FIELD: polymer materials. SUBSTANCE: invention provides composition reactive to isocyanate and containing polyesterpolyol with average functionality from 1.8 to 8, hydroxyl number from 15 to 750 mg KOH/g, and molecular weight from 400 to 10000, amine catalyst, and carboxylic acid of formula 
, in which R' represents linear or branched aliphatic hydrocarbon with 1-5 carbon atoms and m is integer 1, 2 or 3. Two methods for production of rigid polyurethane foams or foamed plastic based on polyisocyanurates are proposed. EFFECT: increased stability of polyol mixture and preserved its reactivity for a long time. 11 cl, 4 dwg, 8 tbl, 6 ex
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