Claims
- 1. A method of permanently providing a granular coating of inert inorganic particles onto the surface of chemically inert fibers which form a gas permeable felt whereby said felt will be wettable in aqueous solutions comprising the steps of:
- (a) first providing a porous organic felt containing fibers whose surfaces are free of contamination;
- (b) applying a uniform coating of inert inorganic particles to the surface of said felt and throughout the interstices of said fibers by vacuum back-filling said felt with a suspension of porous inorganic particles in a carrier fluid; and
- (c) heating said particle-coated felt to a temperature slightly less than the melting point of said fibers whereby said fibers will soften and absorb said particles to the said surface thereby providing a permanently attached granular inorganic particle-coated fibrous felt.
- 2. A process in accordance with claim 1 wherein said fibers are selected from the group consisting of tetrafluoroethylene, fluorinated ethylene propylene, chlorotrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, polyethylene, and polypropylene.
- 3. A process in accordance with claim 1 wherein said fibers are polypropylene.
Parent Case Info
This is a division of application Ser. No. 128,747, filed Mar. 10, 1980, now U.S. Pat. No. 4,277,547, patented July 7, 1981.
US Referenced Citations (5)
Divisions (1)
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Number |
Date |
Country |
Parent |
128747 |
Mar 1980 |
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