FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing polyester polyols, use thereof and use of, as well as use of polyurethane (PUR) and polyisocyanurate (PIR) foam which contains polyester polyol, and a metal composite element which contains PUR and PIR foam. The method of producing polyester polyols involves mixing (A) at least one carboxylic anhydride, (B) diethylene glycol, (C) at least one glycol with 2-4 carbon atoms and (D) at least one an aliphatic dicarboxylic acid with 5-12 carbons. The molar ratio of components (B) and (A) is in the range from 1.5:1 to 1.1:1. The weight ratio of components (A) and (B), with respect to the weight of all components in the mixture, is in the range from 66 wt % to 95 wt %.
EFFECT: limiting the amount of dioxane used relative to the amount of diethylene glycol used when producing polyester polyols.
11 cl, 2 tbl, 3 ex
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