EP0441502B1 - Endbearbeitungslösung für lithographische Platten - Google Patents

Endbearbeitungslösung für lithographische Platten Download PDF

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Publication number
EP0441502B1
EP0441502B1 EP19910300533 EP91300533A EP0441502B1 EP 0441502 B1 EP0441502 B1 EP 0441502B1 EP 19910300533 EP19910300533 EP 19910300533 EP 91300533 A EP91300533 A EP 91300533A EP 0441502 B1 EP0441502 B1 EP 0441502B1
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EP
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Prior art keywords
plate
starch
acid
gum
salts
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EP19910300533
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English (en)
French (fr)
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EP0441502A3 (de
EP0441502B2 (de
EP0441502A2 (de
Inventor
Akira C/O Fuji Photo Film Co. Ltd. Nishioka
Hiroshi C/O Fuji Photo Film Co. Ltd. Matsumoto
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Fujifilm Holdings Corp
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Fuji Photo Film Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/08—Damping; Neutralising or similar differentiation treatments for lithographic printing formes; Gumming or finishing solutions, fountain solutions, correction or deletion fluids, or on-press development

Definitions

  • the present invention relates to a process for preparing a lithographic plate.
  • a gumming up step is performed as the final process.
  • a protecting agent i.e., so-called desensitizing gum is applied onto the surface of the printing plate. This is applied to the plate for the purposes of preventing adhesion of contaminants on the plate after the plate is manufactured and till the plate is set on a printing press to thereby prevent occurrence of background contamination on printed matters and for preventing the formation of defects on the plate surface during storing the plates in the heaped up state or upon hitting them against a foreign substance.
  • the most important purpose of the gumming up step is to prevent the lowering of the hydrophilic properties of non-image areas due to oxidization encountered when the plate surface is directly exposed to air and to enhance the hydrophilic properties thereof. For these reasons, the gumming up is a step indispensable for the plate making process.
  • a composition comprising an aqueous solution of gum arabic having a concentration ranging from about 15 to 30% by weight to which additives such as surfactants, pH-adjusting agents and preservatives are optionally added.
  • an emulsion gum solution comprising an oil phase containing a lipophilic surfactant, such as an organic solvent soluble lipophilic surfactant, dissolved in a petroleum fraction and a water phase containing a water soluble organic high molecular compound dissolved therein.
  • a lipophilic surfactant such as an organic solvent soluble lipophilic surfactant
  • a water phase containing a water soluble organic high molecular compound dissolved therein.
  • gum arabic serves as not only a desensitizing agent but also a protective colloid to stabilize the emulsion.
  • gum arabic is a natural substance which is produced only in limited regions in the world and its amount of harvest is greatly influenced by various factors such as the climate at the regions. Thus the stable supply thereof is not always expected.
  • J.P. KOKAI Japanese Patent Un-examined Publication
  • Sho 54-97102 B.P. 2010298 discloses dextrin, sterabic, arabogalactan, alginic acid salts, polyacrylic acids, hydroxyethyl cellulose, polyvinyl pyrrolidone, polyacrylamide, methyl cellulose, hydroxypropyl cellulose, hydroxymethyl cellulose and salts of carboxyalkyl celluloses.
  • J.P. KOKOKU Japanese Patent Publication for Opposition Purpose
  • Sho 54-41921 discloses pullulan and pullulan derivatives; J.P. KOKAI No.
  • Sho 58-197091 discloses polyvinyl pyrrolidone; and J.P. KOKAI No. Sho 56-133193 (U.S.P. 4,349,391) discloses polyvinyl alcohols. J.P.KOKAI No.
  • Sho 59-57242 discloses modified starch derivatives which include roasted starch such as British gum, enzyme-modified dextrin such as enzyme dextrin and Schardinger dextrin, acid-treated starch such as solubilized starch, oxidized starch such as dialdehyde starch, gelatinized starch such as modified or non-modified gelatinized starch, esterified starch such as phosphoric acid starch, fatty acid starch, sulfuric acid starch, nitric acid starch, xanthogenic acid starch and carbamic acid starch, etherified starch such as carboxyalkylated starch, hydroxyalkylated starch, sulfoalkylated starch, cyanoethylated starch, allylated starch, benzylated starch, carbamylethylated starch and dialkylamino starch, crosslinked starch such as methylol crosslinked starch, hydroxyalkyl crosslinked starch,
  • water-soluble organic polymeric compounds are inferior in the property of protective colloid to gum arabic and therefore, emulsion type gum solutions using the polymeric compounds undergo phase separation into oil and aqueous phases in a few days.
