EP0713151B1 - Electrophotographic image bearing material - Google Patents

Electrophotographic image bearing material Download PDF

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Publication number
EP0713151B1
EP0713151B1 EP95114077A EP95114077A EP0713151B1 EP 0713151 B1 EP0713151 B1 EP 0713151B1 EP 95114077 A EP95114077 A EP 95114077A EP 95114077 A EP95114077 A EP 95114077A EP 0713151 B1 EP0713151 B1 EP 0713151B1
Authority
EP
European Patent Office
Prior art keywords
image carrier
carrier material
material according
layer
receiving layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95114077A
Other languages
German (de)
French (fr)
Other versions
EP0713151A1 (en
Inventor
Rolf Dr. Ebisch
Reiner Dr. Gumbiowski
Hartmut Dr. Schulz
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.)
Felix Schoeller Jr Foto und Spezialpapiere GmbH
Original Assignee
Felix Schoeller Jr Foto und Spezialpapiere GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP0713151A1 publication Critical patent/EP0713151A1/en
Application granted granted Critical
Publication of EP0713151B1 publication Critical patent/EP0713151B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G03G7/002—Organic components thereof
    • G03G7/0026—Organic components thereof being macromolecular
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G03G7/0013—Inorganic components thereof
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G03G7/002—Organic components thereof
    • G03G7/0026—Organic components thereof being macromolecular
    • G03G7/0033—Natural products or derivatives thereof, e.g. cellulose, proteins
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G03G7/002—Organic components thereof
    • G03G7/0026—Organic components thereof being macromolecular
    • G03G7/004—Organic components thereof being macromolecular obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0053—Intermediate layers for image-receiving members
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0086—Back layers for image-receiving members; Strippable backsheets
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • 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]
    • Y10T428/31971—Of carbohydrate
    • Y10T428/31993—Of paper

