Ester mixture comprising at least one ester of an aliphatic or aromatic di- or tricarboxylic acid having a C.sub.10 alcohol component composed of 2-propylheptanol or composed of a C.sub.10 alcohol mixture composed of 2-propylheptanol and of at least one of the C.sub.10 alcohols 2-propyl-4-methylhexanol, 2-propyl-5-methylhexanol, 2-isopropylheptanol, 2-isopropyl-4-methylhexanol, 2-isopropyl-5-methylhexanol, and/or 2-propyl-4,4-dimethylpentanol, and comprising at least one ester of an aliphatic or aromatic di- or tricarboxylic acid having a C.sub.7 alcohol component composed of n-heptanol or composed of an alcohol mixture composed of n-heptanol with at least one of the C.sub.7 alcohols 2-methylhexanol and/or 2-ethylpentanol, where the aliphatic or aromatic di- or tricarboxylic acid has been selected from the group consisting of citric acid, phthalic acid, isophthalic acid, terephthalic acid, and trimellitic acid, and polyvinyl chloride composition comprising this ester mixture.