Process for preparing a microporous membrane and such a...

Details Process for preparing a microporous membrane and such a... Process for preparing a microporous membrane and such a...

C - Chemistry, Metallurgy

08

J

18/19

C08J 9/26 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01)

Patent

CA 2015413

The invention relates to a process for preparing a microporous membrane, starting from a mixture of at least a hydrophobic polymer and a hydrophilic polymer, by dissolving these polymers first in a suitable solvent or mixture of solvents and subsequently by coagulating 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. The 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.

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