Organic compounds -- part of the class 532-570 series – Organic compounds – Heavy metal containing
Reexamination Certificate
2008-07-01
2008-07-01
Gonzale, Porfirio Nazario (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heavy metal containing
C556S012000, C502S103000, C502S117000, C526S160000, C526S943000
Reexamination Certificate
active
10529461
ABSTRACT:
The bridged metallocene compound or the olefin polymerization catalyst which comprises the compound, enables high polymerization activity in polymerizing one or more monomers selected from ethylene and α-olefins. The bridged metallocene compound contains specific substituted cyclopentadienyl and fluorenyl groups which are linked via carbon or silicon atoms. In the method for the preparation of polyolefins, one or more monomers, preferably ethylene as an essential monomer, selected from ethylene and α-olefins are copolymerized in the presence of the olefin polymerization catalyst comprising the bridged metallocene compound, so that an ethylene based polymer with an ethylene content of more than 50 mol % is obtained.
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Endo Koji
Kaneyoshi Hiromu
Kawai Koji
Tohi Yasushi
Urakawa Naomi
Gonzale Porfirio Nazario
Mitsui Chemicals Inc.
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