EP2326992B1 - Matériau d'enregistrement pour un procédé d'impression laser - Google Patents

Matériau d'enregistrement pour un procédé d'impression laser Download PDF

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Publication number
EP2326992B1
EP2326992B1 EP20090783066 EP09783066A EP2326992B1 EP 2326992 B1 EP2326992 B1 EP 2326992B1 EP 20090783066 EP20090783066 EP 20090783066 EP 09783066 A EP09783066 A EP 09783066A EP 2326992 B1 EP2326992 B1 EP 2326992B1
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EP
European Patent Office
Prior art keywords
recording material
material according
toner
synthetic resin
copolymer
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.)
Active
Application number
EP20090783066
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German (de)
English (en)
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EP2326992A1 (fr
Inventor
Christoph Kozlowski
Rainer Steinbeck
Andreas Overberg
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.)
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Priority to EP20090783066 priority Critical patent/EP2326992B1/fr
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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G03G7/002—Organic components thereof
    • G03G7/0026—Organic components thereof being macromolecular
    • G03G7/004—Organic components thereof being macromolecular obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G03G7/002—Organic components thereof
    • G03G7/0026—Organic components thereof being macromolecular
    • G03G7/0046—Organic components thereof being macromolecular obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/006—Substrates for image-receiving members; Image-receiving members comprising only one layer
    • G03G7/0073—Organic components thereof
    • G03G7/008—Organic components thereof being macromolecular
    • 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.]

