Dramatic Enhancement of Activities for Living Ziegler−Natta Polymerizations Mediated by “Exposed” Zirconium Acetamidinate Initiators:  The Isospecific Living Polymerization of Vinylcyclohexane

Efficient copolymerization of ethylene with norbornene or its derivatives using half-metallocene zirconium(iv) catalysts

“…7,8 5-Ethylidene-2-norbornene (ENB) and 5-vinyl-2-norbornene (VNB) satisfactorily meet these requirements. [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] The half-metallocene scandium complexes reported by Hou and his colleagues showed excellent catalytic activity for ethylene/norbornene (NBE) and ethylene/dicyclopentadiene (DCPD) copolymerization, with comonomer incorporation of 44 and 45 mol%, respectively. 20 For example, when Ph 2 -C(Flu)(Cp)ZrCl 2 (Cp ¼ C 5 H 5 , Flu ¼ uorenyl) was used in ethylene/VNB copolymerization, the catalytic activity could be up to 3520 kg per mol Zr per h with VNB incorporation of 32 mol%.…”

Synthesis, crystal structure and ethylene polymerization activity of zirconium complexes bearing mono-Cp and tridentate Schiff base [ONO] ligands

“…There are many reports concerning this topic especially using metallocene and non-Cp (cyclopentadienyl) catalysts [3][4][5]. Among them, mixed ligands titanium complexes of the type Cp 0 Ti(L)X 2 containing cyclopentadienyl ligand and non-Cp ligand have attracted considerable attention, because this type of catalyst has been expected to exhibit unique characteristics as olefin polymerization catalyst that would combine the merits of metallocene and non-Cp catalyst type [6][7][8][9][10][11][12]. However, there have been only a few reports on the use of mixed ligands zirconium complexes for the olefin polymerization [13,14].…”

Katalysatoren für die lebende Insertionspolymerisation von Alkenen: mit Ziegler-Natta-Chemie zu neuartigen Polyolefin-Architekturen

“…Die Katalysatoraktivit‰t und das resultierende Molekulargewicht waren hˆher, und das Polymer war hoch isotaktischSchema 21. In d¸nnen Filmen des Polymers tritt in einer Polyhexen-Matrix eine Phasentrennung zu PMCP-S‰ulen ein.Sita et al beschrieben modifizierte Amidinat-Katalysatoren 39 a ± c f¸r die lebende Olefinpolymerisation (Abbildung 7) [113]. ([mmmm] > 0.95).…”