EP0035106B1 - Process for producing a record carrier coated with a lacquer layer containing a contrast agent and a layer containing aluminium, and record carrier produced thereby - Google Patents

Process for producing a record carrier coated with a lacquer layer containing a contrast agent and a layer containing aluminium, and record carrier produced thereby Download PDF

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Publication number
EP0035106B1
EP0035106B1 EP19810100298 EP81100298A EP0035106B1 EP 0035106 B1 EP0035106 B1 EP 0035106B1 EP 19810100298 EP19810100298 EP 19810100298 EP 81100298 A EP81100298 A EP 81100298A EP 0035106 B1 EP0035106 B1 EP 0035106B1
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EP
European Patent Office
Prior art keywords
calcium carbonate
lacquer
lacquer layer
process according
record carrier
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Expired
Application number
EP19810100298
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German (de)
French (fr)
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EP0035106A3 (en
EP0035106A2 (en
Inventor
Dietrich Jürgen Dr. Bahr
Marian Dipl.-Ing. Briska
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International Business Machines Corp
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International Business Machines Corp
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Publication of EP0035106A2 publication Critical patent/EP0035106A2/en
Publication of EP0035106A3 publication Critical patent/EP0035106A3/en
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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
    • B41M5/24—Ablative recording, e.g. by burning marks; Spark recording
    • B41M5/245—Electroerosion or spark recording
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/913—Material designed to be responsive to temperature, light, moisture
    • 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
    • Y10T428/258—Alkali metal or alkaline earth metal 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
    • Y10T428/27—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, 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]
    • Y10T428/31678—Of metal
    • Y10T428/31703—Next to cellulosic
    • 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
    • Y10T428/31975—Of cellulosic next to another carbohydrate
    • Y10T428/31978—Cellulosic next to another cellulosic
    • Y10T428/31982—Wood or paper
    • 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
    • Y10T428/31975—Of cellulosic next to another carbohydrate
    • Y10T428/31978—Cellulosic next to another cellulosic
    • Y10T428/31986—Regenerated or modified

Definitions

  • the invention relates to a method for producing a recording medium coated with a lacquer layer containing a contrast agent and a metallic layer preferably consisting of aluminum or containing aluminum, in which the lacquer layer is pigmented with finely divided calcium carbonate grains which protrude beyond the lacquer layer surface.
  • a structure of a record carrier is described in GB-A-1 325 033 for improving legibility by increasing the contrast at the printing positions relative to the respective environment.
  • the writing electrodes When printing on paper coated with aluminum, as well as on paper or plastic films, which are provided with another metallic coating, the writing electrodes must be in constant contact with the metallic layer, i. H. they continuously grind on the record carrier.
  • the difficulties encountered so far and the solutions created by the invention are to be described in the following in connection with a recording medium coated with aluminum. Since the electrodes burn out the aluminum mostly with their front edges in the writing direction when grinding on the record carrier, they run in the burned-out areas on the underlying layer, usually black or dark colored.
  • diatomaceous earth that the abrasion properties change so drastically after a single stroke that uneven wear occurs when electrodes overlap results from their electrode diameter, so that they are no longer able to write with their entire surface.
