FIELD: chemistry.;SUBSTANCE: described is a polymerisation catalyst system and a polymerisation method using said catalyst systems. The polymerisation catalyst systems may include a) a first catalytically active compound and b) a second catalytically active compound, the first catalytically active compound including an oxadiazole-containing compound. The oxadiazole-containing compound corresponds to the structural formula given below, wherein M is selected from a group comprising Ti, Zr and Hf; values or radicals from R2 to R10 are given in the claim ; ; ;X is at least one leaving group.;EFFECT: oxadiazole-containing compound substantially has no hydrogen response, which enables improved and/or specific regulation of properties of the product when producing polymers using the described catalyst system.;12 cl, 6 dwg, 7 tbl, 3 ex
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