Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
  • G03G7/0053—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
  • G03G7/0093—Image-receiving members, based on materials other than paper or plastic sheets, e.g. textiles, metals
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, 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
  • Y10T428/256—Heavy metal or aluminum or compound thereof
• • 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
  • Y10T428/256—Heavy metal or aluminum or compound thereof
  • Y10T428/257—Iron oxide or aluminum oxide
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
  • Y10T428/259—Silicic material
• • 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]
  • Y10T428/31678—Of metal
• • 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]
  • Y10T428/31678—Of metal
  • Y10T428/31692—Next to addition polymer from unsaturated monomers
• • 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]
  • Y10T428/31678—Of metal
  • Y10T428/31692—Next to addition polymer from unsaturated monomers
  • Y10T428/31699—Ester, halide or nitrile of addition polymer

Definitions

• the invention relates to a recording material with which photo-quality images can be produced by electrophotographic printing processes.
• the laser printer is based on the principle of electrophotography. Electrophotography, by imaging a photoconductor with the optical image of an original, produces a latent image of electrical charges which is subsequently used to selectively apply a toner (development) and an image (copy) of the original, for example, on paper. to create.
• a toner development
• an image copy
• the wet processes also called liquid toner processes, use as developers a suspension of a low dielectric constant aliphatic solvent and the toner, while the dry process uses a powder. With the aid of a collimated laser beam and a rotating mirror, an image of the desired side is drawn on the photosensitive drum.
• the drum is initially negatively charged, with the charge being reversed at the points where the laser beam strikes.
• the shape of the discharged areas on the drum corresponds to the later expression.
• the paper In the dry toner method, the paper is then passed over the image drum. It only touches the drum. Behind the paper a potential field is built up. The toner is transferred to the paper, where it is initially loose. Then the toner is fixed by means of a hot roller and under pressure. The drum is unloaded and excess toner removed from it.
• the toner suspension is first transferred to a heated blanket cylinder, on which the carrier liquid is evaporated and the toner is plasticized. From this intermediate drum, the toner image is then transferred to the recording sheet.
• the images produced with the help of a laser printer should achieve a quality comparable to a photograph. These include properties such as gloss, stiffness, opacity, high resolution and sharpness, and good lightfastness.
• an image-receiving material for electrophotography comprising a thermoplastic-coated base paper and a toner-receiving layer, and an antistatic backing layer.
• a disadvantage of this material is that it still needs improvement in terms of toner fixation and behavior in the printer.
• such materials show troublesome shiny spots which are due to the oil-like substances often used as release agents in the toner formulations.
• a recording material comprising a support material and at least one toner-receiving layer, the recording material containing a metal-coated plastic film disposed between the support material and the toner-receiving layer, the toner-receiving layer being disposed on the metal-coated side of the plastic film is.
• metals are used for coating the plastic film, which have an electrical conductivity of at most 40 x 10 6 S / m. Electrical conductivity refers to the ability of a substance to conduct electrical current, the reciprocal of which is resistivity. Particularly suitable for this purpose is aluminum.
• the plastic film suitable for coating with the metal may be a polyolefin film, for example a polyethylene or polypropylene film. It can be single-layered or multi-layered. Preferably, a multilayer biaxially oriented polyolefin film, in particular a polypropylene film is used.
• the polyolefin film preferably contains a porous core layer and at least one substantially nonporous surface layer disposed on at least one side of the core layer.
• the thickness of the metal-coated plastic film may preferably be 10 to 50 ⁇ m.
• the metal-coated plastic film preferably has an opacity of more than 98% and a specific surface topography expressed by a roughness value Rz of 0.01 to 2 ⁇ m.
• the carrier material may be uncoated base paper, a coated base paper (pigmented layered base paper) or a resin coated paper.
• the toner-receiving layer may preferably contain a water-soluble and / or water-dispersible binder, a finely divided oil-absorbing pigment and / or an electrically conductive component, wherein the electrically conductive Component may be an electrically conductive finely divided oxide or an electrically conductive polymer.
