EP0669605B1 - Flexible rubber/synthetic resin-bonded permanent magnetic foil and method of manufacturing it - Google Patents

Flexible rubber/synthetic resin-bonded permanent magnetic foil and method of manufacturing it Download PDF

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Publication number
EP0669605B1
EP0669605B1 EP95102532A EP95102532A EP0669605B1 EP 0669605 B1 EP0669605 B1 EP 0669605B1 EP 95102532 A EP95102532 A EP 95102532A EP 95102532 A EP95102532 A EP 95102532A EP 0669605 B1 EP0669605 B1 EP 0669605B1
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EP
European Patent Office
Prior art keywords
synthetic resin
permanent magnetic
bonded
manufacturing
rubber
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.)
Expired - Lifetime
Application number
EP95102532A
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German (de)
French (fr)
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EP0669605A1 (en
Inventor
Detlef Haas
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.)
Haas & Co Magnettechnik GmbH
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Haas & Co Magnettechnik GmbH
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Publication of EP0669605A1 publication Critical patent/EP0669605A1/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F7/00—Signs, name or number plates, letters, numerals, or symbols; Panels or boards
    • G09F7/02—Signs, plates, panels or boards using readily-detachable elements bearing or forming symbols
    • G09F7/04—Signs, plates, panels or boards using readily-detachable elements bearing or forming symbols the elements being secured or adapted to be secured by magnetic means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/10—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
    • H01F1/11—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
    • H01F1/113—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent
    • H01F1/117—Flexible bodies

Definitions

  • the invention relates to a rubber or synthetic resin-bonded, flexible permanent magnetic film which is provided on one or both sides with a layer.
  • the invention further relates to a method for producing such a film.
  • Permanent magnetic foils of this type are known. They generally consist of a rubber or synthetic resin-bonded, powdered permanent magnet material based on oxide, wherein foils of different thicknesses are available in tape or plate form and are magnetized using a special magnetization process. Plastic layers or color layers were generally used here, for example for a corresponding print.
  • the previously known permanent magnetic films have the disadvantage that they do not withstand larger temperature differences in particular. It has been shown that, for example, permanent magnetic foils used as signs, if they are attached to motor vehicles or outdoors on ferromagnetic boards, are damaged in sunlight and in the event of greater heating, in that the plastic layer, in particular the lacquer layer, becomes damaged dissolves. Particularly in the case of motor vehicles, it was observed that the layers of the permanent magnetic film on the paint on the motor vehicle body left clear traces which can no longer be eliminated.
  • DE-U-69 28 773 it has already been proposed to apply a thin layer of a water-repellent or waterproof, temperature-resistant material to a magnetically adhesive plate on the adhesive surface.
  • This material consists of a silicone-containing material, for example a silicone lacquer, a silicone wax or the like.
  • Paper, plastics, textile materials or the like can then be applied to the side of the soft magnetic material. Furthermore, an adhesive can be provided on the back, which is covered with a silicone paper.
  • the present invention is based on the object of creating a rubber or synthetic resin-bonded, flexible permanent magnet film which does not have the disadvantages mentioned above and which retains excellent stability and stability in naturally occurring temperature ranges.
  • a rubber or synthetic resin-bonded, flexible permanent magnetic film in tape or plate form with a coating on one or both sides is proposed is characterized in that the layer consists of a fluoroethylene-vinyl ether copolymer (trademark registered as "Teflon").
  • the permanent magnetic film according to the invention has the essential advantage that it is extremely robust and has excellent strength.
  • the surface can also be printed with suitable colors.
  • Teflon generally consists of a fluoroethylene-vinyl ether copolymer in a thin coating.
  • This copolymer is made from thermosetting fluorine plastics that are formed from fluorethylene and vinyl ether. This copolymer can be dissolved by a solvent, and a "crosslinking reaction” occurs at room or lower temperatures when mixed with the hardening agent, from which a stable coating later develops.
  • the copolymer can be dissolved by solvents, it can be spread on the surface in a specified thickness. It is also possible to spread the copolymer on uneven surfaces. It has been shown that the magnetic sheet does not become attached or blocked or stains on the surface during long storage and holding.
  • the copolymer can be applied by brushing, rolling, spraying, knife coating or the like onto the surface of the permanent magnet film, the copolymer consisting of a fluoroethylene vinyl ether which is mixed with a curing agent and with a solvent. After it is applied to the surface of a plastic-bonded magnetic film, it hardens. It has been shown that there is no influence on the surface of the magnetic film or the surface of the support.
  • a layer 2 of Teflon is applied to a flexible, synthetic resin-bonded permanent magnet film 1.
  • the layer can be applied to the film on one or both sides.
  • the copolymer can be applied by brushing, rolling, spraying, knife coating or the like onto the surface of the plastic-bonded magnetic film, the copolymer consisting of fluoroethylene-vinyl ether which is mixed with hardening agents and solvents. After the copolymer has been spread on, the curing process is started by volatilization of the solvent and the action of the curing agent, so that it adheres firmly to the magnetic film in the applied layer.
  • the layer can also be provided with a removable protective plastic layer which is removed before the film is used.
  • the film has the essential advantage that it is largely protected by the Teflon layer on the one hand and on the other hand the Teflon layer itself prevents the film from affecting the documents.

