Method for identifying and / or authenticating a security item

Abstract

Method for identifying and / or authenticating a safety article. The invention relates to a method for identifying and / or authenticating a safety article, the method comprising searching for and / or analyzing (120), in at least a part of the safety article, one or more markers representative of the presence, content, and / or a morphological characteristic of a bio-based calcium carbonate filler, and determining the identity and / or authenticity (130) of the safety article based at least on a comparison of the marker(s) with one or more reference pieces of information. Figure for the abstract: Fig. 2

Claims

Claims

1. Method for identifying and / or authenticating a security article, the method comprising searching for and / or analyzing (120), in at least one part of the security article, one or more markers representative of the presence, content and / or a morphological characteristic of a calcium carbonate charge of biosourced origin and determining the identity and / or authenticity (130) of the security article based at least on the comparison of the marker(s) with one or more reference information.

2. Method according to claim 1, comprising, prior to the search and / or analysis (120) of the marker(s) representative of the presence and / or a morphological characteristic of the calcium carbonate charge of biosourced origin, the incineration (110) of at least part of the security article, in particular at a temperature less than or equal to 420°C, the search and / or analysis being carried out using the ashes resulting from the incineration.

3. Method according to claim 1 or 2, in which the marker(s) comprise a marker representative of the content of biosourced material, said marker being in particular the carbon isotope 14 load, the carbon isotope 14 load being determined according to standard ASTM D6866-22.

4. Method according to claim 3, in which the or at least one of the reference information comprises a content of biosourced material greater than 1%, better still greater than or equal to 2%, better still greater than or equal to 10%, even better still greater than or equal to 50% or greater than or equal to 90%.

5. Method according to any one of the preceding claims, in which the or at least one of the markers is representative of one or more morphological characteristics of the or part of the calcium carbonate load of biosourced origin.

6. Method according to any one of the preceding claims, in which the marker(s) comprises one or more markers representative of a stratified structure of calcium carbonate, characteristic of the morphological structure of calcium carbonate from shellfish, in particular the average density of strata and / or the average thickness of strata.

7. A method according to any preceding claim, in which the marker(s) comprise one or more markers representative of a porous and / or permeable structure, characteristic of the morphological structure of calcium carbonate from eggshells, in particular the porosity, the shape of the pores, the average size of the pores and / or the density of pores per unit area on a given plane.

8. Method according to any one of the preceding claims, comprising the search for and / or analysis of at least two markers, one being representative of the presence of calcium carbonate of biosourced origin, in particular being the presence and / or the content of carbon isotope 14, and the other being representative of a morphological characteristic of the charge of calcium carbonate of biosourced origin, in particular being the presence of a stratified or porous structure and / or morphological characteristics of the structure.

9. Method according to any one of the preceding claims, comprising the search for and / or analysis of one or more markers representative of a mixture of at least two types of morphologically different calcium carbonates of biosourced origin, in particular eggshells from different birds, shellfish from different molluscs or a mixture of eggshells of one or more types and shellfish of one or more types.

10. Method according to any one of the preceding claims, in which the step of searching for and / or analyzing the at least one part of the article comprises determining the presence of a bio-sourced calcium carbonate filler and searching for and / or analyzing a marker representative of the composition of the bio-sourced calcium carbonate filler, in particular the nature of the type(s) of calcium carbonate fillers in the composition of the bio-sourced calcium carbonate filler and its or their mass proportion in the composition of the bio-sourced calcium carbonate filler, and determining the identity or authenticity of the article comprises comparing the determined marker(s) with reference information and deducing an identity and / or authenticity of the article when there is a correspondence between the marker(s) and the reference information.

11. A method according to any preceding claim, additionally comprising investigating and / or analyzing the presence and / or mass proportion of a chemical compound present in the bio-sourced load, in particular magnesium, silicon, sodium, aluminum, or chlorine.

12. Method according to any one of the preceding claims, in which the security article is a security document, in particular a banknote, in particular made of paper and / or polymer, a packaging or overwrapping material, coated paper, a payment card, the part of the security article on which the search and / or analysis is carried out being in particular a security element integrated into the security document, in particular detachable, pre-cut or to be cut, or the security article is a security element, in particular integrated into a security document.

13. Security element (12) to be integrated into a security document (10), in particular suitable for implementing the method according to any one of the preceding claims, comprising at least one filler of calcium carbonate of biosourced origin.

14. Security element according to claim 13, in which the bio-sourced calcium carbonate filler comprises eggshell and / or shellfish powder, in particular at least one type of bio-sourced calcium carbonate, or a mixture of different types of bio-sourced calcium carbonate.

15. Security document (10), in particular suitable for implementing the identification and / or authentication method according to any one of claims 1 to 12, comprising a multi-layer structure comprising at least one internal layer of the security document comprising in mass a charge of calcium carbonate of biosourced origin and a surface protection layer.

16. Security document (10), in particular suitable for implementing the identification and / or authentication method according to any one of claims 1 to 12, comprising a surface layer and a print of an ink on the surface layer, the print and / or the surface layer comprising a calcium carbonate filler of biosourced origin, the printing ink, when it is aqueous, having a pH greater than or equal to 6, better still greater than or equal to 7.

17. Security document according to claim 15 or 16, in which the layer comprising the bio-sourced calcium carbonate filler comprises a mixture of a titanium dioxide filler and the bio-sourced calcium carbonate filler, the calcium carbonate filler being configured to form, with the titanium dioxide, an opacifying filler in the security document.

18. Security document according to any one of claims 15 to 17, in which the calcium carbonate filler of biosourced origin is integrated in mass in a layer comprising a synthetic hydrocarbon polymer derived at least partially from plant resources, also referred to as a biosourced polymer, in particular a biosourced latex.

19. Security document according to any one of claims 15 to 18, in which the calcium carbonate filler of biosourced origin is integrated in mass in a layer comprising a fibrous substrate comprising cellulose and / or hemicellulose fibers and / or vessels extracted from hardwoods, in particular from at least one of the following species: birch, hornbeam, chestnut, oak, eucalyptus, beech, sweetgum, nyssa, poplar, American tulip tree, preferably eucalyptus.

20. Security document according to any one of claims 15 to 19, in which the layer comprising the bio-sourced calcium carbonate filler comprises more than 1% by dry mass, better still more than 2% by dry mass, even better still more than 4% by dry mass, of bio-sourced calcium carbonate relative to the total mass of the dry matter of the internal layer.

21. Oily printing ink comprising a bio-sourced calcium carbonate filler.

22. Ink according to claim 21, the ink being a security ink forming, with the object on which it is printed, a security article suitable for implementing the identification and / or authentication method according to any one of claims 1 to 12.

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