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Ethylene and propylene polymerization by bis(indolyl)-coordinated titanium dichlorido complexes activated by modified methylaluminoxane

Polymer Journal volume 54, pages 223–227 (2022)Cite this article

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Abstract

Olefin polymerization reactions mediated by diamido-supported titanium complexes are a part of post-metallocene studies. In the present work, dichlorido{di(3-methylindol-2-yl)phenylmethane}titanium (1) and dichlorido{di(3-methylindol-2-yl)-2-methoxyphenylmethane}titanium (2) were applied for ethylene polymerization. The results showed that the 2/MMAO catalyst system, where MMAO is a modified methylaluminoxane, exhibits ethylene polymerization activity up to 2494 (kg of polyethylene)/(mol of Ti)·h·atm. This activity is comparable to the highest known activity in catalyst systems based on diamido-supported titanium complexes. The 2/MMAO system was also active for propylene polymerization (344 (kg of polypropylene)/(mol of Ti)·h·atm) to furnish atactic polypropylene.

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Acknowledgements

We thank Tosoh-Finechem Co., Ltd. for donating MMAO. The authors also gratefully acknowledge the Shared Facility Center for Science and Technology, Hirosaki University, for NMR measurements.

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Authors and Affiliations

  1. Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, Hirosaki, 036-8561, Japan

    Shun Ohta, Keigo Itoh & Masaaki Okazaki

  2. Department of Materials Science and Technology, Nagaoka University of Technology, Nagaoka, 940-2188, Japan

    Tomoyuki Toda

  3. Department of Materials Chemistry and Bioengineering, National Institute of Technology, Oyama College, Oyama, 323-0806, Japan

    Kei Nishii

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  1. Shun Ohta
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Correspondence to Shun Ohta.

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Ohta, S., Itoh, K., Toda, T. et al. Ethylene and propylene polymerization by bis(indolyl)-coordinated titanium dichlorido complexes activated by modified methylaluminoxane. Polym J 54, 223–227 (2022). https://doi.org/10.1038/s41428-021-00575-y

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