A variety of branched polyethylenes, spanning from semicrystalline LLDPE to completely amorphous, rubbery PE, was obtained from ethylene by homogeneous tandem catalysis using combinations of CoCl2(N2-BT) (1) (N2-BT = [1-(6-benzo[b]thiophen-2-yl-pyridin-2-yl)-ethylidlene)-( 2,6-diisopropyl-phenyl)-amine) and [(C5Me4)-SiMe2(tBuN)]TiCl2 (2) in the presence of MAO at 30 °C. The productivity reached a maximum of 4 570 kg PE (mol Ti x h)-1 at X(Co)=0.50, yielding a rubbery material with d25= 0.868 g x cm-3 and Tg=-55 °C.
Amorphous Polyethylene by Tandem Action of Cobalt and Titanium Single-Site Catalysts / C. BIANCHINI; M. FREDIANI; G. GIAMBASTIANI; W. KAMINSKY; A. MELI; E. PASSAGLIA. - In: MACROMOLECULAR RAPID COMMUNICATIONS. - ISSN 1022-1336. - STAMPA. - 26:(2005), pp. 1218-1223. [10.1002/marc.200500243]
Amorphous Polyethylene by Tandem Action of Cobalt and Titanium Single-Site Catalysts
FREDIANI, MARCO;G. GIAMBASTIANI;
2005
Abstract
A variety of branched polyethylenes, spanning from semicrystalline LLDPE to completely amorphous, rubbery PE, was obtained from ethylene by homogeneous tandem catalysis using combinations of CoCl2(N2-BT) (1) (N2-BT = [1-(6-benzo[b]thiophen-2-yl-pyridin-2-yl)-ethylidlene)-( 2,6-diisopropyl-phenyl)-amine) and [(C5Me4)-SiMe2(tBuN)]TiCl2 (2) in the presence of MAO at 30 °C. The productivity reached a maximum of 4 570 kg PE (mol Ti x h)-1 at X(Co)=0.50, yielding a rubbery material with d25= 0.868 g x cm-3 and Tg=-55 °C.
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