| 摘要 |
Compounds represented by the formula <IMAGE> and addition polymers thereof where m is an integer from 2 to about 10, X- is chlorine, hydroxy, carboxy or -AC-R)=CH2 -R is hydrogen or methyl, -R' is an ethylene or propylene group and -AC-R)=CH2 is one of <IMAGE> These compounds and their addition polymers form complexes with alkali metal or alkaline earth metal salts and permit the concentration of aqueous solutions of said salts. For example, a compound of the formula <IMAGE> is polymerized with an azobis(isobutyronitrile) catalyst to form addition polymers of the repeating unit <IMAGE> When cross-linked, rendering it water-insoluble, such an addition polymer concentrates an aqueous solution of sodium chloride when contacted with same at about 0 DEG C.
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