EP2010712B1 - Layer support for recording materials - Google Patents

Layer support for recording materials Download PDF

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Publication number
EP2010712B1
EP2010712B1 EP20070727229 EP07727229A EP2010712B1 EP 2010712 B1 EP2010712 B1 EP 2010712B1 EP 20070727229 EP20070727229 EP 20070727229 EP 07727229 A EP07727229 A EP 07727229A EP 2010712 B1 EP2010712 B1 EP 2010712B1
Authority
EP
European Patent Office
Prior art keywords
support material
material according
pulp
pigment
synthetic resin
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.)
Not-in-force
Application number
EP20070727229
Other languages
German (de)
French (fr)
Other versions
EP2010712A1 (en
Inventor
Gisela GÜNZEL
Kerstin Hackmann
Dietmar Bunke
Jörg BÖMERMANN
Mirko Standke
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.)
Schoeller Technocell GmbH and Co KG
Original Assignee
Schoeller Technocell GmbH and Co KG
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
Application filed by Schoeller Technocell GmbH and Co KG filed Critical Schoeller Technocell GmbH and Co KG
Priority to PL07727229T priority Critical patent/PL2010712T3/en
Publication of EP2010712A1 publication Critical patent/EP2010712A1/en
Application granted granted Critical
Publication of EP2010712B1 publication Critical patent/EP2010712B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B41M5/41—Base layers supports or substrates
    • 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
    • B41M5/0035—Uncoated paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/72—Coated paper characterised by the paper substrate
    • 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
    • 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
    • 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
    • G03G7/006—Substrates for image-receiving members; Image-receiving members comprising only one layer
    • G03G7/0073—Organic components thereof
    • 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
    • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
    • B41M5/508—Supports
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • 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
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12444—Embodying fibers interengaged or between layers [e.g., paper, 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
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/253—Cellulosic [e.g., wood, paper, cork, rayon, 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 relates to a support for recording materials and its use as a photographic support and as a support for digital recordings such as ink jet recording method (ink-jet), thermal dye transfer method and color laser method.
  • ink jet recording method ink-jet
  • thermal dye transfer method ink transfer method
  • color laser method color laser method
  • resin-coated base papers for the production of photographic recording materials, resin-coated base papers (supports) are used that must withstand stringent surface conditions and photochemical safety.
  • These resin-coated base papers usually consist of a sized base paper, which is coated on both sides preferably with polyolefin by extrusion.
  • crater-shaped pits so-called pits, are produced on the polymer surface as a function of the coating speed.
  • the air bubbles trapped in fine recesses on the surface of the cooling cylinder can not escape prior to contact with the hot resin, so that the trapped air escapes only after the coating of the paper to form crater-shaped recesses on the polymer surface.
  • These surface defects have a negative effect on the required surface properties, such as gloss and smoothness, which are required by a carrier material and are decisive for image quality out.
  • the EP 0 952 483 B1 describes a photographic support and proposes to apply a kaolin-containing coating to the base paper, the amount of kaolin not exceeding 3.3 g / m 2 .
  • a uniform surface of the support is not only important for photographic recording materials.
  • polyolefin coated papers are used in the production of non-photographic recording materials, for example, ink-jet papers.
  • An uneven or defective surface of the substrate reduces the quality of the recorded image.
  • the paper surface can also be improved by the addition of inorganic fillers into the pulp suspension, as the voids within the fibrous web are filled by the filler particles, resulting in the improvement of paper smoothness and increasing opacity.
  • inorganic fillers into the pulp suspension
  • the introduction of fillers in the pulp to reduce the strength and rigidity of the paper.
  • the retention of the filler is improved by the compression of the paper to a density of 1.05 to 1.20 g / cm 3 .
  • JP 2004-149952 For example, a filled paper provided with a latex-containing pigment coating is used as the carrier material.
  • the latex used in the line is a water-dispersible acrylic latex.
  • the EP 1 146 390 A2 describes a photographic base paper whose base paper contains calcium carbonate in a proportion of 2 to 8% and is coated with a synthetic resin. To improve the strength properties of the base paper, dry strength and wet strength resins have been dispensed with.
  • the fiber length of the cellulose fibers of the base paper is between 0.4 and 0.6 mm.
  • the WO97 / 26140 A1 describes a recording material for the inkjet printing process, wherein on at least one side of the base paper, a surface sizing with a cationic sizing agent and a cationic polymer and / or an ionic aluminum compound to be made and sizing and polymer should have a certain charge equivalent weight.
  • the freeness of the fibers is between 20 and 60 ° SR.
  • the filler content in the paper is preferably at 10 to 20%. This paper is to be achieved in inkjet printing increased color strength and edge sharpness.
  • the EP 1 126 081 A2 describes a support having a pigment coating disposed on the base paper surface or between base paper and a resin layer.
  • the pigment of this stroke has a certain particle size distribution. As a result, a particularly smooth surface is achieved which allows a reduction in the amount of resin in the application of the resin layer to the coated base paper.
  • a layer support for recording layers comprising a base paper, at least one synthetic resin layer arranged on at least one side of the base paper and at least one layer comprising a hydrophilic binder between the base paper and the synthetic resin layer, and wherein the raw paper contains a hardwood pulp having a pulp content of less than 200 microns after grinding of at most 45 wt.% And a mean fiber length of 0.4 to 0.8 mm and a filler content of 10 to 35 wt.%, In particular 10 to 25 wt %, based on the mass of the pulp.
  • base paper is understood to mean an uncoated or surface-sized paper.
  • a base paper can be in addition to pulp fibers, sizing agents such as Alkylkendendimere, fatty acids and / or fatty acid salts, epoxidized fatty acid amides, alkenyl or alkyl succinic anhydride, wet strength agents such as polyamine-polyamide-epichlorohydrin, dry strength agents such as anionic, cationic or amphoteric polyamides, optical brighteners, pigments, dyes, defoamers and may contain other known in the paper industry aids.
  • the base paper can be surface-sized. Examples of suitable sizing agents are polyvinyl alcohol or oxidized starch.
  • the base paper can be produced on a Fourdrinier or a Yankee paper machine (cylinder paper machine).
  • the weight per unit area of the base paper may be 50 to 250 g / m 2 , in particular 80 to 180 g / m 2 .
  • the raw paper can be used in uncompacted or compacted form (smoothed).
  • Particularly suitable are base papers having a density of 0.8 to 1.05 g / cm 3 , in particular 0.95 to 1.02 g / cm 3 .
  • the pulp according to the invention Before pulping, the pulp according to the invention has a fines content ( ⁇ 100 ⁇ m) of at most 15% by weight, in particular 2 to 10% by weight, based on the mass of the pulp.
  • the mean fiber length of the unmilled pulp is 0.6 to 0.85 mm (Kajaani measurement).
  • the pulp has a lignin content of less than 0.05 wt.%, In particular 0.01 to 0.03 wt.%, Based on the mass of the pulp.
  • the pulp of the invention is preferably a eucalyptus pulp having a pulp content of less than 200 microns after grinding of 10 to 35 wt.% And a mean fiber length of 0.5 to 0.75 mm. It has been found that the use of a pulp with a limited proportion of fibers smaller than 200 microns reduces the loss of stiffness occurring when using filler.
  • the commonly used hardwood pulp NBHK Northern Bleached Hardwood Kraft Pulp
  • NBHK Northern Bleached Hardwood Kraft Pulp
  • the pulp content is less than 200 microns after grinding in a maple pulp at about 60 wt.%, Based on the mass of the pulp.
  • the lignin content of this pulp is 0.18% by weight, based on the mass of the pulp.
  • kaolins calcium carbonate in its natural form, such as limestone, marble or dolomite stone, precipitated calcium carbonate, calcium sulfate, barium sulfate, titanium dioxide, talc, silica, alumina and mixtures thereof can be used in the base paper.
  • Particularly suitable is calcium carbonate with a particle size distribution in which at least 60% of the particles smaller than 2 microns and at most 40% are smaller than 1 micron.
  • calcite is used with a particle size distribution in which about 25% of the particles have a particle size of less than 1 micron and about 85% of the particles have a particle size of less than 2 microns.
