Uniform polymer beads and ion exchange resins therefrom prepared

Details Uniform polymer beads and ion exchange resins therefrom prepared Uniform polymer beads and ion exchange resins therefrom prepared

1978-07-24

1980-03-11

Schofer, Joseph L.

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

Synthetic resins

Ion-exchange polymer or process of preparing

525330, B01J 122, C08F21236, C08J 324, C08F21210

Patent

active

041929209

ABSTRACT:
Polymer beads of uniform size are prepared by (a) forming linear polymer beads of a vinyl aromatic polymer containing about 0.8-2.0 chloromethyl groups per aromatic nucleus, (b) removing off-sizes from the linear polymer beads to leave beads of a desired size, (c) recycling the off-sizes into the formation of the linear polymer beads, as required to obtain higher counts of uniform beads, and (d) lightly crosslinking the desired size beads by a thermal treatment to stabilize the beads. Strong base anion exchange resins are produced from the lightly crosslinked beads by swelling the beads in an organic solvent, post-crosslinking the swollen beads with a Friedel-Crafts catalyst, and aminating the post-crosslinked beads. Suitable starting monomers are vinylbenzyl chloride, bis(chloromethyl)styrene and vinyltoluene.

REFERENCES:
patent: 3417066 (1968-12-01), Corte et al.
patent: 3755281 (1975-08-01), Busby et al.
patent: 3812061 (1974-03-01), Barrett
patent: 3822244 (1974-07-01), Peyrot
patent: 3872067 (1975-03-01), Harris
patent: 3879328 (1975-04-01), Jones
patent: 3922255 (1975-11-01), Koestler et al.

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