Liquid purification or separation – Filter – Material
Patent
1981-10-19
1985-06-18
Wyse, Thomas
Liquid purification or separation
Filter
Material
210505, 210509, B01D 1300
Patent
active
045239959
ABSTRACT:
Filter media comprised of charge modified, resin coated inorganic microfibers are prepared by mixing inorganic microfibers with an aqueous solution of a water soluble, noncolloidal cationic thermosetting binder resin to form a dispersion, following which a precipitating agent is added to precipitate the binder resin and coat the microfibers. The coated microfibers may be used in the dispersed or suspended form as a filter aid. Preferably they are formed into a filter sheet which is then dried and cured to form a filter sheet of narrowly distributed pore size, pore sizes as small as one-half micron, and having a positive zeta potential in alkaline media. Glass is the preferred microfiber and polyamine-epichlorohydrins the preferred resins. By providing the normally negative zeta potential microfibers with a positive zeta potential the binder resins used to coat the microfibers substantially enhance particulate removal capabilities of the microfiber filter sheet.
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Degen Peter J.
Foss Warren M.
Gsell Thomas C.
Joffee Irving B.
Pall David B.
Pall Corporation
Wyse Thomas
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