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Dokumentenidentifikation EP1147016 10.03.2005
EP-Veröffentlichungsnummer 0001147016
Titel VERFAHREN ZUM AUFTRAGEN EINER MARKIERUNG AUF EIN TRÄGERMATERIAL
Anmelder Koninklijke Philips Electronics N.V., Eindhoven, NL
Erfinder WIELSTRA, Ytsen, NL-5656 AA Eindhoven, NL;
WINKEL, H., Jolanda, NL-5656 AA Eindhoven, NL;
HOVIUS, A., Jan, NL-5656 AA Eindhoven, NL;
TEEUW, H., Dirk, NL-5656 AA Eindhoven, NL
Vertreter derzeit kein Vertreter bestellt
DE-Aktenzeichen 60017872
Vertragsstaaten DE, ES, FR, GB, IT
Sprache des Dokument EN
EP-Anmeldetag 06.11.2000
EP-Aktenzeichen 009831132
WO-Anmeldetag 06.11.2000
PCT-Aktenzeichen PCT/EP00/10976
WO-Veröffentlichungsnummer 0001034402
WO-Veröffentlichungsdatum 17.05.2001
EP-Offenlegungsdatum 24.10.2001
EP date of grant 02.02.2005
Veröffentlichungstag im Patentblatt 10.03.2005
IPC-Hauptklasse B41M 7/00
IPC-Nebenklasse B41M 5/00   

Beschreibung[en]

The invention relates to a method of providing a marking on a substrate which is provided with a coating obtained in a sol-gel process.

The provision of markings or images on the substrate mentioned above is often performed by means of tampon printing. The advantage of tampon printing is that inks of many colors can be used. Tampon printing provides a very wide freedom in the use of colors, while in addition it is a comparatively inexpensive process. A disadvantage is that tampon printing is an inflexible process as regards the shape of the substrate and of the image. The process can be used on substrates of planar shape, and also still of slightly curved shape. However, as soon as the substrate has a somewhat complicated three-dimensional shape, it becomes very difficult if not impossible to apply this process. Another method of applying markings or inscriptions involves the use of a laser. In laser marking, the laser can be controlled in any manner desired such that complicated surfaces can also be provided with markings. Laser marking is a flexible process in that respect. The freedom of choice of colors, however, is very limited in laser marking. Only few colors can be used owing to the limited number of pigments in the coloring agent. Laser marking is mostly used for providing technical inscriptions, such as the type number of a device.

From EP-A 0 775 596 a process in known for providing durable images by printing a pigmented aqueous ink onto a substrate bearing a hydrophilic thermoplastic polymer having cross-linking groups, then heating the printed image to encapsulate the pigment and cross-link the polymer.

From DE-A 198 12 072 an article having at least one surface layer on a substrate is known, the surface layer being obtained by coating a liquid composition of a chemical substance, such as a sol-gel material, onto the substrate. The composition is physically dried and chemically cured so that a dense but rough layer is obtained which is crosslinked to the substrate. The surface layer may be a marking layer which can be written upon.

It is an object of the invention to provide a method by which a marking is provided on a sol-gel coating of a substrate which affords a high degree of freedom in color choice, which method is flexible as regards its use on complicated shapes of the substrate and of the image, while the marking or image obtained has a high resistance to wear.

The invention is for this purpose characterized in that, after the provision of a layer of a sol-gel solution on the substrate, an ink compatible with the sol-gel is provided on said layer, which ink subsequently penetrates into the layer, whereupon finally the layer is cured so as to form a coating.

A layer of a sol-gel solution is provided on the substrate, for example by means of dip coating or spray coating. Then an ink is provided on the still somewhat moist sol-gel layer, which ink can penetrate into the sol-gel layer. So the ink does not remain on the surface of the sol-gel layer, but penetrates into it and after some time will lie entirely inside the sol-gel layer. The moment the ink is provided has an influence on the quality of the marking. If the ink is provided on a sol-gel layer which is too wet, the ink will flow out and a blurred image will be obtained. If the ink is provided after a too long waiting time, however, the ink will penetrate insufficiently into the sol-gel layer. It is found then after curing that the ink can be easily removed. The solvent of the sol-gel solution in the layer must have been sufficiently removed before the ink is provided, so that flowing-out of the ink is prevented as much as possible. Curing of the sol-gel layer converts the sol-gel layer into a polymer in a polymerization process. The marking has a high degree of wear resistance because the coloring agents or pigments are present entirely inside the layer. The wear resistance is much greater than in the case of tampon printing. The method is in fact suitable for inks of a wide variety of colors and can be implemented with various contactless spraying techniques, so that also 3D surfaces can be provided with images in a simple manner. Sol-gel solutions which are suitable for the provision of a marking or image in the manner described above are known from WO 98/13434 and WO 98/22548.

