EP0697620A1 - Photographic support material comprising a back-side coating - Google Patents
Photographic support material comprising a back-side coating Download PDFInfo
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- EP0697620A1 EP0697620A1 EP95112373A EP95112373A EP0697620A1 EP 0697620 A1 EP0697620 A1 EP 0697620A1 EP 95112373 A EP95112373 A EP 95112373A EP 95112373 A EP95112373 A EP 95112373A EP 0697620 A1 EP0697620 A1 EP 0697620A1
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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
- G03C1/95—Photosensitive materials characterised by the base or auxiliary layers rendered opaque or writable, e.g. with inert particulate additives
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
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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
- G03C1/7614—Cover layers; Backing layers; Base or auxiliary layers characterised by means for lubricating, for rendering anti-abrasive or for preventing adhesion
-
- 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
- G03C1/81—Photosensitive materials characterised by the base or auxiliary layers characterised by anticoiling means
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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
- G03C1/853—Inorganic compounds, e.g. metals
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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
- G03C1/89—Macromolecular substances therefor
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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
- G03C1/7614—Cover layers; Backing layers; Base or auxiliary layers characterised by means for lubricating, for rendering anti-abrasive or for preventing adhesion
- G03C2001/7628—Back layer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/259—Silicic material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/269—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension including synthetic resin or polymer layer or component
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/27—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
- Y10T428/273—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.] of coating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/27—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
- Y10T428/273—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.] of coating
- Y10T428/277—Cellulosic substrate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2852—Adhesive compositions
- Y10T428/2878—Adhesive compositions including addition polymer from unsaturated monomer
- Y10T428/2891—Adhesive compositions including addition polymer from unsaturated monomer including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
- Y10T428/2993—Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31652—Of asbestos
- Y10T428/31667—Next to addition polymer from unsaturated monomers, or aldehyde or ketone condensation product
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
- Paints Or Removers (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Die Erfindung betrifft ein Trägermaterial für fotografische Schichten in Form eines kunststoffbeschichteten Papieres oder einer Kunststoffolie mit einer Rückseitenschicht, sowie eine wässrige Beschichtungsmasse zur Herstellung dieser Rückseitenschicht.The invention relates to a carrier material for photographic layers in the form of a plastic-coated paper or a plastic film with a backing layer, and to an aqueous coating composition for producing this backing layer.
Rückseitenschichten sind diejenigen Schichten, die der später aufzutragenden fotografischen Emulsion gegenüberliegen. Die Rückseitenschichten solcher Trägermaterialien sollen den Kunststoffoberflächen folgende Eigenschaften vermitteln:
- Antistatik, damit bei der Weiterverarbeitung keine Verblitzungen, keine Sortierprobleme und keine verstärkten Schmutzanziehungen stattfinden.
- Beschreib- und Bedruckbarkeit, damit die Materialien gekennzeichnet werden können.
- Geringe Schmutzaufnahme gegenüber teerartigen Oxydationsprodukten fotografischer Entwicklungsbäder.
- Klebebandhaftung, damit beim Entwicklungsprozeß die Rollenwaren aneinander fixiert werden können.
- Antistatic, so that no flashes, no sorting problems and no increased dirt build-up occur during further processing.
- Writeability and printability so that the materials can be labeled.
- Low dirt absorption compared to tar-like oxidation products of photographic processing baths.
- Adhesive tape adhesion so that the roll goods can be fixed to one another during the development process.
Einige Kunden verlangen Rückseitenschichten mit einer Optimierung aller genannter Eigenschaften, andere Kunden bevorzugen Rückseitenschichten mit besonders guten Einzeleigenschaften. Die beiden Patentschriften JP-63 004 231 und DE-PS 37 35 871 belegen dieses.Some customers require backing layers with an optimization of all the properties mentioned, other customers prefer backing layers with particularly good individual properties. The two patents JP-63 004 231 and DE-PS 37 35 871 prove this.
In JP-63 004 231 wird eine Rückseitenschicht beschrieben, die Antistatik, Bedruckbarkeit und geringe Schmutzaufnahme aufweist. Sie wird erzeugt mittels einer Beschichtungsmasse aus Polymerlatex (z.B. carboxylgruppenhaltiges Acrylat-Copolymer), Leitfähigkeitsmittel (z.B. Polystyrolsulfonsäure) und kolloidaler Kieselsäure. Die Beschichtungsmasse kann zusätzlich Hilfsmittel (z.B. Hydroxyethylcellulose) enthalten.JP-63 004 231 describes a back layer which has antistatic properties, printability and low dirt absorption. It is produced using a coating compound made of polymer latex (e.g. carboxyl-containing acrylate copolymer), conductivity agent (e.g. polystyrene sulfonic acid) and colloidal silica. The coating composition can additionally contain auxiliaries (e.g. hydroxyethyl cellulose).