Definitions

  • the invention describes an image carrier material for electrophotographic processes.
  • Electrophotographic processes generate from a template a latent electrostatic image of a semiconductor material, which is made visible or developed using toners.
  • the end product can either be the semiconductor material itself (e.g. zinc oxide paper) or an image carrier material onto which the toner image of the semiconductor material (e.g. selenium drum) is transmitted.
  • the latter process is now called copying State of the art in all office complexes.
  • the US 51 12 717 patent describes an image carrier material electrophotographic color process, in its surface after the toner imaging, a texture is embossed to to give the image a surface similar to photo paper.
  • the image carrier material consists of a core or base paper with a front and a back coating, which are both made of plastics.
  • the front coating is preferably polystyrene
  • the backside coating is preferably polyolefin.
  • the image carrier material of this patent has both sides of pure plastic layers and can end users does not convey the feeling that one Mediated photo paper. It also lacks properties such as high whiteness, antistatic, writability on the back.
  • EP 0 496 037 A1 describes a coating material for the back of photographic substrates. This Backside coating is said to be printable with thermal printers with low dirt absorption and discoloration through developing baths, good abrasion and bath strength and ensure good anti-static equipment.
  • the object of the invention is to provide an image carrier material for to provide electrophotographic processes, that has the character of a photo paper and the one Provides image quality that comes close to that of a photo.
  • an image carrier material for electrophotographic processes which is a base paper as core material with arranged on both sides of the base paper Plastic layers of thermoplastics and one Contains an antistatic layer on one of the plastic layers, being on the not with an antistatic layer provided plastic layer a receiving layer for the Toner image is arranged and the receiving layer is a polymer with an interfacial tension of> 32 mN / m and a film formation temperature according to DIN 53787 of ⁇ 100 ° C contains.
  • base paper be made from bleached cellulose.
  • the base papers can be white pigments such as titanium dioxide or Contain calcium carbonate, they can be neutral or alkaline e.g. using reactive sizing agents such as alkyl ketene dimers or derivatives of dialkyl succinic anhydride they can be acid-glued, e.g. with resin glue (Kopophonium resin glue) and aluminum sulfate, they can be wet-proof be equipped, e.g. with melamine-formaldehyde resins or polyamide aminepichlorohydrin resins, and / or they can wear additional size press coatings.
  • resin glue Kopophonium resin glue
  • aluminum sulfate aluminum sulfate
  • the bilateral or applied on one side using size presses in the paper machine Coatings serve, for example, for further Consolidation of the fiber structure or give the paper surfaces
  • Property improvements such as higher brightness Addition of e.g. optical brighteners or antistatic Addition of e.g. Alkali salts or improved adhesion of layers to be applied later.
  • Liability improvers or Structure-strengthening additives are polymers such as starch, cellulose derivatives, Alginates, polyvinyl alcohol, polyacrylate dispersions, water-soluble polyacrylic acids, styrene copolymers and similar connections. All the above-mentioned quality-improving additives to paper are but not absolutely necessary for the use according to the invention.
  • thermoplastic layers preferably by a melt extrusion coating are preferably polyolefins such as polyethylene, polypropylene or olefin copolymers, e.g. built up from ethylene with other ⁇ -olefins or with vinyl acetate or with (meth) acrylic acid esters.
  • polyolefins such as polyethylene, polypropylene or olefin copolymers, e.g. built up from ethylene with other ⁇ -olefins or with vinyl acetate or with (meth) acrylic acid esters.
  • thermoplastics are also polystyrene, polycarbonate, Suitable for polyvinyl and polyacrylic compounds and polyurethanes.
  • the application weight of the plastic coatings is on both Sides of the base paper approximately the same, although the Thermoplastics are the same. This guarantees good flatness of the end product. With different thermoplastics The front and back must have the different tensile stresses through adjusted different order weight be balanced.
  • the plastic layer applied on the back as such meets the requirements, the plastic layer is on the front is set for good optical properties, i.e. it has high light reflection, high brightness and high whites. You can also by adding shading dyes be adapted to aesthetic or fashionable color requirements. High light reflection and high brightness are achieved by admixing of white pigments, preferably by titanium dioxide, and optical brighteners achieved. The amount of white pigments is usually between processing reasons 10% by weight and 25% by weight, but it can be up to 50% by weight to reach.
  • the receiving layer on the front which is on the Plastic layer contains as an essential component a polymer that has good adhesion to the transferred Guaranteed toner image.
  • a polymer that has good adhesion to the transferred Guaranteed toner image.
  • Polymers with an interfacial tension of> 32 mN / m and a Film formation temperature according to DIN 53787 of ⁇ 100 ° C especially are well suited.
  • Such polymers are polystyrenes, Polyacrylates, polyalkyl methacrylates, ionomers, polyvinylidene chlorides, Cellulose esters and copolymers of two or more the monomers butadiene, styrene, acrylonitrile, acrylic esters, Alkyl acrylate.
  • the receiving layers can advantageously be used as non-stick agents finely divided silicas such as colloidal aluminum-modified Contain silica or shading dyes, optical brighteners or wetting agents or defoamers.
  • non-stick agents finely divided silicas such as colloidal aluminum-modified Contain silica or shading dyes, optical brighteners or wetting agents or defoamers.
  • these additives are functional of the image carrier material but not required.
  • the antistatic layer on the back which is located on the plastic layer, contains inorganic salts, preferably alkali salts or organic sulfonic acids or carboxylic acids or their alkali salts or metal oxides, in a binder as an antistatic.
  • the antistatic effect measured as the surface resistance of the layer, should have values between 10 9 ⁇ / cm and 10 13 ⁇ / cm.
  • this antistatic layer can be given good printability and writeability by the choice of binders and other additives.
  • the binder In order to be printable with non-aqueous or non-polar printing inks, the binder must also have a hydrophobic character; copolymers of two or more of the monomers of butadiene, styrene, acrylonitrile, acrylic acid ester and vinyl acetate are suitable. For writing with pencils, silicas are added, which give the necessary abrasion.
  • the individual layers of the image carrier material according to the invention have the following basis weight ranges: 1 Receiving layer 0.1 g / m 2 to 1 g / m 2 2 Plastic layer 10 g / m 2 to 50 g / m 2 3rd Base paper 60 g / m 2 to 200 g / m 2 4th Plastic layer 10 g / m 2 to 50 g / m 2 5 Antistatic layer 0.05 g / m 2 to 2 g / m 2
  • the receiving layer for receiving the toner image from Semiconductor material has good temperature resistance and high toner absorption, so that on the Semiconductor material only a little residual toner remains. After fixing, there is very good toner adhesion reached.
  • the plastic layer on the front gives the later Picture a good background whiteness and brightness. It paves the unevenness of the surface of the base paper and gives the entire front coating certain compressibility. This will make an improved one more complete contact between transfer paper and Toner image reached on the semiconductor material, whereby the toner transfer is more complete, no imperfections (missing dots) occur in the image and the image sharpness is improved.
  • the base paper is the general backing material of the Image support material, there is the necessary strength and stiffness.
  • the plastic layer on the back gives the composite a very good flatness and seals the porous base paper from, so that in the copier between toner transfer and toner fixing that to the paper guide station applied vacuum remains fully effective and this ensures exact paper guidance and optimal plan keeping of the paper and an intimate contact between Image carrier material and preheating plates or heating roller is guaranteed.
  • the base paper In conjunction with the plastic layer on the front the base paper is sealed on both sides. This keeps the moisture content of the base paper relatively constant, even with strongly fluctuating ambient humidity.
  • the paper moisture one not with plastics coated paper has a very big impact on the electrical surface and volume resistance this paper so that when the ambient humidity fluctuates also fluctuating quality in image transmission would occur.
  • the antistatic layer on the back improves the Stackability of the image carrier material, i.e. the Removing individual sheets of paper from a stack and that Placing individual sheets of paper on top of each other happens trouble-free because of an electrostatic charge is avoided.
  • the entire image carrier material thus constructed enables high quality imaging and owns the Character of a photo paper.
  • This structure also enables the creation of high-gloss images through a subsequent treatment of the finished Image by pressure and temperature. This is enough, for example ironing or running through a high-gloss heating roller at about 10bar pressure and 180 ° C temperature. This Effect is not possible without a thermoplastic intermediate layer.
  • a blend of 70% by weight bleached hardwood sulfate pulp was at a consistency of 4% to a freeness ground from 35 ° SR.
  • a base paper of 170 g / m 2 was produced on a Fourdrinier machine with a smoothing unit.
  • This base paper was processed in a tandem extruder the following two plastic layers, where after a corona treatment first the back and then coated the front.
  • the following antistatic layers and then the following receiving layers were produced in a coating machine, in each case after a previous corona pretreatment of the corresponding plastic layer.
  • the respective aqueous coating compositions were applied to the material to be coated with a scoop roller, metered in with a doctor rod and dried in a hot air duct at an air temperature of 90.degree.
  • the paper coated with the two plastic layers was provided with various combinations of the receiving layers and antistatic layers and led to the following examples: example Antistatic layer g / m 2 Receiving layer g / m 2 A1 A2 E1 E2 1 0.2 0.4 2 0.2 0.9 3rd 0.7 0.4 4th 0.7 0.9
  • Photo character The illustrated end product was assessed regardless of the image quality according to whether, after the subjective feeling when touching or grasping or handling, the test person conveyed the feeling of holding a photographic image in his hand.
  • Feeding from the stack The feeding of single sheets from the stack into the copier was monitored for faults.
  • Scratch resistance The finished picture was pulled under a rake, the 6 individual tines of which have weights of different weights (up to a maximum of 100 g). The pulling speed was 0.8 cm / s.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Laminated Bodies (AREA)
  • Paper (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Abstract

This invention describes an image carrier material for electrophotographic processes which provides images similar to photographs and is built up from at least five layers. A base paper is coated on both sides with thermoplastic materials and in addition bears an antistatic layer on the reverse side and a receiving layer for the toner image on the front side.

Description

Die Erfindung beschreibt ein Bildträgermaterial für elektrofotografische Verfahren.The invention describes an image carrier material for electrophotographic processes.

