EP0274017B1 - Antistatic photographic support material - Google Patents

Antistatic photographic support material Download PDF

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Publication number
EP0274017B1
EP0274017B1 EP87116068A EP87116068A EP0274017B1 EP 0274017 B1 EP0274017 B1 EP 0274017B1 EP 87116068 A EP87116068 A EP 87116068A EP 87116068 A EP87116068 A EP 87116068A EP 0274017 B1 EP0274017 B1 EP 0274017B1
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EP
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Prior art keywords
support material
material according
photographic
acid
mol
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EP87116068A
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German (de)
French (fr)
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EP0274017A3 (en
EP0274017A2 (en
Inventor
Eckehard Säverin
Hans-Udo Tyrakowski
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Felex Schoeller Jr and GmbH and Co KG
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Felex Schoeller Jr and GmbH and Co KG
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Priority to AT87116068T priority Critical patent/ATE78938T1/en
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Publication of EP0274017A3 publication Critical patent/EP0274017A3/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
    • G03C1/85—Photosensitive materials characterised by the base or auxiliary layers characterised by antistatic additives or coatings

Definitions

  • Backing materials for photographic layers are usually provided with an antistatic layer on the back in order to prevent them from becoming damaged during processing of the material, e.g. build up static charges on the surface during watering with photosensitive emulsions or after passing through the bath.
  • the discharges would lead to exposure of the photographic layer, so that undesired markings in the image become visible.
  • the static charge also causes the images to adhere to one another during sorting, so that further processing is disrupted.
  • hydrophobic components have the disadvantage of high dirt absorption and low antistatic activity, while hydrophilic components result in low adhesive tape adhesion, poor printability and inadequate bath strength.
  • EP-A-0 160 912 discloses a photographic material with a silver halide emulsion layer on one side of a polyolefin-coated paper support and an antistatic layer on the other side of the support, in which the antistatic layer contains a sodium magnesium silicate, a sodium polystyrene sulfonate and certain succinic acid half-esters .
  • the conductivity in this combination is such that the desired antistatic properties are sufficient.
  • the material also has a relative low dirt absorption.
  • the object of the present invention is to provide a photographic material of the type mentioned at the beginning, the antistatic coated back of which at the same time has good properties with regard to all of the above five requirements.
  • the antistatic layer contains a colloidal aluminum-modified silica, an alkali salt of an organic polyacid, for example sodium polystyrene sulfonate as a conductivity agent, an aqueous one Dispersion of copolymers of acrylic acid alkyl esters with a content of free carboxyl groups of 1-10 mol% and free hydroxyl groups of 0-20 mol% as a binder, and a trifunctional aziridine as a crosslinking agent.
  • an alkali salt of an organic polyacid for example sodium polystyrene sulfonate
  • an aqueous one Dispersion of copolymers of acrylic acid alkyl esters with a content of free carboxyl groups of 1-10 mol% and free hydroxyl groups of 0-20 mol% as a binder and a trifunctional aziridine as a crosslinking agent.
  • crosslinking agents for plastic dispersions containing free carboxyl groups.
  • this backside coating according to the invention shows both sufficient conductivity and thus good antistatic properties, low dirt absorption with regard to the mostly dark-colored oxidation products of developer solutions, good abrasion and water resistance when passing through acidic and alkaline development baths, good printability with commercially available printing inks and good writing properties as well as good adhesive tape adhesion even with chemical and mechanical stress.
  • the sum of the polar groups does not exceed 25 mol% of the copolymer of acrylic acid esters.
  • a terpolymer of styrene, C1-C4-alkyl acrylate and 10% methacrylic acid is provided as a binder.
  • the effectiveness of the combination of the specific binder according to the invention and the crosslinking agent is increased by sodium magnesium silicate of the montmorillonite type additionally contained in the antistatic layer.
  • the proportions of the components are based on the dry layer as follows: colloidal silica: 23-70% by weight Alkaline salt of polyacid: 3 - 30% by weight Polymer binder: 30-70% by weight Montmorillonite: 0 - 30% by weight Aziridine: 2 - 18% by weight
  • the layer application (dry) is 0.2 - 1.0 g / m2, in particular 0.2 - 0.5 g / m2.
  • the support material for photographic layers according to the invention is produced in particular by slowly mixing the individual components in the sequence water-alcohol mixture, montmorillonite, colloidals, aluminum-modified silica, copolymer dispersion, alkali salt of organic polyacid, aziridine, the desired pH - Sets the value with ammonia solution, applies the casting solution thus obtained in the desired layer thickness and then dries.
  • the antistatic properties are tested by measuring the surface resistance with an electrode according to DIN 53482.
  • samples are printed with standard color ribbons.
  • the samples were printed in a 30 sec commercial developer dipped and rinsed briefly with water. Then you apply finger friction to the printed back. It is checked whether the print is blurred or whether discoloration occurs due to the washing out of a color component of the printing ink.
  • a print smeared after developer bath and friction is either due to poor adhesion of the print on the back of the photographic material or to low abrasion resistance of the back coating. The latter, i.e. damage due to abrasion of the back surface, can be seen when viewed against the light.
  • the sample is provided with a commercially available adhesive tape (eg 3 M adhesive tape 8422) and this is fixed with a defined weight (8 kg roll). Then the pattern is cut into 1.5 cm wide strips and the adhesive tape is partially peeled off.
  • the sample prepared in this way is clamped in a breaking load tester in which the adhesive tape is removed from the base at an angle of 180 ° at a speed of 20 cm / min. The force required to pull off is measured. Since the adhesive tape adhesion must be sufficient even under mechanical stress in developing solutions, a drop of water is placed on the boundary between the photographic material and the adhesive tape before the adhesive tape is peeled off.
  • Table 1 below contains examples of compositions of mixtures for antistatic layers according to the invention. The associated test values are contained in Table 2.

