Additive For Lubricant

摘要

An additive for lubricants exhibiting high oxidation stability, high thermal stability, and high No_x resistance, and having excellent functions as an extreme-pressure additive or wear-resistant agent and a lubricant composition containing the additive are provided The present invention provides an additive for lubricants comprising a phosphate ester derivative represented by the general formula [I]: wherein Y represents sulfur (S) or oxygen (O); R¹ represents a monovalent organic group having 4 to 24 carbon atoms; R² represents a divalent organic group having 1 to 6 carbon atoms; and n represents an integer of 1 to 3. The present invention also provides a lubricant composition containing the derivative.