Elektrofotografische Verfahren erzeugen von einer Vorlage auf einem Halbleitermaterial ein latentes elektrostatisches Bild, das mittels Tonern sichtbar gemacht bzw. entwickelt wird. Das Endprodukt kann entweder das Halbleitermaterial selbst sein (z.B. Zinkoxid-Papier) oder ein Bildträgermaterial, auf das das Tonerbild von dem Halbleitermaterial (z.B. Selen-Trommel) übertragen wird. Das letztere Verfahren ist heute als Kopierverfahren in allen Bürokomplexen Stand der Technik.Electrophotographic processes generate from a template a latent electrostatic image of a semiconductor material, which is made visible or developed using toners. The The end product can either be the semiconductor material itself (e.g. zinc oxide paper) or an image carrier material onto which the toner image of the semiconductor material (e.g. selenium drum) is transmitted. The latter process is now called copying State of the art in all office complexes.

In den letzten Jahren haben sich immer mehr sogenannte Farbkopierer durchgesetzt, die nach dem gleichen Verfahren, aber mit farbigen Tonern, arbeiten.In recent years, so-called color copiers have become more and more common enforced by the same procedure, but with colored toners.

Während mit den üblichen Bürokopierern vorwiegend Texte vervielfältigt werden, für die preiswertes Trägermaterial (z.B. "plain paper") ausreichend ist, werden mit den Farbkopierern vorwiegend Bilder vervielfältigt, für die höherwertige Bildträgermaterialien fordert werden.While mostly copying texts with the usual office copiers for which inexpensive carrier material (e.g. "plain paper") is sufficient with the color copiers mainly reproduced images for the higher quality image carrier materials be asked.

Die US 51 12 717-Patentschrift beschreibt ein Bildträgermaterial elektrofotografische Farbverfahren, in dessen Oberfläche nach der Tonerbebilderung eine Textur eingeprägt wird, um dem Bild eine dem Fotopapier ähnliche Oberfläche zu vermitteln. Das Bildträgermaterial besteht aus einem Kern- oder Basispapier mit einer Vorderseiten- und einer Rückseitenbeschichtung, die beide aus Kunststoffen bestehen. Die Vorderseitenbeschichtung ist vorzugsweise Polystyrol, die Rückseitenbeschichtung ist vorzugsweise Polyolefin. Das Bildträgermaterial dieser Patentschrift besitzt auf beiden Seiten reine Kunststoffschichten und kann dem Endverbraucher nicht das Empfinden vermitteln, das ihm ein Fotopapier vermittelt. Es fehlen ihm auch Eigenschaften wie hohe Weiße, Antistatik, Beschreibbarkeit der Rückseite.The US 51 12 717 patent describes an image carrier material electrophotographic color process, in its surface after the toner imaging, a texture is embossed to to give the image a surface similar to photo paper. The image carrier material consists of a core or base paper with a front and a back coating, which are both made of plastics. The front coating is preferably polystyrene, the backside coating is preferably polyolefin. The image carrier material of this patent has both sides of pure plastic layers and can end users does not convey the feeling that one Mediated photo paper. It also lacks properties such as high whiteness, antistatic, writability on the back.

Die EP 0 496 037 A1 beschreibt eine Beschichtungsmasse für die Rückseite fotografischer Schichtträger. Diese Rückseitenbeschichtung soll die Bedruckbarkeit mit Thermodruckern bei geringer Schmutzaufnahme und Verfärbung durch Entwicklungsbäder, guten Abrieb und Bäderfestigkeit und gute antistatische Ausrüstung gewährleisten.EP 0 496 037 A1 describes a coating material for the back of photographic substrates. This Backside coating is said to be printable with thermal printers with low dirt absorption and discoloration through developing baths, good abrasion and bath strength and ensure good anti-static equipment.

Aufgabe der Erfindung ist es, ein Bildträgermaterial für elektrofotografische Verfahren zur Verfügung zu stellen, das den Charakter eines Fotopapiers hat und das eine Bildqualität liefert, die der eines Fotos nahekommt.The object of the invention is to provide an image carrier material for to provide electrophotographic processes, that has the character of a photo paper and the one Provides image quality that comes close to that of a photo.

Gelöst wird diese Aufgabe durch ein Bildträgermaterial für elektrofotografische Verfahren, das ein Basispapier als Kernmaterial mit beidseitig auf dem Basispapier angeordneten Kunststoffschichten aus Thermoplasten und eine Antistatikschicht auf einer der Kunststoffschichten enthält, wobei auf der nicht mit einer Antistatikschicht versehenen Kunststoffschicht eine Empfangsschicht für das Tonerbild angeordnet ist und die Empfangsschicht ein Polymer mit einer Grenzflächenspannung von > 32 mN/m und einer Filmbildungstemperatur nach DIN 53787 von < 100°C enthält. This task is solved by an image carrier material for electrophotographic processes, which is a base paper as core material with arranged on both sides of the base paper Plastic layers of thermoplastics and one Contains an antistatic layer on one of the plastic layers, being on the not with an antistatic layer provided plastic layer a receiving layer for the Toner image is arranged and the receiving layer is a polymer with an interfacial tension of> 32 mN / m and a film formation temperature according to DIN 53787 of <100 ° C contains.

Als Basispapier kann grundsätzlich jedes Papier verwendet werden, das aus gebleichter Cellulose hergestellt wurde.Basically any paper can be used as base paper be made from bleached cellulose.

