| 摘要 |
1,131,257. Polymerization catalysts for butadiene. SNAM S.p.A. 4 Nov., 1965 [3 Feb., 1965], No. 46885/65. Heading C3P. A polymerization catalyst comprises (a) a transition metal compound of a metal of Group IV to VIII of the Periodic System, (b) a linear aluminium polymeric compound containing repeating units of the formula where R is an aryl, alkyl, or cycloalkyl hydrocarbon radical, and (c) if component (a) is free from cobalt, iodine is present therein or is introduced in the form of aluminium iodide whilst if cobalt is present any aluminium halide can be present. Compound (b) may be made by reacting LiAlH 4 with the hydrochloride of a primary amine or by reacting a primary amine with an aluminium hydride. Compound (a) may be TiCl 3 , TiCl 4 , TiI 4 , VCl 3 , VCl 4 , TiI 2 Cl 2 , NiCl 2 , VOCl 3 , CoCl 2 , or cobalt acetylacetonate. The (c) compound may be AlI 3 , AlCl 3 , or AlBr 3 . In the examples the R in the (b) polymer is ethyl, n-butyl, and phenyl. The catalyst is used to polymerize butadiene in the presence of a hydrocarbon solvent. The polymer is recovered by conventional techniques. |
