Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2009-05-07
2011-10-18
Lu, Caixia (Department: 1765)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S339000, C526S943000
Reexamination Certificate
active
08039565
ABSTRACT:
A catalytic system usable for the copolymerization of at least one conjugated diene and at least one monoolefin, a process for preparing this catalytic system, a process for preparing a copolymer of a conjugated diene and at least one monoolefin using said catalytic system, and said copolymer are described. This catalytic system includes:(i) an organometallic complex represented by the following formula:in-line-formulae description="In-line Formulae" end="lead"?{[P(Cp)(Fl)Ln(X)(LX)}p (1)in-line-formulae description="In-line Formulae" end="tail"?where Ln represents a lanthanide atom to which is attached a ligand molecule comprising cyclopentadienyl Cp and fluorenyl Fl groups linked to one another by a bridge P of the formula MR1R2, M is an element from column IVa of Mendeleev's periodic table and R1and R2each represent alkyl groups of 1 to 20 carbon atoms or cycloalkyl or phenyl groups of 6 to 20 carbon atoms, X represents a halogen atom, L represents an optional complexing molecule, such as an ether, and optionally a substantially less complexing molecule, such as toluene, p is a natural integer greater than or equal to 1 and x is greater than or equal to 0, and(ii) a co-catalyst selected from alkylmagnesiums, alkyllithiums, alkylaluminums, Grignard reagents and mixtures of these constituents.
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Boisson Christophe
Monteil Vincent
Spitz Roger
Buchanan & Ingersoll & Rooney PC
Lu Caixia
Michelin & Recherche et Technique S.A.
Total Petrochemicals Research-Feluy
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