Living polymerization of ethylene with titanium complexes having two indolide-imine chelate ligands

被引：6

作者：

Matsugi, T ^{[1
]}

Kojoh, S ^{[1
]}

Fujita, T ^{[1
]}

Kashiwa, N ^{[1
]}

机构：

[1] Mitsui Chem Inc, R&D Ctr, Sodegaura, Chiba 2990265, Japan

来源：

KOBUNSHI RONBUNSHU | 2002年 / 59卷 / 06期

关键词：

ethylene living polymerization; indolide-imine chelate ligands; titanium complex; II Catalysts; monodisperse polymer;

D O I：

10.1295/koron.59.410

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Four titanium complexes bearing two unsymmetrical indolide-imine chelate ligands (named 11 Catalysts) were synthesized and investigated for their potential as ethylene polymerization catalysts using methylaluminoxane (MAO) as a cocatalyst. Three 11 Catalysts, with R = phenyl, 2,6-difluorophenyl, or 2,4,6-trifluorophenyl as an aryl group on the imine nitrogen, promoted room-temperature living ethylene polymerization to produce polyethylenes having extremely narrow molecular weight distributions (M-w/M-n: 1.11 similar to 1.14), displaying very high activities (TOF; 31 similar to 171 min(-1) (.) atm(-1)). The other II Catalyst, R-pentafluorophenyl, exhibited a very high activity of 1140 kg-PE/mol-cat (.) h (TOF; 677 min(-1) (.) atm(-1)), which is one of the highest activities for a titanium complex having no Cp ligands. It exhibited a high molecular weight value, M-w 323000, at room temperature.

引用

页码：410 / 414

页数：5

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