Appeal No. 2000-0320 Page 7
Application No. 08/480,082
mixtures of a film forming, water soluble polymer and an ionic
polysaccharide,
optionally containing a latent counter-ion to gel the
polysaccharide upon release of the counter-ion.
Alternatively, the compositions of the invention can comprise
a
two part aqueous system, one of which contains the ionic
polysaccharide and film forming polymer and the other part
containing an aqueous solution of a counter-ion.
Viegas teaches (column 6, lines 24-39) that a complete
listing of useful water soluble, film forming polymers is not
possible. Representative useful polymers are the water
soluble alkyl celluloses, i.e., methyl and ethyl cellulose;
the hydroxyalkyl celluloses, i.e., hydroxypropylmethyl
cellulose and hydroxyethyl cellulose; hyaluronic acid and
water soluble salts thereof, i.e., sodium hyaluronate;
chondroitin sulfate and water soluble salts thereof, i.e.,
sodium chondroitin sulfate; polymers of acrylamide, acrylic
acid, and polycyanoacrylates; polymers of methyl methacrylate
and 2-hydroxyethyl methacrylate; polydextrose, cyclodextrin;
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