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Value document

A technology for valuable documents and parts, applied in the field of valuable documents, which can solve problems such as obstructing identification

Inactive Publication Date: 2004-06-02
GIESECKE & DEVRIENT CURRENCY TECHNOLOGY GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This hampers their identification and it is impractical to use several of said substances simultaneously

Method used

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Examples

Experimental program
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Effect test

example 1

[0123] To prepare the starting material for oxidative formation, the material that can be converted to an oxide is mixed with the chromophore in appropriate proportions according to formula (1), and then annealed, crushed, washed (eg, with water), dried and ground. The color base used can be Mn 2 o 3 , MnO, MnO 2 , MnCo 3 , MnCl 2 , KMnO 4 and organomanganese compounds. The weight fraction of color bases, based on the total mixture, can be up to 20% by weight. The annealing is carried out in the temperature range of 200-1700°C, and the holding time is 0.2-24 hours, but preferably at 300-500°C, and the holding time is 0.5-2 hours.

[0124] (1)6LiOH+As 2 o 5 +xMNCl 2 ? 2Li 3 AsO 4 :Mn+3H 2 O+xCl 2

[0125] In order to shift the equilibrium state in the direction of product formation, it can additionally be mixed with preferably 1-5% by weight of LiCO 3 Mixing, and additionally mixing with preferably 1-20% by weight LiOH for preparation.

example 2

[0127] Appropriate amount of sulfate (such as K 2 SO 4 ), or chromates (such as K 2 CrO 4 ) and an appropriate amount of dopant (such as Na 2 FeO 4 ) dissolved in alkaline medium. With up to 20% Na 2 FeO 4 doping. Evaporation of the solvent gave the product, which was ground for further use.

[0128] In addition, solid-state reactions can also be carried out. For this purpose, the K 2 SO 4 Grind with NaCl, and with Fe 3 o 4 Mix well. The mixture is annealed at a temperature of 700-1800°C. The product is reground for further use.

example 3

[0130] A variation of the procedure described in Example 2 was used to evaporate the solvent using a spray dryer. Alternatively, the alkaline medium may consist completely or partly of a silicate suspension (eg LUDOX  AS-40, DuPont). In this case, a silicate-encapsulated material is obtained after spray drying. Then an annealing process is performed at a temperature of 200-600 ° C to form SiO 2 protective layer and stabilizes the solubility of the substance in water. Alternatively, the material can be embedded in a polymer such as PMMA and processed into a foil material. The foil material is then cut into discs.

[0131] Other embodiments and advantages of the present invention can be referred to figure 2 Be explained.

[0132] figure 2 Represents a cross-section of a security element according to the invention.

[0133] figure 2 An embodiment of the security element of the present invention is represented. In this case, the security element consists of a label 2...

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PUM

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Abstract

The invention relates to a printed document of value having at least one authenticity feature in the form of a luminescent substance based on doped host lattices. The host lattice has a strong crystal field and is doped with at least one chromophore with the electron configuration (3d)2.

Description

technical field [0001] The invention relates to a printed value document having at least one authenticity element based on the incorporation of an electronic structure (3d) 2 The host lattice of chromophores forms the luminescent substance. Background technique [0002] According to the invention, the term "value document" refers to banknotes, cheques, share certificates, vouchers, identity cards, credit cards, passports and other documents, as well as labels, stamps, packaging or other elements for product protection. [0003] The use of luminescent substances to protect value documents from forgery has been known for a long time. The use of rare earth metals is also discussed in this context. The advantage of rare earth metals is that the characteristic spectral line bands are narrow, which is conducive to reliable detection and differentiation from other spectra. The substances used can absorb or emit outside the visible spectral region. [0004] If the emitted wavele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B42D25/30B41M3/14B42D15/00B42D15/10B42D25/378G07D7/12
CPCB42D15/0013B42D2035/40B42D25/387B41M3/144G07D7/12B42D25/29B42D25/30B42D25/378Y10T428/24934Y10T428/22Y10T428/24802
Inventor 托马斯·吉林雷纳·霍普弗里茨·施塔尔
Owner GIESECKE & DEVRIENT CURRENCY TECHNOLOGY GMBH
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