BOPI 12 BR/2023 REPERTOIRE NUMERIQUE 31 Fig. 1 ________________________________________ (11) 21302 Consulter le mémoire (51) B41M 3/14 (2018.01); C09D 11/03 (2018.01); C09D 11/037 (2018.01); C09D 11/101 (2018.01); C09D 11/106 (2018.01) ; C09D 11/50 (2018.01) (21) 1202300177 - PCT/EP2021/081155 (22) 09/11/2021 (30) EP n° 20206740.1 du 10/11/2020 (54) UV-VIS radiation curable security inks for producing dichroic security features. (72) VEYA, Patrick (CH); DEMARTIN MAEDER, Marlyse (CH); PITTET, Hervé (CH); GRIGORENKO, Nikolay (CH) et OSWALD, Andre (DE) (73) SICPA HOLDING SA, Avenue de Florissant 41, 1008 PRILLY (CH) (74) Cabinet NICO HALLE & CO. LAW FIRM, 1st Floor SHALOM Building, Ancienne Route, Opposite Pharmacie du Pont/Express Union, B.P. 4876, DOUALA (CM). (57) 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 RA is a C2-C4alkyl group substituted with a hydroxy group; the residue RB is selected from a C1-C4 alkyl group, and a C2C4alkyl group substituted with a hydroxy group; and Cat+ is a cation selected from the group consisting of Na+, K+, Cs+and Rb+. ________________________________________ (11) 21303 Consulter le mémoire (51) C09D 11/03 (2018.01); C09D 11/033 (2018.01); C09D 11/037 (2018.01); C09D 11/101 (2018.01); C09D 11/106 (2018.01) ; C09D 11/50 (2018.01) (21) 1202300178 - PCT/EP2021/081156 (22) 09/11/2021 (30) EP n° 20206794.8 du 10/11/2020 (54) UV-VIS radiation curable security inks for producing dichroic security features. (72) VEYA, Patrick (CH); DEMARTIN MAEDER, Marlyse (CH); PITTET, Hervé (CH); GRIGORENKO, Nikolay (CH) et OSWALD, Andre (DE) (73) SICPA HOLDING SA, Avenue de Florissant 41, 1008 PRILLY (CH) (74) Cabinet NICO HALLE & CO. LAW FIRM, 1st Floor SHALOM Building, Ancienne Route, Opposite Pharmacie du Pont/Express Union, B.P. 4876, DOUALA (CM). (57) 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
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