Method for producing hydrocolloid foams

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 9/28 (2006.01) F26B 3/347 (2006.01) F26B 5/04 (2006.01) F26B 5/06 (2006.01) F26B 7/00 (2006.01)

Patent

CA 2571232

A method for producing foams, such as sponges, from hydrocolloids is described. A solid or semi-solid gel is formed by dissolving polymeric material in an aqueous solvent. The gel formed is allowed to set, and may optionally then be cut into the desired shape. The gel may be frozen to allow formation of ice crystals to act as porogens. Subsequently, the gel is exposed to a radiant energy field for drying under vacuum. This causes the solvent to boil and the foam or sponge is formed. Medicinally active ingredients may be included in the process, so that the sponge or foam formed contains the active ingredient dispersed within the structure. The method described provides an alternative to the conventional methods of particulate leaching or freeze drying.

L'invention concerne un procédé permettant de produire des mousses, telles que des éponges, à partir d'hydrocolloïdes. Un gel solide ou semi-solide est formé par la dissolution d'un matériau polymère dans un solvant aqueux. Une fois durci, le gel ainsi formé peut éventuellement être découpé pour prendre une forme voulue. Ce gel peut être congelé afin d'entraîner la formation de cristaux de glace destinés à agir comme porogènes. Par la suite, ce gel est exposé à un champ d'énergie rayonnante afin d'être séché sous vide, ce qui a pour effet de faire bouillir le solvant et de former la mousse ou l'éponge. Des ingrédients actifs sur le plan médicinal peuvent être inclus dans le processus, de façon que l'éponge ou la mousse contiennent l'ingrédient actif dispersé dans la structure. Le procédé décrit constitue une solution de rechange aux procédés classiques de lixiviation de particules ou de lyophilisation.

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