Filter media

B - Operations – Transporting – 01 – D

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183/110, 117/43

B01D 39/02 (2006.01) B01D 39/20 (2006.01)

Patent

CA 1190156

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 pre- ferred microfiber and polyamine-epichlorohydrins the preferred resins. By providing the normally negative zeta potential microfibers with a positive zeta poten- tial the binder resins used to coat the microfibers substantially enhance particulate removal capabilities of the microfiber filter sheet.

413608

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