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Metallocene Catalysts for Olefin Oligomerization
Macromolecular Symposia, 2006AbstractMetallocene complexes with a cocatalyst such as methylalumoxane, MAO can be used as catalysts in the dimerization or oligomerization of olefins (alkenes) including the (co‐/hydro‐)oligomerization of ethene, of the α‐olefins propene, 1‐butene, 1‐pentene, 1‐hexene, and higher α‐olefins, branched α‐olefins, cyclic olefins and α,ω‐dienes.
Janiak, Christoph, Blank, Jan-Frederik
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Metallocene catalysts technology and environment
Comptes Rendus de l'Académie des Sciences - Series IIC - Chemistry, 2000Abstract The polyolefin industry is increasingly confronted with the challenge to meet restricting environmental regulations. In parallel, the environmentally conscious public opinion (customer!), now globally organized, demands even more stringent anticipative actions to prevent any short or long term damages inflicted upon environment.
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Polymerization of propene by post‐metallocene catalysts
Macromolecular Symposia, 2004AbstractIn the last few years several non‐metallocene catalysts have been disclosed as efficient catalysts for the stereospecific polymerization of propene.In this paper we summarize some recent literature data and some new results concerning the stereochemical mechanism of propene polymerization promoted by late transition metal systems and group 4 ...
LAMBERTI, Marina +4 more
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Hard versus Soft Materials as Supports for Metallocene and Post‐Metallocene Catalysts
Macromolecular Reaction Engineering, 2009AbstractThe influence of organic supports on the polymerization behavior of post‐metallocene catalysts is studied and compared with similarly supported titanium and zirconium metallocenes. The effects of the immobilization, activation, and polymerization process were studied by video microscopy, laser confocal fluorescence microscopy, SEM, and TEM.
Naundorf, C. +5 more
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Metallocene Catalysts in Dispersed Media
1997Metallocene catalysts are organometallic coordination compounds in which one or two cyclopentadienyl rings or substituted cyclopentadienyl rings are bonded to a central transition metal atom, as shown in Figure1. The nature and number of the rings and substituents (S), the type of transition metal (M) and its substituents (R), the type of the bridge ...
J. B. P. Soares, A. E. Hamielec
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New polyolefins by metallocene catalysts
Pure and Applied Chemistry, 1998Abstract
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Heterogenised MAO-free Metallocene Catalysts
1999The treatment of dehydroxylated silica with B(C6F5)3 in the presence of dimethylaniline results in borato-modified silica of the approximate composition [HNMe2Ph][(SiO2)50B(C6F5)3] which on addition of metallocene dimethyls in the presence or absence of AlMe3 give catalysts for the polymerisation of ethylene.
Simon J. Lancaster +2 more
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Olefin Polymerization with Metallocene Catalysts
2014This chapter firstly explains the basic terms and concepts concerning olefin polymerization and polymer synthesis, and then provides comprehensive yet concise commentaries on olefin polymerization by metallocene catalysts. In Sect. 1.1 (Introduction), the history of olefin polymerization catalysts is briefly reviewed with a focus on the uniformity of ...
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Recent development in heterogeneous metallocene catalysts
Macromolecular Symposia, 1995AbstractThe synthetic methods of heterogeneous metallocene catalysts reported so far in academic journals are summarized together with their catalyst performance. Some of our new results in this field are also described in brief.
Kazuo Soga +3 more
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New Isotactic Polypropylenes via Metallocene Catalysts
1995Chiral bridged bisindenyl zirconoeenes with special substitution patterns on the aromatic rings are potentially commercial catalysts for the production of isotactic polypropylenes. The performance characteristics of these systems are different, the variations being induced by size and position of the substituents.
W. Spaleck +8 more
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