  • a calcium carbonate having a particle size distribution can be used in which at least 70%, preferably at least 80%, of the particles are smaller than 2 ⁇ m and at most 70% of the particles are smaller than 1 ⁇ m.
  • the resin layer disposed on at least one side of the base paper may preferably contain a thermoplastic polymer.
  • a thermoplastic polymer Particularly suitable for this purpose are polyolefins, for example low density polyethylene (LDPE), high density polyethylene (HDPE), ethylene / ⁇ -olefin copolymers (LLDPE), polypropylene and blends thereof.
  • the synthetic resin layer may contain white pigments such as titanium dioxide as well as other auxiliaries such as optical brighteners, dyes and dispersing agents.
  • the application weight of the synthetic resin layer on the front side can be 5 to 50 g / m 2 , in particular 10 to 30 g / m 2 or according to a further preferred embodiment 10 to 20 g / m 2 .
  • the synthetic resin layer can be extruded in one layer or coextruded in a multilayered manner.
  • the extrusion coating can be carried out at machine speeds up to 600 m / min.
  • the back side of the base paper can be coated with a clear, ie pigment-free, polyolefin, in particular polyethylene.
  • the coating weight of the synthetic resin layer may be 5 to 50 g / m 2 , in particular 10 to 40 g / m 2 or according to another preferred embodiment 10 to 20 g / m 2 .
  • the back side of the support may also have further functional layers such as antistatic or anticurl layers.
  • the synthetic resin layer may be a polymer film or biaxially oriented polymer film.
  • Particularly suitable are polyethylene or polypropylene films with a porous core layer and at least one unpigmented or white pigmented pore-free surface layer arranged on at least one side of the core layer.
  • the polymer film can be laminated onto the raw paper in an extrusion process, wherein at the same time an adhesion promoter, for example polyethylene, can be used.
  • a further layer containing a hydrophilic binder is disposed between the base paper and the synthetic resin layer.
  • film-forming starches such as thermally modified starches, in particular corn starches or hydroxypropylated starches.
  • low-viscosity starch solutions are used, the Brookfield viscosities ranging from 50 to 600 mPas (25% sol. 50 ° C./100 rpm), in particular 100 to 400 mPas, preferably 200 to 300 mPas, lie.
  • the Brookfield viscosity is measured according to ISO 2555.
  • the binder does not contain a synthetic latex. The absence of a synthetic binder allows the recycling of waste material without prior treatment.
  • the layer containing a hydrophilic binder may preferably contain other polymers such as polyamide copolymers and / or polyvinylamine copolymers.
  • the polymer can be used in an amount of from 0.4 to 5% by weight, based on the mass of the pigment. In a preferred embodiment, the amount of this polymer is 0.5 to 1.5% by weight.
  • the layer containing the hydrophilic binder may be disposed directly on the front side of the base paper or on the back side of the base paper. It can be applied as a single layer or as a multilayer to the base paper.
  • the coating composition can be applied in-line or off-line with all customary in papermaking application units, the amount is chosen so that after drying the coating weight per layer at most 20 g / m 2 , in particular 8 to 17 g / m 2 , or according to a particularly preferred embodiment is 2 to 6 g / m 2 .
  • the layer may preferably contain a pigment.
  • the pigment can be selected from a group of metal oxides, silicates, carbonates, sulfides and sulfates. Particularly suitable are pigments such as kaolins, talc, calcium carbonate and / or barium sulfate. Particularly preferred is a pigment having a narrow particle size distribution, wherein at least 70% of the pigment particles have a size of less than 1 micron.
  • the proportion of the pigment with the narrow particle size distribution of the total amount of pigment should be at least 5% by weight, in particular from 10 to 90% by weight. Particularly good results can be achieved with a proportion of 30 to 80% by weight of the total pigment.
  • a pigment having a narrow particle size distribution is also understood to mean pigments having a particle size distribution in which at least 70% by weight of the pigment particles have a size of less than 1 ⁇ m and 40 to 80% by weight of these pigment particles the difference between the pigment and the pigment largest grain size (diameter) and the pigment of the smallest grain size is smaller than about 0.4 ⁇ m.
  • Particularly advantageous proved to be a calcium carbonate with a d 50% value of about 0.7 microns.
  • a pigment mixture which consists of the above-mentioned calcium carbonate and kaolin.
  • the quantitative ratio calcium carbonate / kaolin is preferably 30:70 to 70:30. It was surprisingly found that, despite the high proportion of yellowing prone kaolin, only an insignificant negative effect on the whiteness of the coated material was observed.
  • the amount ratio of binder / pigment in the layer can be from 0.1 to 2.5, preferably from 0.2 to 1.5, but in particular from 0.9 to 1.3.
  • the solids content of the coating composition of the invention may be from 15 to 35% by weight, based on the weight of the coating composition.
  • these starches form a film on the surface of the base paper.
  • This film prevents the pigment particles of the coating composition from sinking into the recesses of the paper surface. Binder and pigment thus remain on the surface of the Base paper. As a result, less pigment is required to bring about a certain smoothness on the paper.
  • This binder contributes to the fact that the pigmented papers can be recycled without specks using conventional dissolution methods and can be reused in the circulation of the paper machine as a sorted broke.
  • further functional layers can be applied to the substrate according to the invention, such as silver salt emulsion layers for photographic recording materials, recording layers for an inkjet printing process or receiving layers for other imaging techniques such as dye transfer thermal transfer or color laser processes.
  • a eucalyptus pulp having a pulp content of less than 200 ⁇ m (after milling, 35-38 ° SR) of 30% by weight, based on the total pulp, was used.
  • the pulp was ground as a 5% aqueous suspension (thick matter) with the aid of a refiner to a freeness of 35 to 38 ° SR.
  • the concentration of pulp fibers in the thin material was 1% by weight, based on the pulp suspension.
  • Additives are added to the thin material, such as a neutral sizing agent alkyl ketene dimer (AKD), wet strength agent Polyamine Polyamide-epichlorohydrin resin (Kymene ®) and a natural CaCO3 (Hydrocarb ® 60-BG).
  • ALD neutral sizing agent alkyl ketene dimer
  • Kymene ® wet strength agent Polyamine Polyamide-epichlorohydrin resin
  • CaCO3 Hydrocarb ® 60-BG
  • raw papers are 90 ME and Hydrocarb ® HO ME obtainable using the fillers Hydrocarb ® according to the methods described above.
  • the thinness whose pH is adjusted to about 7 to 7.8, is brought from the head box to the wire of the paper machine, followed by sheet formation while dewatering the web in the wire section of the paper machine.
  • the further dewatering of the paper web to a water content of 58 to 72 wt.%, Based on the web weight. Further drying takes place in the dryer section of the paper machine with heated drying cylinders. Further details are summarized in Table 1.
  • a short fiber sulphate pulp was used, which is a mixture of various types of hardwood pulp such as maple, birch, poplar and ash (NBHK).
  • the pulp content less than 200 microns after grinding is 60 wt.%, Based on the mass of the pulp.
  • the base paper was produced with and without filler and also provided with a pigment coating.
  • the papers prepared according to Examples B1 to B5 and Comparative Examples C1 to V3 were coated on the front side with a synthetic resin mixture of 71% by weight of a low-density polyethylene (LDPE, 0.923 g / cm 3 ), 16% by weight of a TiO 2 masterbatch ( 50% by weight LDPE and 50% by weight TiO 2 ) and 13% by weight of further additives such as optical brightener, calcium stearate and blue pigment with different application weights (40 g / m 2 , 30 g / m 2 , 20 g / m 2 ) coated.
  • LDPE low-density polyethylene
  • TiO 2 masterbatch 50% by weight LDPE and 50% by weight TiO 2
  • further additives such as optical brightener, calcium stearate and blue pigment with different application weights (40 g / m 2 , 30 g / m 2 , 20 g / m 2 ) coated.
  • the Coating was carried out at extrusion speeds of 250 to 350 m / min.
  • the stiffness values were determined using a bending stiffness tester SCAN-P 29.69 according to DIN 53121 with a strip width of 38 mm, a clamping length of 10 mm and a bending angle of 15 °. The values are given in mN / 10 mm.
  • the measurements were carried out with a Zeiss Elrepho measuring device according to DIN 53146 on 80x80 mm samples. The evaluation is done via R s / R 8 100 (%). R s means leaf remission over black and R 8 means stack remission.
  • the test is for the objective assessment of paper surfaces with a digital image processing system and constitutes an internal test equipment. Testing is carried out on strips about 20 cm wide over the roll width, which have been conditioned for at least 30 minutes at 23 ° C and 50% relative humidity. The evaluation takes place over the value scale from 100 (excellent) to 1500 (bad).