Die so erhaltene Rückseitenschicht weist jedoch keine Beschreibbarkeit mit Bleistiften auf.However, the backing layer obtained in this way is not writable with pencils.
Die DE-PS 37 35 871 beschreibt eine Rückseitenschicht, bei der alle Eigenschaften optimiert wurden, das heißt, diese Schicht läßt sich auch mit Bleistiften beschreiben. Die Beschichtungsmasse für diese Rückseitenschicht setzt sich zusammen aus einem Terpolymer aus überwiegend Styrol und Butadien, einem Leitfähigkeitsmittel (z.B. Polystyrolsulfonsäure), einer kolloidalen Kieselsäure und einer Kieselsäure mit einer mittleren Teilchengröße von 3 bis 6 µm. Bei sehr guten antistatischen Eigenschaften ist die Bleistiftbeschreibbarkeit fast gut bis gut und die Schmutzaufnahme noch gering bis sehr gering. Beide Eigenschaften sind noch verbesserungsfähig.DE-PS 37 35 871 describes a back layer in which all properties have been optimized, that is, this layer can also be described with pencils. The coating composition for this back layer consists of a terpolymer of predominantly styrene and butadiene, a conductivity agent (e.g. polystyrene sulfonic acid), a colloidal silica and a silica with an average particle size of 3 to 6 µm. With very good antistatic properties, the pencil writability is almost good to good and dirt absorption is still low to very low. Both properties can still be improved.
Es ist deshalb Aufgabe dieser Erfindung, ein Trägermaterial für fotografische Schichten zur Verfügung zu stellen, das bei ausreichend guten Gesamteigenschaften auf der Rückseite eine sehr gute Beschreibbarkeit mit Bleistiften aufweist und keine Schmutzaufnahme durch fotografische Entwicklerlösungen zeigt.It is therefore an object of this invention to provide a support material for photographic layers which, with good overall properties, has very good writability on the back with pencils and does not show dirt pickup by photographic developer solutions.
Eine weitere Aufgabe dieser Erfindung ist es, eine Beschichtungsmasse zur Verfügung zu stellen, mit der auf der Rückseite von kunststoffbeschichteten Papieren oder Kunststoffolien die oben gewünschte Rückseitenschicht erzielt werden kann.Another object of this invention is to provide a coating composition which can be used to achieve the desired rear side layer on the back of plastic-coated papers or plastic films.
Gelöst wird diese Aufgabe durch eine Beschichtungsmasse bzw. durch eine Rückseitenschicht aus
- einem carboxylgruppenhaltigen Acrylat-Copolymer, das zu mehr als 80 Gew.% aus einem oder mehreren der Monomeren Acrylsäureester, C₁ bis C₆-Alkylacrylsäureester und Styrol besteht, wobei die freien Carboxylgruppen des Acrylat-Copolymeren unvernetzt bleiben,
- einer organischen Polysäure mit freien oder salzartig gebundenen Carbonsäuregruppen oder Sulfonsäuregruppen,
- einer grobkörnigen Kieselsäure mit einer Korngröße von 3 bis 6 µm, einem Porenvolumen von < 1 ml/g und einer Oberfläche von > 400 m²/g (nach BET) und
- einem gut salzverträglichen Verdickungsmittel.
- a carboxyl group-containing acrylate copolymer which consists of more than 80% by weight of one or more of the monomers acrylic acid ester, C₁ to C₆-alkyl acrylate and styrene, the free carboxyl groups of the acrylate copolymer remaining uncrosslinked,
- an organic polyacid with free or salt-bonded carboxylic acid groups or sulfonic acid groups,
- a coarse-grained silica with a grain size of 3 to 6 µm, a pore volume of <1 ml / g and a surface area of> 400 m² / g (according to BET) and
- a good salt-compatible thickener.
In einer besonderen Ausgestaltung der Erfindung enthält die Beschichtungsmasse bzw. die Rückseitenschicht zusätzlich eine kolloidale aluminiummodifizierte Kieselsäure.In a special embodiment of the invention, the coating composition or the back layer additionally contains a colloidal aluminum-modified silica.