The sol-gel layer is preferably dried before the ink is provided. The optimum drying time is dependent on inter alia the type of sol-gel and the type of image. If the image has large, even surfaces, a longer drying time will be necessary than if the image comprises thin lines or dots. The drying time may be shorter in the case of drying at a higher temperature than at room temperature or in the case of forced drying (by air flow).

Preferably, the ink is provided in an ink jet process, for example, by a thermal ink jet technology, but a piezo ink jet technology is alternatively also possible. A normal spraying process could also be used.

Inks with organic coloring agents or pigments may be used. The advantage of organic inks is that they are readily available commercially. But inks containing inorganic pigments (pigment dispersions) may also be used. The choice depends on the type of sol-gel and accordingly on the application of the substrate. If it is designed for use at high temperatures, the sol-gel suitable for this will be cured at a high temperature, and inorganic pigments will have to be used for the dispersion. Organic pigments may preferably be used for lower temperatures. The inks or pigment dispersions may be water-based and/or alcohol-based, as long as they are compatible with the sol-gel.

The invention also relates to an implement with a wall portion formed by at least one substrate provided with a coating obtained by means of a sol-gel process in which a marking was provided in accordance with the method described above.

The invention will be explained with reference to embodiments.

Embodiment 1

This embodiment starts with a substrate made of polyamide (IXEF from the Solvay company) which may form part of a domestic appliance or a personal care appliance, such as an electric shaver, a toothbrush, etc. A sol-gel solution on the basis of TEOS (tetraethylorthosilicate) and GLYMO (3-glycidyloxypropyltrimethoxysilane) is provided on the substrate. The sol-gel layer has a thickness of approximately 10 µm. The ink used is a normal commercially available ink (for example from HP). The drying time at room temperature is approximately 20 minutes. Curing takes place at a temperature of approximately 160 °C. The image on the substrate showed a high wear resistance and was resistant to alcohol and MEK (methylethyl ketone).

Embodiment 2

This embodiment starts with an aluminum substrate such as may be used for the sole plate of an electric ion. The substrate should accordingly be suitable for use at elevated temperatures (350 °C). A sol-gel solution on the basis of TEOS (tetraethylorthosilicate) and MTMS (methyltrimethoxysilane) is provided on the aluminum substrate. The ink used is a water-based Fe2O3 pigment dispersion. The drying time at room temperature is approximately 20 minutes. The ink is provided by an ink jet technology. Curing takes place at a temperature of approximately 350 °C. The image obtained complies fully with the wear resistance requirements. The pigments in the image retain their color after exposure to high temperatures (350 °C) for long periods.