Abstract

A base material for photographic layers with an antistatic back coating contains at least four components: a. a colloidal aluminium-modified silica b. an alkali metal salt of an organic polybasic acid c. an aqueous dispersion of alkyl acrylate copolymers containing 1-10 mol% of free carboxyl groups and 0-20 mol% of free hydroxyl groups d. a trifunctional aziridine as a crosslinking agent. A process for the preparation thereof is also described. <??>The antistatic back of the photographic material according to the invention shows low pick-up of soil when passing through developing machines with roll transport, high wear resistance and stability in alkaline developer solutions, good printability when printed with conventional printing inks, good lettering capacity and also good adhesion of adhesive tapes.

Description

Trägermaterialien für fotografische Schichten sind üblicherweise auf der Rückseite mit einer antistatischen Schicht versehen, um zu verhindern, daß sich während der Verarbeitung des Materials, d.h. während des Begießens mit lichtempfindlichen Emulsionen oder auch nach dem Bäderdurchgang bei Sortiervorgängen auf der Oberfläche statische Ladungen aufbauen. Die Entladungen würden zur Belichtung der fotografischen Schicht führen, so daß unerwünschte Markierungen im Bild sichtbar werden. Die statische Aufladung führt außerdem während des Sortierens zur Haftung der Bilder aneinander, so daß die weitere Verarbeitung gestört wird.Backing materials for photographic layers are usually provided with an antistatic layer on the back in order to prevent them from becoming damaged during processing of the material, e.g. build up static charges on the surface during watering with photosensitive emulsions or after passing through the bath. The discharges would lead to exposure of the photographic layer, so that undesired markings in the image become visible. The static charge also causes the images to adhere to one another during sorting, so that further processing is disrupted.

