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Polymerization of Styrene Versus Propylene with MgCl2-Supported Catalysts

  • Norio Kashiwa
  • Akinori Toyota
  • Junichi Yoshitake
Conference paper

Abstract

It is well known that MgCl2-supported TiC14 (MgC12/TiC14) catalyst in combination with A1Et3 shows much higher activity in propylene polymerization than the conventional TiC13 catalyst system,1 but the stereospecificity of the obtained polymer is rather low, namely 20–40% as isotactic index (I.I.). In a study of kinetics on short time polymerization,2 it was concluded that a cause of the low stereospecificity of this catalyst system was due to the high concentration of atactic active centers ([C*]ata = 14–58%). We also reported that a catalyst system composed of MgC12/TiC14/ethyl benzoate- A1Et3/ethyl benzoate showed very high stereospecificity in both propylene and styrene polymerization and the concentration of the isotactic active centers in both polymerizations was similar,3,4 ([C*]iso(PP)) = 1.3%, [C*]iso(St) = 3%, suggesting comparable isotactic active centers for both monomers.

Keywords

Catalyst System Polymerization Time Methyl Ethyl Ketone Cationic Polymerization Styrene Polymerization 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    N. Kashiwa, Polymer Journal, 12, 603 (1980).CrossRefGoogle Scholar
  2. 2.
    N. Kashiwa, J. Yoshitake, Makromol. Chem., Rapid Commun., 4, 41 (1983).CrossRefGoogle Scholar
  3. 3.
    N. Kashiwa, J. Yoshitake, Makromol. Chem., Rapid Commun., 3, 211 (1982).CrossRefGoogle Scholar
  4. 4.
    N. Kashiwa, J. Yoshitake, Polymer Bulletin, 11, 485 (1984).CrossRefGoogle Scholar
  5. 5.
    S. Murahashi, H. Yuki, K. Hatada, Kobunshikagaku, 22, 823 (1965).Google Scholar
  6. 6.
    N. Kashiwa, J. Yoshitake, Polymer Bulletin, 12, 99 (1984).Google Scholar
  7. 7.
    N. Kashiwa, Transition Metal Catalyzed Polymerizations, R. P. Quirk, Ed., Harwood Academic Publishers, New York, p. 379 (1981).Google Scholar

Copyright information

© Springer Science+Business Media New York 1987

Authors and Affiliations

  • Norio Kashiwa
    • 1
  • Akinori Toyota
    • 1
  • Junichi Yoshitake
    • 1
  1. 1.Mitsui Petrochemical Industries, Ltd.YamaguchiJapan

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