| 摘要 |
Substantially linear, stereoregular, vulcanizable, copolymers comprising units of butadiene and 2-phenyl-butadiene are made by copolymerizing a mixture of the monomers in the presence of a compound of a transition metal of Group IVa, Va, VIa or VIII of the Mendel</>eeff Periodic Table, and a reducing compound of a metal of Groups I, II or III. Other catalytic ingredients such as I2, AII3, BiI3 and MgO2/t may also be present. The transition metal compound may be TiCl4, TiI2Cl2, TiCl3, or Co(acetyl-acetone)2. The reducing compound may be AlHCl2.O(C2H5)2, AlHBrN(CH3)2, LiH, AlH2N(CH3N(CH3)2, AlH3.N(CH3)3, AlHI2.O (C2H5)2, AlHIN(CH3)2, Al(alkyl)3, or Al(C2H5)2I. The polymerization is effected in a hydrocarbon diluent. The copolymers are recovered by known techniques, and the product fractionated by extraction with methyl ethyl ketone. The butadiene units contain a major proportion of cis-1,4 units. |