Die Basispapiere können Weißpigmente wie Titandioxid oder Calciumcarbonat enthalten, sie können neutral oder alkalisch z.B. mittels reaktiven Leimungsmitteln wie Alkylketendimern oder Derivaten des Dialkylbernsteinsäureanhydrids geleimt sein, sie können sauer geleimt sein, z.B. mit Harzleim (Kopophonium-Harzleim) und Aluminiumsulfat, sie können naßfest ausgerüstet sein, z.B. mit Melamin-Formaldehydharzen oder Polyamidaminepichlorhydrinharzen, und/oder sie können zusätzliche Leimpressenbeschichtungen tragen. Die beidseitig oder einseitig mittels Leimpressen in der Papiermaschine aufgetragenen Beschichtungen dienen beispielsweise der weiteren Verfestigung des Fasergefüges oder geben den Papieroberflächen Eigenschaftsverbesserungen wie höhere Helligkeit durch Zusatz von z.B. optischen Aufhellern oder Antistatik durch Zusatz von z.B. Alkalisalzen oder verbesserte Haftung von später aufzutragenden Schichten. Haftungsverbessernde oder gefügeverfestigende Zusätze sind Polymere wie Stärke, Cellulose-Derivate, Alginate, Polyvinylalkohol, Polyacrylatdispersionen, wasserlösliche Polyacrylsäuren, Styrol-Copolymere und ähnliche Verbindungen. Alle genannten qualitätsverbessernden Zusätze zum Papier sind für die erfindungsgemäße Verwendung jedoch nicht zwingend erforderlich.The base papers can be white pigments such as titanium dioxide or Contain calcium carbonate, they can be neutral or alkaline e.g. using reactive sizing agents such as alkyl ketene dimers or derivatives of dialkyl succinic anhydride they can be acid-glued, e.g. with resin glue (Kopophonium resin glue) and aluminum sulfate, they can be wet-proof be equipped, e.g. with melamine-formaldehyde resins or polyamide aminepichlorohydrin resins, and / or they can wear additional size press coatings. The bilateral or applied on one side using size presses in the paper machine Coatings serve, for example, for further Consolidation of the fiber structure or give the paper surfaces Property improvements such as higher brightness Addition of e.g. optical brighteners or antistatic Addition of e.g. Alkali salts or improved adhesion of layers to be applied later. Liability improvers or Structure-strengthening additives are polymers such as starch, cellulose derivatives, Alginates, polyvinyl alcohol, polyacrylate dispersions, water-soluble polyacrylic acids, styrene copolymers and similar connections. All the above-mentioned quality-improving additives to paper are but not absolutely necessary for the use according to the invention.

Das oben beschriebene Basispapier ist auf beiden Seiten mit thermoplastischen Kunststoffschichten versehen. Diese Thermoplasten, die vorzugsweise durch eine Schmelzextrusionsbeschichtung aufgetragen werden, sind vorzugsweise Polyolefine wie Polyethylen, Polypropylen oder Olefin-Copolymere, z.B. aufgebaut aus Ethylen mit anderen α-Olefinen oder mit Vinylacetat oder mit (Meth)acrylsäureestern. The base paper described above is on both sides with provided thermoplastic layers. These thermoplastics, preferably by a melt extrusion coating are preferably polyolefins such as polyethylene, polypropylene or olefin copolymers, e.g. built up from ethylene with other α-olefins or with vinyl acetate or with (meth) acrylic acid esters.

Unter Polyethylen wird LDPE (Polyethylen niedriger Dichte), HDPE (Polyethylen hoher Dichte) und LLDPE (lineares Polyethylen niedriger Dichte) verstanden. Als erfindungsgemäße Thermoplaste sind jedoch auch Polystyrol, Polycarbonat, Polyvinyl- und Polyacrylverbindungen und Polyurethane geeignet.Under polyethylene is LDPE (low density polyethylene), HDPE (high density polyethylene) and LLDPE (linear polyethylene low density) understood. As the invention However, thermoplastics are also polystyrene, polycarbonate, Suitable for polyvinyl and polyacrylic compounds and polyurethanes.

Das Auftragsgewicht der Kunststoffbeschichtungen ist auf beiden Seiten des Basispapiers annähernd gleich, wenn auch die Thermoplaste gleich sind. Das garantiert eine gute Planlage des Endproduktes. Bei unterschiedlichen Thermoplasten auf Vorder- und Rückseite müssen die unterschiedlichen Zugspannungen durch angepaßtes unterschiedliches Auftragsgewicht ausgeglichen werden.The application weight of the plastic coatings is on both Sides of the base paper approximately the same, although the Thermoplastics are the same. This guarantees good flatness of the end product. With different thermoplastics The front and back must have the different tensile stresses through adjusted different order weight be balanced.

Während die rückseitig aufgebrachte Kunststoffschicht als solche den Ansprüchen genügt, ist die Kunststoffschicht auf der Vorderseite auf gute optische Eigenschaften eingestellt, d.h. sie hat eine hohe Lichtreflexion, hohe Helligkeit und hohe Weiße. Sie kann auch durch Zusatz von Nuancierfarbstoffen ästhetischen oder modischen Farbwünschen angepaßt sein. Hohe Lichtreflexion und hohe Helligkeit werden durch Zumischung von Weißpigmenten, vorzugsweise durch Titandioxid, und optischen Aufhellern erreicht. Die Menge an Weißpigmenten liegt aus verarbeitungstechnischen Gründen üblicherweise zwischen 10 Gew.% und 25 Gew.%, sie kann aber bis zu 50 Gew.% erreichen.While the plastic layer applied on the back as such meets the requirements, the plastic layer is on the front is set for good optical properties, i.e. it has high light reflection, high brightness and high whites. You can also by adding shading dyes be adapted to aesthetic or fashionable color requirements. High light reflection and high brightness are achieved by admixing of white pigments, preferably by titanium dioxide, and optical brighteners achieved. The amount of white pigments is usually between processing reasons 10% by weight and 25% by weight, but it can be up to 50% by weight to reach.

