FIELD: preparation of rigid polyurethane foams. SUBSTANCE: preparation of hydroxy-containing polyurethane foams by addition of alkylene oxide to proton-containing compounds in the presence of alkaline catalysts followed by neutralization with acetic acid excess and addition of basic stabilizer, e. g. 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline in amount sufficient to bind acid excess. EFFECT: higher efficiency. 2 cl
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