Dispersions of resins and a method of making the same

C - Chemistry – Metallurgy – 08 – J

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C08J 3/03 (2006.01) C08J 3/205 (2006.01) C09D 5/02 (2006.01)

Patent

CA 2429448

Stable dispersions of solid, semi-solid, and liquid resins can be prepared by merging into a mechanical disperser 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. A polymer that is preferably a solid at room temperature, but molten at some advanced temperature may be dispersed with low molecular weight polymers, or intermediate moleculer weight polymers continuously in an extruder. A low polydispersity powder-slurry curable coating composition having volume average particle sizes of less than 10 µm may be be prepared by the method of the present invention. Pigmentation of a powder-slurry coating composition is conveniently accomplished by adding pigment to the melted polymer, or to the continuous phase, or to the dispersion after the continuous phase is merged with the disperse phase.

La présente invention concerne des dispersions stables de résines solides, semi-solides et liquides 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. Un polymère qui est de préférence un solide à température ambiante, mais qui fond à une température élevée, peut être dispersé avec des polymères à faible poids moléculaire, ou des polymères à poids moléculaire moyen de manière continue dans une extrudeuse. Le procédé selon l'invention permet d'obtenir une composition de revêtement durcissable de suspension pulvérulente à faible polydispersité possédant des dimensions granulométriques volumiques moyennes inférieures à 10 µm. La pigmentation d'une composition de revêtement de suspension pulvérulente est accomplie de manière appropriée en ajoutant un pigment au polymère fondu, ou à la phase continue, ou à la dispersion après que la phase continue est mélangée avec la phase dispersée.

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