WO1994009993A1 - Adjuvant d'impression - Google Patents

Adjuvant d'impression Download PDF

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Publication number
WO1994009993A1
WO1994009993A1 PCT/JP1993/001535 JP9301535W WO9409993A1 WO 1994009993 A1 WO1994009993 A1 WO 1994009993A1 JP 9301535 W JP9301535 W JP 9301535W WO 9409993 A1 WO9409993 A1 WO 9409993A1
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WO
WIPO (PCT)
Prior art keywords
water
acid
lithographic printing
agent
soluble
Prior art date
Application number
PCT/JP1993/001535
Other languages
English (en)
Japanese (ja)
Inventor
Mitsuo Hattori
Hitoshi Furuta
Taro Takahashi
Hirokazu Maeda
Original Assignee
Fuji Oil 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
Priority claimed from JP05114318A external-priority patent/JP3052663B2/ja
Application filed by Fuji Oil Co., Ltd. filed Critical Fuji Oil Co., Ltd.
Priority to DE69323999T priority Critical patent/DE69323999T2/de
Priority to EP93923053A priority patent/EP0620125B1/fr
Priority to KR1019940702295A priority patent/KR100192147B1/ko
Publication of WO1994009993A1 publication Critical patent/WO1994009993A1/fr
Priority claimed from US08/265,443 external-priority patent/US5468287A/en
Priority to US08/436,590 priority patent/US5615613A/en

