Security printing liquid and method using nanoparticles

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 11/08 (2006.01) B41J 2/00 (2006.01) B41J 2/01 (2006.01) B41M 3/14 (2006.01) C09D 11/00 (2006.01)

Patent

CA 2468604

The invention relates to a printing method according to which, during the printing process, one or more narrow nozzles eject a printing liquid, and to a printing liquid suitable for such a method. The invention is particularly suitable for forgery-proof printing on papers or articles. According to the invention, the printing liquid contains nanoparticles that can be induced to fluoresce or phosphoresce. Said nanoparticles are small crystalline particles that can be induced to fluoresce or phosphoresce on their own or when mixed with dopants. Individual dots (10, 12) can be printed by means of a printing liquid that contains said nanoparticles. Due to their small size of from 1 to 1000 nanometers, preferably in the range of 300 nanometers or even much smaller depending on nozzle diameter, there is no risk of very narrow ink jet nozzles getting plugged. The induction and fluorescence emission frequency ranges are narrow-band so that for a security control of the print the respective wavelength-specific induction or detection is required, thereby increasing protection against forgery.

L'invention concerne un procédé d'impression selon lequel, pendant l'opération d'impression, un liquide d'impression jaillit par une buse étroite, et un liquide d'impression adapté à un tel procédé. L'invention concerne notamment une impression infalsifiable sur des papiers ou objets. Ce procédé d'impression et ce liquide d'impression sont caractérisés en ce que le liquide d'impression contient des nanoparticules excitables pour émettre la fluorescence ou la phosphorescence. Ces nanoparticules sont de petites particules cristallines qui peuvent, automatiquement ou lorsqu'elles sont mélangées à des dopants, émettre une fluorescence ou phosphorescence. Certains points (10, 12) peuvent être imprimés par un liquide d'impression contenant ces nanoparticules. En raison de leur petite taille de 1 à 1000 nanomètres, de préférence de l'ordre de 300 nanomètres ou beaucoup plus petit, en fonction du diamètre de buse, il y a risque d'obturation des buses à jets d'encre très étroites. Les plages de fréquences d'émission d'excitation et de fluorescence sont à bande étroite de telle manière que, pour une commande de sécurité de l'impression, l'excitation ou la détection spécifique aux longueurs d'ondes correspondante est nécessaire. La sécurité contre la falsification est ainsi accrue.

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