Die Empfangsschicht auf der Vorderseite, die sich auf der Kunststoffschicht befindet, enthält als wesentliche Komponente ein Polymer, das eine gute Haftung des zu übertragenden Tonerbildes gewährleistet. Untersuchungen haben ergeben, daß Polymere mit einer Grenzflächenspannung von > 32 mN/m und einer Filmbildungstemperatur nach DIN 53787 von < 100° C besonders gut geeignet sind. Solche Polymere sind Polystyrole, Polyacrylate, Polyalkylmethacrylate, Ionomere, Polyvinylidenchloride, Celluloseester und Copolymere aus zwei oder mehreren der Monomere Butadien, Styrol, Acrylnitril, Acrylester, Alkylacrylester.The receiving layer on the front, which is on the Plastic layer contains as an essential component a polymer that has good adhesion to the transferred Guaranteed toner image. Studies have shown that Polymers with an interfacial tension of> 32 mN / m and a Film formation temperature according to DIN 53787 of <100 ° C especially are well suited. Such polymers are polystyrenes, Polyacrylates, polyalkyl methacrylates, ionomers, polyvinylidene chlorides, Cellulose esters and copolymers of two or more the monomers butadiene, styrene, acrylonitrile, acrylic esters, Alkyl acrylate.

Zusätzlich können die Empfangsschichten vorteilhaft als Antihaftmittel feinteilige Kieselsäuren wie kolloidale aluminiummodifizierte Kieselsäure enthalten oder Nuancierfarbstoffe, optische Aufheller oder Netzmittel oder Entschäumer. Für die Funktionsfähigkeit des Bildträgermaterials sind diese Zusätze aber nicht erforderlich.In addition, the receiving layers can advantageously be used as non-stick agents finely divided silicas such as colloidal aluminum-modified Contain silica or shading dyes, optical brighteners or wetting agents or defoamers. For the These additives are functional of the image carrier material but not required.

Die Antistatikschicht auf der Rückseite, die sich auf der Kunststoffschicht befindet, enthält in einem Bindemittel als Antistatikum anorganische Salze, vorzugsweise Alkalisalze oder organische Sulfonsäuren oder Carbonsäuren oder deren Alkalisalze oder Metalloxide. Die antistatische Wirkung soll, gemessen als Oberflächenwiderstand der Schicht, Werte zwischen 109 Ω/cm und 1013 Ω/cm besitzen. Zusätzlich kann dieser Antistatikschicht durch Auswahl der Bindemittel und durch weitere Zusatzstoffe eine gute Bedruckbarkeit und Beschreibbarkeit verliehen werden. Für die Bedruckbarkeit mit nichtwäßrigen bzw. unpolaren Druckfarben muß das Bindemittel ebenfalls hydrophoben Charakter aufweisen; es kommen Copolymere aus zwei oder mehreren der Monomere aus Butadien, Styrol, Acrylnitril, Acrylsäureester und Vinylacetat infrage. Für eine Beschreibbarkeit mit Bleistiften werden Kieselsäuren zugesetzt, die den notwendigen Abrieb geben.The antistatic layer on the back, which is located on the plastic layer, contains inorganic salts, preferably alkali salts or organic sulfonic acids or carboxylic acids or their alkali salts or metal oxides, in a binder as an antistatic. The antistatic effect, measured as the surface resistance of the layer, should have values between 10 9 Ω / cm and 10 13 Ω / cm. In addition, this antistatic layer can be given good printability and writeability by the choice of binders and other additives. In order to be printable with non-aqueous or non-polar printing inks, the binder must also have a hydrophobic character; copolymers of two or more of the monomers of butadiene, styrene, acrylonitrile, acrylic acid ester and vinyl acetate are suitable. For writing with pencils, silicas are added, which give the necessary abrasion.

Als Auftragsaggregate für die Empfangsschichten und Antistatikschichten eignen sich alle üblichen Systeme, die über Schöpfwalzen, Rasterwalzen oder Düsen die Beschichtungsmasse direkt oder indirekt an das zu beschichtende Material antragen und es mit Rakeln, Schaber oder Luftbürsten dosieren.As application aggregates for the receiving layers and antistatic layers are all common systems that are about Scoop rollers, anilox rollers or nozzles the coating mass Apply directly or indirectly to the material to be coated and dose it with squeegees, scrapers or air brushes.

Die einzelnen Schichten des erfindungsgemäßen Bildträgermaterials haben folgende Flächengewichtsbereiche: 1 Empfangsschicht 0,1 g/m2 bis 1 g/m2 2 Kunststoffschicht 10 g/m2 bis 50 g/m2 3 Basispapier 60 g/m2 bis 200 g/m2 4 Kunststoffschicht 10 g/m2 bis 50 g/m2 5 Antistatikschicht 0,05 g/m2 bis 2 g/m2 The individual layers of the image carrier material according to the invention have the following basis weight ranges: 1 Receiving layer 0.1 g / m 2 to 1 g / m 2 2 Plastic layer 10 g / m 2 to 50 g / m 2 3rd Base paper 60 g / m 2 to 200 g / m 2 4th Plastic layer 10 g / m 2 to 50 g / m 2 5 Antistatic layer 0.05 g / m 2 to 2 g / m 2

Durch den Aufbau des erfindungsgemäßen Bildträgermaterials werden folgende Eigenschaften erreicht bzw. verbessert:Due to the structure of the image carrier material according to the invention the following properties are achieved or improved:

Die Empfangsschicht zur Aufnahme des Tonerbildes vom Halbleitermaterial besitzt eine gute Temperaturbeständigkeit und hohe Toneraufnahmefähigkeit, so daß auf dem Halbleitermaterial nur noch wenig Resttoner verbleibt. Nach der Fixierung wird eine sehr gute Tonerhaftung erreicht.The receiving layer for receiving the toner image from Semiconductor material has good temperature resistance and high toner absorption, so that on the Semiconductor material only a little residual toner remains. After fixing, there is very good toner adhesion reached.

Die Kunststoffschicht auf der Vorderseite gibt dem späteren Bild eine gute Untergrundweiße und Helligkeit. Sie ebnet die Ungleichmäßigkeiten der Oberfläche des Basispapieres ein und gibt der gesamten Vorderseitenbeschichtung eine gewisse Kompressibilität. Dadurch wird ein verbesserter vollständigerer Kontakt zwischen Transferpapier und Tonerbild auf dem Halbleitermaterial erreicht, wodurch die Tonerübertragung vollständiger ist, keine Fehlstellen (missing dots) im Bild auftreten und die Bildschärfe verbessert ist. The plastic layer on the front gives the later Picture a good background whiteness and brightness. It paves the unevenness of the surface of the base paper and gives the entire front coating certain compressibility. This will make an improved one more complete contact between transfer paper and Toner image reached on the semiconductor material, whereby the toner transfer is more complete, no imperfections (missing dots) occur in the image and the image sharpness is improved.