• base paper is understood to mean an uncoated or surface-sized paper.
• a base paper may be in addition to pulp fibers, sizing agents such as alkylene dimers, 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 or cationic starches, optical brighteners, fillers, pigments , Dyes, defoamers and other known in the paper industry tools may contain.
• the base paper can be surface-sized.
• 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 1.2 g / cm 3 , in particular 0.90 to 1.1 g / cm 3 .
• pulp fibers for example, bleached hardwood kraft pulp (LBKP), bleached softwood kraft pulp (NBKP), bleached hardwood sulfite pulp (LBSP) or bleached softwood sulfite pulp (NBSP) can be used.
• Pulp fibers derived from paper wastes can also be used.
• the pulp fibers mentioned can also be used mixed and proportions of other fibers, for example of synthetic resin fibers, mixed.
• pulp fibers are preferred 100% hardwood pulp used.
• the mean fiber length of the unground pulp is preferably 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.
• fillers for example, kaolins, calcium carbonate in its natural forms 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 raw paper.
• Particularly suitable is calcium carbonate with a particle size distribution in which at least 60% of the particles are 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 pigment-containing layer can be arranged on the base paper.
• the pigment may be a metal oxide, silicate, carbonate, sulfide or sulfate.
• 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 is at least 5 wt .-%, in particular 10 to 90 wt .-%.
• a proportion of the pigment having the narrow particle size distribution of from 30 to 80% by weight of the total pigment.
• a pigment with a narrow particle size distribution according to the invention also understood to mean pigments having a particle size distribution in which at least about 70% by weight of the pigment particles have a size of less than about 1 ⁇ m and at 40 to 80% by weight of these pigment particles the difference between the pigment having the largest particle size (diameter) and the pigment of the smallest grain size is smaller than about 0.4 ⁇ m.
• a pigment mixture consisting of the abovementioned calcium carbonate and kaolin can be used in the pigment-containing layer.
• the quantitative ratio calcium carbonate / kaolin is preferably 30:70 to 70:30.
• the amount ratio of binder / pigment in the pigment-containing layer may be 0.1 to 2.5, preferably 0.2 to 1.5, but especially about 0.9 to 1.3.
• Any known water-soluble and / or water-dispersible binder can be used in the pigment-containing layer.
• film-forming starches such as thermally modified starches, in particular corn starches or hydroxypropylated starches, are particularly suitable for this purpose.
• the pigment-containing layer can be applied in-line or off-line with all customary in papermaking application units, the order quantity is chosen so that after drying the application weight 0.1 to 30 g / m 2 , in particular 1 to 20 g / m 2 , or According to a particularly preferred embodiment, 2 to 8 g / m 2 .
• the pigment-containing layer is applied with a size press or film press integrated within the paper machine.
• the base paper or the coated base paper on both sides with synthetic resin layers be provided.
• the resin layers may preferably contain a thermoplastic polymer.
• Particularly suitable for this purpose are polyolefins, for example low density polyethylene (LDPE), high density polyethylene (HDPE), polypropylene, 4-methylpentene-1 and mixtures thereof and polyesters, for example polycarbonates.
• the thermoplastic polymer is a biodegradable polymer and / or a polymer based on renewable raw materials such as a linear polyester, thermoplastic modified starch, or polylactic acid or a mixture of these polymers with each other or with other polymers.
• the front and / or rear synthetic resin layer contains at least 40 wt .-% HDPE having a density of more than 0.95 g / cm 3 , in particular 60 to 80 wt .-%.
• Particularly preferred is a composition consisting of 65% by weight HDPE having a density greater than 0.95 g / cm 3 and 35% by weight LDPE having a density of less than 0.935 g / cm 3 .
• the synthetic resin layers may contain white pigments such as titanium dioxide as well as other auxiliaries such as optical brighteners, dyes and dispersing aids.
