Patent ID: 8741977

Claim:
A foam composition comprising a cyclodextrin crosslinked with a polyurethane prepolymer and having a foam structure, the cyclodextrin crosslinked by a polyurethane prepolymer comprising a reaction product of a reactive isocyanate moiety reacted with at least one isocyanate-reactive group on at least a portion of the cyclodextrin, wherein the isocyanate-reactive group is an active hydrogen on a modifying group attached to the at least a portion of the cyclodextrin; wherein the content of the cyclodextrin in the composition is from 0.5 wt % to 50 wt %; wherein the foam has an original volume and upon absorption of water is capable of swelling to a volume at least about 20% greater than its original volume; and wherein the content of the water in the composition is in the range from 10 wt. % to 80 wt. %, based on the composition, prior to the crosslinking, foaming and drying steps.