Continuous method for producing elastomers

C - Chemistry – Metallurgy – 08 – F

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C08F 36/04 (2006.01) C08F 2/06 (2006.01)

Patent

CA 2437291

The present invention relates to a continuous process for producing elastomers based on conjugate dienes or based on conjugate dienes and vinyl aromatic compounds or based on alkenes, polymerisation being carried out while maintaining certain residence times of the monomers used and the elastomers obtained in the reactors while maintaining a certain temperature gradient in the first reactor. The elastomers obtained by the process according to the invention are characterised in particular by a low metal ion content, a low ash content and a high cis-1,4 compound content in the polymer. Furthermore, the process according to the invention is particularly economical.

La présente invention concerne un procédé de production d'élastomères en continu à partir de diènes conjugués ou à partir de diènes conjugués et de composés vinylaromatiques ou à partir d'alcènes, la polymérisation s'effectuant en respectant des temps de séjour donnés des monomères utilisés et des élastomères obtenus dans les réacteurs, tout en respectant des gradients de température donnés dans le premier réacteur. Les élastomères obtenus grâce au procédé de l'invention se caractérise en particulier par une teneur limitée en ions métalliques, une teneur limitée en cendres, et une teneur élevée en liaisons cis-1,4 dans le polymère. De plus, le procédé de l'invention s'avère particulièrement économique.

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