| 摘要 |
A process is disclosed for preparation of a lubricating oil additive comprising an improved sulfurized alkaline earth metal alkylphenate and the composition thereof wherein the said composition has a ratio of infrared absorbencies of A1660 cm-1/A1600 cm-1 of less than 0.2 and less than 0.2 for the ratio of A1080 cm-1/A835 cm-1.
|