Neben den genannten antistatischen Eigenschaften soll die rückseitige Schicht des fotografischen Materials gleichzeitig folgende Anforderungen erfüllen:

  • Geringe Schmutzaufnahme beim Durchgang des fotografischen Materials durch Walzentransportentwicklungsmaschinen, bei dem sich leicht Schmutzfilme aus den Oxydationsprodukten des Entwicklers ablagern.
  • Möglichst hohe Abriebfestigkeit und Beständigkeit in alkalischen Entwicklerlösungen, die z.B. beim Durchgang des fotografischen Materials durch mit Walzen ausgerüstete Verarbeitungsmaschinen bedeutsam ist.
  • Gute Bedruckbarkeit beim Bedrucken mit herkömmlichen Druckfarben sowie gute Beschriftbarkeit.
  • Gute Klebebandhaftung, da beim Durchlauf des fotografischen Materials durch moderne Entwicklungsautomaten die jeweils nächstfolgende Rolle an die vorhergehende Rolle geklebt wird und die Klebehaftung beim Durchgang der Klebestelle durch Entwicklungsbäder gewährleistet sein muß.
In addition to the above-mentioned antistatic properties, the back layer of the photographic material should also meet the following requirements:
  • Low dirt pick-up when the photographic material passes through roller transport developing machines, in which dirt films from the developer's oxidation products are easily deposited.
  • Highest possible abrasion resistance and resistance in alkaline developer solutions, which is important, for example, when the photographic material passes through processing machines equipped with rollers.
  • Good printability when printing with conventional printing inks as well as good writing properties.
  • Good adhesive tape adhesion, since when the photographic material passes through modern development machines, the next roll in each case is glued to the previous roll and the adhesive adhesion must be guaranteed when the glue point passes through development baths.

Es ist in der Praxis sehr schwierig, diese Eigenschaften gleichzeitig zu verwirklichen, weil die dafür bekannten Komponenten die Materialeigenschaften zum Teil gegensätzlich beeinflussen. Hydrophobe Komponenten haben beispielsweise den Nachteil einer hohen Schmutzaufnahme und geringer antistatischer Wirksamkeit, während hydrophile Komponenten eine geringe Klebebandhaftung, schlechte Bedruckbarkeit und ungenügende Bäderfestigkeit ergeben.In practice, it is very difficult to achieve these properties at the same time, because the components known for this influence the material properties in part in opposite ways. For example, hydrophobic components have the disadvantage of high dirt absorption and low antistatic activity, while hydrophilic components result in low adhesive tape adhesion, poor printability and inadequate bath strength.

Es ist bekannt, daß die statische Aufladung der rückseitigen Schicht durch Mattierungsmittel vermindert werden kann, weil durch sie die Adhäsion zweier aufeinanderliegender fotografischer Materialien herabgesetzt wird. Weiter ist bekannt, daß die bereits vorhandene statische Aufladung durch elektrisch leitende Zusätze in der Schicht entfernt wird. So ist z.B. aus der EP-A-0 160 912 ein fotografisches Material mit einer Silberhalogenidemulsionsschicht auf einer Seite eines polyolefinbeschichteten Papierträgers und einer antistatischen Schicht auf der anderen Seite des Trägers bekannt, bei dem die antistatische Schicht ein Natriummagnesiumsilikat, ein Natriumpolystyrolsulfonat und bestimmte Bernsteinsäurehalbester enthält. Die Leitfähigkeit ist bei dieser Kombination so, daß die gewünschten antistatischen Eigenschaften ausreichend sind. Außerdem weist das Material auch eine relativ geringe Schmutzaufnahme auf. Dies geht jedoch einher mit Verlusten bei den anderen erforderlichen Eigenschaften. Da antistatisch wirksame Stoffe wegen der ionischen Leitfähigkeit in der Regel wasserlöslich oder zumindest wasserquellbar sind, führt eine gute Leitfähigkeit gewöhnlich zu einer schlechten Haftung der Schicht beim Durchgang durch Bäder. Eine Folge der guten Leitfähigkeit ist also eine verringerte Abriebfestigkeit sowie eine verschlechterte Klebebandhaftung.It is known that the static charge on the back layer can be reduced by matting agents because it reduces the adhesion of two photographic materials lying on top of one another. It is also known that the static charge already present is removed by electrically conductive additives in the layer. For example, EP-A-0 160 912 discloses a photographic material with a silver halide emulsion layer on one side of a polyolefin-coated paper support and an antistatic layer on the other side of the support, in which the antistatic layer contains a sodium magnesium silicate, a sodium polystyrene sulfonate and certain succinic acid half-esters . The conductivity in this combination is such that the desired antistatic properties are sufficient. In addition, the material also has a relative low dirt absorption. However, this is accompanied by losses in the other required properties. Since antistatic substances are generally water-soluble or at least water-swellable because of the ionic conductivity, good conductivity usually leads to poor adhesion of the layer when passing through baths. One consequence of the good conductivity is a reduced abrasion resistance and a deterioration of the adhesive tape adhesion.

