| abstract |
Forming an aqueous monomer bead of an aqueous solution comprising a water-soluble ethylenically unsaturated monomer or monomer blend, polymerizing the monomer or monomer blend during suspension in a non-aqueous liquid to form a polymer bead, recovering the polymer bead, A method for reversed-phase suspension polymerization for the preparation of polymer beads comprising cleaning an aqueous liquid comprising providing a non-aqueous liquid in a vessel (1), suspending a monomeric bead from an aqueous monomer or monomer blend in a non- To form a polymerized bead, removing a suspension of the polymer beads in the non-aqueous liquid from the vessel, and recovering a water-soluble or water-swellable polymeric bead from the suspension, wherein the non- Impurities, followed by suspension of the non-aqueous liquid Wherein the cleaning step provides a cleaned non-aqueous liquid suitable for use in a reversed-phase suspension polymerization process, wherein the cleaning step removes particles from the non-aqueous liquid in at least one filtration step . The invention also relates to a device suitable for carrying out the reversed-phase suspension polymerization and a polymeric bead obtainable by means of said process or by means of said device. The invention further relates to a cleaned non-aqueous liquid which can be obtained by said process. |