Das Basispapier ist das generelle Trägermaterial des Bildträgermaterials, es gibt die notwendige Festigkeit und Steifigkeit.The base paper is the general backing material of the Image support material, there is the necessary strength and stiffness.

Die Kunststoffschicht auf der Rückseite gibt dem Verbund eine sehr gute Planlage und dichtet das poröse Basispapier ab, so daß im Kopiergerät zwischen Tonerübertragung und Tonerfixierung das an die Papierführungsstation angelegte Vakuum voll wirksam bleibt und dadurch eine exakte Papierführung, eine optimale Planhaltung des Papiers und ein inniger Kontakt zwischen Bildträgermaterial und Vorheizplatten bzw. Heizwalze garantiert wird.The plastic layer on the back gives the composite a very good flatness and seals the porous base paper from, so that in the copier between toner transfer and toner fixing that to the paper guide station applied vacuum remains fully effective and this ensures exact paper guidance and optimal plan keeping of the paper and an intimate contact between Image carrier material and preheating plates or heating roller is guaranteed.

In Verbindung mit der Kunststoffschicht auf der Vorderseite wird das Basispapier beidseitig abgedichtet. Dadurch bleibt der Feuchtigkeitsgehalt des Basispapiers relativ konstant, auch bei stark schwankender Umgebungsfeuchte. Die Papierfeuchte eines nicht mit Kunststoffen beschichteten Papieres hat einen sehr großen Einfluß auf den elektrischen Oberflächen- und Durchgangswiderstand dieses Papieres, so daß bei schwankender Umgebungsfeuchte auch schwankende Qualität in der Bildübertragung auftreten würde.In conjunction with the plastic layer on the front the base paper is sealed on both sides. This keeps the moisture content of the base paper relatively constant, even with strongly fluctuating ambient humidity. The paper moisture one not with plastics coated paper has a very big impact on the electrical surface and volume resistance this paper so that when the ambient humidity fluctuates also fluctuating quality in image transmission would occur.

Die Antistatikschicht auf der Rückseite verbessert die Stapelfähigkeit des Bildträgermaterials,d.h. das Abnehmen einzelner Papierbogen von einem Stapel und das Auflegen einzelner Papierbogen aufeinander geschieht störungsfrei, weil eine elektrostatische Aufladung vermieden wird. Die antistatische Ausrüstung der Rückseite des Bildträgermaterials darf jedoch nicht zu ausgeprägt sein, da sie sonst Einfluß auf die Tonerübertragung und Tonerhaftung auf der Vorderseite nehmen würde.The antistatic layer on the back improves the Stackability of the image carrier material, i.e. the Removing individual sheets of paper from a stack and that Placing individual sheets of paper on top of each other happens trouble-free because of an electrostatic charge is avoided. The antistatic equipment of the However, the back of the image carrier material must not be pronounced, otherwise they influence the Toner transfer and toner adhesion on the front would take.

Durch die zusätzlich einstellbare Bedruck- und Beschreibbarkeit ist eine Möglichkeit zur Kennzeichnung oder für Informationseintragungen gegeben.Due to the additionally adjustable printing and Writeability is one way of labeling or given for information entries.

Das gesamte derart aufgebaute Bildträgermaterial ermöglicht eine qualitativ hochwertige Bebilderung und besitzt den Charakter eines Fotopapieres.The entire image carrier material thus constructed enables high quality imaging and owns the Character of a photo paper.

Dieser Aufbau ermöglicht außerdem die Erzeugung von Hochglanzbildern durch eine nachträgliche Behandlung des fertigen Bildes durch Druck und Temperatur. Dazu reicht beispielsweise ein Überbügeln oder der Durchlauf über eine Hochglanz-Heizwalze bei etwa 10bar Druck und 180° C Temperatur. Dieser Effekt ist ohne thermoplastische Zwischenschicht nicht möglich.This structure also enables the creation of high-gloss images through a subsequent treatment of the finished Image by pressure and temperature. This is enough, for example ironing or running through a high-gloss heating roller at about 10bar pressure and 180 ° C temperature. This Effect is not possible without a thermoplastic intermediate layer.

Die folgenden Beispiele zeigen derart aufgebaute Bildträgermaterialien.The following examples show image carrier materials constructed in this way.

BeispieleExamples

Eine Mischung aus 70 Gew.% gebleichtem Laubholz-Sulfatzellstoff wurde bei einer Stoffdichte von 4 % bis zu einem Mahlgrad von 35° SR gemahlen.A blend of 70% by weight bleached hardwood sulfate pulp was at a consistency of 4% to a freeness ground from 35 ° SR.

Der Zellstoffsuspension wurden dann die folgenden Leimungsmittel zugesetzt:

  • 0,5 Gew.% kationische Stärke
  • 1,0 Gew.% amphoteres Polyacrylamid
  • 0,6 Gew.% Alkylketendimer
  • 1,0 Gew.% Polyamid-Polyamin-Epichlorhydrinharz
  • 0,1 Gew.% epoxidiertes Fettsäureamid
    • The following sizing agents were then added to the pulp suspension:
  • 0.5% by weight of cationic starch
  • 1.0% by weight of amphoteric polyacrylamide
  • 0.6 wt% alkyl ketene dimer
  • 1.0% by weight polyamide-polyamine-epichlorohydrin resin
  • 0.1% by weight epoxidized fatty acid amide

    • Auf einer Langsiebmaschine mit Glättwerk wurde ein Basispapier von 170 g/m2 erzeugt.A base paper of 170 g / m 2 was produced on a Fourdrinier machine with a smoothing unit.