Es ist nun grundsätzlich schwierig, ein fotografisches Material zu erhalten, das bezüglich aller der oben genannten fünf Eigenschaften den Anforderungen entspricht. Polare Oberflächen sind nämlich zwar leitfähig (antistatische Eigenschaft) und zeigen eine geringe Schmutzaufnahme, aber mit zunehmender Polarität nehmen die Abriebfestigkeit und die Klebebandhaftung durch Einwirkung der Bäder ab. Umgekehrt führte bislang eine Verbesserung der Klebebandhaftung zu Verlusten hinsichtlich der Leitfähigkeit und zu erhöhter Schmutzaufnahme des fotografischen Materials.It is now fundamentally difficult to obtain a photographic material that meets the requirements for all of the above five properties. Indeed, polar surfaces are conductive (antistatic property) and show little dirt pick-up, but with increasing polarity, the abrasion resistance and the adhesive tape decrease due to the action of the baths. Conversely, an improvement in adhesive tape adhesion has led to losses in terms of conductivity and increased dirt absorption of the photographic material.

Die Aufgabe der vorliegenden Erfindung besteht darin, ein fotografisches Material der eingangs genannten Art zu schaffen, dessen antistatisch beschichtete Rückseite gleichzeitig gute Eigenschaften hinsichtlich aller der oben genannten fünf Anforderungen aufweist.The object of the present invention is to provide a photographic material of the type mentioned at the beginning, the antistatic coated back of which at the same time has good properties with regard to all of the above five requirements.

Dazu enthält die antistatische Schicht eine kolloidale aluminiummodifizierte Kieselsäure, ein Alkalisalz einer organischen Polysäure, z.B. Natriumpolystyrolsulfonat als Leitfähigkeitsmittel, eine wässrige Dispersion von Copolymeren von Acrylsäure-Alkylestern mit einem Gehalt an freien Carboxylgruppen von 1 - 10 Mol-% und an freien Hydroxylgruppen von 0 - 20 Mol-% als Bindemittel, sowie ein trifunktionelles Aziridin als Vernetzungsmittel.For this purpose, the antistatic layer contains a colloidal aluminum-modified silica, an alkali salt of an organic polyacid, for example sodium polystyrene sulfonate as a conductivity agent, an aqueous one Dispersion of copolymers of acrylic acid alkyl esters with a content of free carboxyl groups of 1-10 mol% and free hydroxyl groups of 0-20 mol% as a binder, and a trifunctional aziridine as a crosslinking agent.

Letztere sind als Vernetzungsmittel für freie Carboxylgruppen enthaltende Kunststoffdispersionen bekannt.The latter are known as crosslinking agents for plastic dispersions containing free carboxyl groups.

