Hollow fiber membrane for filtration of liquids

A process for preparing an intrinsically anti-microbial hollow fiber membrane comprising a polymer or polymer mix dope solution absent an anti-microbial substance, wherein the dope solution comprises 3% to 25% polyethersulfone, 5% to 15% polyvinylpyrrolidone, 0 to 40% polyethylene glycol, 40% to 80% N-methyl pyrrolidone solution;

• 3% to 25% polyethersulfone and 5% to 15% polyvinyl pyrrolidone;
• or the dope solution comprises an aqueous lithium chloride solution, polycarbonates, polyamides, and aqueous isopropyl or any combination thereof, wherein the percentages are in weight ratio;
• the process comprising the steps of:
• a) mixing an anti-microbial substance embedded polymer or anti-microbial substance embedded polymer mix with the polymer or a polymer mix dope solution absent of an anti-microbial substance with a pore former comprising polyethylene glycol and other additives, with a solvent for all constituents;
• and
• b) passing the mixture produced in step a) through a spinneret together with a nonsolvent for the polymers:
• wherein the anti-microbial substance is a metal oxide, metal salt or metal, and the embedded polymer or polymer mix is from 2-5% by weight of total polymers in the mixture formed in step a).