| http://www.w3.org/ns/prov#value | - The process according to the invention is therefore preferably carried out in such a manner that the substantially aqueous solution of the water-soluble prepolymer comprising crosslinkable groups is free or substantially free of undesired constituents, such as especially monomeric, oligomeric or polymeric starting compounds used for the preparation of the prepolymer, or secondary products that hav
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