EP1132768B1 - Support - Google Patents

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Publication number
EP1132768B1
EP1132768B1 EP01104230A EP01104230A EP1132768B1 EP 1132768 B1 EP1132768 B1 EP 1132768B1 EP 01104230 A EP01104230 A EP 01104230A EP 01104230 A EP01104230 A EP 01104230A EP 1132768 B1 EP1132768 B1 EP 1132768B1
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EP
European Patent Office
Prior art keywords
layer
polyethylene
weight
polypropylene
base paper
Prior art date
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Expired - Lifetime
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EP01104230A
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German (de)
French (fr)
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EP1132768A1 (en
Inventor
Rainer Steinbeck
Detlef Dr. Wacker
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
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Felix Schoeller Jr Foto und Spezialpapiere GmbH
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Publication of EP1132768A1 publication Critical patent/EP1132768A1/en
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Classifications

    • 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
    • G03C1/775—Photosensitive materials characterised by the base or auxiliary layers the base being of paper
    • G03C1/79—Macromolecular coatings or impregnations therefor, e.g. varnishes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
    • 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.]
    • 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.]

Definitions

  • the invention relates to a substrate for photographic and non-photographic Imaging method with a base paper and at least one arranged on the front of the base paper thermoplastic layer.
  • polyethylene For coating the front of papers for Begroclar is usually polyethylene with a low density (LDPE) used.
  • LDPE low density
  • the advantages This polymer is mainly in the price and in the largely trouble-free processing. That's how it turns out in particular, the extrusion of a film with uniform Thickness unproblematic dar.
  • the with polyethylene coated photo papers can be easily further processing, i. with the photosensitive Douse emulsion layers.
  • a very good adhesion between the gelatine of the photoemulsion and the Coated paper can be made by corona treatment of the PE paper be achieved.
  • Polyethylene coatings show however, compared to coatings with other polymers also a number of disadvantages. At the thermal Processing, the LDPE molecules tend to Cross-linking reactions, what the melt viscosity significantly increases.
  • Polypropylene shows in the thermoplastic processing not these problems. When processing is a observed drastic lowering of the melt viscosity, the by partial breakage of the polymer chains without subsequent crosslinking reactions can be explained. Polypropylene is thus much better suited than LDPE, Unevenness of the paper backing to be coated equalize and thus leads to a visually smoother Surface of the extruded paper.
  • EP 0 880 065 A describes a photocarrier material which characterized by a particularly smooth surface and high Stiffness distinguishes.
  • This carrier material exists from a paper backing and a multilayer film on the front side.
  • the foil is made up of at least three layers together and is biaxially oriented. Polypropylene films are preferably used. through an extruded polyethylene layer Paper underlay and foil joined together.
  • the disadvantage here are the high production costs and the insufficient adhesion of the photographic emulsion. To improve the adhesion must be an additional Adhesive layer are applied.
  • EP 0 880 066 A also describes a photo carrier from a paper pad and a multi-layered Polypropylene film.
  • This foil is made with a polyethylene extrusion coated. This will be an easily accessible Adhesion of the photographic layer, with good surface achieved, the cost compared to a standard photo carrier but again increased. Disadvantages are still the Adhesion problems between polypropylene film and extruded polyethylene layer occur.
  • JP 7 092 607 A describes one with polyethylene Coated photorafic substrate with high gloss and good adhesion.
  • the only polyethylene layer contains as a main component by means of metallocene catalysts produced polyethylene.
  • the ratio Mw / Mn is in this polyethylene greater than 5.
  • the disadvantage is at this paper the tendency to Mottle. An increase in the Stiffness can not be achieved by this substrate be achieved.
  • JP 7 270 969 A describes a photocarrier material which on the front with a polyethylene and a Polypropylene layer can be coated. It will the polypropylene layer is applied as an upper layer. This gives a carrier material with a high Smoothness. However, the adhesion emulsion is at this Execution only insufficient. Also the adhesion between the polymer layers is not satisfactory.
  • US 6 017 686 A describes a photographic Layer support of a raw paper and a Polyolefinaussen für consisting of several Polyethylene layers consists.
  • US 5 888 714 A also describes a photographic backing of a base paper and a polyolefin outer layer with overlying Silver halide.
  • the polyolefin layer is through a metallocene polyethylene layer directly on the base paper connected to the base paper
  • the object of the invention is to provide a Layered support for photographic and non-photographic Bercisungsclar with a film-like, smooth Surface, on the one hand good adhesion of photographic emulsion or the receiving layer and On the other hand good adhesion between the different ones thermoplastic polymer layers with good Mottle behavior, high stiffness and Tear strength at the same time low Production costs enabled.
  • thermoplastic layer at least one on the Base paper arranged polyolefin layer and at least an over the polyolefin layer arranged Polyethylene layer contains, and the polyethylene layer a by means of metallocene catalysts available Polyethylene, wherein the metallocene polyethylene a Ratio Mw / Mn of about ⁇ 3.5.
  • Metallocene polyethylenes are copolymers of ethene with ⁇ -olefins such as butene-1, hexene-1 or octene-1, with the help of produced by metallocene catalysts. These Polyethylenes and their preparation is known.
  • a raw paper On the surface of a raw paper is by means of (Co) extrusion at least one polyolefin layer and applied at least one polyethylene layer.
  • the Polyolefin layer is on the base paper.
  • the polyethylene layer is above the polyolefin layer arranged.
  • the different types of polyethylene such as HDPE, MDPE, LDPE be used.
  • These polyolefins can by means of Ziegler or metallocene catalysts produced be.
