| 摘要 |
Tri n-butyl tin hydride is prepared by reacting hexanormal butyl distannoxane (i.e. bis(tri-n-butyl tin) oxide) with methyl hydropolysiloxane and distilling the mixture under reduced pressure.ALSO:a -Olefines such as ethylene, propylene and butylene, olefines containing aromatic groups such as styrene, and conjugated dienes such as butadiene and isoprene may be homo- or copolymerized using a catalyst obtained by mixing a tin hydride compound of formula RmSnH4- m where m is 1, 2 or 3 and R is alkyl, cycloalkyl or aryl having up to 8 carbon atoms with a transition metal compound of a metal selected from Groups IVa, Va and VIa of the Mendeleef Periodic Table. The transition metal compound may be a halide, oxyhalide, alkoxide or acetylacetonate; it is preferably a chloride or an oxychloride. The catalyst components may be dissolved or suspended in an inert solvent and the mixing is preferably under an inert atmosphere. The molecular weight of the polymers may be regulated by polymerizing in the presence of hydrogen or a halogenated hydrocarbon such as ethyl bromide, n-butyl chloride and vinyl chloride. In the examples: (a) ethylene is polymerized using tri-n-butyl tin hydride and titanium tetrachloride or VOCl3 or triethyl tin hydride and TiCl4; (b) ethylene and propylene are copolymerized using tri-n-butyl tin hydride and TiCl4; (c) propylene is polymerized using tri-n-butyl tin hydride and TiCl4; (d) isoprene or styrene is polymerized using tri-n-butyl tin hydride and TiCl4; (e) ethylene is polymerized in the presence of ethyl bromide, isopropyl bromide, an aryl bromide or n-butyl chloride and the hydride, and (f) a mixture of ethylene and vinyl chloride is polymerized. |