  • diatomaceous earth still shows an abrasion that is up to 10 times greater than that of pure carbon pigmentation.
  • the invention solves the problem of reliably avoiding the formation of such tough and hard residues.
  • a precipitated calcium carbonate with a narrow grain size distribution is preferably used.
  • a heat-resistant lacquer one of the esters of acetyl cellulose can be used with particular success. It is particularly favorable if a lacquer containing cellulose acetobutyrate is used.
  • the coloring will be matched to the color of the lacquer, ie in the case of a carbon-containing lacquer layer, the calcium carbonate will be colored dark. This dark color can be achieved, for example, by diffusion with heavy metals.
  • the coloring of the calcium carbonate by joint precipitation with a colored heavy metal ion, such as e.g. B. a color cation containing iron carbonates or z. B. Mn 4+ . It is very important that the calcium carbonar be prepared for itself with the desired, narrowly limited particle size distribution before it is added to the lacquer.
  • plastic films can in principle be used as the base material, it is particularly advantageous here if paper is used as the base material.
  • the lacquer layer consists of a heat-resistant lacquer which contains about 0.5 to 5 percent by weight of finely divided, fine-grained calcium carbonate contains a grain size of about 2 11m to 10 1 1m and preferably as the paint layer contains about 2000 to 5000 CaC0 3 grains per mm 2 and the finely divided, fine-grained calcium carbonate material is colored dark.
  • the heat-resistant lacquer for which an ester of acetyl cellulose could be used, but for which a lacquer consisting essentially of cellulose acetobutyrate and containing carbon as a pigment is preferably used, is now prepared as follows.
  • the calcium carbonate can be produced directly by precipitation with the desired narrow grain size distribution lying between about 2 11 m to about 10 11 m. This avoids the grinding process, which would certainly also produce grain sizes below 2 ⁇ m.
  • the paint components are prepared on their own and mixed with a solvent and a binder in the usual way. The calcium carbonate is then mixed into this liquid lacquer. Since calcium carbonate is known to be white, it must be colored to increase the contrast.
  • the calcium carbonate should be colored dark. This can preferably be achieved by diffusion with heavy metals, but in particular with great advantage by joint precipitation with colored heavy metal ions. It should be noted that calcium carbonate, like hardly any other material, can be produced in a precisely defined grain size if it is obtained by precipitation. The grain size distribution is hardly influenced by the proposed coloring.
  • a narrow grain size distribution is very important, because grains that are too small are ineffective as such, because they only fill the lacquer without, however, protruding over the lacquer surface and also take away the space necessary for the contrast. If the grain size is too large, the electrodes lift too far from the aluminum surface, making the writing process unnecessarily difficult.
  • a temperature-resistant or heat-resistant paint such as. B. cellulose acetate butyrate is due to the fact that the pigments must not be removed from the lacquer film, because otherwise they move loosely between the electrode face and paper surface, so that the electrodes run like balls and interfere with the writing process. This means, for example, that nitrocellulose is completely unsuitable as a lacquer film.
  • Calcium carbonate is also soft per se and has so little sharp edges that the electrode wear is only about twice as high as with pure carbon pigmentation, but hard enough so that the pigmentation particles are not destroyed by the electrodes. Calcium carbonate is also extremely cheap and can also be easily added to the paint.
  • the method according to the invention has created a recording medium which, even with very fine electrode tips and at very high writing speeds, completely eliminates the difficulties which have hitherto been caused by the "baking" of the dusty writing residues.