Das Verhältnis Acrylat-Copolymer: Leitfähigkeitsmittel ist vorzugsweise 90 : 10 bis 70 : 30.The ratio of acrylate copolymer: conductivity agent is preferably 90:10 to 70:30.
Das Verhältnis Acrylat-Copolymer: grobkörnige Kieselsäure ist vorzugsweise 90 : 10 bis 40 : 60.The ratio of acrylate copolymer: coarse-grained silica is preferably 90:10 to 40:60.
Das Verhältnis Acrylat-Copolymer: kolloidale Kieselsäure ist vorzugsweise 100 : 0 bis 30 : 70
Im Acrylat-Copolymeren werden die freien Carboxylgruppen durch Einpolymerisation von ungesättigten Carbonsäuren erzeugt, z.B. von Acrylsäure, Methacrylsäure oder Maleinsäure. Diese freien Carboxylgruppen tragen zusätzlich zu den Leitfähigkeitsmitteln zur antistatischen Ausrüstung der Rückseitenschicht bei. Sie werden deshalb auch nicht durch Reaktion mit Vernetzungsmitteln blockiert.The ratio of acrylate copolymer: colloidal silica is preferably 100: 0 to 30:70
In the acrylate copolymer, the free carboxyl groups are generated by polymerization of unsaturated carboxylic acids, for example acrylic acid, methacrylic acid or maleic acid. In addition to the conductivity agents, these free carboxyl groups contribute to the antistatic treatment of the back layer. They are therefore not blocked by reaction with crosslinking agents.
Auf die Beschreibbarkeit mit Bleistiften wirken sich Bindemittel (Copolymere), die weiche Kunststoffilme bilden, nachteilig aus. Deshalb wird ein Copolymer eingesetzt, dessen Monomere harte Filme bilden. Das erfindungsgemäße Copolymer setzt sich zusammen zu mehr als 80 Gew.% aus einem oder mehreren der Monomere Acrylsäureester, C₁ bis C₆-Alkylacrylsäureester und Styrol.Binding agents (copolymers), which form soft plastic films, have a disadvantageous effect on the writeability with pencils. A copolymer is therefore used whose monomers form hard films. The copolymer according to the invention is composed of more than 80 wt.% Of one or more of the monomers acrylic acid ester, C₁ to C₆-alkyl acrylate and styrene.
Harte Homopolymere aus den oben genannten Monomeren, wie z.B. Polystyrol oder Polymethylmethacrylat haben Kugeldruckhärten von 120-200 N/mm², gemessen nach DIN 53456, während weiche Homopolymere, wie beispielsweise Polyolefine Kugeldruckhärten von 10-100 N/mm² aufweisen.Hard homopolymers from the above monomers, e.g. Polystyrene or polymethyl methacrylate have ball indentations of 120-200 N / mm², measured according to DIN 53456, while soft homopolymers, such as polyolefins, have ball indentations of 10-100 N / mm².
Die als Leitfähigkeitsmittel eingesetzte organische Polysäure, bzw. das Salz dieser Säure ist vorzugsweise das Alkalisalz der Säure, wobei die Säure eine Carbonsäure wie Polyacrylsäure oder eine Sulfonsäure wie Polystyrolsulfonsäure oder Naphtalinsulfonsäure sein kann.The organic polyacid used as the conductivity agent or the salt of this acid is preferably the alkali salt of the acid, it being possible for the acid to be a carboxylic acid such as polyacrylic acid or a sulfonic acid such as polystyrene sulfonic acid or naphthalene sulfonic acid.
Ein Zusatz von grobkörniger Kieselsäure wirkt sich allgemein positiv auf die Beschreibbarkeit mit Bleistuften aus. Es hat sich aber überraschenderweise herausgestellt, daß die Angabe der Teilchengröße dieser Kieselsäure kein eindeutiger Maßstab für diese positive Wirkung ist. Das Porenvolumen und insbesondere die Oberfläche haben einen wesentlichen Einfluß (Vergleiche Beispiel B1 mit Vergleich V1). Erfindungsgemäß hat die grobkörnige Kieselsäure eine Teilchengröße von 3 bis 6 µm, ein Porenvolumen von < 1 ml/g und eine Oberfläche von > 400 m²/g. In einer besonders bevorzugten Ausgestaltung hat die Kieselsäure eine Oberfläche von 600 bis 800 m²/g.The addition of coarse-grained silica generally has a positive effect on the writeability with pencil scents. Surprisingly, it has been found that the indication of the particle size of this silica is not a clear yardstick for this positive effect. The pore volume and in particular the surface have a significant influence (compare example B1 with comparison V1). According to the invention, the coarse-grained silica has a particle size of 3 to 6 μm, a pore volume of <1 ml / g and a surface area of> 400 m² / g. In a particularly preferred embodiment, the silica has a surface area of 600 to 800 m² / g.