Abstract

A layer support for recording layers with a base paper comprises a hardwood pulp with a fibre fraction smaller than 200 µm, after grinding, of not more than 45% by weight, with an average fibre length of 0.4 to 0.8 mm, and a filler fraction of 5% to 40%, more particularly 10% to 25%, by weight, based on the mass of the pulp.

Description

Die Erfindung betrifft einen Schichtträger für Aufzeichnungsmaterialien sowie dessen Verwendung als fotografischer Schichtträger und als Schichtträger für digitale Aufzeichnungen wie Tintenstrahl-Aufzeichnungsverfahren (Ink-Jet), thermische Farbstoffübertragungsverfahren und Color-Laser-Verfahren.The invention relates to a support for recording materials and its use as a photographic support and as a support for digital recordings such as ink jet recording method (ink-jet), thermal dye transfer method and color laser method.

Zur Herstellung von fotografischen Aufzeichnungsmaterialien werden harzbeschichtete Basispapiere (Schichtträger) eingesetzt, die strengen Anforderungen hinsichtlich der Oberflächenbeschaffenheit und fotochemischer Unbedenklichkeit standhalten müssen.For the production of photographic recording materials, resin-coated base papers (supports) are used that must withstand stringent surface conditions and photochemical safety.

Diese harzbeschichteten Basispapiere bestehen üblicherweise aus einem geleimten Rohpapier, das beidseitig vorzugsweise mit Polyolefin mittels Extrusion beschichtet ist. Bei der Extrusionsbeschichtung von Papier entstehen an der Polymeroberfläche in Abhängigkeit von der Beschichtungsgeschwindigkeit kraterförmige Störungen, sogenannte Pits. Bei hohen Umdrehungsgeschwindigkeiten des Kühlzylinders können die in feinen Vertiefungen an der Oberfläche des Kühlzylinders eingeschlossenen Luftbläschen vor dem Kontakt mit dem heißen Harz nicht entweichen, so dass die eingeschlossene Luft erst nach dem Beschichten des Papiers unter Bildung kraterförmiger Vertiefungen auf der Polymeroberfläche entweicht. Diese Oberflächenfehler wirken sich negativ auf die von einem Trägermaterial geforderten und für die Bildqualität entscheidenden Oberflächeneigenschaften wie Glanz und Glätte aus. Eine Verbesserung der Oberfläche kann zwar durch die Steigerung der Menge des aufgetragenen Harzes erreicht werden, diese Maßnahme ist jedoch nicht ausreichend bei hohen Extrusionsgeschwindigkeiten und verursacht zudem höhere Materialkosten. Für den Oberflächeneindruck sind jedoch nicht nur Pits, sondern auch Rohpapiereigenschaften wie Oberflächenrauhigkeit/Glätte und die Papierformation (Faserverteilung) entscheidend.These resin-coated base papers usually consist of a sized base paper, which is coated on both sides preferably with polyolefin by extrusion. In the extrusion coating of paper, crater-shaped pits, so-called pits, are produced on the polymer surface as a function of the coating speed. At high rotational speeds of the cooling cylinder, the air bubbles trapped in fine recesses on the surface of the cooling cylinder can not escape prior to contact with the hot resin, so that the trapped air escapes only after the coating of the paper to form crater-shaped recesses on the polymer surface. These surface defects have a negative effect on the required surface properties, such as gloss and smoothness, which are required by a carrier material and are decisive for image quality out. While surface enhancement can be achieved by increasing the amount of resin applied, this approach is not sufficient at high extrusion speeds and also causes higher material costs. However, not only pits, but also base paper properties such as surface roughness / smoothness and paper formation (fiber distribution) are decisive for the surface impression.

Die EP 0 952 483 B1 beschreibt einen fotografischen Schichtträger und schlägt vor, auf das Rohpapier einen Kaolin enthaltenden Strich aufzubringen, wobei die Menge des Kaolins 3,3 g/m2 nicht überschreiten darf. Darüber hinaus wird gefordert, dass die Oberseite des Pigmentstrichs eine mittlere Rauhigkeit Ra von 1,0 µm oder weniger aufweist. Vermutlich entstehen beim Unterschreiten dieses Werts Haftungsprobleme im Hinblick auf die auf den Pigmentstrich aufzubringende Polyolefinschicht.The EP 0 952 483 B1 describes a photographic support and proposes to apply a kaolin-containing coating to the base paper, the amount of kaolin not exceeding 3.3 g / m 2 . In addition, it is required that the top of the pigment stroke has an average roughness Ra of 1.0 μm or less. Adhesion problems probably arise when falling below this value with regard to the polyolefin layer to be applied to the pigment coating.

Eine gleichmäßige Oberfläche des Schichtträgers ist nicht nur für fotografische Aufzeichnungsmaterialien von Bedeutung. Zum Erhalt eines fotoähnlichen Aussehens werden bei der Herstellung nichtfotografischer Aufzeichnungsmaterialien, beispielsweise Ink-Jet-Papiere, mit Polyolefin beschichtete Papiere eingesetzt. Eine ungleichmäßige oder mit Fehlern behaftete Oberfläche des Schichtträgers mindert die Qualität des aufgezeichneten Bildes.A uniform surface of the support is not only important for photographic recording materials. In order to obtain a photo-like appearance, polyolefin coated papers are used in the production of non-photographic recording materials, for example, ink-jet papers. An uneven or defective surface of the substrate reduces the quality of the recorded image.

Die Papieroberfläche kann auch durch die Zugabe anorganischer Füllstoffe in die Zellstoffsuspension verbessert werden, da die Hohlräume innerhalb des Faservlieses durch die Füllstoffpartikel ausgefüllt werden, was zur Verbesserung der Papierglätte und Erhöhung der Opazität führt. Gleichzeitig aber führt das Einbringen von Füllstoffen in die Papiermasse zur Minderung der Festigkeit und der Steifigkeit des Papiers. Diese Eigenschaftsverschlechterungen setzen dem Einsatz von Füllstoffen eine Grenze. Auch bei der Wahl des Füllstoffs sind Grenzen gesetzt, da die Art des Füllstoffs einen Einfluss auf das fotografische Material oder unerwünschte Auswirkungen beim Entwicklungsprozess haben kann. So neigt beispielsweise Calciumcarbonat zum Auswaschen und in Form von Calciumsalzen in der Entwicklungsflüssigkeit auszufällen.The paper surface can also be improved by the addition of inorganic fillers into the pulp suspension, as the voids within the fibrous web are filled by the filler particles, resulting in the improvement of paper smoothness and increasing opacity. At the same time, however, the introduction of fillers in the pulp to reduce the strength and rigidity of the paper. These property deteriorations place a limit on the use of fillers. There are also limits to the choice of filler, as the nature of the filler can have an impact on the photographic material or undesirable effects in the development process. For example, calcium carbonate tends to wash out and precipitate in the form of calcium salts in the developing fluid.

In der EP 1 146 390 A1 wird die Retention des Füllstoffs durch die Verdichtung des Papiers auf eine Dichte von 1,05 bis 1,20 g/cm3 verbessert.In the EP 1 146 390 A1 the retention of the filler is improved by the compression of the paper to a density of 1.05 to 1.20 g / cm 3 .

In JP 2004-149952 wird ein mit einem latexhaltigen Pigmentstrich versehenes gefülltes Papier als Trägermaterial eingesetzt. Der im Strich verwendete Latex ist ein wasserdispergierbarer Acryllatex.In JP 2004-149952 For example, a filled paper provided with a latex-containing pigment coating is used as the carrier material. The latex used in the line is a water-dispersible acrylic latex.

Die EP 1 146 390 A2 beschreibt ein Fotobasispapier, dessen Rohpapier Calciumcarbonat in einem Anteil von 2 bis 8 % enthält und mit einem Kunstharz beschichtet ist. Zur Verbesserung der Festigkeitseigenschaften des Rohpapiers wurde auf Trockenfestigkeit und Nassfestigkeit verleihende Harze verzichtet. Die Faserlänge der Cellulosefasern des Rohpapiers liegt zwischen 0,4 und 0,6 mm.The EP 1 146 390 A2 describes a photographic base paper whose base paper contains calcium carbonate in a proportion of 2 to 8% and is coated with a synthetic resin. To improve the strength properties of the base paper, dry strength and wet strength resins have been dispensed with. The fiber length of the cellulose fibers of the base paper is between 0.4 and 0.6 mm.

Die WO97/26140 A1 beschreibt ein Aufzeichnungsmaterial für das Tintenstrahldruckverfahren, wobei auf mindestens einer Seite des Rohpapiers eine Oberflächenleimung mit einem kationischen Leimungsmittel und einem kationischem Polymer und/oder einer ionischen Aluminiumverbindung vorgenommen werden soll und Leimungsmittel und Polymer ein bestimmtes Ladungsäquivalentgewicht aufweisen sollen. Der Mahlgrad der Fasern liegt zwischen 20 und 60°SR. Der Füllstoffgehalt im Papier liegt vorzugsweise bei 10 bis 20%. Durch dieses Papier soll beim Tintenstrahldruck eine erhöhte Farbstärke und Kantenschärfe erzielt werden.The WO97 / 26140 A1 describes a recording material for the inkjet printing process, wherein on at least one side of the base paper, a surface sizing with a cationic sizing agent and a cationic polymer and / or an ionic aluminum compound to be made and sizing and polymer should have a certain charge equivalent weight. The freeness of the fibers is between 20 and 60 ° SR. The filler content in the paper is preferably at 10 to 20%. This paper is to be achieved in inkjet printing increased color strength and edge sharpness.

