Polyol components and use thereof for the production of rigid polyurethane foams

A polyol component P), comprising:

• a) at least one polyether polyol A) having an OH number in a range of from 300 to 500 mg KOH/g, comprising units based on mixtures having a functionality in a range of from 5.7 to 6.4 of the monomers ai), aii) and aiii), each selected from the groups consisting of ai) sucrose,
• aii) monopropylene glycol, diethylene glycol, triethylene glycol, dipropylene glycol, glycerol and mixtures thereof,
• aiii) solely propylene oxide as alkylene oxide,
• b) at least one polyether polyol B) having an OH number in a range of from 300 to 500 mg KOH/g, comprising units based on mixtures having a functionality in a range of from 3.0 to 5.0 of the monomers bi) and bii), each selected from the groups consisting of bi) 2,3-, 3,4-, 2,4-, 2,5-, 2,6-tolylenediamine and mixtures thereof,
• bii) solely propylene oxide as alkylene oxide,
• c) at least one polyether polyol C) having an OH number in a range of from 100 to 290 mg KOH/g, comprising units based on mixtures having a functionality in a range of from 3.0 to 5.0 or 2.8 to 3.0 of the monomers ci) and cii), each selected from the groups consisting of
• ci) amines comprising ethylenediamine, 1,3-propylenediamine, 1,3-, 1,4-butylenediamine, 1,2-, 1,3-, 1,4-, 1,5-, 1,6-hexamethylenediamine, phenylenediamines, 2,3-, 3,4-, 2,4-, 2,5-, 2,6-tolylenediamine and 4,4′-, 2,4′-, 2,2′-diaminodiphenylmethane or mixtures thereof, polyols comprising glycerol, trimethylolpropane, monopropylene glycol, diethylene glycol, triethylene glycol, dipropylene glycol (2,2′-oxydi-1-propanol, 1,1′-oxydi-2-propanol, 2-(2-hydroxypropoxy)-1-propanol) and mixtures thereof,
• cii) ethylene oxide, propylene oxide, butylene oxide and mixtures thereof as alkylene oxides.