• antistatic substances in particular electrically conductive inorganic pigments, are added to the synthetic resin layers.
• the coating weight of the synthetic resin layers may be 5 to 50 g / m 2 , in particular 5 to 30 g / m 2 , but preferably 10 to 20 g / m 2 .
• the synthetic resin layer can be extruded onto the base paper or the coated base paper in one layer or be multilayered coextruded.
• the extrusion coating can be carried out at machine speeds up to 600 m / min.
• the synthetic resin layers may, in one embodiment of the invention, be applied symmetrically on both sides of the base paper, i. the resin layers on both sides of the base paper have the same composition and are identical in surface topography.
• the surface of the synthetic resin layer may have roughness values Rz of 0.03 to 15 ⁇ m on both sides. The determination of the roughness Rz is carried out by a Hommel surface scanner according to DIN 4768.
• the resin layer on the side of the recording material carrying the toner-receiving layer and intended for printing (front side) has less roughness than that on the back side
• the side of the synthetic resin layer intended for printing has roughness values Rz of 0.03 to 1.8 ⁇ m
• the synthetic resin layer arranged on the side not intended for printing has roughness values Rz of 12 to 16 ⁇ m.
• a metal-coated plastic film is laminated on the intended for printing side of the carrier material, in particular a base paper or coated base paper, according to the invention.
• a polymeric layer preferably low density polyethylene (LDPE)
• LDPE low density polyethylene
• the thickness of the polyethylene layer is 6 to 15 g / m 2 , in particular 6 to 10 g / m 2 .
• the metal-coated plastic film can be laminated according to the invention on one side or on both sides of the carrier material.
• the back of the substrate may be extrusion coated with a thermoplastic polymer.
• a thermoplastic polymer Particularly suitable for this purpose are polyolefins, for example low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene, 4-methylpentene-1 and mixtures thereof, and also polyesters.
• the application weight of the backside polymer layer may be 5 to 50 g / m 2 , in particular 5 to 30 g / m 2 .
• a single-layered or multi-layered plastic film, in particular a biaxially oriented polypropylene film can be applied to the rear side.
• the core layer may contain substantially non-porous surface layers on both sides.
• the metal-coated side of the film applied to the substrate is painted in the next step with a toner-receiving coating solution which forms a toner-receiving layer after drying.
• a toner-receiving coating solution which forms a toner-receiving layer after drying.
• the metal-coated plastic film and the toner-receiving layer are applied on both sides of the substrate.
• the toner-receiving layer preferably comprises at least one water-soluble and / or water-dispersible binder, a finely divided pigment and / or an electrically conductive component.
• the binder in the toner-receiving layer can be any binder commonly used for paper coatings, preferably starch, polyvinyl alcohol, acrylates or copolymers of acrylates with other monomers are used.
• Particularly preferred binders are ethylene-acrylic acid copolymers, especially those having a melting range of 70 to 100 ° C.
• the finely divided pigment in the toner-receiving layer according to the invention is a finely divided inorganic pigment, for example silica, alumina, alumina hydrate, aluminum silicate, calcium carbonate, zinc oxide, tin oxide, antimony oxide, titanium dioxide, indium oxide or a mixed oxide of these oxides.
• the finely divided pigment is zinc oxide, tin oxide, antimony oxide, titanium dioxide indium oxide or a mixed oxide of these oxides.
• the finely divided pigments may be present individually or as mixtures in the toner-receiving layer.
• the finely divided pigments in the toner-receiving layer preferably have an average particle size of less than 1000 nm, in particular less than 200 nm. Particular preference is given to pigments having a BET surface area of from 30 m 2 / g to 400 m 2 / g. Pigments according to the invention can be obtained by the flame process or by wet-chemical precipitation processes.
• the electrically conductive component in the toner-receiving layer can be an electrically conductive polymer and / or an electrically conductive pigment.
