Water soluble films of polyvinyl alcohol and polyvinyl...

Details Water soluble films of polyvinyl alcohol and polyvinyl... Water soluble films of polyvinyl alcohol and polyvinyl...

C - Chemistry, Metallurgy

08

L

400/6521

C08L 29/04 (2006.01) C08J 5/18 (2006.01) C08L 39/06 (2006.01)

Patent

CA 1191649

WATER SOLUBLE FILMS OF POLYVINYL ALCOHOL AND POLYVINYL PYRROLIDONE 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 polyvinyl pyrrolidone. The polymers are compatible and form homogeneous mixtures from which clear, transparent, non-tacky, easily handleable, mechani- cally 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 useful as packaging, particularly for packaging dry detergents and similar water soluble commodities. -1-

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