| abstract |
Procedure for the homopolymerization of vinyl aromatic monomers or for the copolymerization of vinyl aromatic monomers and dienes in the presence of at least one alkali metal compound and at least one compound of an element of group 3a of the Periodic System of the Elements, characterized in that the compounds, respectively referring to the sum of the molar equivalents of the alkali metal and of the elements of group 3a, a) contain from 0, 1 to 3, 9 molar equivalents of oxygen, sulfur, nitrogen or phosphorus and b) from 0 , 1 to 3, 9 molar equivalents of an organyl ligand. |