Radically polymerizable compound

A radically polymerizable compound of the formula I:

• (SG)xA((PEI)TG)m
• where
• SG=—COOR1, —SO3R1, —OPO3R12, or —PO3R12;
• R1=independently at each occurrence H, C1-C7 alkyl, or monovalent cation;
• x=1-60;
• A:
• hydrocarbon group having 1 to 30 carbon atoms and possibly containing silicon, halogen, nitrogen, phosphorus, oxygen, and sulfur;
• SK═H, C1-C20 alkyl, aryl, alkyl-aryl, —(CO)NR3R4, —(CS)NR3R4, —(CO)OR3, —(CO)R3, or —(SO2)R3;
• R3, R4=independently at each occurrence H, alkyl, aryl and/or alkyl-aryl, which may contain halogen, nitrogen, phosphorus, oxygen, and sulfur, or alkenyl;
• n=2-100;
• TG=H, —NR6R7, —OR6, —SR6, cycloalkenes, —CR6R7R8, —OCOR9, or —NR6COR9;
• R6, R7, R8═H, C1 to C20 alkyl, aryl and/or alkyl-aryl, which may contain halogen, nitrogen, phosphorus, oxygen, and sulfur;
• a radically polymerizable group which may contain halogen, nitrogen, phosphorus, oxygen, and sulfur;
• where R6 and R7, with inclusion of the nitrogen atom, may form a ring having 5 to 7 ring atoms and possibly containing heteroatoms;
• R9=alkyl, aryl, alkyl-aryl, or alkenyl;
• where PEI or TG comprises at least one radically polymerizable group;
• m=1, 2, or 3.