Abstract

A rubber or resin-bonded flexible permanent magnetic foil has, on one or both sides, a coating of a fluoroethylene-vinyl ether copolymer ('Teflon', RTM). Prodn. of the above foil involves (a) mixing the copolymer with a hardener and a solvent; (b) applying the mixt. to the foil surface by means of an applicator roll, brush or the like; and (c) hardening.

Description

Die Erfindung betrifft eine gummi- oder kunstharzgebundene, flexible Dauermagnetfolie, die ein- oder beidseitig mit einer Schicht versehen ist. Die Erfindung betrifft ferner ein Verfahren zur Herstellung einer derartigen Folie.The invention relates to a rubber or synthetic resin-bonded, flexible permanent magnetic film which is provided on one or both sides with a layer. The invention further relates to a method for producing such a film.

Derartige Dauermagnetfolien sind bekannt. Sie bestehen im allgemeinen aus einem gummi- oder kunstharzgebundenen, pulverisierten Dauermagnetmaterial auf Oxidbasis, wobei Folien von unterschiedlicher Dicke entsprechend der Größe der Weiterverarbeitung in Band- oder Plattenform vorliegen und mit einem besonderen Magnetisierungsverfahren magnetisiert sind. Hierbei wurden im allgemeinen Kunststoffschichten oder Farbschichten, beispielsweise für einen entsprechenden Aufdruck, verwendet.Permanent magnetic foils of this type are known. They generally consist of a rubber or synthetic resin-bonded, powdered permanent magnet material based on oxide, wherein foils of different thicknesses are available in tape or plate form and are magnetized using a special magnetization process. Plastic layers or color layers were generally used here, for example for a corresponding print.

Die bisher bekannten Dauermagnetfolien weisen jedoch den Nachteil auf, daß sie insbesondere größeren Temperaturunterschieden nicht standhalten. So hat es sich gezeigt, daß beispielsweise als Schilder verwendete Dauermagnetfolien, wenn sie an Kraftfahrzeugen oder im Freien an ferromagnetischen Tafeln angebracht sind, bei Sonneneinstrahlung und bei größerer Erwärmung dadurch beschädigt werden, daß die Kunststoffschicht, insbesondere die Lackschicht, sich auflöst. Vor allem bei Kraftfahrzeugen wurde beobachtet, daß die Schichten der Dauermagnetfolie am Lack der Kraftfahrzeugkarosserie deutliche und nicht mehr beseitigbare Spuren hinterließen.However, the previously known permanent magnetic films have the disadvantage that they do not withstand larger temperature differences in particular. It has been shown that, for example, permanent magnetic foils used as signs, if they are attached to motor vehicles or outdoors on ferromagnetic boards, are damaged in sunlight and in the event of greater heating, in that the plastic layer, in particular the lacquer layer, becomes damaged dissolves. Particularly in the case of motor vehicles, it was observed that the layers of the permanent magnetic film on the paint on the motor vehicle body left clear traces which can no longer be eliminated.

