Nippon Oil Company

Mitsuji Miyoshi

Kazuo Matsuura

Nobuyuki Kuroda

Toru Nakamura

Takeichi Shiraishi

Mitsuo Matsuno

Yutaka Shikatani

Yoshio Tajima

Etsuo Kawamata

Masaomi Matsuzaki

A process for the homopolymerization or copolymerization of olefins is disclosed, which is carried out in the presence of a catalyst system comprising the combination of at least one organometallic compound with a transition metal compound supported on a solid carrier, said solid carrier being obtained by the reaction of (a) a magnesium halide, (b) a compound represented by the formula: Al(OR).sub.n X.sub.3-n, where R is a hydrocarbon residual group having 1 to 24 carbon atoms, X is a hydrogen atom, and n is 0&lt;n.ltoreq.3, and (c) a compound represented by the formula: Si(OR').sub.m X.sub.4-m, where R' is a hydrocarbon residual group having 1 to 20 carbon atoms, X is a halogen atom, and m is 0.ltoreq.m.ltoreq.4. The resulting polymers are characterized by a large bulk density and a narrow range of molecular weight distribution.

Process for producing polyolefins

A process for the homopolymerization or copolymerization of olefins is disclosed, which is carried out in the presence of a catalyst system comprising the combination of at least one organometallic compound with a component resulting from the reaction of (a) a magnesium halide, (b) a compound represented by the formula, Al(OR).sub.n X.sub.3-n, where R is a hydrocarbon residual group having 1 to 20 carbon atoms, X is a hydrogen atom, and n is 0.ltoreq.n.ltoreq.3, (c) a compound represented by the formula, Si(OR').sub.m X.sub.4-m, where R' is a hydrocarbon residual group having 1 to 20 carbon atoms, X is a halogen atom, and m is 0.ltoreq.m.ltoreq.4, and (d) a titanium compound and/or a vanadium compound. The resulting polymers have a large bulk density and a narrow range of molecular weight distribution.

Process for the production of polyolefins

According to this invention, there is provided a process for preparing polyolefins wherein olefins are polymerized or copolymerized using as catalyst a solid component and an organometallic compound, characterized in that said solid component is a substance obtained by the copulverization of:

Process for preparing polyolefins

According to this invention there is provided a process for polymerizing or copolymerizing olefins using a catalyst consisting of:

A process for the production of polyolefins using an improved catalyst which exhibits enhanced activity in the polymerization or copolymerization of olefins such that the yields of the polymers or copolymers are increased with a minimum catalyst residue remaining. The catalyst is produced by reacting a magnesium dihalide anhydride with an aluminum alkoxy compound to produce a carrier on which a titanium compound and/or a vanadium compound is applied. The molar ratio of magnesium dihalide to aluminum compound ranges between 1:0.001 to 1:20, and most effectively is in the range of 1:0.05 to 1:5.

An improved catalyst system is disclosed for use in the polymerization or copolymerization of olefins. The catalyst comprises a transition metal compound, an organometal compound and a composite carrier. This carrier is constituted by a SO.sub.3 treated alumina and a magnesium and/or a calcium compound. The polymerization or copolymerization of olefins such as ethylene, propylene and 1-butene is effected under conditions similar to those for reactions by means of Ziegler catalysts, but the resulting polyolefins have a wider molecular weight distribution, viz, a larger flow parameter as required for extrusion or blow molding.

A process for the production of polyolefins is disclosed, which is carried out in the presence of catalysts prepared according to the invention. The catalysts comprise a carrier resulting from the reaction of anhydrous magnesium halide, silicon tetrachloride and a compound represented by the general formula

Polymerization of olefins and catalysts therefor

A process for the production of polyolefins is disclosed, which is carried out in the presence of catalysts prepared according to the invention. The catalysts comprise a carrier resulting from the reaction of anhydrous magnesium halide, silicon tetrachloride and an alcohol represented by the general formula

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Naka, Japan

Mitsuji Miyoshi