Absorbent phycocolloids and a method for their manufacture

C - Chemistry – Metallurgy – 08 – B

Patent

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C08B 37/00 (2006.01) A61L 15/28 (2006.01) A61L 15/40 (2006.01) B01J 13/02 (2006.01) C08L 5/04 (2006.01) C08L 5/12 (2006.01)

Patent

CA 2090794

ABSTRACT OF THE DISCLOSURE Described is a method for preparing a water-swellable, substantially water-insoluble material. The method involves forming a first solution containing a water-soluble phycocolloid. The first solution is then added to a second solution containing an ion capable of rendering the water-soluble phycocolloid substantially water insoluble. The phycocolloid material is then removed from the second solution and subjected to a solvent exchange to remove water present in the phycocolloid material. Hollow particles can be formed by including a gelation-retarding agent in the first solution. Also described is a water-swellable, substantially water-insoluble particle defining an interior void. The particle comprises an outer shell formed from a water-insoluble phycocolloid. The outer shell defines an interior void which contains a phycocolloid. - 25 -

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