[go: up one dir, main page]

EP0638436A1 - Agent protecteur de surface et agent de nettoyage pour plaques lithographiques - Google Patents

Agent protecteur de surface et agent de nettoyage pour plaques lithographiques Download PDF

Info

Publication number
EP0638436A1
EP0638436A1 EP94112430A EP94112430A EP0638436A1 EP 0638436 A1 EP0638436 A1 EP 0638436A1 EP 94112430 A EP94112430 A EP 94112430A EP 94112430 A EP94112430 A EP 94112430A EP 0638436 A1 EP0638436 A1 EP 0638436A1
Authority
EP
European Patent Office
Prior art keywords
acid
surface protective
agent
weight
protective agent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94112430A
Other languages
German (de)
English (en)
Inventor
Hiroshi C/O Fuji Photo Film Co. Ltd. Matsumoto
Kenji C/O Fuji Photo Film Co. Ltd. Kunichika
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Publication of EP0638436A1 publication Critical patent/EP0638436A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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 surface protective agent for a lithographic printing plate and to a cleaning agent for a lithographic printing plate.
  • the material is coated with a so-called gum solution at the final stage thereof.
  • the object of coating with a gum solution is to protect the water wettability of the non-image area as well as to inhibit the contamination of the printing plate due to the attachment of scumming such as fingerprints, fats and oils and dust, and protect the printing plate against the occurrence of scratches during image correction such as addition and deletion on the image area, storage between plate making and printing or reuse, mounting on a printing machine, or in handling. Further, the object of coating with a gum solution is to inhibit the occurrence of oxidative contamination.
  • an aqueous solution of gum arabic, cellulose gum or water-soluble high molecular substance having carboxyl groups in its molecule has heretofore been normally used. However, such a gum solution has some disadvantages.
  • the final finishing process in the preparation of a printing plate is normally carried out by pouring a gum solution onto the printing plate, spreading the gum solution over the entire surface of the printing plate with a sponge, cotton tampon or the like, and then rubbing the surface of the printing plate with the sponge, cotton tampon or the like until it is dried.
  • the image area (ink- receptive area) is partly coated thickly with a water-soluble high molecular substance.
  • the thickly coated image area exhibits a reduced ink-receptivity during printing.
  • this phenomenon is called printing fault (so-called poor ink-receptivity).
  • JP-B As used herein means an "examined Japanese patent publication”
  • JP-A-52-56603 (the term "JP-A” as used herein means an "unexamined published Japanese patent application")
  • JP-A-54-97102 West German Patent 2,504,594
  • Soviet Patent 623,755 propose dextrin, pullulan, pullulan derivatives, carboxyl-containing polyacrylamide derivatives, and methyl (meth)-acrylate graft polyacrylamide copolymer.
  • modified starch compounds such as carboxymethylated modified starch and cyclodextrin are disclosed. Since these compounds have an insufficient effect of desensitizing the non-image area, they are used in admixture with gum arabic. Further, since these compounds have an unstable adaptability to protective colloid of emulsion as compared with gum arabic, the use thereof is limited.
  • a lithographic printing plate which has suffered from scumming is treated with a so-called plate cleaning agent (also referred to as "plate cleaner") for removing ink from the plate as well as recovering the hydrophilicity of the non-image area.
  • plate cleaning agent also referred to as "plate cleaner”
  • plate cleaning agent there has heretofore been known one comprising an aqueous solution of sodium silicate.
  • this plate cleaning agent is disadvantageous in that it is alkaline and thus can attack part of the image area or deteriorate the ink affinity of the image area when used to treat a photosensitive lithographic printing plate adapted to be developed with an aqueous alkaline developer.
  • the printing plate is treated with a cleaning agent (kerosine or hydrocarbon solvent) to remove an ink therefrom, and then treated with a desensitizing agent.
  • a cleaning agent kerosine or hydrocarbon solvent
  • the treatment with the conventional plate cleaning agents as mentioned above must be conducted after the cleaning of the plate with an ink remover.
  • the treatment with these plate cleaning agents requires two steps and thus is complicated.
  • an emulsion type plate cleaning agent i.e., plate cleaning agent which can exert an ink removing effect as well as desensitizing effect has been recently developed.
  • JP-A-52-15702 discloses an alkaline emulsion type plate cleaning agent