Die EP 1 126 081 A2 beschreibt einen Schichtträger mit einem Pigmentstrich, der auf der Rohpapieroberfläche oder zwischen Rohpapier und einer Harzschicht angeordnet ist. Das Pigment dieses Strichs weist eine bestimmte Korngrößenverteilung auf. Dadurch wird eine besonders glatte Oberfläche erzielt die eine Verringerung der Harzmenge beim Aufbringen der Harzschicht auf das gestrichene Rohpapier ermöglicht.The EP 1 126 081 A2 describes a support having a pigment coating disposed on the base paper surface or between base paper and a resin layer. The pigment of this stroke has a certain particle size distribution. As a result, a particularly smooth surface is achieved which allows a reduction in the amount of resin in the application of the resin layer to the coated base paper.

Es ist Aufgabe der Erfindung, einen Schichtträger für Aufzeichnungsmaterialien bereit zu stellen, dessen Oberfläche eine ausreichende hohe Glätte hat, so dass nach der Bildaufzeichnung die Bildqualität durch negative Oberflächeneigenschaften des Schichtträgers nicht beeinträchtigt ist. Insbesondere sollten unter Materialeinsparung nicht nur eine gute Oberfläche sondern auch eine ausreichende Steifigkeit und Festigkeit erzielt werden. Schließlich ist es erwünscht, das Rohpapier derart herzustellen, dass Produktionsabfälle ohne weiteres wieder in den Stoffauflauf der Papiermaschine rezyklisiert werden können, ohne dass zuvor eine aufwendige Aufbereitung des Produktionsabfalls erfolgen muss.It is an object of the invention to provide a support for recording materials whose surface has a sufficiently high smoothness, so that after image recording, the image quality is not affected by negative surface properties of the support. In particular, not only a good surface but also a sufficient rigidity and strength should be achieved with material savings. Finally, it is desirable to produce the base paper in such a way that production waste can easily be recycled back into the headbox of the paper machine without first having to carry out an elaborate treatment of the production waste.

Gelöst wird diese Aufgabe durch einen Schichtträger für Aufzeichnungsschichten mit einem Rohpapier, mindestens einer auf mindestens einer Seite des Rohpapiers angeordneten Kunstharzschicht und mindestens einer ein hydrophiles Bindemittel enthaltenden Schicht zwischen dem Rohpapier und der Kunstharzschicht, und wobei das Rohpapier einen Laubholzzellstoff mit einem Faserstoffanteil kleiner 200 µm nach Mahlung von höchstens 45 Gew.% und einer mittleren Faserlänge von 0,4 bis 0,8 mm enthält und einen Füllstoffanteil von 10 bis 35 Gew.%, insbesondere 10 bis 25 Gew.%, bezogen auf die Masse des Zellstoffs, aufweist.This object is achieved by a layer support for recording layers comprising a base paper, at least one synthetic resin layer arranged on at least one side of the base paper and at least one layer comprising a hydrophilic binder between the base paper and the synthetic resin layer, and wherein the raw paper contains a hardwood pulp having a pulp content of less than 200 microns after grinding of at most 45 wt.% And a mean fiber length of 0.4 to 0.8 mm and a filler content of 10 to 35 wt.%, In particular 10 to 25 wt %, based on the mass of the pulp.

Für die Zwecke der Erfindung versteht man unter dem Begriff Rohpapier ein unbeschichtetes oder oberflächengeleimtes Papier. Ein Rohpapier kann neben Zellstofffasern, Leimungsmittel wie Alkylkentendimere, Fettsäuren und/oder Fettsäuresalze, epoxydierte Fettsäureamide, Alkenyl- oder Alkylbernsteinsäureanhydrid, Nassfestmittel wie Polyamin-Polyamid-Epichlorhydrin, Trockenfestmittel wie anionische, kationische oder amphotere Polyamide, optische Aufheller, Pigmente, Farbstoffe, Entschäumer und weitere in der Papierindustrie bekannte Hilfsmittel enthalten kann. Das Rohpapier kann oberflächengeleimt sein. Hierzu geeignete Leimmittel sind beispielsweise Polyvinylalkohol oder oxydierte Stärke. Das Rohpapier kann auf einer Fourdrinier- oder einer Yankee-Papiermaschine(Zylinder-Papiermaschine) hergestellt werden. Das Flächengewicht des Rohpapiers kann 50 bis 250 g/m2, insbesondere 80 bis 180 g/m2, betragen. Das Rohpapier kann in unverdichteter oder verdichteter Form (geglättet) eingesetzt werden. Besonders gut geeignet sind Rohpapiere mit einer Dichte von 0,8 bis 1,05 g/cm3, insbesondere 0,95 bis 1,02 g/cm3.For the purposes of the invention, the term base paper is understood to mean an uncoated or surface-sized paper. A base paper can be in addition to pulp fibers, sizing agents such as Alkylkendendimere, fatty acids and / or fatty acid salts, epoxidized fatty acid amides, alkenyl or alkyl succinic anhydride, wet strength agents such as polyamine-polyamide-epichlorohydrin, dry strength agents such as anionic, cationic or amphoteric polyamides, optical brighteners, pigments, dyes, defoamers and may contain other known in the paper industry aids. The base paper can be surface-sized. Examples of suitable sizing agents are polyvinyl alcohol or oxidized starch. The base paper can be produced on a Fourdrinier or a Yankee paper machine (cylinder paper machine). The weight per unit area of the base paper may be 50 to 250 g / m 2 , in particular 80 to 180 g / m 2 . The raw paper can be used in uncompacted or compacted form (smoothed). Particularly suitable are base papers having a density of 0.8 to 1.05 g / cm 3 , in particular 0.95 to 1.02 g / cm 3 .

Der erfindungsgemäße Zellstoff weist vor Mahlung einen Feinstoffanteil (< 100 µm) von höchstens 15 Gew.%, insbesondere 2 bis 10 Gew.%, bezogen auf die Masse des Zellstoffs. Die mittlere Faserlänge des ungemahlenen Zellstoffs beträgt 0,6 bis 0,85 mm (Kajaani-Messung). Ferner weist der Zellstoff einen Ligningehalt von weniger als 0,05 Gew.% auf, insbesondere 0,01 bis 0,03 Gew.%, bezogen auf die Masse des Zellstoffs.Before pulping, the pulp according to the invention has a fines content (<100 μm) of at most 15% by weight, in particular 2 to 10% by weight, based on the mass of the pulp. The mean fiber length of the unmilled pulp is 0.6 to 0.85 mm (Kajaani measurement). Furthermore, the pulp has a lignin content of less than 0.05 wt.%, In particular 0.01 to 0.03 wt.%, Based on the mass of the pulp.

Der erfindungsgemäße Zellstoff ist vorzugsweise ein Eukalyptus-Zellstoff mit einem Faserstoffanteil kleiner 200 µm nach Mahlung von 10 bis 35 Gew.% und einer mittleren Faserlänge von 0,5 bis 0,75 mm. Es hat sich gezeigt, dass die Verwendung eines Zellstoffs mit einem limitierten Anteil von Fasern kleiner 200 µm den beim Einsatz von Füllstoff auftretenden Steifigkeitsverlust verringert. Der üblicherweise verwendete Laubholzzellstoff NBHK (Northern Bleached Hardwood Kraft Pulp) zeichnet sich durch einen mindestens um 10 bis 20 Gew.% höheren Feinstoffanteil aus. Beispielsweise liegt der Faserstoffanteil kleiner 200 µm nach Mahlung bei einem Ahornzellstoff bei etwa 60 Gew.%, bezogen auf die Masse des Zellstoffs. Der Ligningehalt liegt bei diesem Zellstoff bei 0,18 Gew.%, bezogen auf die Masse des Zellstoffs.The pulp of the invention is preferably a eucalyptus pulp having a pulp content of less than 200 microns after grinding of 10 to 35 wt.% And a mean fiber length of 0.5 to 0.75 mm. It has been found that the use of a pulp with a limited proportion of fibers smaller than 200 microns reduces the loss of stiffness occurring when using filler. The commonly used hardwood pulp NBHK (Northern Bleached Hardwood Kraft Pulp) is characterized by an at least 10 to 20 wt.% Higher percentage of fines. For example, the pulp content is less than 200 microns after grinding in a maple pulp at about 60 wt.%, Based on the mass of the pulp. The lignin content of this pulp is 0.18% by weight, based on the mass of the pulp.

