A continuous process of extruding and mechanically...

B - Operations – Transporting – 01 – F

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B01F 17/42 (2006.01)

Patent

CA 2645399

Stable aqueous dispersions or emulsions can be prepared by merging into a mechanical dispenser a stream of a molten or liquid disperse phase with a stream of a molten or liquid continuous phase to form a dispersion or emulsion. The molten or liquid disperse phase stream contains a polymer that is preferably a solid at room temperature, but molten at some advanced temperature. The polymer is formed in a molten state or formed and melted by a continuous reaction process such as an extrusion process, including melt extrusion or compound extrusion. It has been discovered that low polydisperse submicron sized dispersion can be prepared by the method of the present invention.

La présente invention concerne des dispersions ou des émulsions aqueuses stables qu'il est possible de préparer en mélangeant dans un disperseur mécanique un flux de phase dispersée fondue ou liquide avec un flux de phase continue fondue ou liquide afin d'obtenir une dispersion ou une émulsion. Le flux de phase dispersée fondue ou liquide renferme un polymère qui est de préférence un solide à température ambiante, mais qui fond à une température élevée. Le polymère est formé à l'état fondu ou formé et fondu par un processus réactionnel continu tel qu'un procédé d'extrusion, y compris l'extrusion fondue et l'extrusion composée. On a découvert qu'une dispersion faiblement polydispersée de particules submicroniques peut être préparée grâce à la méthode proposée suivant la présente invention.

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