  • a non-emulsion type gum solution has been known.
  • the non-emulsion type gum solution using a large amount of gum arabic has disadvantages in that it is inferior in ink receptivity in image areas and that gum arabic is not stably supplied.
  • a non-emulsion type gum solution containing a water-soluble organic polymeric compound instead of gum arabic is sufficient in the ability of preventing contamination in non-image areas because it does not contain a lipophilic component, but it is insufficient in ink receptivity in image areas so that many unacceptable printed matters are produced at the beginning of printing operation.
  • EPA-0 326 715 describes a process of preparing a lithographic plate which comprises the steps of in order imagewise exposing to light a presensitized plate comprising an aluminium support having a lithographically suitable light sensitive layer, developing the plates with a developer/finisher solution to remove areas of the light-sensitive layer thereby obtaining a lithographic plate having an image area and a non-image area.
  • the developer/finisher contains: a) a mono-, di- or tri-sodium, potassium or lithium phosphate; and b) benzyl alcohol, phenoxyethanol and phenoxypropanol; and c) polyvinyl pyrrolidone, dextrin, poly (methyl vinyl ether/maleic acid) and gum arabic; and d) citric acid and benzoic acid; and e) sodium or potassium octyl sulfate; and f) sodium, potassium and lithium benzoate; and g) sodium, potassium and ammonium citrate; and h) sodium, potassium and ammonium sorbate; and i) water to give 100.0% by weight.
  • An object of the present invention is to provide a lithographic plate finisher (hereunder referred to as "plate finisher") having good ability of desensitizing non-image areas but not reducing ink receptivity of image areas.
  • Another object of the present invention is to provide a plate finisher which is stable against phase separation even when the amount of gum arabic used is small.
  • a further object of the present invention is to provide a plate finisher which can easily be prepared with an inexpensive machine.
  • a process of preparing a lithographic plate which comprises the steps of, in order, image wise exposing to light a presensitized plate comprising an aluminum support having a lithographically suitable light-sensitive layer, developing the plate with an aqueous alkaline solution to remove either light-exposed or light-unexposed area of the light-sensitive layer thereby obtaining a lithographic plate consisting of an oleophilic image area and a hydrophilic non-image area and applying to the plate a lithographic plate finisher comprising, in uniform solution, at least one water soluble resin, an organic solvent whose solubility in water at 20 ° C is not more than 5% by weight, and water.
  • the plate finisher used in the process of the present invention comprises a solvent whose solubility in water at 20 ° C is not more than 5% by weight.
  • the addition of such solvent improves ink receptivity of image areas.
  • solvent examples include benzyl alcohol, ethylene glycol dibutyl ether, ethylene glycol benzyl ether, ethylene glycol monophenyl ether, hexyl glycol, hexyl diglycol, propyl propylene diglycol, methyl phenyl carbitol, diethylene glycol dibutyl ether, n-amyl alcohol, metyl amyl alcohol, isophorone, methyl cyclohexanone and acetophenone.
  • benzyl alcohol is most preferred because it is highly stable and inexpensive but does not give out strong odor.
  • the solvent may be used alone or in combination.
  • the amount of the solvent used is preferably 0.1 to 10 % and more preferably 0.5 to 5 % by weight based on the total weight of the plate finisher. If it is less than 0.1 % by weight, ink receptivity of image areas is reduced. On the other hand, if it exceeds 10 % by weight, the plate surface becomes sticky and the drying property is deteriorated. Solvents whose solubility in water is more than 5 % by weight have no or insufficient effect on the prevention of lowering of ink receptivity of image areas.
  • the plate finisher may contain a variety of water-soluble resins.