Als Füllstoff können beispielsweise Kaoline, Calciumcarbonat in seiner natürlichen Form wie Kalkstein, Marmor oder Dolomitstein, gefälltes Calciumcarbonat, Calciumsulfat, Bariumsulfat, Titaniumdioxid, Talkum, Silica, Aluminiumoxid und deren Gemische im Rohpapier eingesetzt werden. Besonders geeignet ist Calciumcarbonat mit einer Korngrößenverteilung, bei der mindestens 60 % der Teilchen kleiner sind als 2 µm und höchstens 40 % kleiner sind als 1 µm. In einer besonderen Ausgestaltung der Erfindung wird Calcit mit einer Korngrößenverteilung eingesetzt, bei der etwa 25 % der Teilchen eine Teilchengröße von weniger als 1 µm und etwa 85 % der Teilchen eine Teilchengröße von weniger als 2 µm aufweisen. Gemäß einer weiteren Ausführungsform der Erfindung kann ein Calciumcarbonat mit einer Korngrößenverteilung eingesetzt werden, bei der mindestens 70 %, vorzugsweise mindestens 80 %, der Teilchen kleiner sind als 2 µm und höchstens 70 % der Teilchen kleiner sind als 1 µm.For example, kaolins, calcium carbonate in its natural form, such as limestone, marble or dolomite stone, precipitated calcium carbonate, calcium sulfate, barium sulfate, titanium dioxide, talc, silica, alumina and mixtures thereof can be used in the base paper. Particularly suitable is calcium carbonate with a particle size distribution in which at least 60% of the particles smaller than 2 microns and at most 40% are smaller than 1 micron. In a particular embodiment of the invention, calcite is used with a particle size distribution in which about 25% of the particles have a particle size of less than 1 micron and about 85% of the particles have a particle size of less than 2 microns. According to a further embodiment of the invention, a calcium carbonate having a particle size distribution can be used in which at least 70%, preferably at least 80%, of the particles are smaller than 2 μm and at most 70% of the particles are smaller than 1 μm.

Die auf mindestens einer Seite des Rohpapiers angeordnete Kunstharzschicht kann vorzugsweise ein thermoplastisches Polymer enthalten. Insbesondere geeignet hierfür sind Polyolefine, beispielsweise Polyethylen niedriger Dichte (LDPE), Polyethylen hoher Dichte (HDPE), Ethylen/α-Olefin-Copolymere (LLDPE), Polypropylen und deren Gemische.The resin layer disposed on at least one side of the base paper may preferably contain a thermoplastic polymer. Particularly suitable for this purpose are polyolefins, for example low density polyethylene (LDPE), high density polyethylene (HDPE), ethylene / α-olefin copolymers (LLDPE), polypropylene and blends thereof.

Die Kunstharzschicht kann Weißpigmente wie Titandioxid sowie weitere Hilfsstoffe wie optische Aufheller, Farbstoffe und Dispergierhilfsmittel enthalten.The synthetic resin layer may contain white pigments such as titanium dioxide as well as other auxiliaries such as optical brighteners, dyes and dispersing agents.

Das Auftragsgewicht der Kunstharzschicht auf der Vorderseite kann 5 bis 50 g/m2 betragen, insbesondere 10 bis 30 g/m2 oder gemäß einer weiteren bevorzugten Ausführungsform 10 bis 20 g/m2. Die Kunstharzschicht kann einschichtig extrudiert oder mehrschichtig coextrudiert werden. Die Extrusionsbeschichtung kann mit Maschinengeschwindigkeiten bis 600 m/min erfolgen.The application weight of the synthetic resin layer on the front side can be 5 to 50 g / m 2 , in particular 10 to 30 g / m 2 or according to a further preferred embodiment 10 to 20 g / m 2 . The synthetic resin layer can be extruded in one layer or coextruded in a multilayered manner. The extrusion coating can be carried out at machine speeds up to 600 m / min.

In einer bevorzugten Ausführungsform der Erfindung kann die Rückseite des Rohpapiers mit einem klaren, d.h. pigmentfreien Polyolefin, insbesondere Polyethylen, beschichtet werden. Das Auftragsgewicht der Kunstharzschicht kann 5 bis 50 g/m2 betragen, insbesondere 10 bis 40 g/m2 oder gemäß einer weiteren bevorzugten Ausführungsform 10 bis 20 g/m2.In a preferred embodiment of the invention, the back side of the base paper can be coated with a clear, ie pigment-free, polyolefin, in particular polyethylene. The coating weight of the synthetic resin layer may be 5 to 50 g / m 2 , in particular 10 to 40 g / m 2 or according to another preferred embodiment 10 to 20 g / m 2 .

Die Rückseite des Schichtträgers kann auch weitere Funktionsschichten wie Antistatik- oder Anticurl-Schichten aufweisen.The back side of the support may also have further functional layers such as antistatic or anticurl layers.

In einer weiteren Ausführungsform der Erfindung kann die Kunstharzschicht eine Polymerfolie oder biaxial orientierte Polymerfolie sein. Besonders gut geeignet sind Polyethylen- oder Polypropylenfolien mit einer porösen Kernschicht und mindestens einer auf mindestens einer Seite der Kernschicht angeordneten unpigmentierten oder weißpigmentierten porenfreien Oberflächenschicht. Die Polymerfolie kann in einem Extrusionsvorgang auf das Rohpapier auflaminiert werden, wobei gleichzeitig ein Haftvermittler, beispielsweise Polyethylen, eingesetzt werden kann.In a further embodiment of the invention, the synthetic resin layer may be a polymer film or biaxially oriented polymer film. Particularly suitable are polyethylene or polypropylene films with a porous core layer and at least one unpigmented or white pigmented pore-free surface layer arranged on at least one side of the core layer. The polymer film can be laminated onto the raw paper in an extrusion process, wherein at the same time an adhesion promoter, for example polyethylene, can be used.

In der Erfindung ist zwischen dem Rohpapier und der Kunstharzschicht eine weitere Schicht angeordnet sein, die ein hydrophiles Bindemittel enthält. Besonders geeignet sind hierzu filmbildende Stärken wie thermisch modifizierte Stärken, insbesondere Maisstärken oder hydroxypropylierte Stärken. In einer bevorzugten Form der Erfindung werden niedrigviskose Stärke-Lösungen eingesetzt, wobei die Brookfield-Viskositäten, in einem Bereich von 50 bis 600 mPas (25%ige Lsg.50°C/100Upm), insbesondere 100 bis 400 mPas, vorzugsweise 200 bis 300 mPas, liegen. Die BrookfieldViskosität wird gemäß ISO 2555 gemessen. Vorzugsweise enthält das Bindemittel keinen synthetischen Latex. Durch das Fehlen eines synthetischen Bindemittels wird die Wiederverwertung von Stoffabfällen ohne vorherige Aufbereitung ermöglicht.In the invention, a further layer containing a hydrophilic binder is disposed between the base paper and the synthetic resin layer. Particularly suitable for this purpose are film-forming starches such as thermally modified starches, in particular corn starches or hydroxypropylated starches. In a preferred form of the invention, low-viscosity starch solutions are used, the Brookfield viscosities ranging from 50 to 600 mPas (25% sol. 50 ° C./100 rpm), in particular 100 to 400 mPas, preferably 200 to 300 mPas, lie. The Brookfield viscosity is measured according to ISO 2555. Preferably, the binder does not contain a synthetic latex. The absence of a synthetic binder allows the recycling of waste material without prior treatment.

Die ein hydrophiles Bindemittel enthaltende Schicht kann vorzugsweise weitere Polymere enthalten wie Polyamidcopolymere und/oder Polyvinylamin-Copolymere. Das Polymer kann in einer Menge von 0,4 bis 5 Gew.%, bezogen auf die Masse des Pigments, eingesetzt werden. Gemäß einer bevorzugten Ausführungsform beträgt die Menge dieses Polymers 0,5 bis 1,5 Gew.%.The layer containing a hydrophilic binder may preferably contain other polymers such as polyamide copolymers and / or polyvinylamine copolymers. The polymer can be used in an amount of from 0.4 to 5% by weight, based on the mass of the pigment. In a preferred embodiment, the amount of this polymer is 0.5 to 1.5% by weight.

Die das hydrophile Bindemittel enthaltende Schicht kann direkt auf der Vorderseite des Rohpapiers oder auf der Rückseite des Rohpapiers angeordnet sein. Sie kann als Einzelschicht oder mehrschichtig auf das Rohpapier aufgetragen werden. Die Beschichtungsmasse kann mit allen in der Papierherstellung üblichen Auftragsaggregaten inline oder offline aufgebracht werden, wobei die Menge so gewählt wird, dass nach dem Trocknen das Auftragsgewicht pro Schicht höchstens 20 g/m2, insbesondere 8 bis 17 g/m2, oder gemäß einer besonders bevorzugten Ausführungsform 2 bis 6 g/m2 beträgt.The layer containing the hydrophilic binder may be disposed directly on the front side of the base paper or on the back side of the base paper. It can be applied as a single layer or as a multilayer to the base paper. The coating composition can be applied in-line or off-line with all customary in papermaking application units, the amount is chosen so that after drying the coating weight per layer at most 20 g / m 2 , in particular 8 to 17 g / m 2 , or according to a particularly preferred embodiment is 2 to 6 g / m 2 .