Gut salzverträgliche Verdickungsmittel sind beispielsweise Hydroxyethylcellulose oder wasserlösliche carboxylgruppenhaltige Copolymere auf Acrylatbasis. Andere, nicht gut salzverträgliche Verdickungsmittel wie Carboxymethylcellulosen führen zu Ausflockungen in der Beschichtungsmasse.Salt-compatible thickeners are, for example, hydroxyethyl cellulose or water-soluble carboxyl-containing copolymers based on acrylate. Other thickeners which are not well tolerated by salt, such as carboxymethyl celluloses, lead to flocculation in the coating composition.
Alle Komponenten werden mit Wasser zu einer Beschichtungsmasse zusammengemischt, wobei der Mischung insgesamt noch kleine, nicht störende Mengen, d.h. < 5 Gew.% an Netzmitteln, Dispergiermitteln, wasserlöslichen Bindemitteln oder Farbstoffen zugesetzt werden können.All components are mixed together with water to form a coating composition, the mixture still comprising small, non-disturbing amounts, i.e. <5% by weight of wetting agents, dispersing agents, water-soluble binders or dyes can be added.
Die Beschichtungsmasse kann mit allen üblichen Auftragsaggregaten auf die Rückseite des zu beschichtenden Trägermaterials aufgebracht und anschließend getrocknet werden, wobei die aufgebrachte Menge so gewählt wird, daß nach dem Trocknen ein Auftragsgewicht von 0,2 bis 2,0 g/m² vorliegt.The coating composition can be applied to the back of the carrier material to be coated using all customary application units and then dried, the amount applied being chosen so that an application weight of 0.2 to 2.0 g / m 2 is present after drying.
Die wässrige Beschichtungsmasse kann in folgenden Gewichtsmengen variieren:
Die folgenden Beispiele sollen die Erfindung verdeutlichen:
Ein Basispapier von 175 g/m² Flächengewicht, das auf der Vorderseite mit 30 g/m² Polyethylen, welches 10 Gew.% Titandioxid enthielt, und auf der Rückseite mit 30 g/m² Polyethylen beschichtet wurde, wurde auf der Rückseite erst einer Coronaentladung unterworfen und dann mit den in Tabelle 1 aufgeführten Beschichtungsmassen beschichtet. Zur Dosierung des Auftragsgewichtes wurde ein 10er Rollrakel (= 0,1 mm Durchmesser des Wicklungsdrahtes) verwendet. Im Heißluftkanal wurden die aufgetragenen Schichten zu den in Tabelle 1 aufgeführten Auftragsgewichten getrocknet.
A base paper of 175 g / m² basis weight, which was coated on the front with 30 g / m² of polyethylene, which contained 10% by weight of titanium dioxide, and on the back with 30 g / m² of polyethylene, was first subjected to a corona discharge on the back and then coated with the coating compositions listed in Table 1. A 10-piece doctor blade (= 0.1 mm diameter of the winding wire) was used to meter the application weight. The layers applied were dried in the hot air duct to the application weights listed in Table 1.
Als Vergleiche wurden unten denselben Bedingungen wie in den Beispielen Varianten der Beschichtungsmasse B1 aufgetragen.
Die mit den Beschichtungsmassen der Beispiele und Vergleichsbeispiele hergestellten Trägermaterialien wurden den folgenden Prüfungen unterzogen:
Die Prüfung der antistatischen Eigenschaften erfolgte durch Messung des Oberflächenwiderstandes mit einer Kammelektrode nach DIN-VDE 303T3.The carrier materials produced with the coating compositions of the examples and comparative examples were subjected to the following tests:
The antistatic properties were tested by measuring the surface resistance with a comb electrode according to DIN-VDE 303T3.
