Processes of making porous membranes and the membrane products

Details Processes of making porous membranes and the membrane products Processes of making porous membranes and the membrane products

C - Chemistry, Metallurgy

08

J

18/24

C08J 9/28 (2006.01) B29C 67/20 (2006.01)

Patent

CA 1118559

PROCESSES OF MAKING POROUS MEMBRANES AND THE MEMBRANE PRODUCTS Abstract This invention covers a continuous process for making a polymeric membrane having at least 60% or more of its volume taken up by intercommunicating pores of substantially uniform size below about 25 micrometers. The process consists of applying a layer of a polymer solution on a rigidly supported backing belt, then passing the belt through a formation bath that includes solvent plus a non-solvent for the polymer that is miscible with its solvent. The bath is recirculated at a substantially constant, preselected composition. The porous structure of the membrane is sub- stantially completely formed in the formation bath. The process includes extracting any residual solvent from the porous membrane, then drying the membrane. To produce membrane material of consistent, uniform characteristics and quality, the formation bath is maintained at the pre- selected composition. Either skinned molecular filtration membranes or microporous membranes may be produced by adjust- ing process parameters, such as the composition of the forma- tion bath.

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