In der DE-U-69 28 773 wurde bereits vorgeschlagen, bei einer magnetisch haftenden Platte auf der Haftfläche eine dünne Schicht aus einem wasserabstoßenden oder wasserdichten, temperaturfesten Werkstoff aufzubringen. Dieser Werkstoff besteht dabei aus einem silikonhaltigen Werkstoff, beispielsweise einem Silikonlack, einem Silikonwachs od. dgl.In DE-U-69 28 773 it has already been proposed to apply a thin layer of a water-repellent or waterproof, temperature-resistant material to a magnetically adhesive plate on the adhesive surface. This material consists of a silicone-containing material, for example a silicone lacquer, a silicone wax or the like.

In der DE-U-69 34 001 wurde vorgeschlagen, bei einem Flächenmagneten in Form dünner Platten oder Bänder auf einer dünnen Folie aus einem weichmagnetischen Material durch Aufrakeln, Siebdrucken oder Aufsprühen eine dünne Schicht aus einem in einem kunststoffdispergierten Dauermagnetwerkstoff aufzubringen.In DE-U-69 34 001 it was proposed to apply a thin layer made of a plastic magnet-dispersed permanent magnet to a surface magnet in the form of thin plates or strips on a thin foil made of a soft magnetic material by knife coating, screen printing or spraying.

Auf der Seite des weichmagnetischen Materials können dann Papier, Kunststoffe, Textilstoffe od. dgl. aufgebracht werden. Ferner kann an der Rückseite ein Kleber vorgesehen sein, der mit einem Silikonpapier abgedeckt ist.Paper, plastics, textile materials or the like can then be applied to the side of the soft magnetic material. Furthermore, an adhesive can be provided on the back, which is covered with a silicone paper.

Es hat sich jedoch gezeigt, daß die Verwendung von Silikonmaterial vielfach nicht ausreicht, um die Resistenz der Dauermagnetfolie gegen Witterungseinflüsse und größere Temperaturunterschiede zu erhöhen.However, it has been shown that the use of silicone material is often not sufficient to increase the resistance of the permanent magnet film to weather influences and larger temperature differences.

Der vorliegenden Erfindung liegt nun die Aufgabe zugrunde, eine gummi- oder kunstharzgebundene, flexible Dauermagnetfolie zu schaffen, die die oben genannten Nachteile nicht aufweist und die bei natürlich vorkommenden Temperaturbereichen eine ausgezeichnete Stabilität und Standfestigkeit behält.The present invention is based on the object of creating a rubber or synthetic resin-bonded, flexible permanent magnet film which does not have the disadvantages mentioned above and which retains excellent stability and stability in naturally occurring temperature ranges.

Zur Lösung der gestellten Aufgabe wird eine gummi- oder kunstharzgebundene, flexible Dauermagnetfolie in Band- oder Plattenform mit ein- oder beidseitiger Beschichtung vorgeschlagen, die dadurch gekennzeichnet ist, daß die Schicht aus einem Fluoroethylene-Vinylether Copolymer (als "Teflon" eingetragenes Warenzeichen) besteht.To solve the problem, a rubber or synthetic resin-bonded, flexible permanent magnetic film in tape or plate form with a coating on one or both sides is proposed is characterized in that the layer consists of a fluoroethylene-vinyl ether copolymer (trademark registered as "Teflon").

Es hat sich gezeigt, daß eine derartige Schicht größeren Hitzeeinflüssen standhält und daß Beschädigungen am Lack der Auflage der Dauermagnetfolie nicht mehr auftreten.It has been shown that such a layer withstands greater heat influences and that damage to the coating of the permanent magnet film no longer occurs.

Außerdem weist die Dauermagnetfolie gemäß der Erfindung den wesentlichen Vorteil auf, daß sie äußerst robust ist und eine ausgezeichnete Festigkeit aufweist. Ferner kann auch die Oberfläche mit geeigneten Farben bedruckt werden.In addition, the permanent magnetic film according to the invention has the essential advantage that it is extremely robust and has excellent strength. The surface can also be printed with suitable colors.