Die Prüfung der Bedruckbarkeit wurde mit den handelsüblichen Farbbändern "New Cherry Ribbon" und "Kodak Back Printer CAT 1402114" durchgeführt. Die Muster wurden auf einer Schreibmaschine mit Typenanschlag über die Farbbänder bedruckt und anschließend für die Dauer von 3,5 Minuten in den Kodakentwickler EP2 bei 38 °C gegeben. Danach wurden die flachgelegten Muster 5 mal mit einer mit Samt bezogenen und wassergetränkten 180 g schweren Rolle bei einer Zuggeschwindigkeit von 10 cm/sek. überwischt. Die Wischfestigkeit des Schriftbildes wurde visuell beurteilt.The printability was checked using the commercial ribbons "New Cherry Ribbon" and "Kodak Back Printer CAT 1402114". The samples were printed on the typewriter on a typewriter with a type stop and then placed in the Kodak developer EP2 at 38 ° C. for 3.5 minutes. Then the flattened samples were 5 times with a velvet covered and water-soaked 180 g roll at a speed of 10 cm / sec. smeared. The smudge resistance of the typeface was assessed visually.
Die Beschreibbarkeit mit Bleistiften wurde mit Bleistifthärte HB durchgeführt und visuell beurteilt.The writability with pencils was carried out with pencil hardness HB and assessed visually.
Zur Prüfung der Schmutzaufnahme wurden 250 ml des handelsüblichen Farbentwicklers CP-1R18P bei 40 °C in einem Becherglas 12 Stunden mit 500 U/min. gerührt. Dabei bildete sich auf der Oberfläche eine dunkle teerartige Schicht aus Oxydationsprodukten. Der Entwickler wurde dann auf ABS-Platten (AcrylnitrilButadien-Styrol-Copolymer) gegossen, auf denen sich die teerartige Schicht ablagerte. Die Muster wurden mit der Rückseite auf die Platten gelegt, mit Papier abgedeckt und 3 mal mit einer 2 kg schweren Walze überrollt. Anschließend wurden die Muster mit fließendem Wasser 1 Minute abgespült und zum Trocknen aufgehängt. Der haftengebliebene Schmutz wurde als Schmutzaufnahme visuell beurteilt.To check the dirt absorption , 250 ml of the commercially available color developer CP-1R18P at 40 ° C in a beaker at 500 rpm for 12 hours. touched. A dark tar-like layer of oxidation products formed on the surface. The developer was then poured onto ABS plates (acrylonitrile-butadiene-styrene copolymer) on which the tar-like layer was deposited. The patterns were upside down the plates are placed, covered with paper and rolled over 3 times with a 2 kg roller. The samples were then rinsed with running water for 1 minute and hung up to dry. The dirt adhered was assessed visually as dirt pick-up.
Zur Prüfung der Klebebandhaftung wurde das 5 cm breite handelsübliche 3M-Klebeband Nr. 8422 auf die Rückseitenschicht aufgedrückt und mit einer 8 kg schweren Walze angepreßt. Von ausgestanzten 15 mm breiten Streifen dieses Verbundes wurde das Klebeband in einem Bruchlasttester in einem Winkel von 180 °C mit einer Geschwindigkeit von 20 cm/min und unter ständiger Benetzung der Trennstelle mit Wasser vom Muster abgezogen. Die zum Abziehen benötigte Kraft wurde gemessen. Ein Wert von > 2,0 N/15 mm bedeutet gute Haftung, ein Wert von > 1,0 N/15 mm bedeutet ausreichende Haftung.To test the adhesive tape adhesion , the 5 cm wide commercially available 3M adhesive tape No. 8422 was pressed onto the back side layer and pressed on with an 8 kg roller. The adhesive tape was removed from the sample from punched-out 15 mm wide strips of this composite in a breaking load tester at an angle of 180 ° C. at a speed of 20 cm / min and with constant wetting of the separation point with water. The pulling force was measured. A value of> 2.0 N / 15 mm means good adhesion, a value of> 1.0 N / 15 mm means sufficient adhesion.
Die Prüfergebnisse sind in der nachfolgenden Tabelle 3 und dem sich anschließenden Absatz zusammengefaßt.
