Filtermaterial, insbesondere für Filtration von Blut

摘要

A filter material for filtering leucocytes from a fraction of or whole human blood, comprises a textile web having a thickness of between about 2 millimeters to about 12 millimeters and a bulk density of about 0.05 to 0.4 g/cm<3>. 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 cross-over 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.