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Titolo:
Ethylene polymerization activity under practical conditions displayed by zirconium complexes having two phenoxy-imine chelate ligands
Autore:
Matsukawa, N; Matsui, S; Mitani, M; Saito, J; Tsuru, K; Kashiwa, N; Fujita, T;
Indirizzi:
Mitsui Chem Inc, R&D Ctr, Sodegaura, Chiba, Japan Mitsui Chem Inc Sodegaura Chiba Japan , R&D Ctr, Sodegaura, Chiba, Japan
Titolo Testata:
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
fascicolo: 1-2, volume: 169, anno: 2001,
pagine: 99 - 104
SICI:
1381-1169(20010328)169:1-2<99:EPAUPC>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
POST-METALLOCENES; CATALYSTS;
Keywords:
olefin polymerization catalyst; polyethylene; post-metallocene; phenoxy-imine ligand; zirconium; FI catalysts;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Fujita, T Mitsui Chem Inc, R&D Ctr, 580-32 Nagaura, Sodegaura, Chiba, Japan Mitsui Chem Inc 580-32 Nagaura Sodegaura Chiba Japan iba, Japan
Citazione:
N. Matsukawa et al., "Ethylene polymerization activity under practical conditions displayed by zirconium complexes having two phenoxy-imine chelate ligands", J MOL CAT A, 169(1-2), 2001, pp. 99-104

Abstract

Ethylene polymerization using zirconium complexes having two phenoxy-iminechelate ligands was investigated at 50 and 75 degreesC at 0.9 MPa ethylenepressure. The activity of the proto-catalyst, N-[(3-t-butylsalicylidene)anilinato]zirconium(IV)-dichloride (1), decreased by increasing the polymerization temperature (50 degreesC: 1192kg-PE/mmol-Zr.h, 75 degreesC: 209kg-PE/mmol-Zr.h). The introduction of an electron donating group, such as an n-hexyl and a methoxy group. on the imine nitrogen or at the para-position of phenoxy oxygen in a benzene ring suppressed the activity decrease, however, the activity at 75 degreesC was still lower than that at 50 degreesC. The combination of an n-hexyl or a cyclohexyl group on the imine nitrogen and a methoxy group at the para-position of the phenoxy oxygen enhanced activity at 75 degreesC. Thus, N-[(3-t-butyl-5-methoxysalicylidene)-n-hexylaminato] zirconium(Iv)dichloride (5) and N-[(3-t-butyl-5 -methoxysalicylidene)cyclohexylaminato] zirconium(Iv)dichloride (6) displayed activities of greater than 1000 kg-PE/mmol-Zr.h. Moreover, the introduction of an adamantyl or a cumyl group at the position adjacent to the phenoxy oxygen further increased the activity. N-[(3-Adamantyl-5-methoxysalicylidene)cyclohexylaminato]zirconium(IV)dichloride (7), N- [(3-cumyl-5-methoxysalicylidene)-n-hexylaminato]zirconium(IV)dichloride (8), and N-[(3-cumyl-5-methoxysalicylidene)cyclohexylaminato]zirconium(IV)dichloride (9) displayed exceptionally high activity(7: 3052 kg-PE/mmol-Zr.h, 8: 7078 kg-PE/mmol-Zr.h, 9: 7224kg-PE/mmol-Zr.h). (C) 2001 Published by Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 07:52:05