Polyketone moulding compound comprising or consisting of 25 - 99.9% by weight of at least one aliphatic polyketone; 0 - 70% by weight of filling- or reinforcing materials; 0.1 - 6% by weight of at least one phosphorus-containing compound, selected from the group consisting of - 0.1 - 6% by weight of at least one phosphinic acid, of at least one diphosphinic acid, a metal salt of these phosphinic acids and/or an organic derivate thereof (component C1); or - 0.1 - 2% by weight of an organic phosphite or phosphonite (component C2), or - 0.1 - 6% by weight of a mixture of phosphinic acid or diphosphinic acid or a metal salt of these phosphinic acids (component C1) and an organic phosphite or phosphonite (component C2), the mixture consisting of 0.05 - 2% by weight of component C2 and 0.05 - 5.95% by weight of component C1. wherein at least one of the phosphorus-containing compounds and is present in the polyketone moulding compound, so that the sum of the phosphorus-containing compounds and is at least 0.1% by weight, 0 - 20% by weight of at least one additive, wherein the at least one phosphinic acid and also the metal salts derived herefrom have the subsequently illustrated general formula or the at least one diphosphinic acid and the metal salts derived herefrom have the subsequently illustrated general formula wherein R1, R2 are the same or different and preferably are C1-C8 alkyl, linear or branched, saturated, unsaturated or partially unsaturated and/or aryl; R3 is C1-C10 alkylene, linear or branched, saturated, unsaturated or partially unsaturated, C6-C10 arylene, alkylarylene or arylalkylene; M is a hydrogen ion (proton) or a metal ion from the 2 nd or 3 rd main or subsidiary group of the periodic table, preferably aluminium, barium, calcium, magnesium and/or zinc; and m = 2 or 3; n = 1 or 3; x = 1 or 2. the sum of to producing 100% by weight, the amounts for to including and respectively relating to the moulding compound or the sum of to and the moulding compound preferably consisting exclusively of components to. 25 - 99.9% by weight of at least one aliphatic polyketone; 0 - 70% by weight of filling- or reinforcing materials; 0.1 - 6% by weight of at least one phosphorus-containing compound, selected from the group consisting of - 0.1 - 6% by weight of at least one phosphinic acid, of at least one diphosphinic acid, a metal salt of these phosphinic acids and/or an organic derivate thereof (component C1); or - 0.1 - 2% by weight of an organic phosphite or phosphonite (component C2), or - 0.1 - 6% by weight of a mixture of phosphinic acid or diphosphinic acid or a metal salt of these phosphinic acids (component C1) and an organic phosphite or phosphonite (component C2), the mixture consisting of 0.05 - 2% by weight of component C2 and 0.05 - 5.95% by weight of component C1. wherein at least one of the phosphorus-containing compounds and is present in the polyketone moulding compound, so that the sum of the phosphorus-containing compounds and is at least 0.1% by weight, - 0.1 - 6% by weight of at least one phosphinic acid, of at least one diphosphinic acid, a metal salt of these phosphinic acids and/or an organic derivate thereof (component C1); or - 0.1 - 2% by weight of an organic phosphite or phosphonite (component C2), or - 0.1 - 6% by weight of a mixture of phosphinic acid or diphosphinic acid or a metal salt of these phosphinic acids (component C1) and an organic phosphite or phosphonite (component C2), the mixture consisting of 0.05 - 2% by weight of component C2 and 0.05 - 5.95% by weight of component C1. 0 - 20% by weight of at least one additive, R1, R2 are the same or different and preferably are C1-C8 alkyl, linear or branched, saturated, unsaturated or partially unsaturated and/or aryl; R3 is C1-C10 alkylene, linear or branched, saturated, unsaturated or partially unsaturated, C6-C10 arylene, alkylarylene or arylalkylene; M is a hydrogen ion (proton) or a metal ion from the 2 nd or 3 rd main or subsidiary group of the periodic table, preferably aluminium, barium, calcium, magnesium and/or zinc; and m = 2 or 3; n = 1 or 3; x = 1 or 2.