FIELD: preparation of elastic foam polyurethanes. SUBSTANCE: polyesters are prepared by polycondansation of adipic acid, diethylene glycol and pentaerythritol at their molar ratio of (33.5-35.0):(35-37):1.0-1.3 respectively, in the presence of an organotitanium catalyst. The polycondensation is carried out to form a polyester having a hydroxyl number of 60 ± 3 mg KOH/g and an acid number of not greater than 1.5 mg KOH/g. EFFECT: improved properties of foam polyurethanes.
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