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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 printing aid.
  • the present invention particularly relates to a printing aid useful as a plate surface protective agent, a plate surface cleaning agent, an image erasing agent, a sensitizing protective agent, a gum remover, a dampening solution for printing, and the like.
  • a printing aid useful as a plate surface protective agent, a plate surface cleaning agent, an image erasing agent, a sensitizing protective agent, a gum remover, a dampening solution for printing, and the like.
  • Lithographic printing is a printing method that makes effective use of the property that water and oil are essentially not mixed.
  • the printing plate surface receives water and repels oil-based ink.
  • the former forms a non-image portion, and the latter forms an image portion, respectively.
  • lithographic printing plate auxiliaries such as a plate surface protective agent, a plate surface cleaning agent, an image erasing agent, a sensitizing protective agent, and a gum removing agent are used.
  • a plate surface protective agent a plate surface cleaning agent
  • an image erasing agent a sensitizing protective agent
  • a gum removing agent a water-soluble polymer having a film-forming property has been conventionally used as an essential component.
  • a surface protective agent is applied to protect non-image areas (usually called gumming).
  • the plate surface protective agent is used not only to maintain the hydrophilicity of the non-image area by using the film forming property, but also to modify or erase the image area, and to preserve or reuse the period from plate making until printing. Prevents contamination caused by the attachment of fingerprints, oils and fats, dust, etc. during storage and handling during installation on the printing press, protects against damage, etc., and also suppresses the generation of contamination due to oxidation. Used for
  • arabia gum which is a natural vegetable gum
  • the arabia gum exhibits excellent film-forming properties.
  • a method of physically shaving off unnecessary images with a stone stick a method of corroding and removing the image and the support with a strong alkaline solution, or an organic solvent capable of dissolving the image and an acid such as hydrofluoric acid.
  • a method of dissolving unnecessary images with a solution containing a substance and at the same time, corroding the support to make it hydrophilic.
  • These methods are effective, but the former method has drawbacks such as the inability to process a large area and the occurrence of stains during printing, and the latter method impairs the required image in fine parts. It is not always satisfactory because it has several drawbacks, such as high risk to humans and skin, and problems with wastewater treatment.
  • an image erasing agent containing water-soluble polymer, organic solvent, surfactant and mineral acid has been used.
  • the method is exclusively adopted.
  • arabia gum which is a natural plant gum
  • gum arabic exhibits excellent suitability for forming a film.
  • arabia gum when arabia gum is used as a water-soluble polymer used for a plate surface cleaning agent, a sensitizing protective agent or a gum remover for protecting a non-image area, arabia gum is also used. Excellent suitability for film formation.
  • a fountain solution for lithographic printing is used.
  • the fountain solution for lithographic printing wets the non-image area, magnifying the difference in surface chemistry between the image area and the non-image area, and increases the ink repellency of the non-image area and the ink acceptance of the image area. It has a function to increase the performance.
  • a water-soluble polymer having a film-forming ability is used as an essential component.
  • the gum arabic exhibits excellent film forming properties as a fountain solution for lithographic printing.
  • gum arabic which has been conventionally used as a water-soluble polymer in lithographic printing aids, has excellent suitability in any case, but its supply is easily affected by the weather in the country of production. In recent years, natural plant gum that can be supplied stably has been desired.
  • a modified starch such as a modified starch has been developed, but has a drawback that the non-image area has a poor desensitizing power and is not always satisfactory. Disclosure of the invention
  • An object of the present invention is to provide a printing aid which has stable film-forming properties over a long period of time, is inexpensive, and can be stably supplied.
  • the present inventors have conducted intensive studies in view of the above points, and as a result, when water-soluble hemicellulose, particularly water-soluble hemicellulose derived from beans, is used as a water-soluble polymer component used in a lithographic printing aid, It has been found that a lithographic printing aid having a strong film-forming property can be obtained.
  • the present invention has been completed based on such knowledge.
  • the present invention provides a printing aid containing water-soluble hemicellulose as an active ingredient.
  • the water-soluble hemicellulose in the present invention is preferably derived from beans, especially soybean, and especially from cotyledons.
