Polymers or copolymers of modified steric composition...

Details Polymers or copolymers of modified steric composition... Polymers or copolymers of modified steric composition...

C - Chemistry, Metallurgy

08

F

402/422, 252/51.

C08F 4/48 (2006.01) C08F 36/04 (2006.01)

Patent

CA 1061314

ABSTRACT OF THE DISCLOSURE Polymers of conjugated dienes and copolymers of con- jugated dienes with vinyl aromatic compounds or with other con- jugated diene a having a high content of trans-1,4 linkages and a low content of 1,2 or 3,4 linkages and an elastomeric character are prepared by use of a catalytic composition which comprises (a) an organo-lithium initiator and (b) a cocatalyst system comprising a compound of barium or strontium and an organometallic compound of a metal of Group IIB or IIIA of the Mendeleev periodic table of elements.

228556

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