Immobilization of Titanium Tetrachloride on Mixed Support of MgCl2 · xEB/Poly(methyl acrylate-co-1-octene): Catalyst for Synthesis of Broad MWD Polyethylene

Kaur, Sukhdeep; Singh, Gurmeet; Makwana, Umesh; Gupta, Virendra K.

doi:10.1007/s10562-009-0048-2

Cited by 11 publications

(6 citation statements)

References 42 publications

(44 reference statements)

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“…[10,[18][19][20][21][22] Also different support materials were blended together in order to generate different catalytically active sites producing polyethylenes with different chain length. [23] Numerous interactions between different catalytically sites and also between catalytically active sites, monomer, and hydrogen render MWD control rather difficult. Therefore the reactor blend compositions and the average molecular weights of the polyethylenes with different chain length depend on a great number of process parameters.…”

Section: Introductionmentioning

confidence: 99%

Mesoporous Silica Supported Multiple Single‐Site Catalysts and Polyethylene Reactor Blends with Tailor‐Made Trimodal and Ultra‐Broad Molecular Weight Distributions

Kurek

Mark

Enders

et al. 2010

Macromol. Rapid Commun.

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A ternary blend of the bisiminopyridine chromium (III) (Cr-1) with the bisiminopyridine iron (II) (Fe-2) post-metallocenes with the quinolylsilylcyclopentadienyl chromium (III) halfsandwich complex (Cr-3) was supported on mesoporous silica to produce novel multiple single-site catalysts and polyethylene reactor blends with tailor-made molecular weight distributions (MWDs). The preferred cosupporting sequence of this ternary blend on MAO-treated silica was Fe-2 followed by Cr-1 and Cr-3. Cosupporting does not impair the single-site nature of the blend components producing polyethylene fractions with $\overline M _{\rm w}$ = 10(4) g · mol(-1) on Cr-1, $\overline M _{\rm w}$ = 3 × 10(5) g · mol(-1) on Fe-2, and $\overline M _{\rm w}$ = 3 × 10(6) g · mol(-1) on Cr-3. As a function of the Fe-2/Cr-1/Cr-2 mixing ratio it is possible to control the weight ratio of these three polyethylenes without affecting the individual average molecular weights and narrow polydispersities of the three polyethylene fractions. Tailor-made polyethylene reactor blends with ultra-broad MWD and polydispersities varying between 10 and 420 were obtained. When the molar ratio of Fe-2/Cr-1 was constant, the ultra-high molecular polyethylene (UHMWPE, $\overline M _{\rm w}$ > 10(6) g · mol(-1) ) content was varied between 8 and 16 wt.-% as a function of the Cr-3 content without impairing the blend ratio of the other two polyethylene fractions and without sacrificing melt processability. When the molar ratio Fe-2/Cr-3 was constant, it was possible to selectively increase the content of the low molecular weight fraction by additional cosupporting of Cr-1. Due to the intimate mixing of low and ultra-high molecular weight polyethylenes (UHMPEs) produced on cosupported single-site catalysts a wide range of melt processable polyethylene reactor blends was obtained.

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Section: Introductionmentioning

confidence: 99%

Mesoporous Silica Supported Multiple Single‐Site Catalysts and Polyethylene Reactor Blends with Tailor‐Made Trimodal and Ultra‐Broad Molecular Weight Distributions

Kurek

Mark

Enders

et al. 2010

Macromol. Rapid Commun.

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“…Ziegler Natta polyolefin catalysts (ZN catalysts) are used to produce large volumes of polypropylene and polyethylene [1][2][3][4]. They are usually comprised of a titanium halide supported on magnesium compound with an organic compound known as an internal electron donor and support both regulates the morphology of catalyst [5,6], that play a vital role in manufacturing process of polymer, since it controls the molecular architecture of the final product [7][8]. Therefore polymer takes on shape and morphology of solid component of Ziegler Natta catalyst system which have characteristics influence on polymer properties such as bulk density, flow ability, particle adhesion etc [9].…”

Section: Introductionmentioning

confidence: 99%

Tuning of Ziegler Natta Catalyst using Emulsion Technique

Rani¹

2018

PPEJ

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“…This is an inorganic composite support. Kaur et al 17 synthesized an inorganic/ organic mixed support, which was MgCl 2 •xEB/poly(methyl acrylate-co-1-octene), and then TiCl 4 was immobilized on it.…”

Section: Introductionmentioning

confidence: 99%

Advanced Catalyst Technology for Broad/Bimodal Polyethylene, Achieved by Polymer-Coated Particles Supporting Hybrid Catalyst

Jiang

Yang

et al. 2013

Ind. Eng. Chem. Res.

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Polymer-coated particles were used to develop a novel catalyst technology for the production of broad/bimodal polyethylene in a single reactor. The methods for broad/bimodal polyethylene by catalyst technology, such as hybrid catalyst, composite support, and diffusion control, were combined together in this catalyst technology. An improved phase inversion method was used to fabricate poly[styrene-co-(acrylic acid)] (PSA) coated silica particles (SiO2/PSA). Core–shell structure was obviously observed in the resulting SiO2/PSA. SiO2/PSA showed a significant barrier effect to the diffusion of 1-hexene and n-hexane but no barrier effect to the diffusion of ethylene. This means the PSA layer has a selective barrier effect to the diffusion of small molecules. PSA-coated silica particles were used to support (n-BuCp)2ZrCl2/TiCl4, TiCl3/TiCl4, and Cp2ZrCl2/Fe based hybrid catalysts. The ethylene polymerization results indicated that the two different active sites can perform independently, and broad/bimodal polyethylene was obtained by all hybrid catalysts. The polydispersity index of the resulting polyethylene was as high as 18.13, even 44.5. The style of the activity profile was determined by whether the active sites in the core needed a cocatalyst or not.

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Immobilization of Titanium Tetrachloride on Mixed Support of MgCl2 · xEB/Poly(methyl acrylate-co-1-octene): Catalyst for Synthesis of Broad MWD Polyethylene

Cited by 11 publications

References 42 publications

Mesoporous Silica Supported Multiple Single‐Site Catalysts and Polyethylene Reactor Blends with Tailor‐Made Trimodal and Ultra‐Broad Molecular Weight Distributions

Mesoporous Silica Supported Multiple Single‐Site Catalysts and Polyethylene Reactor Blends with Tailor‐Made Trimodal and Ultra‐Broad Molecular Weight Distributions

Tuning of Ziegler Natta Catalyst using Emulsion Technique

Advanced Catalyst Technology for Broad/Bimodal Polyethylene, Achieved by Polymer-Coated Particles Supporting Hybrid Catalyst

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