Hydrophilically modified fluorinated membrane (VI)
AssigneePall Corporation
InventorsMarcin Stasiak, Hassan Ait-Haddou
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Abstract
Disclosed are copolymers suitable for hydrophilically modifying the surface of porous fluoropolymer supports, for example, a copolymer of the formula (I) or (II): wherein Rf, Rh, Ra, Y, m, and n are as described herein. Also disclosed are a method of preparing the copolymers, a method of hydrophilically modifying porous fluoropolymer supports, hydrophilic fluoropolymer porous membranes prepared from the polymers, and a method of filtering fluids through the porous membranes.
Claims20
A composite hydrophilic porous membrane comprising a porous fluoropolymer support and a coating comprising a copolymer of formula (I) or (II):
- wherein the copolymer of formula (I) or (II) is independently a random or block copolymer, Rf is a perfluoro-substituted group, whereas Rh is a hydrophilic group or chlorine, Ra is methyl or ethyl, m and n are independently from 10 to 1000, X is an alkyl group, and Y is reactive functional group, wherein the coating is optionally crosslinked.
A method of hydrophilically modifying a porous fluoropolymer support comprising:
- (i) providing a porous fluoropolymer support;
- (ii) coating the porous fluoropolymer support with a solution comprising a solvent and a copolymer of formula (I) or (II):
- wherein the copolymer of formula (I) or (II) is independently a random or block copolymer, Rf is a perfluoro-substituted group, whereas Rh is a hydrophilic group or chlorine, Ra is methyl or ethyl, m and n are independently from 10 to 1000, X is an alkyl group, and Y is reactive functional group,
- (iii) drying the coated support from (ii) to remove at least some of the solvent from the coating comprising a solvent and the copolymer;
- and optionally
- (iv) crosslinking the copolymer present in the coating.
Dependencies are inferred from the claim text.