Wie Vergleichsversuche gezeigt haben, zeigt dieser erfindungsgemäße Rückseitenstrich sowohl ausreichende Leitfähigkeit und somit gute antistatische Eigenschaften, geringe Schmutzaufnahme hinsichtlich der meist dunkel gefärbten Oxydationsprodukte von Entwicklerlösungen, gute Abrieb- und Wasserfestigkeit beim Durchgang durch saure und alkalische Entwicklungsbäder, gute Bedruckbarkeit mit handelsüblichen Druckfarben und gute Beschriftbarkeit sowie gute Klebebandhaftung auch bei chemischer und mechanischer Beanspruchung. Vorzugsweise überschreitet die Summe der polaren Gruppen nicht 25 Mol-% des Copolymeren von Acrylsäureestern.As comparative experiments have shown, this backside coating according to the invention shows both sufficient conductivity and thus good antistatic properties, low dirt absorption with regard to the mostly dark-colored oxidation products of developer solutions, good abrasion and water resistance when passing through acidic and alkaline development baths, good printability with commercially available printing inks and good writing properties as well as good adhesive tape adhesion even with chemical and mechanical stress. Preferably, the sum of the polar groups does not exceed 25 mol% of the copolymer of acrylic acid esters.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist als Bindemittel ein Terpolymeres aus Styrol, C₁-C₄-Alkylacrylat und 10 % Methacrylsäure vorgesehen. Gemäß einer weiteren bevorzugten Ausführungsform der Erfindung wird die Wirksamkeit der Kombination aus dem erfindungsgemäßen spezifischen Bindemittel und dem Vernetzungsmittel durch in der antistatischen Schicht zusätzlich enthaltenes Natriummagnesiumsilikat des Montmorillonittyps erhöht.According to a preferred embodiment of the invention, a terpolymer of styrene, C₁-C₄-alkyl acrylate and 10% methacrylic acid is provided as a binder. According to a further preferred embodiment of the invention, the effectiveness of the combination of the specific binder according to the invention and the crosslinking agent is increased by sodium magnesium silicate of the montmorillonite type additionally contained in the antistatic layer.

Die Mengenverhältnisse der Komponenten sind jeweils bezogen auf die trockene Schicht folgende: kolloidale Kieselsäure: 23 - 70 Gew.% Alkalisalz der Polysäure: 3 - 30 Gew.% Polymer-Binder: 30 - 70 Gew.% Montmorillonit: 0 - 30 Gew.% Aziridin: 2 - 18 Gew.% The proportions of the components are based on the dry layer as follows: colloidal silica: 23-70% by weight Alkaline salt of polyacid: 3 - 30% by weight Polymer binder: 30-70% by weight Montmorillonite: 0 - 30% by weight Aziridine: 2 - 18% by weight

Der Schichtauftrag (trocken) liegt bei 0,2 - 1,0 g/m², insbesondere 0,2 - 0,5 g/m².The layer application (dry) is 0.2 - 1.0 g / m², in particular 0.2 - 0.5 g / m².

Die Herstellung des erfindungsgemäßen Trägermaterials für fotografische Schichten erfolgt insbesondere in der Weise, daß man die Einzelkomponenten in der Reihenfolge Wasser-Alkohol-Gemisch, Montmorillonit, Kolloidale, aluminiummodifizierte Kieselsäure, Copolymerdispersion, Alkalisalz der organischen Polysäure, Aziridin langsam unter Rühren vermischt, den gewünschten pH-Wert mit Ammoniaklösung einstellt, die so erhaltene Gießlösung in der gewünschten Schichtdicke aufträgt und anschließend trocknet.The support material for photographic layers according to the invention is produced in particular by slowly mixing the individual components in the sequence water-alcohol mixture, montmorillonite, colloidals, aluminum-modified silica, copolymer dispersion, alkali salt of organic polyacid, aziridine, the desired pH - Sets the value with ammonia solution, applies the casting solution thus obtained in the desired layer thickness and then dries.

Die Prüfung der antistatischen Eigenschaften erfolgt durch Messung des Oberflächenwiderstands mit einer Elektrode nach DIN 53482.The antistatic properties are tested by measuring the surface resistance with an electrode according to DIN 53482.