Definitions

  • the invention relates to a recording material for electrophotographic recording methods, in particular the laser printing method, comprising a resin-coated paper support and a toner-receiving layer and the use of the recording material for the production of photobooks.
  • 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
  • a copy image
  • the wet processes use as a developer a suspension of a low dielectric constant aliphatic solvent and the toner, while the dry process uses a powder.
  • 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 is then passed over the image drum. It just brushes past 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 collected.
  • electrophotographic images are produced on substrates that have the feel and look of a typical silver salt photo. These include properties such as gloss, stiffness and opacity, high resolution and sharpness, and good light resistance.
  • an electrophotographic image-receiving material comprising a thermoplastic-coated base paper and a toner-receiving layer, and an antistatic backing layer.
  • a disadvantage of this material is that it can only be printed on one side and still in need of improvement in terms of toner fixation and behavior in the printer.
  • the resin-coated base papers used as support material in the recording materials usually consist of a glued base paper, which is preferably coated on both sides with polyolefin by means of (co) extrusion.
  • thermoplastic polymers such as low density polyethylene (LDPE), ethylene / ⁇ -olefin copolymer (so-called linear low density polyethylene (LLDPE), high density polyethylene (HDPE) and polypropylene used.
  • toner-printed recording papers are masked immediately after printing, undesirable smudging of the toner particles on the back side of the material lying thereon often occurs.
  • the covering of the printed papers is done in practice, for example, when storing the fresh expression in foil packaging, albums or when stacking multiple prints in the printer.
  • photo books that can be customized.
  • design of such photo books is a wide selection of printing techniques and the recording materials used for this purpose, in particular the photographic paper available.
  • a photo-base paper coated with photographic emulsions is used, on the front side of which images are produced wet-chemically according to the conventional silver salt process.
  • the sheets of paper illustrated on the front side are glued together on the backs in the next step and bound together in a book.
  • This is expensive and associated with higher production costs. Therefore, both sides of the printable coated satin-finished papers are used to produce the photo books, which can be printed in an electrophotographic process.
  • the images produced in this approach are in terms of color density, light and ozone stability and the behavior in the printing device (collection, transport and training of stacks) in need of improvement.
  • a recording material containing a coated on both sides with a synthetic resin base paper and at least one disposed on both sides toner receiving layer, wherein the resin coated paper has a specific surface topography, expressed by a roughness value Rz of 1.5 to 13 microns and has an average Ra value of 0.05 to 2 ⁇ m, the toner-receiving layer contains a polymer combination of a toner-receiving ethylene-acrylic acid copolymer (A), a carboxylated acrylic copolymer (B) and a polymer (C), and the polymer (C ) has a mean particle size d 50 of 5 to 20 ⁇ m and a melting point above the melting range of the copolymer (A) and below the melting range of the copolymer (B).
  • the resin coated paper has a specific surface topography, expressed by a roughness value Rz of 1.5 to 13 microns and has an average Ra value of 0.05 to 2 ⁇ m
  • the toner-receiving layer contains a 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, optical brighteners, fillers Pigments, dyes, defoamers and other known in the paper industry tools may contain.
  • 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 1.2 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. These can also be used mixed. In particular, however, pulp fibers of 100% hardwood pulp are 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.
  • the resin layers (front and back resin layers) disposed on both sides 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), polypropylene, 4-methylpentene-1 and mixtures thereof and polyesters, for example polycarbonates.
  • the front and rear synthetic resin layer contains at least 40 wt.% HDPE having a density of more than 0.935 g / cm 3 , in particular 50 to 70 wt.%.
  • Particularly preferred is a composition consisting of 50% by weight HDPE having a density greater than 0.935 g / cm 3 and 50% 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.
  • 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 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 synthetic resin layers are applied symmetrically on both sides of the base paper, ie, the front and back resin layers have the same composition. Also in terms of surface topography, these layers are identical.
  • the surface structure (topography) is generated by means of the cooling cylinders used in the extrusion coating. It can be characterized by roughness values.
  • the surface of the synthetic resin layer on both sides has roughness values Rz of 1.8 to 11 ⁇ m and an average Ra value of 0.1 to 1.8 ⁇ m.
  • the cooling cylinders used to produce the surface structure are manufactured in a known manner.
  • the surface of a steel cylinder can be treated by blasting with sand, glass or other blasting material and then chrome-plated.
  • the surface of the cylinder can also be built up in a conventional manner in a chromium bath electrolytic.
