Polyurethane foams comprising a mixture obtained in the production of tolylene diisocyanate (tdi) as bottoms residue

A process for producing polyurethane foams by reacting a component A comprising

• A1 at least one polyether polyol having a functionality of 2 to 8, a polyoxyethylene (EO) content of 0% to 30% by weight, and an OH number according to DIN 53240 of ≥10 mg KOH/g to ≤112 mg KOH/g,
• A2 optionally,. at least one polyether polyol having a functionality of 2 to 8, a polyoxyethylene (EO) content of >60% by weight, and an OH number according to DIN 53240 of ≥10 mg KOH/g to ≤112 mg KOH/g,
• A3 optionally, at least one dispersion of a polymer in a polyether polyol, where the OH number according to DIN 53240 of the dispersion is within a range from 10 to 60 mg KOH/g and wherein the polyether polyol has a hydroxyl functionality of 2 to 6, a polyoxypropylene (PO) content in an amount of 70% to 90% by weight and an EO content in an amount of 10% to 30% by weight;
• A4 water and/or physical blowing agents,
• A5 optionally, compounds having hydrogen atoms that are reactive toward isocyanates, having an OH number of 140 mg KOH/g to 900 mg KOH/g,
• A6 optionally, auxiliaries and additives, preferably at least one component selected from catalysts, surface-active additions, additives, pigments or flame retardants or a combination thereof;
• and a component B comprising
• B1 the distillation product of at least one bottoms residue which is obtained in tolylene diisocyanate (TDI) production, in the last distillation step,
• B2 further di- and/or polyisocyanates,
• wherein the reaction of component A with component B is conducted at an isocyanate index of 75 to 120, and wherein all parts by weight figures for components A1 to A6 are normalized such that the sum total of parts by weight A1+A2+A3 in the composition adds up to 100 parts by weight.