EP0322658B1 - Damping solution for offset printing - Google Patents

Damping solution for offset printing Download PDF

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Publication number
EP0322658B1
EP0322658B1 EP88120958A EP88120958A EP0322658B1 EP 0322658 B1 EP0322658 B1 EP 0322658B1 EP 88120958 A EP88120958 A EP 88120958A EP 88120958 A EP88120958 A EP 88120958A EP 0322658 B1 EP0322658 B1 EP 0322658B1
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EP
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Prior art keywords
damping solution
solution
dampening solution
printing
offset printing
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EP88120958A
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German (de)
French (fr)
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EP0322658A1 (en
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Harald Dr. Lauke
Gregor Dr. Schuermann
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BASF SE
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BASF SE
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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

  • Offset printing plates generally consist of a layer support on which a radiation-sensitive reproduction layer is applied, with the aid of which an image is photomechanically generated from a template. After the printing form has been produced, the layer support carries the color-bearing image areas during later printing and at the same time forms the water-bearing image background in the non-image areas (non-image areas).
  • an aqueous dampening solution is generally applied to the plate surface during the printing process.
  • the dampening solution is applied to the plate by one or more rollers.
  • At least one ink roller which is covered with an oil-based ink, contacts the entire surface of the plate, but only colors the hydrophobic image areas because of the oil-repellent properties of the non-image areas.
  • the dampening solution and at least part of the oil-based ink can be applied to the plate simultaneously with a roller.
  • Agents such as gum arabic, glycerol and the like for hydrophilization have long been known, which usually contain additions of phosphates, citrates or corresponding acids, which act as buffers and set the pH range of 4.5 and 6, which is particularly favorable for offset printing.
  • the natural product gum arabic fluctuates in quality and, as a component in dampening solutions, leads to excessive emulsification of the printing ink, which results in uneven coloring of the printing plate.
  • EP-A-0091601 describes a dampening solution which contains water-miscible or water-soluble polymers instead of the isopropanol also used, cellulose ethers, polyacrylamides, polyvinyl alcohols or chemically modified rubber products being used in particular.
  • US-A-4186250 describes mixtures of polyacrylamides with polycarboxylic acids or their alkali metal salts. Such solutions have the same shortcomings as have already been described for the polymers.
  • US-A-4374036 describes a dampening solution which contains polyphosphates, water-soluble polyethylene glycols, carboxymethyl cellulose, nonionic or anionic surfactants of the alkyl orthophosphate and alkyl polyphosphate type and a polysiloxane.
  • a disadvantage is the inadequate hydrolysis stability of polyphosphates, so that work must be carried out in the neutral range, although in practice pH values around 5 have proven to be better.
  • Moisturizing solutions for offset printing which contain aminomethylenephosphonic acid and / or their derivatives, have already been proposed.
  • the present invention relates to an aqueous dampening solution for the offset printing process, which is characterized in that the solution is a hydrolyzate of a compound of the general formula (I) wherein R1 and R2 are the same or different from each other and represent hydrogen, an alkyl radical with 1 to 9 carbon atoms or an aryl radical with 6 to 12 carbon atoms, or contains condensates of this hydrolyzate.
  • R1 and R2 are the same or different from each other and represent hydrogen, an alkyl radical with 1 to 9 carbon atoms or an aryl radical with 6 to 12 carbon atoms, or contains condensates of this hydrolyzate.
  • the compounds of the general formula (I) can also be present, at least in part, in the form of their salts, and additionally contain a buffer system, a biocide, a corrosion inhibitor, glycol and / or alcohol.
  • the dampening solution can be in the form of a concentrate, which may contain 0.01 to 100 g / l of the compound of the general formula (I).
  • the pH of the dampening solution is expediently in the range between 3.0 and 7.0, preferably between 4.0 and 5.5.
  • the hydrophilization of the non-image areas of the printing plate is renewed during the offset printing process, whereby toning is prevented until the end of the printing process.
  • a particular advantage of the moistening solution according to the invention is that disturbances caused by hard water or cations which have been introduced are prevented.
  • Another important advantage of the dampening solution according to the invention is that the compound of the general formula (I), in particular [2- (trihydroxysilyl) ethyl] phosphonic acid and its salts, are easily accessible from inexpensive raw materials and can be prepared in a constant quality and also in higher concentrations can be used.
  • Silanes of the general formula (I), e.g. [2- (trialkoxysilyl) ethyl] phosphonic acid dimethyl ester or [2- (trialkoxysilyl) ethyl] phosphonic acid diethyl ester such as e.g. the [2- (trimethoxysilyl) ethyl] phosphonic acid dimethyl ester or diethyl ester can be prepared in a conventional manner, e.g. as described in US-PS 3780127 and US-PS 3816550, in conc. Hydrochloric acid can be hydrolyzed. After removing excess hydrochloric acid, the product obtained in this way can be diluted with water.
  • condensates can also form during hydrolysis.
  • hydrolyzates and condensates as well as mixtures of hydrolyzates and condensates of the compounds of general formula (I) can be used according to the invention for the dampening solution, as long as it is ensured that the hydrolyzates or their condensates are completely dissolved or homogeneous in aqueous or alcoholic / aqueous solution are distributed.
  • Suitable salts of the hydrolysates are their alkali and alkaline earth salts, in particular their Na+, K+ and NH4+ salts.
  • the hydrolyzates and / or their condensates or their salts are generally present in the dampening solution according to the invention in amounts of 0.01 to 10, preferably 0.1 to 2% by weight, based on the total amount of the dampening solution.
  • the pH of the dampening solution is expediently adjusted to a pH between 3 and 7, preferably between 4 and 5.5.
  • the dampening solution according to the invention can also be stored in the form of a concentrate which contains up to 100 g / l of hydrolyzate of a compound of the general formula (I), its condensate or salts, and, if appropriate, the additives mentioned above.
  • dampening solution according to the invention it is possible to maintain the hydrophilicity and thus the water-carrying properties of the non-image areas during the printing process, without sticky deposits and disturbances caused thereby, for example when using high-molecular compounds.
  • An electrolytically roughened and anodized aluminum plate is immersed in the dampening solution to be tested and then dried.
  • the entire plate is then printed with offset ink in a sample printing device. After the ink has dried somewhat, the plate is again placed in the dampening solution and the time taken for the printing ink to detach from the plate. The faster this happens, the better the humectant works.
  • Example 2 The experiment described in Example 2 was repeated with the change that this time no [2- (trihydroxysilyl) ethyl] phosphonic acid was added to the solution. The color only came off the plate after several hours.

