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EP0112745A1 - Fountain solution composition for lithographic plates - Google Patents

Fountain solution composition for lithographic plates Download PDF

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Publication number
EP0112745A1
EP0112745A1 EP83402270A EP83402270A EP0112745A1 EP 0112745 A1 EP0112745 A1 EP 0112745A1 EP 83402270 A EP83402270 A EP 83402270A EP 83402270 A EP83402270 A EP 83402270A EP 0112745 A1 EP0112745 A1 EP 0112745A1
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EP
European Patent Office
Prior art keywords
acid
water
preparations
surface tension
aqueous solutions
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Application number
EP83402270A
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German (de)
French (fr)
Inventor
Bernard Thiebaut
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.)
Inmont Sa SA
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Inmont Sa SA
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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 liquid compositions which can be used for constituting the wetting water of offset plates; it also relates to the wetting waters obtained using the compositions according to the invention.
  • offset plates have, on their surface, aquaphile parts and encrophilic parts.
  • the aquaphile parts When these plates are brought into contact with water or solutions containing water and with ink, the aquaphile parts are covered with a thin film of water and the ink-absorbing parts are covered with a film ink. These films of water and ink are then, via a rubber roller called “blanket”, transferred to the paper which is thus "printed"
  • aqueous product As an aqueous product which can be used to produce these water films, water or a mixture of water and at least one alcohol (isopropyl alcohol) is most often used. It is also known that this aqueous product may contain certain additives such as, for example, glycerin and / or sodium phosphates and / or bactericides which prevent any development of algae.
  • the aqueous product to be used should advantageously have very specific characteristics so as to, on the one hand, maintain improved stability despite the possible transfer of products from the paper and / or the plate. offset and, on the other hand, to carry out a control as precise as possible of the thickness of said film of water and therefore of the water-ink balance during transfer to the paper.
  • an appropriate surface tension depends. the dampening system used on the printing machine.
  • said surface tension will preferably be chosen between 44 and 52 10 -3 N / m.
  • said surface tension will preferably be between 32 and 37 10 - 3 N / m, it being understood that, by means of a suitable choice of the solution used for wetting, the quantity of d alcohol as usually used. If necessary, an adjustment of the surface tension of the aqueous solutions can be obtained by adding an appropriate additive (such as a non-foaming surfactant known to specialists).
  • the desired buffer effect should be as effective as possible; certain preferred preparations of the invention make it possible, for the same test, to obtain variations in pH of less than 0.5 unit.
  • the preparations used can consist either, preferably, of a single product, or of a mixture of products.
  • a single product it has been found that said product must be a salt (previously formed or formed within the solution) of an organic carboxylic acid with an organic base (amine).
  • an organic acid with an acid constant (expressed in pKa) between 3 and 6 will be used.
  • the monoacids have proved to be of little interest; polyacids will therefore be used which may have complementary functional groups, for example hydroxyl groups, as organic base, mono or polyamines (primary, secondary or tertiary amines or polyamines, such as hydrazine or ethylenediamine or amines cy cliques, or amino alcohols); these.
  • amines will have a Basicity constant (pKb) between 2 and 9 and more particularly between 3 and 6.
  • pKb Basicity constant
  • the acid salt of citric acid and dimethylamine mention will be made in particular of the acid salt of citric acid and dimethylamine.
  • This preparation can be marketed in any form; however, it will preferably be marketed in the form of an additive for fountain water which will be directly usable by the printer.
  • This additive will comprise, in the form of an aqueous solution, in addition to the preparation described above, a hygroscopic product and optionally at least one light alcohol which will serve to compatibilize the various ingredients of said additive:
  • the hygroscopic product which may either be glycerin , either an equivalent polyol such as a polysaccharide or one of its derivatives (for example carboxymethylcellulose) or a polymerization product of vinylpyrrolidone, or a colloidal silicic acid, serves to maintain the quantity of water deposited on the plate and the blanket given in particular that, due to the relatively low surface tension of the solutions used, the film of water on the plate and the blanket is particularly thin. Another important technical consequence of this minimal need for water is that the drying of the prints is accelerated.
  • the additive for wetting water may also include various products such as bactericides, fungicides or products used for self-cleaning of the blanket with respect to the ink such as, for example, N-methylpyrrolidone.
  • This additive for fountain water will be in the form of an aqueous solution and will have a concentration of active products (preparation, hygroscopic product, surfactant, etc.) such as generally from 1 to 10% of this additive is used in l dampening water.
  • the salt obtained by condensation of 1 mole of citric acid (in its monohydrate form) with 2 moles of dimethylamine was used as a buffer preparation.
  • the salt obtained by condensation of 1 mole of citric acid monohydrate with 2 moles is used as a buffer preparation. ethanolamine.
  • the salt obtained by condensation of 1 mole of malic acid per 1.1 mole of dimethylamine was used as a buffer preparation.
  • the salt obtained by condensation of 1 mole of citric acid monohydrate per 2 moles of cyclohexylamine was used as a buffer preparation.
  • the salt obtained by condensation of one mole of adipic acid with one mole of piperidine was used as a buffer preparation.
  • composition A or of composition B depends on the experimental conditions, in particular on the hardness of the water.
  • the additives described above are sold so as to be used in an amount of 1 to 6 parts by weight of this additive (per 100 parts of water).
  • additives are advantageously used after adding a suitable amount of water, namely, for example, 4 parts of additives per 100 parts of water.

