Abstract: A process for producing a strong acid cation exchange resin having enhanced thermal stability comprises the steps of (1) chlorinating or brominating the aromatic nuclei of polymer beads prepared from a monomer system selected from the class consisting of (a) monovinyl aromatic monomers and polyvinyl aromatic monomers and mixtures thereof and (b) one or more monomers of (a) with up to about 5% by weight of the polymer of a monomer selected from the class consisting of acrylonitrile, methyl acrylate, methyl methacrylate, and mixtures thereof, and when a monovinyl aromatic monomer is present, a polyvinyl aromatic monomer is also present in an amount of at least about 4% by total weight of the polymer or copolymer, and (2) sulfonating the chlorinated or brominated polymer to produce a resin having enhanced thermal stability. A strong acid cation exchange resin prepared by the above process wherein the aromatic nuclei of the polymer beads are chlorinated or brominated.

Abstract: Quinolizinium resins may be produced by quaternizing substituted vinyl pyridine polymers followed by subjecting the resulting product to a condensation reaction to obtain quinolizinium functionality. The resins are useful as ion exchange resins, adsorbents and catalysts.