Filter for Removing Substances from Blood or from Blood Derivatives, and a Method for Obtaining It
a filter and substance technology, applied in the field of filtering substances, can solve the problems of increased pressure drop across, reduced platelet adhesion phenomenon of blood filtration, and low surface tension, and achieves high leukocyte retention, low undesired release, and high platelet retention
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example 1
[0032]A dispersion of polyurethane of number average molecular weight between 12 and 18 kDa in water was used, with a polymer content of 5% by weight. This dispersion was obtained by the following process: the polyol and isocyanate components are dissolved in a ketonic solvent, then dispersed in water; the solvent is finally removed by distillation.
[0033]The polyurethane coating was applied to a non-woven fabric of PBT by immersion in the dispersion maintained at ambient temperature. Drying was carried out at 60° C. After 20 hours of drying, it was washed in osmotized water at 50° C. Subsequent drying was carried out at 60° C.
example 2
[0034]A dispersion of polyurethane of number average molecular weight between 12 and 18 kDa in water was used, obtained by diluting at ambient temperature a polyurethane dispersion in water, with a PU content of 50% by weight and with the further addition of water to attain a polymer content of 0.5% by weight.
[0035]The polyurethane was NORETHANE WB 8301 produced by the firm NOVOTEX ITALIANA SPA.
[0036]The polyurethane coating was applied to a non-woven fabric of PBT by immersion in the dispersion maintained at ambient temperature. Drying was carried out at 50° C. After 20 hours of drying, it was washed in osmotized water at 45° C. Subsequent drying was carried out at 30° C.
example 3
[0037]A dispersion of polyurethane of molecular weight between 12 and 18 kDa in water was used, with a polymer content of 5% by weight.
[0038]The polyurethane coating was applied to a non-woven fabric of PBT by immersion.
[0039]Drying was carried out at 100° C.
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