  • the polymer (A) of the polymer combination in the ink-receiving layer preferably has a melting range of 70 to 100 ° C and the polymer (B) has a melting range of 160 to 210 ° C.
  • the polymer (B) can be characterized by a so-called acid number.
  • An acid number defines the amount of free carboxyl groups in the polymer. she indicates the amount (mg) of 0.1 molar KOH solution needed to neutralize the free acid groups in 1 g of polymer.
  • the polymer (B) used according to the invention has an acid number of more than 100. Particularly suitable are polymers having an acid number of 120 to 160.
  • the polymers (A) and (B) are preferably used in a quantitative ratio of 70:30 to 30:70. Particularly good effects were achieved at a ratio of 60:40 to 40:60.
  • the polymer (C) preferably has a melting point in a temperature range of 120 to 150 ° C.
  • Particularly suitable for this purpose are polyethylene waxes, polyamides and mixtures thereof.
  • the polymer (C) is preferably used in an amount of 0.1 to 5.0% by weight, more preferably 1.0 to 4.0% by weight, based on the dried layer.
  • an antistatic agent is contained in the toner-receiving layer in an amount of from 0.1 to 5.0% by weight, in particular from 1.0 to 4.0% by weight, based on the dried layer.
  • the toner-receiving layer additionally contains anionic or nonionic surfactants in an amount of from 0.1 to 4.0% by weight, in particular from 0.5 to 2.5% by weight, based on the dried layer.
  • the toner-receiving layer may also contain other auxiliaries, for example matting agents, pigments, dyes, crosslinking agents, lubricants and other conventional additives.
  • auxiliaries for example matting agents, pigments, dyes, crosslinking agents, lubricants 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 is applied as a line by means of a custom applicator integrated within the extrusion coating line. For example, a 3-roller application or a squeegee device is particularly well suited for this purpose.
  • a pigment-containing layer can be arranged between the base paper and the synthetic resin layer.
  • 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.
  • 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.%. Particularly good results can be achieved with a proportion of 30 to 80% by weight of the total pigment.
  • a pigment with a narrow particle size distribution according to the invention is also understood to mean pigments having a particle size distribution in which at least about 70% by weight of the pigment particles has a size of less than about 1 ⁇ m and 40 to 80% by weight of these pigment particles the difference between the pigment having the 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 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.
  • Particularly suitable for this purpose are film-forming starches such as thermally modified starches, in particular corn starches or hydroxypropylated starches.
  • the pigment-containing 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 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.
  • further layers such as protective layers or gloss-improving layers can be applied to the toner-receiving layer.
  • the application weight is preferably less than 1 g / m 2 .
  • a eucalyptus pulp was used.
  • the pulp was milled as an approximately 5% aqueous suspension (thick matter) with the aid of a refiner to a freeness of 35 ° SR.
  • the mean fiber length was 0.65 mm.
  • the concentration of pulp fibers in the thin material was 1% by weight, based on the mass of the pulp suspension.
  • the thin stock additives were added as a neutral sizing agent alkylketene dimer (AKD) is present in an amount of from 0.48.%, Wet strength agents polyamine-polyamide-epichlorohydrin resin (Kymene ®) in an amount of 0.36 wt.% And a natural CaCO 3 in in an amount of 20% by weight.
  • the quantities are based on the pulp mass.
  • the thinness whose pH was adjusted to about 7.5, was brought from the head box to the wire of the paper machine, followed by sheet formation while dewatering the web in the paper machine Wire section of the paper machine was done. In the press section, the further dewatering of the paper web was carried out to a water content of 60% by weight, based on the web weight. Further drying took place in the drying section of the paper machine with heated drying cylinders. The result was a base paper with a basis weight of 163 g / m 2 and a humidity of about 6%.
  • the coating was carried out in a laminator (tandem extruder) at an extrusion speed of 250 m / min using a cooling cylinder from the company BEP Service Technology whose surface has a mean Rz value of 11.03 microns and a Ra value of 1.87 ⁇ m.
  • the surface of the cooling cylinder was produced by sandblasting or blasting with other blasting material and chrome plated.
  • the application weights on both sides were 15 g / m 2 each.
  • the coated weight of the dried toner-receiving layer was 0.5 g / m 2 on both sides.
  • the material prepared according to the invention was tested for image quality, light and ozone resistance.
  • the tests were based on color prints made with the HP Color Laser Jet 2605dn laser printer (wet toner) and the Konica Minolta MC5550 color copier. Bar-like areas in cyan, magenta, yellow, red, green, blue, and black were printed at 100% saturation.
  • the samples were stored for 24 hours in an ozone chamber at an ozone concentration of 3.5 ppm, a temperature of 20 to 22 ° C and a relative humidity of 40 to 50%. Subsequently, again measured the colorimetric L * a * b * values of the color areas and determined the degree of bleaching ⁇ E.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Laminated Bodies (AREA)

