C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/425, 402/426
C08F 4/50 (2006.01) C08F 4/48 (2006.01) C08F 36/04 (2006.01)
Patent
CA 1057732
ABSTRACT OF THE DISCLOSURE: The present invention relates to a process of polymerizing or copolymerizing conjugated dienes either with each other or with vinyl aromatic compounds having simultaneous- ly a high content of trans-1,3 linkages and a low content of 1,2 or 3,4 linkages, which comprises reacting the monomers in a reaction medium in the presence of an added catalytic composi- tion comprising an organo-lithium and a cocatalyst having one of the two following formulae Me[MR1R2R3R4]2, Me[M' (R1)4] wherein Me represents a metal of Group II A such as baryum, calcium, strontium, magnesium; M represents a metal of Group III A such as boron, aluminium, etc.; M' represents a metal of Group II B of the Mendeleev periodic table of elements, such as zinc; R1, R2, R3 represent an alkyl or aralkyl radical, and R4 represents an alkyl or aralkyl radical, or the group OR5 in which R5 represents an alkyl or aralkyl radical, and wherein the cocatalyst and the organolithium initiator are used in such quantities that the molar ratio gram atom of lithium/gram atom of a metal of Group II A is in the range of from 0.2 to 4.
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