Merck Patent Gmbh

Other

Bundesdruckerei Gmbh

Burkhard Krietsch

Manfred Paeschke

Oliver Muth

Jakob Kuen

Matthias Kuntz

Frank Prissok

Reinhold Rueger

Rainer Linzmeier

Dieter Heinz

Ute Honeit

Andreas Walter

The present invention relates to intensely colored and/or optically variable pigments which have a flake-form transparent or semitransparent electrically conductive core and at least one coloring dielectric layer surrounding the core, to a process for the preparation of such pigments, and to the use thereof.

Intensely coloured and/or optically variable pigments having an electrically conductive core

The present invention relates to an optically variable security element for protecting articles against counterfeiting, to a process for the production of a security element of this type, and to the use thereof.

Optically variable security element

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.

Machine-readable security element for security products

The present invention relates to optically variable pigments of high electrical conductivity which comprise a flake-form substrate, which essentially consists of silicon dioxide and/or silicon oxide hydrate, and an electrically conductive layer surrounding the substrate, to a process for the preparation thereof, and to the use of pigments of this type.

Optically variable pigments of high electrical conductivity

The invention relates to a machine-readable security element for security products, containing at least one particulate substance that has electroluminescent properties and a transparent, electrically conductive pigment. Also disclosed are a printing ink for producing such a security element and a security product comprising said security element.

The invention relates to a flat dual security feature which comprises two different security components, one of which can be verified in the visible spectral region and one of which can be verified in the ultraviolet spectral region of light, and which comprises flake-form effect pigments and luminescent pigments in such a low concentration that the latter are evident to the naked eye as individual particles under the action of UV light; to a process for the production thereof, and to the use thereof.

Dual security mark

The present invention relates to laser-markable plastics, in particular thermoplastic polyurethanes, which are distinguished by the fact that they contain pigments having a coating of doped tin dioxide.

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Dieburg, Germany

Burkhard Krietsch