TREA

Method for preparing ethylene copolymer

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Information

  • Patent Grant
  • 5652315
  • Patent Number
    5,652,315
  • Date Filed
    Friday, June 14, 1996
    28 years ago
  • Date Issued
    Tuesday, July 29, 1997
    26 years ago
Information
Abstract
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.
Description
Claims
  • 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).
  • 10. The method according to claim 9 wherein said organic aluminum compound represented by the formula IV is triethyl aluminum or triisobutyl aluminum.
  • 11. The method according to claim 1 wherein said aromatic vinyl compound is styrene, o-methylstyrene, p-methylstyrene, o,p-dimethylstyrene, o-ethylstyrene, m-ethylstyrene, p-ethylstyrene, o-chlorostyrene, p-chlorostyrene or .alpha.-methylstyrene.
  • 12. The method according to claim 1 wherein polymerization temperature is in the range of from -100 to 200.degree. C. and polymerization pressure is in the range of from atmospheric pressure to 100 kg/cm.sup.2.
  • 13. The method according to claim 2 wherein said aluminoxane is a compound represented by the formula II or III ##STR3## wherein R is a hydrocarbon group having 1 to 10 carbon atoms, and n is an integer of 2-100.
Priority Claims (1)
Number Date Country Kind
4-143941 Jun 1992 JPX
Parent Case Info

This application is a continuation of application Ser. No. 08/443,392, filed May 17, 1995, now abandoned, which is a continuation of application Ser. No. 08/068,086, filed on May 28, 1993 now abandoned.

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Entry
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Zambelli et al., "Isotactic Polymerization of Propene:Homogeneous Catalysts Based on Group 4 Metallocenes without Methylalunoxane," ACS, Macromolecules, pp. 2186-2189 (1989).
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Continuations (2)
Number Date Country
Parent 443392 May 1995
Parent 68086 May 1993