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  • Printing Plates And Materials Therefor (AREA)

Description

Die Erfindung betrifft eine wäßrige Befeuchtungslösung zur Verhinderung der Farbannahme von Nichtbildstellen während des Offset-Druckvorganges und zur weitgehenden Verminderung von Störungen durch Fremdionen. Offsetdruckplatten bestehen im allgemeinen aus einem Schichtträger, auf dem eine strahlungsempfindliche Reproduktionsschicht aufgebracht ist, mit deren Hilfe von einer Vorlage ein Bild auf photomechanischem Wege erzeugt wird. Nach der Herstellung der Druckform trägt der Schichtträger die beim späteren Drucken farbführenden Bildstellen und bildet zugleich an den bildfreien Stellen den wasserführenden Bildhintergrund (Nichtbildstellen).The invention relates to an aqueous dampening solution for preventing the color acceptance of non-image areas during the offset printing process and for substantially reducing interference from foreign ions. Offset printing plates generally consist of a layer support on which a radiation-sensitive reproduction layer is applied, with the aid of which an image is photomechanically generated from a template. After the printing form has been produced, the layer support carries the color-bearing image areas during later printing and at the same time forms the water-bearing image background in the non-image areas (non-image areas).

Man verlangt daher von einem Schichtträger, der für lichtempfindliches Material zum Herstellen einer Druckplatte geeignet sein soll, einerseits, daß die aus der Kopierschicht des Materials entwickelten druckenden Bildstellen auf ihm sehr fest haften, und andererseits, daß er einen hydrophilen Bilduntergrund darstellt und seine abstoßende Wirkung gegenüber oleophilen Druckfarben unter den Anforderungen des Druckprozesses beibehält.It is therefore required of a layer support which is to be suitable for light-sensitive material for producing a printing plate, on the one hand that the printing image areas developed from the copying layer of the material adhere very firmly to it, and on the other hand that it represents a hydrophilic background and its repellent effect compared to oleophilic printing inks under the requirements of the printing process.

