B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 39/14 (2006.01) A61M 1/00 (2006.01) B01D 39/08 (2006.01) B01D 39/16 (2006.01) D04H 1/54 (2006.01) D04H 1/58 (2006.01)
Patent
CA 2115531
A filter material (1) for filtering leucocytes from a fraction of or whole human blood, comprises a textile web having a thickness (T) of between about 2 millimeters to about 12 millimeters and a bulk density of about 0.05 to 0.4 g/cm3. The web has a plurality of interlocked textile fibers (5) with average deniers between about 0.05 and 0.75 and average lengths between about 3 millimeters and 15 millimeters. The textile fibers are distributed in the web to form a matrix thereof with spaces between adjacent interstices of interlocked fibers. A plurality of fibrillated particles (10) 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 (10) to the textile fibers (5} is between about 1:99 and 40:60. A plurality of glass fibers (8), having an average diameter of between 0.1 and 5 microns and being about 2% to 85% of the web, also form part of the matrix. A thermoplastic binder (4) is disposed at least at crossover portions (9) of the matrix textile fibers (5) and matrix glass fibers (8), with the amount of the binder being about 0.1% to 20% by weight of the web.
Heagle David G.
Hiers John J.
Lydall Inc.
Oyen Wiggs Green & Mutala Llp
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