Liquid purification or separation – Filter – Material
Patent
1994-02-22
1995-10-03
Kim, John
Liquid purification or separation
Filter
Material
210504, 210505, 210508, 210509, 428283, 428285, 428286, 428287, 428323, 428327, B01D 3902, B01D 3904, B01D 3906, B01D 3908
Patent
active
054549469
ABSTRACT:
A filter material for filtering leucocytes from a fraction of or whole human blood, comprises a web having a thickness of at least about 1 millimeter and a bulk density of about 0.05 to 0.4 g/cm.sup.3. The web has a plurality of interlocked matrix fibers distributed in the web to form a matrix thereof with spaces between adjacent interstices of interlocked fibers. The matrix fibers are composed mainly of about 1 to 3 micron diameter glass fibers, i.e. at least 75% of the weight of the web being the glass fibers. A plurality of fibrillated particles of textile fiber material, having a surface area of between 5 and 100 square meters per gram are disposed within the spaces of the matrix. The weight ratio of the fibrillated particles to the matrix fibers is between about 1:99 and 40:60. A thermoplastic binder is disposed at least at cross-over portions of the matrix fibers, with the amount of the binder being about 0.1% to 10% by weight of the web.
REFERENCES:
patent: 4274914 (1981-06-01), Keith et al.
patent: 4889764 (1989-12-01), Chenoweth et al.
patent: 4904343 (1990-02-01), Giglia et al.
patent: 5190657 (1993-03-01), Heagle et al.
patent: 5290449 (1994-03-01), Heagle et al.
Heagle David G.
Hiers John J.
Kim John
Lydall, Inc.
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