Zur Prüfung der Bedruckbarkeit und der Abriebund Bäderfestigkeit werden Muster mit handelsüblichen Farbbändern bedruckt. Zur Prüfung der Muster auf chemische und mechanische Beanspruchungen, wie sie während des Entwicklungsvorganges auftreten, wurden die Muster nach dem Bedrucken 30 sec in einen handelsüblichen Entwickler getaucht und mit Wasser kurz abgespült. Anschließend werden mit dem Finger Friktionen auf die bedruckte Rückseite ausgeübt. Es wird geprüft, ob dabei der Druck verwischt wird oder Verfärbungen durch Auswaschen einer Farbkomponente der Druckfarbe auftreten. Ein nach Entwicklerbad und Friktion verwischter Druck ist entweder auf schlechte Haftung des Drucks auf der Rückseite des fotografischen Materials oder auf geringe Abriebfestigkeit der rückseitigen Beschichtung zurückzuführen. Letztere, also Beschädigungen durch Abrieb der rückseitigen Oberfläche lassen sich bei Betrachtung im Gegenlicht erkennen.To check the printability and the abrasion and bath resistance, samples are printed with standard color ribbons. To test the samples for chemical and mechanical stresses, as they occur during the development process, the samples were printed in a 30 sec commercial developer dipped and rinsed briefly with water. Then you apply finger friction to the printed back. It is checked whether the print is blurred or whether discoloration occurs due to the washing out of a color component of the printing ink. A print smeared after developer bath and friction is either due to poor adhesion of the print on the back of the photographic material or to low abrasion resistance of the back coating. The latter, i.e. damage due to abrasion of the back surface, can be seen when viewed against the light.

Zur Überprüfung der Klebebandhaftung wird das Muster mit einem handelsüblichen Klebeband (z.B. 3 M-Klebeband 8422) versehen und dieses mit einem definierten Gewicht (8 kg-Rolle) fixiert. Anschließend wird das Muster in 1,5 cm breite Streifen geschnitten und das Klebeband teilweise abgezogen. Die so präparierte Probe wird in einen Bruchlasttester eingespannt, in dem das Klebeband von der Unterlage in einem Winkel von 180° mit einer Geschwindigkeit von 20 cm/min abgezogen wird. Die zum Abziehen benötigte Kraft wird gemessen. Da die Klebebandhaftung auch bei mechanischer Beanspruchung in Entwicklungslösungen ausreichend sein muß, wird vor dem Abziehen des Klebebands ein Tropfen Wasser auf die Grenze zwischen dem fotografischen Material und dem Klebeband gegeben.To check the adhesive tape adhesion, the sample is provided with a commercially available adhesive tape (eg 3 M adhesive tape 8422) and this is fixed with a defined weight (8 kg roll). Then the pattern is cut into 1.5 cm wide strips and the adhesive tape is partially peeled off. The sample prepared in this way is clamped in a breaking load tester in which the adhesive tape is removed from the base at an angle of 180 ° at a speed of 20 cm / min. The force required to pull off is measured. Since the adhesive tape adhesion must be sufficient even under mechanical stress in developing solutions, a drop of water is placed on the boundary between the photographic material and the adhesive tape before the adhesive tape is peeled off.

Zur Prüfung der Schmutzaufnahmefähigkeit wird ein handelsüblicher Color-Entwickler mit einer Füllhöhe von ca. 2 cm in eine offene Schale gefüllt und über eine Woche an der Luft stehen gelassen. Nach dieser Zeit hat sich an der Oberfläche eine dunkle Teerschicht aus Oxydationsprodukten gebildet. Diese teerartige Oberfläche wird mit dem zu prüfenden Muster abgezogen. Anschließend wird das Muster unter fließendem Wasser abgewaschen und an der Luft getrocknet. Das Ausmaß der Schmutzaufnahme läßt sich durch die Verfärbung auf der Rückseite visuell gut beurteilen.To check the dirt absorption capacity, a commercially available color developer with a filling height of approx. 2 cm is placed in an open bowl and left to stand in the air for a week. After this time, a dark tar layer of oxidation products formed on the surface. This tar-like surface is peeled off with the sample to be tested. The pattern is then washed under running water and air dried. The degree of dirt pick-up can be assessed visually by the discoloration on the back.

Die nachfolgende Tabelle 1 enthält beispielhaft Zusammensetzungen von Mischungen für erfindungsgemäße antistatische Schichten. Die zugehörigen Prüfwerte sind in Tabelle 2 enthalten.

