The invention relates to liquid sulphur-containing antioxidants obtainable by reacting at least compound of formula (I) with at least one compound of formula (II) and at least one compound of formula (III) where the variables are as defined in the claims. The invention further relates to compositions comprising them. The novel lubricant compositions comprise the reaction product of a selected group of 5-tert-butyl-4-hydroxy-3-methyl(or tert-butyl)phenyl substituted carboxylic acid esters with thiodiethylene glycol and a mono-hydroxy alcohol with a chain length higher than 4 C-atoms. The novel lubricant compositions are highly resistant to oxidative degradation and are capable of reducing negative effects of deposits, such as black sludge, in motor combustion engines, particularly spark ignition internal combustion engines.
本发明涉及通过将式(I)的至少一种化合物与式(II)的至少一种化合物和式(III)的至少一种化合物反应而得到的含液态
硫的
抗氧化剂。本发明还涉及包含它们的组合物。新型润滑剂组合物包括由选择的一组5-叔丁基-
4-羟基-3-甲基(或叔丁基)苯基取代的
羧酸酯与
硫代
二乙二醇和链长大于4个碳原子的单一羟基醇的反应产物。新型润滑剂组合物高度抗氧化降解,并能够减少沉积物的负面影响,如在发动机燃烧室中的黑色污泥,特别是在火花点火内燃机中。