Das unter dem Warenzeichen "Teflon" bekanntgewordene Material besteht im allgemeinen aus einem Fluoroethylene-Vinylether Copolymer in dünner Beschichtung. Dieses Copolymer ist aus duroplastischen Fluorin-Kunststoffen hergestellt, die aus Fluorethylene und Vinylether gebildet werden. Dieses Copolymer kann durch ein Lösungsmittel gelöst werden, und es entsteht unter Raum- oder niederigeren Temperaturen beim Mischen mit dem Härtungsmittel eine "crosslinking-Reaktion", woraus sich später eine stabile Beschichtung entwickelt.The material known under the trademark "Teflon" generally consists of a fluoroethylene-vinyl ether copolymer in a thin coating. This copolymer is made from thermosetting fluorine plastics that are formed from fluorethylene and vinyl ether. This copolymer can be dissolved by a solvent, and a "crosslinking reaction" occurs at room or lower temperatures when mixed with the hardening agent, from which a stable coating later develops.

Da das Copolymer durch Lösungsmittel gelöst werden kann, kann es in einer spezifizierten Stärke auf die Oberfläche aufgestrichen werden. Außerdem ist es möglich, das Copolymer auf unebene Flächen aufzustreichen. Es hat sich gezeigt, daß ein Festlegen oder Blockieren der Magnetfolie oder Flecken auf der Oberfläche während langer Lagerung und Halterung nicht auftreten.Since the copolymer can be dissolved by solvents, it can be spread on the surface in a specified thickness. It is also possible to spread the copolymer on uneven surfaces. It has been shown that the magnetic sheet does not become attached or blocked or stains on the surface during long storage and holding.

Das Copoylmer kann durch Aufstreichen, Aufwalzen, Aufsprühen, Aufrakeln od. dgl. auf die Oberfläche der Dauermagnetfolie aufgebracht werden, wobei das Copolymer aus einem Fluoroethylene-Vinylether besteht, das mit einem Härtungsmittel und mit einem Lösungsmittel gemischt ist. Nachdem es auf die Oberfläche einer kunststoffgebundenen Magnetfolie aufgebracht ist, erhärtet es. Dabei hat es sich gezeigt, daß weder eine Beeinflussung der Oberfläche der Magnetfolie noch der Oberfläche der Auflage stattfindet.The copolymer can be applied by brushing, rolling, spraying, knife coating or the like onto the surface of the permanent magnet film, the copolymer consisting of a fluoroethylene vinyl ether which is mixed with a curing agent and with a solvent. After it is applied to the surface of a plastic-bonded magnetic film, it hardens. It has been shown that there is no influence on the surface of the magnetic film or the surface of the support.

Anhand der Zeichnung soll am Beispiel einer bevorzugten Ausführungsform die Dauermagnetfolie gemäß der Erfindung näher erläutert werden.The permanent magnet film according to the invention will be explained in more detail using the example of a preferred embodiment.

In der Zeichnung zeigen

Fig. 1
eine Draufsicht und
Fig. 2
einen Längsschnitt durch eine rechteckförmige Dauermagnetfolie.
Show in the drawing
Fig. 1
a top view and
Fig. 2
a longitudinal section through a rectangular permanent magnet film.

Wie sich aus der Zeichnung ergibt, ist auf einer flexiblen, kunstharzgebundenen Dauermagnetfolie 1 eine Schicht 2 aus Teflon aufgebracht. Die Schicht kann ein- oder beidseitig auf der Folie aufgebracht sein.As can be seen from the drawing, a layer 2 of Teflon is applied to a flexible, synthetic resin-bonded permanent magnet film 1. The layer can be applied to the film on one or both sides.

Das Aufbringen des Copolymers kann durch Aufstreichen, Aufwalzen, Aufsprühen, Aufrakeln od. dgl. auf die Oberfläche der kunststoffgebundenen Magnetfolie erfolgen, wobei das Copolymer aus Fluoroethylene-Vinylether besteht, das mit Härtungsmitteln und Lösungsmitteln gemischt ist. Nach dem Aufstreichen des Copolymers wird der Härtungsvorgang durch Verflüchtigung des Lösungsmittels und der Wirkung des Härtungsmittels in Gang gesetzt, so daß es in der aufgebrachten Schicht fest auf der Magnetfolie haftet.The copolymer can be applied by brushing, rolling, spraying, knife coating or the like onto the surface of the plastic-bonded magnetic film, the copolymer consisting of fluoroethylene-vinyl ether which is mixed with hardening agents and solvents. After the copolymer has been spread on, the curing process is started by volatilization of the solvent and the action of the curing agent, so that it adheres firmly to the magnetic film in the applied layer.

