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Titanium and vanadium based non‐metallocene catalysts for olefin polymerization
Author(s) -
Takaoki Kazuo,
Miyatake Tatsuya
Publication year - 2000
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200007)157:1<251::aid-masy251>3.0.co;2-5
Subject(s) - tacticity , vanadium , substituent , metallocene , titanium , olefin fiber , catalysis , polymer chemistry , polymerization , ligand (biochemistry) , ethylene , polymer , materials science , chelation , chemistry , organic chemistry , biochemistry , receptor
Titanium complexes with chelating 2,2'‐thiobis(4‐methyl‐6‐R‐phenoxy) ligand (R= CH 3 , i ‐C 3 H 7 , t ‐C 4 H 9 , Si( i ‐C 3 H 7 ) 3 ) ligands in combination with methylalumoxane, methylisobutylalumoxane or triisobutyl‐aluminum/(C 6 H 5 ) 3 CB(C 6 F 5 ) 4 as cocatalyst were highly active toward olefin, giving polymers with high molecular weight. Especially, titanium complexes having the most bulky substituent of Si( i ‐C 3 H 7 ) 3 showed the highest activity of ethylene polymerization. Vanadyl complexes with 2,2'‐thiobis(4‐methyl‐6‐ tert ‐butylphenoxy) ligand prepared by the reaction with VO(OC 4 H 9 ) 3 were also highly active to propylene, giving isotactic polypropylene with the melting temperature of 138°C.