EP0034788B1 - Lackemulsion und Verfahren zum Herstellen von Flachdruckformen - Google Patents

Lackemulsion und Verfahren zum Herstellen von Flachdruckformen Download PDF

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Publication number
EP0034788B1
EP0034788B1 EP81101097A EP81101097A EP0034788B1 EP 0034788 B1 EP0034788 B1 EP 0034788B1 EP 81101097 A EP81101097 A EP 81101097A EP 81101097 A EP81101097 A EP 81101097A EP 0034788 B1 EP0034788 B1 EP 0034788B1
Authority
EP
European Patent Office
Prior art keywords
water
weight
percent
component
emulsion
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.)
Expired
Application number
EP81101097A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0034788A1 (de
Inventor
Gerhard Dr. Sprintschnik
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.)
Hoechst AG
Original Assignee
Hoechst AG
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 Hoechst AG filed Critical Hoechst AG
Priority to AT81101097T priority Critical patent/ATE7874T1/de
Publication of EP0034788A1 publication Critical patent/EP0034788A1/de
Application granted granted Critical
Publication of EP0034788B1 publication Critical patent/EP0034788B1/de
Expired legal-status Critical Current

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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 invention relates to a coating emulsion which is suitable for the simultaneous development and coating of exposed photosensitive planographic printing plates.
  • MAK maximum workplace concentration
  • US Pat. No. 3,019,106 describes a treatment emulsion for exposed printing plates which essentially consists of a) a water-insoluble organic solvent which is the dispersed phase, b) an aqueous hydrophilization (preservation) solution and c) a solution in the organic solvent Dye exists.
  • the treatment emulation should combine the three treatment stages: development, hydrophilization and painting into one stage.
  • the organic solvent should have a boiling point between 100 and 200 ° C, where as u. a. is also called benzyl alcohol.
  • Water-soluble organic solvents can optionally also be added as further components as emulsifying agents, plasticizers or resins.
  • the known substances such as phosphates, gum arabic or the like are present in the aqueous hydrophilization solution.
  • the treatment emulsion is especially suitable for tin amates of polymeric polyalcohols as a photosensitive compound or for other photopolymerizable compounds.
  • the paint emulsion according to DE-A 14 47 961 contains an aqueous phase with a colloid and a wetting agent and a non-aqueous phase with an organic solvent and a phenol formaldehyde resin.
  • Organic solvents such as ketones, esters or aromatics do not include araliphatic alcohols; the isopropanol listed in Example 1 is not an araliphatic alcohol.
  • a coating emulsion which contains an aqueous phase with a hydrocolloid and a non-aqueous phase with a polyvinylphenol resin and a water-insoluble organic solvent such as an ester or ketone.
  • the amount of water and the amount of organic solvent are approximately of the same order of magnitude, and the amount of all organic solvents can even be higher.
  • the flash point of such paints is usually relatively low, i. H. approximately between 50 and 60 ° C.
  • a developer emulsion for subtractive development - that is, a development in which only the non-image areas are washed out - from exposed printing plates
  • the emuslion does not contain any water-insoluble to reinforce oleophilic image areas suitable polymer and is not intended for painting printing plates.
  • the object of the invention is to find a coating emulsion for planographic printing plates, which is suitable for the simultaneous development and coating of planographic printing plates, which is free of volatile, toxic, unpleasant smelling solvents, which overall contains only a relatively small proportion of organic solvents, which is flame retardant and enables rapid development.
  • the invention is based on the paint emulsion shown in the preamble of claim 1, which is characterized according to the invention by the features listed in the characterizing part of this claim.
  • Suitable hydrophilic water-soluble or water-dispersible polymers are those substances which either dissolve in water in the required concentrations to give a clear, optically homogeneous solution or which form a stable dispersion when mixed with water without the addition of dispersants.
  • Water-insoluble polymers are to be understood as compounds which can neither be dissolved in water without the addition of auxiliaries nor dispersed to form a stable dispersion.
