Abstract: The invention relates to a process for the production of swellable filaments, fibers and shaped structures of acrylic polymer, by reacting the free carboxyl groups of the filament-forming substance with substances which react in a basic manner, with water being excluded, and to swellable filaments and fibers thus obtained, which, in the dry state, have tensile strengths of more than 10 cN/tex and knot strengths of more than 6 cN/tex and which can be further processed by means of the customary textile machinery.
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