Gambro Lundia Ab

Gambro Dialysatoren Kg

Gunther F Geiling

Hermann Josef Gohl

Claes-Ake Gullberg

Georg B Mayer

A filtration membrane is disclosed which has an ultrafiltration rate of between 200.times.10.sup.-4 and 500.times.10.sup.-4 ml/sec..times.cm.sup.2 .times.bar at 20.degree. C. and which is substantially impermeable to albumin of a molecular weight of about 44,000 or greater. A process for producing a filtration membrane is also disclosed in which a polymer solution is extruded with a center liquid under conditions such that the ratio of the volume of polymer solution to the volume of center liquid is within the range of from about 2:1 to about 4:1 to form a membrane extrudate.

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Hechingen, Germany

Gunther F Geiling