Magnetic polymer pellets and a method of generating the...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 3/20 (2006.01) B29B 9/12 (2006.01) C08J 3/075 (2006.01) C09K 8/90 (2006.01) C09K 8/92 (2006.01) A61K 9/16 (2006.01)

Patent

CA 2710986

The invention is related to magnetic polymer pellets represented as polymer matrix and solid filler as well as to their application for gel plugs' formation. As per the invention the polymer pellet is represented as gel matrix from anionic polymer cross-linked with cations of multivalent metals in which ferromagnetic micro-particles are dispersed with the ratio of the ferromagnetic micro- particles and anionic polymer concentrations from 0.5 to 5. The locking gel plug formation method provides the delivery of polymer pellets to the gel plug formation zone and the locking gel plug is formed due to the ambient medium pH increase to pH > 7 in the confined volume where they are retained by the external magnetic field.

L'invention concerne des granules polymères magnétiques se présentant sous la forme d'une matrice polymère et d'une charge solide, ainsi qu'un procédé de formation de bouchons de gel. Le granule polymère de l'invention se présente sous la forme d'une matrice de gel constituée d'un polymère anionique réticulé par des cations de métaux multivalents et dans laquelle sont dispersées des microparticules ferromagnétiques dans une concentration pondérale de celles-ci et et du polymère anionique comprise entre 0,5 et 5. Le procédé de formation d'un bouchon de gel obturant consiste à amener les granules polymères dans la zone de formation du bouchon de gel et former le bouchon de gel obturant par gonflement intensif des granules, ce qui accroît le pH d'un milieu environnant à une valeur de pH > 7 dans un volume confiné, dans lequel ils sont retenus par un champ magnétique externe.

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