Patent ID: 6740409
Filing Date: 2004-05-25
Classification: B32B,Y10T

Abstract:
A film, comprising:a first layer, comprising a first polymer comprising a plurality of hydrogen bond donating moleties selected from the group consisting of Oâ€”H, Nâ€”H, Pâ€”H and Sâ€”H; and a second layer, comprising a second polymer comprising a plurality of hydrogen bond accepting moieties selected from the groups consisting of C&boxH;O, Oâ€”H, Nâ€”H, Câ€”F, P&boxH;O and Câ‰¡N; wherein the first and second polymers are each soluble in water; the film does not contain a polymer layer comprising a plurality of permanently electrostatically charged groups when the film is stable; and said first polymer or said second polymer comprises carboxylic acid groups.