A process for the preparation of high impact vinylaromatic...

C - Chemistry – Metallurgy – 08 – F

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C08F 279/02 (2006.01) C08F 255/02 (2006.01) C08F 255/04 (2006.01) C08F 255/06 (2006.01)

Patent

CA 2588577

A process for the preparation of vinylaromatic (co)polymers grafted on an elastomer comprising a rigid matrix consisting of vinylaromatic polymers or copolymers and of an elastomeric phase dispersed in the matrix in form of particles with a strictly bimodal distribution which comprises the functionalization of a first elastomeric fraction by means of a catalytic system containing a stable free radical initiator and subsequently the polymerization of the thus obtained mixture also in presence of a second non functionalized elastomeric fraction.

L'invention concerne un processus de préparation de (co)polymères vinylaromatiques greffés sur un élastomère comprenant une matrice rigide composée de polymères ou de copolymères vinylaromatiques et d'une phase élastomère dispersée dans la matrice sous forme de particules avec une distribution strictement bimodale qui englobe, d'une part, la fonctionnalisation d'une première fraction élastomère au moyen d'un système catalytique possédant un initiateur de radical libre stable et, d'autre part, la polymérisation du mélange ainsi obtenu également en présence d'une seconde fraction élastomère non fonctionnalisée.

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