  • the water-soluble hemicellulose can be used at any molecular weight, but preferably has an average molecular weight of tens of thousands to several millions, specifically 50,000 to 100,000. Is preferred.
  • the average molecular weight of the water-soluble hemicellulose is a value determined by an intrinsic viscosity method that measures the viscosity in a 0.1 M NaNo 3 solution using standard pullulan (manufactured by Showa Denko KK) as a standard substance.
  • the measurement of peronic acid was performed by the Blumenkrantz method, and the measurement of neutral sugars was performed by GLC (gas-liquid mouth chromatography) after alditol acetate conversion.
  • Water-soluble hemicellulose can be obtained by extracting with water from a raw material containing hemicellulose, or in some cases, eluting with T under heating under acid or alkaline conditions, or by eluting with an enzyme.
  • An example of a method for producing water-soluble hemicellulose is as follows. Oil seeds, such as soybeans, palms, palms, corns, cottonseed, etc., which are usually free of oils and proteins, or husks such as rice, wheat, etc. It can be. If the raw material is soy, it is a by-product when producing tofu, soy milk, and isolated soy protein Okara can be used.
  • These materials are prepared under acidic or alkaline conditions, preferably at a pH near the isoelectric point of each protein, preferably below 130 ° C and above 80 ° C. More preferably 13 Decompose by heating at 0 ° C or less 100 ° C or more and fractionate the water-soluble fraction, then dry as it is or, for example, by treating with activated carbon, resin adsorption or ethanol precipitation to obtain aqueous substances or low-molecular substances By removing the substance and drying, water-soluble hemicellulose can be obtained.
  • the water-soluble hemicellulose When such a water-soluble hemicellulose is used as a lithographic printing plate aid and a water-soluble polymer that is a raw material of a fountain solution for lithographic printing, the water-soluble hemicellulose is more effective than when arabia gum or modified starch is used. A stable skin formation state is obtained.
  • the lithographic printing plate aid When the lithographic printing plate aid is in an emulsified state, a product having more excellent emulsifiability can be obtained than in the case where arabic gum or modified starch is used.
  • water-soluble hemicellulose can be used alone as a water-soluble polymer, but by using it together with an existing water-soluble polymer, it is possible to capture the disadvantages of the existing water-soluble polymer. Can be.
  • Existing natural product water-soluble polymers include arabic gum, tragacanth gum, carrageenan, xanthan gum, gelatin, caseinnatrium, green gum, tara gum, seaweed, agar, ferceleran, and tamarind seed polysaccharide.
  • algalin such as karaya gum, trolley mallow, pectin, sodium alginate, pullulan, dielan gum, locust bean gum and whey, and various starches.
  • CMC carboxymethyl cellulose
  • MC methylcellulose
  • EC ethylcellulose
  • HEC hydroxyshethylcellulose
  • Modified starch represented by soluble and soluble starch Etc.
  • existing synthetic water-soluble polymers include polyethylene glycol and its copolymer, polyvinyl alcohol and its copolymer, polyvinylpyrrolidone, polyacrylamide and its copolymer, Examples thereof include polyacrylic acid and its copolymer, vinyl methyl ether maleic anhydride copolymer, vinyl acetate-maleic anhydride copolymer, polystyrene sulfonic acid and its copolymer, and the like.
  • the effect of the water-soluble hemicellulose in the present invention may be further improved by using it in combination with one or more of the above-mentioned various water-soluble polymers.
  • the amount of the water-soluble hemicellulose in the present invention is preferably 0.1 to 35% by weight based on the total amount of the plate surface protective agent. It is preferably from 0.3 to 25% by weight.
  • the plate surface protective agent is advantageously used in the acidic region, that is, in the pH range of 3 to 6.
  • the pH value of the plate surface protective agent it is appropriate to use mineral acid, organic acid, inorganic salt, etc. in the protective agent.
  • Preferred mineral acids include sulfuric acid, nitric acid, phosphoric acid, and methacrylic acid
  • organic acids include acetic acid, citric acid, oxalic acid, malonic acid, p-toluenesulfonic acid, tartaric acid, and lingoic acid. Acids, lactic acid, levulinic acid, organic sulfonic acids, ascorbic acid, gluconic acid, hydroxyacetic acid, sulfanilic acid, phytic acid and the like are useful. Further, an alkali metal salt, an alkaline earth metal salt and an ammonium salt of these mineral acids and organic acids are preferably used. At least one kind or two or more kinds of mineral acids, organic acids and salts thereof may be used.
  • the surface condition of the coating film is improved.
  • a surfactant can be added.
  • Surfactants that can be used include anionic surfactants or nonionic surfactants.
  • anionic surfactants include aliphatic alcohol sulfates, aliphatic alcohol ester salts, dibasic fatty acid ester sulfonates, fatty acid amide sulfonates, alkyl aryl sulfonates, Formaldehyde condensed naphthalene sulfonates, etc.
  • Nonionic surfactants include polyethylene glycol alkyl ether and polyethylene glycol
  • Alkyl esters, sorbin alkyl esters, and polyoxypropylene polyoxyethylene ethers are used. Two or more surfactants may be used in combination.
