Methods and devices for continuous production of polymeric...

B - Operations – Transporting – 29 – B

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B29B 7/48 (2006.01) C08F 16/00 (2006.01) C08G 18/00 (2006.01) C08J 3/05 (2006.01) C09D 5/02 (2006.01)

Patent

CA 2629611

The present invention is directed to the use of continuous extrusion devices to form high quality polymer dispersions. Screw extruder devices of the present invention inject water into a zone of high pressure, temperature, and shear to cause the rapid inversion of a weld in less than, for example, one minute, which compares very favorably with conventional batch methods, which can take, for example, two or more hours to complete an inversion. This rapid inversion - a surprising result given the extended time inversion requires in batch processes - allows for the continuous production of polymer dispersions.

La présente invention concerne l'utilisation de dispositifs d'extrusion en continu pour la formation de dispersions polymériques de haute qualité. Des dispositifs d'extrusion à vis de la présente invention injectent de l'eau dans une zone à pression, température et cisaillement élevés, pour provoquer l'inversion rapide d'une ligne de soudure en moins d'une minute, par exemple, ce qui constitue un avantage indéniable par rapport aux procédés traditionnels par lots qui peuvent prendre, par exemple, deux heures, voire plus, pour une inversion. Cette inversion rapide, un résultat surprenant étant donné le temps relativement long nécessaire à une inversion dans des processus par lots, permet de produire en continu des dispersions polymériques.

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