Asahi Kasei Kogyo Kabushiki Kaisha

Shigeo Tsuyama

Hisaya Sakurai

Tadashi Ikegami

Yoshihiko Katayama

Hideo Morita

Harumi Watanabe

Yukitoshi Iwashita

A method for producing a homopolymer or copolymer of an .alpha.-olefin is disclosed, wherein a specific catalyst is used, said catalyst comprising a solid catalyst component obtained by contacting, in the presence of a chlorinated hydrocarbon solvent, a titanium compound and an aromatic carboxylic ester with a solid component obtained by reacting a hydrocarbon solvent-soluble organomagnesium compound having an alkoxy group with a specified chlorosilane compound having an Si--H bond; an organoaluminum compound; and an alkoxysilane compound. By the method of the present invention, an .alpha.-olefin homopolymer or copolymer exhibiting high bulk density and stereoregularity can be efficiently produced under even such polymerization reaction conditions, that the polymerization temperature is high and the polymerization time is long.

Method for producing a homopolymer or copolymer of an .alpha.-olefin

An olefin polymerization catalyst which shows an extremely high activity even at low temperatures and is suited for the production of blow molding polymers, said catalyst comprising a solid component constituted by a chromium compound supported by an inorganic oxide carrier, and an organomagnesium complex compound soluble in the inert hydrocarbons and represented by the general formula: M.sub..alpha. Mg.sub..beta. R.sub.p.sup.1 R.sub.q.sup.2 R.sub.r.sup.3 X.sub.s Y.sub.t (wherein .alpha.&gt;0, .beta.&gt;0, p.gtoreq.0, q.gtoreq.0, r.gtoreq.0, s&gt;0, t.gtoreq.0, 0&lt;(s+t)/(.alpha.+.beta.).ltoreq.1.5 and p+q+r+s+t=m.alpha.+2.beta.; M is an atom selected from the group consisting of aluminum, zinc, boron, beryllium and lithium; m is the valence of M; R.sup.1, R.sup.2 and R.sup.3 may be same or different and represent respectively a hydrocarbon radical having 1 to 20 carbon atoms; X is OSiR.sup.5 R.sup.6 R.sup.7 ; and Y is a radical selected from the group consisting of OR.sup.4, OSiR.sup.5 R.sup.6 R.sup.7, NR.sup.8 R.sup.9 and SR.sup.10, wherein R.sup.5, R.sup.6, R.sup.7, R.sup.8 and R.sup.9 represent respectively a hydrocarbon radical or hydrogen atom, and R.sup.4 and R.sup.10 represent a hydrocarbon radical).

Olefin polymerization catalyst and olefin polymerization method using

Novel hydrocarbon-soluble isopropyl group-containing diorganomagnesium compounds and hydrocarbon solutions thereof are disclosed. The compound of the present invention has a high weight percent of Mg per one mol thereof, and the hydrocarbon solution of the present invention has a very low viscosity as compared with the conventional solutions. The hydrocarbon solution of the present invention can be prepared according any of various processes. If the reaction is carried out in an ether medium, the ether is substituted with a hydrocarbon solvent by removing the ether from the reaction mixture by distillation in the presence of the hydrocarbon solvent.

Hydrocarbon-soluble diorganomagnesium compounds, hydrocarbon solutions

A catalyst for preparing an .alpha.-olefin polymer having a broad molecular weight distribution and excellent physical properties, which comprises a solid catalyst component (A) and an organometal compound (B), the solid catalyst component (A) being obtained by reduction with an organomagnesium solution of the thermal decomposition solid product of special titanium compounds.

Catalyst for preparing polyethylene

A catalyst useful for polymerizing olefins, capable of providing an extremely high catalyst efficiency, excellent grain size and high bulk density of polymer; production of polymer having various molecular weight distributions from a broader range to a narrower range and controlling of die swell of formed polymer, by using a mechanical grinding and contacting means. Said catalyst shows a high activity and higher stereoregularity in the polymerization of polypropylene when it is used together with an electron donor compound. Said catalyst comprises a solid catalyst component (A) and an organometallic compound (B), said catalyst component (A) is obtained by reacting a specified organomagnesium component (i) with a specified chlorosilane compound (ii) and reacting and/or grinding-contacting the solid obtained by the reaction of (i) and (ii) with a titanium and/or vanadium compound containing at least one halogen atom. The organomagnesium component is of the formula

Growing community of inventors

Kurashiki, Japan

Shigeo Tsuyama