Interface beads for mixed-bed ion exchange resins
AssigneeThe Dow Chemical Company
InventorYohannes Chonde
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Abstract
Improved beads for use in the interfacial separation of anion and cation exchange beads are spherical, hydrolytically stable polymer beads having a controlled particle size, controlled density and a water wettability. The beads comprise a hydrophobic monomer, a hydrophilic monomer and a crosslinking monomer. The interface beads allow for the preparation of mixed-bed exchange resin compositions having improved life cycles and improved resin efficiencies.
Claims19
A bead for a cation and anion mixed-bed ion exchange resin composition, which bead is an essentially spherical, hydrolytically stable polymer bead having a controlled particle size, a controlled density and a water wettability, wherein said bead comprises the polymerization product of a major amount of at least one monoethylenically unsaturated hydrophobic monomer, at least one polyethylenically unsaturated monomer, and minor amount of a monoethylenically unsaturated ionizable hydrophilic monomer which contains anionic or cationic moieties such that said bead does not exhibit a significantly titratable amount of hydrophilic moieties.
Dependencies are inferred from the claim text.