Landscapes

  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Paints Or Removers (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines mit einer kontrastmittelhaltigen Lackschicht und einer vorzugsweise als Aluminium bestehenden oder Aluminium enthaltenden metallischen Schicht überzogenen Aufzeichnungsträgers, bei dem die Lackschicht mit feinverteilten, über die Lackschichtoberfläche hinausragenden Calciumcarbonatkörnern pigmentiert ist. Ein derartiger Aufbau eines Aufzeichnungsträgers ist in der GB-A-1 325 033 zur Lesbarkeitsverbesserung durch Kontrasterhöhung an den Druckpositionen relativ zur jeweiligen Umgebung beschrieben.The invention relates to a method for producing a recording medium coated with a lacquer layer containing a contrast agent and a metallic layer preferably consisting of aluminum or containing aluminum, in which the lacquer layer is pigmented with finely divided calcium carbonate grains which protrude beyond the lacquer layer surface. Such a structure of a record carrier is described in GB-A-1 325 033 for improving legibility by increasing the contrast at the printing positions relative to the respective environment.

Beim Drucken auf mit Aluminium beschichtetem Papier, wie auch auf Papieren oder Kunststoffolien, die mit einem anderen metallischen Überzug versehen sind, müssen die Schreibelektroden ständigen Kontakt mit der metallischen Schicht aufweisen, d. h. sie schleifen dauernd auf dem Aufzeichnungsträger. Obgleich andere metallische Überzüge verwendet werden können, sollen im folgenden die bisher aufgetretenen Schwierigkeiten und die durch die Erfindung geschaffenen Lösungen grundsätzlich im Zusammenhang mit einem mit Aluminium beschichteten Aufzeichnungsträger beschrieben werden. Da die Elektroden das Aluminium beim Schleifen auf dem Aufzeichnungsträger überwiegend mit ihren Vorderkanten in Schreibrichtung ausbrennen, laufen sie in den ausgebrannten Stellen auf der darunter liegenden, meist schwarz oder dunkel eingefärbten Lackschicht. Während des Ausbrennvorgangs erhitzen sie sich in ihrer Spitze, die in ihrem heißen Zustand den oberen Teil der Lackschicht zersetzt, wodurch unter anderem Dämpfe entstehen, die sich in den normalerweise staubförmigen Schreibrückständen um die Elektroden herum niederschlagen, d. h. kondensieren. Mit der Zeit bildet sich dort ein zäher bis harter Kuchen, der, sobald er die Elektroden vollständig einhüllt, den Schreibvorgang soweit stört, daß nicht mehr gedruckt werden kann. Ob bzw. wie schnell ein derartiges »Backen« auftritt, hängt unter anderem von der Schreibfrequenz, d. h. vom Schwarzanteil des Druckens ab.When printing on paper coated with aluminum, as well as on paper or plastic films, which are provided with another metallic coating, the writing electrodes must be in constant contact with the metallic layer, i. H. they continuously grind on the record carrier. Although other metallic coatings can be used, the difficulties encountered so far and the solutions created by the invention are to be described in the following in connection with a recording medium coated with aluminum. Since the electrodes burn out the aluminum mostly with their front edges in the writing direction when grinding on the record carrier, they run in the burned-out areas on the underlying layer, usually black or dark colored. During the burn-out process, they heat up in their tip, which in their hot state decomposes the upper part of the lacquer layer, which, among other things, produces vapors which are reflected in the normally dusty writing residues around the electrodes, i. H. condense. Over time, a tough to hard cake forms there, which, as soon as it completely encases the electrodes, disrupts the writing process to such an extent that it can no longer be printed. Whether or how quickly such "baking" occurs depends, among other things, on the write frequency, i. H. on the black portion of printing.

Eine Möglichkeit, diese sehr störende Erscheinung zu verringern, bzw. überhaupt zu beseitigen, besteht darin, höher temperaturfeste Lacke zu verwenden. Bisher konnte allerdings eine vollständige Unterdrückung dieser Erscheinung auf diesem Wege nicht erreicht werden, da an den Elektrodenspitzen Temperaturen von mehr als 1000° C auftreten können.One way to reduce this annoying phenomenon, or to eliminate it at all, is to use higher temperature resistant varnishes. So far, however, it has not been possible to completely suppress this phenomenon in this way, since temperatures of more than 1000 ° C. can occur at the electrode tips.

Man könnte an sich daran denken, dem Lack hochtemperaturfeste Pigmente beizumischen, deren Korn größer als die Lacktrockenschichtdicke ist, so daß sie aus dem Lack teilweise herausragen. Wird ihre Dichte hoch genug erwählt, so kann erreicht werden, daß die Elektroden nur auf den Spitzen der Pigmente laufen und mit dem Lack gar nicht oder nur selten in Berührung kommen. Solche Pigmentbeimischungen sind bereits angewendet worden. Es wurden allerdings Stoffe gewählt, die entweder so hart sind, wie z. B. Siliciumdioxid, daß der Elektrodenabrieb unerträglich hoch wird, oder aber die in ihrer Struktur so empfindlich sind, wie zum Beispiel amorphes Si02: Diatomeenerde, daß sich die Abriebeigenschaften nach einmaligem Überstreichen so drastisch ändern, daß bei überlappt schreibenden Elektroden sich ein ungleichmäßiger Abrieb über deren Elektrodendurchmesser ergibt, so daß sie nicht mehr mit ihrer ganzen Fläche zu schreiben vermögen. Diatomeenerde zeigt aber selbst gegenüber reiner Kohlenstoffpigmentierung immer noch einen bis zu 10mal stärkeren Abrieb.One could think of adding high-temperature-resistant pigments to the paint, the grain of which is larger than the paint dry layer thickness, so that they partially protrude from the paint. If their density is chosen high enough, it can be achieved that the electrodes run only on the tips of the pigments and do not come into contact with the lacquer or only rarely. Such pigment admixtures have already been used. However, substances were chosen that are either as hard as e.g. B. silicon dioxide, that the electrode wear becomes unbearably high, or that are so sensitive in their structure, such as amorphous Si0 2 : diatomaceous earth, that the abrasion properties change so drastically after a single stroke that uneven wear occurs when electrodes overlap results from their electrode diameter, so that they are no longer able to write with their entire surface. However, diatomaceous earth still shows an abrasion that is up to 10 times greater than that of pure carbon pigmentation.