  • polypropylene, polybutylene and other polyolefins is possible.
  • the lower layer is a Polypropylene layer.
  • the positive properties of the lower layer like uniform coverage of the base paper and high smoothness with the good adhesion properties of the polyethylene be combined.
  • the coating weight of the polyolefin layer may be 10 and 35 g / m 2 , preferably 15 and 25 g / m 2 .
  • the application weight of the polyethylene layer is 2 to 30 g / m 2 , preferably 10 and 20 g / m 2 .
  • For polypropylene coating all known types of polypropylene are suitable. Propylene homopolymers and / or propylene copolymers can be used. It is also possible to use mixtures of polypropylene with other polyolefins. Particular preference is given to polypropylene types with long chain branches (HMS types).
  • pigments such as titanium dioxide, clay (kaolin), calcium carbonate or zinc oxide may be added. Titanium dioxide may be present in an amount of 0 to 15 wt%, preferably 5 to 12 wt% in the layer in the layer. Titanium dioxide can be used in either the anatase or rutile form.
  • a mixture of standard LDPE (density 0.9-0.936 g / cm 3 ) and an LDPE produced by means of metallocene catalysts is preferably used.
  • metallocene polyethylenes with a ratio Mw / Mn of ⁇ 3.5. In particular, a ratio Mw / Mn of 1.8 to 2.8 is preferred.
  • the proportion of metallocene polyethylene is 10 to 60 wt.%, Preferably 20 to 40 wt.%.
  • Particularly suitable is a metallocene LDPE having a density of 0.70 to 0.90 g / cm 3 .
  • the pigments used in the polypropylene layer may also be added. Titanium dioxide is also preferably used in this layer in an amount of 7 to 20%, in particular in an amount of 10 to 16% by weight, in one of the two aforementioned crystal forms.
  • the back side of the base paper can be coated in the same way as the front side.
  • An extrusion coating with a polyethylene homopolymer and / or copolymer is preferred.
  • the application weight of the backside layer is 5 to 60 g / m 2 , in particular 10 to 40 g / m 2 .
  • the base paper For the production of the base paper, all types of cellulose fibers and synthetic fibers are suitable. It can be used softwood and / or hardwood pulp, which has been digested by alkaline or acidic processes. For sizing, all sizing agents and wet strength agents known in the paper industry are suitable. Suitable pigments are inorganic compounds such as clay (kaolin), calcium carbonate and titanium dioxide.
  • the base paper may contain other auxiliaries such as defoamers, optical brighteners and dyes. It can be produced on Foudrinier or cylinder paper machines.
  • the basis weight of the base paper may be 40 to 300 g / m 2 . To improve the surface properties, the base paper can be treated with a calender or a calender.
  • the inventive coating of the base paper with the thermoplastic polymers can be extrusion or Coextrusion done.
  • the polymer layers be applied sequentially or simultaneously.
  • the Extrusion speed can be between 100 and 500 m / min be.
  • the base paper can be used with other functional layers such as Antistatic layer or printability layer on front and / or back side.
  • the base paper a mixture of 50% by weight of hardwood sulphate pulp and 50% by weight of hardwood sulphite pulp was ground at a consistency of 4% to a freeness of 35 ° SR.
  • the pulp suspension was added as sizing agents corn starch, polyamide / polyamine-epichlorohydrin resin, alkyl ketene dimer, epoxide and fatty acid amide, and from this a 190 g / m 2 heavy base paper was produced.
  • the paper was surface glued and smoothed with a polyvinyl alcohol solution.
  • the raw paper was on the front by means of Coextrusion with a polypropylene as the lower layer and a polyethylene provided as an upper layer.
  • the Layers had the following composition:
  • the raw paper was on the front by means of Coextrusion with a polypropylene as the lower layer and a polyethylene provided as an upper layer.
  • the Layers had the following composition:
  • the raw paper was on the front by means of Coextrusion with a polypropylene as the lower layer and a polyethylene provided as an upper layer.
  • the Layers had the following composition:
  • the raw paper was on the front by means of Coextrusion with a polyethylene as the lower layer and a polyethylene provided as an upper layer.
  • the Layers had the following composition:
  • Affinity® EG 8200 is a metallocene polyethylene with a density of 0.870 g / cm 3 and a melt index of 5.0 g / 10 min, ratio Mw / Mn 2.8.
  • Stamylan® LD 2304 is an LDPE with a density of 0.923 g / cm 3 and a melt index of 4.4 dg / min.
  • PF-6111® is a polypropylene homopolymer with a density of 0.90 g / cm 3 and a melt index of 30 dg / min.
  • the reverse side of the papers coated according to the examples was extrusion coated with a mixture of 50% by weight of an LDPE and 50% by weight of a high density polyethylene (HDPE).
  • the application weight was 25 g / m 2 .
  • a layer of 80 wt.% LDPE, Stamylan® LD 2304 from DSM and 20 wt.% LDPE masterbatch with 50 wt.% Titanium dioxide in rutile form was applied to the base paper by melt extrusion.
  • the application weight was 35 g / m 2 .
  • the surface of the coated support was irradiated with a corona power of 30 KW.
  • the polypropylene from Example 1 was applied to the base paper by coextrusion as the lower layer.
  • As the upper layer a mixture of LDPE and a metallocene polyethylene having a ratio Mw / Mn of 5.7 was applied analogously to JP-7 092 607.
  • the coating weight of the polypropylene layer was 20 g / m 2 , that of the polyethylene layer 15 g / m 2 .
  • the polypropylene from Example 1 was applied at an application weight of 35 g / m 2 by extrusion.
  • the reverse side of the paper coated according to the comparative examples was extrusion-coated with a mixture of 50% by weight of an LDPE and 50% by weight of a high-density polyethylene (HDPE).
  • the application weight was 25 g / m 2 .
  • Adhesion - Examples of Examples 1 to 4 and Comparative Example were coated with a silver bromide photosensitive emulsion. The patterns were exposed to medium gray tone and developed. The wet emulsion was scratched. Then it was rubbed across the damaged area 20 times with a cloth. The peeling of the emulsion was evaluated visually with grades 1 to 6 (no peeling to strong peeling).
  • Comparative Example 4 could not be sufficient Adhesion between polypropylene and polyethylene layer be achieved.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Physics & Mathematics (AREA)
  • Laminated Bodies (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Paper (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Materials For Medical Uses (AREA)

