Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Reexamination Certificate
2004-08-24
2008-11-25
Lu, Caixia (Department: 1796)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
C502S103000, C502S104000, C502S132000, C526S124200
Reexamination Certificate
active
07456126
ABSTRACT:
The present invention relates to a Ziegler-Natta catalyst for olefin polymerization and a method for polymerization of olefin using the same. Specifically, the invention relates to a Zeigler-Natta catalyst for olefin polymerization, which is produced by a method comprising the step of reacting a transition metal compound in which the transition metal having an oxidation number of 4 or more is selected from Groups IV, V or VI of the Periodic table and two or more aryloxy ligands are bound to the transition metal, with an organomagnesium compound, to reduce said transition metal compound to a reduced form in which the transition metal has an oxidation number of 3, and a method for polymerization of olefin using said catalyst.
REFERENCES:
patent: 6677266 (2004-01-01), De Rege Thesauro
patent: 2007/0293710 (2007-12-01), Kim et al.
patent: 0606125 (1994-07-01), None
patent: 6340711 (1994-12-01), None
Arjan Van Der Linden, et al,, “Polymerization of a-Olefins and Butadiene and Catalytic Cyclotrimerization of 1-Alkynes by a New Class of Group IV Catalysts . . . ”, J. Am. Chem. Soc. of the USA, 1995, pp. 3008-3021, No. 117.
Friedrich G. Sernetz, et al., “Copolymerization of Ethene with Styrene Using Methylaluminoxane-Activated Bis (phenolate) Complexes”, Macromolecules, 1997, pp. 1562-1569.
Chang Ho-Sik
Kim Eun-il
Barlow Josephs & Holmes, Ltd.
Lu Caixia
Samsung Total Petrochemicals Co., Ltd.
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