Sicpa Holding Sa

Hervé Pittet

Patrick Veya

Marlyse Demartin Maeder

Andre Oswald

Nikolay Grigorenko

Michelle Richert

Thibaut Martini

Jean Garnier

Riccardo Ruggerone

The invention relates to the field of the protection of security documents such as for example banknotes and identity documents against counterfeit and illegal reproduction. In particular, the present invention provides methods for producing optical effect layers exhibiting one or more indicia on a substrate, said method comprising a step of exposing a coating layer comprising non-spherical magnetic or magnetizable pigment particles to a magnetic field of a magnetic-field generating device so as to orient at least a part of the magnetic or magnetizable pigment particles; a step of applying a top coating composition on top of the coating layer and in the form of one or more indicia, and a step of at least partially curing the coating layer and the one or more indicia with a curing unit.

Methods for producing optical effect layers comprising magnetic or magnetizable pigment particles and exhibiting one or more indicia

The present invention provides a UV-Vis radiation curable security ink for producing a security feature for securing value documents, wherein said security feature exhibits a blue color upon viewing in transmitted light and a metallic yellow color upon viewing in incident light. The UV-Vis radiation curable security ink comprises a cationically curable or a hybrid curable ink vehicle, and silver nanoplatelets bearing a surface stabilizing agent of general formula (I)

UV-VIS radiation curable security inks for producing dichroic security features

The present invention provides a UV-Vis radiation curable security ink for producing a security feature for securing value documents, wherein said security feature exhibits a blue color upon viewing in transmitted light and a metallic yellow color upon viewing in incident light. The UV-Vis radiation curable security ink comprises a cationically curable or a hybrid curable ink vehicle, and silver nanoplatelets bearing a surface stabilizing agent of general formula (I) wherein the residue Ris a C-Calkyl group substituted with a hydroxy group; the residue Ris selected from a C-Calkyl group, and a C-Calkyl group substituted with a hydroxy group; and Catis a cation selected from the group consisting of Na, K, Csand Rb.

UV-Vis radiation curable security inks for producing dichroic security features

The present invention provides a process for manufacturing a security feature for securing a value document, wherein said security feature exhibits a blue color upon viewing in transmitted light and a metallic yellow color upon viewing in Incident light. The manufacturing process comprises the following steps: a) printing a specific UV-Vis radiation curable ink on a transparent or partially transparent region of a substrate of a value document; b) heating the ink layer obtained at step a) at a temperature of about 55° C. to about 100° C. for at least one second so that the ink layer exhibits a metallic yellow color upon viewing in incident light; and c) UV-Vis curing the ink layer obtained at step b) to form the security feature. The manufacturing process according to the present invention enables the expedient production of security features exhibiting a blue color upon viewing in transmitted light and a metallic yellow color upon viewing in incident light and is particularly useful for industrial printing of value documents.

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Châtel-St-Denis, Switzerland

Hervé Pittet