Während des Druckvorgangs wird im allgemeinen neben der Druckfarbe eine wäßrige Befeuchtungslösung auf die Plattenoberfläche aufgebracht.In addition to the printing ink, an aqueous dampening solution is generally applied to the plate surface during the printing process.

Deren Aufgabe ist es, alle nicht vom hydrophoben Bild bedeckten Teile feucht zu halten, um somit zu gewährleisten, daß diese Nichtbildstellen während des Druckvorgangs hydrophobe Druckfarbe abstoßen. In herkömmlichen Systemen wird die Befeuchtungslösung auf die Platte durch eine oder mehrere Walzen bzw. Rollen aufgebracht. Mindestens eine Druckfarbenwalze, die mit einer Druckfarbe auf Ölbasis bedeckt ist, kontaktiert die gesamte Oberfläche der Platte, färbt jedoch wegen der ölabweisenden Eigenschaften der Nichtbildstellen nur die hydrophoben Bildstellen ein.Their task is to keep all parts not covered by the hydrophobic image moist, in order to ensure that these non-image areas repel hydrophobic ink during the printing process. In conventional systems, the dampening solution is applied to the plate by one or more rollers. At least one ink roller, which is covered with an oil-based ink, contacts the entire surface of the plate, but only colors the hydrophobic image areas because of the oil-repellent properties of the non-image areas.

Alternativ kann man auch die Befeuchtungslösung und mindestens einen Teil der Druckfarbe auf Ölbasis auf die Platte gleichzeitig mit einer Walze aufbringen.Alternatively, the dampening solution and at least part of the oil-based ink can be applied to the plate simultaneously with a roller.

Im einfachsten Fall wird als Befeuchtungslösung Wasser verwendet. Den hohen Anforderungen des Offsetdrucks genügt dies jedoch in vielen Fällen nicht und es kommt häufig zu Störungen im Sinne einer Farbannahme an Nichtbildstellen.In the simplest case, water is used as the dampening solution. In many cases, however, this does not meet the high demands of offset printing and there are often disturbances in the sense of color acceptance at non-image areas.

Seit langem sind Mittel wie Gummi arabicum, Glycerin und ähnliches zur Hydrophilierung bekannt, die gewöhnlich Zusätze von Phosphaten, Citraten oder entsprechende Säuren enthalten, welche als Puffer wirken und den für den Offsetdruck besonders günstigen pH-Bereich von 4,5 und 6 einstellen.Agents such as gum arabic, glycerol and the like for hydrophilization have long been known, which usually contain additions of phosphates, citrates or corresponding acids, which act as buffers and set the pH range of 4.5 and 6, which is particularly favorable for offset printing.

Das Naturprodukt Gummi arabicum schwankt in seiner Qualität und führt als Bestandteil in Befeuchtungslösungen zu einem übermäßigen Emulgieren der Druckfarbe, was eine ungleichmäßige Einfärbung der Druckplatte zur Folge hat.The natural product gum arabic fluctuates in quality and, as a component in dampening solutions, leads to excessive emulsification of the printing ink, which results in uneven coloring of the printing plate.

Ersatzstoffe für Gummi arabicum sind in der Literatur bekannt. So ist in der DE-A-2625604 (entspr. US-A-4116896) eine Befeuchtungslösung beschrieben, die erstens mehrwertige Metallionen, zweitens mindestens etwa 97 Gew.% Lösungsmittel, wobei das Lösungsmittel aus mindestens einem einwertigen oder mehrwertigen Niedrig-Alkylalkohol oder Glykolether mit einem Molekulargewicht von etwa 170 oder weniger und mindestens etwa 75 Vol.% Wasser besteht, und drittens 0,001 bis 0,5 Gew.% einer ausgewählten aktiven Polymerkomponente enthält.Substitutes for gum arabic are known in the literature. DE-A-2625604 (corresponding to US-A-4116896) describes a dampening solution which firstly contains polyvalent metal ions, secondly at least about 97% by weight of solvent, the solvent consisting of at least one monovalent or polyvalent low-alkyl alcohol or glycol ether having a molecular weight of about 170 or less and at least about 75% by volume of water, and thirdly containing 0.001 to 0.5% by weight of a selected active polymer component.

