Ester compounds possessing heat stability in the presence of a metal and prepared from di- to nona- hydric hindered alcohols having 5 to 15 carbon atoms and saturated aliphatic monocarboxylic acids having 3 to 20 carbon atoms or derivatives thereof, characterized in that the proportion of the branched carboxylic acids or derivatives thereof in all the carboxylic acids or derivatives thereof is at least 50 % by mole and the ester compounds have a hydroxyl value of at most 30 mg KOH/g and an acid value after the sealed tube test of at most 10 mg KOH/g: and a lubricating oil composition characterized by containing at least 20 % by weight of the ester compounds. Thus the invention provides ester compounds possessing excellent heat stability in the presence of a metal, and a lubricating oil composition and a hydraulic fluid composition for refrigerators, each composed mainly of the ester compounds.
在
金属存在下具有热稳定性的
酯类化合物,由具有 5 至 15 个碳原子的二
水至非
水受阻醇和具有 3 至 20 个碳原子的饱和脂肪族一元
羧酸或其衍
生物制备、其特征在于支链
羧酸或其衍
生物在所有
羧酸或其衍
生物中所占比例至少为 50%(按摩尔计),且
酯类化合物的羟值不超过 30 毫克 KOH/克,密封管测试后的酸值不超过 10 毫克 KOH/克:以及一种润滑油组合物,其特征是含有至少 20% (按重量计)的
酯类化合物。因此,本发明提供了在
金属存在下具有优异热稳定性的
酯类化合物,以及主要由这些
酯类化合物组成的用于冰箱的润滑油组合物和液压油组合物。