Figure imgb0001
Figure imgb0002
 Table 1 below contains examples of compositions of mixtures for antistatic layers according to the invention. The associated test values are contained in Table 2.
Figure imgb0001
Figure imgb0002

Claims (10)

  1. Support material for photographic coatings having anti-static rear face coating, characterized in that the rear face coating contains at least the following components:
    a) a colloidal aluminium-modified silica,
    b) an alkali salt of an organic poly-acid,
    c) an aqueous dispersion of at least one copolymer of alkyl acrylate, methacrylic acid and at least one other copolymerized component, having a content of free carboxyl groups of 1 - 10 mol-% and of free hydroxyl groups of 0 - 20 mol-%,
    d) a trifunctional aziridin as cross-linking agent.
  2. Photographic support material according to Claim 1, characterized in that the other components are methyl methacrylate and hydroxyethyl acrylate.
  3. Photographic support material according to Claim 1, characterized in that the other component is styrene, the proportion of methacrylic acid in this case being 10 mol-%.
  4. Photographic support material according to Claim 1, characterized in that the sum of the polar groups in c) does not exceed 25 mol-%.
  5. Photographic support material according to Claim 1 or 2, characterized in that the copolymer is a terpolymer of styrene, C₁ - C₄ alkyl acrylate and in 10 % methacrylic acid.
  6. Photographic support material according to one of Claims 1 to 5, characterized in that the anti-static coating additionally contains a sodium magnesium silicate of the montmorillonite type.
  7. Photographic support material according to Claim 1, characterized in that the alkali salt of an organic poly-acid is an alkali salt of polystyrene sulphonic acid or naphthalene polysulphonic acid or an alkali cellulose sulphate.
  8. Photographic support material according to Claim 1, characterized in that the support material is a polyolefin-coated paper.
  9. Photographic support material according to one of Claims 1 to 8, characterized by the following quantitative relationships of the components, each referred to the dry coating: colloidal silica: 23 - 70 % by wt. alkali salt of the poly-acid: 3 - 30 % by wt. polymer binder: 30 - 70 % by wt. montmorillonite: 0 - 30 % by wt. aziridin: 2 - 18 % by wt.
  10. Method of making a support material for photographic coatings according to one of Claims 1 to 9, characterized in that the individual components are mixed slowly and with stirring in the already prepared solvent mixture of water and isopropyl alcohol as follows: montmorillonite, colloidal aluminium-modified silica, copolymer dispersion, alkali salt of the organic poly-acid, aziridin, the desired pH value is adjusted with ammonia solution, and the thus obtained casting solution is applied to the desired coating thickness and then dried.
EP87116068A 1987-01-06 1987-10-31 Antistatic photographic support material Expired - Lifetime EP0274017B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87116068T ATE78938T1 (en) 1987-01-06 1987-10-31 ANTISTATIC PHOTOGRAPHIC SUPPORT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873700183 DE3700183A1 (en) 1987-01-06 1987-01-06 ANTISTATIC PHOTOGRAPHIC CARRIER MATERIAL
DE3700183 1987-01-06

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EP0274017A2 EP0274017A2 (en) 1988-07-13
EP0274017A3 EP0274017A3 (en) 1990-02-28
EP0274017B1 true EP0274017B1 (en) 1992-07-29

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US (1) US5104779A (en)
EP (1) EP0274017B1 (en)
JP (1) JPS63173044A (en)
AT (1) ATE78938T1 (en)
DE (2) DE3700183A1 (en)
ES (1) ES2033285T3 (en)
GR (2) GR920300032T1 (en)

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DE3735871A1 (en) * 1987-10-23 1989-05-03 Schoeller F Jun Gmbh Co Kg PHOTOGRAPHIC SUPPORT MATERIAL FOR LIGHT-SENSITIVE LAYERS IN THE FORM OF A PLASTIC-COATED PAPER OR A PLASTIC SOLVE WITH A BACK COATING
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JPS63173044A (en) 1988-07-16
DE3780791D1 (en) 1992-09-03
EP0274017A3 (en) 1990-02-28
US5104779A (en) 1992-04-14
ES2033285T3 (en) 1993-03-16
EP0274017A2 (en) 1988-07-13
ATE78938T1 (en) 1992-08-15
GR920300032T1 (en) 1992-09-11
GR3005814T3 (en) 1993-06-07
DE3700183A1 (en) 1988-07-14

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