Nachteilig ist bei der Verwendung von Polymeren, daß ein Antrocknen zum Kleben oder zur Verschmutzung der Druckmaschine führt. In der DE-B-1121632 (entspr. US-A-3108535) wird ein wäßriges Feucht- und Reinigungsmittel für das Offsetdruckverfahren vorgeschlagen, das Polyvinylphosphonsäure, Vinylphosphonsäure oder Mischungen der Komponenten mit Glycerin, gegebenenfalls unter Zusatz von für Befeuchtungslösungen bekannten Substanzen, wie Ammoniumphosphat, Citrate, Carboxymethylcellulose u.a. enthält.A disadvantage of using polymers is that drying on leads to sticking or soiling of the printing press. In DE-B-1121632 (corresponding to US-A-3108535) an aqueous dampening and cleaning agent for the offset printing process is proposed which contains polyvinylphosphonic acid, vinylphosphonic acid or mixtures of the components with glycerol, optionally with the addition of substances known for dampening solutions, such as ammonium phosphate , Citrates, carboxymethyl cellulose and others contains.

Der Nachteil solcher Lösungen besteht einerseits in einem unangenehmen Geruch, andererseits in einer teuren Herstellungsprozedur. In der EP-A-0091601 wird eine Befeuchtungslösung beschrieben, die statt des auch verwendeten Isopropanols wassermischbare oder -lösliche Polymere enthält, wobei vor allem Celluloseether, Polyacrylamide, Polyvinylalkohole oder chemisch modifizierte Gummiprodukte eingesetzt werden. In der US-A-4186250 werden Mischungen von Polyacrylamiden mit Polycarbonsäuren oder deren Alkalimetallsalzen beschrieben. Bei solchen Lösungen bestehen die gleichen Mängel, wie sie bereits für die Polymeren beschrieben sind.The disadvantage of such solutions is on the one hand an unpleasant smell, on the other hand an expensive manufacturing procedure. EP-A-0091601 describes a dampening solution which contains water-miscible or water-soluble polymers instead of the isopropanol also used, cellulose ethers, polyacrylamides, polyvinyl alcohols or chemically modified rubber products being used in particular. US-A-4186250 describes mixtures of polyacrylamides with polycarboxylic acids or their alkali metal salts. Such solutions have the same shortcomings as have already been described for the polymers.

In der US-A-4374036 wird eine Befeuchtungslösung beschrieben, die Polyphosphate, wasserlösliche Polyethylenglykole, Carboxymethylcellulose, nichtionische oder anionische Tenside vom Typ Alkylorthophosphat und Alkylpolyphosphat sowie ein Polysiloxan enthalten.US-A-4374036 describes a dampening solution which contains polyphosphates, water-soluble polyethylene glycols, carboxymethyl cellulose, nonionic or anionic surfactants of the alkyl orthophosphate and alkyl polyphosphate type and a polysiloxane.

Nachteilig ist die nicht ausreichende Hydrolysestabilität von Polyphosphaten, so daß hier im Neutralbereich gearbeitet werden muß, obwohl sich in der Praxis pH-Werte um 5 als besser erwiesen haben.A disadvantage is the inadequate hydrolysis stability of polyphosphates, so that work must be carried out in the neutral range, although in practice pH values around 5 have proven to be better.

Auch Befeuchtungslösungen für den Offsetdruck, die Aminomethylenphosphonsäure und/oder deren Derivate enthalten, waren bereits vorgeschlagen worden.Moisturizing solutions for offset printing, which contain aminomethylenephosphonic acid and / or their derivatives, have already been proposed.

Es stellt sich somit die Aufgabe, eine Befeuchtungslösung für den Offsetdruck zu entwickeln, die das Tonen während des Druckprozesses sowie durch eingeschleppte Kationen verursachte Störungen verhindert, korrosionshemmend wirkt, in pH-Bereichen verwendbar ist, die für den Druckvorgang optimal sind, die unkompliziert herzustellen und kostengünstig zusammengesetzt ist.It is therefore the task to develop a dampening solution for offset printing, which prevents toning during the printing process and disturbances caused by introduced cations, has a corrosion-inhibiting effect, can be used in pH ranges which are optimal for the printing process, which are easy to manufacture and is composed inexpensively.