Die Erfindung, wie sie in den Patentansprüchen gekennzeichnet ist, löst die Aufgabe, die Bildung derartiger zäher und harter Rückstände zuverlässig zu vermeiden.The invention, as characterized in the claims, solves the problem of reliably avoiding the formation of such tough and hard residues.

Vorzugsweise wird dabei ein gefälltes Calciumcarbonat mit einer engen Korngrößenverteilung verwendet. Als hitzebeständiger Lack kann man mit besonderem Erfolg einen der Ester der Acetylcellulose einsetzen. Besonders günstig wird es, wenn man einen Celluloseacetobutyrat enthaltenden Lack verwendet.A precipitated calcium carbonate with a narrow grain size distribution is preferably used. As a heat-resistant lacquer, one of the esters of acetyl cellulose can be used with particular success. It is particularly favorable if a lacquer containing cellulose acetobutyrate is used.

Wenn man den Anteil von CaC03 über 5% hinaus auf beispielsweise 10% oder 15% erhöht, erzielt man damit keine spürbare weitere Verbesserung der durch die Erfindung gewonnenen Eigenschaften.If you increase the proportion of CaC0 3 beyond 5% to 10% or 15%, for example, you will not achieve any noticeable further improvement in the properties obtained by the invention.

Da Calciumcarbonat von Natur aus weiß oder farblos ist, wird gemäß einer Weiterbildung der Erfindung vorgeschlagen, das Calciumcarbonat zur Erhöhung des Kontrastes einzufärben. Vorzugsweise wird man dabei die Einfärbung an die Färbung des Lackes angleichen, d. h. bei einer kohlenstoffhaltigen Lackschicht wird man das Calciumcarbonat dunkel einfärben. Diese dunkle Färbung kann man beispielsweise durch Eindiffusion mit Schwermetallen erreichen. Besonders vorteilhaft ist das Einfärben des Calciumcarbonats durch gemeinsames Ausfällen mit einem farbigen Schwermetallion, wie z. B. ein Farbkation enthaltende Eisencarbonate oder z. B. Mn4+. Dabei ist es ganz wesentlich, daß das Calciumcarbonar für sich vor der Beimischung zu dem Lack mit der gewünschten, eng begrenzten Korngrößenverteilung hergestellt wird.Since calcium carbonate is naturally white or colorless, it is proposed according to a further development of the invention to color the calcium carbonate to increase the contrast. Preferably, the coloring will be matched to the color of the lacquer, ie in the case of a carbon-containing lacquer layer, the calcium carbonate will be colored dark. This dark color can be achieved, for example, by diffusion with heavy metals. The coloring of the calcium carbonate by joint precipitation with a colored heavy metal ion, such as e.g. B. a color cation containing iron carbonates or z. B. Mn 4+ . It is very important that the calcium carbonar be prepared for itself with the desired, narrowly limited particle size distribution before it is added to the lacquer.

Obwohl grundsätzlich Kunststoffolien als Grundmaterial verwendet werden können, ist es hier von besonderem Vorteil, wenn als Grundmaterial Papier verwendet wird.Although plastic films can in principle be used as the base material, it is particularly advantageous here if paper is used as the base material.

Dadurch erhält man ein metallisiertes Aufzeichnungsträgermaterial mit einer Trägerschicht, einer dunklen Lackschicht und einer metallischen, vorzugsweise aluminiumhaltigen Deckschicht, die sich erfindungsgemäß dadurch auszeichnet, daß die Lackschicht aus einem hitzebeständigen Lack besteht, der etwa 0,5 bis 5 Gewichtsprozent an feinverteiltem, feinkörnigem Calciumcarbonat mit einer Korngröße von etwa 2 11m bis 10 11m enthält und wobei vorzugsweise die Lackschicht etwa 2000 bis 5000 CaC03 Körner je mm2 enthält und das feinverteilte, feinkörnige Calciumcarbonatmaterial dunkel eingefärbt ist.This gives a metallized recording medium with a carrier layer, a dark lacquer layer and a metallic, preferably aluminum-containing top layer, which is characterized according to the invention in that the lacquer layer consists of a heat-resistant lacquer which contains about 0.5 to 5 percent by weight of finely divided, fine-grained calcium carbonate contains a grain size of about 2 11m to 10 1 1m and preferably as the paint layer contains about 2000 to 5000 CaC0 3 grains per mm 2 and the finely divided, fine-grained calcium carbonate material is colored dark.