• Electrically conductive polymers according to the invention may be those in which the electrical charge is transported in the form of ions, such as polystyrene sulfonic acid. However, preference is given to polymers in which the electric charge in the form of Electrons or holes are transported, for example, polyanilines and polythiophenes. Is particularly preferred as the conductive polymer doped with polystyrene acid poly (3,4-ethylene-dioxythiophene) (PEDOT: PSS), which is available for example under the names CLEVIOS ® or ORGACON ®. If, according to the invention, a polymer is used as the electrically conductive component in the toner-receiving layer, in a particular embodiment of the invention it can replace the water-soluble or water-dispersible binder in whole or in part.
• Conductive pigments according to the invention may consist inter alia of metal powder or carbon. However, preference is given to oxides such as antimony oxide, tin oxide, indium oxide or, with particular preference, titanium dioxide or zinc oxide or mixed oxides of the elements antimony, indium, titanium, zinc or tin.
• the conductive pigments of the invention preferably have an average particle size of less than 1000 nm, more preferably less than 200 nm. If a conductive pigment is used as the electroconductive component, in a preferred embodiment of the invention it may also simultaneously constitute the finely divided pigment of the toner-receiving layer.
• the amount of the electrically conductive component in the toner-receiving layer is selected so that the surface resistance of the recording material is less than 15 log (ohms / cm), measured according to DIN 53483. According to the invention, it can be in a range from 0 to 50 wt. in particular 0.1 to 4.0 wt .-%, based on the mass of the dried layer, are.
• the toner-receiving layer additionally contains anionic or nonionic surfactants in an amount of 0.01 to 4.0 wt .-%, in particular 0.05 to 2.5 wt .-%, based on the dried layer ,
• the toner-receiving layer may also contain other adjuvants, such as matting agents, dyes, crosslinking agents, lubricants, anti-blocking agents, and other conventional additives.
• adjuvants such as matting agents, dyes, crosslinking agents, lubricants, anti-blocking agents, and other conventional additives.
• the coating composition for forming the toner-receiving layer 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 of at most 3 g / m 2 , in particular 0.1 to 2 g / m 2 , or according to a particularly preferred embodiment is 0.3 to 0.7 g / m 2 .
• the coating composition can be applied as a coating by means of a custom coating unit integrated within the extrusion coating installation. For example, a 3-roller application or a squeegee device is particularly well suited for this purpose.
• further layers such as protective layers or gloss-improving layers can be applied to the toner-receiving layer.
• the coating weight of such layers is preferably less than 1 g / m 2 .
• a base paper A was made from eucalyptus pulp. For grinding, the pulp was ground as an approximately 5% aqueous suspension (thick matter) with the aid of a refiner to a freeness of 36 ° SR. The mean fiber length was 0.64 mm. The concentration of pulp fibers in the thin was 1 wt .-%, based on the mass of the pulp suspension. Additives such as cationic starch in an amount of 0.4% by weight, as a neutral sizing agent alkyl ketene dimer (AKD) in an amount of 0.48% by weight, wet strength agent polyamine-polyamide-epichlorohydrin resin (Kymene®) were added to the thin material.
• Additives such as cationic starch in an amount of 0.4% by weight, as a neutral sizing agent alkyl ketene dimer (AKD) in an amount of 0.48% by weight, wet strength agent polyamine-polyamide-epichlorohydrin resin (Ky
• the quantities are based on the pulp mass.
• the thinstock whose pH was adjusted to about 7.5, was transferred from the head box to the wire of the paper machine, followed by sheet formation by 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 60 wt .-%, based on the web weight. Further drying took place in the dryer section of the paper machine with heated drying cylinders. The result was a base paper with a basis weight of 160 g / m 2 and a humidity of about 7%.
• the base paper is coated on both sides with a coating of a styrene-acrylate binder, starch and a pigment mixture of calcium carbonate and kaolin with a coating weight of 15 g / m 2 on both sides, dried and then smoothed with a calender.
• the material thus obtained is referred to below as base paper A and used for the subsequent lamination of the metal-coated film in the extruder.
