A process for preparing a microporous membrane and such a membrane.

摘要

Starting from a mixture of at least a hydrophobic polymer and a hydrophilic polymer, these polymers are first dissoved in a suitable solvent or mixture of solvents and subsequently coagulated in a coagulation bath. According to the invention a more or less hydrophilic membrane is prepared by removing the membrane so obtained from the coagulation bath and subsequently by leaching at least a part of the hydrophilic polymer from the matrix, alternatively followed by hydrophobisation. Said leaching of the hydrophilic polymer occurs by treatment of the membrane with an oxidising/hydrolising agent. The invention furthermore comprises microporous membranes, flat or tubular or in the form of hollow fibers, having a good chemical resistance and good mechanical strength.