Diese Aufgabe wird durch eine Befeuchtungslösung gelöst, die [2-(Trihydroxysilyl)ethyl]-phosphonsäure oder deren Derivate, wie z.B. deren Salze oder Kondensate enthält.This problem is solved by a dampening solution, the [2- (trihydroxysilyl) ethyl] -phosphonic acid or its derivatives, e.g. contains their salts or condensates.

Gegenstand der vorliegenden Erfindung ist eine wäßrige Befeuchtungslösung für den Offsetdruckprozeß, die dadurch gekennzeichnet ist, daß die Lösung ein Hydrolysat einer Verbindung der allgemeinen Formel (I)

Figure imgb0001

worin R¹ und R² untereinander gleich oder verschieden sind und für Wasserstoff, einen Alkylrest mit 1 bis 9 Kohlenstoffatomen oder einen Arylrest mit 6 bis 12 Kohlenstoffatomen stehen, oder Kondensate dieses Hydrolysates enthält.The present invention relates to an aqueous dampening solution for the offset printing process, which is characterized in that the solution is a hydrolyzate of a compound of the general formula (I)
Figure imgb0001
wherein R¹ and R² are the same or different from each other and represent hydrogen, an alkyl radical with 1 to 9 carbon atoms or an aryl radical with 6 to 12 carbon atoms, or contains condensates of this hydrolyzate.

Bevorzugt sind solche Befeuchtungslösungen die ein Hydrolysat einer Verbindung der allgemeinen Formel (I) enthalten, worin R¹ und R² für Wasserstoff stehen.Preference is given to moistening solutions which contain a hydrolyzate of a compound of the general formula (I) in which R 1 and R 2 are hydrogen.

Die Verbindungen der allgemeinen Formel (I) können auch zumindest teilweise in Form ihrer Salze vorliegen, zusätzlich ein Puffersystem, ein Biocid, einen Korrosionsinhibitor, Glykol und/oder Alkohol enthalten.The compounds of the general formula (I) can also be present, at least in part, in the form of their salts, and additionally contain a buffer system, a biocide, a corrosion inhibitor, glycol and / or alcohol.

Die Befeuchtungslösung kann in Form eines Konzentrats vorliegen, wobei im Konzentrat 0,01 bis 100 g/l der Verbindung der allgemeinen Formel (I) enthalten sein kann.The dampening solution can be in the form of a concentrate, which may contain 0.01 to 100 g / l of the compound of the general formula (I).

Der pH-Wert der Befeuchtungslösung liegt zweckmäßigerweise im Bereich zwischen 3,0 und 7,0, vorzugsweise zwischen 4,0 und 5,5.The pH of the dampening solution is expediently in the range between 3.0 and 7.0, preferably between 4.0 and 5.5.

Durch den Einsatz der erfindungsgemäßen Befeuchtungslösung erneuert sich während des Offsetdruckprozesses die Hydrophilierung der Nichtbildstellen der Druckplatte, wodurch bis zum Ende des Druckvorganges ein Tonen verhindert wird. Ein besonderer Vorteil der erfindungsgemäßen Befeuchtungslösung ist, daß Störungen durch hartes Wasser oder eingeschleppte Kationen verhindert werden. Ein weiterer wesentlicher Vorteil der erfindungsgemäßen Befeuchtungslösung besteht darin, daß die Verbindung der allgemeinen Formel (I), insbesondere die [2-(Trihydroxysilyl)ethyl]phosphonsäure und deren Salze leicht aus preiswerten Rohstoffen zugänglich und in gleichbleibender Qualität herstellbar sind und auch in höheren Konzentrationen verwendet werden können.By using the dampening solution according to the invention, the hydrophilization of the non-image areas of the printing plate is renewed during the offset printing process, whereby toning is prevented until the end of the printing process. A particular advantage of the moistening solution according to the invention is that disturbances caused by hard water or cations which have been introduced are prevented. Another important advantage of the dampening solution according to the invention is that the compound of the general formula (I), in particular [2- (trihydroxysilyl) ethyl] phosphonic acid and its salts, are easily accessible from inexpensive raw materials and can be prepared in a constant quality and also in higher concentrations can be used.

