| abstract |
The present invention relates to the field of security documents, particularly the protection of banknotes, from the deleterious effects of pollutants and / or moisture at the time of use and over time. In particular, the present invention provides radiation curable protective varnishes comprising at least one cationically curable compound and at least one di-hydroxyl-terminated perfluoropolyether compound of the formula, and a protective coating or protective layer on the security document It relates to their use for: HO- (CH 2 CH 2 O ) c -CH 2 -CF 2 O- (CF 2 -CF 2 -O) a - (CF 2 O) b -CF 2 -CH 2 - (OCH 2 CH 2 ) d -OH, where a and b are independently integers ranging from 0 to 50, a + b ≥ 1, c and d may be the same or different and within the range of 1 to 20 have. |