Method of cleaning or purifying elastomers and elastomeric articles which are intended for medical or pharmaceutical use
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United States of America Patent
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Jun 5, 2001
Grant Date -
N/A
app pub date -
Sep 25, 1998
filing date -
Apr 10, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method is disclosed for removing impurities from an elastomer intended for medical or pharmaceutical use, which includes a step of performing a first solvent extraction process on the elastomer by contacting the elastomer with a first extracting solvent in a non-supercritical state to substantially remove impurities from the elastomer, thereby leaving a residue of said first extracting solvent in the elastomer. The elastomer is there after subjected to a second solvent extraction process, by contacting the elastomer with a second extracting solvent, which is a supercritical fluid or a mixture of super critical fluids, in order to remove substantially reduce the concentration of the residue of the first extracting solvent remaining in the elastomer after the first solvent extraction process.
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