Die Schicht kann vorzugsweise ein Pigment enthalten. Das Pigment kann aus einer Gruppe der Metalloxide, Silikate, Carbonate, Sulfide und Sulfate ausgewählt werden. Besonders gut geeignet sind Pigmente wie Kaoline, Talkum, Calciumcarbonat und/oder Bariumsulfat. Besonders bevorzugt ist ein Pigment mit einer engen Korngrößenverteilung, bei der mindestens 70 % der Pigmentpartikeln eine Größe von kleiner als 1µm aufweisen. Um den erfindungsgemäßen Effekt zu erreichen, soll der Anteil des Pigments mit der engen Korngrößenverteilung an der gesamten Pigmentmenge mindestens 5 Gew.% betragen, insbesondere 10 bis 90 Gew.%. Besonders gute Ergebnisse sind mit einem Anteil von 30 bis 80 Gew.% des Gesamtpigments zu erreichen. Unter einem Pigment mit einer engen Korngrößenverteilung werden erfindungsgemäß auch Pigmente mit einer Korngrößenverteilung verstanden, bei der mindestens 70 Gew.% der Pigmentpartikel eine Größe von kleiner als 1 µm aufweist und bei 40 bis 80 Gew.% dieser Pigmentpartikeln die Differenz zwischen dem Pigment mit der größten Korngröße (Durchmesser) und dem Pigment der kleinsten Korngröße kleiner als etwa 0,4 µm ist. Als besonders vorteilhaft erwies sich ein Calciumcarbonat mit einem d50%-Wert von etwa 0,7 µm.The layer may preferably contain a pigment. The pigment can be selected from a group of metal oxides, silicates, carbonates, sulfides and sulfates. Particularly suitable are pigments such as kaolins, talc, calcium carbonate and / or barium sulfate. Particularly preferred is a pigment having a narrow particle size distribution, wherein at least 70% of the pigment particles have a size of less than 1 micron. In order to achieve the effect according to the invention, the proportion of the pigment with the narrow particle size distribution of the total amount of pigment should be at least 5% by weight, in particular from 10 to 90% by weight. Particularly good results can be achieved with a proportion of 30 to 80% by weight of the total pigment. According to the invention, a pigment having a narrow particle size distribution is also understood to mean pigments having a particle size distribution in which at least 70% by weight of the pigment particles have a size of less than 1 μm and 40 to 80% by weight of these pigment particles the difference between the pigment and the pigment largest grain size (diameter) and the pigment of the smallest grain size is smaller than about 0.4 μm. Particularly advantageous proved to be a calcium carbonate with a d 50% value of about 0.7 microns.

In einer besonderen Ausführungsform der Erfindung wurde eine Pigmentmischung eingesetzt, die aus dem oben genannten Calciumcarbonat und Kaolin besteht. Das Mengenverhältnis Calciumcarbonat/Kaolin beträgt vorzugsweise 30:70 bis 70:30. Es wurde überraschenderweise festgestellt, dass trotz hohen Anteils des zur Vergilbung neigenden Kaolins nur eine unwesentliche negative Auswirkung auf den Weißgrad des beschichteten Materials zu beobachten war.In a particular embodiment of the invention, a pigment mixture was used which consists of the above-mentioned calcium carbonate and kaolin. The quantitative ratio calcium carbonate / kaolin is preferably 30:70 to 70:30. It was surprisingly found that, despite the high proportion of yellowing prone kaolin, only an insignificant negative effect on the whiteness of the coated material was observed.

Das Mengenverhältnis Bindemittel/Pigment in der Schicht kann 0,1 bis 2,5, vorzugsweise 0,2 bis 1,5, insbesondere jedoch 0,9 bis 1,3 betragen.The amount ratio of binder / pigment in the layer can be from 0.1 to 2.5, preferably from 0.2 to 1.5, but in particular from 0.9 to 1.3.

Der Feststoffgehalt der erfindungsgemäßen Beschichtungsmasse kann 15 bis 35 Gew.%, bezogen auf das Gewicht der Beschichtungsmasse, betragen.The solids content of the coating composition of the invention may be from 15 to 35% by weight, based on the weight of the coating composition.

Es wird angenommen, dass diese Stärken auf der Oberfläche des Rohpapiers einen Film ausbilden. Dieser Film hindert die Pigmentteilchen der Beschichtungsmasse daran, in die Vertiefungen der Papieroberfläche hineinzusinken. Bindemittel und Pigment bleiben somit an der Oberfläche des Rohpapiers. Dadurch ist weniger Pigment erforderlich, um eine gewisse Glätte auf dem Papier herbeizuführen. Dieses Bindemittel trägt dazu bei, dass die pigmentierten Papiere mit herkömmlichen Auflöseverfahren stippenfrei rezykliert und als sortenreiner Ausschuss wieder in den Kreislauf der Papiermaschine eingesetzt werden können.It is believed that these starches form a film on the surface of the base paper. This film prevents the pigment particles of the coating composition from sinking into the recesses of the paper surface. Binder and pigment thus remain on the surface of the Base paper. As a result, less pigment is required to bring about a certain smoothness on the paper. This binder contributes to the fact that the pigmented papers can be recycled without specks using conventional dissolution methods and can be reused in the circulation of the paper machine as a sorted broke.

Je nach gewünschter Verwendung können auf dem erfindungsgemäßen Schichtträger weitere Funktionsschichten aufgetragen werden wie Silbersalzemulsionsschichten für fotografische Aufzeichnungsmaterialien, Aufzeichnungsschichten für ein Tintenstrahl-Druckverfahren oder Empfangsschichten für andere Bebilderungstechniken wie thermische Übertragungsverfahren (Dye Diffusion Thermal Transfer) oder Color-Laser-Verfahren.Depending on the desired use, further functional layers can be applied to the substrate according to the invention, such as silver salt emulsion layers for photographic recording materials, recording layers for an inkjet printing process or receiving layers for other imaging techniques such as dye transfer thermal transfer or color laser processes.

Die folgenden Beispiele sollen die Erfindung näher erläutern.The following examples are intended to explain the invention in more detail.

BeispieleExamples Herstellung der RohpapiereProduction of raw papers

Zur Herstellung der Rohpapiere wurde ein Eukalyptus-Zellstoff mit einem Faserstoffanteil kleiner 200 µm (nach Mahlung, 35-38°SR) von 30 Gew.%, bezogen auf den Gesamtzellstoff, eingesetzt. Zur Mahlung wurde der Zellstoff als etwa 5 %ige wässrige Suspension (Dickstoff) mit Hilfe eines Refiners auf einen Mahlgrad von 35 bis 38 °SR gemahlen. Die Konzentration der Zellstofffasern im Dünnstoff betrug 1 Gew.%, bezogen auf die Zellstoffsuspension. Dem Dünnstoff werden Zusatzstoffe zugesetzt wie ein neutrales Leimungsmittel Alkylketendimner (AKD), Nassfestmittel Polyamin-Polyamid-Epichlorhydrinharz (Kymene®) und ein natürliches CaCO3 (Hydrocarb® 60-BG).To prepare the base papers, a eucalyptus pulp having a pulp content of less than 200 μm (after milling, 35-38 ° SR) of 30% by weight, based on the total pulp, was used. For milling, the pulp was ground as a 5% aqueous suspension (thick matter) with the aid of a refiner to a freeness of 35 to 38 ° SR. The concentration of pulp fibers in the thin material was 1% by weight, based on the pulp suspension. Additives are added to the thin material, such as a neutral sizing agent alkyl ketene dimer (AKD), wet strength agent Polyamine Polyamide-epichlorohydrin resin (Kymene ®) and a natural CaCO3 (Hydrocarb ® 60-BG).

Weitere erfindungsgemäß einsetzbare Rohpapiere sind unter Verwendung der Füllstoffe Hydrocarb® 90 ME und Hydrocarb® HO ME nach dem oben beschriebenen Verfahren erhältlich.Further according to the invention can be used raw papers are 90 ME and Hydrocarb ® HO ME obtainable using the fillers Hydrocarb ® according to the methods described above.

Der Dünnstoff, dessen pH-Wert auf etwa 7 bis 7,8 eingestellt wird, wird vom Stoffauflauf auf das Sieb der Papiermaschine gebracht, worauf die Blattbildung unter Entwässerung der Bahn in der Siebpartie der Papiermaschine erfolgt. In der Pressenpartie erfolgt die weitere Entwässerung der Papierbahn auf einen Wassergehalt von 58 bis 72 Gew.%, bezogen auf das Bahngewicht. Die weitere Trocknung erfolgt in der Trockenpartie der Papiermaschine mit beheizten Trockenzylindern. Weitere Details sind in Tabelle 1 zusammengestellt.The thinness, whose pH is adjusted to about 7 to 7.8, is brought from the head box to the wire of the paper machine, followed by sheet formation while dewatering the web in the wire section of the paper machine. In the press section, the further dewatering of the paper web to a water content of 58 to 72 wt.%, Based on the web weight. Further drying takes place in the dryer section of the paper machine with heated drying cylinders. Further details are summarized in Table 1.

