| 摘要 |
Transportation of Polymeric Bead Products A method of transportation of a polymer product from a first location to a second location in which the transportation comprises at least one of the group consisting of: (a) conveyance in a vehicle for at least 50 km; and/or (b) conveyance in at least one conduit in which the polymer product comprises water soluble or water swellable polymer beads, wherein the water soluble or water swellable polymer beads are obtainable by a process comprising a reverse-phase suspension polymerisation comprising forming aqueous monomer beads of an aqueous solution comprising water-soluble ethylenically unsaturated monomer or monomer blend and polymerising the monomer or monomer blend, to form polymer beads while suspended in a non-aqueous liquid, and recovering polymer beads, in which the process comprises providing in a vessel (1) a volume (2) of non-aqueous liquid wherein the volume of non-aqueous liquid extends between at least one polymer bead discharge point (3) and at least one monomer feed point (4), feeding the aqueous monomer or monomer blend through orifices (5) into, or onto, the non- aqueous liquid to form aqueous monomer beads, allowing the aqueous monomer beads to flow towards the polymer bead discharge point initiating polymerisation of the aqueous monomer beads to form polymerising beads, wherein the polymerising beads have formed polymer beads when they reach the polymer bead discharge point, removing a suspension of the polymer beads in non-aqueous liquid from the vessel at the polymer bead discharge point and recovering, water soluble or water swellable polymer beads from the suspension, in which the aqueous monomer or monomer blend and/or the orifices is/are vibrated such that the frequency multiplied by the weight average droplet diameter is between 150 and 800 mm/s. The method enables polymer product transported to a second location to have a narrow particle size distribution and reduced fines or dust content. |
