| 摘要 |
The invention relates to a crosslinked polyurethane comprising A) at least one polytetrahydrofuran of the formula B) at least one compound which contains more than 2 active hydrogen atoms per molecule C) at least one compound which contains at least 2 active hydrogen atoms per molecule and at least one ionogenic and/or ionic group per molecule, where the groups may be anionogenic, anionic, cationogenic or cationic D) at least one diisocyanate E) optionally a compound different from B) and C) which contains at least 2 active hydrogen atoms and has a molecular weight of from 60 to 5000 or the salts thereof.
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