Herstellung der BeschichtungsmassePreparation of the coating composition

Auf das ein Flächengewicht von etwa 160 g/m2 und eine Feuchte von etwa 7 % aufweisende Rohpapier wurden folgende in Tabelle 2 näher spezifizierten Beschichtungsmassen aufgetragen. Die Beschichtung erfolgte mit Hilfe einer Leimpresse.On the base weight of about 160 g / m 2 and a moisture content of about 7% base paper, the following coating compositions specified in more detail in Table 2 were applied. The coating was carried out with the aid of a size press.

In der Beschichtungsmasse wurden folgende Bindemittel eingesetzt:

  • Stärke I: C-Film 05731 (Fa. Cerestar): Hydroxypropylierte Maisstärke/Viskosität 600 mPas, gemessen bei 50°C/100 Upm/Spindel 2 an einer Lösung mit einem Feststoffgehalt von 25 Gew.%.
  • Stärke II: C-Film 07302 (Fa. Cerestar): thermisch modifizierte Stärke/Viskosität 234 mPas, gemessen bei 50°C/100 upm/Spindel 2 an einer Lösung mit einem Feststoffgehalt von 25 Gew.%.
The following binders were used in the coating composition:
  • Starch I: C-Film 05731 (from Cerestar): Hydroxypropylated corn starch / viscosity 600 mPas, measured at 50 ° C./100 rpm / spindle 2 on a solution having a solids content of 25% by weight.
  • Starch II: C-Film 07302 (Cerestar): thermally modified starch / viscosity 234 mPas, measured at 50 ° C / 100 upm / spindle 2 on a solution with a solids content of 25 wt.%.

Die in der Beschichtungsmasse eingesetzten Pigmente sind:

  • CaCO3 mit 85 % Pigmentpartikel < 1µm, (Covercarb® 85-ME, Fa. OMYA)
  • Kaolin mit 65 % Pigment < 1µm, (Lithoprint® EM, Fa. OMYA)
The pigments used in the coating composition are:
  • CaCO 3 with 85% of pigment particles <1 micron, (Covercarb ® 85-ME, OMYA Fa.)
  • Kaolin 65% Pigment <1 micron, (Lithoprint ® EM, Fa. OMYA)

VergleichsbeispieleComparative Examples

Zur Herstellung des Rohpapiers wurde anstelle des Eukalyptus Zellstoffs ein Kurzfaser-Sulfatzellstoff eingesetzt, der ein Gemisch aus diversen Laubholzzellstoffarten wie Ahorn, Birke, Pappel und Esche darstellt (NBHK). Der Faserstoffanteil kleiner 200 µm nach Mahlung beträgt 60 Gew.%, bezogen auf die Masse des Zellstoffs. Das Rohpapier wurde mit und ohne Füllstoff hergestellt und auch mit einem Pigmentstrich versehen.To produce the raw paper, instead of the eucalyptus pulp, a short fiber sulphate pulp was used, which is a mixture of various types of hardwood pulp such as maple, birch, poplar and ash (NBHK). The pulp content less than 200 microns after grinding is 60 wt.%, Based on the mass of the pulp. The base paper was produced with and without filler and also provided with a pigment coating.

Weitere Details sind in Tabelle 1 zusammengestellt.Further details are summarized in Table 1.

Die gemäß den Beispielen B1 bis B5 und Vergleichsbeispielen V1 bis V3 hergestellten Papiere wurden auf der Vorderseite mit einem Kunstharzgemisch aus 71 Gew.% eines Polyethylens niedriger Dichte (LDPE, 0,923 g/cm3), 16 Gew.% eines TiO2-Masterbatches (50 Gew.% LDPE und 50 Gew.% TiO2) und 13 Gew.% weiterer Zusatzstoffe wie optische Aufheller, Ca-Stearat und Blaupigment mit verschiedenen Auftragsgewichten (40 g/m2, 30 g/m2, 20 g/m2) beschichtet. Die Rückseite der Papiere wurde mit einem pigmentfreien Kunstharzgemisch aus 40 Gew. eines Polyethylens niedriger Dichte (LDPE, d=0,923 g/m2) und 60 Gew.% eines Polyethylens hoher Dichte (HDPE, d=0,964 g/cm3) beschichtet. Die Beschichtung erfolgte bei Extrusionsgeschwindigkeiten von 250 bis 350 m/min.The papers prepared according to Examples B1 to B5 and Comparative Examples C1 to V3 were coated on the front side with a synthetic resin mixture of 71% by weight of a low-density polyethylene (LDPE, 0.923 g / cm 3 ), 16% by weight of a TiO 2 masterbatch ( 50% by weight LDPE and 50% by weight TiO 2 ) and 13% by weight of further additives such as optical brightener, calcium stearate and blue pigment with different application weights (40 g / m 2 , 30 g / m 2 , 20 g / m 2 ) coated. The backside of the papers was coated with a pigment-free synthetic resin mixture of 40% by weight of a low density polyethylene (LDPE, d = 0.923 g / m 2 ) and 60% by weight of a high density polyethylene (HDPE, d = 0.964 g / cm 3 ). The Coating was carried out at extrusion speeds of 250 to 350 m / min.

Prüfung der gemäß den Beispielen und den Vergleichsbeispielen hergestellten SchichtträgerExamination of the substrate prepared according to the examples and the comparative examples

Steifigkeitrigidity

Die Steifigkeitswerte wurden mit einem Biegesteifigkeitsprüfer SCAN-P 29.69 gemäß DIN 53121 bei einer Streifenbreite von 38 mm, einer Einspannlänge von 10 mm und einem Biegewinkel von 15°. Die Werte sind in mN/10 mm angegeben.The stiffness values were determined using a bending stiffness tester SCAN-P 29.69 according to DIN 53121 with a strip width of 38 mm, a clamping length of 10 mm and a bending angle of 15 °. The values are given in mN / 10 mm.

Opazitätopacity

Die Messungen wurden mit einem Zeiss-Elrepho-Messgerät gemäß DIN 53146 an Mustern 80x80 mm durchgeführt. Die Auswertung erfolgt über Rs/R8 100 (%). Rs bedeutet Blattremission über Schwarz und R8 bedeutet Stapelremission.The measurements were carried out with a Zeiss Elrepho measuring device according to DIN 53146 on 80x80 mm samples. The evaluation is done via R s / R 8 100 (%). R s means leaf remission over black and R 8 means stack remission.

Spaltfestigkeitcleavage strength

Die Messungen erfolgten mit einem Spaltfestigkeitsprüfer Internal Bond Impact Tester gemäß TAPPI RC 308. Die Werte sind in J/m2 angegeben.The measurements were carried out using a split strength tester Internal Bond Impact Tester according to TAPPI RC 308. The values are given in J / m 2 .

