FIELD: polymers. SUBSTANCE: invention describes a method of synthesis of inflexible foam polyurethanes or foam polyisocyanurates modified with urethane. Method involves the stage of interaction of composition based on an organic polyisocyanate with the composition that is reactive to isocyanate and comprising polyesterpolyol having mean amount of functional groups from 1.8 to 8, hydroxyl number from 15 to 750 mg of KOH/g and molecular mass from 400 to 10 000 Da in the presence of amine catalyst taken among the group consisting of 2,2'-dimorpholino- -diethyl ester, 1-methylimidazole, 4-dimethylaminopyuridine and 4-pyrrolidinopyridine. Invention describes the composition that is reactive to isocyanate. EFFECT: improved method of synthesis. 13 cl, 5 tbl
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