Process for preparing a polyoxyalkylene polyester polyol having a calculated OH number of 320 mg KOH / g to 530 mg KOH / g, preferably from 350 mg KOH / g to 500 mg KOH / g, by reacting an H-functional starter compound having n mol of alcoholic hydroxy groups and/or aminic protons, preferably having n mol of alcoholic hydroxy groups, and a fatty acid ester having n mol of fatty acid ester groups with an alkylene oxide, optionally in the presence of a basic catalyst and optionally in a solvent, wherein the H-functional starter compound comprises one or more compounds, wherein at least one H-functional starter compound has a melting point of > 50.0°C, preferably of > 55.0°C, determined according to the method DIN EN ISO 11357-1:2016, wherein the fatty acid ester has an OH number of less than 100 mg KOH / g, wherein the proportion of the fatty acid ester is at least 40% by mass based on the total mass of the employed H-functional starter compound, the employed fatty acid ester and the employed alkylene oxide, wherein the process comprises the steps of: (i) providing a system (i) comprising the H-functional starter compound and optionally the basic catalyst optionally in a solvent in a reaction vessel, (ii) adding n mol of a first sub-amount of the alkylene oxide to the system (i) over a period t 1 to form an intermediate (ii), (iii) removing any solvent present from the intermediate (ii) to form an intermediate (iii), (iv) adding the fatty acid ester to the intermediate (ii) or to the intermediate (iii) to form the intermediate (iv), wherein n mol of fatty acid ester groups are supplied to the intermediate (ii) or the intermediate (iii), (v) adding n mol of a second sub-amount of the alkylene oxide to the intermediate (iv) over a period t 2 to form the polyoxyalkylene polyester polyol, wherein (n /n) • t 2 /[h] ≥ 1.0, wherein n /n ≥ 1.05, wherein n /n ≥ 0.43. an H-functional starter compound having n mol of alcoholic hydroxy groups and/or aminic protons, preferably having n mol of alcoholic hydroxy groups, and a fatty acid ester having n mol of fatty acid ester groups with an alkylene oxide, optionally in the presence of a basic catalyst and optionally in a solvent, wherein the H-functional starter compound comprises one or more compounds, wherein at least one H-functional starter compound has a melting point of > 50.0°C, preferably of > 55.0°C, determined according to the method DIN EN ISO 11357-1:2016, wherein the fatty acid ester has an OH number of less than 100 mg KOH / g, wherein the proportion of the fatty acid ester is at least 40% by mass based on the total mass of the employed H-functional starter compound, the employed fatty acid ester and the employed alkylene oxide, wherein the process comprises the steps of: (i) providing a system (i) comprising the H-functional starter compound and optionally the basic catalyst optionally in a solvent in a reaction vessel, (ii) adding n mol of a first sub-amount of the alkylene oxide to the system (i) over a period t 1 to form an intermediate (ii), (iii) removing any solvent present from the intermediate (ii) to form an intermediate (iii), (iv) adding the fatty acid ester to the intermediate (ii) or to the intermediate (iii) to form the intermediate (iv), wherein n mol of fatty acid ester groups are supplied to the intermediate (ii) or the intermediate (iii), (v) adding n mol of a second sub-amount of the alkylene oxide to the intermediate (iv) over a period t 2 to form the polyoxyalkylene polyester polyol, (i) providing a system (i) comprising the H-functional starter compound and optionally the basic catalyst optionally in a solvent in a reaction vessel, (ii) adding n mol of a first sub-amount of the alkylene oxide to the system (i) over a period t 1 to form an intermediate (ii), (iii) removing any solvent present from the intermediate (ii) to form an intermediate (iii), (iv) adding the fatty acid ester to the intermediate (ii) or to the intermediate (iii) to form the intermediate (iv), wherein n mol of fatty acid ester groups are supplied to the intermediate (ii) or the intermediate (iii), (v) adding n mol of a second sub-amount of the alkylene oxide to the intermediate (iv) over a period t 2 to form the polyoxyalkylene polyester polyol, wherein (n /n) • t 2 /[h] ≥ 1.0, wherein n /n ≥ 1.05, wherein n /n ≥ 0.43.