  • Such resins include natural high molecular compounds such as starches derived from sweet potato, potato, tapioca, wheat, corn and waxy corn; those derived from sea weeds such as carrageenan, laminaran, sea weed mannan, funori (a glue plant), Irish moss, agar and sodium alginate; mucilage derived from plants such as tororo-aoi mucin, mannan, quince seed mucin, pectin, tragacanth gum, karaya gum, xanthine gum, guar bean gum, locust bean gum, gum arabic, carob gum and benzoiun gum; mucilage derived from microorganisms such as homopolysaccharides (e.g., dextran, glucan and levan) and heteropolysaccharides (e.g., succinoglucan and xanthane gum); proteins such as glue, gelatin, casein and collagen; semisynthetic sompounds
  • water-soluble resins may be used in the plate finisher alone or in combination in an amount of, preferably, 5 to 40 %, more preferably 10 to 30 % by weight based on the total weight of the plate finisher.
  • gum arabic it is possible to significantly lower the amount of gum arabic to be used in the plate finisher.
  • gum arabic may not be used at all in the finisher, it is preferable to use gum arabic in an amount of 1 to 20 % by weight based on the total weight of the water-soluble resin used in the finisher to give sufficient desensitizing ability to non-image areas.
  • the plate finisher is preferably used in the acid region, i.e., at pH ranging from 2 to 6.
  • the pH value is generally adjusted by adding a mineral acid, an organic acid, an inorganic salt, an alkali agent or the like to the plate finisher.
  • the amount thereof generally ranges from 0.01 to 3 % by weight.
  • mineral acids are nitric acid, sulfuric acid and phosphoric acid and those of the organic acids are citric acid, acetic acid, oxalic acid, malonic acid, p-toluenesulfonic acid, tartaric acid, malic acid, lactic acid, levulinic acid, phytic acid, benzoic acid, butyric acid, maleic acid, picolinic acid and organophosphonic acids .
  • Useful examples of the foregoing inorganic salts are water soluble alkali metal salts and ammonium salts of nitric acid, phosphoric acid, sulfuric acid, molybdenic acid, acetic acid, polyphosphoric acid and boric acid, such as sodium nitrate, potassium nitrate, ammonium nitrate, monosodium phosphate, disodium phosphate, monopotassium phosphate, dipotassium phosphate, monoammonium phosphate, diammonium phosphate, sodium sulfate, potassium sulfate, ammonium sulfate, sodium molybdate, potassium molybdate, ammonium molybdate, sodium acetate, potassium acetate, ammonium acetate, sodium tripolyphosphate, sodium hexametaphosphate, sodium pyrophosphate, soium borate and ammonium borate and those of the foregoing alkali agents are alkali metal hydroxides such as sodium hydroxide
  • the foregoing mineral acids, organic acids, inorganic salts or alkali agents may be used alone or in combination.
  • a surfactant can be added to the plate finisher to improve the surface conditions or the like of the resulting coated film and to stably solubilize the solvent whose solubility in water at 20 ° C is not more than 5 % by weight.
  • the surfactants usable herein include anionic, nonionic, amphoteric and cationic surfactants.
  • anionic surfactants include fatty acid salts, alkylbenzene sulfonic acid salts, straight chain alkylbenzene sulfonic acid salts, alkyl sulfonic acid salts, a -olefin sulfonic acid salts, alkyl phosphoric acid ester salts, dialkyl sulfo succinic acid ester salts, polyoxyethylene alkyl ether sulfonic acid salts, polyoxyethylene alkyl ether phophoric acid salts, alkyl naphthalene sulfonic acid salts, N-lauroyl sarcosine salts, sulfonic acid salts of condensates of naphthalene and formaldehyde, and diphenylether disulfonic acid salts.
  • nonionic surfactants are polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenol ethers, polyoxyethylene-polyoxypropylene brock copolymers, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene fatty acid amines, fatty acid monoglycerides, sorbitan fatty acid esters, pentaerythritol fatty acid esters, sucrose fatty acid esters and amine oxides.
  • amphoteric surfactants examples include alkylcarboxy betaines, alkylamino carboxylic acids and alkylimidazolines.
  • cationic surfactants examples include tetraalkyl ammonium salts, trialkyl benzyl ammonium salts and alkyl imidazolinium salts.
  • fluorine atom containing surfactants and silicon atom containing surfactants examples include fluorine atom containing surfactants and silicon atom containing surfactants.
  • anionic and/or nonionic surfactants are more effective.
  • the surfactants may be used alone or in combination.
  • the amount thereof used is not limited to a specific range, but preferably it ranges from 0.01 to 10% by weight on the basis of the total weight of the plate finisher.
