Compounds of formula (I') wherein X is O, S or NR 0, X 0 is O or S, Y is O, S or a bond, - - is selected from the group consisting of formulae (B-1), (B-3), (B-8) and (B-9), R is at each occurrence independently selected from the group consisting of H, F, a linear or branched alkyl group having 1 to 4 C atoms or a linear or branched partially or fully fluorinated alkyl group having 1 to 4 C atoms, R' is at each occurrence independently selected from the group consisting of H, F, a linear or branched, non-halogenated, partially or completely halogenated alkyl group having 1 to 20 C atoms, a non-halogenated, partially or completely halogenated cycloalkyl group having 3 to 6 C atoms, a linear or branched, non-halogenated, partially or completely halogenated alkoxy group having 1 to 20 C atoms, a linear or branched, non-halogenated, partially or completely halogenated thioalkyl group having 1 to 20 C atoms, R 0 is at each occurrence independently selected from the group consisting of a linear or branched alkyl group having 1 to 10 C atoms or a cycloalkyl group having 3 to 6 C atoms, R 1 is a polymerizable group of formula, which is selected from alkenyl groups of formulae and -R 2 - is -(C 2) o -, or -(C 2) p -X 8 -(C 2) q -(X 9) s -(C 2) r -(X 10) t -(C 2) u -, wherein at least one R is F or a linear or branched partially or fully fluorinated alkyl group having 1 to 4 C atoms, or a cycloalkylene group having 5 or 6 C atoms which is substituted with at least one R which is F or a linear or branched partially or fully fluorinated alkyl group having 1 to 4 C atoms, o is selected from the group consisting of 1 to 20, X 8, X 9, X 10 are at each occurrence independently O, S or NR 0, s, t is 0 or 1, p, q are at each occurrence independently selected from the group consisting of 1 to 10, r, u are at each occurrence independently selected from the group consisting of 0 to 10, wherein the overall number of atoms for -(C 2) p -X 8 -(C 2) q -(X 9) s -(C 2) r -(X 10) t -(C 2) u - is up to 20 atoms, R 3, R 4, R 5, R 6 are at each occurrence independently R', R 7 is R'. X is O, S or NR 0, X 0 is O or S, Y is O, S or a bond, - - is selected from the group consisting of formulae (B-1), (B-3), (B-8) and (B-9), R is at each occurrence independently selected from the group consisting of H, F, a linear or branched alkyl group having 1 to 4 C atoms or a linear or branched partially or fully fluorinated alkyl group having 1 to 4 C atoms, R' is at each occurrence independently selected from the group consisting of H, F, a linear or branched, non-halogenated, partially or completely halogenated alkyl group having 1 to 20 C atoms, a non-halogenated, partially or completely halogenated cycloalkyl group having 3 to 6 C atoms, a linear or branched, non-halogenated, partially or completely halogenated alkoxy group having 1 to 20 C atoms, a linear or branched, non-halogenated, partially or completely halogenated thioalkyl group having 1 to 20 C atoms, R 0 is at each occurrence independently selected from the group consisting of a linear or branched alkyl group having 1 to 10 C atoms or a cycloalkyl group having 3 to 6 C atoms, R 1 is a polymerizable group of formula, which is selected from alkenyl groups of formulae and -R 2 - is -(C 2) o -, or -(C 2) p -X 8 -(C 2) q -(X 9) s -(C 2) r -(X 10) t -(C 2) u -, wherein at least one R is F or a linear or branched partially or fully fluorinated alkyl group having 1 to 4 C atoms, or a cycloalkylene group having 5 or 6 C atoms which is substituted with at least one R which is F or a linear or branched partially or fully fluorinated alkyl group having 1 to 4 C atoms, o is selected from the group consisting of 1 to 20, X 8, X 9, X 10 are at each occurrence independently O, S or NR 0, s, t is 0 or 1, p, q are at each occurrence independently selected from the group consisting of 1 to 10, r, u are at each occurrence independently selected from the group consisting of 0 to 10, wherein the overall number of atoms for -(C 2) p -X 8 -(C 2) q -(X 9) s -(C 2) r -(X 10) t -(C 2) u - is up to 20 atoms, R 3, R 4, R 5, R 6 are at each occurrence independently R', R 7 is R'.