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
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
收藏
页码:410 / 414
页数:5
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