Hydrophobic membranes
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United States of America Patent
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-
Aug 3, 1993
Issued Date -
N/A
app pub date -
Oct 23, 1992
filing date -
May 15, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for the preparation of a microporous polymeric membrane is provided which includes polymerizing a polymerizable fluorine-containing monomer in the presence of a microporous polymeric membrane substrate such that the fluorine-containing monomer forms a polymeric superstrate that is permanently chemically bonded to all surfaces of the membrane. A device is also provided for processing fluids which incorporates a microporous polymeric membrane having a CWST of less than about 28 dynes/cm and includes a microporous polymeric membrane substrate formed from a material such as a fluoropolymer and, permanently chemically bonded to all portions of the surface thereof is a superstrate, which may be a polymer or copolymer derived from a monomer(s), having an ethylenically unsaturated group and a perfluoroalkyl group. A gas filtration/drying process, a method of venting a gas from a vessel and a method of separating a gas from a liquid in a gas/liquid mixture using a microporous polymeric membrane having a CWST less than about 28 dynes/cm which includes a microporous polymeric membrane substrate and a superstrate fluoropolymer permanently chemically bonded to all portions of the membrane substrate are also provided.
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