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  • Printing Plates And Materials Therefor (AREA)
  • Detergent Compositions (AREA)

Abstract

Lithographic fountain solution concentrates which are combined with water to form improved fountain solutions. The concentrates contain specific quantities of buffer salts resulting in improved printing process characteristics. The buffer salts are the salts of polycarboxylic acids and organic bases such as amines. The use of alcohol in the fountain solutions is eliminated or substantially reduced.

Description

La présente invention concerne des compositions liquides utilisables pour la constitution de l'eau de mouillage des plaques offset ; elle concerne également les eaux de mouillage obtenues en utilisant les compositions selon l'invention.The present invention relates to liquid compositions which can be used for constituting the wetting water of offset plates; it also relates to the wetting waters obtained using the compositions according to the invention.

On sait que les plaques offset comportent, sur leur surface, des parties aquaphiles et des parties encrophiles. Lorsque ces plaques sont mises en contact avec de l'eau ou des solutions contenant de l'eau et avec de l'encre, les parties aquaphiles se recouvrent d'un mince film d'eau et les parties encrophiles se recouvrent d'un film d'encre. Ces films d'eau et d'encre sont ensuite, par l'intermédiaire d'un rouleau de caoutchouc dit "blanchet", transférés sur le papier qui est ainsi "imprimé"It is known that offset plates have, on their surface, aquaphile parts and encrophilic parts. When these plates are brought into contact with water or solutions containing water and with ink, the aquaphile parts are covered with a thin film of water and the ink-absorbing parts are covered with a film ink. These films of water and ink are then, via a rubber roller called "blanket", transferred to the paper which is thus "printed"

Comme produit aqueux utilisable pour réaliser ces films d'eau, on emploie le plus souvent de l'eau ou un mélange d'eau et d'au moins un alcool (alcool isopropylique). Il est également connu que ce produit aqueux peut comporter certains additifs comme par exemple de la glycérine et/ou des phosphates sodiques et/ou des bactéricides qui empêchent tout développement des algues.As an aqueous product which can be used to produce these water films, water or a mixture of water and at least one alcohol (isopropyl alcohol) is most often used. It is also known that this aqueous product may contain certain additives such as, for example, glycerin and / or sodium phosphates and / or bactericides which prevent any development of algae.

En fait, il a été trouvé que le produit aqueux à utiliser devait avantageusement avoir des caractéristiques très spécifiques de façon, d'une part, à conserver une stabilité améliorée malgré l'éventuel transfert de produits en provenance du papier et/ou de la plaque offset et, d'autre part, à réaliser un contrôle aussi précis que possible de l'épaisseur dudit film d'eau et donc de l'équilibre eau-encre lors du transfert sur le papier.In fact, it has been found that the aqueous product to be used should advantageously have very specific characteristics so as to, on the one hand, maintain improved stability despite the possible transfer of products from the paper and / or the plate. offset and, on the other hand, to carry out a control as precise as possible of the thickness of said film of water and therefore of the water-ink balance during transfer to the paper.

