Polyvinyl alcohol compositions prepared by crosslinking in a freezing step
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United States of America Patent
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Oct 26, 1999
Issued Date -
N/A
app pub date -
Dec 23, 1997
filing date -
Aug 13, 1992
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Expired
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Abstract
The invention provides a translucent, water-insoluble hydrogel composition and methods of making it. The hydrogel composition comprises a polyvinyl alcohol polymer and a complexing agent which are physically crosslinked to form a semi-crystalline polyvinyl alcohol-complexing agent polymer complex. This is achieved by: (i) combining a polyvinyl alcohol polymer with a suitable aprotic solvent; (ii) Adding a complexing agent to (i) to form a water soluble complex with the polyvinyl alcohol polymer; and (iii) Allowing the polyvinyl alcohol polymer and the complexing agent to form a water-insoluble, semi-crystalline structure. The formation of the semi-crystalline structure is assisted by freezing the polyvinyl alcohol/complexing agent/polar aprotic solvent mixture.
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