Process for the production of polyolefins

摘要

A process for the production of polyolefins which comprises polymerizing or copolymerizing olefins in the presence of a catalyst composition which at least comprises: a catalyst component (I) resulting from mutual contact of sub-components (A) and (B), said sub-component (A) being of the formula R<1> pMe<1>X<1> 4-p and/or R<1> 2Me<1>X<1'> wherein Me<1> is a transition metal of the IVa Group in the Periodic Table, R<1> is either of cyclopentadienyl, substituted cyclopentadienyl, indenyl, substituted indenyl, fluorenyl and substituted fluorenyl groups which may be bonded through a C2-C18 hydrocarbon group and/or a silylene group, X<1> is a halogen atom, a hydrogen atom or a C1-C24 hydrocarbon group, p is an interger of 1≤p≤4, and X<1'> is a C1-C20 alkylidene group, and said sub-component (B) being a modified organoaluminum compound having Al-a-Al bonds; and a catalyst component (II) selected from the group of sub-components (C) and (E), said sub-component (C) being a transition metal elemental compound belonging to the IV-VIII Groups in the Periodic Table and selected specifically from the group consisting of oxides, halides, carbonates, acetates, alkoxides, acetylacetonates, metallocenes, hydrogen complexes, alkyl complexes, phosphine complexes, cyano complexes, pyridyl complexes and carbonyl complexes of said transition metal elemental compound, or a compound resulting from mutual contact of said transition metal elemental compound and a compound (D) of the formula Me'R'm(OR")nX'z-m-n wherein R' and R" each are a C1-C24 hydrocarbon group, X' is a halogen or hydrogen atom, Me' is an element of the I-III Groups in the Periodic Table, z is a valence of Me', m and n are 0