    Dieses Basispapier wurde in einem Tandemextruder mit den beiden folgenden Kunststoffschichten beschichtet, wobei jeweils nach einer Corona-Vorbehandlung zuerst die Rückseite und danach die Vorderseite beschichtet wurden.This base paper was processed in a tandem extruder the following two plastic layers, where after a corona treatment first the back and then coated the front.

    Rückseitenschicht:

  • 70 Gew.% HDPE (g = 0,950 g/cm3)
  • 30 Gew.% LDPE (g = 0,924 g/cm3)
    • Back layer:
  • 70% by weight HDPE (g = 0.950 g / cm 3 )
  • 30% by weight LDPE (g = 0.924 g / cm 3 )

    • Vorderseitenschicht:

  • 58,0 Gew.% LDPE (g = 0,924 g/cm3)
  • 27,73 Gew.% LLDPE (g = 0.935 g/cm3)
  • 17,73 Gew.% Titandioxid, Rutil
  • 0,2 Gew.% Ultramarinblau
  • 0,2 Gew.% Antioxidans
  • 0,07 Gew.% Metallstearat
  • 0,07 Gew.% Cobaltviolett
    • Front layer:
  • 58.0% by weight LDPE (g = 0.924 g / cm 3 )
  • 27.73% by weight LLDPE (g = 0.935 g / cm 3 )
  • 17.73% by weight titanium dioxide, rutile
  • 0.2% by weight of ultramarine blue
  • 0.2% by weight of antioxidant
  • 0.07% by weight of metal stearate
  • 0.07% by weight cobalt violet

    • Die Extrusionsbeschichtung erfolgte bei 110 m/min. Maschinengeschwindigkeit und Schmelztemperatur von 290°C. Die Auftragsgewichte waren

  • 26 g/m2 für die Rückseitenschicht und
  • 30 g/m2 für die Vorderseitenschicht.
    • The extrusion coating was carried out at 110 m / min. Machine speed and melting temperature of 290 ° C. The order weights were
  • 26 g / m 2 for the back layer and
  • 30 g / m 2 for the front layer.

    • In einer Streichmaschine wurden die folgenden Antistatikschichten und danach die folgenden Empfangsschichten erzeugt, jeweils nach einer vorhergehenden Corona-Vorbehandlung der entsprechenden Kunststoffschicht. Die jeweiligen wäßrigen Beschichtungsmassen wurden mit einer Schöpfwalze an das zu beschichtende Material angetragen, mit einem Rakelstab dosiert und im Heißluftkanal bei 90° C Lufttemperatur getrocknet. Antistatikschicht A1 Gew.%t carboxyliertes Styrol-Acrylester-Copolymer 43,5 carboxyliertes Styrol-Butylacrylat-Copolymer 10,4 Metalloxid, aciculares Titandioxid, oberflächenbehandelt mit Zinnoxid und mit Antimon dotiert 43,5 Netzmittel 1,7 trifunktionelles Aziridin 0,9 Antistatikschicht A2 Gew.% Styrol-Butadien-Copolymer 64,6 Kieselsäure 3-6 µm Teilchengröße 7,8 Kolloidale aluminiummodifizierte Kieselsäure 20,7 Polystyrolsulfonsäure-Natriumsalz 5,2 Netzmittel 1,7 Empfangsschicht E 1 Gew.% carboxyliertes Styrol-Butadien-Copolymer 100 Empfangsschicht E2 Gew.% Acrylsäureester-Vinylacetat-Vinylchlorid-Copolymer 45,4 kolloidale aluminiummodifizierte Kieselsäure 27,3 pyrogene Kieselsäure 27,3 The following antistatic layers and then the following receiving layers were produced in a coating machine, in each case after a previous corona pretreatment of the corresponding plastic layer. The respective aqueous coating compositions were applied to the material to be coated with a scoop roller, metered in with a doctor rod and dried in a hot air duct at an air temperature of 90.degree. Antistatic layer A1 % T carboxylated styrene-acrylic ester copolymer 43.5 carboxylated styrene-butyl acrylate copolymer 10.4 Metal oxide, acicular titanium dioxide, surface treated with tin oxide and doped with antimony 43.5 Wetting agent 1.7 trifunctional aziridine 0.9 Antistatic layer A2 % By weight Styrene-butadiene copolymer 64.6 Silica 3-6 µm particle size 7.8 Colloidal aluminum modified silica 20.7 Polystyrene sulfonic acid sodium salt 5.2 Wetting agent 1.7 Receiving layer E 1 % By weight carboxylated styrene-butadiene copolymer 100 Receive layer E2 % By weight Acrylic acid ester vinyl acetate-vinyl chloride copolymer 45.4 colloidal aluminum modified silica 27.3 fumed silica 27.3

    Das mit den beiden Kunststoffschichten beschichtete Papier wurde mit verschiedenen Kombinationen der Empfangsschichten und Antistatikschichten versehen und führte zu den folgenden Beispielen: Beispiel Antistatikschicht g/m2 Empfangsschicht g/m2 A1 A2 E1 E2 1 0,2 0,4 2 0,2 0,9 3 0,7 0,4 4 0,7 0,9 The paper coated with the two plastic layers was provided with various combinations of the receiving layers and antistatic layers and led to the following examples: example Antistatic layer g / m 2 Receiving layer g / m 2 A1 A2 E1 E2 1 0.2 0.4 2 0.2 0.9 3rd 0.7 0.4 4th 0.7 0.9

    Als Vergleichsbeispiele wurden eingesetzt:

    V1
    das oben beschriebene, beidseitig mit Kunststoffen beschichtete Papier ohne Empfangsschicht und ohne Antistatikschicht.
    V2
    ein handelsübliches "plain paper", d.h. ein Papier, welches für Textkopien verwendet wird.
    The following were used as comparative examples:
    V1
    the paper described above, coated on both sides with plastics, without a receiving layer and without an antistatic layer.
    V2
    a commercially available "plain paper", ie a paper which is used for text copies.