Silane der allgemeinen Formel (I), wie z.B. [2-(Trialkoxysilyl)ethyl]phosphonsäuredimethylester oder [2-(Trialkoxysilyl)ethyl]phosphonsäurediethylester wie z.B. der [2-(Trimethoxysilyl)ethyl]phosphonsäuredimethylester bzw. -diethylester können auf übliche Weise, z.B. wie in US-PS 3780127 bzw. US-PS 3816550 beschrieben, in konz. Salzsäure hydrolysiert werden. Nach Entfernen überschüssiger Salzsäure kann das so erhaltene Produkt mit Wasser verdünnt werden. In gewissem Umfang können bei der Hydrolyse auch Kondensate entstehen. Sowohl Hydrolysate als auch Kondensate als auch Gemische von Hydrolysaten und Kondensaten der Verbindungen der allgemeinen Formel (I) sind erfindungsgemäß für die Befeuchtungslösung verwendbar, solange gewährleistet ist, daß die Hydrolysate bzw. deren Kondensate in wäßriger oder alkoholisch/wäßriger Lösung vollständig gelöst bzw. homogen verteilt sind.Silanes of the general formula (I), e.g. [2- (trialkoxysilyl) ethyl] phosphonic acid dimethyl ester or [2- (trialkoxysilyl) ethyl] phosphonic acid diethyl ester such as e.g. the [2- (trimethoxysilyl) ethyl] phosphonic acid dimethyl ester or diethyl ester can be prepared in a conventional manner, e.g. as described in US-PS 3780127 and US-PS 3816550, in conc. Hydrochloric acid can be hydrolyzed. After removing excess hydrochloric acid, the product obtained in this way can be diluted with water. To a certain extent, condensates can also form during hydrolysis. Both hydrolyzates and condensates as well as mixtures of hydrolyzates and condensates of the compounds of general formula (I) can be used according to the invention for the dampening solution, as long as it is ensured that the hydrolyzates or their condensates are completely dissolved or homogeneous in aqueous or alcoholic / aqueous solution are distributed.

Als Salze der Hydrolysate kommen deren Alkali- und Erdalkalisalze, insbesondere deren Na⁺-, K⁺- und NH₄⁺-Salze in Frage.Suitable salts of the hydrolysates are their alkali and alkaline earth salts, in particular their Na⁺, K⁺ and NH₄⁺ salts.

Die Hydrolysate und/oder deren Kondensate bzw. deren Salze sind in der erfindungsgemäßen Befeuchtungslösung im allgemeinen in Mengen von 0,01 bis 10, vorzugsweise 0,1 bis 2 Gew.%, bezogen auf die Gesamtmenge der Befeuchtungslösung enthalten.The hydrolyzates and / or their condensates or their salts are generally present in the dampening solution according to the invention in amounts of 0.01 to 10, preferably 0.1 to 2% by weight, based on the total amount of the dampening solution.

Der pH-Wert der Befeuchtungslösung wird zweckmäßigerweise auf einen pH-Wert zwischen 3 und 7, vorzugsweise zwischen 4 und 5,5 eingestellt.The pH of the dampening solution is expediently adjusted to a pH between 3 and 7, preferably between 4 and 5.5.

Zur Erzielung besonderer Effekte kann es auch vorteilhaft sein, der Befeuchtungslösung in bekannter Weise weitere Stoffe, wie z.B. ein Puffersystem, Biocide, Netzmittel, Entschäumer, Korrosionsinhibitoren, Verdickungsmittel, Alkohole und/oder Glykole zuzufügen.To achieve special effects, it can also be advantageous to add further substances, such as a buffer system, biocides, wetting agents, defoamers, corrosion inhibitors, thickeners, alcohols and / or glycols, to the dampening solution in a known manner.

Die erfindungsgemäße Befeuchtungslösung kann auch in Form eines Konzentrats, das bis zu 100 g/l an Hydrolysat einer Verbindung der allgemeinen Formel (I), dessen Kondensat oder Salze, sowie gegebenenfalls die oben angeführten Zusatzstoffe enthält, aufbewahrt werden.The dampening solution according to the invention can also be stored in the form of a concentrate which contains up to 100 g / l of hydrolyzate of a compound of the general formula (I), its condensate or salts, and, if appropriate, the additives mentioned above.

Mit der erfindungsgemäßen Befeuchtungslösung ist es möglich, die Hydrophilie und damit die wasserführenden Eigenschaften der Nichtbildbereiche während des Druckvorgangs aufrecht zu erhalten, ohne daß klebrige Ablagerungen und dadurch hervorgerufene Störungen wie beispielsweise bei Verwendung hochmolekularer Verbindungen auftreten.With the dampening solution according to the invention, it is possible to maintain the hydrophilicity and thus the water-carrying properties of the non-image areas during the printing process, without sticky deposits and disturbances caused thereby, for example when using high-molecular compounds.

