| abstract |
Homopolymers of conjugated dienes and copolymers of conjugated dienes with vinyl aromatic compounds or with other conjugated dienes having improved properties and an elastomeric character are prepared by use of a catalytic composition which comprises (a) an organo-lithium initiator and (b) a tercatalyst system comprising (b1) a compound of barium or strontium or calcium, (b2) an organometallic compound of a metal of Group 2B or 3A of the Mendeleev periodic table of elements and (b3) an alkali metal alcoholate ether or amine. |