Process for preparing cold water-soluble films from PVA by melt extrusion
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United States of America Patent
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-
May 12, 1981
Issued Date -
N/A
app pub date -
Aug 25, 1978
filing date -
Jan 3, 1974
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Films, 0.5-10 mils thick, which are rapidly and completely soluble in cold water, and which are suitable for use as packaging film in automatic packaging equipment, can be prepared by conventional melt extrusion processes when prepared from a novel composition consisting essentially of 5-20 parts by weight of a polyethylene glycol (having an average molecular weight in the range between 325 and 550) in 100 parts by weight of a partially hydrolyzed low molecular weight polyvinyl alcohol.
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