  • the amount used is not particularly limited, but is preferably added in the range of 0.01 to 10% by weight of the plate surface protective agent.
  • wetting agents preservatives, and the like can be added as necessary.
  • the wetting agent lower polyhydric alcohols such as glycerin, ethylene glycol, and triethylene glycol may be used.
  • the use amount of the wetting agent is suitably from 0.1 to 5% by weight of the plate surface protective agent, and more preferably from 0.5 to 3% by weight.
  • benzoic acid and its derivatives, phenol, formalin, and sodium sodium ⁇ -pi-acetate may be added in a range of 0.005 to 2% by weight of the plate surface protective agent. it can.
  • the plate surface protective agent of the present invention can be used for various lithographic printing plates.
  • a photosensitive lithographic printing plate (PS plate) having an aluminum plate as a support and having a photosensitive layer thereon is preferably used. It can be suitably used for a lithographic printing plate obtained by image exposure and development.
  • the content of the water-soluble polymer in the image erasing agent is 0.1 to 0.1. It is suitably 5% by weight, more preferably 0.5-3% by weight (J 'is present.
  • the organic solvent used in the image erasing agent of the present invention dissolves or swells the photosensitive layer to which the erasing agent is applied, and the ketones include acetone, methylethylketone, and methylisoprote. Pyrketone, diisobutylketone, cyclohexanone, etc .; hydrocarbons such as benzene, toluene, xylene, etc .; ethers, such as methyl glycol, ethyl glycol, butyl glycol, etc .; and esters, methylglycol acetate. Examples of aromatic alcohols such as isopropyl alcohol and butyl alcohol.Propyl alcohol and butyl alcohol. Benzyl alcohol, ethylene glycol and the like, or organic solvents such as dimethylformamide and butylolactone can be exemplified. Or a mixture of two or more
  • organic solvents dimethylformamide, cyclohexanone, xylene, ethyl glycol acetate, and the like exhibit suitability.
  • the organic solvent is used in the range of 50 to 90% by weight in the image erasing agent, and is more preferably used in the range of 60 to 80% by weight.
  • the surfactant used in the present invention include known nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants, and among these, dissolved or dissolved in an organic solvent used. You can choose what you want to scatter.
  • nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene alkylaryl ethers, polyoxyethylene alkyl esters, polyoxyethylene sorbitan alkyl esters, and polyoxyethylene polyoxypropylene copolymers. Polymers. At least one surfactant may be used alone, or two or more surfactants may be used in combination.
  • the surfactant content is It is preferably 3 to 20% by weight, preferably 5 to 15% by weight in the image erasing agent.
  • the image erasing agent in the acidic region, that is, in the pH range of 3-6.
  • the pH value of the image erasing agent it is appropriate to use mineral acid, organic acid, inorganic salt, etc. in the erasing agent.
  • the image erasing agent of the present invention can be easily prepared by mixing the above-mentioned components.
  • the purpose of the prepared image erasing agent can be easily achieved by including it in a brush or the like and applying it to the required portion of the image to be erased, followed by washing with water. It also eliminates re-contamination of erased images during printing.
  • the lithographic printing plate that has been treated with the image erasing agent of the present invention can maintain a good storage state thereafter by applying a plate surface protecting agent, that is, by performing a gumming treatment.
  • the image erasing agent of the present invention can be used for both negative-working and positive-working lithographic printing plates, and can be particularly preferably used for positive-working lithographic printing plates.
  • the amount used is 0.001 to 10% by weight based on the total amount of the fountain solution composition. Is suitable, more preferably 0.005 to 1% by weight.
  • a mineral acid, an organic acid or a salt thereof can be used, and these compounds are used to adjust the pH of the fountain solution composition, the pH buffer, and the lithographic printing plate. Moderate edge and corrosion protection of the support Effective for stopping.
  • the addition amount of the pH buffer substance is preferably in the range of 0.001 to 1% by weight, and is preferably used in an acidic region having a pH value of 3 to 7. Substances, alkali metal phosphates, alkali metal carbonates, silicates, etc., and can be used even in the alkaline range with a pH value of 7 to 11.
  • the fountain solution composition of the present invention may contain a solvent, a wetting agent, a preservative, an antifoaming agent, and the like, if necessary.
  • wetting agent examples include polyols, glycol ethers, alcohols, and surfactants.
  • polyol glycol ethers include 2-ethyl_1,3-hexanediol. Hexyl carbitol, ethylene glycol, diethyl glycol, triethylene glycol, propylene glycol.
  • Examples of the alcohol include ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, isobutyl alcohol, n-amyl alcohol, and benzyl alcohol.
  • surfactant examples include an anionic surfactant, a nonionic surfactant, and a cation surfactant.