Claims (15)

  1. Matériau d'enregistrement pour un procédé électrophotographique, qui comprend un papier brut, revêtu de résine synthétique sur les deux faces, et au moins une couche de réception de toner, disposée sur les deux faces,
    caractérisé en ce que le papier revêtu de résine synthétique est doté d' une topographie superficielle, spécifique, qui est exprimée par une valeur de rugosité Rz de 1,5 à 13 µm et une valeur Ra moyenne de 0,05 à 2 µm, que la couche de réception de toner contient une combinaison polymère composée d'un copolymère éthylène - acide acrylique (A) récepteur de toner, d'un copolymère ester - acide acrylique carboxylé (B) et d'un polymère (C), et q u e le polymère (C) est présente une grosseur de particule d50% de 5 à 20 µm et un point de fusion qui est situé au-dessus de la plage de fusion du copolymère (A) et au-dessous de la plage de fusion du copolymère (B).
  2. Matériau d'enregistrement selon la revendication 1,
    caractérisé en ce que la plage de fusion du copolymère (A) est de 70 à 100 °C et celle du copolymère (B) de 160 à 210 °C.
  3. Matériau d'enregistrement selon les revendications 1 et 2,
    caractérisé en ce que le point de fusion du polymère (C) est situé dans une plage de 120 à 150 °C.
  4. Matériau d'enregistrement selon l'une des revendications 1 à 3,
    caractérisé en ce que le polymère (C) est une résine de polyéthylène, un polyamide ou un mélange de ceux-ci.
  5. Matériau d'enregistrement selon au moins l'une des revendications 1 à 4,
    caractérisé en ce que le rapport quantitatif copolymère (A) / copolymère (B) est de 70 : 30 à 30 : 70.
  6. Matériau d'enregistrement selon au moins l'une des revendications 1 à 5,
    caractérisé en ce que la quantité du polymère (C) est de 0,1 à 5 % en poids par rapport à la couche séchée.
  7. Matériau d'enregistrement selon au moins l'une des revendications 1 à 6, caractérisé en ce que la couche de réception de toner contient des particules anorganiques.
  8. Matériau d'enregistrement selon au moins l'une des revendications 1 à 7,
    caractérisé en ce que le poids d'application de la couche réceptrice de toner est de 0,1 à 3 g / m2, en particulier de 0,3 à 0,7 g / m2.
  9. Matériau d'enregistrement selon au moins l'une des revendications 1 à 8,
    caractérisé en ce que la couche de résine synthétique de la face avant et de la face arrière contient un polymère thermoplastique, choisi à partir du groupe des polyoléfines et des polycarbonates.
  10. Matériau d'enregistrement selon la revendication 9,
    caractérisé en ce que le polymère thermoplastique est un polyéthylène de haute densité (HDPE) ou un 4-Méthylpenten-1.
  11. Matériau d'enregistrement selon au moins l'une des revendications 1 à 10, caractérisé en ce que, entre le papier brut et la couche de résine synthétique, est disposée une couche contenant un pigment.
  12. Matériau d'enregistrement selon la revendication 11,
    caractérisé en ce que le pigment est un carbonate de calcium, du kaolin, du talc, du dioxyde de titane et / ou du sulfate de baryum ou que le pigment est un mélange de carbonate de calcium et de kaolin.
  13. Procédé de fabrication d'un matériau d'enregistrement qui comprend un papier brut, revêtu sur les deux faces d'une couche de résine synthétique, et au moins une couche de réception de toner qui est disposée sur les deux faces,
    caractérisé en ce qu'il comprend les étapes suivantes :
    - revêtement de la face avant et de la face arrière du papier brut avec au moins une couche de résine synthétique, sachant que la composition et la topographie superficielle des couches de résine synthétique sont égales sur les deux faces,
    - revêtement de la couche de résine synthétique de la face avant et de la face arrière avec au moins une couche de réception de toner selon les revendications 1 à 8.
  14. Procédé selon la revendication 13, caractérisé en ce que la couche de réception de toner est appliquée en ligne à l'intérieur de l'installation de revêtement par extrusion.
  15. Album photo fabriqué par utilisation d'un matériau d'enregistrement selon au moins l'une des revendications 1 à 14.
EP20090783066 2008-09-19 2009-09-16 Matériau d'enregistrement pour un procédé d'impression laser Active EP2326992B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20090783066 EP2326992B1 (fr) 2008-09-19 2009-09-16 Matériau d'enregistrement pour un procédé d'impression laser

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP08105391 2008-09-19
PCT/EP2009/061988 WO2010031782A1 (fr) 2008-09-19 2009-09-16 Matériau d'enregistrement pour un procédé d'impression laser
EP20090783066 EP2326992B1 (fr) 2008-09-19 2009-09-16 Matériau d'enregistrement pour un procédé d'impression laser

Publications (2)

Publication Number Publication Date
EP2326992A1 EP2326992A1 (fr) 2011-06-01
EP2326992B1 true EP2326992B1 (fr) 2015-04-22

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US (1) US20110163528A1 (fr)
EP (1) EP2326992B1 (fr)
JP (1) JP5394489B2 (fr)
CN (1) CN102159998B (fr)
WO (1) WO2010031782A1 (fr)

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CN102159998A (zh) 2011-08-17
WO2010031782A1 (fr) 2010-03-25
US20110163528A1 (en) 2011-07-07
JP5394489B2 (ja) 2014-01-22
EP2326992A1 (fr) 2011-06-01
JP2011528811A (ja) 2011-11-24
CN102159998B (zh) 2013-11-13

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