Selbstverständlich kann die Schicht auch noch mit einer abziehbaren Kunststoffschutzschicht versehen werden, die vor Anwendung der Folie abgezogen wird. Die Folie weist den wesentlichen Vorteil auf, daß sie einerseits durch die Teflonschicht weitgehend geschützt ist und andererseits die Teflonschicht selbst verhindert, daß Beeinträchtigungen von der Folie auf die Unterlagen erfolgen.Of course, the layer can also be provided with a removable protective plastic layer which is removed before the film is used. The film has the essential advantage that it is largely protected by the Teflon layer on the one hand and on the other hand the Teflon layer itself prevents the film from affecting the documents.

Claims (2)

  1. Rubber- or synthetic resin-bonded, flexible permanent magnetic foil in band or sheet form with one- or both-sided coating, characterised in that the coating consists of a fluoroethylene-vinyl ether copolymer.
  2. Method of manufacturing a rubber- or synthetic resin-bonded, flexible permanent magnetic foil in band or sheet form with one- or both-sided coating, characterised in that a fluoroethylene-vinyl ether copolymer is mixed with a hardening agent and a solvent, which is applied to the surface of the rubber- or synthetic resin-bonded magnet foil by spreading by means of rollers, brushes or the like and subsequently is subjected to a hardening process.
EP95102532A 1994-02-24 1995-02-22 Flexible rubber/synthetic resin-bonded permanent magnetic foil and method of manufacturing it Expired - Lifetime EP0669605B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9403071U DE9403071U1 (en) 1994-02-24 1994-02-24 Rubber or synthetic resin-bonded, flexible permanent magnet foil
DE9403071U 1994-02-24

Publications (2)

Publication Number Publication Date
EP0669605A1 EP0669605A1 (en) 1995-08-30
EP0669605B1 true EP0669605B1 (en) 1997-07-23

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ID=6905052

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EP95102532A Expired - Lifetime EP0669605B1 (en) 1994-02-24 1995-02-22 Flexible rubber/synthetic resin-bonded permanent magnetic foil and method of manufacturing it

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EP (1) EP0669605B1 (en)
AT (1) ATE155917T1 (en)
DE (2) DE9403071U1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030152731A1 (en) * 2002-02-08 2003-08-14 Deetz Dayton J. Self-adhesive magnet receptive surface covering

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1221568B (en) * 1963-01-25 1966-07-21 Formeta Fritz Fortenbacher Magnetically adhesive license plate, especially for motor vehicles
DE1204543B (en) * 1962-04-19 1965-11-04 Formeta Fritz Fortenbacher Magnetically adhesive license plate, especially for motor vehicles
DE6928773U (en) * 1969-07-18 1969-12-04 Fritz Fortenbacher MAGNETICALLY ADHESIVE PLATE MADE OF RUBBER- OR PLASTIC-BONDED PERMANENT MAGNETIC MATERIAL
DE1936977A1 (en) * 1969-07-21 1971-02-04 Fritz Fortenbacher Magnetically adhering plate made of rubber or plastic-bonded permanent magnet material
DE6934001U (en) * 1969-08-28 1969-12-11 Hermann Holtz AREA MAGNETS IN THE SHAPE OF THIN PLATES OR STRIPS
DE1943914C3 (en) * 1969-08-29 1974-06-06 Hermann 6200 Wiesbaden Holtz Process for the production of area magnets in the form of thin plates or strips
US3908065A (en) * 1974-04-15 1975-09-23 Minnesota Mining & Mfg Magnetic embossable label tape laminate
JPS57169929A (en) * 1981-04-13 1982-10-19 Tdk Corp Magnetic recording medium and its manufacture
JPS62229519A (en) * 1986-03-29 1987-10-08 Canon Inc Magnetic recording medium
JP3199795B2 (en) * 1991-11-21 2001-08-20 株式会社東芝 Winding wire and induction motor
DE9314638U1 (en) * 1993-09-28 1993-12-16 Remus Produktions Und Vertrieb Magnetic carrier with at least one magnetic adhesive body

Also Published As

Publication number Publication date
DE9403071U1 (en) 1994-05-05
ATE155917T1 (en) 1997-08-15
DE59500401D1 (en) 1997-08-28
EP0669605A1 (en) 1995-08-30

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