  • anionic surfactants include fatty acid salts, abietic acid salts, alkane sulfonates, hydroxyalkane sulfonates, dialkyl sulfosuccinates, linear alkylbenzene sulfonates, branched alkyl benzene sulfonates, Alkylnaphthyl lensulfonate, Alkyl phenoxypolyoxyethylene propylsulfonate, Polyoxyethylene alkylsulfophenyl ether salt, N-methyl-N-oleyl ester Linnadium salt, N-Alkylsulfosuccinic acid Monoamidonina sodium salt, petroleum sulfonate, sulfated castor oil.
  • Sulfated tallow oil sulfate of fatty acid alkyl ester, alkyl sulfate, polyoxetylene alkyl ether sulfate ester, fatty acid Monoglyceride sulfate Ter salt, polyoxyethylene alkyl phenyl ether sulfate, polyoxyethylene styrene phenyl ether sulfate, alkyl phosphate ester, polyoxyethylene alkyl ether phosphate, polyoxyethylene Polyoxyethylene alkyl phenyl ether phosphate, partially genated styrene-maleic anhydride copolymer, partially fluorinated mono-maleic anhydride copolymer, naphthalene sulfonate
  • formalin condensate and the like can be mentioned.
  • dialkyl sulfosuccinates, alkyl sulfates and alkyl naphthalene sulfonates dialkyl
  • Non-ionic surfactants include polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene polystyrene phenyl ether, polyoxyethylene polyoxypropylene alkyl ether, glycerin fatty acid partial ester, sorbitan Fatty acid partial ester, Pennyl erythritol fatty acid partial ester, propylene glycol monofatty acid ester, sucrose fatty acid partial ester, polyoxyethylene sorbitan fatty acid partial ester, polyoxyethylene sorbitol fatty acid partial ester, polyethylene glycol fatty acid Esters, polyglycerin fatty acid partial esters, polyoxyethylenated castor oil, polyoxyethylene glycerin fatty acid partial esters, Fatty acid ethanolamide, N, N-bis-12-hydroxyalkylamine, polyoxyethylenealkylamine, 'triethanolamine fatty acid ester, trialkylamine oxide, etc. Can be Among these, polyoxyethylene
  • anionic surfactant examples include an alkylamine salt, a quaternary ammonium salt, a polyoxyethylenealkylamine salt, and a polyethylenepolyamine derivative.
  • wetting agents can be used alone or in combination of two or more, and are preferably 0.03 to 5% by weight relative to the total weight of the fountain solution composition. %, More preferably 0.05 to 3% by weight.
  • preservatives that can be used in the present invention include phenol and its derivatives, imidazole derivatives, formalin, sodium dehydroacetate, 4-isothiazolin-3-one.
  • Derivatives benzotriazole derivatives, amidine guanidine derivatives, quaternary ammonium salts, derivatives such as pyridine, quinoline, guanidine, etc., diazines, triazole derivatives, oxazoles, and oxazine derivatives. I like it.
  • the amount of preservative added is that amount that can exert its effect stably on bacteria, mold, yeast, etc., and differs depending on the type of microorganism such as bacteria, mold, yeast, etc. It is preferably in the range of 0.001 to 1% by weight based on the total weight of the fountain solution composition, and two kinds thereof are provided so as to obtain an effect on various microorganisms such as bacteria, molds and yeasts. It is preferable to use the above preservatives in combination.
  • the defoaming agent that can be used in the present invention is not particularly limited as long as it has a defoaming effect, but a silicon-based compound is preferred. Silicon-based compounds are classified into a milk type and a one-pack type. Since both of them exhibit a small amount of effect, the amount of the defoamer used is preferably in the range of 0.001 to 0.3% by weight based on the total weight of the fountain solution composition at the time of use.
  • a chelating compound may be added to the fountain solution composition of the present invention, if necessary, in addition to the above compounds.
  • the purpose of adding the chelating compound is to eliminate the disadvantage that calcium ions contained in tap water, well water, etc. used for dilution when using the dampening solution composition have an adverse effect on printing. It is here.
  • the chelating compound that can be suitably used is not particularly limited as long as it is stably present in the fountain solution composition and does not hinder printability.
  • Specific examples thereof include ethylenediaminetetraacetic acid and Ethylene diamine tetraacetic acid sodium salt, ethylene diamine tetraacetic acid sodium salt, diethylene salt Ethylene triamine acetic acid, potassium salt of ethylene triamine acetic acid, sodium salt of diethyl teramic acid acetic acid, sodium salt of diethyl ethylene acetic acid, triethylenetetramine hexaacetic acid, Calcium salt of ethylenetetraminehexaacetic acid, sodium salt of triethylenetetraminehexaacetic acid, hydroxyshethylethylenediaminetriacetic acid, hydroxyethylethylamine Power of acetic acid Rumium salt, sodium salt of hydroxyxetylethylenetriacetic acid, sodium salt of sodium triacetate, sodium salt of sodium triacetate
  • the addition amount of these chelating compounds is preferably in the range of 0.001 to 5% by weight, more preferably 0.005 to 1% by weight, based on the total weight of the fountain solution composition at the time of use. % Range.
  • the fountain solution composition of the present invention contains various kinds of auxiliary agents that are stably present in the fountain solution composition and do not hinder printability, such as various colorants, antioxidants, and antioxidant agents for non-image areas. Agents can be added.
