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Preparation of spherical MgCl2 supported bis(imino)pyridyl iron(II) precatalyst for ethylene polymerization

✍ Scribed by Rubin Huang; Dongbing Liu; Shibo Wang; Bingquan Mao

Publisher
Elsevier Science
Year
2005
Tongue
English
Weight
293 KB
Volume
233
Category
Article
ISSN
1381-1169

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✦ Synopsis

The immobilization of the soluble precatalysts [(ArN C(Me)) 2 C 5 H 3 N]FeCl 2 , where Ar = 2,4,6-trimethylphenyl (A) or 2,6diisopropylphenyl (B), on supports derived from a spherical MgCl 2 -alcohol adduct yields active supported systems for ethylene polymerization. The activity of the supported catalysts and the resultant polymer properties are strongly dependent on the method of preparation. The highest activities are obtained using supports obtained by pretreatment of the MgCl 2 -alcohol adduct with triethylaluminium (TEA). In addition, it was found that precatalyst A, having less steric bulk at the ortho-aryl position of the ligand, gave higher activity than precatalyst B, in line with the different behaviours of these precatalysts in homogeneous polymerization, while precatalyst B gave polyethylene with lower polydispersity.

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## Abstract Summary: A new procedure was developed to support [(ArNC(Me))~2~C~5~H~3~N]FeCl~2~ (Ar2,4,6‐trimethylphenyl) on spherical MgCl~2~ for ethylene polymerization. The resultant catalysts showed ten times higher activity of the corresponding catalyst in homogeneous catalysis. The morphologi