  • JP-A-53-2102 discloses an acidic emulsion type plate cleaning agent.
  • these emulsion type plate cleaning agents are disadvantageous in that they have a poor capacity of removing scumming caused by scratching from a lithographic printing plate which has been subjected to a burning-in treatment or cannot exert an effect of desensitizing the scratched area for a sufficient period of time, causing occasional recurrence of scumming during printing.
  • the foregoing acidic emulsion type plate cleaning agent normally comprises much gum arabic as a protective colloid component for stabilizing emulsion to utilize its inherent effect of inhibiting scumming on the non-image area.
  • the foregoing alkaline emulsion type plate cleaning agent normally comprises a cellulose high molecular compound instead of gum arabic because gum arabic undergoes gelation in the alkaline emulsion type plate cleaning agent. Accordingly, the alkaline emulsion type plate cleaning agent is disadvantageous in that it suffers from unstable emulsification that leads to separation of liquid and thus can cause uneven treatment unless it is thoroughly stirred and homogenized before use after prolonged storage.
  • gum arabic is mainly produced in the Sudan, which is called a gum arabic belt in the African Continent.
  • a drought due to climatic change and a political instability have caused a marked market change that makes the product hardly available.
  • the development of alternate high molecular compounds has been desired.
  • An object of the present invention is to provide a surface protective agent which desensitizes the non-image area on a lithographic printing plate as well as causes no printing faults even after a prolonged storage.
  • Another object of the present invention is to provide a surface protective agent which can be easily applied onto the surface of a lithographic printing plate with a sponge, cotton tampon, automatic gum coater or the like, can be easily removed water wettability of the non-image area and can be used without gum arabic.
  • Still another object of the present invention is to provide a plate cleaning agent for a lithographic printing plate having an excellent capacity of removing scumming as well as a high aging stability.
  • a surface protective agent for a lithographic printing plate comprising an aqueous solution containing a film-forming water-soluble soybean polysaccharide.
  • an emulsion type plate cleaning agent comprising a film-forming polysaccharide extracted from soybean.
  • a water-soluble soybean polysaccharide is extracted from soybean with water, and mainly comprises galactose, arabinose and galacturonic acid. It is commercially available as Soyafive-S-LN from FUJI OIL COMPANY, LIMITED.
  • the soybean polysaccharide used in the present invention has preferably an average molecular weight of from 50,000 to 1,000,000 and a viscosity of from 5 to 100 cp (centipoises) in a 10% by weight aqueous solution at a temperature of 25 ° C.
  • the content of such a soybean polysaccharide in the surface protective agent according to the present invention is preferably from 0.3 to 50% by weight, more preferably from 0.5 to 40% by weight.
  • a soybean polysaccharide is used in the form of homogeneous solution in water or hot water.
  • such a soybean polysaccharide is used in combination with one or more starches or modified starches such as dextrin.
  • Such a soybean polysaccharide may be used in combination with one or more water-soluble high molecular compounds.
  • these water-soluble high molecular compounds include gum arabic, cellulose derivatives (e.g., carboxymethyl cellulose, carboxyethyl cellulose, methyl cellulose) and modified compounds thereof, polyvinyl alcohol and derivatives thereof, polyvinyl pyrrolidone, polyacrylamide and copolymers thereof, vinyl methyl ether-maleic anhydride copolymer, vinyl acetate- maleic anhydride copolymer and styrene-maleic anhydride copolymer.
  • gum arabic cellulose derivatives (e.g., carboxymethyl cellulose, carboxyethyl cellulose, methyl cellulose) and modified compounds thereof, polyvinyl alcohol and derivatives thereof, polyvinyl pyrrolidone, polyacrylamide and copolymers thereof, vinyl methyl ether-maleic anhydride copolymer, vinyl acetate- maleic anhydride
  • the surface protective agent according to the present invention is usually used to advantage in an acidic range of pH 3 to 6.
  • the surface protective agent is usually adjusted with a mineral acid, an organic acid or an inorganic salt in an amount of from 0.01 to 2% by weight.
  • the mineral acid include nitric acid, sulfuric acid, phosphoric acid and metaphosphoric acid.
  • the organic acid include citric acid, acetic acid, oxalic acid, malonic acid, p-toluenesulfonic acid, tartaric acid, malic acid, lactic acid, levulinic acid, phytic acid and organic phosphonic acid.
