Toward the bimodality of polyethylene, initiated with a mixture of a Ziegler–Natta and a metallocene/MAO catalyst system

López-Linares, Francisco; Díaz-Barrios, Antonio; Ortega, Heriberto; Matos, José Orlando; Joskowicz, Pablo; Agrifoglio, Giuseppe

doi:10.1016/s1381-1169(00)00204-1

Cited by 34 publications

(22 citation statements)

References 2 publications

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“…The supported catalysts produced polymers with higher M w than those obtained with the corresponding metallocene complexes. As expected, polymers with broader MWD values were obtained with the supported metallocenes, accordingly with the heterogeneous nature of these catalysts [13,44,45].…”

Section: Resultssupporting

confidence: 75%

Ethylene polymerization using metallocenes supported on MgCl2/SiCl4−n (n-C6H13O)n

Cérdán

Parada

Ibarra

et al. 2007

Designed Monomers and Polymers

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Abstract-Metallocene complexes Cp 2 TiCl 2 , Cp 2 ZrCl 2 , Cp 2 Zr(N n Bu 2 ) 2 , Cp 2 Ti(η 1 -OC(O)C 6 H 5 ) 2 and Cp 2 Zr(η 1 -OC(O)C 6 H 5 ) 2 were supported on MgCl 2 /SiCl 4−n (n-C 6 H 13 O) n carrier and used for ethylene polymerization. The supported complexes result in highly active catalysts when treated with different aluminum alkyl-based co-catalysts. These catalysts are able of tuning the final properties of the produced polyethylenes. Mixed composites of metallocenes and conventional Ziegler-Natta catalysts supported on the same carrier were also studied. A supported zirconocene Cp 2 Zr(η 1 -OC(O)C 6 H 5 ) 2 on MgCl 2 /SiCl 4−n (n-C 6 H 13 O) n resulted in a highly active catalyst that eject control on the molecular weight, crystallinity and morphology of the resultant polyethylene.

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Section: Resultssupporting

confidence: 75%

Ethylene polymerization using metallocenes supported on MgCl2/SiCl4−n (n-C6H13O)n

Cérdán

Parada

Ibarra

et al. 2007

Designed Monomers and Polymers

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“…[30] A major point with these catalysts is that some of them generate monomodal MWDs and others give independent catalyst performance, generating bimodal MWDs. An elegant demonstration of this fact was presented using mixtures of TiCl 4 /MgCl 2 INPETUS Ziegler-Natta catalyst with 3, 4, 6, 8 or CpZrCl 3 (26).…”

Section: Copolymerization Of Ethylene and A-olefinsmentioning

confidence: 99%

“…An elegant demonstration of this fact was presented using mixtures of TiCl 4 /MgCl 2 INPETUS Ziegler-Natta catalyst with 3, 4, 6, 8 or CpZrCl 3 (26). [30] The mixtures of this Ziegler-Natta catalyst with Cp 2 MCl 2 (where M = Ti, Zr or Hf) produced monomodal narrow MWD (between 2.6 and 2.9), but the mixture with 26 gave bimodal PE with MWD = 11 as a consequence of the appearance of two GPC peaks, one corresponding to the PE obtained with the Ziegler-Natta catalyst and the other one to the PE obtained with the metallocene. Another binary catalyst system was obtained using inorganic supports, such as MgCl 2 , SiO 2 , and their mixtures, as prepared via recrystallization or sol-gel procedures.…”

Section: Copolymerization Of Ethylene and A-olefinsmentioning

confidence: 99%

Recent Advances in Olefin Polymerization Using Binary Catalyst Systems

Souza

Casagrande

2001

Macromol. Rapid Commun.

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“…Control of molar mass, narrow molecular weight distributions and structural uniformity related to comonomer content are achieved through precise selection of reaction conditions. [18][19][20][21][22] In recent years, special attention has been devoted to the immobilization methodology of these catalyst systems either on organic or inorganic materials. Apart from using inorganic supports like magnesium chloride, silica, alumina, TiO 2 etc, polymeric support like pentaerythritol trimethacrylate, divinyl benzene, 2-hydroxyethyl methacrylate, styrene etc have been utilized for immobilization of metallocenes.…”

Section: Introductionmentioning

confidence: 99%

In situ synthesis of nanoclay filled polyethylene using polymer supported metallocene catalyst system

Murthy¹,

Parikh²,

Rajesh³

2011

Quím. Nova

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Recebido em 30/8/10; aceito em 4/3/11; publicado na web em 12/5/11In situ ethylene polymerizations were performed using bis(cyclopentadiene)titanium dichloride supported on polyethersulfone as catalyst. The bis(cyclopentadiene)titanium dichloride supported on polyethersulfone catalyst activity estimated by ethylene polymerization was 360 kgPE/molTi/h. During polymerization the fillers used were montmorillionite nanoclays having surface modifications with 35-45 wt% dimethyl dialkyl(14-18)amine (FA) and 25-30 wt% trimethyl stearyl ammonium (FB). These fillers were pretreated with methylaluminoxine (MAO; cocatalyst) for better dispersion onto the polymer matrix. The formation of polyethylene within the whole matrix was confirmed by FTIR studies. It was found that the nature of nanofiller did not have any remarkable effect on the melting characteristics of the polymer. TGA study indicates that nanoclay FB filled polyethylene has higher thermal stability than nanoclay FA filled polyethylene. The melting temperature of the obtained polyethylenes was 142 °C, which corresponds to that synthesized by the polyether sulfone supported catalyst.

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Toward the bimodality of polyethylene, initiated with a mixture of a Ziegler–Natta and a metallocene/MAO catalyst system

Cited by 34 publications

References 2 publications

Ethylene polymerization using metallocenes supported on MgCl2/SiCl4−n (n-C6H13O)n

Ethylene polymerization using metallocenes supported on MgCl2/SiCl4−n (n-C6H13O)n

Recent Advances in Olefin Polymerization Using Binary Catalyst Systems

In situ synthesis of nanoclay filled polyethylene using polymer supported metallocene catalyst system

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