초록 ▼

A cationic charge modified microporous membrane comprising a hydrophilic organic polymeric microporous membrane and a cationic charge modifying agent bonded to substantially all of the wetted surfaces of the membrane, the charge modifying agent being an epichlorohydrin modified polyamide having tert

A cationic charge modified microporous membrane comprising a hydrophilic organic polymeric microporous membrane and a cationic charge modifying agent bonded to substantially all of the wetted surfaces of the membrane, the charge modifying agent being an epichlorohydrin modified polyamide having tertiary amine or quaternary ammonium groups. A secondary charge modifying agent may be employed selected from: (i) aliphatic polyamines having at least one primary amine or at least two secondary amines; and (ii) aliphatic amines having at least one secondary amine and a carboxyl or hydroxyl substituent. Processes for producing and using the membrane are also described.

대표청구항 ▼

A process for the filtration of particulates from a liquid comprising passing the liquid through a hydrophilic, cationic charge modified microporous filter membrane comprising: a substantially isotropic, porous, hydrophilic, microporous cast nylon film membrane having a microstructure throughout sai

A process for the filtration of particulates from a liquid comprising passing the liquid through a hydrophilic, cationic charge modified microporous filter membrane comprising: a substantially isotropic, porous, hydrophilic, microporous cast nylon film membrane having a microstructure throughout said membrane; and a polyamido-polyamine epichlorohydrin cationic charge modifying agent having tertiary amine or quaternary ammonium groups, said agent being bonded to substantially all of said membrane microstructure without substantial pore size reduction or pore blockage, whereby the particulates are removed from the liquid by retention by the cationic charge modified membrane.