Der weiteren Verdeutlichung der Erfindung dienen die folgenden Beispiele.The following examples serve to further illustrate the invention.

Die in den Beispielen angegebenen Teile und Prozente beziehen sich, sofern nicht anders angegeben, auf das Gewicht.The parts and percentages given in the examples relate to the weight, unless stated otherwise.

Prüfung der Wirksamkeit der Befeuchtungslösung:Checking the effectiveness of the dampening solution:

Eine elektrolytisch aufgerauhte und anodisch oxidierte Aluminiumplatte wird in die zu prüfende Befeuchtungslösung getaucht und anschließend getrocknet. Dann wird die gesamte Platte in einem Probedruckgerät mit Offsetfarbe bedruckt. Nachdem die Farbe etwas eingetrocknet ist, wird die Platte abermals in die Befeuchtungslösung gelegt und die Zeit bestimmt, in der sich die Druckfarbe wieder von der Platte ablöst. Je schneller dies geschieht, desto besser wirkt das Befeuchtungsmittel.An electrolytically roughened and anodized aluminum plate is immersed in the dampening solution to be tested and then dried. The entire plate is then printed with offset ink in a sample printing device. After the ink has dried somewhat, the plate is again placed in the dampening solution and the time taken for the printing ink to detach from the plate. The faster this happens, the better the humectant works.

Beispiel 1example 1

Eine elektrolytisch aufgerauhte und anodisch oxidierte Aluminiumplatte wurde in eine wäßrige Lösung getaucht, deren pH-Wert mittels Na₃PO₄ auf einen Wert von 5,0 eingestellt wurde und die 0,5% [2-(Trihydroxysilyl)ethyl]phosphonsäure enthielt. Zur Prüfung der Wirksamkeit wurde anschließend wie oben beschrieben verfahren. Die Farbe löste sich in der Befeuchtungslösung sehr rasch von der Platte.An electrolytically roughened and anodized aluminum plate was immersed in an aqueous solution, the pH of which was adjusted to 5.0 by means of Na₃PO₄ and which contained 0.5% [2- (trihydroxysilyl) ethyl] phosphonic acid. The test was then carried out as described above for effectiveness. The paint quickly came off the plate in the dampening solution.

Vergleichsbeispiel 1Comparative Example 1

Eine elektrolytisch aufgerauhte und anodisch oxidierte Aluminiumplatte wurde ohne weitere Behandlung mit Offsetfarbe bedruckt. Nachdem die Farbe leicht eingetrocknet war, wurde die Platte in destilliertes Wasser gelegt. Die Farbe löste sich auch nach mehreren Stunden nicht ab.An electrolytically roughened and anodized aluminum plate was printed with offset ink without further treatment. After the paint had dried slightly, the plate was placed in distilled water. The color did not come off even after several hours.

Beispiel 2Example 2

Eine elektrolytisch aufgerauhte und anodisch oxidierte Aluminiumplatte wurde in eine Lösung getaucht, die 0,5% Glycerin und 0,5% [2-(Trihydroxysilyl)ethyl]phosphonsäure enthielt. Nach der oben geschilderten Weiterverarbeitung zeigte sich, daß sich die Farbe sehr rasch wieder ablöst. Beim Druckversuch auf einer handelsüblichen Offsetdruckmaschine erhält man entsprechend vorteilhafte Ergebnisse, d.h. schnellerer Freilauf der Platte beim Anlaufen der Druckmaschine und deutlich verringerte Makulatur.An electrolytically roughened and anodized aluminum plate was immersed in a solution containing 0.5% glycerol and 0.5% [2- (trihydroxysilyl) ethyl] phosphonic acid. After the further processing described above, it was found that the paint peels off very quickly. When printing on a commercially available offset printing machine, correspondingly advantageous results are obtained, i.e. faster free-running of the plate when the printing machine starts and significantly reduced waste.