  • hydrophilic water-dispersible polymers
  • copolymers of hydrophilic units for. B. vinylamines or vinyl alcohol and their derivatives, and hydrophobic units with long-chain alkyl radicals.
  • Such copolymers have the property of reducing the surface tension of the water and additionally stabilizing the emulsion.
  • the hydrophilic units must be such that their homopolymers are water-soluble.
  • the polymers can contain other units which themselves form water-insoluble homopolymers, but do not significantly reduce the surface tension, e.g. B. units of vinyl acetate or lower alkyl acrylates.
  • the proportion of the hydrophilic monomers must be at least high enough to ensure the solubility or dispersibility stated above in water.
  • the vinylamine derivatives in particular N-acylated vinylamine derivatives having a tertiary nitrogen atom, are preferred as hydrophilic units.
  • Preferred long-chain hydrophobic units are those which are derived from alkyl esters of unsaturated carboxylic acids having 4 to 30, preferably 6 to 20 carbon atoms in the alkyl group, from vinylaromatic compounds or from vinyl alkyl esters with 4 to 30, preferably 6 to 20 carbon atoms in the alkyl group.
  • Acrylic, methacrylic and maleic acids are particularly suitable as unsaturated carboxylic acids.
  • the proportion of the copolymer in hydrophobic monomer units is between 0.5 and 25 mol%.
  • Examples of monomers which form suitable hydrophobic units are vinyl versatic acid, vinyl isononanoate, diamine maleic acid, ethylhexyl acrylate, decyl methacrylate, lauryl acrylate and 4-octyl styrene.
  • homopolymers of the specified hydrophilic monomers and copolymers of these monomers and relatively low molecular weight hydrophobic monomers, such as vinyl acetate, short-chain alkyl acrylates and styrene, are suitable.
  • cellulose ethers such as methyl cellulose, carboxymethyl cellulose, hydroxyalkyl cellulose, salts and esters of alginic acid
  • polyvinyl lactams such as polyvinyl pyrrolidone and its copolymers with vinyl acetate
  • polyacrylic acid amide polyacrylic acid amide
  • polyvinylacetidinone water-soluble natural polymers such as gum arabic and dextrins.
  • the polymer is used alone or in a mixture with another polymer, depending on the molecular weight, in concentrations of 0.05 to 25, preferably 3-15% by weight.
  • the amount used should be sufficient to stabilize the emulsion and to hydrophilize the image-free support, on the other hand, the viscosity of the solution should not be too high so as not to make processing more difficult.
  • the lacquer contains at least one limited or practically immiscible water, non-smelling, slightly toxic, high-boiling arylalkanol or aryloxyalkanol, for example 1-phenylethanol, 2-phenylethanol, 3-phenylpropanol-1, 4-phenyl-butanol-1, 4-phenyl-butanol-2, 2-phenyl-butanol-1, 2-phenoxy-ethanol, 2-benzyloxy-ethanol, o-methoxybene, cyl alcohol, m-methoxybenzyl alcohol, p-methoxybenzyl alcohol , Benzyl alcohol or mixtures of such alcohols.
  • arylalkanol or aryloxyalkanol for example 1-phenylethanol, 2-phenylethanol, 3-phenylpropanol-1, 4-phenyl-butanol-1, 4-phenyl-butanol-2, 2-phenyl-butanol-1, 2-phenoxy-ethanol, 2-benzyl
  • the amount of this solvent must of course - as in the subtractive development - be matched to the planographic printing plate to be processed and is 4-20, preferably 6-15% by weight.
  • the paint emulsion contains in a small amount of 0.02-1.0% by weight at least one surface-active substance, which can be anionic, cationic and / or nonionic.
  • the emulsion also contains at least one mineral, fine-grained filler, e.g. B. talc or mineral multi-component systems, the amount of 5-35, preferably 13-25 wt .-% of the emulsion.
  • at least one mineral, fine-grained filler e.g. B. talc or mineral multi-component systems, the amount of 5-35, preferably 13-25 wt .-% of the emulsion.
  • the pH can be acidic, with suitable buffer salts, e.g. B. sodium metasilicate, made alkaline.
  • suitable buffer salts e.g. B. sodium metasilicate
  • the lacquer also contains at least one film-forming, oleophilic polymer, which has a high Has affinity for the image-bearing layer components and forms a closed, mechanically stressable oleophilic film.
  • Modified and unmodified epoxy resins and phenolic condensation resins such as resols or novolaks or their reaction products with isocyanates are preferred.
  • Other resins e.g. B. blocked isocyanate resins or copolymers of vinyl chloride, silicone resins or alkyd resins can be used.
  • Such resins are known and are described in connection with paint emulsions in DE-B 1 143 710, 1 268 972 and 1 194 260.
