Yasuko T. Osano
Mitsubishi Chemical Corporation
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Featured researches published by Yasuko T. Osano.
Archive | 1999
Taku Kato; Hideshi Uchino; Naoshi Iwama; Kaori Imaeda; Masami Kashimoto; Yasuko T. Osano; Toshihiko Sugano
Novel ansa-zirconocenes characterized by a bis(indenyl) ansa ligand bridged between 4 and 4’ positions were synthesized. The behavior of these complexes as polymerization catalysts in the presence of methylalumoxane and properties of the polymers thus obtained were studied. Isotactic polypropylene was obtained by using C 2-symmetrical zirconocene. Especially, rac-Me2Si[4,4’-(3-methyl-1-phenylindenyl)2]ZrCl2 produced polypropylene with high tacticity, and a small amount of 3,1-type regiodefect. By the polymerization test with above complex at various propylene pressures, the depression of melting point of polymer was observed with decrease of monomer pressure, which seemed to be due to the lowering of isotacticity mainly. And by the plot of 1/P N versus 1/[propylene], we got a relatively large value of k TO/k P, and it is suggested that β-H transfer to propylene was not suppressed by substituent at 3 position effectively. Changing substituent at 3 position from methyl group to ethyl group resulted in increasing of molecular weight of polymer.
Journal of Organic Chemistry | 1996
Yuji Kubo; Sumio Tokita; Yuko Kojima; Yasuko T. Osano; Takao Matsuzaki
Chemistry Letters | 1998
Yasushi Yokoyama; Naoya Hosoda; Yasuko T. Osano; Chizuko Sasaki
Studies in Surface Science and Catalysis | 1999
Taku Kato; Hideshi Uchino; Naoshi Iwama; Yasuko T. Osano; Toshihiko Sugano
Organometallics | 2004
Naoshi Iwama; Hideshi Uchino; Yasuko T. Osano; Toshihiko Sugano
Chemistry Letters | 1989
Masahiro Tada; Masashi Nagai; Chieko Okumura; Yasuko T. Osano; Takao Matsuzaki
Organometallics | 2005
Naoshi Iwama; Yasuko T. Osano
Chemistry Letters | 2004
Yasushi Yokoyama; Yuko Kurimoto; Yasuyo Saito; Manabu Katsurada; Itaru Okada; Yasuko T. Osano; Chizuko Sasaki; Yayoi Yokoyama; Hideyuki Tukada; Masafumi Adachi; Shinichiro Nakamura; Tetsuo Murayama; Toshie Harazono; Tetsuya Kodaira
Bulletin of the Chemical Society of Japan | 2000
Yuko Kojima; Yasuko T. Osano; Toyoshi Ohashi
Journal of Imaging Science and Technology | 2003
Jin Mizuguchi; Hideki Yamakami; Yuko Kojima; Chiduko Sasaki; Yasuko T. Osano