  • the plate finisher may further comprise a lower alcohol such as glycerin, ethylene glycol and triethylene glycol as a wetting agent.
  • the amount of the wetting agent preferably ranges from 0.1 to 5.0 % by weight, more preferably 0.5 to 3.0 % by weight based on the total weight of the plate finisher.
  • the plate finisher may comprise other additives such as preservatives. Examples thereof are benzoic acid and derivatives thereof, phenol, formalin, sodium dehydroacetate and 3-isothiazolones. These compounds may be used in an amount ranging from 0.005 to 2.0 % by weight of the plate finisher.
  • the plate finisher may contain other additives which are used in conventional plate finishers, for example, anti-foaming agents, chelating agents and coloring agents.
  • the plate finisher can be prepared by dissolving with agitation the solvent, a water soluble resin, a surfactant, a pH adjusting agent, a wetting agent and a preservative in water or if necessary in hot water. Since the plate finisher is a non-emulsion type gum solution, it is unnecessary to prepare a water phase and an oil phase and subsequently to emulsify the mixture with a homogenizer unlike an emulsion type gum solution. Thus, the plate finisher can be prepared easily with an inexpensive equipment.
  • the plate finisher may be applied to various kinds of lithographic printing plates, in particular the plate finisher can suitably be applied to those obtained by imagewise exposing a presensitized plate (called "PS plate") comprising an aluminum substrate provided thereon with a light-sensitive layer and then developing the same.
  • PS plate presensitized plate
  • Examples of preferred such PS plates include those comprising an aluminum substrate provided thereon with a light-sensitive layer composed of a mixture of a diazo resin (a salt of a condensate of p-diazodiphenylamine and paraformaldehyde) and shellac as disclosed in British Patent No.
  • negative working PS plates such as those comprising an aluminum substrate provided thereon with a light-sensitive layer composed of a mixture of a diazo resin and a polymer mainly composed of repeating units derived from hydroxyethyl methyacrylate or hydroxyethyl acrylate as disclosed in British Patent Nos. 1,460,978 and 1,505,739; and positive working PS plates such as those comprising an aluminum substrate provided thereon with a light-sensitive layer composed of a mixture of o-quinonediazide light-sensitive substance and a novolak type phenol resin as disclosed in J.P. KOKAI No. Sho 50-125806.
  • PS plates further include PS plates comprising an aluminum substrate provided thereon with a light-sensitive layer composed of a photocross-linkable photopolymer specifically described in U.S. Patent No. 3,860,426; PS plates comprising an aluminum plate provided thereon with a light-sensitive layer composed of a photopolymerizable photopolymer composition as disclosed in U.S. Patent Nos. 4,072,528 and 4,072,527; and PS plates comprising an aluminum plate provided thereon with a light-sensitive layer composed of a mixture of an azide and a water-soluble polymer as disclosed in British Patent Nos. 1,235,281 and 1,495,861.
  • a PS plate is imagewise exposed to light and then developed to give a lithographic printing plate.
  • a developer usable in the foregoing development is an alkaline solution whose principal solvent is water.
  • the developer optionally comprises additives such as organic solvents, anionic surfactants and inorganic salts in addition to an alkaline agent.
  • alkaline agents include inorganic alkaline agents such as sodium silicate, potassium silicate, potassium hydroxide, sodium hydroxide, lithium hydroxide, sodium tertiary phosphate, sodium bicarbonate, sodium carbonate, potassium carbonate and ammonium carbonate; and organic alkaline agents such as mono-, di- or tri-ethanolamine and propanolamine.
  • the amount thereof used in the developer preferably ranges from 0.05 to 4 % by weight and more preferably 0.1 to 2 % by weight.
  • organic solvents examples include alcohols such as n-propyl alcohol and benzyl alcohol; and glycol ethers such as phenyl cellosolve.
  • the organic solvents are added to the developer preferably in an amount ranging from 0.5 to 15 % by weight and more preferably 1 to 5 % by weight.
  • anionic surfactants include alkylsulfuric acid ester salts such as sodium laurylsulfate; alkylarylsulfonic acid salts such as sodium dodecylbenzenesulfonate; sulfonic acid salts of dibasic fatty acid esters such as sodium di-(2-ethylhexyl)sulfosuccinate; alkylnaphthalenesulfonic acid salts such as sodium n-butylnaphthalene-sulfonate; and polyoxyethylene alkyl(phenol) ether sulfates and in particular alkylnaphthalenesulfonic acid salts such as n-butylnaphthalenesulfonic acid salt are suitably used.
