The present invention relates generally to substantially liquid, chlorine-free, sulfur-bridged phenols useful as antioxidants and more specifically to the preparation of substantially liquid, chlorine-free, sulfur-bridged, hindered phenol compositions which are effective antioxidants in lubricating oils without causing excessive copper corrosion. The invention also includes lubricating oils containing an antioxidant additive of the present invention, as well as a method of reducing oxidation in the lubricating oil used in a machine such as an internal combustion engine.
本发明一般涉及可用作
抗氧化剂的基本液态、不含
氯的
硫桥
酚,更具体地说,涉及基本液态、不含
氯的
硫桥受阻
酚组合物的制备,这种组合物是润滑油中有效的
抗氧化剂,不会造成
铜的过度腐蚀。本发明还包括含有本发明抗氧化添加剂的润滑油,以及减少内燃机等机器所用润滑油氧化的方法。