# US 8,540,812 B2 · Machine-readable security element for security products

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- Number: US 8,540,812 B2
- Document ID: US8540812B2
- Status: Granted
- Kind: B2
- Application number: 13/204,268
- Filed: 2011-08-05
- Published: 2011-12-08
- Granted: 2013-09-24
- Earliest claimed: 2004-05-24
- Assignees: Merck Patent GmbH
- Applicants: Burkhard Krietsch; Matthias Kuntz; Oliver Muth; Manfred Paeschke; Jakob Kuen
- Inventors: Burkhard Krietsch; Matthias Kuntz; Oliver Muth; Manfred Paeschke; Jakob Kuen
- Web page: https://patentgrep.com/patent/US8540812B2

## CPC

- G07D 7/1205: Testing spectral properties
- B41M 3/144: {using fluorescent, luminescent or iridescent effects}
- B42D 25/29: Securities; Bank notes
- C09D 5/36: Pearl essence, e.g. coatings containing platelet-like pigments for pearl lustre
- C09D 11/037: characterised by the pigment
- C09D 17/004: {containing an inorganic pigment}
- Y10S 428/917: Electroluminescent
- Y10T 428/24802: Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T 428/24893: including particulate material
- Y10T 428/251: Mica
- Y10T 428/256: Heavy metal or aluminum or compound thereof
- Y10T 428/258: Alkali metal or alkaline earth metal or compound thereof
- G07D: HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P)
- B42D: BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The present invention relates to a machine-readable security element for security products which comprises at least one particulate substance having electroluminescent properties and a transparent, electrically conductive pigment, to a priming ink for the production of a security element of this type, and to a security product which includes the security element.

## Claims

### Claim 1

A printing ink for the production of a security element comprising:
at least one particulate substance having electroluminescent properties and a transparent, electrically conductive pigment, and
wherein the concentration of transparent, electrically conductive pigment is such that the formation of continuous conductivity in the resultant security element is prevented.

### Claim 2 (depends on 1)

The printing ink according to claim 1, further comprising at least one flake-form effect pigment and/or at least one organic or inorganic colored pigment.

### Claim 3 (depends on 1)

The printing ink according to claim 1, wherein said at least one particulate substance having electroluminescent properties is employed in said printing ink as a mixture of two or more different particulate substances having electroluminescent properties and said transparent, electrically conductive pigment is employed in said printing ink as a mixture of two or more different transparent, electrically conductive pigments.

### Claim 4 (depends on 3)

The printing ink according to claim 3, wherein said mixture of two or more different particulate substances having electroluminescent properties and said mixture of two or more different transparent, electrically conductive pigments form a pigment mixture, and said pigment mixture further comprises at least one binder.

### Claim 5 (depends on 4)

The printing ink according to claim 4, wherein said pigment mixture is in the form of pearlets, briquettes, pellets, granules, chips, sausages, a paste or a slurry.

### Claim 6 (depends on 1)

The printing ink according to claim 1, further comprising at least one binder.

### Claim 7 (depends on 6)

The printing according to claim 6, further comprising one or more solvents, adhesion promoters, dispersion aids, drying accelerators or photoinitiators.

### Claim 8 (depends on 2)

The printing ink according to claim 2, wherein said at least one particulate substance having electroluminescent properties is employed in said printing ink as a mixture of two or more different particulate substances having electroluminescent properties and said transparent, electrically conductive pigment is employed in said printing ink as a mixture of two or more different transparent, electrically conductive pigments.

### Claim 9 (depends on 8)

The printing ink according to claim 8, wherein said mixture of two or more different particulate substances having electroluminescent properties and said mixture of two or more different transparent, electrically conductive pigments form a pigment mixture, and said pigment mixture further comprises at least one binder.

### Claim 10 (depends on 9)

The printing ink according to claim 9, wherein said pigment mixture is in the form of pearlets, briquettes, pellets, granules, chips, sausages, a paste or a slurry.