• Base paper B was produced in the same way as base paper A from eucalyptus pulp. In the pulp dispersion, however, it additionally contains titanium dioxide in an amount such that the base paper web after completion contains 10% by weight of TiO 2 , based on dry matter. This base paper B was used directly, without applying a further coating composition, for the subsequent lamination of the metal-coated film in an extruder.
• Both surfaces (front sides) of the base papers A and B intended for printing were laminated in the extruder after irradiation with a corona discharge with a metallized multilayer biaxially oriented polypropylene film (BOPP film, PZN, Vibac GmbH), whereby a film of polyethylene lower Density (LDPE) was extruded between the paper backing material and the plastic film.
• the thickness of the adhesion-promoting polyethylene film was 8 g / m 2 .
• the cooling cylinder was chosen so that the resulting surface of the back has a roughness of 0.9 microns, measured as Rz value according to DIN 4768.
• the materials obtained are hereinafter referred to as A1 and B1.
• the sides coated with the metallized film were coated with the toner-receiving coating and dried.
• the application amount of the coating composition was chosen such that a dry application of 0.5 g / m 2 results.
• the composition of the coating compositions is below specified.
• a dispersion of 3.0 g of a conductive pigment (antimony-doped titanium-tin oxide FT-2000, manufactured by ISK IS-HIHARA SANGYO KAISHA Ltd., Japan) in 27 g of water was prepared and mixed by means of a rotor-stator mixing system (ULTRA-TURRAX ® from IKA ® , Germany) until the mean particle size of the pigment is 180 nm.
• a rotor-stator mixing system ULTRA-TURRAX ® from IKA ® , Germany
• Both intended for printing surfaces of the raw papers A and B were after irradiation with a corona discharge with a biaxially oriented polypropylene film TREFAN TND 35 (Manufacturer Treofan Germany GmbH & Co. KG) laminated.
• the backs of the papers were extrusion coated with a polyethylene blend as in the inventive examples.
• the resulting materials are referred to below as A2 and B2.
• Both intended for printing surfaces of the papers A2 and B2 were then coated with a toneraufichden coating and dried.
• the application amount of the coating composition was chosen such that a dry application of 0.5 g / m 2 results.
• the composition of the coating is given below.
• Bonding test Two sheets of the DIN A4 size substrate are stacked at 23 ° C and 50% RH and loaded with a 10 kg weight. After 65 hours, the leaves are separated manually and the sticking / gluing is evaluated.
• Toner adhesion The recording materials are printed with an HP ® Indigo ® 6000 electrophotographic printer and the adhesion of the toner is assessed at 23 ° C / 50% RH by affixing and repelling a TESA 4104 adhesive tape.
• Table 1 recording material surface resistivity bonding test toner adhesion shiners A1a invention 7.4 + + + Alb invention 12.0 + + + + A1c invention 12.5 + + + B1a invention 7.4 + + + B1b invention 12.0 + + + B1c invention 12.5 + + + A2d comparison > 14.9 ⁇ ⁇ - B2d comparison > 14.9 ⁇ ⁇ -
• the images obtained using the recording materials according to the invention have a similar appearance with silver halide images and a comparable haptics.
• the adhesion of the toner to the surface is good in the recording materials according to the invention, the leaves do not stick together, do not accumulate electrostatically and give a uniform Toner transfer using both dry and liquid toners. Gloss spots by drops of the oils used in the toner as auxiliaries are safely avoided.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Laminated Bodies (AREA)
• Paper (AREA)

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• 2011
  • 2011-03-30 EP EP20110160422 patent/EP2506078B1/de active Active
• 2012
  • 2012-03-29 US US13/434,113 patent/US20120251775A1/en not_active Abandoned
  • 2012-03-30 JP JP2012080563A patent/JP2012212141A/ja active Pending
  • 2012-03-30 CN CN2012102284348A patent/CN102864690A/zh active Pending

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