (1) | EP0978375B1 (de) |
JP (1) | JP2000206695A (de) |
DE (2) | DE19834745A1 (de) |
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US6004728A (en) * | 1997-10-08 | 1999-12-21 | Agfa-Gevaert, N.V. | Method for making positive working printing plates from a heat mode sensitive image element |
EP0908307B1 (de) * | 1997-10-08 | 2003-11-26 | Agfa-Gevaert | Verfahren zur Herstellung einer positiv arbeitenden Druckplatte aus einem Wärmeempfindlichen Bildaufzeichnungsmaterial |
-
1998
- 1998-08-01 DE DE19834745A patent/DE19834745A1/de not_active Withdrawn
-
1999
- 1999-07-24 DE DE59910884T patent/DE59910884D1/de not_active Expired - Fee Related
- 1999-07-24 EP EP99114553A patent/EP0978375B1/de not_active Expired - Lifetime
- 1999-07-29 US US09/362,861 patent/US6238838B1/en not_active Expired - Fee Related
- 1999-08-02 JP JP21920399A patent/JP2000206695A/ja active Pending
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US6238838B1 (en) | 2001-05-29 |
EP0978375A3 (de) | 2001-09-12 |
JP2000206695A (ja) | 2000-07-28 |
DE19834745A1 (de) | 2000-02-03 |
EP0978375A2 (de) | 2000-02-09 |
DE59910884D1 (de) | 2004-11-25 |
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