  • the amount of the anionic surfactants in the developer preferably ranges from 0.1 to 5 % by weight and more preferably 0.5 to 1.5 % by weight.
  • inorganic salts are water-soluble alkali metal or alkaline earth metal salts of inorganic acids such as phosphoric acid, silicic acid, carbonic acid and sulfurous acid and, particularly preferred are alkali and alkaline earth metal salts of sulfurous acid.
  • the amount of these inorganic salts in the developer in general ranges from 0.05 to 5 % by weight and preferably 0.1 to 1 % by weight.
  • the developer further comprises other additives such as antifoaming agents and wetting agents, if necessary.
  • the imagewise exposed PS plate can be developed with the foregoing developer in various known manners.
  • Specific examples of methods for developing the imagewise exposed PS plate include a method comprising dipping the PS plate in a developer; a method comprising spraying a developer on the light-sensitive layer of the PS plate through a plurality of nozzles; a method comprising rubbing the light-sensitive layer of the PS plate with a sponge containing a developer; and a method comprising applying a developer to the surface of the light-sensitive layer of the PS plate with a roller.
  • the resulting lithographic printing plate thus developed is washed with water, the water is squeezed from the surface of the PS plate, then a proper amount of the plate finisher of the present invention is poured onto the plate surface. Then, the plate surface is rubbed with a sponge so that the plate finisher is uniformly distributed throughout the plate surface. As a result, non-image areas of the plate surface can be protected and hence the lithographic printing plate can stably stored.
  • the plate finisher can be applied to the plate surface in various manner, for example, by applying the plate finisher to the resulting lithographic printing plate after the development and water washing by use of an automatic gumming-up machine; supplying it to the printing plate immediately after the development without water washing; or applying it to the printing plate after water washing with a small amount of water or after rinsing with a rinse solution containing a surfactant by use of an automatic gumming-up machine.
  • the lithographic printing plate is in general washed with water, prior to the printing operation to remove the gum on the plate surface (so-called degumming step) and then printing is performed in a conventional manner.
  • the plate finisher makes it possible to directly perform the printing operation without carrying out such a degumming step.
  • the process of the present invention provides acceptable clear printed matters immediately after the initiation of the printing operation without providing a great number of unacceptable printed matters as usually observed when conventional gumming solution is used.
  • Non-image areas treated by the plate finisher are kept highly hydrophilic.
  • the plate finisher can provide good printed matters free of background contamination.
  • the aluminum substrate thus treated was coated with a solution of a light-sensitive composition (hereunder referred to as "light-sensitive solution”) comprising 2.0 parts by weight of 2-hydroxyethyl methacrylate copolymer (synthesized according to the method disclosed in Example 1 of British Patent No.
  • Solution A was prepared.
  • Solution B was gradually added to Solution A with vigorous agitation to obtain an emulsion which was further emulsified with a homogenizer to prepare a plate finisher.
  • the PS plate prepared in step (a) was exposed to light through a negative transparency having halftone dot image.
  • the exposed plate was processed in an automatic processor (Model 600 EII manufactured by FUJI PHOTO FILM CO., LTD.) having a developing zone provided with an aqueous developer comprising 3.0 parts by weight of sodium sulfite, 30.0 parts by weight of benzyl alcohol, 20.0 parts by weight of triethanolamine, 5.0 parts by weight of monoethanolamine, 10.0 parts by weight of sodium t-butylnaph- thalenesulfonate and 1000 parts by weight of pure water, to develop the exposed plates, and a finishing zone provided with one part by volume of Gum solution I, II, III or IV prepared in step (b) and one part by volume of tap water, to apply each of the plate finishers to the developed plates immediately after the development without washing with water. Lithographic printing plates were thus prepared.
  • Comparative Example b used a conventional emulsion type gum solution III wherein a large amount of gum arabic was used.