Abstract

In a base for photographic and non-photographic imaging processes with raw paper and a front thermoplastic coating, the paper is coated with polyolefin layer(s) covered by polyethylene layer(s) and at least one layer contains polyethylene obtained using metallocene catalyst.

Description

Die Erfindung betrifft einen Schichtträger für fotografische und nichtfotografische Bebilderungsverfahren mit einem Rohpapier und mindestens einer auf der Vorderseite des Rohpapiers angeordneten thermoplastischen Schicht.The invention relates to a substrate for photographic and non-photographic Imaging method with a base paper and at least one arranged on the front of the base paper thermoplastic layer.

Bekannt ist die Veredelung von Papieren für fotografische und nichtfotografische Bebilderungsverfahren durch flächiges Verbinden mit mindestens einer Polyolefinschicht durch Extrusion, Coextrusion oder Laminierung. Dadurch sollen Aussehen und Eigenschaften des Grundmaterials verbessert werden. Die Beschichtung mit Polyethylen spielt hierbei eine große Rolle.The processing of papers for photographic purposes is known and non-photographic imaging methods planar connection with at least one Polyolefin layer by extrusion, coextrusion or Lamination. This is intended to look and feel of the base material. The coating with polyethylene plays an important role.

Zur Beschichtung der Vorderseite von Papieren für Bebilderungsverfahren wird in der Regel Polyethylen mit einer niedrigen Dichte (LDPE) verwendet. Die Vorteile dieses Polymers liegen hauptsächlich im Preis und in der weitgehend problemlosen Verarbeitung. So stellt sich insbesondere die Extrusion eines Filmes mit gleichmäßiger Dicke unproblematisch dar. Die mit Polyethylen beschichteten Fotopapiere lassen sich problemlos weiterverarbeiten, d.h. mit den lichtempfindlichen Emulsionsschichten begießen. Eine sehr gute Haftung zwischen der Gelatine der Fotoemulsion und dem beschichteten Papier kann durch Coronabehandlung des PE-Papiers erzielt werden. Polyethylenbeschichtungen zeigen gegenüber Beschichtungen mit anderen Polymeren jedoch auch eine Reihe von Nachteilen. Bei der thermischen Verarbeitung neigen die LDPE-Moleküle zu Quervernetzungsreaktionen, was die Schmelzviskosität erheblich steigert. Dieser Mechanismus führt dazu, dass Unebenheiten der zu beschichtenden Papierunterlage, die durch die Faserstruktur resultieren, nur in unzureichendem Maße bei der Extrusionsbeschichtung ausgeglichen werden können. Dadurch kommt es zu einer Verringerung von Glanz und Glätte des beschichteten Papiers. Außerdem kann an den mit fotografischer Emulsion beschichteten und entwickelten Papieren eine Zunahme der Dichteschwankungen bei den mittleren Bildtönen und des sogenannten Mottle, auch Unruhe genannt, beobachtet werden.For coating the front of papers for Bebilderverfahren is usually polyethylene with a low density (LDPE) used. The advantages This polymer is mainly in the price and in the largely trouble-free processing. That's how it turns out in particular, the extrusion of a film with uniform Thickness unproblematic dar. The with polyethylene coated photo papers can be easily further processing, i. with the photosensitive Douse emulsion layers. A very good adhesion between the gelatine of the photoemulsion and the Coated paper can be made by corona treatment of the PE paper be achieved. Polyethylene coatings show however, compared to coatings with other polymers also a number of disadvantages. At the thermal Processing, the LDPE molecules tend to Cross-linking reactions, what the melt viscosity significantly increases. This mechanism causes that Unevenness of the paper backing to be coated, the due to the fiber structure, only in insufficient in extrusion coating can be compensated. This leads to a Reduction of gloss and smoothness of the coated Paper. Also, it can be used with photographic emulsion coated and developed papers an increase in Density fluctuations in the middle picture tones and the so-called mottle, also called restlessness, observed become.

Polypropylen zeigt bei der thermoplastischen Verarbeitung nicht diese Probleme. Bei der Verarbeitung wird eine drastische Senkung der Schmelzviskosität beobachtet, die durch teilweisen Bruch der Polymerketten ohne anschließende Vernetzungsreaktionen zu erklären ist. Polypropylen ist somit deutlich besser als LDPE geeignet, Unebenheiten der zu beschichtenden Papierunterlage zu egalisieren und führt somit zu einer optisch glatteren Oberfläche des extrudierten Papiers.Polypropylene shows in the thermoplastic processing not these problems. When processing is a observed drastic lowering of the melt viscosity, the by partial breakage of the polymer chains without subsequent crosslinking reactions can be explained. Polypropylene is thus much better suited than LDPE, Unevenness of the paper backing to be coated equalize and thus leads to a visually smoother Surface of the extruded paper.

Allerdings treten bei der Beschichtung des Polypropylens und der weiteren Verarbeitung eine Reihe von Problemen auf. Mit Polypropylen läßt sich bei der Extrusionsbeschichtung nur sehr schwierig eine gleichmäßige Schichtdicke des extrudierten Filmes aufbringen, weil die nicht ausreichende Filmstabilität des aus der Düse extrudierten Films der Düse beispielsweise zu Einschnürungen und somit zu erheblichen Auftragsschwankungen im Bereich von mehreren g/m2 führt. Papiere, die mit einem Polypropylen-Homopolymer oder auch mit einem Polypropylen/Polyethylen-Copolymer beschichtet wurden, zeigen beim Auftragen einer fotografischen Emulsion eine drastische Verschlechterung der Haftung der fotografischen Emulsion auf dem Träger. Dieses Problem kann auch durch eine stärkere Coronabehandlung nicht kompensiert werden. Außerdem gehen beim Einsatz von Polypropylen/Polyethylen-Copolymeren die Polypropylen spezifischen Eigenschaften zum Teil verloren.However, there are a number of problems with the coating of polypropylene and further processing. With polypropylene, it is very difficult to apply a uniform layer thickness of the extruded film in the extrusion coating because the insufficient film stability of the nozzle extruded film of the nozzle leads, for example, to constrictions and thus to considerable fluctuations in the order of several g / m 2 . Papers coated with a polypropylene homopolymer or also with a polypropylene / polyethylene copolymer exhibit a dramatic deterioration in the adhesion of the photographic emulsion to the support when a photographic emulsion is applied. This problem can not be compensated by a stronger corona treatment. In addition, the use of polypropylene / polyethylene copolymers, the polypropylene specific properties are partially lost.

Die EP 0 880 065 A beschreibt ein Fototrägermaterial, das sich durch eine besonders glatte Oberfläche und hoher Steifigkeit auszeichnet. Dieses Trägermaterial besteht aus einer Papierunterlage und einer mehrschichtigen Folie auf der Vorderseite. Die Folie setzt sich aus mindestens drei Schichten zusammen und ist biaxial orientiert. Bevorzugt werden Polypropylen Folien eingesetzt. Mittels einer extrudierten Polyethylenschicht werden Papierunterlage und Folie miteinander verbunden. Nachteilig sind hierbei die hohen Produktionskosten und die unzureichende Haftung der fotografischen Emulsion. Zur Verbesserung der Haftung muß eine zusätzliche Haftschicht aufgetragen werden.EP 0 880 065 A describes a photocarrier material which characterized by a particularly smooth surface and high Stiffness distinguishes. This carrier material exists from a paper backing and a multilayer film on the front side. The foil is made up of at least three layers together and is biaxially oriented. Polypropylene films are preferably used. through an extruded polyethylene layer Paper underlay and foil joined together. The disadvantage here are the high production costs and the insufficient adhesion of the photographic emulsion. To improve the adhesion must be an additional Adhesive layer are applied.

Die EP 0 880 066 A beschreibt ebenfalls einen Fototräger aus einer Papierunterlage und einer mehrschichtigen Polypropylenfolie. Diese Folie wird mit einem Polyethylen extrusionsbeschichtet. Dadurch wird eine gut erreichbare Haftung der fotografischen Schicht, bei guter Oberfläche erreicht, die Kosten gegenüber einem Standard-Fototräger aber nochmals erhöht. Nachteilig sind weiterhin die Haftungsprobleme, die zwischen Polypropylenfolie und extrudierter Polyethylenschicht auftreten.EP 0 880 066 A also describes a photo carrier from a paper pad and a multi-layered Polypropylene film. This foil is made with a polyethylene extrusion coated. This will be an easily accessible Adhesion of the photographic layer, with good surface achieved, the cost compared to a standard photo carrier but again increased. Disadvantages are still the Adhesion problems between polypropylene film and extruded polyethylene layer occur.

