Pore size control using plasma polymerization techniques
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United States of America Patent
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Feb 21, 1989
Grant Date -
N/A
app pub date -
Apr 11, 1986
filing date -
Apr 11, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hydrophobic microporous membrane substrate can be coated with a plasma polymerizate coating in order to reduce the pore size of the substrate to a size smaller than the original pore size but not less than about 10 A. By selecting the particular plasma polymerizate coating, the surface of the substrate may be rendered either hydrophilic or hydrophobic, while the body of the substrate retains the substrate's original properties of mechanical strength and chemical resistance. Three different methods of applying plasma polymer coatings by plasma polymerization techniques are disclosed. These membranes are suitable for separating particulate larger than about 10 A from solutions. These membranes in the form of hollow fibers can be incorporated into separatory modules.
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