  • Comparative Example c used Gum solution IV wherein the amount of gum arabic was reduced and a large amount of a conventional water-soluble resin was used. Comparing with Comparative Example b, Comparative Example c was small in the number of spoiled printed matters but produced contamination in non-image areas during printing and was so unstable that the solution was separated into a water phase and an oil phase in a few days. Comparative Example a wherein the oil phase was removed was low in background contamination during printing and high in solution stability but produced many spoiled printed matters.
  • Example 1 of the present invention wherein benzyl alcohol was added was smaller in the number of spoiled printed matters than the conventional emulsion type gum solution (Comparative Example b) and was low in background contamination during printing and high in solution stability. Further, the gum solution of Example 1 was prepared more easily using more inexpensive equipment than the emulsion type gum solutions of Comparative Examples b and c.
  • a light-sensitive solution was prepared by dissolving, in 40 parts by weight of methyl cellosolve, 1 part by weight of naphthoquinone-1,2-diazide-5-sulfonic acid ester of polyhydroxyphenyl obtained by polycondensing acetone and pyrogallol as disclosed in J.P. KOKOKU No. Sho 43-28403 and 2 parts by weight of novolak type cresol-formaldehyde resin.
  • a grained aluminum plate having a thickness of 0.2 mm was sufficiently washed and then dried.
  • the foregoing light-sensitive solution was applied to the surface of the aluminum plate with a whirler and then dried to thus obtain a positive working PS plate having a light-sensitive layer in an amount of about 0.2 g /m 2.
  • the PS plate prepared in step (d) was exposed to light through a positive transparency having halftone dot iamage, developed with 3% aqueous solution of sodium silicate, washed with water and dried.
  • the exposed plate was processed in an automatic processor (Model 800 EB manufactured by FUJI PHOTO FILM CO., LTD.) having a developing zone provided with 3 % aqueous sodium silicate solution, to develop the exposed plates, and a finishing zone provided with one part by volume of Gum solution I, II, III or IV prepared in step (b) and one part by volume of tap water, to apply each of the plate finishers to the developed plates immediately after the development without washing with water. Lithographic printing plates were thus prepared.
  • an automatic processor Model 800 EB manufactured by FUJI PHOTO FILM CO., LTD.
  • the plate finisher is excellent in the desensitizing ability and does not deteriorate the ink receptivity of image areas. Therefore, the lithographic printing plate prepared by the process of this invention has good ink receptivity from the beginning of the printing operation. Moreover, the plate finisher is excellent in stability over time and can be prepared easily with an inexpensive equipment.

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Claims (13)

1. Verfahren zur Herstellung einer lithographischen Platte, das in der genannten Reihenfolge die folgenden Stufen umfaßt:
bildmäßiges Belichten einer vorsensibilisierten Platte mit einem Aluminium-Träger und einer darauf aufgebrachten lithographisch geeigneten lichtempfindlichen Schicht mit Licht,
Entwickeln der Platte mit einer wäßrigen alkalischen Lösung zur Entfernung entweder des belichteten Bereichs oder des nicht-belichteten Bereichs der lichtempfindlichen Schicht unter Bildung einer lithographische Platte, die besteht aus einem oleophilen Bildbereich und einem hydrophilen Nicht-Bildbereich, und
Aufbringen eines lithographischen platten-Finishers auf die Platte, der in Form einer einheitlichen Lösung enthält mindestens ein wasserlösliches Harz, ein organisches Lösungsmittel, dessen Löslichkeit in Wasser bei 20 ° C nicht mehr als 5 Gew.-% beträgt, und Wasser.
2. Verfahren nach Anspruch 1, worin das Lösungsmittel, dessen Löslichkeit in Wasser bei 20 ° C nicht mehr als 5 Gew.-% beträgt, ausgewählt wird aus der Gruppe, die besteht aus Benzylalkohol, Ethylenglycoldibutyläther, Ethylenglycolbenzyläther, Ethylenglycolmonophenyläther, Hexylglycol, Hexyldiglycol, Propylpropylendiglycol, Methylphenylcarbitol, Diethylenglycoldibutyläther, n-Amylalkohol, Methylamylalkohol, Isophoron, Methylcyclohexanon und Acetophenon.
3. Verfahren nach Anspruch 1, worin das Lösungsmittel Benzylalkohol ist.
4. Verfahren nach Anspruch 1, worin die verwendete Menge des Lösungsmittels 0,1 bis 10 Gew.-%, bezogen auf das Gesamtgewicht des Platten-Finisher, beträgt.
