A method of preparing supported catalysts useful for olefin polymerization is described. The catalysts comprise a Group 4 metal complex that incorporates a tridentate dianionic ligand. An activator mixture is first made from a boron compound having Lewis acidity and an excess of an alumoxane. The activator mixture is then combined with a support and the Group 4 metal complex to give a supported catalyst. The method provides an active, supported catalyst capable of making high-molecular-weight polyolefins.
Catalysts based on 2-(2-aryloxy)quinoline or 2-(2-aryloxy)dihydroquinoline ligands
申请人:Equistar Chemicals, LP
公开号:US08158733B2
公开(公告)日:2012-04-17
Catalysts useful for polymerizing olefins are disclosed. The catalysts comprise an activator and a Group 4 metal complex that incorporates a dianionic, tridentate 2-(2-aryloxy)quinoline or 2-(2-aryloxy)dihydroquinoline ligand. In one aspect, supported catalysts are prepared by first combining a boron compound having Lewis acidity with excess alumoxane to produce an activator mixture, followed by combining the activator mixture with a support and the tridentate, dianionic Group 4 metal complex. The catalysts are easy to synthesize, support, and activate, and they enable facile production of high-molecular-weight polyolefins.
2-Phosphanylphenolate Nickel Catalysts for the Polymerization of Ethylene
作者:Joachim Heinicke、Martin Köhler、Normen Peulecke、Mengzhen He、Markus K. Kindermann、Wilhelm Keim、Gerhard Fink
DOI:10.1002/chem.200304888
日期:2003.12.15
synthesized and found to catalyze the polymerization of ethylene. To explore the potential for ligand-tuning, a variety of P-alkyl- and P-phenyl-2-phosphanylphenols was synthesized and allowed to react with [Ni(cod)(2)] (cod=1,5-cyclooctadiene) or with NiBr(2).DME and NaH. The complexes formed in situ with [Ni(cod)(2)] are generally active as ethylenepolymerizationcatalysts with all the ligands tested, whereas
合成了以前未知的甲基烯丙基镍2-二有机膦基苯酚酸酯(R = Ph,cHex),发现该催化剂催化乙烯的聚合。为了探索配体调节的潜力,合成了多种对位烷基和对位苯基-2-膦基苯酚,并使其与[Ni(cod)(2)](cod = 1,5-cyclooctadiene)或用NiBr(2).DME和NaH 与[Ni(cod)(2)]原位形成的配合物通常具有乙烯测试的所有配体作为乙烯聚合催化剂的活性,而当使用2-二烷基膦烷基苯酚时,后者的体系则没有活性。M(w)值从大约1000到大约100000 g mol(-1),对于各个R(2)P基团,按R = Ph的顺序增加
Methyl(2-phosphanylphenolato[P,O])nickel(II) Complexes – Synthesis, Structure, and Activity as Ethene Oligomerization Catalysts
to the pentacoordinate methyl(2-phosphanylphenolato)bis(trimethylphosphane)nickel(II) complex 4a. Higher yields of 4a and 4d were obtained by reactions of 1a and 1d with Me2Ni(PMe3)3. Single-crystal X-ray diffraction analyses of 3e and 4a have revealed the structures as square-planar trans-bis- and trigonal-bipyramidal mono(2-phosphanylphenolato)nickel(II) P1O-chelate complexes, respectively. The methylnickel
A method of preparing supported catalysts useful for olefin polymerization is described. The catalysts comprise a Group 4 metal complex that incorporates a tridentate dianionic ligand. An activator mixture is first made from a boron compound having Lewis acidity and an excess of an alumoxane. The activator mixture is then combined with a support and the Group 4 metal complex to give a supported catalyst. The method provides an active, supported catalyst capable of making high-molecular-weight polyolefins.