Method for the production of polymer foams based on reactive...

C - Chemistry – Metallurgy – 08 – J

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C08J 9/28 (2006.01)

Patent

CA 2558457

Disclosed is a method for producing polymer foams from reactive polycondensation resins with a maximum pore diameter of 1 ~m. Said method comprises the steps of: 1) producing a gelable mixture of the reactive polycondensation resin in a solvent or dispersing agent; 2) producing an aqueous dispersion containing polymer particles; 3) mixing the mixture obtained in step 1) with the dispersion obtained in step 2), whereby a hydrated gel is obtained; and 4) drying the hydrated gel so as to obtain the polymer foam. The drying process in step 4) takes place at a pressure and a temperature that lie below the critical pressure and below the critical temperature of the liquid phase of the gel while the gel is not brought in contact with an organic liquid in order to replace the water contained in the gel by said liquid following step 3) and prior to step 4).

Procédé de fabrication de mousses de polymère à base de résines réactives de polycondensation d'un diamètre de pore maximum de 1 µm, procédé comprenant les étapes suivantes : 1) préparation d'un mélange gélifiable de résine réactive de polycondensation dans un solvant ou un dispersant, 2) préparation d'une dispersion aqueuse renfermant des particules de polymère, 3) mélange du produit obtenu à l'étape 1) avec la dispersion de l'étape 2), ce qui conduit à la formation d'un gel renfermant de l'eau, et 4) séchage du gel renfermant de l'eau, ce qui conduit à la formation d'une mousse de polymère. Le séchage effectué à l'étape 4) s'effectue à une pression et à une température inférieures, respectivement, à la pression critique et à la température critique de la phase liquide du gel. Le gel obtenu après l'étape 3) et avant l'étape 4) n'est pas amené en contact avec un liquide organique, afin que l'eau contenue dans le gel soit échangée contre ce liquide.

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