Crosslinked seeded copolymer beads and process of manufacture

Details Crosslinked seeded copolymer beads and process of manufacture Crosslinked seeded copolymer beads and process of manufacture

1994-10-27

1997-04-01

Zitomer, Fred

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Ion-exchange polymer or process of preparing

521 28, 525244, 525247, 525261, 525263, 525344, 525355, 525357, B01J 3918, C08F 836, C08F 838, C08F 818

Patent

active

056166222

ABSTRACT:
Seeded cation-exchange resin beads are particularly susceptible to oxidative degradation which results in the leaching of organic carbon fragments. The leachability of organic carbon fragments of molecular weights greater than 1000 g/mol is reduced to less than 800 ppm by effectively crosslinking the copolymers that comprise the seeded cation-exchange resin beads. Crosslinking can be achieved either during sulfonation by increasing sulfone bridge formation or before sulfonation by either alkylene bridge formation or by incorporation and subsequent activation of a crosslinkable functionality in the copolymer that forms the seed in the seeded polymer bead process.

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D.H. Freeman, "Homogeneous Sulfonation of Styrene-Divinylbenzene Copolymers with Oleum in Organic Solvents," Israel Journal of Chemistry, vol. 7, 1969, pp. 741-749.
S. Goldstein, and G. Schmuckler, "Sulfone Formation During the Sulfonation of Crosslinked Polystyrene," Ion Exchange and Membranes, vol. 1, 1972, pp. 63-66.
E. Helfferich, "Ion Exchange", (1962) 53 (New York) McGraw-Hill.

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