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Method for preparing ethylene copolymer
| Details |
Inventors: Inoue, Norihide; Shiomura, Tetsunosuke; Kouno, Masahiro;
Assignee: Mitsui Toatsu Chemicals, Inc. (Tokyo, JP)
Primary Examiner: Delmendo; Romulo H.
Assistant Examiner:
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis
A method for preparing an ethylene copolymer which comprises the step of copolymerizing ethylene with an aromatic vinyl compound in the presence of a catalyst comprising (A) a specific transition metal compound represented by the formula I ##STR1## and (B) a cocatalyst such as an aluminoxane. |
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DETAILED DESCRIPTION What is claimed is: 1.
A method for preparing an ethylene copolymer which comprises the step of copolymerizing ethylene with an aromatic vinyl compound to obtain a random copolymer of ethylene and the aromatic vinyl compound that does not have an aromatic vinyl monomer-aromatic vinyl monomer chain, said copolymerizing being conducted in the presence of a catalyst comprising (A) a transition metal compound selected from the group consisting of ethylenebis(1-indenyl)zirconium dichloride, ethylenebis(tetrahydro-1-indenyl)zirconium dichloride, isopropylidene(cyclopentadienyl)(fluorenyl)zirconium dichloride, methylphenylmethylene(cyclopentadienyl)(fluorenyl)zirconium dichloride and diphenylmethylene(cyclopentadienyl)(fluorenyl)zirconium dichloride and (B) a cocatalyst.
2.
The method according to claim 1 wherein said cocatalyst is an aluminoxane.
3.
The method according to claim 2 wherein said aluminoxane is an aluminoxane having two or more kinds of alkyl groups.
4.
The method according to claim 2 wherein said aluminoxane is a fine particle aluminoxane.
5.
The method according to claim 1 wherein said cocatalyst is an aluminum oxycompound obtained by bringing an aluminoxane into contact with a compound having an active hydrogen.
6.
The method according to claim 1 wherein said cocatalyst is a compound which can stabilize a cationic transition metal complex.
7.
The method according to claim 1 wherein said cocatalyst is a compound showing Lewis acid properties.
8.
The method according to claim 1 wherein said catalyst is used in the presence of an organic aluminum compound.
9.
The method according to claim 8 wherein said catalyst comprising (A) and (B) is used in the presence of an organic aluminum compound which is represented by the formula (IV) R'.
sub.
j Al(OR").
sub.
k H.
sub.
l X.
sub.
m (IV) (wherein each of R' and R" is a hydrocarbon group having 1 to 20 carbon atoms, and R' and R" may be mutually identical or different; X is a halogen atom; j is an integer of from 1 to 3; each of k, l and m is 0, 1 and 2, and j+k+l+m=3)
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