Initiating system and process for the anionic (co)...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 4/58 (2006.01) C08F 4/48 (2006.01) C08F 12/00 (2006.01) C08F 20/12 (2006.01) C08F 36/00 (2006.01) C08F 297/02 (2006.01)

Patent

CA 2232532

The invention relates to an initiating system for anionic (co)polymerization of (meth)acrylic, vinylaromatic and/or diene monomers , and a process for preparing this system. The initiating system comprises the reaction product of at least one cyclic siloxane and at least one organometallic compound of sufficient reactivity to open the siloxane cycle. It can be used to prepare homopolymers of (meth)acrylic, vinylaromatic or diene monomers , statistical or sequenced copolymers of these monomers, particularly poly(methyl methacrylate) with a high concentration of isotactic triads.

L'invention concerne un système d'amorçage pour la (co)polymérisation anionique de monomères (méth) acryliques, vinylaromatiques et/ou diéniques, ainsi qu'un procédé pour la préparation de ce système. Le système d'amorçage comprend le produit de réaction d'au moins un siloxane cyclique et d'au moins un composé organométallique de réactivité suffisante pour ouvrir le cycle siloxane. Il est utilisable pour la préparation d'homopolymères de monomères (méth)acryliques, vinylaromatiques ou diéniques, de copolymères statistiques ou séquencés de ces monomères et, en particulier, à du poly(méthacrylate de méthyle) à teneur élevée en triades isotactiques.

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