Preparation of highly active Cr-catalysts for ethylene polymerization

Soga, Kazuo; Chen, Shian‐Ing; Shiono, Takeshi; Doi, Yoshiharu

doi:10.1016/0032-3861(85)90021-7

Cited by 4 publications

(5 citation statements)

References 2 publications

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“…The polyethylene (A) obtained without MgCl2 shows a very broad polydispersity (Q = 18.5) with a considerably low molecular weight, whereas the polyethylenes (B, C, D, and E) obtained with MgCl2 show narrow polydispersities (Q = 2) with high molecular weights. It should be noted that the polymers obtained at 4 on the polydispersity, which implies that the transfer reaction by AlEt2Cl is not dominant. Thus, the following two transfer reactions may be considered to be the main processes:…”

Section: Resultsmentioning

confidence: 97%

“…We have previously investigated the polymerization of ethylene and propylene with the homogeneous Cr(C17H35COO)3/AlEt2Cl catalyst system in toluene solvent. 6 The results obtained are summarized as follows: (1) The catalyst system shows some activity for ethylene polymerization (the best rate is 150 g of PE/(g of Cr-h)) but not for propylene polymerization.…”

Section: Resultsmentioning

confidence: 99%

“…The soluble Cr(C17H35COO)3/AlEt2Cl catalyst in toluene has shown some activity for ethylene polymerization. 6 We are thus encouraged to develop a catalyst for ethylene polymerization with enhanced activity by modifying the Cr(C17H35COO)3/AlEt2Cl system with suitable metal chlorides. Development of such an easy-to-handle catalytic system could be important for industrial applications.…”

Section: Introductionmentioning

confidence: 99%

“…Figure6. Relationship between stationary rate and electronegativity of the metal ion in the metal chloride.…”

mentioning

confidence: 99%

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Polymerization of ethylene and propylene with chromium tristearate/diethylaluminum chloride/metal chloride catalysts

Soga¹,

Chen²,

Doi³

et al. 1986

Macromolecules

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A CrtCnH^COOls/AlEtsCl/MgC^catalyst was prepared by modifying the Battelle-type catalyst with MgCl2 dissolved in 2-ethyl-l-hexanol (2-EHA), and the polymerization of ethylene was carried out in toluene at 20-40 °C. The rate of polymerization markedly increased with increasing Mg/Cr molar ratio. The polyethylene obtained without MgCl2 had a very broad polydispersity, whereas the polyethylenes in the presence of MgCl2 had extremely high molecular weights with narrow polydispersities. The polymerization of ethylene was also performed with various types of metal chlorides under similar conditions. The activity of the catalyst was strongly dependent upon the metal chloride used as modifier. A clear correlation was observed between the activity and the electronegativity of the metal ion in the metal chloride.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Figure6. Relationship between stationary rate and electronegativity of the metal ion in the metal chloride.…”

mentioning

confidence: 99%

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Polymerization of ethylene and propylene with chromium tristearate/diethylaluminum chloride/metal chloride catalysts

Soga¹,

Chen²,

Doi³

et al. 1986

Macromolecules

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“…[3,4] The chromium catalysts obtained by reacting chromium(III) acetate monohydrate (Cr(CH 3 COO) 3 N H 2 O) with acetic acid and acetic anhydride also showed extremely high activity for ethylene homopolymerization with diethylaluminium chloride (DEAC) as cocatalyst. [5][6][7] The polymerization activity of this catalyst was significantly improved by the use of a suitable metal chloride, such as magnesium dichloride (MgCl 2 ) [8,9] as catalyst support. The MgCl 2 -supported chromium(III) stearate (Cr(C 17 H 35 COO) 3 )-DEAC catalyst system produced poly(propylene) with ca.…”

Section: Introductionmentioning

confidence: 99%