Cationic charge modified microporous membranes

Abstract From the Canadian patent

Cationic charged semihydrophobic polyethersulfone (CSHP) membranes having hydrophilic and semihydrophobic properties are provided, as wall as preparation of the same by post-treatment. Typically as an illustration, a microporus hydrophilic polyethersulfone membrane substrate which contains non-teachable polymeric additive having functional groups is treated in an alkaline solution for simultaneous or sequential reaction with 1) a primary charge modifying agent which is an epichlorohydrin modified polyamine and 2) a secondary , polymeric charge modifying agent containing a positive charge (or for reaction with the primary charge modifying agent alone); then baked until cured at elevated …