Graft polymerization process

Details Graft polymerization process Graft polymerization process

C - Chemistry, Metallurgy

08

F

C08F 291/00 (2006.01) C08F 2/24 (2006.01) C08F 290/04 (2006.01)

Patent

CA 2072301

A process for the emulsion polymerization of graft copolymers comprising the steps of: a) obtaining an unsaturated polymer containing terminal or pendant polymerizable functionalities; b) dissolving the resultant unsaturated polymer in an ethylenically unsaturated monomer and admixing the resultant mixture in water in the presence of a surfactant to form an aqueous pre-emulsion; c) microfluidizing the aqueous phase of (b) to obtain an emulsion containing polymer phase droplets averaging less than 0.5 µm; and d) subsequently graft polymerizing the monomer with the unsaturated polymer in the microfluidized aqueous phase using free radical polymerization techniques.

Une méthode pour la polymérisation en émulsion de copolymères de greffe comprend les étapes suivantes : a) obtenir un polymère insaturé renfermant des fonctions polymérisables, terminales ou ramifiées; b) dissoudre le polymère insaturé résultant, en présence d'un surfactif, pour former une pré-émulsion aqueuse; c) microfluidiser la phase aqueuse de « b » pour obtenir une émulsion renfermant des gouttelettes d'une taille moyenne inférieure à 0,5 micron; d) polymériser ensuite par greffe le monomère avec le polymère insaturé dans la phase aqueuse microfluidisée, en utilisant des techniques de polymérisation par radicaux libres.

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