  • the inorganic salt examples include magnesium nitrate, monobasic sodium phosphate, dibasic sodium phosphate, nickel sulfate, sodium hexametaphosphate and sodium tripolyphosphate.
  • the mineral acid, organic acid or inorganic salt may be used singly or in combination with one or more thereof.
  • the surface protective agent according to the present invention may comprise a surface active agent incorporated therein to improve the surface properties of the coated layer.
  • examples of the surface active agent used in the present invention include an anionic surface active agent and/or nonionic surface active agent.
  • anionic surface active agent examples include aliphates, abietates, hydroxyalkanesulfonates, alkanesulfonates, dialkylsulfosuccinates, straight-chain alkylbenzenesulfonates, branched alkylbenzenesulfonates, alkylnaphthalenesulfonates, alkylphenoxypolyoxyethylenepropylsulfonates, salts of polyoxyethylene alkylsulfophenyl ethers, sodium N-methyl-N-oleyltaurates, monoamide disodium N-alkylsulfosuccinates, petroleum sulfonates, sulfated castor oil, sulfated tallow oil, salts of sulfuric esters of aliphatic alkylesters, salts of alkylsulfuric esters, sulfuric esters of polyoxyethylenealkylethers, salts of sulfuric esters of aliphatic monoglycer
  • nonionic surface active agent examples include polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, polyoxyethylene polystyryl phenyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene polyoxypropylene block polymers, partial esters of glycerinaliphatic acids, partial esters of sorbitanaliphatic acid, partial esters of pentaerythritolaliphatic acid, propyleneglycolmonoaliphatic esters, partial esters of sucrosealiphatic acids, partial esters of polyoxyethylenesorbitanaliphatic acid, partial esters of polyoxyethylenesorbitolaliphatic acids, polyethyleneglycolaliphatic esters, partial esters of poly- glycerinaliphatic acids, polyoxyethylenated castor oils, partial esters of polyoxyethyleneglycerinaliphatic acids, aliphatic diethanolamides, N,N-bis-2-hydroxyalkylamines,
  • fluorinic and siliconic anionic and nonionic surface active agents may be similarly used.
  • Two or more of these surface active agents may be used in combination.
  • a combination of two or more different anionic surface active agents or a combination of an anionic surface active agent and a nonionic surface active agent is preferred.
  • the amount of such a surface active agent to be used is not specifically limited but is preferably from 0.01 to 20% by weight based on the weight of the surface protective agent.
  • a wetting agent such as ethylene glycol, propylene glycol, triethylene glycol, butylene glycol, hexylene glycol, diethylene glycol, dipropylene glycol, glycerin, trimethylol propane and diglycerin may be used if desired.
  • the wetting agent may be used singly or in combination with one or more thereof.
  • the foregoing wetting agent is preferably used in an amount of from 1 to 25% by weight based on the weight of the surface protective agent.
  • a chelate compound may be added to the surface protective agent according to the present invention.
  • a surface protective agent is normally available in the form of concentrated solution.
  • the surface protective agent is diluted with tap water, well water or the like before use. Calcium ion and other impurities contained in the diluting tap water or well water can have adverse effects on printing and thus cause the contamination of printed matter. Such a difficulty can be eliminated by adding a chelate compound to the diluting water.
  • Preferred examples of such a chelate compound include organic phosphonic acids or phosphonoalkanetricarboxylic acids such as ethylenediaminetetraacetic acid, potassium or sodium salt thereof; diethylenetriaminepentaacetic acid, potassium or sodium salt thereof; triethylenetetraminehexaacetic acid, potassium or sodium salts thereof; hydroxyethylethylenediaminetriacetic acid, potassium or sodium salts thereof; nitrilotriacetic acid, sodium salts thereof; 1-hydroxyethane-1,1-diphosphonic acid, potassium or sodium salts thereof; and aminotri(methylenephosphonic acid), potassium or sodium salts thereof.
  • organic amine salts are useful.
  • chelating agents are selected from the compounds which can occur stably in the surface protective agent composition and do not impair the printing properties of the printing plate.
  • the proper amount of such a chelating agent to be added is from 0.001 to 1.0% by weight based on the weight of the surface protective agent in diluted form.
  • an antiseptic and an anti-foaming agent may be added to the surface protective agent according to the present invention.
  • an antiseptic include phenol, derivatives thereof, formalin, imidazole derivatives, sodium dehydroacetate, 4-isothiazoline-3-one derivatives, ben- zoisothiazoline-3-one, benztriazole derivatives, amidineguanidine derivatives, quaternary ammonium salts, pyridine derivatives, quinoline derivatives, guanidine derivatives, diazine, triazole derivatives, oxazole and oxazine derivatives.
