| abstract |
The crosslinked copolymer with 75 to 99.9% by weight of repeating units of a pyridyl, quinolyl, isoquinolyl or pyrazinyl compound containing a polymerizable olefinic group, 0.1 to 25% by weight of units of a crosslinking agent and 0 to 25% by weight. % Units of a polymerizable silicon and / or boron organic compound and, based on 100% by weight of the sum of the above units, 5 to 350% by weight units of an N-vinyl amide is produced by bead polymerization and is used as a sorbent for acidic substances used their aqueous solutions. |