| http://www.w3.org/ns/prov#value | - In a preferred embodiment of the crosslinking process, an essentially aqueous solution of the prepolymer which is essentially free from undesired constituents, for example free from monomeric, oligomeric or polymeric starting compounds used for the preparation of the prepolymer, and/or free from by-products formed during the preparation of the prepolymer, is prepared in step a) and used further.
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