    PrüfmethodenTest methods

    Fotocharakter: Das bebilderte Endprodukt wurde unabhängig von der Bildqualität danach beurteilt, ob es nach dem subjektiven Empfinden beim Betasten bzw. Begreifen bzw. Handhaben der prüfenden Person das Gefühl vermittelt, ein fotografisches Bild in der Hand zu halten. Photo character: The illustrated end product was assessed regardless of the image quality according to whether, after the subjective feeling when touching or grasping or handling, the test person conveyed the feeling of holding a photographic image in his hand.

    Beschreibbarkeit: Mit einem Datumsstempel, einem Kugelschreiber und einem Bleistift der Härte HB wurde die Rückseite des bebilderten Endproduktes gekennzeichnet. Die Beurteilung erfolgte als Mittelwert der drei Einzelergebnisse. Writability: The back of the illustrated end product was marked with a date stamp, a ballpoint pen and a pencil of HB hardness. The assessment was made as the mean of the three individual results.

    Bildschärfe: Das fertige Bild wurde im Vergleich mit dem Original visuell beurteilt. Sharpness: The finished image was assessed visually in comparison with the original.

    Einzug vom Stapel: Der Einzug von Einzelbögen vom Stapel in das Kopiergerät wurde auf Störungen verfolgt.Feeding from the stack: The feeding of single sheets from the stack into the copier was monitored for faults.

    Kratzfestigkeit: Das fertige Bild wurde unter einer Harke durchgezogen, dessen 6 einzelne Zinken unterschiedlich schwere Gewichte (bis maximal 100 g) tragen. Die Ziehgeschwindigkeit war 0,8 cm/s. Scratch resistance: The finished picture was pulled under a rake, the 6 individual tines of which have weights of different weights (up to a maximum of 100 g). The pulling speed was 0.8 cm / s.

    Die Beurteilung aller 5 Prüfmethoden erfolgte nach der Benotung "gut - mittel - schlecht". All 5 test methods were assessed after the grading "good - medium - bad".

    PrüfergebnisseTest results

    FotocharakterPhoto character BeschreibbarkeitWriteability BildschärfeSharpness Einzug v.StapelFeeding from stack Kratzfestig keitScratch-resistant Beispiel1Example 1 gutGood gutGood gutGood gutGood gutGood 22nd gutGood gutGood gutGood gutGood gutGood 33rd gutGood gutGood gutGood gutGood gutGood 44th gutGood gutGood gutGood gutGood gutGood Vergleichcomparison V1V1 mittelmedium schlechtbad mittelmedium schlechtbad schlechtbad V2V2 schlechtbad gutGood schlechtbad gutGood gutGood

    Die guten Ergebnisse der Beispiele 1 bis 4 wurden auch in anderen erfindungsgemäßen Versuchen bestätigt, in denen z.B. eine saure Leimung des Basispapieres, ein zusätzlicher Leimpressenstrich auf dem Basispapier, andere, im Text genannten Thermoplaste oder andere Empfangs- oder Antistatikschichten gewählt wurden.The good results of Examples 1 to 4 were also seen in others Experiments according to the invention confirmed, in which e.g. an acid sizing of the base paper, an additional size press coat on the base paper, others mentioned in the text Thermoplastics or other receiving or antistatic layers were chosen.

    Claims (8)

    1. An image carrier material for electrophotographic processes containing a base paper as core material having applied on both sides of the base paper layers on a thermoplastic resin and an antistatic layer of one of the thermoplastic layers, characterized in that on the resin layer not covered with the antistatic layer, a receiving layer for the toner image is provided and that the receiving layer contains a polymer with a interfacial tension of > 32 mN/m and a film formation temperature according to DIN 53787 of < 100°C.
    2. An image carrier material according to claim 1, characterized in that the polymer of the receiving layer is polystyrene, polyacrylate, polyalkyl (meth)acrylate, ionomer, polyvinylidene chloride, cellulose ester and/or copolymer of two or more of the monomers butadiene, styrene, acrylonitrile, acrylic ester or alkyl acrylic ester.
    3. An image carrier material according to claim 1, characterized in that the receiving layer additionally contains finely divided or colloidal silica.
    4. An image carrier material according to claim 1, characterized in that the thermoplastic materials of the plastic layers are polyolefine, polystyrene, polycarbonate, polyvinyl derivate, polyacrylate, polyurethane and/or copolymer of two or more of the monomers ethylene, propylene, other α-olefins, vinyl acetate or (meth)acrylic acid ester.
    5. An image carrier material according to claim 1, characterized in that the plastic layer which is situated under the receiving layer additionally contains white pigments such as titanium dioxide and/or calcium carbonate, optical brighteners and/or toning dyes, and antioxidants.
    6. An image material according to claim 1, characterized in that the base paper has an additional size press coating.
    7. An image carrier material according to claim 1, characterized in that the antistatic layer contains inorganic salts, alkali salts of organic carboxylic acids or sulfonic acids, or metal oxides.
    8. An image carrier material according to claim 1, characterized in that the antistatic layer additionally contains silicas.
    EP95114077A 1994-09-21 1995-09-08 Electrophotographic image bearing material Expired - Lifetime EP0713151B1 (en)

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    DE4435350A DE4435350C2 (en) 1994-09-21 1994-09-21 Image-receiving material for electrophotographic processes
    DE4435350 1994-09-21

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    EP0713151B1 true EP0713151B1 (en) 2001-06-13

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    Also Published As

    Publication number Publication date
    JPH08211645A (en) 1996-08-20
    US5658677A (en) 1997-08-19
    DE4435350A1 (en) 1996-03-28
    AU688081B2 (en) 1998-03-05
    ATE202219T1 (en) 2001-06-15
    CA2158321C (en) 2006-03-28
    DK0713151T3 (en) 2001-09-17
    ES2159590T3 (en) 2001-10-16
    CA2158321A1 (en) 1996-03-22
    EP0713151A1 (en) 1996-05-22
    DE59509336D1 (en) 2001-07-19
    PT713151E (en) 2001-10-31
    RO117950B1 (en) 2002-09-30
    DE4435350C2 (en) 1998-04-23
    AU3061795A (en) 1996-04-04

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