Process for the preparation of sbr rubbers with an improved...

C - Chemistry – Metallurgy – 08 – F

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C08F 236/10 (2006.01) C08C 19/32 (2006.01) C08C 19/44 (2006.01) C08F 8/02 (2006.01)

Patent

CA 2405987

Process for the production of statistic elastomeric conjugated diene-vinyl arene copolymers having a branched structure which comprises: (1) anionic copolymerization in solution of the conjugated diene and vinyl arene monomers, in the presence of randomizing agents and an initiator selected from the group of Lithium alkyls, the copolymerization being carried out until the almost total disappearance of the monomers; (2) addition to the solution of step (1) of a quantity of Lithium alkyl from 1 to 4 times the molar quantity of the Lithium alkyl of step (1); (3) addition to the polymeric solution of step (2) of a compound having the general formula R-Br, the molar ratio between R-Br and the total Lithium alkyl ranging from 0.6/1 to 1/1, preferably from 0.7/1 to 0.9/1, thus obtaining an elastomeric branched copolymer.

L'invention concerne un procédé de production de copolymères statistiques élastomères conjugués diène/vinyle-arène présentant une structure ramifiée. Ledit procédé comprend les étapes suivantes: (1) copolymérisation anionique en solution des monomères conjugués diène et vinyle-arène, en présence d'agents de randomisation et d'un initiateur sélectionné dans le groupe des alkyles de lithium, cette copolymérisation se faisant jusqu'à ce que les monomères aient presque totalement disparu; (2) addition à la solution obtenue à l'étape (1) d'une quantité d'alkyle de lithium correspondant à 1-4 x la quantité molaire de l'alkyle de lithium utilisé à l'étape (1); (3) addition à la solution polymère obtenue à l'étape (2) d'un composé de formule générale R-Br, le rapport molaire entre R-Br et la quantité totale d'alkyle de lithium allant de 0,6/1 à 1/1, de préférence de 0,7/1 à 0,9/1, cela permettant d'obtenir un copolymère élastomère ramifié.

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