Synthesis of low molecular weight polyethylene waxes by a titanium BINOLate–ethylaluminum sesquichloride catalyst system

Umare, Prashant S.; Antony, R.; Gopalakrishnan, K.; Tembe, Gopal L.; Trivedi, Bhavna

doi:10.1016/j.molcata.2005.06.067

Cited by 23 publications

(17 citation statements)

References 59 publications

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“…35 -40 In a recent finding we reported that titanium complexes of 1,1 -bi-2-aryl oxide, such as BINOL (1,1 -binaphthalene-2,2 -diol), which is an important c 2 symmetric chiral auxiliary ligand, promoted the polymerization of ethylene to predominantly low-molecular-weight product having high crystallinity and narrow polydispersity. 41 In order to gain further insight into the interesting behavior of bulky aryloxy derivatives of Ti(IV) in polymerization, in the present work, catalyst precursors containing sterically bulky phenols have been prepared and evaluated for catalytic ethylene polymerization in combination with ethyl aluminum sesquichloride as co-catalyst.…”

Section: Materials Nanoscience and Catalysismentioning

confidence: 99%

Synthesis of ultra‐low‐molecular‐weight polyethylene wax using a bulky Ti(IV) aryloxide–alkyl aluminum catalytic system

Umare¹,

Tiwari²,

Antony³

et al. 2007

Applied Organom Chemis

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Complexes of titanium(IV) with bulky phenolic ligands such as 2-tert-butyl-4 methylphenol, 2, 4-di-tert-butyl phenol and 3,5-di-tert-butyl phenol were prepared and characterized. These catalyst precursors, formulated as [Ti(OPh * ) n (OPr i ) 4−n ] (OPh * = substituted phenol), were found to be active in polymerization of ethylene at higher temperatures in combination with ethylaluminum sesquichloride (Et 3 Al 2 Cl 3 ) as co-catalyst. It was observed that the reaction temperature and ethylene pressure had a pronounced effect on polymerization and the molecular weight of polyethylene obtained. In addition, this catalytic system predominantly produced linear, crystalline ultra-lowmolecular-weight polyethylenes narrow dispersities. The polyethylene waxes obtained with this catalytic system exhibit unique properties that have potential applications in surface coating and adhesive formulations.

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Section: Materials Nanoscience and Catalysismentioning

confidence: 99%

Synthesis of ultra‐low‐molecular‐weight polyethylene wax using a bulky Ti(IV) aryloxide–alkyl aluminum catalytic system

Umare¹,

Tiwari²,

Antony³

et al. 2007

Applied Organom Chemis

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“…In a previous work, we showed that under optimum conditions it is possible to oligomerize ethylene to linear a-olefins using Ti(IV) aryloxo complexes of monodentate phenols of the type M(OR) 4 in the presence of alkylaluminum halide co-catalysts other than MAO (23). In a recent finding, we reported that Titanium complexes of 1,1 0 bi-2-aryl oxide, such as BINOL (1,1 0 -binaphthalene 2,2 0 -diol) which is an important c 2 symmetric chiral auxiliary ligand, promoted the polymerization of ethylene to a predominantly low molecular weight product having high crystallinity and narrow polydispersity (24). In order to gain further insight into the interesting behavior of aryloxy derivatives of Ti(IV) in polymerization, in the present work, a broad group of catalyst precursors containing unsubstituted bi and mono phenols have been prepared and evaluated for catalytic ethylene polymerization in combination with ethyl aluminum sesquichloride as co-catalyst.…”

Section: Introductionmentioning

confidence: 99%

Polyethylene Waxes: Catalytic Synthesis by Ti‐Biphenolates

Umare

Rao

Tembe

et al. 2007

Journal of Macromolecular Science, Part A

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Soluble complexes of Ti (IV) bearing biphenol groups such as 1,1 0 -binaphthelene 2, 2 0 diol (Binol), 1,1 0 -methylene di-2-naphthol, biphenol were prepared and characterized. These catalyst precursors formulated as [Ti(O-O)(OPr i )Cl] are found to be active in polymerization of ethylene at high temperatures in combination with ethylaluminum sesquichloride (Et 3 Al 2 Cl 3 ) as co-catalyst. The ultra low-molecular weight polyethylenes are linear, crystalline and display narrow polydispersities. The PE waxes obtained with this catalytic system exhibit unique properties that have potential applications in surface coating and adhesive formulations.

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“…However, systematic work on the application of non-metallocene based Ti catalysts is lacking [7]. Continuing our earlier work on novel homogeneous titanium catalysts for polyolefin synthesis [8], we report herein the synthesis of titanasilsesquioxanes based on trisilanol isooctyl 7 Si 7 O 9 (OH) 3 (A) and disilanol isobutyl 8 2 was similarly isolated as a yellow colored powder (Yield = 0.19 g, 72%).…”

Section: Introductionmentioning

confidence: 68%

Catalytic ethylene polymerization by the titanium-polyhedral oligomeric silsesquioxane-Et3Al2Cl3 system

Mehta

Tembe

Parikh

et al. 2011

Reac Kinet Mech Cat

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Titanium (IV) precursors anchored to alkyl substituted polyhedral oligomeric silsesquioxane (POSS) trisilanol and disilanol were prepared and characterized. These catalysts, formulated as, were found to be active in the polymerization of ethylene at high temperatures in combination with ethylaluminum sesquichloride (Et 3 Al 2 Cl 3 ) as a co-catalyst. The polyethylene products so obtained are linear, crystalline and display narrow dispersities. The effect of various reaction parameters on the catalyst performance is described.

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Synthesis of low molecular weight polyethylene waxes by a titanium BINOLate–ethylaluminum sesquichloride catalyst system

Cited by 23 publications

References 59 publications

Synthesis of ultra‐low‐molecular‐weight polyethylene wax using a bulky Ti(IV) aryloxide–alkyl aluminum catalytic system

Synthesis of ultra‐low‐molecular‐weight polyethylene wax using a bulky Ti(IV) aryloxide–alkyl aluminum catalytic system

Polyethylene Waxes: Catalytic Synthesis by Ti‐Biphenolates

Catalytic ethylene polymerization by the titanium-polyhedral oligomeric silsesquioxane-Et3Al2Cl3 system

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