Vinyl alcohol copolymers and water-soluble films containing them
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United States of America Patent
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Jun 22, 1999
Grant Date -
N/A
app pub date -
Jan 15, 1997
filing date -
Jul 21, 1994
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Abstract
The description relates to vinyl alcohol copolymers which can be produced by the acid-catalysed acetalisation reaction of polyvinyl alcohols with a degree of saponification of 80-99.5 mol % and preferably between 88 and 99.5 mol % with natural substances or their derivatives containing carbonyl or presumptive carbonyl groups. The description also relates to water-soluble films containing such vinyl alcohol copolymers, the solubility of which can be adjusted to the desired solution temperature. Said water-soluble films are used as packaging materials and auxiliaries, e.g. in the form of sealing lacquers.
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