Anspruch[de]
  1. Verfahren zum Aufbringen einer Markierung auf einem Substrat, das mit einer in einem Sol-Gel-Prozess erhaltenen Beschichtung versehen ist, dadurch gekennzeichnet, dass nach dem Aufbringen einer Schicht aus einer Sol-Gel-Lösung auf dem Substrat eine mit dem Sol-Gel kompatible Tinte auf der genannten Schicht aufgebracht wird, welche Tinte nachfolgend in die Schicht eindringt, woraufhin schließlich die Schicht unter Bildung einer Beschichtung ausgehärtet wird.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Schicht zuvor getrocknet wird, bevor die Tinte aufgetragen wird.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Tinte mit Hilfe eines Tintenstrahlprozesses aufgebracht wird.
  4. Verfahren nach Anspruch 1, 2, oder 3, dadurch gekennzeichnet, dass die verwendete Tinte eine wasser- und/oder alkoholbasierte Tinte ist.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass organische oder anorganische Färbemittel oder Pigmente verwendet werden, um einen Farbeffekt zu erhalten.
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Sol-Gel-Lösung eine Lösung auf Basis von Tetraethylorthosilicat (TEOS) und 3-Glycidyloxypropyltrimethoxysilan (GLYMO) ist, die auf einem Polyamidsubstrat aufgebracht wird.
  7. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Sol-Gel-Lösung eine Lösung auf Basis von Tetraethylorthosilicat (TEOS) und Methyltrimethoxysilan (MTMS) ist, die auf einem Aluminiumsubstrat aufgebracht wird.
  8. Werkzeug mit einem Wandabschnitt, der von zumindest einem Substrat gebildet ist, das mit einer in einem Sol-Gel-Prozess erhaltenen Beschichtung versehen ist, in der mit einem Verfahren nach einem der vorhergehenden Ansprüche eine Markierung verschafft worden ist.
Anspruch[en]
  1. A method of providing a marking on a substrate which is provided with a coating obtained in a sol-gel process, characterized in that, after the provision of a layer of a sol-gel solution on the substrate, an ink compatible with the sol-gel is provided on said layer, which ink subsequently penetrates into the layer, whereupon finally the layer is cured so as to form a coating.
  2. A method as claimed in claim 1, characterized in that the layer is preliminarily dried before the ink is applied.
  3. A method as claimed in claim 1 or 2, characterized in that the ink is provided by means of an ink jet process.
  4. A method as claimed in claim 1, 2, or 3, characterized in that the ink used is a water-based and/or alcohol-based ink.
  5. A method as claimed in any one of the claims 1 to 4, characterized in that organic or inorganic coloring agents or pigments are used to obtain a color effect.
  6. A method as claimed in any one of the claims 1 to 5, characterized in that the sol-gel solution is a solution on the basis of tetraethylorthosilicate (TEOS) and 3-glycidyloxypropyltrimethoxysilane (GLYMO) which is provided on a polyamide substrate.
  7. A method as claimed in any one of the claims 1 to 5, characterized in that the sol-gel solution is a solution on the basis of tetraethylorthosilicate (TEOS) and methyltrimethoxysilane (MTMS) which is provided on an aluminum substrate.
  8. An implement having a wall portion formed by at least one substrate provided with a coating obtained in a sol-gel process in which a marking is provided by a method as claimed in any one of the preceding claims.
Anspruch[fr]
  1. Procédé pour appliquer un marquage sur un substrat qui est pourvu d'une couche de revêtement étant obtenue dans un processus de sol-gel, caractérisé en ce que, après l'application d'une couche constituée d'une solution de sol-gel sur le substrat, il est appliqué sur ladite couche une encre qui est compatible avec le sol-gel, laquelle encre pénètre ensuite dans la couche après quoi, finalement, la couche est durcie de manière à constituer une couche de revêtement.
  2. Procédé selon la revendication 1, caractérisé en ce que la couche est séchée préliminairement avant l'application de l'encre.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'encre est appliquée au moyen d'un processus à jet d'encre.
  4. Procédé selon la revendication 1, 2 ou 3, caractérisé en ce que l'encre qui est utilisée est une encre à base d'eau et/ou à base d'alcool.
  5. Procédé selon l'une quelconque des revendications précédentes 1 à 4,caractérisé en ce que des colorants ou des pigments organiques ou inorganiques sont utilisés pour obtenir un effet de couleur.
  6. Procédé selon l'une quelconque des revendications précédentes 1 à 5,caractérisé en ce que la solution de sol-gel est une solution à base d'orthosilicate tétraéthylé (TEOS) et à base de 3-glycidyloxypropyletriméthoxysilane (GLYMO) qui est appliquée sur un substrat en polyamide.
  7. Procédé selon l'une quelconque des revendications précédentes 1 à 5,caractérisé en ce que la solution de sol-gel est une solution à base d'orthosilicate tétraéthylé (TEOS) et à base de méthyletriméthoxysilane (MTMS) qui est appliquée sur un substrat en aluminium.
  8. Mise en oeuvre ayant une portion de paroi qui est formée par au moins un substrat étant pourvu d'une couche de revêtement qui est obtenue au moyen d'un processus de sol-gel où un marquage est appliqué selon un procédé comme revendiqué dans l'une quelconque des revendications précédentes 1 à 7.






IPC
A Täglicher Lebensbedarf
B Arbeitsverfahren; Transportieren
C Chemie; Hüttenwesen
D Textilien; Papier
E Bauwesen; Erdbohren; Bergbau
F Maschinenbau; Beleuchtung; Heizung; Waffen; Sprengen
G Physik
H Elektrotechnik

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