| http://www.w3.org/ns/prov#value | - The polymer b) produced according to method E to H above can be washed, for example with water and/or methanol, and dried, for example under vacuum at 20??? to 35??? C., preferably at ambient temperature The produced polymer b) is cross-linked with S2 O8 2 -- groups at a molar ratio of cationic groups, such as ammonium, sulfonium or phosphonium groups, to S2 O8 2 -- groups of 2:1.
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