  • coloring agents examples include food coloring agents, and specific examples thereof include I. No. 19140 and 15985 as yellow pigments and I. No. 161 as red pigments. 85, 45430, 16255, 45380, 45100, blue pigments such as I. No. 42090 and 73015, and green pigments such as I. No. 42095.
  • Suitable protective agents include benzotriazole and tril. Triabour, benzimidazole and 2-mercaptobenzimidazole.
  • antioxidant stain preventive agent for the non-image area examples include zinc nitrate, magnesium nitrate, and sodium nitrate.
  • the fountain solution composition of the present invention is preferably produced as a concentrated solution, diluted with tap water, well water or the like at the time of use to a dilution of 10 to 1 Q00, and is economically preferable.
  • the lithographic printing plate using the fountain solution composition of the present invention includes a photosensitive lithographic printing plate (PS plate), a lithographic printing plate, a bimetallic metal plate, a bimetallic metal plate, a trimetallic metal plate, a direct drawing master, and an electrophotographic lithographic printing plate.
  • PS plate photosensitive lithographic printing plate
  • lithographic printing plate a lithographic printing plate
  • bimetallic metal plate a bimetallic metal plate
  • a trimetallic metal plate a direct drawing master
  • electrophotographic lithographic printing plate Various lithographic printing plates such as plates.
  • a plate surface protective agent was obtained in exactly the same manner as in Example 1 except that water-soluble soybean hemicellulose (mouth) was used instead of water-soluble soybean hemicellulose (a).
  • a plate surface protective agent was obtained in exactly the same manner as in Example 1 except that water-soluble soybean hemicellulose (c) was used in place of water-soluble soybean hemicellulose (c).
  • a plate surface protective agent was obtained in the same manner as in Example 1 except that arabic gum was used instead of using water-soluble soybean hemicellulose (a).
  • Comparative Example 1 a plate surface protective agent was obtained in exactly the same manner as in Comparative Example 1 except that dextrin was used instead of using gum arabic.
  • dextrin was used instead of using gum arabic.
  • photosensitive lithographic printing plates were prepared.
  • an aluminum plate having a thickness of 0.241 mm was immersed in a 7% aqueous solution of sodium tertiary phosphate at 60 ° C, degreased, washed with water, and then poured with a liquid in which pumice was suspended in water. Grained with a nylon brush. After washing with water - 7 0 and kept at ° C silicic acid mosquito re um (. S i 0 2 / K 2 0 molar ratio of 2 0) crushed immersed 3 0-6 0 seconds 5% aqueous solution of, after thoroughly washed with water, dried did.
  • This printing plate was exposed using a dot negative film, and 0.3 parts of sodium sulfite, 2.8 parts of benzyl alcohol, 1.9 parts of triethanolamine, and 0.9 parts of monoethanolamine were used. After developing with an aqueous developing solution consisting of 5 parts, 1.0 part of t-butyl naphthylene sodium sulfonate and 93.5 parts of pure water, the film was washed with water and dried.
  • the printing plate was divided into six parts, and five of these were coated with the plate surface protective agents obtained in Examples and Comparative Examples, and excess was wiped off with a cloth. No surface protective agent was used for the remaining printing plate.
  • thermo-hygrostat After keeping for 3 days in a thermo-hygrostat at a humidity of 85%, printing was carried out using a Heidelberg K0R-D printing machine according to the usual method. Observations were made on the number of defective prints until a clear printed matter was obtained and the easiness of staining during printing.
  • the surface protective agent for a lithographic printing plate using water-soluble hemicellulose as a water-soluble polymer can be easily applied to the plate using a sponge, cotton tampon, automatic gumcoat, and the like. It has excellent oil sensitivity in the image area and desensitization property in the non-image area, and can be easily removed by washing with water or contact with a humidifying roller even after long-term storage. Furthermore, since the hydrophilicity of the non-image area and the lipophilicity of the image area can be maintained, no printing loss occurs in the lithographic printing plate processed by this method.
  • the solution was added dropwise to the solution prepared as described above while stirring and dispersed, and then emulsified through a homogenizer (manufactured by GAUL IN) to obtain a plate surface cleaning agent for a lithographic printing plate.
  • a homogenizer manufactured by GAUL IN
  • a plate surface cleaning agent was obtained in exactly the same manner as in Example 4 except that water-soluble soybean hemicellulose (c) was used instead of water-soluble soybean hemicellulose (c).
  • a plate cleaning agent was obtained in exactly the same manner as in Example 4 except that arabic gum was used instead of using water-soluble soybean hemicellulose (a).
  • a part of the non-image area on the obtained printing plate was damaged with a needle, and oleic acid was rubbed in.
  • the scratched portions were all stained. Wash each surface on the scratched printing plate
