Process for the polymerization of alpha-olefins or of their mixtures with minor amounts of ethylene, by means of catalysts comprising solid components or precursors of such components, in the form of microspheroidal particles
申请人:Montedison S.p.A.
公开号:EP0255790A1
公开(公告)日:1988-02-10
Polymers of alpha-olefins of formula:
R-CH=CH₂
wherein:
R = alkyl having from 1 to 6 C atoms,
or of their mixtures with minor amounts of ethylene are obtained by adopting catalysts comprising:
(A) a solid component obtained by treating
(a) an emulsion in a perfluoropolyether liquid of a liquid compound of magnesium, of titanium or of another transition metal, either liquid or in solution, with possibly using an electron-donor compound, with
(b) a reducing and/or halogenating agent capable of forming an insoluble solid product, after which, if such a product is a precursor of the catalytic component, it is treated with a tetravalent-titanium halide, or with a halide of another transition metal;
(B) an aluminum-alkyl compound;
(C) an outer electron-donor compound (c).
式中α-烯烃的聚合物:
R-CH=CH₂
其中
R = 具有 1 至 6 个 C 原子的烷基、
或它们与少量乙烯的混合物的聚合物,采用催化剂包括
(A) 通过处理以下物质获得的固体成分
(a) 全氟聚醚液体中的镁、钛或另一种过渡金属的液态化合物(液体或溶液)的乳 化液,可能使用电子供体化合物,与
(b) 能形成不溶性固体产物的还原剂和/或卤化剂,然后,如果该产物是催化元件的 前体,则用四价钛卤化物或另一种过渡金属的卤化物进行处理;
(B) 铝烷基化合物;
(C) 外电子供体化合物 (c)。