| 摘要 |
High cis-1,4-diene polymers are prepd. by polymerising a 1,3-diene monomer in a hydrocarbon solvent in the presence of a catalyst compsn. comprising (a) a carboxylated Ni or Co oxyborate of formula (RCOO-M-O)2BOR', or more pref. (RCOO-M-O)3B (where R, R' = 7-17 (pref. 7-11) C alkyl; M = Ni or Co); (b) an organometallic cpd. of Gp. I, II or III metals; and (c) a F-contg. cpd. from BF3 complexes with ethers and/or alcohols, and HF and its complexes with ethers and/or alcohols. - Pref. polymers are from butadiene (BD) and have 90-99% cis-1,4 content. Pref. (b) is an organo-Al, -Li, -Mg, or -Zn cpd. (esp. triisobutyl aluminium (TIBAL) or n-butyl lithium); and (c) is a BF3 complex with an ether (esp. with diethyl ether), or an alcohol (esp. ethanol or octanol). - Polymerisation is carried out in a hydrocarbon solvent (esp. hexane) at -10 to 150 (esp. 50-130) deg.C, using molar proportions of catalyst components (a):(b):(c) 1:1:1 - 1:70:70 (esp. 1:1.5:1.5 ; 1:15:15).
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