Self-etching dental materials based on (METH) acrylamide phosphates

Polymerizable dental material, which contains the following components:

• a) 0.5 to 95 wt.-% (meth)acrylamide phosphate according to Formula (I):
• in which
• R1 is H or CH3;
• R2 forms together with the nitrogen atom to which it is bonded and one or more atoms which belong to R3 or R3′ a heterocyclic ring;
• R3, R3′ independently of each other are a linear or branched aliphatic C1-C50 radical with a valency of m+n or p+n, an aromatic C6-C18 radical with a valency of m+n or p+n, or a cycloaliphatic, araliphatic or heterocyclic C3-C13 radical with a valency of m+n or p+n, wherein the carbon chains of the radical or radicals can be interrupted by O, S, CONR4, OCONH, or form together with one or more atoms which belong to R2 and the nitrogen atom to which R2 is bonded a heterocyclic ring, R3′ being H if p =0, and
• wherein
• R4 is H, C1-C10 alkyl, C6-C12 aryl, C6-C10 aralkyl or a bicylic C4-C12 radical;
• n is 1, 2, 3 or 4 if p=0, and is 1 or 2 if p≠0;
• m is 1, 2, 3 or 4;
• p is 0, 1, 2, 3 or 4;
• x is 0 or S;
• b) 0.01 to 15 wt.-% initiator,
• c) 0 to 80 wt.-% non-acid radically polymerizable monomer,
• d) 0 to 95 wt.-% solvent, and
• e) 0 to 20 wt.-% filler,
• said dental material having a pH of about 0.5 to 3.0, and being capable of etching a tooth substance,
• wherein the R3 heterocyclic ring is a ring with one nitrogen atom and 4 to 7 carbon atoms.