Vergleichsbeispiel 2Comparative Example 2

Der im Beispiel 2 beschriebene Versuch wurde wiederholt mit der Änderung, daß der Lösung diesmal keine [2-(Trihydroxysilyl)ethyl]phosphonsäure zugesetzt wurde. Die Farbe löste sich erst nach mehreren Stunden von der Platte.The experiment described in Example 2 was repeated with the change that this time no [2- (trihydroxysilyl) ethyl] phosphonic acid was added to the solution. The color only came off the plate after several hours.

Claims (8)

1. An aqueous damping solution for the offset printing process, wherein the solution contains a hydrolysis product of a compound of the formula (I)
Figure imgb0003
 where R¹ and R² are identical or different and are each hydrogen, alkyl of 1 to 9 carbon atoms or aryl of 6 to 12 carbon atoms, or a condensate of this hydrolysis product.
2. A damping solution as claimed in claim 1, which contains a hydrolysis product of a compound of the formula (I), where R¹ and R² are each hydrogen.
3. A damping solution as claimed in claim 1 or 2, wherein the compound of the formula (I) is partially or completely in the form of its salt.
4. A damping solution as claimed in any of the preceding claims, which additionally contains a buffer system.
5. A damping solution as claimed in any of the preceding claims, which additionally contains one or more substances from the group consisting of a biocide, a corrosion inhibitor, a glycol and an alcohol.
6. A damping solution as claimed in any of the preceding claims, which is in the form of a concentrate.
7. A damping solution as claimed in claim 6, wherein the concentrate contains from 0.01 to 100 g/l of a compound of the formula (I) as claimed in claim 2.
8. A damping solution as claimed in any of the preceding claims, which has a pH of from 3.0 to 7.0, preferably from 4.0 to 5. 5.
EP88120958A 1987-12-24 1988-12-15 Damping solution for offset printing Expired - Lifetime EP0322658B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3744121 1987-12-24
DE19873744121 DE3744121A1 (en) 1987-12-24 1987-12-24 HUMIDIFICATION SOLUTION FOR OFFSET PRINTING

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EP0322658A1 EP0322658A1 (en) 1989-07-05
EP0322658B1 true EP0322658B1 (en) 1991-08-07

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JP2673586B2 (en) * 1989-08-02 1997-11-05 富士写真フイルム株式会社 Damping water composition for lithographic printing plate, concentrated liquid used therefor and lithographic printing method using the same
DE19500253A1 (en) * 1995-01-05 1996-07-11 Wacker Chemie Gmbh Organosilicon compounds containing phosphorus
JP2005178238A (en) * 2003-12-22 2005-07-07 Konica Minolta Medical & Graphic Inc Printing method and printing plate material employing therein
JP5927746B2 (en) * 2012-06-29 2016-06-01 日油株式会社 Wetting agent for lithographic printing plates

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CA592213A (en) * 1960-02-09 G. Linville Robert Organophosphorus-silicon compositions
NL273144A (en) * 1961-01-13
LU55826A1 (en) * 1967-04-19 1969-11-13
US4084951A (en) * 1971-05-03 1978-04-18 Ciba-Geigy Ag Silicon compounds containing nucleofugal phosphate group and method of regulating plant growth therewith
US3816550A (en) * 1972-10-02 1974-06-11 Union Carbide Corp Catalytic process for hydration of olefins
US3780127A (en) * 1972-10-02 1973-12-18 Union Carbide Corp Catalytic process for dehydration of alcohols
NL7606078A (en) * 1975-06-12 1976-12-14 Dow Chemical Co PROCEDURE FOR PREPARING A WETTING SOLUTION FOR LITHOGRAPHIC PRESSURES.
US4374036A (en) * 1980-04-16 1983-02-15 Michael A. Canale Composition and concentrate useful for making a fountain solution for lithographic printing operations
CA1228204A (en) * 1982-03-29 1987-10-20 Richard J. Burns Fountain solution
DE3538703A1 (en) * 1985-10-31 1987-05-07 Hoechst Ag HUMIDIFICATION SOLUTION FOR OFFSET PRINTING
US4772408A (en) * 1987-05-06 1988-09-20 First Brands Corporation Silicate-containing antifreeze with phosphonate silane stabilizer

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EP0322658A1 (en) 1989-07-05
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US4970138A (en) 1990-11-13
DE3744121A1 (en) 1989-07-06
DE3864134D1 (en) 1991-09-12
ES2023482B3 (en) 1992-01-16

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