http://rdf.ncbi.nlm.nih.gov/pubchem/patent/KR-20090013190-A

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publicationDate 2009-02-04-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber KR-20090013190-A
titleOfInvention Crystalline polymer microporous membrane, method for producing same, and filter for filtration
abstract To provide a membrane capable of efficiently trapping fine particles over a long period of time. A polytetrafluoroethylene microporous membrane, wherein the average pore diameter of the surface of the membrane is larger than the average pore diameter of the back surface, and the average pore diameter is continuously changed from the surface toward the back surface.n n n Crystalline polymer microporous membrane, filtration filter, unbaked film, semi-calcination process, heating roll
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