  • the proper amount of such an antiseptic to be added is such that it can exert a stable effect on bacteria, fungi, yeast or the like. Though depending on the kind of bacteria, fungi and yeast, it is preferably from 0.01 to 4% by weight based on the weight of the surface protective agent in diluted form. Further, preferably, two or more antiseptics may be used in combination to exert an aseptic effect on various fungi and bacteria.
  • the anti-foaming agent is preferably silicone anti-foaming agents. Among these anti-foaming agents, either an emulsion dispersion type or solubilized type anti-foaming agent may be used.
  • the proper amount of such an anti-foaming agent to be added is from 0.001 to 1.0% by weight based on the weight of the surface protective agent in diluted form.
  • an ink receptivity agent may be added to the surface protective agent according to the present invention if desired.
  • examples of such an ink receptivity agent include turpentine oil, xylene, toluene, low heptane, solvent naphtha, kerosine, mineral spirit, hydrocarbons such as petroleum fraction having a boiling point of about 120°C to about 250 ° C, diester phthalates (e.g., dibutyl phthalate, diheptyl phthalate, di-n-octyl phthalate, di(2-ethylhexyl) phthalate, dinonyl phthalate, didecyl phthalate, dilauryl phthalate, butylbenzyl phthalate), aliphatic dibasic esters (e.g., dioctyl adipate, butylglycol adipate, dioctyl azelate, dibutyl sebacate
  • solvents which can be used in combination with these solvents include ketones (e.g., cyclohexanone), halogenated hydrocarbons (e.g., ethylene dichloride), ethylene glycol ethers (e.g., ethylene glycol monomethyl ether, ethylene glycol monophenyl ether, ethylene glycol monobutyl ether), aliphatic acids (e.g., caproic acid, enathic acid, caprylic acid, pelargonic acid, capric acid, undecylic acid, lauric acid, tridecylic acid, myristic acid, pentadecylic acid, palmitic acid, heptadecylic acid, stearic acid, nonadecanic acid, arachic acid, behenic acid, lignoceric acid, cerotic acid, heptacosanoic acid, montanic acid, melissic acid, lacceric acid, isovaleric acid) and unsaturated
  • the ink receptivity agent may be used singly or in combination with one or more thereof.
  • the ink receptivity agent is preferably used in an amount of from 0.01 to 10% by weight, more preferably from 0.05 to 5% by weight, based on the weight of the surface protective agent.
  • the foregoing ink receptivity agent may be contained in the oil phase in an emulsion dispersion type surface protective agent of the present invention or may be solubilized with the aid of a solubilizing agent.
  • the surface protective agent comprising a soybean polysaccharide according to the present invention can be easily designed as solution type, emulsion type or the like depending on the properties of the photosensitive lithographic printing plate to which it is applied.
  • the surface protective agent according to the present invention can exert a great effect of maintaining the ink-receptivity of the image area and the water wettability of the non-image area.
  • the surface protective agent according to the present invention can be applied to both positive and negative lithographic printing plates.
  • An automatic gumming machine may be used to make a uniform coating with the surface protective agent.
  • the processing with the surface protective agent according to the present invention may be conducted immediately without rinsing after development or may be conducted after development (including rinsing, circulating rinsing with running water or wiping rinsing with a small amount of water) or processing with a rinsing solution containing a surface active agent.
  • a satisfactorily sharp printer matter can be obtained even at the beginning of printing job without wasting many sheets of printing paper as in the prior art.
  • the soybean polysaccharide used as a main component of the surface protective agent of the present invention can be used for various processing solutions for a lithographic printing plate other than the surface protective agent, such as a printing surface washing agent, an emulsion type developing ink fountain solution, a rinsing solution and a deletion fluid.
  • the acidic plate cleaning agent preferably has a pH of from 1 to 4 while the alkaline plate cleaning agent preferably has a pH of from 10 to 13.
  • the content of the water-soluble soybean polysaccharide in the plate cleaning agent according to the present invention is preferably from 1 to 30% by weight, more preferably from 5 to 20% by weight.
  • the foregoing soybean polysaccharide may be used in the form of homogeneous aqueous solution in water or hot water of 50 ° C or less.
