A continuous process of extruding and mechanically...

C - Chemistry – Metallurgy – 08 – J

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C08J 3/03 (2006.01) B29C 47/00 (2006.01) C09D 5/44 (2006.01)

Patent

CA 2373551

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 que l'on peut préparer en fusionnant dans un viscodoseur mécanique un écoulement d'une phase dispersée liquide ou fondue avec un écoulement d'une phase continue liquide ou fondue de façon à obtenir une dispersion ou une émulsion. Cet écoulement de phase dispersée liquide ou fondue contient un polymère qui est de préférence solide à température ambiante, mais fondu à une certaine élévation de température. Ce polymère est formé à l'état fondu ou formé et fondu par un processus de réaction continu tel qu'un processus d'extrusion, comprenant l'extrusion de matière fondue et l'extrusion de composé. On a découvert que l'on peut préparer une dispersion faiblement polydispersée dont le calibre est inférieur au micron par le procédé de cette invention.

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