Die JP 7 092 607 A beschreibt einen mit Polyethylen beschichteten fotorafischen Schichtträger mit hohem Glanz und guter Haftung. Die einzige Polyethylenschicht enthält als Hauptbestandteil ein mittels Metallocen-Katalysatoren hergestelltes Polyethylen. Das Verhältnis Mw/Mn beträgt bei diesem Polyethylen größer 5. Nachteilig ist bei diesem Papier die Neigung zu Mottle. Eine Erhöhung der Steifigkeit kann durch dieses Trägermaterial nicht erreicht werden.JP 7 092 607 A describes one with polyethylene Coated photorafic substrate with high gloss and good adhesion. The only polyethylene layer contains as a main component by means of metallocene catalysts produced polyethylene. The ratio Mw / Mn is in this polyethylene greater than 5. The disadvantage is at this paper the tendency to Mottle. An increase in the Stiffness can not be achieved by this substrate be achieved.

Die JP 7 270 969 A beschreibt ein Fototrägermaterial, das auf der Vorderseite mit einer Polyethylen- und einer Polypropylen-Schicht beschichtet sein kann. Dabei wird die Polypropylen-Schicht als obere Schicht aufgebracht. Man erhält dadurch ein Trägermaterial mit einer hohen Glätte. Allerdings ist die Haftung Emulsion bei dieser Ausführung nur unzureichend. Auch die Haftung zwischen den Polymerschichten ist nicht befriedigend.JP 7 270 969 A describes a photocarrier material which on the front with a polyethylene and a Polypropylene layer can be coated. It will the polypropylene layer is applied as an upper layer. This gives a carrier material with a high Smoothness. However, the adhesion emulsion is at this Execution only insufficient. Also the adhesion between the polymer layers is not satisfactory.

Die US 6 017 686 A beschreibt einen fotografischen Schichtträger aus einem Rohpapier und einer Polyolefinaussenschicht, die aus mehreren Polyethylenschichten besteht. Das Rohpapier und die Polyolefinaussenschicht werden durch eine Metallocen-Polyethylenschicht, die direkt auf dem Rohpapier liegt, miteinander verbunden.US 6 017 686 A describes a photographic Layer support of a raw paper and a Polyolefinaussenschicht consisting of several Polyethylene layers consists. The raw paper and the Polyolefinaussenschicht be through a metallocene polyethylene layer, which lies directly on the base paper, connected with each other.

Die US 5 888 714 A beschreibt ebenfalls einen fotografischen Schichtträger aus einem Rohpapier und einer Polyolefinaussenschicht mit aufliegender Silberhalogenidschicht. Die Polyolefinschicht ist durch eine dem Rohpapier direkt aufliegenden Metallocen-Polyethylenschicht mit dem Rohpapier verbundenUS 5 888 714 A also describes a photographic backing of a base paper and a polyolefin outer layer with overlying Silver halide. The polyolefin layer is through a metallocene polyethylene layer directly on the base paper connected to the base paper

Neben den Oberflächeneigenschaften spielen die Festigkeiten des Trägermaterial eine große Rolle. Bei der Verwendung von Folien oder folienähnlichen Materialien können gute Oberflächen und hohe Steifigkeiten erreicht werden. Eigenschaften wie Weiterreißfestikeit sind im allgemeiner verschlechtert. Bei thermoplastisch beschichteten Papieren mit nur einer Harzschicht sind Festigkeitseigenschaften wie Weiterreißfestigkeit in der Regel gut.In addition to the surface properties play the Strengths of the carrier material a large role. In the Use of films or film-like materials can achieve good surfaces and high rigidity become. Properties such as tear resistance are in the generally worse. For thermoplastic coated papers with only one resin layer Strength properties such as tear strength in the Usually good.

Aufgabe der Erfindung ist die Bereitstellung eines Schichtträgers für fotografische und nichtfotografische Bebilderungsverfahren mit einer folienähnlichen, glatten Oberfläche, der einerseits eine gute Haftung der fotografischen Emulsion oder der Empfangsschicht und andererseits gute Haftung zwischen den unterschiedlichen thermoplastischen Polymerschichten bei gutem Mottleverhalten, hoher Steifigkeit und Weiterreißfestigkeit bei gleichzeitig niedrigen Produktionskosten ermöglicht. The object of the invention is to provide a Layered support for photographic and non-photographic Bebilderungsverfahren with a film-like, smooth Surface, on the one hand good adhesion of photographic emulsion or the receiving layer and On the other hand good adhesion between the different ones thermoplastic polymer layers with good Mottle behavior, high stiffness and Tear strength at the same time low Production costs enabled.

Gelöst wird die Aufgabe durch einen Schichtträger für fotografische und nichtfotografische Bebilderungsverfahren mit einem Rohpapier und einer auf der Vorderseite angeordneten thermoplastischen Schicht, wobei die thermoplastische Schicht mindestens eine auf dem Rohpapier angeordnete Polyolefinschicht und mindestens eine über der Polyolefinschicht angeordnete Polyethylenschicht enthält, und die Polyethylenschicht ein mittels Metallocen-Katalysatoren erhältliches Polyethylen enthält, wobei das Metallocen-Polyethylen ein Verhältnis Mw/Mn von etwa ≤ 3,5 aufweist.The problem is solved by a support for photographic and non-photographic imaging processes with a base paper and one on the Front disposed thermoplastic layer, wherein the thermoplastic layer at least one on the Base paper arranged polyolefin layer and at least an over the polyolefin layer arranged Polyethylene layer contains, and the polyethylene layer a by means of metallocene catalysts available Polyethylene, wherein the metallocene polyethylene a Ratio Mw / Mn of about ≤ 3.5.

Metallocen-Polyethylene sind Copolymere des Ethens mit α-Olefinen wie Buten-1, Hexen-1 oder Octen-1, die mit Hilfe von Metallocen-Katalysatoren hergestellt werden. Diese Polyethylene und deren Herstellung ist bekannt.Metallocene polyethylenes are copolymers of ethene with α-olefins such as butene-1, hexene-1 or octene-1, with the help of produced by metallocene catalysts. These Polyethylenes and their preparation is known.

