Medical material of polyvinyl alcohol and process of making
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United States of America Patent
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-
Mar 29, 1988
Issued Date -
N/A
app pub date -
Mar 28, 1985
filing date -
Sep 25, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Provided is a medical material comprising a molded hydrogel obtained by pouring an aqueous solution containing not less than 6 wt. % of a polyvinyl alcohol which has a degree of hydrolysis not less than 97 mole % and average polymerization degree not less than 1,100, into a desired shape of a vessel or mold, freeze-molding the aqueous solution at a temperature lower than -5.degree. C., then partially dehydrating the resulting molded product without thawing it up to a percentage dehydration not less 5 wt. %, and if required, immersing the partially dehydrated, molded product in water to attain a water content thereof in the range of 45 to 95 wt. %.
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