| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject catalyst for polymerization comprising a cobalt complex with coordinated phosphine ligand, capable of polymerizing many kinds of monomers and having a high catalytic activity. SOLUTION: This catalyst for polymerization comprises a cobalt complex with three coordinated phosphine ligands, pref. a complex of the formula, CH3 C (CH2 PPh2 )3 CoH(BH3 ) and is suitable for obtaining a polar polymer through homopolymerization of acrylonitrile or methacrylonitrile. The polar vinyl polymer is pref. obtained by polymerizing a polar vinyl monomer in a solventless state or in such an inert solvent as to be liquid while polymerization (e.g. opentane, hexane, etc.), at 0-80 deg.C for 0.5-100. The quantity consumed of the catalyst is 1×10<-4> -1×10<-2> mol, in terms of cobalt complex, per 1 mol polar vinyl monomer. The polymer is obtained in a yield <=60% and has a number average molecular weight of 1,000-1,000,000.
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