5. Verfahren nach Anspruch 1, worin die verwendete Menge des Lösungsmittels 0,5 bis 5 Gew.-%, bezogen auf das Gesamtgewicht des Platten-Finishers, beträgt.
6. Verfahren nach Anspruch 1, worin das wasserlösliche Harz ausgewählt wird aus der Gruppe, die besteht aus Stärken, die stammen aus süßer Kartoffel, Tapioka, Weizen, Mais und wachsartiger Stärke; solchen, die stammen aus Carrageenan, Laminaran, Seegrasmannan, Funori (einer Leim-Pflanze), Irisch Moos, Agar und Natriumalginat; Muzilago, das stammt aus Tororo-aoi-Mucin, Mannan, Quittensamen-Mucin, Pectin, Traganthgummi, Karaya-Gummi, Xanthingummi, Guarbohnengummi, Johannisbrotgummi, Gummiarabicum, Carobagummi und Benzoiungummi; Dextran, Glucan, Levan, Succinoglucan und Xanthangummi); Leim, Gelatine, Casein und Collagen; Propylenglycolalginat, Viscose, Methylcellulose, Ethylcellulose, Methylethylcellulose, Hydroxyethylcellulose, Carboxymethylcellulose, Hydroxypropylcellulose, Hydroxypropylmethylcellulose und Hydroxypropylmethylcellulosephthalat; behandelten Stärken, Enzym-modifiziertem Dextrin, säurebehandelter Stärke, oxidierte, gelatinierte Stärke, veresterte Fettsäure-Stärke, Schwefelsäure-Stärke, Salpetersäure-Stärke, Xanthogensäure-Stärke, Carbamidsäure-Stärke und Bernsteinsäure-Stärke, verätherte Stärke, vernetzte Stärke und Stärke-Pfropf-Copolymere; Polyvinylalkohol, modifizierter Polyvinylalkohol, Poly(meth)acrylsäurederivate; Polyethylenglycol, Polyethylenoxid, Polyvinylpyrrolidon, Polyvinylpyrrolidon-Vinylacetat-Copolymer, Carboxyvinylpolymer, Styrol-Maleinsäure-Copolymer und Styrol-Crotonsäure-Copolymer, und in einer Menge von 5 bis 40 Gew.- %, bezogen auf das Gesamtgewicht des Platten-Finishers, darin enthalten ist.
7. Verfahren nach Anspruch 1, worin das wasserlösliche Harz Gummiarabicum in einer Menge von 1 bis 20 Gew.-%, bezogen auf das Gesamtgewicht des wasserlöslichen Harzes, enthält.
8. Verfahren nach Anspruch 1, worin der Platten-Finisher außerdem mindestens ein Netzmittel, ausgewählt aus der Gruppe, die besteht aus Glycerin, Ethylenglycol und Triethylenglycol, in einer Menge in dem Bereich von 0,1 bis 5,0 Gew.-%, bezogen auf das Gesamtgewicht des Platten-Finishers, enthält.
9. Verfahren nach Anspruch 1, worin der Platten-Finisher außerdem mindestens ein oberflächenaktives Agens, ausgewählt aus der Gruppe, die besteht aus Fettsäuresalzen, Alkylbenzolsulfonsäuresalzen, geradkettigen Alkylbenzolsulfonsäuresalzen, Alkylsulfonsäuresalzen, a-Olefinsulfonsäuresalzen, Alkylphosphorsäureestersalzen, Dialkylsulfobernsteinsäureestersalzen, Polyoxyethylenalkyläthersulfonsäuresalzen, Polyoxyethylenalkylätherphosphorsäuresalzen, Alkylnaphthalinsulfonsäuresalzen, N-Lauroylsarcosinsalzen, Sulfonsäuresalzen von Kondensaten von Naphthalin und Formaldehyd, Diphenylätherdisulfonsäuresalzen; Polyoxyethylenalkyläthern, Polyoxyethylenalkylphenoläthern, Polyoxyethylen-Polyoxypropylen-Block-Copolymeren, Polyoxyethylensorbitanfettsäureestern, Polyoxyethylenglycerinfettsäureestern, Polyethylenglycolfettsäureestern, Polyoxyethylenfettsäureaminen, Fettsäuremonoglyceriden, Sorbitanfettsäureestern, Pentaerythritfettsäureestern, Saccharosefettsäureester, Aminoxiden; Alkylcarboxylbetainen, Alkylaminocarbonsäuren, Alkylimidazolinen; Tetraalkylammoniumsalzen, Trialkylbenzylammoniumsalzen, Alkylimidazoliniumsalzen; ein Fluoratom enthaltenden oberflächenaktiven Agentien und ein Siliciumatom enthaltenden oberflächenaktiven Agentien, in einer Menge von 0,01 bis 10 Gew.- %, bezogen auf das Gesamtgewicht des Platten-Finisher, enthält.
