[EN] PROCESS FOR THE PREPARATION OF METALLIC NANO-PARTICLE LAYERS AND THEIR USE FOR DECORA-TIVE OR SECURITY ELEMENTS<br/>[FR] PROCÉDÉ DE PRÉPARATION DE COUCHES DE NANOPARTICULES MÉTALLIQUES ET LEUR UTILISATION POUR DES ÉLÉMENTS DÉCORATIFS OU DE SÉCURITÉ
申请人:BASF SE
公开号:WO2019020682A1
公开(公告)日:2019-01-31
The present invention relates to a process for the preparation of thin silver nano-particles containing layers, which are produced directly on a substrate as part of a coating or printing process. The layers can show different colours in transmittance and reflectance. The invention further relates to decorative and security elements. When the layers are applied over a security element, such as a hologram, the obtained products may show different colours in reflection and transmission, an extremely bright optically variable image (OVD image). Depending on the thickness of the layer a more or less intensive metallic aspect appears.