Water soluble films of polyvinyl alcohol and polyacrylic acid

Details Water soluble films of polyvinyl alcohol and polyacrylic acid Water soluble films of polyvinyl alcohol and polyacrylic acid

C - Chemistry, Metallurgy

08

L

18/1032, 400/655

C08L 29/04 (2006.01) C08J 5/18 (2006.01) C08L 33/02 (2006.01) C11D 17/04 (2006.01)

Patent

CA 1197340

ABSTRACT OF THE DISCLOSURE Films which are rapidly soluble in cold and warm water are formed from blends of water soluble polyvinyl alcohol (partially hydrolyzed polyvinyl acetate) and polyacrylic acid. The polymers are compatible and form homogeneous mixtures from which clear, transparent, non-tacky, easily handleable, mechanically strong films can be formed. The films are stable at both low and high humidity conditions, i.e., the films do not become brittle or tacky and retain their high rates of dissolution in water even after being stored in low or high humidity environments at both high and low temperatures. Further, improvements are achieved by incorporating a plasticizer into the polymer blend. The films are also heat sealable and biodegradable and are most useful in packaging applications, such as for dry detergents and similar water soluble commodities.

392178

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