| 摘要 |
A process for the polymerization of alphaolefins having at least three carbon atoms, using a catalyst containing titanium, magnesium, aluminium and halogen. The catalyst employed comprises, according to the invention, the reaction product of (A) an addition and/or substitution product of an electron donor compound (Lewis base) with an aluminium alkyl, with (B) a compound and/or composition in which the atomic ration of halogen/magnesium is at least 1:1, which compound and/ or composition is either (I) obtained by contacting (a1) a halogen-containing titanium compound with the product of reaction between (a2) a magnesium alcoholate of the formula XMgOR, where R is an alkyl, cycloalkyl or aryl radical containing up to 20 carbon atoms and X is a halogen atom, R or OR, or a magnesium salt of a saturated or unsaturated carboxylic acid, or a magnesium enolate, and (a3) aluminium halides of the formula AlRnX3-n, in which R and X are as defined above, and n is 0,1 or 2, or (II) a reaction product of (b1) aluminium halides or alkylhalides or alkyls of the formula AlRmX3-m, in which R and X are as defined above, and m is 0,1,2 or 3, with the product of reaction between a magnesium compound as defined above under(a2) or (b2) a halide or oxyhalide of magnesium with (b3) a titanium alcoholate. |
