Ultrafiltration membranes fabricated from sulfonated polyphenylenesulfones

摘要

The present invention is directed to ultrafiltration membranes comprising a membrane substrate layer (S) based on a sulfonated polyaryleneethersulfone polymer and to a method for their preparation. Furthermore, the present invention is directed to ultrafiltration processes making use of said membrane.

主权项

1. An ultrafiltration membrane consisting of at least one membrane substrate layer (S) that represents a sponge-like and macrovoid-free structure and comprises as the single membrane forming polymeric material at least one partially sulfonated polyethersulfone polymer (P1), wherein said polymer (P1) comprises non-sulfonated and sulfonated repeating units and wherein in said partially sulfonated polyethersulfone polymer (P1) about 0.5 to 4.5 mole-% of the monomeric constituents or repeating units of the polymer carry at least one sulfonate group, wherein said partially sulfonated polyethersulfone polymer (P1) is a polyaryleneethersulfone polymer and its repeating units are composed of monomeric units of the general formulae
O—Ar  (M2) wherein Ar represents a divalent arylene residue, at least one monomeric unit selected from 1 and M2 is sulphonated and the aromatic rings as contained in M1 and M2 optionally and independently of each other is optionally further substituted; and wherein said partially sulfonated polyethersulfone polymer (P1) is obtained by polymerizing monomers of the general formulae M1a and M2a
HO—Ar—OH  (M2a) wherein Ar represents a divalent arylene residue, and Hal is F, Cl, Br or I and at least one sulphonated monomer of the general foimulae M1b and M2b wherein Hal and Ar are as defined above, and n and m independently are 0, 1 or 2, provided that n and m are not simultaneously 0, wherein the substrate layer (s) has a layer thickness in the range of 30-400 μm.