Selon l'invention, on utilise dans les solutions aqueuses employées pour mouiller les parties aquaphiles des plaques offset une préparation formant tampon, caractérisée.en ce que les solutions aqueuses contenant de 0,1 à 0,6 % environ en poids de ladite composition présentent les caractéristiques suivantes :

  • - avoir un pH compris entre 4,7 et 5,3
  • - présenter un pouvoir tampon suffisant pour que la variation du pH desdites solutions aqueuses soit inférieure à l'unité de pH si on ajoute auxdites solutions soit un acide fort, soit une base forte, selon le test défini ci-après.
  • - avoir une tension superficielle comprise entre 32 et 52 10 -3 N/m.
According to the invention, a buffer preparation is used in the aqueous solutions used to wet the aquaphile parts of the offset plates, characterized in that the aqueous solutions containing from 0.1 to 0.6% by weight approximately of said composition have the following features:
  • - have a pH between 4.7 and 5.3
  • - Have sufficient buffering capacity so that the pH variation of said aqueous solutions is less than the pH unit if either strong acid or a strong base is added to said solutions, according to the test defined below.
  • - have a surface tension between 32 and 52 10 -3 N / m.

Le choix d'une tension superficielle appropriée dépend. du système de mouillage utilisé sur la machine d'impression. Pour les mouillages considérés comme classiques (à base d'eau) ladite tension superficielle sera choisie de préférence entre 44 et 52 10-3 N/m. Pour les mouillages à base d'alcool, ladite tension superficielle sera de préférence entre 32 et 37 10- 3N/m, étant entendu que grâce à un choix convenable de la solution utilisée pour le mouillage, on pourra alors diminuer considérablement la quantité d'alcool telle qu'habituellement utilisée. Si nécessaire, un ajustement de la tension superficielle des solutions aqueuses pourra être obtenu par l'adjonction d'un additif approprié (tel qu' un agent tensioactif non moussant connu par les spécialistes).The choice of an appropriate surface tension depends. the dampening system used on the printing machine. For moorings considered to be conventional (water-based), said surface tension will preferably be chosen between 44 and 52 10 -3 N / m. For alcohol-based moorings, said surface tension will preferably be between 32 and 37 10 - 3 N / m, it being understood that, by means of a suitable choice of the solution used for wetting, the quantity of d alcohol as usually used. If necessary, an adjustment of the surface tension of the aqueous solutions can be obtained by adding an appropriate additive (such as a non-foaming surfactant known to specialists).

L'effet tampon recherché devra être aussi efficace que possible ; certaines préparations préférées de l'invention permettent, pour le même test, d'obtenir des variations de pH inférieures à 0,5 unité.The desired buffer effect should be as effective as possible; certain preferred preparations of the invention make it possible, for the same test, to obtain variations in pH of less than 0.5 unit.

Le test servant à définir le pouvoir tampon des préparations utilisées est le suivant :

  • - à un volume de '100 cm3 de solution, on ajoute 5 cm3 de solution décinormale soit de soude, soit d'acide chlorhydrique et on mesure le pH avant et après cette addition.
The test used to define the buffering capacity of the preparations used is as follows:
  • - To a volume of 100 cm 3 of solution, 5 cm 3 of decinormal solution is added, either of sodium hydroxide or of hydrochloric acid and the pH is measured before and after this addition.

Les préparations utilisées peuvent être constituées soit, de préférence, d'un produit unique, soit d'un mélange de produits. Dans le cas où l'on utilise un produit unique, il a été trouvé que ledit produit doit être un sel (préalablement formé ou formé au sein de la solution) d'un acide carboxylique organique avec une base organique (amine). Comme acide carboxylique, on utilisera un acide organique ayant une constante d'acidité (exprimée en pKa) située entre 3 à 6. En fait, les monoacides se sont révélés peu intéressants ; on utilisera donc des polyacides qui peuvent présenter des groupements fonctionnels complémentaires, par exemple des groupes hydroxyles, Comme base organique, on utilisera des mono ou polyamines (amines primaires, secondaires ou tertiaires ou des polyamines, telles que l'hydrazine ou l'éthylènediamine ou amines cycliques, ou des aminoalcools) ; ces. amines auront une constante de Basicité (pKb) située entre 2 et 9 et plus particulièrement entre 3 et 6. Comme produit unique utilisable, on mentionnera en particulier le sel acide d'acide citrique et diméthylamine.The preparations used can consist either, preferably, of a single product, or of a mixture of products. In the case where a single product is used, it has been found that said product must be a salt (previously formed or formed within the solution) of an organic carboxylic acid with an organic base (amine). As the carboxylic acid, an organic acid with an acid constant (expressed in pKa) between 3 and 6 will be used. In fact, the monoacids have proved to be of little interest; polyacids will therefore be used which may have complementary functional groups, for example hydroxyl groups, as organic base, mono or polyamines (primary, secondary or tertiary amines or polyamines, such as hydrazine or ethylenediamine or amines cy cliques, or amino alcohols); these. amines will have a Basicity constant (pKb) between 2 and 9 and more particularly between 3 and 6. As the only usable product, mention will be made in particular of the acid salt of citric acid and dimethylamine.

