Ethylene polymerization behavior of new titanium complexes having two phenoxy-pyridine chelate ligands

Chemistry Letters

Volumn , Issue 10, 2001, Pages 1060-1061

  Inoue, Yoshihisa ^a   Nakano, Takashi ^a   Tanaka, Hidetsugu ^a   Kashiwa, Norio ^a   Fujita, Terunori ^a  

^a MITSUI CHEMICALS INC   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0035541361     PISSN: 03667022     EISSN: None     Source Type: Journal    
DOI: 10.1246/cl.2001.1060     Document Type: Article

References (28)

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19. B. M. Holligan, J. C. Jeffery, M. K. Norgett, E. Schatz, and M. D. Ward, J. Chem. Soc., Dalton Trans., 1992, 3345.
20. 1H NMR and FD-MS spectra, though reasonable elemental analysis data were not obtained because of impurities.
21. General polymerization procedure: Flow of ethylene gas (100 L/h) was charged into 250 mL of toluene at 25°C. To this solution, MAO (Albemarle MAO, 1.2 M toluene solution) and a toluene solution of a complex was added at the desired polymerization temperature. After the prescribed time, 25 mL of isobutyl alcohol was added to terminate the polymerization.
22. 3Al; 78 kg-PE/mol-cat·h (25°C), 252 kg-PE/mol-cat·h (75°C).
23. 0.7; R. Chiang, J. Polymer Sci., 36, 91 (1959). Intrinsic viscosity [η] was measured in decaline at 135°C using an Ubbelohde viscometer.
24. The polyethylenes formed with complexes 1 and 2 possess relatively broad molecular weight distributions (PDIs 4.45-8.67). These will be discussed in more detail in connection with the structures of active species in a future publication.
25. For all runs in Table 1, the polymer yield increased constantly with polymerization time, indicating that complexes 1 and 2 retain their catalytic activities for at least 30 min.
26. J. Strauch, T. H. Warren, G. Erker, R. Frohlich, and P. Saarenketo, Inorg. Chem. Acta., 300-302, 810 (2000).
27. On activation with MAO at 25°C, bis[N-(3-tert-butylsalicylidene)-phenylaminato]titanium(IV) dichloride displays about 100 times higher ethylene polymerization activity (3400 kg-PE/mol-cat·h) than the corresponding titanium complex having no t-Bu group ortho to the phenoxy group (38 kg-PE/mol-cat·h).
28. The titanium complexes potentially possess more than one active species since the complexes have two non-symmetric bidentate phenoxy-pyridine ligands.