Polyester oil structurants are obtainable by the reaction of a C4 to C10 Q dicarboxylic acid, a polyol and a C16 to C30, particularly a C20 to C24, monocarboxylic fatty acid. The structurants can be used to provide structure, particularly thickening and/or gelling, in oils of a wide range of polarity. Thickened oils can find application in a range of personal care and other applications.本發明係關於一種可由C4至C10二羧酸、多元醇及C16至C30、尤其C20至C24單羧基脂肪酸之反應獲得之聚酯油結構劑。該等結構劑可用於對寬廣範圍極性之油提供結構化,尤其係稠化及/或凝膠化。稠化油可用於個人護理之範圍內之應用及其他應用中。