BOPI 04 BR/2024 REPERTOIRE NUMERIQUE 33 Fig. 1 ________________________________________ (11) 21513 Consulter le mémoire (51) C09D 11/101 (2018.01); C09D 11/30 (2018.01); C09D 5/00 (2018.01) (21) 1202300480 - PCT/EP2022/065584 (22) 08/06/2022 (30) EP n° 21178128.1 du 08/06/2021 (54) Hybrid UV-led radiation curable protective varnishes for security documents. (72) VEYA, Patrick (CH); GARNIER, Jean (CH) et HOFSTETTER, Pierre-Yves (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 present invention relates to the technical field of varnishes for protecting security documents, such as banknotes, against premature detrimental influence of soil and/or moisture upon use and time. In particular, the present invention provides a hybrid UV-LED radiation curable protective vamish comprising: a) from about 60 wt-% to about 85 wt-% of either a cycloaliphatic epoxide, or a mixture of a cycloaliphatic epoxide and one or more cationically curable monomers other than the cycloaliphatic epoxide; b) from about 3 wt-% to about 15 wt-% of one or more radically curable monomers and/or oligomers; c) from about 1 wt-% to about 6 wt-% of a diaryl iodonium salt; d) from about 0.5 wt-% to about 3 wt-% of a free radical photoinitiator selected from the group consisting of alpha-hydroxyketones, alphaalkoxyketones, benzyl diketals, benzoin ethers, phosphine oxides, phenylglyoxylates, and mixtures thereof; e) from about 0.01 wt-% to about 5 wt-% of a non-ionic surfactant; and f) a photosensitizer of general formula (I) wherein the weight percents are based on the total weight of the hybrid UV-LED radiation curable protective varnish. General Formula (I) ________________________________________ (11) 21514 Consulter le mémoire (51) A61B 5/00 (2018.01) ; H04L 12/26 (2018.01) (21) 1202300493 (22) 04/12/2023
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