BOPI 06 BR/2024 REPERTOIRE NUMERIQUE 14 (21) 1202300394 - PCT/EP2022/058389 (22) 30/03/2022 (30) EP n° 21166341.4 du 31/03/2021 (54) Methods for producing optical effect layers comprising magnetic or magnetizable pigment particles and exhibiting one or more indicia. (72) VEYA, Patrick (CH); GARNIER, Jean (CH); RUGGERONE, Riccardo (CH); PITTET, Hervé (CH) et MARTINI, Thibaut (CH) (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 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 (OELs) exhibiting one or more indicia (x30) on a substrate (x20), said method comprising a step of exposing a coating layer (x10) 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 (x10) and in the form of one or more indicia (x30), and a step of at least partially curing the coating layer (x10) and the one or more indicia (x30) with a curing unit (x50). Fig. 2A-1 ________________________________________ (11) 21557 Consulter le mémoire (51) E01F 13/00 (2019.01) ; E01F 15/00 (2019.01) (21) 1202300412 (22) 02/10/2023
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