PROCESS FOR POLYMERIZING ALPHA-OLEFIN.

摘要

Alpha-olefins are polymerised in the presence of a catalyst obtd. by reacting (a) a highly active solid Mg, Ti and halogen contg. catalyst (pref. with a surface area of at least 3 square m/g); (b) an organometallic cpd. of a Group 1, 2 or 3 metal; (c) an organic halogen cpd. or a transition metal cpd.; (d) an organosilicon cpd. or a hindered amine. The components are reacted in an inert solvent in the absence of the alpha-olefin; or are reacted together with preliminary polymerisation of the olefin, in which case component (d) is optional. The ratio of Ti to halogen in (a) is pref. 5-200 (molar); the Ti:Mg ratio is pref. 2-100 molar. Component (b) is pref. an alkylaluminium or a dialkyl cpd. of a Group 2 metal. Component (c) is pref. a 1-20C hydrocarbon fluoride, chloride, bromide or iodide, or is an alkoxide or halide of Ti, Zr, Hf, V or Cr. Component (d) is pref. a silane, siloxane or silyl carbonate ester; or a hindered amine such as 2,2,6,6-tetramethylpiperidine or 2,2,5,5-tetramethylpiperidine. The molar ratio of (a):(b):(c):(d) is pref. 1:1-50:0.1-10:0.3-10. The alpha-olefin pref. has 2-10C and the catalyst is prepd. at 50-100 deg.C.