  • the contaminated area was wiped off using a cleaning agent, and a further 60,000 sheets were printed to confirm that the contaminated area was completely cleaned.
  • the above components were uniformly mixed to obtain an image erasing agent for a lithographic printing plate.
  • Example 6 was repeated except that water-soluble soybean hemicellulose (mouth) was used instead of water-soluble soybean hemicellulose (a). An image erasing agent was obtained in exactly the same manner as in 6.
  • An image erasing agent was obtained in exactly the same manner as in Example 6 except that water-soluble soybean hemicellulose (c) was used instead of water-soluble soybean hemicellulose (c).
  • An image erasing agent was obtained in the same manner as in Example 6 except that arabic gum was used instead of using water-soluble soybean hemicellulose (a).
  • a positive photosensitive lithographic printing plate was prepared by applying a mixture of diazoxide resin and phenol resin as a photosensitive layer on a grained and anodized aluminum plate.
  • an image was formed on a printing plate by exposing the image through a mesh screen and developing with an alkaline developer.
  • An appropriate amount of each of the above-described image erasing agents was applied to a part of this image with a brush and left for 2 minutes. Thereafter, the erasing agent was washed away with running water, and after draining, a gumming treatment was performed.
  • Comparative Example 4 35 As described above, when water-soluble hemicellulose was used, an image erasing agent excellent in anti-washing ability and image erasing stability was obtained.
  • a lithographic printing plate image erasing agent using water-soluble hemicellulose as a water-soluble polymer can be easily prepared simply by mixing the respective components, and is applied to the image portion to be erased. It was confirmed that the resin had excellent effects of preventing unwashed portions and stability of erasing images.
  • a fountain solution composition was obtained in exactly the same manner as in Example 9 except that water-soluble soybean hemicellulose (p) was used instead of water-soluble soybean hemicellulose (p).
  • Example 9 the water-soluble soybean hemicellulose (a) Instead, except that water-soluble soybean hemicellulose (c) was used,
  • a fountain solution composition was obtained in exactly the same manner as in 9.
  • a fountain solution composition was obtained in the same manner as in Example 9 except that arabic gum was used in place of water-soluble soybean hemicellulose (a).
  • Comparative Example 5 a fountain solution composition was obtained in exactly the same manner as in Comparative Example 5, except that dextrin was used instead of gum arabic.
  • a fountain solution composition was obtained in the same manner as in Example 12 except that gum arabic was used instead of using water-soluble soybean hemicellulose (a). '
  • dampening water determines the amount of dampening water (minimum water level i) that does not cause stains when printing 10,000 sheets, and print using various dampening water with this minimum water level. The evaluation is based on the number of printed sheets until the prints are stained.
  • the fountain solution composition for lithographic printing obtained using water-soluble hemicellulose can be easily prepared as a concentrated solution simply by mixing the components, and this concentrated solution is used in tap water or well water. It can be used simply by diluting it. Furthermore, they have properties as dampening solution compositions such as metering roll stain control, readability, emulsion stability and continuous stability. It was excellent. Industrial applicability
  • the lithographic printing plate surface protective agent obtained using water-soluble hemicellulose as a lithographic printing plate aid can be easily applied to the plate using a sponge, cotton tampon, automatic gumco, etc. Also, it has excellent oil sensitivity in the image area and desensitization property in the non-image area. Even after long-term storage, it can be easily removed by washing with water or contact with a humidifier. Furthermore, since the hydrophilicity of the non-image area and the lipophilicity of the image area can be maintained, no printing loss occurs in the lithographic printing plate processed by this method.
  • an image erasing agent for lithographic printing plates obtained using water-soluble hemicellulose as a lithographic printing plate auxiliary can be easily prepared simply by mixing the respective components, and is applied to the image portion to be erased. When applied, it has an excellent effect of preventing residual washing and erasing stability of images.
  • the fountain solution composition for lithographic printing obtained by using water-soluble hemicellulose has a dampening solution composition such as a property of inhibiting the contamination of metering rolls, a bleeding property, an emulsifying stability and a continuous stability. It has excellent effects as a product.
  • the printing aid containing water-soluble hemicellulose as an active ingredient has a film-forming property, a long-term storage property, an emulsifying property, and a non-image area insensitivity even when compared with known water-soluble polymers. It has excellent properties of oiliness. Therefore, the present invention is extremely useful industrially.

