Macroporous ion exchange resins
Assignee3M Innovative Properties Company
InventorsJerald K. Rasmussen, James I. Hembre
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Abstract
Ion exchange resins are described that are hydrophilic, crosslinked (meth)acrylic copolymers. The ion exchange resins are macroporous, have a surface area of at least 50 m2/g, and an average particle size of at least 20 micrometers. Additionally, chromatographic columns containing the ion exchange resins, composite materials containing the ion exchange resin, filtration elements containing the ion exchange resin, methods of preparing the ion exchange resins, and methods of separating or purifying negatively or positively charged materials with the ion exchange resins are described.
Claims18
An anion exchange resin that is a reaction product of a monomer mixture dissolved in an aqueous phase, the monomer mixture comprising
- (a) a N,N′-alkylenebis(meth)acrylamide crosslinking monomer in an amount greater than 25 weight percent based on a total weight of monomers in the monomer mixture;
- (b) an ionic monomer in an amount of at least 35 weight percent based on a total weight of monomers in the monomer mixture, each ionic monomer having a group capable of interacting with a negatively charged material, wherein the monomer mixture is free of an ionic monomer having a group capable of interacting with a positively charged material;
- (c) 0 to no greater than 1 weight percent based on the total weight of monomers in the monomer mixture of a hydrophobic monomer having a lipophilicity index greater than 20,
- wherein each monomer in the monomer mixture is a (meth)acrylate monomer, a (meth)acrylamide monomer, or derivative thereof;
- wherein said anion exchange resin is in the form of macroporous particles having an average size of at least 20 micrometers and a surface area of at least 50 m2/g.
An ion exchange resin comprising the reaction product of a monomer mixture that is substantially free of a monomer having a lipophilicity index greater than 20, said monomer mixture comprising
- (a) a N,N′-alkylenebis(meth)acrylamide crosslinking monomer in an amount greater than 25 weight percent based on a total weight of monomers in the monomer mixture;
- and
- (b) an ionic monomer in an amount of at least 35 weight percent based on a total weight of monomers in the monomer mixture, the ionic monomer comprising a weak base, a strong base, a salt of a weak base, a salt of a strong base, or combinations thereof, wherein the ionic monomer comprises a dialkylaminoalkylamine adduct of alkenylazlactone,
- wherein said ion exchange resin is in the form of macroporous particles having an average size of at least 20 micrometers and a surface area of at least 50 m2/g.
An anion exchange resin that is a reaction product of a monomer mixture dissolved in an aqueous phase, the monomer mixture comprising
- (a) a N,N′-alkylenebis(meth)acrylamide crosslinking monomer in an amount greater than 25 weight percent based on a total weight of monomers in the monomer mixture;
- (b) an ionic monomer in an amount of at least 35 weight percent based on a total weight of monomers in the monomer mixture, wherein each ionic monomer is selected from N,N-dialkylaminoalkyl(meth)acrylate, (meth)acrylamidoalkyltrimethylammonium salt, (meth)acryloxyalkyltrimethylammonium salt, or combinations thereof, wherein the monomer mixture is free of an ionic monomer having a group capable of interacting with a positively charged material;
- (c) 0 to no greater than 1 weight percent based on the total weight of monomers in the monomer mixture of a hydrophobic monomer having a lipophilicity index greater than 20,
- wherein each monomer in the monomer mixture is a (meth)acrylate monomer, a (meth)acrylamide monomer, or derivative thereof.
Dependencies are inferred from the claim text.