  • the amount of oleophilic resin used depends on the nature of the resin and is between 2 and 8, preferably 3-6% by weight.
  • Carbon black is usually used to color the paint emulsion, but other colored organic or inorganic pigments and soluble dyes can also be used.
  • the paint emulsion according to the invention is preferably colored with pigment dough dispersions in which the pigment is finely dispersed with the aid of surface-active substances, e.g. B. in a mixture of water and ethylene glycol, is kept in suspension. Such preparations are commercially available in a wide variety.
  • the amount of pigment solid substance added is 0.3-6, preferably 0.5-2.5% by weight, based on the total emulsion.
  • the paint emulsion can still other organic solvents such.
  • B. polyhydric alcohols, such as glycerol, ethylene glycol, sorbitol, pentaerythritol and polyalkylene glycols, as well as ketones, esters and aliphatic alcohols can be added in a smaller amount if this is desired due to the composition of the copying layer. In the interest of the desired properties of an environmentally friendly lacquer mentioned at the beginning, however, the amount added should be as small as possible.
  • a sponge or cloth soaked in the paint emulsion can be quickly rubbed onto an already subtractively developed plate.
  • the application of the lacquer can be recognized by the intense coloring of the oleophilic layer components.
  • Gravimetric investigations showed that a layer weight of up to 5 g / m 2 can be applied to the existing layer. Varnishes that apply an additional layer of 1-3 g / m 2 have proven to be particularly good. It is also possible to formulate printing plates that can be developed and varnished with this varnish in one step. This type of processing is preferred.
  • Printing forms produced in this way can usually print 50-100% longer print runs than corresponding subtractive printing forms.
  • a suitable coating composition a further increase in the circulation performance can be achieved by thermal post-treatment (baking).
  • the coating according to the invention also ensures that smaller amounts of light are often required to expose negative working copy layers than when the same layer is developed subtractively.
  • the processing according to the invention thus results in increased practical sensitivity to light.
  • the coating emulsions according to the invention are preferably used for negative-working layers which consist predominantly of a diazopolycondensate and a water-insoluble polymeric binder.
  • these emulsions can also be used to coat exposed and possibly developed photopolymerizable copying layers.
  • Suitable binders for such layers are polymeric vinyl esters, e.g. B.
  • Phenol and cresol formaldehyde resins those whose free epoxy groups have been reacted with organic or inorganic acids
  • Phenol and cresol formaldehyde resins urea formaldehyde resins, melamine formaldehyde resins, polyurethane resins, namely both branched and linear as well as polyurethanes with terminal isocyanate groups
  • Copolymers of reactive monomers such as N-methylol-acrylamide or acetoacetylethyl acrylate with vinyl esters, acrylates, methacrylates and the like.
  • binders with light-sensitive components to form light-sensitive layers
  • These layers usually also contain pigments, dyes, indicators, acids, plasticizers, water-soluble polymers, surface-active substances and the like. These additives are also known to the person skilled in the art.
  • Suitable layers are e.g. B. in DE-A 20 24 244, 20 34 654, 20 34 655, 20 39 861, 23 31 377, 27 39 774, 28 22 887, 28 34 059 and US-A 3,660,097.
  • the materials usually used for printing plates such as paper, Plastic films, aluminum, copper, zinc, steel and the like.
  • Aluminum is particularly preferred, for this purpose it is usually mechanically, chemically or electrochemically roughened and then optionally anodically oxidized.
  • a further treatment of this carrier material with polyvinylphosphonic acid, phosphate, silicate, hexafluorozirconate, chromate, borate, polyacrylamide, cellulose derivatives or the like can be advantageous.
  • the additively developed printing form delivered a print run that was 60% higher than that of the subtractively developed in an offset printing press.
  • Example 2 Again, the exposure time compared to subtractive development could be shortened as in Example 1, the print run was increased by approximately 50%.
  • a printing form produced in this way delivered a print run at least three times as high as that achieved with subtractive development.
  • the plate was then treated with the varnish described in Example 3 to achieve a higher print run.

