Patent ID: 9707524
Date: 2017-07-18
CPC Classifications: B01D,C08L

Claim:
1. A polymeric membrane having uniform stable hydrophilicity and uniform pore size useful as a water microfiltration or ultrafiltration membrane consisting of a stable, uniform blend of: a) 99-20 weight percent of a hydrophobic matrix polymer, said matrix polymer comprises a polyvinylidene fluoride homopolymer, or a polyvinylidene copolymer comprising at least 50 mole percent of vinylidene fluoride monomer units, b) 1-80 weight percent of an amphiphilic block copolymer having 1) at least one hydrophilic bock and 2) at least one hydrophobic block compatible with said polymer matrix, wherein said hydrophilic and hydrophobic blocks comprise acrylic polymers, wherein said hydrophilic block is a gradient copolymer having two or more different monomer units, and wherein said hydrophilic block comprises one or more monomer units selected from the group consisting of hydroxyethyl acrylate, hydroxyethyl methacrylate, polyethylene glycol acrylate (PEGA), polyethyeleneglycol-methylether acrylate (MPEGA), polyethylene glycol methacrylate (PEGMA), polyethyleneglycol-methylether-methacrylate (MPEGMA), acrylamido 2-methyl 2-propane sulfonate, styrene sulfonic acid and itaconic acid, and c) optionally one or more hydrophilic additives selected from the group consisting of polyethylene-glycol (PEG), polyethylene glycol methacrylate (PEGMA), propylene glycol (PG), polyacrylic add (PAA), and polymethacrylic acid (PMA); wherein said polymeric membrane has a maximum pore size of less than 0.3 um, and wherein said block copolymer is a controlled radical polymerized copolymer.