Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Ion-exchange polymer or process of preparing
Patent
1979-08-23
1981-05-26
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Ion-exchange polymer or process of preparing
C08F 822, C08F 836
Patent
active
042699436
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.
REFERENCES:
patent: 3256250 (1966-06-01), Trilette
Driks Jordan J.
Kulkosky Peter F.
Rohm and Haas Company
Schofer Joseph L.
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