Il est connu des spécialistes que les polyacides présentent des Pka différents suivant les diverses fonctions acides qui seront successivement neutralisées lors de l'adjonction de la base. On choisira selon l'invention,de neutraliser, pour un polyacide donné, toutes les fonctions acides dont le Pka est inférieur à celui situé dans la zone prescrite de façon à obtenir un Ph convenable, tout en laissant libre la ou les autres fonctions acides qui joueront un rôle dans le pouvoir tampon du produit obtenu.It is known to specialists that polyacids have different P ka according to the various acid functions which will be successively neutralized during the addition of the base. We will choose according to the invention to neutralize, for a given polyacid, all the acid functions whose Pka is lower than that located in the prescribed zone so as to obtain a suitable Ph, while leaving free the other acid function (s) which will play a role in the buffering capacity of the product obtained.

Cette préparation pourra être commercialisée sous une forme quelconque ; cependant, elle sera de préférence commercialisée sous la forme d'un additif pour eau de mouillage qui sera directement utilisable par l'imprimeur. Cet additif comprendra, sous forme d'une solution aqueuse, outre la préparation décrite ci-dessus un produit hygroscopique et éventuellement au moins un alcool léger qui Servira à compatibiliser les divers ingrédients dudit additif: Le produit hygroscopique qui peut être, soit de la glycérine, soit un polyol équivalent tel qu'un polysaccharide ou un de ses dérivés (par exemple carboxyméthylcellulose) soit un produit de polymérisation de la vinylpyrrolidone, soit un acide silicique col- loidal, sert à maintenir la quantité d'eau déposée sur la plaque et le blanchet compte tenu notamment que, du fait de la tension superficielle relativement faible des solutions utilisées, le film d'eau sur la plaque et le blanchet est particulièrement mince. Une autre conséquence technique importante de ce besoin minimal en eau est que le séchage des impressions se trouve accéléré.This preparation can be marketed in any form; however, it will preferably be marketed in the form of an additive for fountain water which will be directly usable by the printer. This additive will comprise, in the form of an aqueous solution, in addition to the preparation described above, a hygroscopic product and optionally at least one light alcohol which will serve to compatibilize the various ingredients of said additive: The hygroscopic product which may either be glycerin , either an equivalent polyol such as a polysaccharide or one of its derivatives (for example carboxymethylcellulose) or a polymerization product of vinylpyrrolidone, or a colloidal silicic acid, serves to maintain the quantity of water deposited on the plate and the blanket given in particular that, due to the relatively low surface tension of the solutions used, the film of water on the plate and the blanket is particularly thin. Another important technical consequence of this minimal need for water is that the drying of the prints is accelerated.

Une conséquence importante de l'invention et notamment du fait que le film d'eau sur la plaque et le blanchet est très mince est qu'il est très souvent inutile d'utiliser de l'alcool avec l'eau de mouillage. Certes, l'additif pour eau de mouillage tel que décrit ci-dessus contiendra de petites quantités d'alcool, mais ces quantités sont seulement de l'ordre du pourcent dans l'eau de mouillage alors que, très souvent, on utilise dans la technique des mélanges d'eau et d'alcool pouvant comporter jusqu'à 15 % d'alcool. C'est cette utilisation massive d'alcool qui peut être supprimée en mettant en oeuvre l'invention.An important consequence of the invention and in particular the fact that the film of water on the plate and the blanket is very thin is that it is very often unnecessary to use alcohol with the wetting water. Admittedly, the fountain water additive as described above will contain small amounts of alcohol, but these amounts are only of the order of a percent in the fountain water whereas, very often, it is used in the technical mixtures of water and alcohol which may contain up to 15% alcohol. It is this massive use of alcohol that can be eliminated by implementing the invention.

L'additif pour eau de mouillage pourra comporter également divers produits tels que des bactéricides, des fongicides ou des produits servant à l' autonettoyage du blanchet vis-à-vis de l'encre comme, par exemple, de la N-méthylpyrrolidone.The additive for wetting water may also include various products such as bactericides, fungicides or products used for self-cleaning of the blanket with respect to the ink such as, for example, N-methylpyrrolidone.

