Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Patent
1991-08-14
1994-01-18
Smith, Edward J.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
502122, 502123, 502125, 502126, 526140, 526141, 526142, 526139, 526165, C08F 4649, C08F 1000
Patent
active
052800008
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a catalyst for olefin polymerization (homopolymerization olefin of 2 or more carbon atoms or copolymerization of two or more olefins of 2 or more carbon atoms), as well as to a process for producing an olefin polymer using said catalyst. More particularly, the present invention relates to a catalyst system comprising a transition metal compound having a particular structure and a aluminoxane, as well as to a process for producing a high molecular olefin polymer at a high efficiency by using said catalyst system.
BACKGROUND ART
Conventional processes for producing olefin polymers generally employ a catalyst system consisting of a solid titanium compound (composed mainly of titanium trichloride) and an organoaluminum compound, or a catalyst system comprising a solid which is titanium tetrachloride supported on magnesium chloride, an organoaluminum compound and an electron-donating compound. Also, there is proposed a process using a polymerization catalyst consisting of a cyclopentadienyl compound of titanium, zirconium or hafnium and an aluminoxane [e.g. Japanese Patent Application Kokai (Laid-Open) No. 19309/1983 (U.S. Pat. No. 4,542,199), Japanese Patent Application Kokai (Laid-Open) No. 217209/1985]. These processes using said polymerization catalysts are defective in that the olefin polymers, particularly, the propylene polymer obtained has a small molecular weight.
Meanwhile, a process for producing olefin polymers is proposed which uses, as part of the catalyst components, Ti(OR).sub.n X.sub.4-n and an aromatic hydrocarbon compound having at least 1 hydroxyl group (U.S. Pat. No. 4,525,556). The catalyst system used in this process, however, further requires, as other essential catalyst components, MgR.sub.2 and an inorganic or organic halogen compound and furthermore requires, as an organoaluminum compound, AlR.sub.n X.sub.n' (wherein R is a hydrocarbon group, X is halogen, n and n' are each a value of 0 to 3 and n+n'=3).
DISCLOSURE OF THE INVENTION
The object of the present invention is to solve the above mentioned problems and to provide a process for producing a high molecular olefin polymer with a high efficiency by using a novel catalyst system.
The present invention relates to
(1) a catalyst for olefin polymerization comprising:
a catalyst component (A) which is a transition metal compound represented by the general formula M(R).sub.l (OR').sub.m X.sub.n-(l+m) (wherein M represents a transition metal atom; R and R' each represents a hydrocarbon group of 1 to 20 carbon atoms; X represents a halogen atom; l, m and n represent numbers satisfying l.gtoreq.0, m>0 and n--(l+m).gtoreq.0; and n corresponds to the valency of the transition metal), and
a catalyst component (B) which is an aluminoxane obtained by the reaction of a trialkylaluminum and water, and
(2) a catalyst for olefin polymerization comprising:
a catalyst component (A) which is a transition metal compound represented by the general formula M(R).sub.l (OR').sub.m X.sub.n-(l+m) (wherein M represents a transition metal atom; R and R' each represents a hydrocarbon group of 1 to 20 carbon atoms; X represents a halogen atom; l, m and n represent numbers satisfying l.gtoreq.0, m>0 and n-(l+m).gtoreq.0; and n corresponds to the valency of the transition metal),
a catalyst component (B) which is an aluminoxane obtained by the reaction of a trialkylaluminum and water, and
a catalyst component (C) which is an organic compound having at least 2 hydroxyl groups, represented by the general formula (I), (II), (III), (IV), (V) or (VI) ##STR1## [wherein R" and R"' each represents a hydrocarbon group of 1 to 20 carbon atoms; Y represents a hydrocarbon group of 1 to 20 carbon atoms, --O--, --S--, --S--S--, ##STR2## (wherein R.sup.5 represents hydrogen or a hydrocarbon group of 1 to 6 carbon atoms); R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each represents a hydrocarbon group of 1 to 20 carbon atoms, a hydroxyl group, a nitro group, a nitrile group, a hydrocarbyloxy group or a halogen atom, and R.sup
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Kakugo Masahiro
Kawai Yoshio
Miyatake Tatsuya
Mizunuma Kooji
Shiga Akinobu
Smith Edward J.
Sumitomo Chemical Company Limited
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