Auf die Oberfläche eines Rohpapiers wird mittels (Co)Extrusion mindestens eine Polyolefinschicht und mindestens eine Polyethylenschicht aufgetragen. Die Polyolefinschicht befindet sich dabei auf dem Rohpapier. Die Polyethylenschicht ist oberhalb der Polyolefinschicht angeordnet. Für die Polyolefinschicht können die unterschiedlichen Polyethylentypen wie HDPE, MDPE, LDPE verwendet werden. Diese Polyolefine können mittels Ziegler- oder auch Metallocen-Katalysatoren hergestellt sein. Auch die Verwendung von Polypropylen, Polybutylen und anderen Polyolefinen ist möglich.On the surface of a raw paper is by means of (Co) extrusion at least one polyolefin layer and applied at least one polyethylene layer. The Polyolefin layer is on the base paper. The polyethylene layer is above the polyolefin layer arranged. For the polyolefin layer, the different types of polyethylene such as HDPE, MDPE, LDPE be used. These polyolefins can by means of Ziegler or metallocene catalysts produced be. Also the use of polypropylene, polybutylene and other polyolefins is possible.

Vorzugsweise ist die untere Schicht eine Polypropylenschicht. Durch diesen Schichtaufbau können die positiven Eigenschaften der unteren Schicht wie gleichmäßige Abdeckung des Basispapiers und hohe Glätte mit den guten Haftungseigenschaften des Polyethylens kombiniert werden. Preferably, the lower layer is a Polypropylene layer. Through this layer structure can the positive properties of the lower layer like uniform coverage of the base paper and high smoothness with the good adhesion properties of the polyethylene be combined.

Das Auftragsgewicht der Polyolefinschicht kann 10 und 35 g/m2, vorzugsweise 15 und 25 g/m2 betragen. Das Auftragsgewicht der Polyethylenschicht liegt bei 2 bis 30 g/m2, vorzugsweise 10 und 20 g/m2. Für die Polypropylenbeschichtung sind alle bekannten Polypropylen-Typen geeignet. Es können Propylen-Homopolymere und/oder Propylen-Copolymere verwendet werden. Auch Gemische aus Polypropylen mit anderen Polyolefinen können eingesetzt werden. Besonders bevorzugt werden Polypropylen-Typen mit Langkettenverzweigungen (HMS-Typen). Zur Verbesserung von Opazität und Weissgrad können Pigmente wie Titandioxid, Clay (Kaolin), Calciumcarbonat oder Zinkoxid zugegeben werden. Titandioxid kann in einer Menge von 0 bis 15 Gew.%, vorzugsweise 5 bis 12 Gew.% in der Schicht in der Schicht vorliegen. Titandioxid kann sowohl in der Anatas- oder Rutil-Form verwendet werden.The coating weight of the polyolefin layer may be 10 and 35 g / m 2 , preferably 15 and 25 g / m 2 . The application weight of the polyethylene layer is 2 to 30 g / m 2 , preferably 10 and 20 g / m 2 . For polypropylene coating all known types of polypropylene are suitable. Propylene homopolymers and / or propylene copolymers can be used. It is also possible to use mixtures of polypropylene with other polyolefins. Particular preference is given to polypropylene types with long chain branches (HMS types). To improve opacity and whiteness, pigments such as titanium dioxide, clay (kaolin), calcium carbonate or zinc oxide may be added. Titanium dioxide may be present in an amount of 0 to 15 wt%, preferably 5 to 12 wt% in the layer in the layer. Titanium dioxide can be used in either the anatase or rutile form.

Für die Polyethylenbeschichtung wird vorzugsweise eine Mischung aus Standard-LDPE (Dichte 0,9 - 0,936 g/cm3) und einem LDPE, das mittels Metallocen-Katalysatoren hergestellt wurde, eingesetzt. Besonders geeignet sind Metallocen-Polyethylene mit einem Verhältnis Mw/Mn von ≤ 3,5. Insbesondere wird ein Verhältnis Mw/Mn von 1,8 bis 2,8 bevorzugt. Der Anteil von Metallocen-Polyethylen betragt 10 bis 60 Gew.%, vorzugsweise 20 bis 40 Gew.%. Besonders gut geeignet ist ein Metallocen-LDPE mit einer Dichte von 0,70 bis 0,90 g/cm3. Zur Erhöhung von Opazität und Weissgrad können ebenfalls die in der Polypropylen-Schicht verwendeten Pigmente zugegeben werden. Bevorzugt wird auch in dieser Schicht Titandioxid in einer Menge von 7 bis 20 %, insbesondere in einer Menge von 10 bis 16 Gew.%, in einer der beiden zuvor genannten Kristallformen eingesetzt. For the polyethylene coating, a mixture of standard LDPE (density 0.9-0.936 g / cm 3 ) and an LDPE produced by means of metallocene catalysts is preferably used. Particularly suitable are metallocene polyethylenes with a ratio Mw / Mn of ≤ 3.5. In particular, a ratio Mw / Mn of 1.8 to 2.8 is preferred. The proportion of metallocene polyethylene is 10 to 60 wt.%, Preferably 20 to 40 wt.%. Particularly suitable is a metallocene LDPE having a density of 0.70 to 0.90 g / cm 3 . To increase opacity and whiteness, the pigments used in the polypropylene layer may also be added. Titanium dioxide is also preferably used in this layer in an amount of 7 to 20%, in particular in an amount of 10 to 16% by weight, in one of the two aforementioned crystal forms.

Die Rückseite des Rohpapiers kann auf die gleiche Weise wie die Vorderseite beschichtet werden. Bevorzugt wird eine Extusionsbeschichtung mit einem Polyethylenhomo- und/oder Copolymer. Das Auftragsgewicht der Rückseitenschicht beträgt 5 bis 60 g/m2, insbesondere 10 bis 40 g/m2.The back side of the base paper can be coated in the same way as the front side. An extrusion coating with a polyethylene homopolymer and / or copolymer is preferred. The application weight of the backside layer is 5 to 60 g / m 2 , in particular 10 to 40 g / m 2 .

Zur Herstellung des Basispapiers eignen sich alle Sorten von Cellulosefasern sowie synthetische Fasern. Es kann Nadelholz- und/oder Laubholzzellstoff eingesetzt werden, der durch alkalische oder saure Verfahren aufgeschlossen wurde. Zur Leimung eignen sich alle in der Papierindustrie bekannten Leimungsmittel und Naßfestmittel. Als Pigmente eignen sich anorganische Verbindungen wie Clay (Kaolin), Calciumcarbonat und Titandioxid. Das Basispapier kann weitere Hilfsstoffe wie Entschäumer, optische Aufheller und Farbstoffe enthalten. Es kann auf Foudrinier- oder Zylinder-Papiermaschinen hergestellt werden. Das Flächengewicht des Basispapiers kann 40 bis 300 g/m2 betragen. Zur Verbesserung der Oberflächeneigenschaften kann das Basispapier mit einem Glättwerk oder einem Kalander behandelt werden.For the production of the base paper, all types of cellulose fibers and synthetic fibers are suitable. It can be used softwood and / or hardwood pulp, which has been digested by alkaline or acidic processes. For sizing, all sizing agents and wet strength agents known in the paper industry are suitable. Suitable pigments are inorganic compounds such as clay (kaolin), calcium carbonate and titanium dioxide. The base paper may contain other auxiliaries such as defoamers, optical brighteners and dyes. It can be produced on Foudrinier or cylinder paper machines. The basis weight of the base paper may be 40 to 300 g / m 2 . To improve the surface properties, the base paper can be treated with a calender or a calender.