Cet additif pour eau de mouillage se présentera sous forme d'une solution aqueuse et présentera une concentration en produits actifs (préparation, produit hygroscopique, surfactant ...) telle que l'on utilise généralement de 1 à 10 % de cet additif dans l'eau de mouillage.This additive for fountain water will be in the form of an aqueous solution and will have a concentration of active products (preparation, hygroscopic product, surfactant, etc.) such as generally from 1 to 10% of this additive is used in l dampening water.

Les exemples non limitatifs ci-après illustrent l'invention.The nonlimiting examples below illustrate the invention.

EXEMPLE 1EXAMPLE 1 PréparationPreparation

On a utilisé comme préparation formant tampon le sel obtenu par condensation de 1 mole d'acide citrique (sous sa forme monohydratée) avec 2 moles de diméthylamine.The salt obtained by condensation of 1 mole of citric acid (in its monohydrate form) with 2 moles of dimethylamine was used as a buffer preparation.

Le sel obtenu utilisé, à raison de 0,6 g de sel dans 100 g d'eau, donne une solution aqueuse dont les propriétés sont les suivantes :

  • - pH : 5,3
  • - pouvoir tampon
    • variation du pH par addition de 5 cm3 de soude décinormale : de 5,3 à 5,8
    • variation du pH par addition de 5 cm d'acide chlorhydrique décinormal : de 5,3 à 4,9
  • - tension superficielle environ : 47,3.10-3 N/m
The salt obtained used, at a rate of 0.6 g of salt in 100 g of water, gives an aqueous solution whose properties are as follows:
  • - pH: 5.3
  • - buffering capacity
    • variation of pH by addition of 5 cm 3 of decinormal soda: from 5.3 to 5.8
    • variation of pH by addition of 5 cm of decinormal hydrochloric acid: from 5.3 to 4.9
  • - surface tension approximately: 47.3.10 -3 N / m

Dans cet exemple, on a neutralisé sensiblement deux fonctions acides de l'acide citrique (le Pka de la deuxième fonction acide dudit acide citrique étant située entre 4,7 et 4,8),In this example, two acid functions of citric acid have been substantially neutralized (the P ka of the second acid function of said citric acid being between 4.7 and 4.8),

EXEMPLE 2EXAMPLE 2 PréparationPreparation

On utilise comme préparation formant tampon le sel obtenu par condensation de 1 mole d'acide citrique monohydraté avec 2 moles d'éthanolamine.The salt obtained by condensation of 1 mole of citric acid monohydrate with 2 moles is used as a buffer preparation. ethanolamine.

Le sel obtenu utilisé, à raison de 0,6 g de sel dans 100 g d'eau, donne une solution aqueuse dont les propriétés sont. les suivantes :

  • - pH : 5,25
  • - pouvoir tampon
    • addition de 5 cm3 de soude N/10 : 5,8
    • addition de 5 cm3 de HC 1N/10 : 4,8
  • - tension superficielle environ : 42,6.10-3 N/m
The salt obtained used, at a rate of 0.6 g of salt in 100 g of water, gives an aqueous solution whose properties are. the following :
  • - pH: 5.25
  • - buffering capacity
    • addition of 5 cm 3 of sodium hydroxide N / 10: 5.8
    • addition of 5 cm 3 of HC 1N / 10: 4.8
  • - surface tension approximately: 42.6.10 -3 N / m

EXEMPLE 3EXAMPLE 3 PréparationPreparation

On a utilisé comme préparation formant tampon le sel obtenu par condensation de 1. mole d'acide malique pour 1,1 mole de diméthylamine.The salt obtained by condensation of 1 mole of malic acid per 1.1 mole of dimethylamine was used as a buffer preparation.

Le sel obtenu utilisé, à raison de 0,6 g de sel dans 100 g d'eau, donne une solution aqueuse dont les propriétés sont les suivantes :

  • - pH : 4,3
  • - pouvoir tampon
    • addition de 5 cm3 de soude N/10 : 4,7
    • addition de 5 cm3 de HC1 N/10 : 4,1
  • - tension superficielle environ : 54,9 N/m
The salt obtained used, at a rate of 0.6 g of salt in 100 g of water, gives an aqueous solution whose properties are as follows:
  • - pH: 4.3
  • - buffering capacity
    • addition of 5 cm 3 of N / 10 soda: 4.7
    • addition of 5 cm 3 of HC1 N / 10: 4.1
  • - surface tension approximately: 54.9 N / m

Dans cet exemple, on a neutralisé un peu plus qu'une fonction acide de l'acide malique (le Pka de la première fonction acide dudit acide étant 3,4 et de la deuxième fonction acide d'environ 5,1).In this example, we neutralized a little more than an acid function of malic acid (the P ka of the first acid function of said acid being 3.4 and of the second acid function of approximately 5.1).