Landscapes

  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Paints Or Removers (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
EP81101097A 1980-02-25 1981-02-17 Lackemulsion und Verfahren zum Herstellen von Flachdruckformen Expired EP0034788B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81101097T ATE7874T1 (de) 1980-02-25 1981-02-17 Lackemulsion und verfahren zum herstellen von flachdruckformen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803006964 DE3006964A1 (de) 1980-02-25 1980-02-25 Lackemulsion und verfahren zum herstellen von flachdruckformen
DE3006964 1980-02-25

Publications (2)

Publication Number Publication Date
EP0034788A1 EP0034788A1 (de) 1981-09-02
EP0034788B1 true EP0034788B1 (de) 1984-06-13

Family

ID=6095471

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81101097A Expired EP0034788B1 (de) 1980-02-25 1981-02-17 Lackemulsion und Verfahren zum Herstellen von Flachdruckformen

Country Status (6)

Country Link
EP (1) EP0034788B1 (enrdf_load_stackoverflow)
JP (1) JPS56133739A (enrdf_load_stackoverflow)
AT (1) ATE7874T1 (enrdf_load_stackoverflow)
AU (1) AU543400B2 (enrdf_load_stackoverflow)
CA (1) CA1145997A (enrdf_load_stackoverflow)
DE (2) DE3006964A1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1228204A (en) * 1982-03-29 1987-10-20 Richard J. Burns Fountain solution
DE3908764C2 (de) * 1989-03-17 1994-08-11 Basf Ag Entwickler für die Herstellung photopolymerisierter flexographischer Reliefdruckformen
JPH03234595A (ja) * 1990-02-09 1991-10-18 Fuji Photo Film Co Ltd 平版印刷版用版面保護剤

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1447961A1 (de) * 1965-11-09 1968-11-21 Kalle Ag Lackemulsion zur Nachbehandlung entwickelter Flachdruckformen
US3615791A (en) * 1966-10-24 1971-10-26 Lithoplate Inc Lacquer emulsions for lithographic plates and method for their manufacture
FR2242706A1 (enrdf_load_stackoverflow) * 1973-09-03 1975-03-28 Oce Van Der Grinten Nv
DE2408148A1 (de) * 1974-02-20 1975-09-04 Forschungsgesellschaft Fuer Dr Verwendung eines wischwasser-zusatzes beim offsetdruck

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3019106A (en) * 1959-06-30 1962-01-30 Algraphy Ltd Processing of pre-sensitised lithographic printing plates
DE2809774A1 (de) * 1978-03-07 1979-09-13 Hoechst Ag Verfahren und entwicklerloesung zum entwickeln von belichteten lichtempfindlichen kopierschichten

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1447961A1 (de) * 1965-11-09 1968-11-21 Kalle Ag Lackemulsion zur Nachbehandlung entwickelter Flachdruckformen
US3615791A (en) * 1966-10-24 1971-10-26 Lithoplate Inc Lacquer emulsions for lithographic plates and method for their manufacture
FR2242706A1 (enrdf_load_stackoverflow) * 1973-09-03 1975-03-28 Oce Van Der Grinten Nv
DE2408148A1 (de) * 1974-02-20 1975-09-04 Forschungsgesellschaft Fuer Dr Verwendung eines wischwasser-zusatzes beim offsetdruck

Also Published As

Publication number Publication date
JPH0231375B2 (enrdf_load_stackoverflow) 1990-07-12
JPS56133739A (en) 1981-10-20
AU543400B2 (en) 1985-04-18
DE3164044D1 (en) 1984-07-19
DE3006964A1 (de) 1981-09-10
CA1145997A (en) 1983-05-10
ATE7874T1 (de) 1984-06-15
AU6739581A (en) 1981-09-03
EP0034788A1 (de) 1981-09-02

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