Die erfindungsgemäße Beschichtung des Rohpapiers mit den thermoplastischen Polymeren kann Extrusion oder Coextrusion erfolgen. Dabei können die Polymerschichten nacheinander oder gleichzeitig aufgetragen werden. Die Extrusionsgeschwindigkeit kann zwischen 100 und 500 m/min betragen.The inventive coating of the base paper with the thermoplastic polymers can be extrusion or Coextrusion done. In this case, the polymer layers be applied sequentially or simultaneously. The Extrusion speed can be between 100 and 500 m / min be.

Das Basispapier kann mit weiteren Funktionsschichten wie Antistatikschicht oder Bedruckbarkeitsschicht auf Vorder- und/oder Rückseite versehen werden. The base paper can be used with other functional layers such as Antistatic layer or printability layer on front and / or back side.

Die nachfolgenden Beispiele sollen die Erfindung weiter erläutern.The following examples are intended to further the invention explain.

BEISPIELEEXAMPLES Erzeugung des RohpapiersGeneration of the raw paper

Zur Herstellung des Rohpapiers wurde eine Mischung aus 50 Gew.% Laubholz-Sulfatzellstoff und 50 Gew.% Laubholz-Sulfitzellstoff bei einer Stoffdichte von 4% bis zu einem Mahlgrad von 35° SR gemahlen. Der Zellstoffsuspension wurden als Leimstoffe Maisstärke, Polyamid/Polyamin-Epichlorhydrinharz, Alkylketendimer, Epoxid und Fettsäureamid zugegeben und daraus ein 190 g/m2 schweres Rohpapier gefertigt. Das Papier wurde mit einer Polyvinylalkohollösung oberflächengeleimt und geglättet.To prepare the base paper, a mixture of 50% by weight of hardwood sulphate pulp and 50% by weight of hardwood sulphite pulp was ground at a consistency of 4% to a freeness of 35 ° SR. The pulp suspension was added as sizing agents corn starch, polyamide / polyamine-epichlorohydrin resin, alkyl ketene dimer, epoxide and fatty acid amide, and from this a 190 g / m 2 heavy base paper was produced. The paper was surface glued and smoothed with a polyvinyl alcohol solution.

Beispiel 1example 1

Das Rohpapier wurde auf der Vorderseite mittels Coextrusion mit einem Polypropylen als unterer Schicht und einem Polyethylen als oberer Schicht versehen. Die Schichten hatten folgende Zusammensetzung:The raw paper was on the front by means of Coextrusion with a polypropylene as the lower layer and a polyethylene provided as an upper layer. The Layers had the following composition:

Polypropylenschicht: Polypropylene layer :

  • 80 Gew.% Polypropylen PF-611® von Montel,80% by weight of polypropylene PF-611® from Montel,
  • 20 Gew.% LLDPE-Masterbatch mit 50 Gew.% Titandioxid in Rutil-Form,20% by weight LLDPE masterbatch with 50% by weight titanium dioxide in Rutile form,
  • Auftragsgewicht 20 g/m2.Application weight 20 g / m 2 .

    • Polyethylenschicht: Polyethylene layer :

  • 20 Gew.% Metallocen-Polyethylen, Affinity® EG 8200,20% by weight of metallocene polyethylene, Affinity® EG 8200,
  • 59 Gew.% LDPE, Stamylan® LD 2304,59% by weight LDPE, Stamylan® LD 2304,
  • 21 Gew.% LDPE-Masterbatch mit 50 Gew.% Titandioxid in Anatas-Form,21 wt.% LDPE masterbatch with 50 wt.% Titanium dioxide in Anatase form,
  • Auftragsgewicht 15 g/m2.Application weight 15 g / m 2 .

    • Beispiel 2Example 2

    Das Rohpapier wurde auf der Vorderseite mittels Coextrusion mit einem Polypropylen als unterer Schicht und einem Polyethylen als oberer Schicht versehen. Die Schichten hatten folgende Zusammensetzung:The raw paper was on the front by means of Coextrusion with a polypropylene as the lower layer and a polyethylene provided as an upper layer. The Layers had the following composition:

    Polypropylenschicht: Polypropylene layer :

  • 80 Gew.% Polypropylen PF-611® von Montell,80% by weight of polypropylene PF-611® from Montell,
  • 20 Gew.% LLDPE-Masterbatch mit 50 Gew.% Titandioxid in Rutil-Form,20% by weight LLDPE masterbatch with 50% by weight titanium dioxide in Rutile form,
  • Auftragsgewicht 20 g/m2.Application weight 20 g / m 2 .

    • Polyethylenschicht: Polyethylene layer :

  • 30 Gew.% Metallocen-Polyethylen, Affinity® EG 820030% by weight of metallocene polyethylene, Affinity® EG 8200
  • 50 Gew.% LDPE, Stamylan® LD 2304,50% by weight LDPE, Stamylan® LD 2304,
  • 20 Gew.% LDPE-Masterbatch mit 50 Gew.% Titandioxid in Rutil-Form,20% by weight LDPE masterbatch with 50% by weight titanium dioxide in Rutile form,
  • Auftragsgewicht 15 g/m2.Application weight 15 g / m 2 .

    • Beispiel 3Example 3

    Das Rohpapier wurde auf der Vorderseite mittels Coextrusion mit einem Polypropylen als unterer Schicht und einem Polyethylen als oberer Schicht versehen. Die Schichten hatten folgende Zusammensetzung:The raw paper was on the front by means of Coextrusion with a polypropylene as the lower layer and a polyethylene provided as an upper layer. The Layers had the following composition:

    Polypropylenschicht: Polypropylene layer :

  • 80 Gew.% Polypropylen PF-611® von Montell,80% by weight of polypropylene PF-611® from Montell,
  • 20 Gew.% LLPDE-Masterbatch mit 50 Gew.% Titandioxid in Rutil-Form,20% by weight LLPDE masterbatch with 50% by weight titanium dioxide in Rutile form,
  • Auftragsgewicht 20 g/m2.Application weight 20 g / m 2 .

    • Polyethylenschicht: Polyethylene layer :

  • 60 Gew.% Metallocen-Polyethylen, Affinity® EG 8200, 60% by weight of metallocene polyethylene, Affinity® EG 8200,
  • 20 Gew.% LDPE, Stamylan® LD 2304,20% by weight LDPE, Stamylan® LD 2304,
  • 20 Gew.% LDPE-Masterbatch mit 50 Gew.% Titandioxid in Rutil-Form,20% by weight LDPE masterbatch with 50% by weight titanium dioxide in Rutile form,
  • Auftragsgewicht 15 g/m2.Application weight 15 g / m 2 .