EXEMPLE 4EXAMPLE 4 PréparationPreparation

On a utilisé comme préparation formant tampon le sel obtenu par condensation de 1 mole d'acide citrique monohydraté pour 2 moles de cyclohexylamine.The salt obtained by condensation of 1 mole of citric acid monohydrate per 2 moles of cyclohexylamine was used as a buffer preparation.

Le sel obtenu utilisé, à raison de 0,6 g de sel dans 100g d'eau, donne une solution aqueuse dont les propriétés sont les suivantes :

  • - pH : 5,4
  • - pouvoir tampon
    • addition de 5 cm3 de soude N/10 ; 6,2
    • addition de 5 cm3 de HCl N/10 = 4,9
  • - tension superficielle environ : 50,4 N/m
The salt obtained used, at a rate of 0.6 g of salt in 100 g of water, gives an aqueous solution whose properties are as follows:
  • - pH: 5.4
  • - buffering capacity
    • addition of 5 cm 3 of N / 10 soda; 6.2
    • addition of 5 cm 3 of HCl N / 10 = 4.9
  • - surface tension approximately: 50.4 N / m

EXEMPLE 5EXAMPLE 5 PréparationPreparation

On a utilisé comme préparation formant tampon le sel obtenu par condensation d'une mole d'acide adipique avec une mole de pipéridine.The salt obtained by condensation of one mole of adipic acid with one mole of piperidine was used as a buffer preparation.

Le sel obtenu utilisé à raison de 0,6 g de sel dans 100 g d'eau donne une solution aqueuse dont les propriétés sont les suivantes :

  • - pH : 5
  • - pouvoir tampon
    • addition de 5 cm3 de soude N/10 : 5,3
    • addition de 5 cm3 de HCL N/10 : 4,7
The salt obtained, used in an amount of 0.6 g of salt in 100 g of water, gives an aqueous solution whose properties are as follows:
  • - pH: 5
  • - buffering capacity
    • addition of 5 cm 3 of sodium hydroxide N / 10: 5.3
    • addition of 5 cm 3 of HCL N / 10: 4.7

EXEMPLE 6EXAMPLE 6 PréparationPreparation

On a utilisé 1 mole d'acide adipique pour 1 mole de diméthylamine.1 mole of adipic acid was used per 1 mole of dimethylamine.

Les résultats obtenus pour la solution aqueuse sont :

  • - pH : 4,9
  • - pouvoir tampon
    • addition de 5 cm3 de soude N/10 : 5,2
    • addition de 5 cm3 de HCL N/10 : 4,7
The results obtained for the aqueous solution are:
  • - pH: 4.9
  • - buffering capacity
    • addition of 5 cm 3 of sodium hydroxide N / 10: 5.2
    • addition of 5 cm 3 of HCL N / 10: 4.7

EXEMPLE 7EXAMPLE 7 PréparationPreparation

On obtient des résultats sensiblement équivalents en utilisant les couples acides-base suivants :

  • acide glutamique (1mole) cyclohexylamine (1mole)
  • acide succinique (Imole) éthylénédiamine (0,5mole)
  • acide azélaïque (1mole) triéthylamine (1mole)
Substantially equivalent results are obtained using the following acid-base pairs:
  • glutamic acid (1 mole) cyclohexylamine (1 mole)
  • succinic acid (Imole) ethylenediamine (0.5mole)
  • azelaic acid (1 mole) triethylamine (1 mole)

EXEMPLE 8EXAMPLE 8 Additif pour eau de mouillageAdditive for dampening water

A partir des préparations des exemples 1 à 7, on a réalisé les additifs pour eau de mouillage ayant les compositions suivantes :

Figure imgb0001
eau : complément à 100 parties en poidsFrom the preparations of Examples 1 to 7, the additives for fountain water having the following compositions were produced:
Figure imgb0001
 water: complement to 100 parts by weight

Le choix dans l'utilisation, dans l'eau de mouillage, de la composition A ou de la composition B dépend des conditions expérimentales, en particulier de la dureté de l'eau.The choice in the use, in the fountain water, of composition A or of composition B depends on the experimental conditions, in particular on the hardness of the water.