Oberflächesurface

Die Prüfung dient der objektiven Beurteilung von Papieroberflächen mit einem digitalen Bildverarbeitungssystem und stellt ein internes Prüfmittel dar. Geprüft wird an etwa 20 cm breiten Streifen über die Rollenbreite, die mindestens 30 Minuten bei 23°C und 50 % relativer Luftfeuchte klimatisiert wurden. Die Auswertung erfolgt über die Werteskala von 100 (exzellent) bis 1500 (schlecht). Tabelle 1 Eigenschaft / Beispiel Einheit B1 B2 B3 B4 B5 V1 V2 V3 V4 Rohpapier Zellstoff Eukal. Eukal. Eukal. Eukal. Euka l. NBHK NBHK NBHK NBHK Dickstoff Stärke Gew.% 0,57 0,57 0,57 0,57 0,57 0,56 0,57 0,57 0,57 Dünnstoff AKD Gew.% 0,48 0,24 0,40 0,24 0,24 0,24 0, 48 0, 48 0,48 Kymene Gew.% 0,36 0,36 0,36 0,36 0,36 0,36 0,36 0,36 0,36 Aufheller Gew.% 0,06 0,06 0,06 0,06 0.06 0,06 0,06 0,06 0,06 Füllstoff Gew.% 10,00 10,00 13,50 15,70 19,0 0 15,00 - 15,00 - pH Dünnstoff 7,5 7,6 7,6 7,8 7,7 7,7 7.0 7,7 7,0 Mahlgrad/Dick stoff °SR 36 37 38 37 35 33 33 33 33 Faserlänge mm 0,64 0,64 0, 64 0,64 0,64 0,54 0,54 0,54 0,54 Flächengewich t g/m2 160 160 160 160 160 160 160 160 160 Dichte g/cm3 1,02 1,02 1.02 1.02 1,02 1.04 1.04 0,95 0,95 Tabelle 2 Eigenschaft/ Beispiel B1 B2 B3 B4 B5 V1 V2 V3 V4 Bindemittel: Stärke I % - 90,5 - - Stärke II % 90,5 47,0 47,0 - - 47,0 47,0 Pigment: CaCO3 % 26,4 26,4 - - 26,4 26,4 Kaolin % 26,4 26,4 - - 26,4 26,4 Polymer-Additiv: % Acroflex® VX 610 % - 0,5 0,5 0,2 0,2 - 0,2 0,2 Streichmasse: - Feststoffgehalt % 22,0 21,0 21,0 21,0 - - 21,0 21,5 pH-Wert - 8,0 8,0 8,0 8,1 - - 8,1 8,0 Viskositat mPas - 50 50 50,0 50 - - 50 50 Auftragsgewicht g/m2 - 6,0 6,0 6,5 6,0 - - 10 6,0 Tabelle 3 Prüfergebnisse Eigenschaft/ Beispiel B1 B2 B3 B4 B5 V1 V2 V3 V4 Steifigkeit längs 232,7 253,17 242,20 235,9 190,78 215,20 262,14 222,30 282,64 Steifigkeit quer 106,7 123,40 108,99 106,12 99,91 103,30 115,29 106.70 115,29 Spaltfestigkeit 170 182 175 165 155 160 243 168 261 Opazitat 90,0 90,0 91,1 92,8 93,7 90,4 89,3 93,5 94 Oberflache 551 535 510 480 470 520 510 460 470 The test is for the objective assessment of paper surfaces with a digital image processing system and constitutes an internal test equipment. Testing is carried out on strips about 20 cm wide over the roll width, which have been conditioned for at least 30 minutes at 23 ° C and 50% relative humidity. The evaluation takes place over the value scale from 100 (excellent) to 1500 (bad). Table 1 Property / Example unit B1 B2 B3 B4 B5 V1 V2 V3 V4 base paper cellulose Eukal. Eukal. Eukal. Eukal. Euka l. NBHK NBHK NBHK NBHK thick matter Strength Wt.% 0.57 0.57 0.57 0.57 0.57 0.56 0.57 0.57 0.57 thin stock AKD Wt.% 0.48 0.24 0.40 0.24 0.24 0.24 0, 48 0, 48 0.48 Kymene Wt.% 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 brighteners Wt.% 0.06 0.06 0.06 0.06 12:06 0.06 0.06 0.06 0.06 filler Wt.% 10.00 10.00 13.50 15.70 19.0 0 15.00 - 15.00 - pH thin material 7.5 7.6 7.6 7.8 7.7 7.7 7.0 7.7 7.0 Grinding degree / Dick fabric ° SR 36 37 38 37 35 33 33 33 33 fiber length mm 0.64 0.64 0, 64 0.64 0.64 0.54 0.54 0.54 0.54 Basis weight g / m 2 160 160 160 160 160 160 160 160 160 density g / cm 3 1.02 1.02 1:02 1:02 1.02 1:04 1:04 0.95 0.95 Property / Example B1 B2 B3 B4 B5 V1 V2 V3 V4 Binder : Strength I % - 90.5 - - Strength II % 90.5 47.0 47.0 - - 47.0 47.0 Pigment : CaCO 3 % 26.4 26.4 - - 26.4 26.4 kaolin % 26.4 26.4 - - 26.4 26.4 Polymer additive : % Acroflex ® VX 610 % - 0.5 0.5 0.2 0.2 - 0.2 0.2 Coating composition : - Solids content % 22.0 21.0 21.0 21.0 - - 21.0 21.5 PH value - 8.0 8.0 8.0 8.1 - - 8.1 8.0 Viscosity mPas - 50 50 50.0 50 - - 50 50 application weight g / m 2 - 6.0 6.0 6.5 6.0 - - 10 6.0 Property / Example B1 B2 B3 B4 B5 V1 V2 V3 V4 Stiffness along 232.7 253.17 242.20 235.9 190.78 215.20 262.14 222.30 282.64 Stiffness across 106.7 123.40 108.99 106.12 99.91 103.30 115.29 106.70 115.29 cleavage strength 170 182 175 165 155 160 243 168 261 Opacity 90.0 90.0 91.1 92.8 93.7 90.4 89.3 93.5 94 Surface 551 535 510 480 470 520 510 460 470

Claims (18)

  1. A support material for recording layers comprising a raw base paper, at least one synthetic resin layer located on at least one side of the raw paper, at least one binder containing layer between the raw paper and the synthetic resin layer, wherein the raw paper contains a hardwood pulp and a filler fraction of 10 to 35 wt.%, relative to the mass of the pulp and the fibre fraction of the hardwood pulp smaller than 200 µm after refining is at most 45 wt.% and an average fibre length is 0.4 to 0.8 mm.
  2. The support material according to claim 1, characterised in that the pulp is an eucalyptus pulp.
  3. The support material according to claim 2, characterised in that the eucalyptus pulp contains a fibre fraction smaller than 200 µm after refining of 10 to 35 wt.% relative to the mass of the pulp and has a fibre length of 0.5 to 0.75 mm.
  4. The support material according any one of claim 1 to 3, characterised in that the raw paper has a filler fraction of 10 to 25 wt.% based on the mass of the pulp.
  5. The support material according any one of claim 1 to 4, characterised in that the filler is a calcium carbonate, titanium dioxide, talc and/or clay.
  6. The support material according to any one of claim 1 to 5, characterised in that the synthetic resin layer contains a thermoplastic polymer.
  7. The support material according to any one of claim 1 to 6, characterised in that the thermoplastic polymer is an LDPE, HDPE, LLDPE and/or polypropylene.
  8. The support material according to any one of claim 1 to 7, characterised in that the synthetic resin layer is a biaxially oriented polyolefin film.
  9. The support material according to any one of claim 1 to 8, characterised in that the coating weight of the synthetic resin layer on the front side is 5 to 50 g/m2, in particular 3 to 30 g/m2.
  10. The support material according to any one of claim 1 to 8, characterised in that the coating weight of the synthetic resin layer on the back side is 5 to 50 g/m2, in particular 10 to 40 g/m2.
  11. The support material according to claim 1, characterised in that the binder is a hydrophilic film-forming polymer.
  12. The support according material to claim 1 or 11, characterised in that the binder is a hydroxypropylated starch and/or thermally modified starch.
  13. The support material according to any one of claims 1 to 12, characterised in that the hydrophilic binder comprises a starch having a Brookfield viscosity of 50 to 600 mPas, in particular 100 to 400 mPas, preferably 200 to 300 mPas, measured for a 25% solution at 50°C and 100 rpm.
  14. The support material according to any one of claims 1 to 12, characterised in that the layer contains a pigment having a narrow grain size distribution in which at least 70% of the pigment particles have a diameter of less than 1 µm.
  15. The support material according to claim 14, characterised in that the pigment is a calcium carbonate, kaolin, talc, titanium dioxide and/or barium sulphate.
  16. The support material according to claim 14 or 15, characterised in that the binder/pigment quantitative ratio is 0.1 to 1.5, in particular 0.9 to 1.3.
  17. The support material according to any one of claims 12 to 16, characterised in that the coating weight of the binder containing layer 20 g/m2 at most, in particular 2 to 6 g/m2.
  18. The support material according to any one of claims 12 to 17, characterised in that the binder containing layer is arranged on the front side and/or back side of the raw paper.
EP20070727229 2006-03-24 2007-03-22 Layer support for recording materials Not-in-force EP2010712B1 (en)

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DE200610014183 DE102006014183A1 (en) 2006-03-24 2006-03-24 Base material for recording media, e.g. for photographic applications or ink jet printing, comprises base paper made from hardwood pulp, e.g. eucalyptus, with a low content of very short fibres and a given filler content
PCT/EP2007/052754 WO2007110367A1 (en) 2006-03-24 2007-03-22 Layer support for recording materials

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UA97429C2 (en) † 2007-12-21 2012-02-10 Текноцелл Декор Гмбх Унд Ко. Кг Base paper for decorative coating materials
JP5597163B2 (en) * 2010-06-04 2014-10-01 キヤノン株式会社 recoding media
EP2586620B1 (en) * 2011-10-28 2014-06-18 Canon Kabushiki Kaisha Recording medium
WO2014186953A1 (en) 2013-05-22 2014-11-27 Dow Global Technologies Llc Paper composition and process for making the same
JP2018513033A (en) * 2015-03-23 2018-05-24 ストラ エンソ オーワイジェイ Ink-jet ink-receptive coating comprising esterified or etherified starch and inorganic mineral
CN117183607A (en) * 2020-05-22 2023-12-08 王子控股株式会社 Printed matter, method for producing printed matter, and printing medium for laser printing
CN112319083A (en) * 2020-11-02 2021-02-05 蚌埠金黄山凹版印刷有限公司 Novel photoetching packaging material and preparation method thereof
JP7120429B1 (en) * 2021-11-24 2022-08-17 王子ホールディングス株式会社 Ultraviolet laser printing paper, printed matter, processed product, and method for producing printed matter

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CN101410570A (en) 2009-04-15
CA2642924C (en) 2015-12-22

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