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  • Photosensitive Polymer And Photoresist Processing (AREA)

Abstract

Adjuvant d'impression renfermant comme constituant actif de l'hémicellulose hydrosoluble. Cet adjuvant présente d'excellentes caractéristiques filmogènes, une longue durée de conservation, d'excellentes caractéristiques d'émulsification, d'excellentes caractéristiques de désensibilisation pour les parties sans image, ainsi qu'une excellente stabilité d'émulsification et une stabilité continue comme composition aqueuse humectante pour l'impression.
PCT/JP1993/001535 1992-11-02 1993-10-22 Adjuvant d'impression WO1994009993A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE69323999T DE69323999T2 (de) 1992-11-02 1993-10-22 Lithographisches druckverfahren und verwendung von wasserlöslicher hemicellulose als druckereihilfsmittel für lithographische druckplatten
EP93923053A EP0620125B1 (fr) 1992-11-02 1993-10-22 Procede d' impression lithographique et utilisation de hemicellulose soluble dans l'eau comme adjuvant d'impression pour des plaques d'impression lithographiques
KR1019940702295A KR100192147B1 (ko) 1992-11-02 1993-10-22 인쇄용 조제
US08/436,590 US5615613A (en) 1992-11-02 1995-05-08 Method of using a hemicellulose printing assistant for lithographic printing plates

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP4/317829 1992-11-02
JP4/317828 1992-11-02
JP31782992 1992-11-02
JP31782892 1992-11-02
JP05114318A JP3052663B2 (ja) 1992-11-02 1993-05-17 印刷用助剤
JP5/114318 1993-05-17
US08/265,443 US5468287A (en) 1992-11-02 1994-06-24 Water color

Publications (1)

Publication Number Publication Date
WO1994009993A1 true WO1994009993A1 (fr) 1994-05-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1993/001535 WO1994009993A1 (fr) 1992-11-02 1993-10-22 Adjuvant d'impression

Country Status (2)

Country Link
EP (1) EP0620125B1 (fr)
WO (1) WO1994009993A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0638436A1 (fr) * 1993-08-12 1995-02-15 Fuji Photo Film Co., Ltd. Agent protecteur de surface et agent de nettoyage pour plaques lithographiques

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5826514A (en) * 1995-10-19 1998-10-27 Technicas Especiales De Oxigenacion, S.L. Introduced in wetting systems for offset printing and a mechanism for their application
EP2002987B1 (fr) * 2007-06-13 2014-04-23 Agfa Graphics N.V. Procédé pour traiter une plaque d'impression lithographique
EP2065211B1 (fr) 2007-11-30 2010-05-26 Agfa Graphics N.V. Procédé pour traiter une plaque d'impression lithographique

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JPS5256603A (en) * 1975-10-31 1977-05-10 Sumitomo Chemical Co Liquid of forming protection film for lithographic press plate
JPS62275782A (ja) * 1986-02-05 1987-11-30 Fuji Photo Film Co Ltd 平版印刷版用版面保護剤
JPH04235096A (ja) * 1990-12-19 1992-08-24 Fuji Photo Film Co Ltd 平版印刷用湿し水組成物及び平版印刷方法

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US4186250A (en) * 1975-04-07 1980-01-29 The Dow Chemical Company Method of desensitizing image-bearing lithographic plates
JPS56112982A (en) * 1980-02-12 1981-09-05 Kiyoshi Fukui Size composition and processing method
JP2990937B2 (ja) * 1992-03-11 1999-12-13 不二製油株式会社 繊維加工用糊剤
US5700397A (en) * 1992-06-16 1997-12-23 Fuji Oil Co., Ltd. Emulsifier, emulsion composition, and powder composition

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Publication number Priority date Publication date Assignee Title
JPS5256603A (en) * 1975-10-31 1977-05-10 Sumitomo Chemical Co Liquid of forming protection film for lithographic press plate
JPS62275782A (ja) * 1986-02-05 1987-11-30 Fuji Photo Film Co Ltd 平版印刷版用版面保護剤
JPH04235096A (ja) * 1990-12-19 1992-08-24 Fuji Photo Film Co Ltd 平版印刷用湿し水組成物及び平版印刷方法

Non-Patent Citations (1)

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Title
See also references of EP0620125A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0638436A1 (fr) * 1993-08-12 1995-02-15 Fuji Photo Film Co., Ltd. Agent protecteur de surface et agent de nettoyage pour plaques lithographiques

Also Published As

Publication number Publication date
EP0620125A1 (fr) 1994-10-19
EP0620125B1 (fr) 1999-03-17
EP0620125A4 (fr) 1995-03-29

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