Les additifs décrits ci-dessus sont commercialisés de façon à être utilisés à raison de 1 à 6 parties en poids de cet additif (pour 100 parties d'eau).The additives described above are sold so as to be used in an amount of 1 to 6 parts by weight of this additive (per 100 parts of water).

EXEMPLE 9EXAMPLE 9 Additifs pour eau de mouillageAdditives for fountain water

En suivant l'exemple 8, on a réalisé les autres préparations suivantes :

Figure imgb0002
Following example 8, the following other preparations were made:
Figure imgb0002

Ces additifs sont utilisés avantageusement après addition d'une quantité convenable d'eau, à savoir, par exemple, 4 parties d'additifs pour 100 parties d'eau.These additives are advantageously used after adding a suitable amount of water, namely, for example, 4 parts of additives per 100 parts of water.

Les avantages de l'utilisation dans l'eau de mouillage des additifs décrits sont notamment les suivants :

  • - dans toutes les machines d'impression, on limite la rupture des bandes de papier ; c'est notamment le cas dans l'imprimerie des journaux (forte tension d'un papier de faible grammage, rotation rapide),
  • - moindre adhérence du papier au blanchet,
  • - absence de délitage et défibrage du papier ; cet avantage permet notamment de supprimer, durant un service, les arrêts de machine pour nettoyage des blanchets,
  • - diminuer les risques d'émulsion de l'encre,
  • - séchage accéléré, notamment sur les papiers non absorbants,
  • - on évite que l'encre ne salisse les doigts pour les papiers journaux.
The advantages of using the additives described in wetting water are in particular the following:
  • - in all printing machines, the breaking of the paper strips is limited; this is particularly the case in newspaper printing (high tension of light weight paper, rapid rotation),
  • - less adhesion of the paper to the blanket,
  • - absence of disintegration and defibration of the paper; this advantage allows in particular to remove, during a service, machine stops for cleaning blankets,
  • - reduce the risk of ink emulsion,
  • - accelerated drying, especially on non-absorbent paper,
  • - the ink is prevented from dirtying the fingers for newsprint.

Claims (10)

1. Préparations, utilisables pour réaliser les solutions aqueuses employées pour mouiller les parties aquaphiles des plaques offset, caractérisées en ce que les solutions aqueuses contenant d'environ 0,1 à environ 0,6 % en poids desdites préparations présentent les caractéristiques suivantes : - avoir un pH compris entre 4,7 et 5,3 - présenter un pouvoir tampon suffisant pour que la variation du pH desdites solutions aqueuses soit inférieure à 1 unité pH, si l'on ajoute auxdites solutions soit un acide fort, soit une base forte selon le test défini, - avoir une tension superficielle comprise entre 32 et 52.10-3 N/m,
et que, en vue de l'obtention desdites caractéristiques, elles contiennent une quantité convenable d'un sel d'un acide carboxylique organique avec une base organique.1. Preparations usable for making the aqueous solutions used to wet the aquaphile parts of the offset plates, characterized in that the aqueous solutions containing from about 0.1 to about 0.6% by weight of the said preparations have the following characteristics: - have a pH between 4.7 and 5.3 - have sufficient buffering capacity so that the variation in p H of said aqueous solutions is less than 1 pH unit, if either a strong acid or a strong base is added according to the defined test, - have a surface tension between 32 and 52.10 -3 N / m,
and that, with a view to obtaining said characteristics, they contain a suitable amount of a salt of an organic carboxylic acid with an organic base. 2. Préparations selon la revendication 1 caractérisées en ce que lesdites solutions aqueuses ont une tension superficielle comprise entre 44 et 52.10-3 N/m.2. Preparations according to claim 1 characterized in that said aqueous solutions have a surface tension between 44 and 52.10 -3 N / m. 3. Préparations selon la revendication 1 caractérisées en ce que lesdites solutions aqueuses ont une tension superficielle comprise entre 32 et 37.10-3 N/m, ladite tension superficielle pouvant être obtenue grâce à l'addition d'un additif approprié connu.3. Preparations according to claim 1 characterized in that said aqueous solutions have a surface tension between 32 and 37.10- 3 N / m, said surface tension can be obtained by the addition of a known suitable additive. 4. Préparations selon l'une des revendications 1 à 3 caractérisées en ce que l'acide carboxylique organique est un polyacide ayant un pKa compris entre 3 et 6.4. Preparations according to one of claims 1 to 3 characterized in that the organic carboxylic acid is a polyacid having a pKa of between 3 and 6. 5. Préparations selon la revendication 4, caractérisées en ce que ledit acide organique comporte également au moins un groupe hydroxyle.5. Preparations according to claim 4, characterized in that said organic acid also comprises at least one hydroxyl group. 6. Préparations selon la revendication 1, caractérisées en ce que ladite base organique est une amine ayant un pKb compris entre 3 et 9 et de préférence entre 3 et 6.6. Preparations according to claim 1, characterized in that said organic base is an amine having a pKb of between 3 and 9 and preferably between 3 and 6. 7. Préparations selon la revendication 1 caractérisées en ce que ledit sel est le sel acide de l'acide citrique et de la diméthylamine.7. Preparations according to claim 1 characterized in that said salt is the acid salt of citric acid and dimethylamine. 8. Additifs pour eau de mouillage des plaques offset, caractérisés en ce qu'ils comportent une préparation selon l'une des revendications 1 à 7, un produit hygroscopique et au moins un alcool léger.8. Additives for wetting water of offset plates, characterized in that they comprise a preparation according to one of claims 1 to 7, a hygroscopic product and at least one light alcohol. 9. Eaux de mouillage, caractérisées en ce qu'elles contiennent de 2 à 10 % en poids d'un additif selon la revendication 8.9. Wetting waters, characterized in that they contain from 2 to 10% by weight of an additive according to claim 8. 10. Eaux de mouillage pour plaques offset selon la revendication 9, caractérisées en ce qu'elles ne comportent pas d'alcool autre que le ou les alcools contenus dans lesdits additifs.10. Wetting waters for offset plates according to claim 9, characterized in that they do not contain alcohol other than the alcohol or alcohols contained in said additives.
EP83402270A 1982-11-26 1983-11-24 Fountain solution composition for lithographic plates Withdrawn EP0112745A1 (en)

