Anionic preparation of a branched dienic elastomer

Details Anionic preparation of a branched dienic elastomer Anionic preparation of a branched dienic elastomer

C - Chemistry, Metallurgy

08

F

C08F 136/04 (2006.01) C08C 19/44 (2006.01) C08F 136/06 (2006.01) C08F 236/10 (2006.01)

Patent

CA 2345848

The present invention relates to an anionic preparation of a branched dienic elastomer. According to the invention, a process for preparing a branched dienic elastomer includes the step of anionically polymerizing at least one conjugate dienic monomer having 4 to 12 carbons in a polymerization medium comprising a hydrocarbon solvent and an organometallic initiator, and of adding to the said polymerization medium, during or at the end of the polymerization, a starring composed of one tris- (alkylphenyl)phosphite, such that the molar ratio of the starring agent to the initiator is between 0.1 and 1.5. According to the invention, this process is characterized in that it uses the tris-(2,4-di-tert-butylphenyl)phosphite as starring agent.

La présente invention concerne un procédé de préparation par voie anionique d'un élastomère diénique ramifié. Un procédé de préparation selon l'invention d'un élastomère diénique ramifié consiste dans un milieu de polymérisation comprenant un solvant hydrocarboné et un initiateur organométallique, en une polymérisation par voie anionique d'au moins un monomère diène conjugué ayant de 4 à 12 atomes de carbone, et en une adjonction audit milieu de polymérisation, pendant ou à l'issue de ladite polymérisation, d'un agent d'étoilage constitué d'un tris- (alkylphényl)phosphite de telle manière que le rapport du nombre de moles d'agent d'étoilage sur le nombre de moles d'initiateur soit compris entre 0,1 et 1,5. Selon l'invention, ce procédé est tel qu'il consiste à utiliser le tris-(2,4-di-tert-butylphényl)phosphite à titre d'agent d'étoilage.

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