| abstract |
The present invention relates to the field of the protection of security documents, in particular banknotes, against premature detrimental influence of soil and/or moisture upon use and time. In particular, it relates radiation curable protective varnishes comprising one or more cationically curable compounds and one or more di-hydroxyl-terminated perfluoropolyether compounds of the general formula 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, wherein a and b independently are integers in a range between 0 and 50, wherein a + b≥ 1, and wherein c and d may be the same or different and are in the range of 1-20, and their uses for providing a protective coating or layer on a security document. |