  • the acidic emulsion type plate cleaning agent comprises an aqueous phase comprising (1) a water-soluble soybean polysaccharide, (2) at least one compound selected from the group consisting of phosphoric acid, polymerized phosphoric acid, alkaline metal salt thereof and organic phosphonic acid, (3) a nitrate, (4) a sulfate or bisulfate, and (5) water, and an oil phase comprising (6) a hydrocarbon solvent.
  • the composition may further comprise (7) a surface active agent, (8) a water-soluble colloidal substance, (9) a wetting agent, (10) a thixotropic agent, and (11) a pH adjustor incorporated therein, if desired.
  • additives such as a preservative, a germicide and a dye may be incorporated in the plate cleaning agent according to the present invention.
  • the hydrocarbon solvent as the component (6) to be incorporated in the plate cleaning agent of the present invention as an oil phase has an effect of dissolving a lithographic printing ink therein.
  • a petroleum fraction having a melting point of from 120 to 320 °C for use in the removal of ordinary printing ink is particularly useful.
  • the amount of the hydrocarbon solvent to be used is preferably from 5 to 60% by weight, more preferably from 10 to 40% by weight, based on the total weight of the composition. Since the component (6) is nonmiscible with water used as the component (5), the plate cleaning agent should be thoroughly stirred and dispersed before use.
  • the surface protective agent thus obtained was then diluted with water in a proportion of 1 : 1 before use.
  • a lithographic printing plate (FPS: an anodized multi-grain type positive presen- sitized printing plate (PS plate) available from Fuji Photo Film Co., Ltd.) was imagewise exposed to light, developed with a positive developer having the following composition in a PS automatic developing machine 900D (available from Fuji Photo Film Co., Ltd.), and then coated with the surface protective agent on the printing surface.
  • PS plate an anodized multi-grain type positive presen- sitized printing plate
  • the lithographic printing plates thus coated with the respective surface protective agent were each cut into halves, and then stored under the conditions set forth in Table 2. These lithographic printing plates were then used for printing with a Heidel SOR printing machine (available from Heidelberger Druckmaschinen Aktiengesellschaft). These lithographic printing plates were then evaluated for their properties in accordance with the evaluation method as set forth in Table 3.
  • Example 1 is excellent in all the characteristics of surface protective agent as compared with Comparative Examples 1 and 2.
  • the present invention provides a surface protective agent having a good emulsion stability which can provide the printing plate with a good ink-receptivity and maintain the water wettability of the non-image area.
  • emulsifying agents 20 parts by weight of Pelex OT-P (sodium dialkylsulfosuccinate available from Kao Corporation) and 10 parts by weight of Emulgen #903 (poly-(oxyethylene) nonylphenyl ether available from Kao Corporation) and 5 parts by weight of Nonion OP-80 (sorbitan monooleate available from NOF Corporation) were dissolved in 150 parts by weight of Solvent-K (hydrocarbon solvent having a melting point of from 151 to 190 ° C available from Nippon Petrochemical Co., Ltd.) to prepare an oil phase.
  • Solvent-K hydrocarbon solvent having a melting point of from 151 to 190 ° C available from Nippon Petrochemical Co., Ltd.
  • the oil phase was gradually added dropwise to the aqueous phase with stirring at a temperature of 35 °C to prepare a dispersion which was then passed through a homogenizer to prepare an opaque emulsion type plate cleaning agent.
  • a lithographic printing plate VPS-II (anodized multi-grain type positive PS plate available from Fuji Photo Film Co., Ltd.) was imagewise exposed to light, developed with a positive developer DP-4 aqueous solution (8-fold diluted with water), rinsed, and then dried in a PS automatic developing machine 800EII (available from Fuji Photo Film, Co., Ltd.).
  • the plates thus prepared were treated with the foregoing plate cleaning agent on a Heidelberg SOR-M type printing machine (available from Heidelberger Druckmaschinen Aktiengesellschaft) for about 30 seconds, wiped with water, and then subjected to printing. After printing began, normal printed matters showing sufficient ink affinity were first produced at the 7th to 10th sheet. No scumming occurred even after 30,000 sheets.
  • the plate cleaning agent according to the present invention is further characterized by an extremely strong effect of inhibiting scumming caused by scratches on the hydrophilic layer on the non-image area of a lithographic printing plate as well as maintaining and enhancing the recovered hydrophilicity.

