Sicpa Holding Sa

Edgar M&uuml;ller

Olivier Rozumek

Anton Bleikolm

Philipp Egger

A solid marking composition comprises a solid matrix containing at least one type of optically variable interference pigment flakes. The solid marking composition provides a document or article with a copy and counterfeit protection feature, and is preferably used in a writing instrument for applying hand-written anti-counterfeit markings and signatures.

Solid marking composition as writing means, a writing instrument, an optically variable marking layer and use of a plurality of optically variable pigments

The invention describes luminescent optically variable pigments (OVP), methods for obtaining such pigments, as well as the use of such pigments as security elements in inks, coatings and articles. The luminescence centers are preferably incorporated into the dielectric material of the OVP's optical<i>Fabry-Perot</i> resonance cavity, allowing for the machine-discrimination of luminescent OVP from simple mixtures of luminescents and non-luminescent OVP.

PIGMENTS HAVING A VIEWING ANGLE DEPENDENT SHIFT OF COLOR, METHOD FOR PRODUCING SAID PIGMENTS, USE OF SAID PIGMENTS IN SECURITY APPLICATIONS, COATING COMPOSITION COMPRISING SAID PIGMENTS AND A DETECTING DEVICE

Inorganic sheets ( ) of at least two surperposed layers are provided with one or more symbols ( ) which have a size of between 1 and 10 &mgr;m. The inorganic sheet is made up into pigment flakes ( ). The symbols on the pigment flakes ( ) allow a tracing of compositions such as printing inks or paintings and of substrates carrying such compositions.

Inorganic sheet carrying symbols for making pigments

The present invention relates to coating compositions, preferably printing inks for security applications comprising at least one organic resin, at least one pigment and optionally at least one organic solvent. Said pigment comprises glass ceramic composite particles, containing at least one crystalline particle embedded in a glass matrix. Said glass ceramic particles have a particle size in the range of between 0.1 &mgr;m to 50 &mgr;m. Preferably active ions selected from the group of the rare-earth elements are incorporated into the crystalline phase of the composite to provide the glass ceramics with luminescent up- and down-converting characteristics. Glass ceramic luminescent have excellent physical and chemical stability. The glass matrix permits as well the stabilization of the photophysically interesting halide host crystals which have low phonon energies. Such materials provide unusual excitation and emission properties.

Coating composition, preferably printing ink for security applications, method for producing a coating composition and use of glass ceramics

An ink composition containing at least two different types of optically variable pigments which produce a film or coating having a viewing angle dependent color shift.

Ink composition comprising first and second optically variable pigments

The present invention relates to inorganic particles comprising at least two chemical elements in a predefined and analytically identifiable ratio. These particles are used as a marking means incorporated into or applied onto any desired article. They provide a high security potential against counterfeiting since the analysis depend on a combination of spatial as well as of chemical information. In a first step the information containing particle has to be localized by scanning electron microscopy and in a second step the ratio of elements is analysed using energy&mdash;or wavelength&mdash;dispersive X-ray analysis (SEM/EDX).

Growing community of inventors

Lausanne, Switzerland

Edgar Müller

Growing community of inventors

Lausanne, Switzerland

Edgar M&uuml;ller

Edgar Müller