Patent ID: 7151147

Claim:
A process for producing polymerisates by the use of conjugated dienes and vinylaromatic compounds by anionic polymerization in an inert reaction medium in the presence of at least one lithium-organic compound, at least one dialkyl ether of the formula R 1 —O—CH 2 —CH(R 3 )—O—R 2 wherein R 1 and R 2 are independently of one another alkyl residues having a different number of carbon atoms, which are selected from the group of methyl-, ethyl-, n-, and iso-propyl, and n-, iso-, sec-, and tert-butyl, and wherein the total carbon atoms in the two alkyl residues R 1 and R 2 are 5 to 7, and R 3 represents hydrogen, a methyl- or an ethyl group, and at least one alkali-organic compound, wherein the alkali-organic compound is employed in quantities from greater 0.5 mol per mol of lithium in the lithium-organic compound and the alkali-organic compound is an alkali metal alcoholate of the formula M-OR, wherein R represents an alkyl group having 1 to 10 carbon atoms and M is sodium.