BOPI 02 BR/2024 REPERTOIRE NUMERIQUE 30 Figure 1 ________________________________________ (11) 21413 Consulter le mémoire (51) C09D 11/101 (2018.01); C09D 11/30 (2018.01) ; C09D 5/00 (2018.01) (21) 1202300411 - PCT/EP2022/058310 (22) 29/03/2022 (30) EP n° 21166712.6 du 01/04/2021 (54) Cationic 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 cationic UV-LED radiation curable protective varnish comprising : a) from about 65 wt-% to about 90 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 1 wt-% to about 10 wt-% of a diaryl iodonium salt; c) from about 0.01 wt-% to about 5 wt-% of a nonionic surfactant; and d) a photosensitizer of general formula (I), wherein the weight percents are based on the total weight of the cationic UV-LED curable protective varnish, and a process for coating a security document with said cationic UV-LED radiation curable protective varnish. Formula I ________________________________________ (11) 21414 Consulter le mémoire (51) F23D 14/72 (2018.01) (21) 1202300433
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