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AssigneeMichelin Recherche et Technique S.A.
InventorsJean-Michel Favrot, Philippe Laubry
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The present invention provides a process for preparing amino functionalized diene polymers with 1,4-trans linkage content equal to or greater than 70%. The invention also concerns polymers of such type, a rubber composition and a tire casing containing those polymers. The process of preparation according to the invention comprises polymerizing at least one diene monomer by means of a lithium catalytic system, which comprises at least one hydrocarbon solvent, one compound A of a IIIA group metal, one compound B of an alkaline earth metal and one aminolithium initiator C. Amino functionalized diene polymers with high 1,4-trans linkage content according to the invention are such that the amino function, situated at the end of the polymer chain, is a tertiary amino function, the rate of functionalization of said polymers being equal to or greater than 50% and the 1,4-trans linkage content being equal to or greater than 70%. A rubber composition vulcanizable with sulfur according to the invention is such that it contains at least said polymer. A tire casing according to the invention is such that it contains said composition.
A process for preparing amino-functionalized diene polymers with a 1,4-trans linkage content equal to or greater than 70% and with a rate of functionalization equal to or greater than 50% comprising polymerizing at least one diene monomer by means of a lithium catalytic system, wherein said catalytic system consists essentially of at least one hydrocarbon solvent, one compound A of IIIA group metal, one compound B of an alkaline earth metal and one aminolithium initiator C.
Dependencies are inferred from the claim text.