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Propylene Polymerization with Bis(phenoxy-imine) Group-4 Catalysts Using iBu3Al/Ph3CB(C6F5)4 as a Cocatalyst

✍ Scribed by Junji Saito; Mitsuhiko Onda; Shigekazu Matsui; Makoto Mitani; Rieko Furuyama; Hidetsugu Tanaka; Terunori Fujita

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
130 KB
Volume
23
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

The catalytic behavior of three bis(phenoxy‐imine) group‐4 transition‐metal complexes (M = Ti, Zr, Hf), with ^i^Bu~3~Al/Ph~3~CB(C~6~F~5~)~4~ cocatalyst systems towards propylene polymerization was investigated under atmospheric pressure at 25 °C. The Ti complex produced ultrahigh‐molecular‐weight atactic poly(propylene), whereas Zr and Hf complexes formed high‐molecular‐weight isotactic poly(propylene)s via a site‐control mechanism. The isotactic poly(propylene) obtained with the Hf complex displayed a high melting temperature of 123.8 °C.
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Polymerization of propylene was conducted at 0 -150°C with the [ArN(CH2)3NAr]TiClz (Ar = 2,6-'Pr2C6H3) complex using a mixture of ~a l k y l a l u m i n i ~ (AIR3, R = methyl, ethyl and isobutyl) and Ph3CB(C&& as cocatalyst. When AlMe3 or AlEt3 was employed, atactic polypropylene (PP) was selectivel