Process for producing polyurethane foams by reaction of the components A polyol component comprising A1 from 40 to 100 parts by weight of polyether carbonate polyol having a hydroxyl number in accordance with DIN 53240-1 of June 2013 of from 20 mg KOH/g to 120 mg KOH/g, A2 from 0 to 60 parts by weight of polyether polyol having a hydroxyl number in accordance with DIN 53240-1 of June 2013 of from 20 mg KOH/g to 250 mg KOH/g and a content of ethylene oxide of from 0 to 60% by weight, with polyether polyol A2 being free of carbonate units, B B1 catalyst, and B2 optionally auxiliaries and additives, C water and/or physical blowing agents, with D diisocyanates and/or polyisocyanates, where the production reaction is carried out at an index of from 90 to 120 and in the presence of a component K, characterized in that the component K is selected from at least one compound of the following formulae (R 1)(R 2)X-C - m -Z [(R 1)(R 2)X-C -N -N -C -R 3 -] 2 [(R 1)(R 2)X-R 3 -C -N -] 2 where m is 0 or 1, X is a hydroxyphenyl group, Y is -N -, -0-, -O-R 4 - or C 1 - to C 6 -alkylene, Z is H, a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group, where Z is not H when Y is -0-, R 1, R 2 are each H, hydroxyl, a substituted or unsubstituted C 1 - to C 6 -alkyl group or-O-R 5, R 3 is a substituted or unsubstituted C 1 - to C 12 -alkylene group, a substituted or unsubstituted C 1 - to C 12 -alkenylene group, R 4 is a substituted or unsubstituted C 1 - to C 6 -alkylene group, R 5 is a substituted or unsubstituted C 1 - to C 12 -alkyl group, and the component K is used in an amount of 0.05 to 10.00 parts by weight, based on the sum of the parts by weight of the components A1 + A2 = 100 parts by weight. A polyol component comprising A1 from 40 to 100 parts by weight of polyether carbonate polyol having a hydroxyl number in accordance with DIN 53240-1 of June 2013 of from 20 mg KOH/g to 120 mg KOH/g, A2 from 0 to 60 parts by weight of polyether polyol having a hydroxyl number in accordance with DIN 53240-1 of June 2013 of from 20 mg KOH/g to 250 mg KOH/g and a content of ethylene oxide of from 0 to 60% by weight, with polyether polyol A2 being free of carbonate units, A1 from 40 to 100 parts by weight of polyether carbonate polyol having a hydroxyl number in accordance with DIN 53240-1 of June 2013 of from 20 mg KOH/g to 120 mg KOH/g, A2 from 0 to 60 parts by weight of polyether polyol having a hydroxyl number in accordance with DIN 53240-1 of June 2013 of from 20 mg KOH/g to 250 mg KOH/g and a content of ethylene oxide of from 0 to 60% by weight, with polyether polyol A2 being free of carbonate units, B B1 catalyst, and B2 optionally auxiliaries and additives, B1 catalyst, and B2 optionally auxiliaries and additives, C water and/or physical blowing agents, with D diisocyanates and/or polyisocyanates, m is 0 or 1, X is a hydroxyphenyl group, Y is -N -, -0-, -O-R 4 - or C 1 - to C 6 -alkylene, Z is H, a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group, where Z is not H when Y is -0-, R 1, R 2 are each H, hydroxyl, a substituted or unsubstituted C 1 - to C 6 -alkyl group or-O-R 5, R 3 is a substituted or unsubstituted C 1 - to C 12 -alkylene group, a substituted or unsubstituted C 1 - to C 12 -alkenylene group, R 4 is a substituted or unsubstituted C 1 - to C 6 -alkylene group, R 5 is a substituted or unsubstituted C 1 - to C 12 -alkyl group, and the component K is used in an amount of 0.05 to 10.00 parts by weight, based on the sum of the parts by weight of the components A1 + A2 = 100 parts by weight.