Dieses neue Verfahren hat nun ganz außerordentliche Vorteile, wenn man sich an die angegebenen Verfahrensregeln hält. Der hitzebeständige Lack, für den ein Ester der Acetylcellulose verwendet werden könnte, für den aber vorzugsweise ein im wesentlichen aus Celluloseacetobutyrat bestehender Lack verwendet wird, der als Pigment Kohlenstoff enthält, wird nun wie folgt zubereitet. Das Calciumcarbonat läßt sich mit der gewünschten engen zwischen etwa 2 11m bis etwa 10 11m liegenden Korngrößenverteilung unmittelbar durch Ausfällen herstellen. Dadurch wird der Mahlvorgang, der mit Sicherheit auch Korngrößen unter 2 µm liefern würde, vermieden. Die Lackbestandteile werden für sich angesetzt und in üblicher Weise mit einem Lösungsmittel und einem Bindemittel versetzt. Diesem flüssigen Lack wird dann das Calciumcarbonat beigemischt. Da Calciumcarbonat bekanntlich weiß ist, muß es zur Erhöhung des Kontrastes eingefärbt werden. Wenn kohlenstoffhaltige Lacke verwendet werden, sollte das Calciumcarbonat entsprechend dunkel eingefärbt werden. Dies läßt sich vorzugsweise durch Eindiffusion mit Schwermetallen, insbesondere aber mit großem Vorteil durch gemeinsames Ausfällen mit farbigen Schwermetallionen erreichen. Dabei ist darauf hinzuweisen, daß gerade Calciumcarbonat wie kaum ein anderes Material in genau definierter Korngröße hergestellt werden kann, wenn es durch Ausfällung gewonnen wird. Durch die vorgeschlagene Einfärbung wird die Korngrößenverteilung kaum beeinflußt.This new process now has extraordinary advantages if you follow the procedural rules given. The heat-resistant lacquer, for which an ester of acetyl cellulose could be used, but for which a lacquer consisting essentially of cellulose acetobutyrate and containing carbon as a pigment is preferably used, is now prepared as follows. The calcium carbonate can be produced directly by precipitation with the desired narrow grain size distribution lying between about 2 11 m to about 10 11 m. This avoids the grinding process, which would certainly also produce grain sizes below 2 µm. The paint components are prepared on their own and mixed with a solvent and a binder in the usual way. The calcium carbonate is then mixed into this liquid lacquer. Since calcium carbonate is known to be white, it must be colored to increase the contrast. If carbon-based paints are used, the calcium carbonate should be colored dark. This can preferably be achieved by diffusion with heavy metals, but in particular with great advantage by joint precipitation with colored heavy metal ions. It should be noted that calcium carbonate, like hardly any other material, can be produced in a precisely defined grain size if it is obtained by precipitation. The grain size distribution is hardly influenced by the proposed coloring.

Eine enge Korngrößenverteilung ist sehr wichtig, da zu kleine Körner als solche wirkungslos sind, weil sie nur den Lack ausfüllen, ohne jedoch über die Lackoberfläche herauszuragen und außerdem den für den Kontrast notwendigen Kohlenstoff den Platz wegnehmen. Ist die Körnung zu groß, dann heben die Elektroden zu weit von der Aluminiumoberfläche ab, wodurch der Schreibvorgang unnötig erschwert wird.A narrow grain size distribution is very important, because grains that are too small are ineffective as such, because they only fill the lacquer without, however, protruding over the lacquer surface and also take away the space necessary for the contrast. If the grain size is too large, the electrodes lift too far from the aluminum surface, making the writing process unnecessarily difficult.

Die Forderung nach einem temperaturfesten oder hitzebeständigem Lack, wie z. B. Celluloseacetobutyrat ist darauf zurückzuführen, daß die Pigmente nicht aus dem Lackfilm herausgelöst werden dürfen, weil sie sich sonst lose zwischen Elektrodenstirnfläche und Papieroberfläche bewegen, so daß die Elektroden wie auf Kugeln laufen und den Schreibvorgang empfindlich stören. Dies heißt beispielsweise, daß Nitrocellulose als Lackfilm hier völlig ungeeignet ist.The demand for a temperature-resistant or heat-resistant paint, such as. B. cellulose acetate butyrate is due to the fact that the pigments must not be removed from the lacquer film, because otherwise they move loosely between the electrode face and paper surface, so that the electrodes run like balls and interfere with the writing process. This means, for example, that nitrocellulose is completely unsuitable as a lacquer film.