    • Beispiel 4Example 4

    Das Rohpapier wurde auf der Vorderseite mittels Coextrusion mit einem Polyethylen als unterer Schicht und einem Polyethylen als oberer Schicht versehen. Die Schichten hatten folgende Zusammensetzung:The raw paper was on the front by means of Coextrusion with a polyethylene as the lower layer and a polyethylene provided as an upper layer. The Layers had the following composition:

    Untere Polyethylenschicht: Lower polyethylene layer :

  • 80 Gew.% LDPE, Stamylan® LD 32304,80% by weight LDPE, Stamylan® LD 32304,
  • 20 Gew.% LDPE-Masterbatch mit 50 Gew.% Titandioxid in Rutil-Form,20% by weight LDPE masterbatch with 50% by weight titanium dioxide in Rutile form,
  • Auftragsgewicht 20 g/m2.Application weight 20 g / m 2 .

    • Polyethylenschicht: Polyethylene layer :

  • 20 Gew.% Metallocen-Polyethylen, Affinity® EG 8200,20% by weight of metallocene polyethylene, Affinity® EG 8200,
  • 60 Gew.% LDPE, Stamylan® LD 2304,60% by weight LDPE, Stamylan® LD 2304,
  • 20 Gew.% LDPE-Masterbatch mit 50 Gew.% Titandioxid in Rutil-Form,20% by weight LDPE masterbatch with 50% by weight titanium dioxide in Rutile form,
  • Auftragsgewicht 15 g/m2. Application weight 15 g / m 2 .
  • Auftragsgewicht 20 g/m2.Application weight 20 g / m 2 .

    • Affinity® EG 8200 ist ein Metallocen-Polyethylen mit einer Dichte von 0,870 g/cm3 und einem Schmelzindex von 5,0 g/10min, Verhältnis Mw/Mn 2,8.Affinity® EG 8200 is a metallocene polyethylene with a density of 0.870 g / cm 3 and a melt index of 5.0 g / 10 min, ratio Mw / Mn 2.8.

    Stamylan® LD 2304 ist ein LDPE mit einer Dichte von 0,923 g/cm3 und einem Schmelzindex von 4,4 dg/min.Stamylan® LD 2304 is an LDPE with a density of 0.923 g / cm 3 and a melt index of 4.4 dg / min.

    PF-6111® ist ein Polypropylen-Homopolymer mit einer Dichte von 0,90 g/cm3 und einem Schmelzindex von 30 dg/min.PF-6111® is a polypropylene homopolymer with a density of 0.90 g / cm 3 and a melt index of 30 dg / min.

    Die Rückseite der gemäß den Beispielen beschichteten Papiere wurde mit einer Mischung aus 50 Gew.% eines LDPE und 50 Gew.% eines Polyethylens hoher Dichte (HDPE) durch Extrusion beschichtet. Das Auftragsgewicht betrug 25 g/m2.The reverse side of the papers coated according to the examples was extrusion coated with a mixture of 50% by weight of an LDPE and 50% by weight of a high density polyethylene (HDPE). The application weight was 25 g / m 2 .

    Bei allen Polypropylenbeschichtungen betrug der Schmelzdruck 151 Bar und die Schmelztemperatur 305 °C. Bei den Polyethylenbeschichtungen betrug der Schmelzdruck 145 Bar und die Schmelztemperatur 306 °C.For all polypropylene coatings was the Melt pressure 151 bar and the melt temperature 305 ° C. For the polyethylene coatings, the melt pressure was 145 bar and the melting point 306 ° C.

    Vergleichsbeispiel 1Comparative Example 1

    Auf das Rohpapier wurde mittels Schmelzextrusion eine Schicht aus 80 Gew.% LDPE, Stamylan® LD 2304 von DSM und 20 Gew.% LDPE-Masterbatch mit 50 Gew.% Titandioxid in Rutil-Form aufgetragen. Das Auftragsgewicht betrug 35 g/m2. Zur Erzielung einer guten Emulsionshaftung wurde die Oberfläche der beschichteten Träger mit einer Koronaleistung von 30 KW bestrahlt.A layer of 80 wt.% LDPE, Stamylan® LD 2304 from DSM and 20 wt.% LDPE masterbatch with 50 wt.% Titanium dioxide in rutile form was applied to the base paper by melt extrusion. The application weight was 35 g / m 2 . To achieve a good emulsion adhesion, the surface of the coated support was irradiated with a corona power of 30 KW.

    Vergleichsbeispiel 2Comparative Example 2

    Auf das Rohpapier wurden mittels Coextrusion zwei Polyethylenschichten aufgetragen. Das Gesamtauftragsgewicht betrug 35 g/m2. Beide Schichten hatten folgende Zusammensetzung:

  • 80 Gew.% LDPE, Stamylan® 2304 von DSM
  • 20 Gew.% LDPE-Masterbatch mit 50 Gew% Titandioxid in Rutil-Form.
    • Two polyethylene layers were coextruded onto the base paper. The total application weight was 35 g / m 2 . Both layers had the following composition:
  • 80% by weight LDPE, Stamylan® 2304 from DSM
  • 20% by weight LDPE masterbatch with 50% by weight titanium dioxide in rutile form.

    • Vergleichsbeispiel 3Comparative Example 3

    Auf das Rohpapier wurde mittels Coextrusion als untere Schicht das Polypropylen aus Beispiel 1 aufgetragen. Als obere Schicht wurde analog der JP-7 092 607 eine Mischung aus LDPE und einem Metallocen-Polyethylen mit einem Verhältnis Mw/Mn von 5,7 aufgetragen. Das Auftragsgewicht der Polypropylenschicht betrug 20 g/m2, das der Polyethylenschicht 15 g/m2.The polypropylene from Example 1 was applied to the base paper by coextrusion as the lower layer. As the upper layer, a mixture of LDPE and a metallocene polyethylene having a ratio Mw / Mn of 5.7 was applied analogously to JP-7 092 607. The coating weight of the polypropylene layer was 20 g / m 2 , that of the polyethylene layer 15 g / m 2 .

    Vergleichsbeispiel 4Comparative Example 4

    Auf das Rohpapier wurde das Polypropylen aus Beispiel 1 mit einem Auftragsgewicht von 35 g/m2 mittels Extrusion aufgetragen.On the base paper, the polypropylene from Example 1 was applied at an application weight of 35 g / m 2 by extrusion.

