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Viscosity measurements with solutions of butadiene-acrylonitrile copolymers containing microgelMicrogel-containing solutions of butadiene-acrylonitrile copolymers in butanone were studied by viscosimetry. The results were compared with data from light scattering measurements. The found [ql-M, relations are different and strongly dependent on the samples under investigation. Therefore, the evaluation of relative molecular masses from viscosity measurements is questionable when using such solutions.