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).

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Optics & Photonics (AREA)
• Paper (AREA)
• Ink Jet Recording Methods And Recording Media Thereof (AREA)
• Laminated Bodies (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

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• 2006
  • 2006-03-24 DE DE200610014183 patent/DE102006014183A1/de not_active Withdrawn
• 2007
  • 2007-03-22 PL PL07727229T patent/PL2010712T3/pl unknown
  • 2007-03-22 CA CA2642924A patent/CA2642924C/en not_active Expired - Fee Related
  • 2007-03-22 WO PCT/EP2007/052754 patent/WO2007110367A1/de not_active Ceased
  • 2007-03-22 US US12/224,964 patent/US7993757B2/en not_active Expired - Fee Related
  • 2007-03-22 RU RU2008142142A patent/RU2405079C2/ru not_active IP Right Cessation
  • 2007-03-22 CN CN2007800105603A patent/CN101410570B/zh not_active Expired - Fee Related
  • 2007-03-22 EP EP20070727229 patent/EP2010712B1/de not_active Not-in-force
  • 2007-03-22 JP JP2009500871A patent/JP5081222B2/ja not_active Expired - Fee Related

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