Method for producing a security element having two security features and use of the method

Patent metadata

Field	Value
Publication number	US-2021237499-A1
Application number	US-201917053953-A
Country	US
Kind code	A1
Filing date	May 9, 2019
Priority date	May 9, 2018
Publication date	Aug 5, 2021
Grant date	—

Abstract

To simplify the production of a security element 300 with a first security feature 310 and a second security feature 320, the following method is proposed: (a) Provision of a light-sensitive film 200, which comprises at least one carrier layer 210 and in surface-to-surface contact with this a light-sensitive function layer 220; (b) Exposure of the light-sensitive film 200 at least area by area, with the formation of a pattern in the light-sensitive function layer 220, wherein the security element (300) is formed with a first security feature (310); (b′) Optional fixing of the exposed light-sensitive film; and (c) Printing of the carrier layer 210 and, as appropriate, of the protective layer 230, wherein a second security feature 320 is produced.

First claim

1 . A method for producing a security element, comprising the following method steps:
(a) providing a light-sensitive film, at least comprising at least one carrier layer and, in surface-to-surface contact with this, a light-sensitive function layer; and (b) exposing the light-sensitive film at least region by region with the formation of a pattern in the light-sensitive function layer, wherein the security element is formed with a first security feature; characterized in that the method additionally comprises the following method step: (c) printing on the carrier layers, wherein a second security feature is produced.

2 . The method according to claim 1 , wherein, after method step (b), a protective layer is applied on the side of the light-sensitive function layer which is opposite the carrier layer.

3 . The method according to claim 1 , wherein the method additionally comprises the following method step: (b′) fixing of the exposed light-sensitive film, which is performed between the method steps (b) and (c).

4 . The method according to claim 1 , wherein the method additionally comprises the following method step: (b′) fixing the light-sensitive film, which is performed after the method steps (b) and (c).

5 . The method according to claim 1 , wherein the light-sensitive film is a holography film and the first security feature is a volume hologram.

6 . The method according to claim 1 , wherein, after carrying out of the method step (c), the following further method steps are carried out:
(d) bringing together of the security element with at least one polymer layer to form a layer stack, and (e) laminating of the security element with the at least one polymer layer to form a value or security document.

7 . The method according to claim 6 , wherein the carrier layer of the security element in the layer stack is in contact with at least one polymer layer.

8 . The method according to claim 6 , wherein a polymer layer region in contact with the carrier layer of the value document or security document is formed from polycarbonate.

9 . The method according to claim 1 , wherein the carrier layer is formed from polycarbonate.

10 . The method according to claim 1 , wherein a printing ink used for the printing of the carrier layer is formed with a binding agent on the basis of a polycarbonate.

11 . The method according to claim 10 , wherein the polycarbonate of the printing ink is produced on the basis of a geminal disubstituted dihydroxydiphenyl cycloalkane with one or more polyols.

12 . (canceled)

13 . The method according to claim 7 , wherein a polymer layer region in contact with the carrier layer of the value document or security document is formed from polycarbonate.

14 . The method according to claim 8 , wherein the carrier layer is formed from polycarbonate.

15 . The method according to claim 14 , wherein a printing ink used for printing the carrier layer is formed with a binding agent based on polycarbonate.

16 . The method according to claim 15 , wherein the polycarbonate of the printing ink is produced on the basis of a geminal disubstituted dihydroxydiphenyl cycloalkane with one or more polyols.

17 . The method according to claim 3 , wherein the light-sensitive film is a holography film and the first security feature is a volume hologram.

18 . The method according to claim 4 , wherein the light-sensitive film is a holography film and the first security feature is a volume hologram.

19 . The method according to claim 3 , wherein, after carrying out of method step (c), the following further method steps are carried out:
(d) bringing together of the security element with at least one polymer layer to form a layer stack, and (e) laminating of the security element with the at least one polymer layer to form a value document or security document.

20 . The method according to claim 1 , wherein, after carrying out of method step (c), the following further method steps are carried out:
(d) bringing together of the security element with at least one polymer layer to form a layer stack, and (e) laminating of the security element with the at least one polymer layer to form a value document or security document.

21 . The method according to claim 19 , wherein the carrier layer of the security element in the layer stack is in contact with at least one polymer layer.

Assignees

• Covestro Deutschland Ag
• Covestro Intellectual Property Gmbh & Co Kg

Inventors

• Muth Oliver
• Kulikovska Olga
• Sauer Tatjana
• Fischer Jörg
• Mathea Arthur
• Peinze Franziska
• Orselli Enrico
• Rölle Thomas
• Hovestadt Wieland
• Pudleiner Heinz
• Hönel Dennis

Classifications

• B42D25/387

  absorbing or reflecting ultraviolet light · CPC title

• B42D25/382

  absorbing or reflecting infrared light · CPC title

• B42D25/337

  Guilloche patterns · CPC title

• B42D25/29 Primary

  Securities; Bank notes · CPC title

• B42D25/328 Primary

  Diffraction gratings; Holograms · CPC title