Syndiotactic vinylaromatic polymerization using multiple...

C - Chemistry – Metallurgy – 08 – F

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C08F 12/04 (2006.01)

Patent

CA 2291699

A method for making a syndiotactic vinylaromatic polymer. The method includes mixing a first amount of a vinylaromatic monomer with a catalyst in a first back-mixed reaction zone under polymerization conditions such that the vinylaromatic monomer polymerizes to a conversion of from 60 to 85 percent to form a polymer-containing mixture. The polymer-containing mixture is passed to at least one other back-mixed reaction zone where it contacts a second amount of the vinylaromatic monomer under polymerization conditions such that the syndiotatic vinylaromatic polymer is formed.

L'invention porte sur le procédé de fabrication d'un polymère vinylaromatique syndiotactique consistant à mélanger une première quantité de monomère vinylaromatique avec un catalyseur dans une zone réactive de mélange à contre-courant dans des conditions de polymérisation, de manière à ce que ledit monomère polymérise avec un rapport de conversion de 60 à 85 % en donnant un mélange contenant le polymère. Ledit mélange est passe ensuite dans au moins une autre zone réactive de mélange à contre-courant où il entre en contact avec une deuxième quantité de monomère vinylaromatique dans des conditions de polymérisation conduisant à la formation du polymère vinylaromatique syndiotactique.

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