    Die Rückseite der gemäß den Vergleichsbeispielen beschichteten Papier wurde mit einer Mischung von 50 Gew.% eines LDPE und 50 Gew.% eines Polyethylens hoher Dichte (HDPE) durch Extrusion beschichtet. Das Auftragsgewicht betrug 25 g/m2.The reverse side of the paper coated according to the comparative examples was extrusion-coated with a mixture of 50% by weight of an LDPE and 50% by weight of a high-density polyethylene (HDPE). The application weight was 25 g / m 2 .

    An den Beispielen 1 bis 4 und dem Vergleichsbeispiel wurden folgende Prüfungen durchgeführt:Examples 1 to 4 and the comparative example the following tests were carried out:

    Glanzmessung - Muster der Beispiele 1 bis 4 und des Vergleichsbeispiels wurden mit einer lichtempfindlichen Silberbromid-Emulsion beschichtet. Die Muster wurden belichtet und zu einem Schwarzblatt entwickelt. An diesen Schwarzblättern wurde der Glanz mit einem Dreiwinkel-Glanzmeßgerät nach DIN 67530 bei einem Winkel von 20° durchgeführt. Gloss measurement - Samples of Examples 1 to 4 and Comparative Example were coated with a silver bromide photosensitive emulsion. The patterns were exposed and developed into a black leaf. On these black leaves, the gloss was carried out with a three-angle gloss meter according to DIN 67530 at an angle of 20 °.

    Mottle - Muster der Beispiele 1 bis 4 und des Vergleichsbeispiels wurden mit einer lichtempfindlichen Silberbromidemulsion beschichtet. Die Muster wurden auf einen mittleren Grauton belichtet und entwickelt. Anhand von Vergleichsmustern wurde der Mottle visuell mit den Noten 1 bis 6 (sehr gut bis mangelhaft) beurteilt Mottle samples of Examples 1 to 4 and Comparative Example were coated with a silver bromide photosensitive emulsion. The patterns were exposed to medium gray tone and developed. Using comparative samples, the mottle was assessed visually with grades 1 to 6 (very good to poor)

    Haftung - Muster der Beispiele 1 bis 4 und des Vergleichsbeispiels wurden mit einer lichtempfindlichen Silberbromidemulsion beschichtet. Die Muster wurden auf einen mittleren Grauton belichtet und entwickelt. Die feuchte Emulsion wurde angeritzt. Anschließend wurde quer über die beschädigte Stelle 20 mal mit einen Tuch gerieben. Das Ablösen der Emulsion wurde visuell mit den Noten 1 bis 6 (kein Ablösen bis starkes flächiges Ablösen) beurteilt. Adhesion - Examples of Examples 1 to 4 and Comparative Example were coated with a silver bromide photosensitive emulsion. The patterns were exposed to medium gray tone and developed. The wet emulsion was scratched. Then it was rubbed across the damaged area 20 times with a cloth. The peeling of the emulsion was evaluated visually with grades 1 to 6 (no peeling to strong peeling).

    Die Ergebnisse der Prüfungen sind in Tabelle 1 dargestellt. Probe Glanz Mottle Haftung Beispiel 1 77,9 1 1 Beispiel 2 78,3 1 1 Beispiel 3 78,2 1 1 Beispiel 4 78,1 1 1 Vergleichsbeispiel 1 73,9 2-3 2 Vergleichsbeispiel 2 74,1 2-3 2 Vergleichsbeispiel 3 74,2 2-3 2 Vergleichsbeispiel 4 78,5 1-2 5 The results of the tests are shown in Table 1. sample shine mottle liability example 1 77.9 1 1 Example 2 78.3 1 1 Example 3 78.2 1 1 Example 4 78.1 1 1 Comparative Example 1 73.9 2-3 2 Comparative Example 2 74.1 2-3 2 Comparative Example 3 74.2 2-3 2 Comparative Example 4 78.5 1-2 5

    Die Ergebnisse der Messungen zeigen, dass sich durch den beschriebenen Schichtaufbau ein Trägermaterial mit hohem Glanz, guten Mottleeigenschaften und guter Haftung der fotografischen Schicht auf der oberen Harzschicht des erfindungsgemäßen Schichtträgers herstellen läßt. Auch die Steifigkeit und Weiterreißfestigkeit konnten verbessert werden.The results of the measurements show that through the described layer structure a carrier material with high Gloss, good mottle properties and good adhesion of the photographic layer on the upper resin layer of the can be prepared according to the invention. Also the rigidity and tear resistance could be improved.

    Bei Vergleichsbeispiel 4 konnte keine ausreichende Haftung zwischen Polpropylen- und Polyethylenschicht erreicht werden.In Comparative Example 4 could not be sufficient Adhesion between polypropylene and polyethylene layer be achieved.

    Claims (7)

    1. Support material for photographic and non-photographic imaging processes with a base paper and a thermoplastic layer arranged on the front side, characterised in that the thermoplastic layer comprises at least one polyolefin layer arranged on the base paper and at least one polyethylene layer arranged over the polyolefin layer and the polyethylene layer comprises a polyethylene obtained by means of metallocene catalysts, whereby the metallocene polyethylene has an Mw/Mn ratio of approximately ≤ 3.5.
    2. Support material according to claim 1, characterised in that the metallocene polyethylene is has a density of 0.70 to 0.90 g/m3.
    3. Support material according any one of claims 1 or 2, characterised in that the proportion of the metallocene polyethylene in one layer is 10 to 60 % by weight based on the weight of the layer.
    4. Support material according to any one of claims 1 to3, characterised in that characterised in that the polyolefin layer contains a polypropylene homopolymer and/or copolymer.
    5. Use of a support material according to any one of claims 1 to 4 as photo base paper.
    6. Use of a support material according to any one of claims 1 to 4 as a carrier for a recording layer for printing according to the ink-jet process.
    7. Use of a support material according to any one of claims 1 to 4 as a carrier for a recording layer for printing by thermal dye tuff diffusion.
    EP01104230A 2000-02-28 2001-02-22 Support Expired - Lifetime EP1132768B1 (en)

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    DE10009247A DE10009247C1 (en) 2000-02-28 2000-02-28 Base for photographic or non-photographic imaging e.g. ink-jet or thermal dye diffusion printing, consists of paper coated with polyolefin and then polyethylene layer, at least one containing metallocene-polyethylene

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    JP4758092B2 (en) * 2004-10-05 2011-08-24 富士フイルム株式会社 Support for image recording material, image recording material, and image recording method
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    DE50106929D1 (en) 2005-09-08
    DE10009247C1 (en) 2001-10-18
    US20010021442A1 (en) 2001-09-13
    JP2001277451A (en) 2001-10-09
    CN100489660C (en) 2009-05-20
    CN1320836A (en) 2001-11-07
    ATE301300T1 (en) 2005-08-15
    EP1132768A1 (en) 2001-09-12

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