Acidic monomer according to Formula I: in which A is a linear or branched aliphatic C 1 -C 18 -hydrocarbon group, which can be interrupted by one or more -O-, -S-, -COO-, -O-CO-NH-, -HN-CO-NH- or -CO-NR 1 -； R 1 is H or a C 1 -C 6 alkyl group； X is absent or is a linear or branched aliphatic C 1 -C 10 hydrocarbon group, which can be interrupted by one or more -O, -S-, -CO-O-, -O-CO-NH-, -HN-CO-NH- or -CO-NR 2 -； R 2 is H or a C 1 -C 6 alkyl group； PG is a radically polymerizable group, preferably vinyl, allyl, CH 2 =CR 3 -CO-Y- or R 4 O-CO-C(=CH 2 )-CH 2 -Y-； Y = O or NR 5 or is absent； R 3 is H or CH 3 ； R 4 is H or a C 1 -C 7 alkyl group； R 5 is H or a C 1 -C 7 alkyl group； n is 1, 2, 3 or 4； m = 1 or 2； p = 1, 2 or 3； and q = 1, 2 or 3. The monomers are particularly suitable as components of dental material.
