Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2005-08-09
2005-08-09
Wu, David W. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S172000, C526S126000, C526S352000, C526S348600, C526S169000, C556S014000, C556S020000, C556S021000, C556S022000, C556S023000, C556S052000, C502S103000, C502S208000, C502S210000, C502S213000, C568S012000
Reexamination Certificate
active
06927262
ABSTRACT:
The invention relates to novel bridged biphosphole ligands according to the general formula:where R2, R3, R4are chosen from hydrogen, alkyl, aryl or silyl, R1is chosen from hydrogen, alkyl, aryl or halogen, R1possibly being replaced with a direct bond between the two phosphorus atoms and T is a divalent group. The invention also relates to metallocenes obtained from these ligands. These metallocenes are useful as catalytic components for the polymerization of olefins.
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Buzin Francois-Xavier
Deschamps Bernard
Deschamps Eliane
Malinge Jean
Mathey Francois
Atofina
Lee Rip A.
Smith, Gambrell and Russell, LLP
Wu David W.
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