Bei Verwendung von Calciumcarbonat gemäß der Erfindung spielen noch weitere Vorgänge eine Rolle. An den heißen Elektrodenspitzen zerfällt das Calciumcarbonat an der Oberfläche bei Berührung mit den Elektroden zu Calciumoxid und Kohlendioxid CaC03→ Ca0 + C02. Außerdem bildet sich in dem Lichtbogen an der Elektrodenspitze Calciumcarbid CaC2. Beide Stoffe gehören bekanntlich zu den stärksten hygroskopischen Materialien, die es gibt. Sie binden sofort das bei der Zersetzung von Nitraten und Acetaten freiwerdende Wasser, wirken somit als Trockenmittel und halten die gesamten Rückstände zwischen den Elektroden trocken, so daß kein »Backen« auftreten kann.When using calcium carbonate according to the invention, other processes also play a role. At the hot electrode tips, the calcium carbonate on the surface breaks down into calcium oxide and carbon dioxide CaC0 3 → Ca0 + C0 2 when they touch the electrodes. Calcium carbide CaC 2 also forms in the arc at the tip of the electrode. Both substances are known to be among the strongest hygroscopic materials available. They immediately bind the water released during the decomposition of nitrates and acetates, act as a drying agent and keep all residues between the electrodes dry, so that no "baking" can occur.

Ferner ist Calciumcarbonat an sich weich und so wenig scharfkantig, daß der Elektrodenabrieb nur etwa doppelt so hoch ist wie bei reiner Kohlenstoffpigmentierung, jedoch hart genug, damit die Pigmentierungsteilchen nicht durch die Elektroden zerstört werden. Ferner ist Calciumcarbonat äußerst billig und läßt sich zudem dem Lack leicht beimischen.Calcium carbonate is also soft per se and has so little sharp edges that the electrode wear is only about twice as high as with pure carbon pigmentation, but hard enough so that the pigmentation particles are not destroyed by the electrodes. Calcium carbonate is also extremely cheap and can also be easily added to the paint.

Man erkennt also, daß durch das erfindungsgemäße Verfahren ein Aufzeichnungsträgermaterial geschaffen worden ist, das auch bei sehr feinen Elektrodenspitzen und bei sehr hohen Schreibgeschwindigkeiten, die bisher durch das »Backen« der staubförmigen Schreibrückstände entstehenden Schwierigkeiten vollkommen beseitigt.It can thus be seen that the method according to the invention has created a recording medium which, even with very fine electrode tips and at very high writing speeds, completely eliminates the difficulties which have hitherto been caused by the "baking" of the dusty writing residues.

Claims (13)

