Polymeric articles and methods of manufacture thereof
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United States of America Patent
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Jan 26, 1988
Issued Date -
N/A
app pub date -
Apr 30, 1986
filing date -
May 18, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention provides a method for the preparation of an article from a blend of at least two molecularly compatible polymers by treating the blend with a solvent which is a solvent for one of the polymers and a non-solvent for the other. The solvent can be removed while the article is restrained from undergoing substantial shrinkage, in which case a microporous article is obtained. Alternatively, the solvent can be removed while the article is permitted to shrink. In this case high shrinkage force (also referred to as recovery force) results which can be utilized to apply the article to a substrate. The final and intermediate articles are novel. In a preferred embodiment, the invention provides a microporous article having an average pore size of about 0.005 microns to about 1 micron.
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