B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 71/34 (2006.01) A61L 2/02 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 69/04 (2006.01) B01D 69/10 (2006.01) C08J 7/18 (2006.01)
Patent
CA 2128296
The present invention provides an isotropic, skinless, porous, polyvinylidene fluoride membrane having a KUF of at least about 15 psi, and preferably below about 50 psi, when tested using liquid pairs having an interfacial tension of about 4 dynes/cm. The present inventive membrane preferably has a titer reduction of at least about 108 against T1 bacteriophage, more preferably also against PR772 coliphage, and even more preferably also against PP7 bacteriophage. The present inventive membrane can have a thickness of about 20 mils or less and even as low as about 5 mils or less. The present invention also provides a method of preparing such a membrane by providing a casting solution comprising polyvinylidene fluoride and a solvent therefor, heating the casting solution to a uniform temperature of about 57 °C to about 60 °C, spreading the casting solution onto a substrate to form a film, quenching the film in a quench bath so as to form a porous membrane, and washing and drying the porous membrane.
Degen Peter John
Gregg Joseph
Rapisarda Gregory C.
Sipsas Ioannis P.
Marks & Clerk
Pall Corporation
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