Process for producing an epoxidized polymer

Details Process for producing an epoxidized polymer Process for producing an epoxidized polymer

C - Chemistry, Metallurgy

08

F

C08F 8/08 (2006.01) C08C 19/06 (2006.01)

Patent

CA 2365833

According to the present invention, provided is an industrially advantageous process for producing an epoxidized polymer, with safety and efficiency, wherein the epoxidation of a polymer having an olefinic carbon-carbon double bond is effected under the presence of substantially no alkali metal ion by adding an aqueous solution containing (i) ammonium tungstate and/or tungstophosphoric acid and (ii) phosphoric acid, in which the amount of (ii) phosphoric acid is not less than 0.25 moles relative to 1 gram atom of tungsten atom contained in the (i) ammonium tungstate and/or tungstophosphoric acid, and an aqueous hydrogen peroxide, separately to a solution of said polymer and a quaternary ammonium salt in an organic solvent immiscible with water.

Selon la présente invention, il s'agit d'une méthode industriellement avantageuse pour produire un polymère époxydé, avec sécurité et efficacité, méthode dans laquelle l'époxydation d'un polymère ayant une double liaison carbone-carbone oléfinique est effectuée en présence de sensiblement aucun ion de métal alcalin en ajoutant une solution aqueuse contenant (i) du tungstate d'ammonium et/ou de l'acide tungstophosphorique et (ii) de l'acide phosphorique, la quantité de (ii) l'acide phosphorique n'étant pas inférieure à 0,25 mole par rapport à 1 atome-gramme d'un atome de tungstène contenu dans le (i) tungstate d'ammonium acide et/ou l'acide tungstophosphorique et un peroxyde d'hydrogène aqueux, séparément à une solution dudit polymère et d'un sel d'ammonium quaternaire dans un solvant organique non miscible à l'eau.

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