Método para formar membranas de ultrafiltración compuestas de múltiples capas

摘要

The present invention is an integral multilayered composite membrane having at least one ultrafiltration layer made by cocasting or sequentially casting a plurality of polymer solutions onto a support to form a multilayered liquid sheet and immersing the sheet into a liquid coagulation bath to effect phase separation and form a multilayered composite membrane having at least one ultrafiltration layer. Asymmetric ultrafiltration layer exposes wider pore side to feed. Separation of viruses and proteins are carried out using hydrophilic polymers.