Water soluble films of polyvinyl alcohol and polyacrylic acid an

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

1981-08-13

1987-09-08

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

524377, 524388, C08L 2904

Patent

active

046924949

ABSTRACT:
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.

REFERENCES:
patent: 2850471 (1958-09-01), Klein
patent: 3634295 (1972-01-01), Dunlap et al.

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