1. A process for producing a record carrier coated with a lacquer layer containing a contrast agent and a metallic layer preferably consisting of or containing aluminium, wherein the lacquer layer is pigmented with finely distributed calcium carbonate particles protruding from the surface of the lacquer layer, characterized in that a lacquer layer comprising a heat-resistant lacquer is used and the amount of calcium carbonate in the lacquer layer is 0,5 to 5 percent by weight and the particle size about 211m to about 10 µm, so that under the influence of heat occurring during printing hygroscopic constituents of carbonate particles are freed for binding and drying moist decomposition matter also freed from the lacquer layer during printing.
2. The process according to claim 1, characterized in that a precipitated calcium carbonate with a dense particle size distribution is used.
3. The process according to claim 1, characterized in that a heat resistant lacquer of cellulose acetate esters is used.
4. The process according to any one of the preceding claims, characterized in that a lacquer is used which essentially contains cellulose acetate butyrate.
5. The process according to claim 1, characterized in that the calcium carbonate (CaC03) is dyed to increase the contrast.
6. The process according to claim 5, characterized in that the calcium corbonate is dyed dark.
7. The process according to claim 5 or 6, characterized in that the calcium carbonate is dyed by the diffusion of heavy-metals.
8. The process according to any one of the claims 5 or 6, characterized in that the calcium carbonate is dyed by being jointly precipitated with a coloured heavy-metal ion, such as Mn4 .
9. The process according to claim 1, characterized in that prior to being admixed to the lacquer, the calcium carbonate is reduced to the desired particle size.
10. The process according to claim 1, characterized in that paper is used as a substrate.
11. A metallized record carrier material produced according to any one or several of the claims 1 to 10, comprising a substrate, a dark lacquer layer pigmented with finely distributed calcium carbonate particles protruding from the surface of the lacquer layer, and a metallic top layer preferably containing aluminium, characterized in that the lacquer layer comprises a heat-resistant lacquer containing about 0.5 to 5 percent by weight of calcium carbonate (CaC03) having a particle size of about 2 µm to 10 11m, so that under the influence of heat occurring during printing hygroscopic constituents of the calcium carbonate particles are freed for binding and drying moist decomposition matter also freed from the lacquer layer during printing.
12. The record carrier Material according to claim 11, characterized in that the lacquer layer contains about 2000 to 5000 CaC03 particles per mm2.
13. The record carrier material according to claim 11 or 12, characterized in that the finely distributed, fine particle calcium carbonate material ist dyed dark.
EP19810100298 1980-02-27 1981-01-16 Process for producing a record carrier coated with a lacquer layer containing a contrast agent and a layer containing aluminium, and record carrier produced thereby Expired EP0035106B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803007330 DE3007330A1 (en) 1980-02-27 1980-02-27 METHOD FOR PRODUCING A RECORD CARRIER COATED WITH A CONTRASTANT-CONTAINING VARNISH LAYER AND ALUMINUM-CONTAINING LAYER, AND RECORD CARTRIDGE PRODUCED BY THIS
DE3007330 1980-02-27

Publications (3)

Publication Number Publication Date
EP0035106A2 EP0035106A2 (en) 1981-09-09
EP0035106A3 EP0035106A3 (en) 1982-03-31
EP0035106B1 true EP0035106B1 (en) 1985-08-21

Family

ID=6095677

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810100298 Expired EP0035106B1 (en) 1980-02-27 1981-01-16 Process for producing a record carrier coated with a lacquer layer containing a contrast agent and a layer containing aluminium, and record carrier produced thereby

Country Status (4)

Country Link
US (1) US4483902A (en)
EP (1) EP0035106B1 (en)
CA (1) CA1153639A (en)
DE (2) DE3007330A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3017449A1 (en) * 1980-05-07 1981-11-12 Robert Bosch Gmbh, 7000 Stuttgart REGISTRATION METAL PAPER
DE3039189A1 (en) * 1980-10-17 1982-05-06 Robert Bosch Gmbh, 7000 Stuttgart METHOD FOR PRODUCING A RECORDING CARRIER FROM REGISTRATION METAL PAPER
JPS59124888A (en) * 1982-12-30 1984-07-19 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Discharge recording material
DE3329981A1 (en) * 1983-08-19 1985-03-07 Robert Bosch Gmbh, 7000 Stuttgart RECORD CARRIER FOR REGISTRATION DEVICES
JPS6110490A (en) * 1984-06-26 1986-01-17 Fuji Kagakushi Kogyo Co Ltd Repeatedly usable type thermal transfer recording medium
FR2781796B1 (en) † 1998-07-28 2000-09-22 Rhone Poulenc Fibres LACTAM DEHYDRATION PROCESS

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE844829C (en) * 1950-10-23 1952-07-24 Bosch Gmbh Robert Recording measuring instrument with tape-shaped recording medium
LU33625A1 (en) * 1954-06-09
US3441940A (en) * 1966-09-15 1969-04-29 Phonocopy Inc Process for electro-junction thermography
DE2203861A1 (en) * 1971-01-30 1972-08-17
GB1325033A (en) * 1971-11-26 1973-08-01 Mason Ltd Nig Electrosensitive recording materials
US3786518A (en) * 1972-09-22 1974-01-15 Nig Mason Ltd Electrosensitive recording materials
DE2645485C3 (en) * 1976-10-08 1979-10-31 Robert Bosch Gmbh, 7000 Stuttgart Recording media for registration purposes in electrosensitive registration devices

Also Published As

Publication number Publication date
CA1153639A (en) 1983-09-13
DE3007330A1 (en) 1981-09-03
EP0035106A3 (en) 1982-03-31
EP0035106A2 (en) 1981-09-09
US4483902A (en) 1984-11-20
DE3171865D1 (en) 1985-09-26

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