Die Beschichtungsmasse des Vergleichsbeispiels V2 (ohne Hydroxyethylcellulose) zeigte nur eine geringe Stabilität. Schon nach 1-2 Stunden trat deutliche Sedimentation der grobkörnigen Kieselsäure auf, während die anderen Beschichtungsmassen (mit Hydroxyethylcellulose) noch nach 24 Stunden stabil, d.h. ohne nennenswerte Sedimentation waren.The coating composition of comparative example V2 (without hydroxyethyl cellulose) showed only a low stability. Significant sedimentation of the coarse-grained silica occurred after only 1-2 hours, while the other coating compositions (with hydroxyethyl cellulose) remained stable after 24 hours, i.e. were without significant sedimentation.
Die Beispiele zeigen, daß bei guten Allgemeineigenschaften die Schmutzaufnahme und die Beschreibbarkeit mit Bleistiften auf hervorragende Werte verbessert werden konnten. Die Stabilität der erfindungsgemäßen Beschichtungsmassen gewährleistet eine problemlose Verarbeitung.The examples show that, with good general properties, the dirt absorption and the writeability with pencils could be improved to excellent values. The stability of the coating compositions according to the invention ensures problem-free processing.
Claims (14)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE4428941 | 1994-08-16 | ||
DE4428941A DE4428941C2 (en) | 1994-08-16 | 1994-08-16 | Support for photographic recording materials |
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EP0697620A1 true EP0697620A1 (en) | 1996-02-21 |
EP0697620B1 EP0697620B1 (en) | 1998-03-25 |
Family
ID=6525755
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP95112373A Expired - Lifetime EP0697620B1 (en) | 1994-08-16 | 1995-08-06 | Photographic support material comprising a back-side coating |
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US (1) | US5756200A (en) |
EP (1) | EP0697620B1 (en) |
JP (1) | JP3430232B2 (en) |
DE (2) | DE4428941C2 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH10111545A (en) * | 1996-10-08 | 1998-04-28 | Konica Corp | Silver halide photographic sensitive material |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS634231A (en) | 1986-06-24 | 1988-01-09 | Oji Paper Co Ltd | Substrate body for photographic printing paper |
EP0274017A2 (en) * | 1987-01-06 | 1988-07-13 | Felix Schoeller jr. Papierfabrik GmbH & Co. KG | Antistatic photographic support material |
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 |
EP0496037A1 (en) * | 1991-01-19 | 1992-07-29 | Felix Schoeller jr. Papierfabrik GmbH & Co. KG | Coating mass for the reverse of a photographic substrate and process of preparation thereof |
EP0616252A2 (en) * | 1993-03-16 | 1994-09-21 | FELIX SCHOELLER JR. FOTO- UND SPEZIALPAPIERE GmbH & Co. KG. | Photographic support |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5064717A (en) * | 1989-04-28 | 1991-11-12 | Kanzaki Paper Manufacturing Co., Ltd. | Adhesive sheet |
-
1994
- 1994-08-16 DE DE4428941A patent/DE4428941C2/en not_active Expired - Lifetime
-
1995
- 1995-08-06 EP EP95112373A patent/EP0697620B1/en not_active Expired - Lifetime
- 1995-08-06 DE DE59501690T patent/DE59501690D1/en not_active Expired - Fee Related
- 1995-08-16 JP JP23079995A patent/JP3430232B2/en not_active Expired - Fee Related
-
1997
- 1997-04-22 US US08/841,471 patent/US5756200A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS634231A (en) | 1986-06-24 | 1988-01-09 | Oji Paper Co Ltd | Substrate body for photographic printing paper |
EP0274017A2 (en) * | 1987-01-06 | 1988-07-13 | Felix Schoeller jr. Papierfabrik GmbH & Co. KG | Antistatic photographic support material |
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 |
EP0496037A1 (en) * | 1991-01-19 | 1992-07-29 | Felix Schoeller jr. Papierfabrik GmbH & Co. KG | Coating mass for the reverse of a photographic substrate and process of preparation thereof |
EP0616252A2 (en) * | 1993-03-16 | 1994-09-21 | FELIX SCHOELLER JR. FOTO- UND SPEZIALPAPIERE GmbH & Co. KG. | Photographic support |
Also Published As
Publication number | Publication date |
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DE4428941A1 (en) | 1996-02-22 |
DE4428941C2 (en) | 1998-04-16 |
US5756200A (en) | 1998-05-26 |
JPH08171174A (en) | 1996-07-02 |
DE59501690D1 (en) | 1998-04-30 |
EP0697620B1 (en) | 1998-03-25 |
JP3430232B2 (en) | 2003-07-28 |
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