Landscapes

  • Printing Plates And Materials Therefor (AREA)
EP94112430A 1993-08-12 1994-08-09 Agent protecteur de surface et agent de nettoyage pour plaques lithographiques Withdrawn EP0638436A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP200751/93 1993-08-12
JP05200751A JP3121966B2 (ja) 1993-08-12 1993-08-12 平版印刷版用版面保護剤

Publications (1)

Publication Number Publication Date
EP0638436A1 true EP0638436A1 (fr) 1995-02-15

Family

ID=16429572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94112430A Withdrawn EP0638436A1 (fr) 1993-08-12 1994-08-09 Agent protecteur de surface et agent de nettoyage pour plaques lithographiques

Country Status (2)

Country Link
EP (1) EP0638436A1 (fr)
JP (1) JP3121966B2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1046192A (ja) * 1996-08-07 1998-02-17 Fuji Photo Film Co Ltd 平版印刷機の給水ローラー用洗浄剤
JP2009083106A (ja) 2007-09-27 2009-04-23 Fujifilm Corp 平版印刷版用版面保護剤及び平版印刷版の製版方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4347289A (en) * 1981-08-03 1982-08-31 Merck & Co., Inc. Use of S-119 in lithographic fountain solutions
WO1994009993A1 (fr) * 1992-11-02 1994-05-11 Fuji Oil Co., Ltd. Adjuvant d'impression

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4347289A (en) * 1981-08-03 1982-08-31 Merck & Co., Inc. Use of S-119 in lithographic fountain solutions
WO1994009993A1 (fr) * 1992-11-02 1994-05-11 Fuji Oil Co., Ltd. Adjuvant d'impression

Also Published As

Publication number Publication date
JPH0752577A (ja) 1995-02-28
JP3121966B2 (ja) 2001-01-09

Similar Documents

Publication Publication Date Title
US5165344A (en) Dampening water composition for lithographic printing and method for lithographic printing
EP2755088B1 (fr) Procédé de fabrication d'une plaque d'impression lithographique
US9156529B2 (en) Method of making a lithographic printing plate
US6312873B1 (en) Plate surface protective agent for lithographic printing plate, and fountain solution composition for lithographic printing plate
EP0638436A1 (fr) Agent protecteur de surface et agent de nettoyage pour plaques lithographiques
US5615613A (en) Method of using a hemicellulose printing assistant for lithographic printing plates
EP0943967B1 (fr) Agent de protection pour la surface d'une plaque d'impression lithographique
EP0620125B1 (fr) Procede d' impression lithographique et utilisation de hemicellulose soluble dans l'eau comme adjuvant d'impression pour des plaques d'impression lithographiques
EP0441502B1 (fr) Composition de finissage pour plaque lithographique
JPH0371135A (ja) 感光性平版印刷版の処理方法
US4778616A (en) Scratch corrector for lithographic printing plates
JP2002079777A (ja) 平版印刷版用版面保護剤
JP2001249461A (ja) 平版印刷版用版面保護剤
JP3052663B2 (ja) 印刷用助剤
JP2002082450A (ja) 平版印刷版用版面保護剤
JPH0517873B2 (fr)
JP2002362059A (ja) 平版印刷版用版面保護剤
JP4969217B2 (ja) 平版印刷版用湿し水濃縮組成物
JPH11288104A (ja) 平版印刷版用版面洗浄剤
JPH07125470A (ja) 平版印刷版用版面洗浄剤
JPH0369947A (ja) 感光性平版印刷版の処理方法
JP3318447B2 (ja) 平版印刷用湿し水組成物
JP2000330299A (ja) 平版印刷版用版面保護剤
JPH08240918A (ja) 感光性平版印刷版の製版方法及び処理装置
JP2001092153A (ja) 平版印刷版用乳化型版面保護剤及び平版印刷法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE GB

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19950817