10. Verfahren nach Anspruch 1, worin der Platten-Finisher außerdem mindestens ein pH-Wert-Einstellungsmittel enthält und einen pH-wert von 2 bis 6 hat.
11. Verfahren nach Anspruch 1, worin der Platten-Finisher außerdem mindestens ein Konservierungsmittel, ausgewählt aus der Gruppe, die besteht aus Benzoesäure, Derivaten davon, Phenol, Formalin, Natriumdehydroacetat und 3-Isothiazolonen, in einer Menge in dem Bereich von 0,005 bis 2,0 Gew.-% des Platten-Finishers, enthält.
12. Verfahren nach Anspruch 1, worin der Platten-Finisher außerdem mindestens einen Vertreter aus der Gruppe der Antischaumbildner, der Chelatbildner und der Färbemittel enthält.
13. Verfahren nach Anspruch 1, worin die lichtempfindliche Schicht ein lichtempfindliches Diazoharz und ein polymeres Bindemittel enthält.
EP19910300533 1990-02-09 1991-01-24 Endbearbeitungslösung für lithographische Platten Expired - Lifetime EP0441502B2 (de)

Applications Claiming Priority (2)

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JP30474/90 1990-02-09
JP3047490A JPH03234595A (ja) 1990-02-09 1990-02-09 平版印刷版用版面保護剤

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EP0441502A2 EP0441502A2 (de) 1991-08-14
EP0441502A3 EP0441502A3 (de) 1991-08-21
EP0441502B1 true EP0441502B1 (de) 1994-12-28
EP0441502B2 EP0441502B2 (de) 1998-08-26

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Publication number Priority date Publication date Assignee Title
DE19719936A1 (de) * 1997-05-13 1998-11-19 Fogra Forschungsgesellschaft D Feuchtmittel für den Offsetdruck
JP2001138656A (ja) * 1999-11-10 2001-05-22 Fuji Photo Film Co Ltd 平版印刷用濃縮湿し水組成物
US20020187427A1 (en) 2001-05-18 2002-12-12 Ulrich Fiebag Additive composition for both rinse water recycling in water recycling systems and simultaneous surface treatment of lithographic printing plates
DE102008025344A1 (de) 2007-10-01 2009-04-02 Heidelberger Druckmaschinen Ag Verfahren zum Behandeln einer wiederbebilderbaren Druckform

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5266002A (en) * 1975-11-26 1977-06-01 Fuji Photo Film Co Ltd Desensitizer for lithographic press plate
DE3006964A1 (de) * 1980-02-25 1981-09-10 Hoechst Ag, 6000 Frankfurt Lackemulsion und verfahren zum herstellen von flachdruckformen
JPS5957793A (ja) * 1982-09-02 1984-04-03 Konishiroku Photo Ind Co Ltd 平版印刷版用版面保護剤
JPS5957242A (ja) * 1982-09-20 1984-04-02 Konishiroku Photo Ind Co Ltd 平版印刷版の製版方法
JPS6273269A (ja) * 1985-09-26 1987-04-03 Konishiroku Photo Ind Co Ltd 感光性平版印刷版の処理方法
US4873174A (en) * 1988-02-03 1989-10-10 Hoechst Celanese Corporation Method of using developer-finisher compositions for lithographic plates

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EP0441502A3 (de) 1991-08-21
JPH03234595A (ja) 1991-10-18
DE69106158D1 (de) 1995-02-09
EP0441502B2 (de) 1998-08-26
DE69106158T3 (de) 1999-02-25
DE69106158T2 (de) 1995-05-04
CA2034965A1 (en) 1991-08-10
EP0441502A2 (de) 1991-08-14

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