Applications Claiming Priority (2)

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FR8219911A FR2536675A1 (en) 1982-11-26 1982-11-26 COMPOSITIONS FOR WATER OFFSET PLATE WET
FR8219911 1982-11-26

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WO1995003177A1 (en) * 1993-07-21 1995-02-02 Arturo Guerini Process and device for treating washing liquid in printing presses, particularly for offset printing presses
WO1999050076A1 (en) * 1998-03-31 1999-10-07 B/M Management Cc Printing solution for lithographic printing

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US4859247A (en) * 1987-11-02 1989-08-22 Basf Corporation Low viscosity, highly concentrated pigment dispersions and method of making same
US4822419A (en) * 1987-11-09 1989-04-18 Basf Corporation Lithographic ink composition and process for making same
EP0667243A1 (en) * 1994-02-15 1995-08-16 Saito, Toshiki, c/o Toshiki Saito Design Room Offset printing method and high-density mini-prints produced by the method
JP5805149B2 (en) * 2012-07-17 2015-11-04 東京インキ株式会社 Lithographic printing method and fountain solution concentrated composition

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FR2415131A1 (en) * 1978-01-18 1979-08-17 Vickers Ltd WETTING COMPOSITION FOR LITHOGRAPHIC PRINTING
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PL91463B1 (en) * 1974-08-23 1977-02-28
FR2415131A1 (en) * 1978-01-18 1979-08-17 Vickers Ltd WETTING COMPOSITION FOR LITHOGRAPHIC PRINTING
US4291117A (en) * 1979-02-27 1981-09-22 Fuji Photo Film Co., Ltd. Plate making process with novel use of surfactant

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995003177A1 (en) * 1993-07-21 1995-02-02 Arturo Guerini Process and device for treating washing liquid in printing presses, particularly for offset printing presses
US5772859A (en) * 1993-07-21 1998-06-30 Guerini; Arturo Device for treating wetting liquid in printing presses, particularly for offset printing presses
WO1999050076A1 (en) * 1998-03-31 1999-10-07 B/M Management Cc Printing solution for lithographic printing

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MX161896A (en) 1991-02-28
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EP0126773A1 (en) 1984-12-05
DK541683A (en) 1984-05-27
AU2412284A (en) 1984-06-18
AU576748B2 (en) 1988-09-08
CA1251881A (en) 1989-03-28
JPS59502097A (en) 1984-12-20
WO1984002142A1 (en) 1984-06-07

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