Method for producing estolide esters and composition of estolide esters

A method for preparing a composition C5 of estolide esters, said method comprising:

• a) providing a composition C1 comprising at least one hydroxycarboxylic acid containing from 10 to 30 carbon atoms,
• (b) followed by:
• b1) the introduction of a composition C2 comprising at least one saturated acid containing 2 to 18 carbon atoms, into the composition C1 in order to obtain a composition C3 of acid estolides, the hydroxycarboxylic acid/saturated fatty acid molar ratio being from 1/2 to 1/8, followed by the introduction of a composition C4 comprising at least one saturated alcohol containing 1 to 16 carbon atoms, into the composition C3,
• or
• b2) the introduction of a composition C4 comprising at least one saturated alcohol containing 1 to 16 carbon atoms, into composition C1 in order to obtain a composition C6 of hydroxycarboxylic acid ester, followed by the introduction of a composition C2 comprising at least one saturated acid containing from 2 to 18 carbon atoms, into the composition C6, the molar ratio of hydroxycarboxylic acid ester to saturated fatty acid is from 1/1.4 to 1/6 when the method is carried out according to route b2),
• (c) obtaining a composition C5 of estolide esters,
• wherein said at least one hydroxycarboxylic acid is a saturated acid.